#include "png.h"
#if PNG_LIBPNG_VER < 10500
typedef png_byte *png_const_bytep;
#define PNG_INTERLACE_ADAM7_PASSES 7
#define PNG_PASS_START_ROW(pass) (((1U&~(pass))<<(3-((pass)>>1)))&7)
#define PNG_PASS_START_COL(pass) (((1U& (pass))<<(3-(((pass)+1)>>1)))&7)
#define PNG_PASS_ROW_SHIFT(pass) ((pass)>2?(8-(pass))>>1:3)
#define PNG_PASS_COL_SHIFT(pass) ((pass)>1?(7-(pass))>>1:3)
#define PNG_PASS_ROWS(height, pass) (((height)+(((1<<PNG_PASS_ROW_SHIFT(pass))\
-1)-PNG_PASS_START_ROW(pass)))>>PNG_PASS_ROW_SHIFT(pass))
#define PNG_PASS_COLS(width, pass) (((width)+(((1<<PNG_PASS_COL_SHIFT(pass))\
-1)-PNG_PASS_START_COL(pass)))>>PNG_PASS_COL_SHIFT(pass))
#define PNG_ROW_FROM_PASS_ROW(yIn, pass) \
(((yIn)<<PNG_PASS_ROW_SHIFT(pass))+PNG_PASS_START_ROW(pass))
#define PNG_COL_FROM_PASS_COL(xIn, pass) \
(((xIn)<<PNG_PASS_COL_SHIFT(pass))+PNG_PASS_START_COL(pass))
#define PNG_PASS_MASK(pass,off) ( \
((0x110145AFU>>(((7-(off))-(pass))<<2)) & 0xFU) | \
((0x01145AF0U>>(((7-(off))-(pass))<<2)) & 0xF0U))
#define PNG_ROW_IN_INTERLACE_PASS(y, pass) \
((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1)
#define PNG_COL_IN_INTERLACE_PASS(x, pass) \
((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1)
#define PNG_WRITE_16BIT_SUPPORTED
#define PNG_READ_16BIT_SUPPORTED
#endif
#include "zlib.h"
#include <float.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#ifndef UNUSED
# if defined(__GNUC__) || defined(_MSC_VER)
# define UNUSED(param) (void)param;
# else
# define UNUSED(param)
# endif
#endif
#include "contrib/visupng/cexcept.h"
struct png_store;
define_exception_type(struct png_store*);
#define anon_context(ps) struct exception_context *the_exception_context = \
&(ps)->exception_context
#define context(ps,fault) anon_context(ps); png_store *fault
static size_t safecat(char *buffer, size_t bufsize, size_t pos,
PNG_CONST char *cat)
{
while (pos < bufsize && cat != NULL && *cat != 0)
buffer[pos++] = *cat++;
if (pos >= bufsize)
pos = bufsize-1;
buffer[pos] = 0;
return pos;
}
static size_t safecatn(char *buffer, size_t bufsize, size_t pos, int n)
{
char number[64];
sprintf(number, "%d", n);
return safecat(buffer, bufsize, pos, number);
}
static size_t safecatd(char *buffer, size_t bufsize, size_t pos, double d,
int precision)
{
char number[64];
sprintf(number, "%.*f", precision, d);
return safecat(buffer, bufsize, pos, number);
}
static PNG_CONST char invalid[] = "invalid";
static PNG_CONST char sep[] = ": ";
static PNG_CONST char *bit_depths[8] =
{
"1", "2", "4", "8", "16", invalid, invalid, invalid
};
static PNG_CONST char *colour_types[8] =
{
"greyscale", invalid, "truecolour", "indexed-colour",
"greyscale with alpha", invalid, "truecolour with alpha", invalid
};
static unsigned int
log2depth(png_byte bit_depth)
{
switch (bit_depth)
{
case 1:
return 0;
case 2:
return 1;
case 4:
return 2;
case 8:
return 3;
case 16:
return 4;
default:
return 7;
}
}
#define FILEID(col, depth, interlace, width, height, do_interlace) \
((png_uint_32)((col) + ((depth)<<3) + ((interlace)<<8) + \
(((do_interlace)!=0)<<15) + ((width)<<16) + ((height)<<24)))
#define COL_FROM_ID(id) ((png_byte)((id)& 0x7U))
#define DEPTH_FROM_ID(id) ((png_byte)(((id) >> 3) & 0x1fU))
#define INTERLACE_FROM_ID(id) ((int)(((id) >> 8) & 0x3))
#define DO_INTERLACE_FROM_ID(id) ((int)(((id)>>15) & 1))
#define WIDTH_FROM_ID(id) (((id)>>16) & 0xff)
#define HEIGHT_FROM_ID(id) (((id)>>24) & 0xff)
static size_t
standard_name(char *buffer, size_t bufsize, size_t pos, png_byte colour_type,
int log_bit_depth, int interlace_type, png_uint_32 w, png_uint_32 h,
int do_interlace)
{
pos = safecat(buffer, bufsize, pos, colour_types[colour_type]);
pos = safecat(buffer, bufsize, pos, " ");
pos = safecat(buffer, bufsize, pos, bit_depths[log_bit_depth]);
pos = safecat(buffer, bufsize, pos, " bit ");
if (interlace_type != PNG_INTERLACE_NONE)
pos = safecat(buffer, bufsize, pos, "interlaced");
if (do_interlace)
pos = safecat(buffer, bufsize, pos, "(pngvalid)");
else
pos = safecat(buffer, bufsize, pos, "(libpng)");
if (w > 0 || h > 0)
{
pos = safecat(buffer, bufsize, pos, " ");
pos = safecatn(buffer, bufsize, pos, w);
pos = safecat(buffer, bufsize, pos, "x");
pos = safecatn(buffer, bufsize, pos, h);
}
return pos;
}
static size_t
standard_name_from_id(char *buffer, size_t bufsize, size_t pos, png_uint_32 id)
{
return standard_name(buffer, bufsize, pos, COL_FROM_ID(id),
log2depth(DEPTH_FROM_ID(id)), INTERLACE_FROM_ID(id),
WIDTH_FROM_ID(id), HEIGHT_FROM_ID(id), DO_INTERLACE_FROM_ID(id));
}
#ifdef PNG_WRITE_16BIT_SUPPORTED
# define WRITE_BDHI 4
# ifdef PNG_READ_16BIT_SUPPORTED
# define READ_BDHI 4
# define DO_16BIT
# endif
#else
# define WRITE_BDHI 3
#endif
#ifndef DO_16BIT
# define READ_BDHI 3
#endif
static int
next_format(png_bytep colour_type, png_bytep bit_depth)
{
if (*bit_depth == 0)
{
*colour_type = 0, *bit_depth = 1;
return 1;
}
*bit_depth = (png_byte)(*bit_depth << 1);
if (*bit_depth <= 8
# ifdef DO_16BIT
|| (*colour_type != 3 && *bit_depth <= 16)
# endif
)
return 1;
switch (*colour_type)
{
case 0:
*colour_type = 2;
*bit_depth = 8;
return 1;
case 2:
*colour_type = 3;
*bit_depth = 1;
return 1;
case 3:
*colour_type = 4;
*bit_depth = 8;
return 1;
case 4:
*colour_type = 6;
*bit_depth = 8;
return 1;
default:
return 0;
}
}
static unsigned int
sample(png_const_bytep row, png_byte colour_type, png_byte bit_depth,
png_uint_32 x, unsigned int sample_index)
{
png_uint_32 bit_index, result;
x *= bit_depth;
bit_index = x;
if ((colour_type & 1) == 0)
{
if (colour_type & 2)
bit_index *= 3;
if (colour_type & 4)
bit_index += x;
if (colour_type & (2+4))
bit_index += sample_index * bit_depth;
}
row += bit_index >> 3;
result = *row;
if (bit_depth == 8)
return result;
else if (bit_depth > 8)
return (result << 8) + *++row;
bit_index &= 7;
return (result >> (8-bit_index-bit_depth)) & ((1U<<bit_depth)-1);
}
static void
pixel_copy(png_bytep toBuffer, png_uint_32 toIndex,
png_const_bytep fromBuffer, png_uint_32 fromIndex, unsigned int pixelSize)
{
toIndex *= pixelSize;
fromIndex *= pixelSize;
if (pixelSize < 8)
{
unsigned int destMask = ((1U<<pixelSize)-1) << (8-pixelSize-(toIndex&7));
unsigned int destByte = toBuffer[toIndex >> 3] & ~destMask;
unsigned int sourceByte = fromBuffer[fromIndex >> 3];
fromIndex &= 7;
if (fromIndex > 0) sourceByte <<= fromIndex;
if ((toIndex & 7) > 0) sourceByte >>= toIndex & 7;
toBuffer[toIndex >> 3] = (png_byte)(destByte | (sourceByte & destMask));
}
else
memmove(toBuffer+(toIndex>>3), fromBuffer+(fromIndex>>3), pixelSize>>3);
}
static int
pixel_cmp(png_const_bytep pa, png_const_bytep pb, png_uint_32 bit_width)
{
if (memcmp(pa, pb, bit_width>>3) == 0)
{
png_uint_32 p;
if ((bit_width & 7) == 0) return 0;
p = pa[bit_width >> 3];
p ^= pb[bit_width >> 3];
if (p == 0) return 0;
bit_width &= 7;
p >>= 8-bit_width;
if (p == 0) return 0;
}
return 1;
}
#define STORE_BUFFER_SIZE 500
typedef struct png_store_buffer
{
struct png_store_buffer* prev;
png_byte buffer[STORE_BUFFER_SIZE];
} png_store_buffer;
#define FILE_NAME_SIZE 64
typedef struct png_store_file
{
struct png_store_file* next;
char name[FILE_NAME_SIZE];
png_uint_32 id;
png_size_t datacount;
png_store_buffer data;
} png_store_file;
typedef struct store_pool
{
struct png_store *store;
struct store_memory *list;
png_byte mark[4];
png_alloc_size_t max;
png_alloc_size_t current;
png_alloc_size_t limit;
png_alloc_size_t total;
png_alloc_size_t max_max;
png_alloc_size_t max_limit;
png_alloc_size_t max_total;
} store_pool;
typedef struct png_store
{
struct exception_context
exception_context;
unsigned int verbose :1;
unsigned int treat_warnings_as_errors :1;
unsigned int expect_error :1;
unsigned int expect_warning :1;
unsigned int saw_warning :1;
unsigned int speed :1;
unsigned int progressive :1;
unsigned int validated :1;
int nerrors;
int nwarnings;
char test[128];
char error[256];
png_structp pread;
png_infop piread;
png_store_file* current;
png_store_buffer* next;
png_size_t readpos;
png_byte* image;
size_t cb_image;
store_pool read_memory_pool;
png_store_file* saved;
png_structp pwrite;
png_infop piwrite;
png_size_t writepos;
char wname[FILE_NAME_SIZE];
png_store_buffer new;
store_pool write_memory_pool;
} png_store;
static void
store_pool_mark(png_byte *mark)
{
static png_uint_32 u0 = 0x12345678, u1 = 1;
int i;
for (i=0; i<4; ++i)
{
png_uint_32 u = ((u0 >> (20-8)) ^ ((u1 << 7) | (u0 >> (32-7)))) & 0xff;
u1 <<= 8;
u1 |= u0 >> 24;
u0 <<= 8;
u0 |= u;
*mark++ = (png_byte)u;
}
}
static png_uint_32
random_32(void)
{
for(;;)
{
png_byte mark[4];
png_uint_32 result;
store_pool_mark(mark);
result = png_get_uint_32(mark);
if (result != 0)
return result;
}
}
static void
store_pool_init(png_store *ps, store_pool *pool)
{
memset(pool, 0, sizeof *pool);
pool->store = ps;
pool->list = NULL;
pool->max = pool->current = pool->limit = pool->total = 0;
pool->max_max = pool->max_limit = pool->max_total = 0;
store_pool_mark(pool->mark);
}
static void
store_init(png_store* ps)
{
memset(ps, 0, sizeof *ps);
init_exception_context(&ps->exception_context);
store_pool_init(ps, &ps->read_memory_pool);
store_pool_init(ps, &ps->write_memory_pool);
ps->verbose = 0;
ps->treat_warnings_as_errors = 0;
ps->expect_error = 0;
ps->expect_warning = 0;
ps->saw_warning = 0;
ps->speed = 0;
ps->progressive = 0;
ps->validated = 0;
ps->nerrors = ps->nwarnings = 0;
ps->pread = NULL;
ps->piread = NULL;
ps->saved = ps->current = NULL;
ps->next = NULL;
ps->readpos = 0;
ps->image = NULL;
ps->cb_image = 0;
ps->pwrite = NULL;
ps->piwrite = NULL;
ps->writepos = 0;
ps->new.prev = NULL;
}
static void
store_ensure_image(png_store *ps, png_structp pp, size_t cb)
{
if (ps->cb_image < cb)
{
if (ps->image != NULL)
{
free(ps->image-1);
ps->cb_image = 0;
}
ps->image = malloc(cb+1);
if (ps->image == NULL)
png_error(pp, "OOM allocating image buffer");
++(ps->image);
ps->cb_image = cb;
}
memset(ps->image, 0xff, cb);
}
static void
store_freebuffer(png_store_buffer* psb)
{
if (psb->prev)
{
store_freebuffer(psb->prev);
free(psb->prev);
psb->prev = NULL;
}
}
static void
store_freenew(png_store *ps)
{
store_freebuffer(&ps->new);
ps->writepos = 0;
}
static void
store_storenew(png_store *ps)
{
png_store_buffer *pb;
if (ps->writepos != STORE_BUFFER_SIZE)
png_error(ps->pwrite, "invalid store call");
pb = malloc(sizeof *pb);
if (pb == NULL)
png_error(ps->pwrite, "store new: OOM");
*pb = ps->new;
ps->new.prev = pb;
ps->writepos = 0;
}
static void
store_freefile(png_store_file **ppf)
{
if (*ppf != NULL)
{
store_freefile(&(*ppf)->next);
store_freebuffer(&(*ppf)->data);
(*ppf)->datacount = 0;
free(*ppf);
*ppf = NULL;
}
}
static void
store_storefile(png_store *ps, png_uint_32 id)
{
png_store_file *pf = malloc(sizeof *pf);
if (pf == NULL)
png_error(ps->pwrite, "storefile: OOM");
safecat(pf->name, sizeof pf->name, 0, ps->wname);
pf->id = id;
pf->data = ps->new;
pf->datacount = ps->writepos;
ps->new.prev = NULL;
ps->writepos = 0;
pf->next = ps->saved;
ps->saved = pf;
}
static size_t
store_message(png_store *ps, png_structp pp, char *buffer, size_t bufsize,
size_t pos, PNG_CONST char *msg)
{
if (pp != NULL && pp == ps->pread)
{
pos = safecat(buffer, bufsize, pos, "read: ");
if (ps->current != NULL)
{
pos = safecat(buffer, bufsize, pos, ps->current->name);
pos = safecat(buffer, bufsize, pos, sep);
}
}
else if (pp != NULL && pp == ps->pwrite)
{
pos = safecat(buffer, bufsize, pos, "write: ");
pos = safecat(buffer, bufsize, pos, ps->wname);
pos = safecat(buffer, bufsize, pos, sep);
}
else
{
pos = safecat(buffer, bufsize, pos, "pngvalid: ");
}
if (ps->test[0] != 0)
{
pos = safecat(buffer, bufsize, pos, ps->test);
pos = safecat(buffer, bufsize, pos, sep);
}
pos = safecat(buffer, bufsize, pos, msg);
return pos;
}
static void
store_log(png_store* ps, png_structp pp, png_const_charp message, int is_error)
{
if (is_error ? (ps->nerrors)++ == 0 :
(ps->nwarnings)++ == 0 && ps->nerrors == 0)
store_message(ps, pp, ps->error, sizeof ps->error, 0, message);
if (ps->verbose)
{
char buffer[256];
size_t pos;
if (is_error)
pos = safecat(buffer, sizeof buffer, 0, "error: ");
else
pos = safecat(buffer, sizeof buffer, 0, "warning: ");
store_message(ps, pp, buffer, sizeof buffer, pos, message);
fputs(buffer, stderr);
fputc('\n', stderr);
}
}
static void
store_error(png_structp pp, png_const_charp message)
{
png_store *ps = png_get_error_ptr(pp);
if (!ps->expect_error)
store_log(ps, pp, message, 1 );
{
struct exception_context *the_exception_context = &ps->exception_context;
Throw ps;
}
}
static void
store_warning(png_structp pp, png_const_charp message)
{
png_store *ps = png_get_error_ptr(pp);
if (!ps->expect_warning)
store_log(ps, pp, message, 0 );
else
ps->saw_warning = 1;
}
static void
store_write(png_structp pp, png_bytep pb, png_size_t st)
{
png_store *ps = png_get_io_ptr(pp);
if (ps->pwrite != pp)
png_error(pp, "store state damaged");
while (st > 0)
{
size_t cb;
if (ps->writepos >= STORE_BUFFER_SIZE)
store_storenew(ps);
cb = st;
if (cb > STORE_BUFFER_SIZE - ps->writepos)
cb = STORE_BUFFER_SIZE - ps->writepos;
memcpy(ps->new.buffer + ps->writepos, pb, cb);
pb += cb;
st -= cb;
ps->writepos += cb;
}
}
static void
store_flush(png_structp pp)
{
UNUSED(pp)
}
static size_t
store_read_buffer_size(png_store *ps)
{
if (ps->next != &ps->current->data)
return STORE_BUFFER_SIZE;
return ps->current->datacount;
}
static size_t
store_read_buffer_avail(png_store *ps)
{
if (ps->current != NULL && ps->next != NULL)
{
png_store_buffer *next = &ps->current->data;
size_t cbAvail = ps->current->datacount;
while (next != ps->next && next != NULL)
{
next = next->prev;
cbAvail += STORE_BUFFER_SIZE;
}
if (next != ps->next)
png_error(ps->pread, "buffer read error");
if (cbAvail > ps->readpos)
return cbAvail - ps->readpos;
}
return 0;
}
static int
store_read_buffer_next(png_store *ps)
{
png_store_buffer *pbOld = ps->next;
png_store_buffer *pbNew = &ps->current->data;
if (pbOld != pbNew)
{
while (pbNew != NULL && pbNew->prev != pbOld)
pbNew = pbNew->prev;
if (pbNew != NULL)
{
ps->next = pbNew;
ps->readpos = 0;
return 1;
}
png_error(ps->pread, "buffer lost");
}
return 0;
}
static void
store_read_imp(png_store *ps, png_bytep pb, png_size_t st)
{
if (ps->current == NULL || ps->next == NULL)
png_error(ps->pread, "store state damaged");
while (st > 0)
{
size_t cbAvail = store_read_buffer_size(ps) - ps->readpos;
if (cbAvail > 0)
{
if (cbAvail > st) cbAvail = st;
memcpy(pb, ps->next->buffer + ps->readpos, cbAvail);
st -= cbAvail;
pb += cbAvail;
ps->readpos += cbAvail;
}
else if (!store_read_buffer_next(ps))
png_error(ps->pread, "read beyond end of file");
}
}
static void
store_read(png_structp pp, png_bytep pb, png_size_t st)
{
png_store *ps = png_get_io_ptr(pp);
if (ps == NULL || ps->pread != pp)
png_error(pp, "bad store read call");
store_read_imp(ps, pb, st);
}
static void
store_progressive_read(png_store *ps, png_structp pp, png_infop pi)
{
if (ps->pread != pp || ps->current == NULL || ps->next == NULL)
png_error(pp, "store state damaged (progressive)");
do
{
if (ps->readpos != 0)
png_error(pp, "store_read called during progressive read");
png_process_data(pp, pi, ps->next->buffer, store_read_buffer_size(ps));
}
while (store_read_buffer_next(ps));
}
typedef struct store_memory
{
store_pool *pool;
struct store_memory *next;
png_alloc_size_t size;
png_byte mark[4];
} store_memory;
static void
store_pool_error(png_store *ps, png_structp pp, PNG_CONST char *msg)
{
if (pp != NULL)
png_error(pp, msg);
store_log(ps, pp, msg, 1 );
}
static void
store_memory_free(png_structp pp, store_pool *pool, store_memory *memory)
{
if (memory->pool != pool)
store_pool_error(pool->store, pp, "memory corrupted (pool)");
else if (memcmp(memory->mark, pool->mark, sizeof memory->mark) != 0)
store_pool_error(pool->store, pp, "memory corrupted (start)");
else
{
png_alloc_size_t cb = memory->size;
if (cb > pool->max)
store_pool_error(pool->store, pp, "memory corrupted (size)");
else if (memcmp((png_bytep)(memory+1)+cb, pool->mark, sizeof pool->mark)
!= 0)
store_pool_error(pool->store, pp, "memory corrupted (end)");
else
{
pool->current -= cb;
free(memory);
}
}
}
static void
store_pool_delete(png_store *ps, store_pool *pool)
{
if (pool->list != NULL)
{
fprintf(stderr, "%s: %s %s: memory lost (list follows):\n", ps->test,
pool == &ps->read_memory_pool ? "read" : "write",
pool == &ps->read_memory_pool ? (ps->current != NULL ?
ps->current->name : "unknown file") : ps->wname);
++ps->nerrors;
do
{
store_memory *next = pool->list;
pool->list = next->next;
next->next = NULL;
fprintf(stderr, "\t%lu bytes @ %p\n",
(unsigned long)next->size, next+1);
store_memory_free(NULL, pool, next);
}
while (pool->list != NULL);
}
if (pool->max > pool->max_max) pool->max_max = pool->max;
pool->max = 0;
if (pool->current != 0)
fprintf(stderr, "%s: %s %s: memory counter mismatch (internal error)\n",
ps->test, pool == &ps->read_memory_pool ? "read" : "write",
pool == &ps->read_memory_pool ? (ps->current != NULL ?
ps->current->name : "unknown file") : ps->wname);
pool->current = 0;
if (pool->limit > pool->max_limit)
pool->max_limit = pool->limit;
pool->limit = 0;
if (pool->total > pool->max_total)
pool->max_total = pool->total;
pool->total = 0;
store_pool_mark(pool->mark);
}
static png_voidp
store_malloc(png_structp pp, png_alloc_size_t cb)
{
store_pool *pool = png_get_mem_ptr(pp);
store_memory *new = malloc(cb + (sizeof *new) + (sizeof pool->mark));
if (new != NULL)
{
if (cb > pool->max)
pool->max = cb;
pool->current += cb;
if (pool->current > pool->limit)
pool->limit = pool->current;
pool->total += cb;
new->size = cb;
memcpy(new->mark, pool->mark, sizeof new->mark);
memcpy((png_byte*)(new+1) + cb, pool->mark, sizeof pool->mark);
new->pool = pool;
new->next = pool->list;
pool->list = new;
++new;
}
else
store_pool_error(pool->store, pp, "out of memory");
return new;
}
static void
store_free(png_structp pp, png_voidp memory)
{
store_pool *pool = png_get_mem_ptr(pp);
store_memory *this = memory, **test;
--this;
for (test = &pool->list; *test != this; test = &(*test)->next)
{
if (*test == NULL)
{
store_pool_error(pool->store, pp, "bad pointer to free");
return;
}
}
*test = this->next;
this->next = NULL;
store_memory_free(pp, pool, this);
}
static void
store_write_reset(png_store *ps)
{
if (ps->pwrite != NULL)
{
anon_context(ps);
Try
png_destroy_write_struct(&ps->pwrite, &ps->piwrite);
Catch_anonymous
{
}
ps->pwrite = NULL;
ps->piwrite = NULL;
}
store_pool_delete(ps, &ps->write_memory_pool);
store_freenew(ps);
}
static png_structp
set_store_for_write(png_store *ps, png_infopp ppi,
PNG_CONST char * volatile name)
{
anon_context(ps);
Try
{
if (ps->pwrite != NULL)
png_error(ps->pwrite, "write store already in use");
store_write_reset(ps);
safecat(ps->wname, sizeof ps->wname, 0, name);
if (ps->speed)
ps->pwrite = png_create_write_struct(PNG_LIBPNG_VER_STRING,
ps, store_error, store_warning);
else
ps->pwrite = png_create_write_struct_2(PNG_LIBPNG_VER_STRING,
ps, store_error, store_warning, &ps->write_memory_pool,
store_malloc, store_free);
png_set_write_fn(ps->pwrite, ps, store_write, store_flush);
if (ppi != NULL)
*ppi = ps->piwrite = png_create_info_struct(ps->pwrite);
}
Catch_anonymous
return NULL;
return ps->pwrite;
}
static void
store_read_reset(png_store *ps)
{
if (ps->pread != NULL)
{
anon_context(ps);
Try
png_destroy_read_struct(&ps->pread, &ps->piread, NULL);
Catch_anonymous
{
}
ps->pread = NULL;
ps->piread = NULL;
}
store_pool_delete(ps, &ps->read_memory_pool);
ps->current = NULL;
ps->next = NULL;
ps->readpos = 0;
ps->validated = 0;
}
static void
store_read_set(png_store *ps, png_uint_32 id)
{
png_store_file *pf = ps->saved;
while (pf != NULL)
{
if (pf->id == id)
{
ps->current = pf;
ps->next = NULL;
store_read_buffer_next(ps);
return;
}
pf = pf->next;
}
{
size_t pos;
char msg[FILE_NAME_SIZE+64];
pos = standard_name_from_id(msg, sizeof msg, 0, id);
pos = safecat(msg, sizeof msg, pos, ": file not found");
png_error(ps->pread, msg);
}
}
static png_structp
set_store_for_read(png_store *ps, png_infopp ppi, png_uint_32 id,
PNG_CONST char *name)
{
safecat(ps->test, sizeof ps->test, 0, name);
if (ps->pread != NULL)
png_error(ps->pread, "read store already in use");
store_read_reset(ps);
if (ps->speed)
ps->pread = png_create_read_struct(PNG_LIBPNG_VER_STRING, ps,
store_error, store_warning);
else
ps->pread = png_create_read_struct_2(PNG_LIBPNG_VER_STRING, ps,
store_error, store_warning, &ps->read_memory_pool, store_malloc,
store_free);
if (ps->pread == NULL)
{
struct exception_context *the_exception_context = &ps->exception_context;
store_log(ps, NULL, "png_create_read_struct returned NULL (unexpected)",
1 );
Throw ps;
}
store_read_set(ps, id);
if (ppi != NULL)
*ppi = ps->piread = png_create_info_struct(ps->pread);
return ps->pread;
}
static void
store_delete(png_store *ps)
{
store_write_reset(ps);
store_read_reset(ps);
store_freefile(&ps->saved);
if (ps->image != NULL)
{
free(ps->image-1);
ps->image = NULL;
ps->cb_image = 0;
}
}
typedef struct png_modifier
{
png_store this;
struct png_modification *modifications;
enum modifier_state
{
modifier_start,
modifier_signature,
modifier_IHDR
} state;
png_byte bit_depth;
png_byte colour_type;
png_uint_32 pending_len;
png_uint_32 pending_chunk;
double *gammas;
unsigned int ngammas;
png_byte sbitlow;
double maxout8;
double maxabs8;
double maxpc8;
double maxout16;
double maxabs16;
double maxpc16;
double error_gray_2;
double error_gray_4;
double error_gray_8;
double error_gray_16;
double error_color_8;
double error_color_16;
int interlace_type :9;
unsigned int test_standard :1;
unsigned int test_size :1;
unsigned int test_transform :1;
unsigned int use_input_precision :1;
unsigned int use_input_precision_sbit :1;
unsigned int use_input_precision_16to8 :1;
unsigned int test_gamma_threshold :1;
unsigned int test_gamma_transform :1;
unsigned int test_gamma_sbit :1;
unsigned int test_gamma_strip16 :1;
unsigned int log :1;
size_t flush;
size_t buffer_count;
size_t buffer_position;
png_byte buffer[1024];
} png_modifier;
static double abserr(png_modifier *pm, png_byte bit_depth)
{
return bit_depth == 16 ? pm->maxabs16 : pm->maxabs8;
}
static double pcerr(png_modifier *pm, png_byte bit_depth)
{
return (bit_depth == 16 ? pm->maxpc16 : pm->maxpc8) * .01;
}
static double outerr(png_modifier *pm, png_byte bit_depth)
{
if (bit_depth == 2)
return .73182-.5;
if (bit_depth == 4)
return .90644-.5;
if (bit_depth == 16)
return pm->maxout16;
return pm->maxout8;
}
static int fail(png_modifier *pm)
{
return !pm->log && !pm->this.verbose && (pm->this.nerrors > 0 ||
(pm->this.treat_warnings_as_errors && pm->this.nwarnings > 0));
}
static void
modifier_init(png_modifier *pm)
{
memset(pm, 0, sizeof *pm);
store_init(&pm->this);
pm->modifications = NULL;
pm->state = modifier_start;
pm->sbitlow = 1U;
pm->maxout8 = pm->maxpc8 = pm->maxabs8 = 0;
pm->maxout16 = pm->maxpc16 = pm->maxabs16 = 0;
pm->error_gray_2 = pm->error_gray_4 = pm->error_gray_8 = 0;
pm->error_gray_16 = pm->error_color_8 = pm->error_color_16 = 0;
pm->interlace_type = PNG_INTERLACE_NONE;
pm->test_standard = 0;
pm->test_size = 0;
pm->test_transform = 0;
pm->use_input_precision = 0;
pm->use_input_precision_sbit = 0;
pm->use_input_precision_16to8 = 0;
pm->test_gamma_threshold = 0;
pm->test_gamma_transform = 0;
pm->test_gamma_sbit = 0;
pm->test_gamma_strip16 = 0;
pm->log = 0;
}
typedef struct png_modification
{
struct png_modification *next;
png_uint_32 chunk;
int (*modify_fn)(struct png_modifier *pm,
struct png_modification *me, int add);
png_uint_32 add;
unsigned int modified :1;
unsigned int added :1;
unsigned int removed :1;
} png_modification;
static void modification_reset(png_modification *pmm)
{
if (pmm != NULL)
{
pmm->modified = 0;
pmm->added = 0;
pmm->removed = 0;
modification_reset(pmm->next);
}
}
static void
modification_init(png_modification *pmm)
{
memset(pmm, 0, sizeof *pmm);
pmm->next = NULL;
pmm->chunk = 0;
pmm->modify_fn = NULL;
pmm->add = 0;
modification_reset(pmm);
}
static void
modifier_reset(png_modifier *pm)
{
store_read_reset(&pm->this);
pm->modifications = NULL;
pm->state = modifier_start;
pm->bit_depth = pm->colour_type = 0;
pm->pending_len = pm->pending_chunk = 0;
pm->flush = pm->buffer_count = pm->buffer_position = 0;
}
#define CHUNK(a,b,c,d) (((a)<<24)+((b)<<16)+((c)<<8)+(d))
#define CHUNK_IHDR CHUNK(73,72,68,82)
#define CHUNK_PLTE CHUNK(80,76,84,69)
#define CHUNK_IDAT CHUNK(73,68,65,84)
#define CHUNK_IEND CHUNK(73,69,78,68)
#define CHUNK_cHRM CHUNK(99,72,82,77)
#define CHUNK_gAMA CHUNK(103,65,77,65)
#define CHUNK_sBIT CHUNK(115,66,73,84)
#define CHUNK_sRGB CHUNK(115,82,71,66)
static void
modifier_crc(png_bytep buffer)
{
uInt datalen = png_get_uint_32(buffer);
png_save_uint_32(buffer+datalen+8, crc32(0L, buffer+4, datalen+4));
}
static void
modifier_setbuffer(png_modifier *pm)
{
modifier_crc(pm->buffer);
pm->buffer_count = png_get_uint_32(pm->buffer)+12;
pm->buffer_position = 0;
}
static void
modifier_read_imp(png_modifier *pm, png_bytep pb, png_size_t st)
{
while (st > 0)
{
size_t cb;
png_uint_32 len, chunk;
png_modification *mod;
if (pm->buffer_position >= pm->buffer_count) switch (pm->state)
{
static png_byte sign[8] = { 137, 80, 78, 71, 13, 10, 26, 10 };
case modifier_start:
store_read_imp(&pm->this, pm->buffer, 8);
pm->buffer_count = 8;
pm->buffer_position = 0;
if (memcmp(pm->buffer, sign, 8) != 0)
png_error(pm->this.pread, "invalid PNG file signature");
pm->state = modifier_signature;
break;
case modifier_signature:
store_read_imp(&pm->this, pm->buffer, 13+12);
pm->buffer_count = 13+12;
pm->buffer_position = 0;
if (png_get_uint_32(pm->buffer) != 13 ||
png_get_uint_32(pm->buffer+4) != CHUNK_IHDR)
png_error(pm->this.pread, "invalid IHDR");
mod = pm->modifications;
while (mod != NULL)
{
if (mod->chunk == CHUNK_IHDR && mod->modify_fn &&
(*mod->modify_fn)(pm, mod, 0))
{
mod->modified = 1;
modifier_setbuffer(pm);
}
mod = mod->next;
}
pm->bit_depth = pm->buffer[8+8];
pm->colour_type = pm->buffer[8+8+1];
pm->state = modifier_IHDR;
pm->flush = 0;
break;
case modifier_IHDR:
default:
if ((cb = pm->flush) > 0)
{
if (cb > st) cb = st;
pm->flush -= cb;
store_read_imp(&pm->this, pb, cb);
pb += cb;
st -= cb;
if (st <= 0) return;
}
if (pm->pending_chunk != 0)
{
png_save_uint_32(pm->buffer, pm->pending_len);
png_save_uint_32(pm->buffer+4, pm->pending_chunk);
pm->pending_len = 0;
pm->pending_chunk = 0;
}
else
store_read_imp(&pm->this, pm->buffer, 8);
pm->buffer_count = 8;
pm->buffer_position = 0;
len = png_get_uint_32(pm->buffer);
chunk = png_get_uint_32(pm->buffer+4);
if (chunk == CHUNK_PLTE || chunk == CHUNK_IDAT ||
chunk == CHUNK_IEND)
{
mod = pm->modifications;
while (mod != NULL)
{
if ((mod->add == chunk ||
(mod->add == CHUNK_PLTE && chunk == CHUNK_IDAT)) &&
mod->modify_fn != NULL && !mod->modified && !mod->added)
{
mod->added = 1;
if ((*mod->modify_fn)(pm, mod, 1 ))
{
if (pm->buffer_count > 0)
modifier_setbuffer(pm);
else
{
pm->buffer_position = 0;
mod->removed = 1;
}
pm->pending_len = len;
pm->pending_chunk = chunk;
break;
}
}
mod = mod->next;
}
if (mod != NULL)
break;
}
if (len+12 <= sizeof pm->buffer)
{
store_read_imp(&pm->this, pm->buffer+pm->buffer_count,
len+12-pm->buffer_count);
pm->buffer_count = len+12;
mod = pm->modifications;
while (mod != NULL)
{
if (mod->chunk == chunk)
{
if (mod->modify_fn == NULL)
{
pm->buffer_count = pm->buffer_position = 0;
mod->removed = 1;
break;
}
else if ((*mod->modify_fn)(pm, mod, 0))
{
mod->modified = 1;
if (pm->buffer_count == 0)
{
pm->buffer_position = 0;
break;
}
modifier_setbuffer(pm);
}
}
mod = mod->next;
}
}
else
pm->flush = len+12 - pm->buffer_count;
break;
}
cb = pm->buffer_count - pm->buffer_position;
if (cb > st)
cb = st;
memcpy(pb, pm->buffer + pm->buffer_position, cb);
st -= cb;
pb += cb;
pm->buffer_position += cb;
}
}
static void
modifier_read(png_structp pp, png_bytep pb, png_size_t st)
{
png_modifier *pm = png_get_io_ptr(pp);
if (pm == NULL || pm->this.pread != pp)
png_error(pp, "bad modifier_read call");
modifier_read_imp(pm, pb, st);
}
static void
modifier_progressive_read(png_modifier *pm, png_structp pp, png_infop pi)
{
if (pm->this.pread != pp || pm->this.current == NULL ||
pm->this.next == NULL)
png_error(pp, "store state damaged (progressive)");
for (;;)
{
static png_uint_32 noise = 1;
png_size_t cb, cbAvail;
png_byte buffer[512];
noise = (noise << 9) | ((noise ^ (noise >> (9-5))) & 0x1ff);
cb = noise & 0x1ff;
cbAvail = store_read_buffer_avail(&pm->this);
if (pm->buffer_count > pm->buffer_position)
cbAvail += pm->buffer_count - pm->buffer_position;
if (cb > cbAvail)
{
if (cbAvail == 0)
break;
cb = cbAvail;
}
modifier_read_imp(pm, buffer, cb);
png_process_data(pp, pi, buffer, cb);
}
if (pm->buffer_count > pm->buffer_position ||
pm->this.next != &pm->this.current->data ||
pm->this.readpos < pm->this.current->datacount)
png_error(pp, "progressive read implementation error");
}
static png_structp
set_modifier_for_read(png_modifier *pm, png_infopp ppi, png_uint_32 id,
PNG_CONST char *name)
{
pm->state = modifier_start;
pm->bit_depth = 0;
pm->colour_type = 255;
pm->pending_len = 0;
pm->pending_chunk = 0;
pm->flush = 0;
pm->buffer_count = 0;
pm->buffer_position = 0;
return set_store_for_read(&pm->this, ppi, id, name);
}
static int
npasses_from_interlace_type(png_structp pp, int interlace_type)
{
switch (interlace_type)
{
default:
png_error(pp, "invalid interlace type");
case PNG_INTERLACE_NONE:
return 1;
case PNG_INTERLACE_ADAM7:
return PNG_INTERLACE_ADAM7_PASSES;
}
}
static unsigned int
bit_size(png_structp pp, png_byte colour_type, png_byte bit_depth)
{
switch (colour_type)
{
case 0: return bit_depth;
case 2: return 3*bit_depth;
case 3: return bit_depth;
case 4: return 2*bit_depth;
case 6: return 4*bit_depth;
default: png_error(pp, "invalid color type");
}
}
#define TRANSFORM_WIDTH 128U
#define TRANSFORM_ROWMAX (TRANSFORM_WIDTH*8U)
#define SIZE_ROWMAX (16*8U)
#define STANDARD_ROWMAX TRANSFORM_ROWMAX
#define TRANSFORM_IMAGEMAX (TRANSFORM_ROWMAX * (png_uint_32)2048)
#define SIZE_IMAGEMAX (SIZE_ROWMAX * 16U)
static size_t
transform_rowsize(png_structp pp, png_byte colour_type, png_byte bit_depth)
{
return (TRANSFORM_WIDTH * bit_size(pp, colour_type, bit_depth)) / 8;
}
#define transform_width(pp, colour_type, bit_depth) TRANSFORM_WIDTH
static png_uint_32
transform_height(png_structp pp, png_byte colour_type, png_byte bit_depth)
{
switch (bit_size(pp, colour_type, bit_depth))
{
case 1:
case 2:
case 4:
return 1;
case 8:
return 2;
case 16:
return 512;
case 24:
case 32:
return 512;
case 48:
case 64:
return 2048;
default:
return 0;
}
}
static png_uint_32
standard_width(png_structp pp, png_uint_32 id)
{
png_uint_32 width = WIDTH_FROM_ID(id);
UNUSED(pp)
if (width == 0)
width = transform_width(pp, COL_FROM_ID(id), DEPTH_FROM_ID(id));
return width;
}
static png_uint_32
standard_height(png_structp pp, png_uint_32 id)
{
png_uint_32 height = HEIGHT_FROM_ID(id);
if (height == 0)
height = transform_height(pp, COL_FROM_ID(id), DEPTH_FROM_ID(id));
return height;
}
static png_uint_32
standard_rowsize(png_structp pp, png_uint_32 id)
{
png_uint_32 width = standard_width(pp, id);
width *= bit_size(pp, COL_FROM_ID(id), DEPTH_FROM_ID(id));
return (width + 7) / 8;
}
static void
transform_row(png_structp pp, png_byte buffer[TRANSFORM_ROWMAX],
png_byte colour_type, png_byte bit_depth, png_uint_32 y)
{
png_uint_32 v = y << 7;
png_uint_32 i = 0;
switch (bit_size(pp, colour_type, bit_depth))
{
case 1:
while (i<128/8) buffer[i] = v & 0xff, v += 17, ++i;
return;
case 2:
while (i<128/4) buffer[i] = v & 0xff, v += 33, ++i;
return;
case 4:
while (i<128/2) buffer[i] = v & 0xff, v += 65, ++i;
return;
case 8:
while (i<128) buffer[i] = v & 0xff, ++v, ++i;
return;
case 16:
while (i<128)
buffer[2*i] = (v>>8) & 0xff, buffer[2*i+1] = v & 0xff, ++v, ++i;
return;
case 24:
while (i<128)
{
buffer[3*i+0] = (v >> 8) & 0xff;
buffer[3*i+1] = v & 0xff;
buffer[3*i+2] = ((v >> 8) ^ v) & 0xff;
++v;
++i;
}
return;
case 32:
while (i<128)
{
buffer[4*i+0] = (v >> 8) & 0xff;
buffer[4*i+1] = v & 0xff;
buffer[4*i+2] = (v >> 8) & 0xff;
buffer[4*i+3] = v & 0xff;
++v;
++i;
}
return;
case 48:
while (i<128)
{
png_uint_32 t = v++;
buffer[6*i+0] = (t >> 8) & 0xff;
buffer[6*i+1] = t & 0xff;
t *= 257;
buffer[6*i+2] = (t >> 8) & 0xff;
buffer[6*i+3] = t & 0xff;
t *= 17;
buffer[6*i+4] = (t >> 8) & 0xff;
buffer[6*i+5] = t & 0xff;
++i;
}
return;
case 64:
while (i<128)
{
png_uint_32 t = v++;
buffer[8*i+0] = (t >> 8) & 0xff;
buffer[8*i+1] = t & 0xff;
buffer[8*i+4] = (t >> 8) & 0xff;
buffer[8*i+5] = t & 0xff;
t *= 257;
buffer[8*i+2] = (t >> 8) & 0xff;
buffer[8*i+3] = t & 0xff;
buffer[8*i+6] = (t >> 8) & 0xff;
buffer[8*i+7] = t & 0xff;
++i;
}
return;
default:
break;
}
png_error(pp, "internal error");
}
#define DEPTH(bd) ((png_byte)(1U << (bd)))
static void
make_transform_image(png_store* PNG_CONST ps, png_byte PNG_CONST colour_type,
png_byte PNG_CONST bit_depth, int interlace_type, png_const_charp name)
{
context(ps, fault);
Try
{
png_infop pi;
png_structp pp = set_store_for_write(ps, &pi, name);
png_uint_32 h;
if (pp == NULL)
Throw ps;
h = transform_height(pp, colour_type, bit_depth);
png_set_IHDR(pp, pi, transform_width(pp, colour_type, bit_depth), h,
bit_depth, colour_type, interlace_type,
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
if (colour_type == 3)
{
unsigned int i = 0;
png_color pal[256];
do
pal[i].red = pal[i].green = pal[i].blue = (png_byte)i;
while(++i < 256U);
png_set_PLTE(pp, pi, pal, 256);
}
png_write_info(pp, pi);
if (png_get_rowbytes(pp, pi) !=
transform_rowsize(pp, colour_type, bit_depth))
png_error(pp, "row size incorrect");
else
{
int npasses = png_set_interlace_handling(pp);
int pass;
if (npasses != npasses_from_interlace_type(pp, interlace_type))
png_error(pp, "write: png_set_interlace_handling failed");
for (pass=0; pass<npasses; ++pass)
{
png_uint_32 y;
for (y=0; y<h; ++y)
{
png_byte buffer[TRANSFORM_ROWMAX];
transform_row(pp, buffer, colour_type, bit_depth, y);
png_write_row(pp, buffer);
}
}
}
png_write_end(pp, pi);
store_storefile(ps, FILEID(colour_type, bit_depth, interlace_type,
0, 0, 0));
store_write_reset(ps);
}
Catch(fault)
{
store_write_reset(fault);
}
}
static void
make_standard(png_store* PNG_CONST ps, png_byte PNG_CONST colour_type, int bdlo,
int PNG_CONST bdhi)
{
for (; bdlo <= bdhi; ++bdlo)
{
int interlace_type;
for (interlace_type = PNG_INTERLACE_NONE;
interlace_type < PNG_INTERLACE_LAST; ++interlace_type)
{
char name[FILE_NAME_SIZE];
standard_name(name, sizeof name, 0, colour_type, bdlo, interlace_type,
0, 0, 0);
make_transform_image(ps, colour_type, DEPTH(bdlo), interlace_type,
name);
}
}
}
static void
make_transform_images(png_store *ps)
{
safecat(ps->test, sizeof ps->test, 0, "make standard images");
make_standard(ps, 0, 0, WRITE_BDHI);
make_standard(ps, 2, 3, WRITE_BDHI);
make_standard(ps, 3, 0, 3 );
make_standard(ps, 4, 3, WRITE_BDHI);
make_standard(ps, 6, 3, WRITE_BDHI);
}
static void
interlace_row(png_bytep buffer, png_const_bytep imageRow,
unsigned int pixel_size, png_uint_32 w, int pass)
{
png_uint_32 xin, xout, xstep;
xin = PNG_PASS_START_COL(pass);
xstep = 1U<<PNG_PASS_COL_SHIFT(pass);
for (xout=0; xin<w; xin+=xstep)
{
pixel_copy(buffer, xout, imageRow, xin, pixel_size);
++xout;
}
}
static void
deinterlace_row(png_bytep buffer, png_const_bytep row,
unsigned int pixel_size, png_uint_32 w, int pass)
{
png_uint_32 xin, xout, xstep;
xout = PNG_PASS_START_COL(pass);
xstep = 1U<<PNG_PASS_COL_SHIFT(pass);
for (xin=0; xout<w; xout+=xstep)
{
pixel_copy(buffer, xout, row, xin, pixel_size);
++xin;
}
}
static void
size_row(png_byte buffer[SIZE_ROWMAX], png_uint_32 bit_width, png_uint_32 y)
{
y = ((y & 1) << 7) + ((y & 2) << 6) + ((y & 4) << 5) + ((y & 8) << 4);
y ^= 0xA5;
while (bit_width >= 8)
*buffer++ = (png_byte)y++, bit_width -= 8;
if (bit_width > 0)
{
png_uint_32 mask = (1U<<(8-bit_width))-1;
*buffer = (png_byte)((*buffer & mask) | (y & ~mask));
}
}
static void
make_size_image(png_store* PNG_CONST ps, png_byte PNG_CONST colour_type,
png_byte PNG_CONST bit_depth, int PNG_CONST interlace_type,
png_uint_32 PNG_CONST w, png_uint_32 PNG_CONST h,
int PNG_CONST do_interlace)
{
context(ps, fault);
Try
{
png_infop pi;
png_structp pp;
unsigned int pixel_size;
char name[FILE_NAME_SIZE];
PNG_CONST png_uint_32 id = FILEID(colour_type, bit_depth, interlace_type,
w, h, do_interlace);
standard_name_from_id(name, sizeof name, 0, id);
pp = set_store_for_write(ps, &pi, name);
if (pp == NULL)
Throw ps;
png_set_IHDR(pp, pi, w, h, bit_depth, colour_type, interlace_type,
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
if (colour_type == 3)
{
unsigned int i = 0;
png_color pal[256];
do
pal[i].red = pal[i].green = pal[i].blue = (png_byte)i;
while(++i < 256U);
png_set_PLTE(pp, pi, pal, 256);
}
png_write_info(pp, pi);
pixel_size = bit_size(pp, colour_type, bit_depth);
if (png_get_rowbytes(pp, pi) != ((w * pixel_size) + 7) / 8)
png_error(pp, "row size incorrect");
else
{
int npasses = npasses_from_interlace_type(pp, interlace_type);
png_uint_32 y;
int pass;
png_byte image[16][SIZE_ROWMAX];
memset(image, 0xff, sizeof image);
if (!do_interlace && npasses != png_set_interlace_handling(pp))
png_error(pp, "write: png_set_interlace_handling failed");
for (y=0; y<h; ++y)
size_row(image[y], w * pixel_size, y);
for (pass=0; pass<npasses; ++pass)
{
PNG_CONST png_uint_32 wPass = PNG_PASS_COLS(w, pass);
for (y=0; y<h; ++y)
{
png_const_bytep row = image[y];
png_byte tempRow[SIZE_ROWMAX];
if (do_interlace && interlace_type == PNG_INTERLACE_ADAM7)
{
if (PNG_ROW_IN_INTERLACE_PASS(y, pass) && wPass > 0)
{
memset(tempRow, 0xff, sizeof tempRow);
interlace_row(tempRow, row, pixel_size, w, pass);
row = tempRow;
}
else
continue;
}
png_write_row(pp, row);
}
}
}
png_write_end(pp, pi);
store_storefile(ps, id);
store_write_reset(ps);
}
Catch(fault)
{
store_write_reset(fault);
}
}
static void
make_size(png_store* PNG_CONST ps, png_byte PNG_CONST colour_type, int bdlo,
int PNG_CONST bdhi)
{
for (; bdlo <= bdhi; ++bdlo)
{
png_uint_32 width;
for (width = 1; width <= 16; ++width)
{
png_uint_32 height;
for (height = 1; height <= 16; ++height)
{
make_size_image(ps, colour_type, DEPTH(bdlo), PNG_INTERLACE_NONE,
width, height, 0);
make_size_image(ps, colour_type, DEPTH(bdlo), PNG_INTERLACE_NONE,
width, height, 1);
make_size_image(ps, colour_type, DEPTH(bdlo), PNG_INTERLACE_ADAM7,
width, height, 0);
make_size_image(ps, colour_type, DEPTH(bdlo), PNG_INTERLACE_ADAM7,
width, height, 1);
}
}
}
}
static void
make_size_images(png_store *ps)
{
safecat(ps->test, sizeof ps->test, 0, "make size images");
make_size(ps, 0, 0, WRITE_BDHI);
make_size(ps, 2, 3, WRITE_BDHI);
make_size(ps, 3, 0, 3 );
make_size(ps, 4, 3, WRITE_BDHI);
make_size(ps, 6, 3, WRITE_BDHI);
}
static void
standard_row(png_structp pp, png_byte std[STANDARD_ROWMAX], png_uint_32 id,
png_uint_32 y)
{
if (WIDTH_FROM_ID(id) == 0)
transform_row(pp, std, COL_FROM_ID(id), DEPTH_FROM_ID(id), y);
else
size_row(std, WIDTH_FROM_ID(id) * bit_size(pp, COL_FROM_ID(id),
DEPTH_FROM_ID(id)), y);
}
static void
sBIT0_error_fn(png_structp pp, png_infop pi)
{
png_color_8 bad;
bad.red = bad.green = bad.blue = bad.gray = bad.alpha = 0;
png_set_sBIT(pp, pi, &bad);
}
static void
sBIT_error_fn(png_structp pp, png_infop pi)
{
png_byte bit_depth;
png_color_8 bad;
if (png_get_color_type(pp, pi) == PNG_COLOR_TYPE_PALETTE)
bit_depth = 8;
else
bit_depth = png_get_bit_depth(pp, pi);
bad.red = bad.green = bad.blue = bad.gray = bad.alpha =
(png_byte)(bit_depth+1);
png_set_sBIT(pp, pi, &bad);
}
static PNG_CONST struct
{
void (*fn)(png_structp, png_infop);
PNG_CONST char *msg;
unsigned int warning :1;
} error_test[] =
{
{ sBIT0_error_fn, "sBIT(0): failed to detect error", 1 },
{ sBIT_error_fn, "sBIT(too big): failed to detect error", 1 },
};
static void
make_error(png_store* volatile ps, png_byte PNG_CONST colour_type,
png_byte bit_depth, int interlace_type, int test, png_const_charp name)
{
context(ps, fault);
Try
{
png_structp pp;
png_infop pi;
pp = set_store_for_write(ps, &pi, name);
if (pp == NULL)
Throw ps;
png_set_IHDR(pp, pi, transform_width(pp, colour_type, bit_depth),
transform_height(pp, colour_type, bit_depth), bit_depth, colour_type,
interlace_type, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
if (colour_type == 3)
{
unsigned int i = 0;
png_color pal[256];
do
pal[i].red = pal[i].green = pal[i].blue = (png_byte)i;
while(++i < 256U);
png_set_PLTE(pp, pi, pal, 256);
}
# define exception__prev exception_prev_1
# define exception__env exception_env_1
Try
{
ps->expect_error = !error_test[test].warning;
ps->expect_warning = error_test[test].warning;
ps->saw_warning = 0;
error_test[test].fn(pp, pi);
png_write_info(pp, pi);
if (ps->expect_warning && ps->saw_warning)
Throw ps;
store_log(ps, pp, error_test[test].msg, 1 );
}
Catch (fault)
ps = fault;
#undef exception__prev
#undef exception__env
ps->expect_error = 0;
ps->expect_warning = 0;
if (png_get_rowbytes(pp, pi) !=
transform_rowsize(pp, colour_type, bit_depth))
png_error(pp, "row size incorrect");
else
{
png_uint_32 h = transform_height(pp, colour_type, bit_depth);
int npasses = png_set_interlace_handling(pp);
int pass;
if (npasses != npasses_from_interlace_type(pp, interlace_type))
png_error(pp, "write: png_set_interlace_handling failed");
for (pass=0; pass<npasses; ++pass)
{
png_uint_32 y;
for (y=0; y<h; ++y)
{
png_byte buffer[TRANSFORM_ROWMAX];
transform_row(pp, buffer, colour_type, bit_depth, y);
png_write_row(pp, buffer);
}
}
}
png_write_end(pp, pi);
store_write_reset(ps);
}
Catch(fault)
{
store_write_reset(fault);
}
}
static int
make_errors(png_modifier* PNG_CONST pm, png_byte PNG_CONST colour_type,
int bdlo, int PNG_CONST bdhi)
{
for (; bdlo <= bdhi; ++bdlo)
{
int interlace_type;
for (interlace_type = PNG_INTERLACE_NONE;
interlace_type < PNG_INTERLACE_LAST; ++interlace_type)
{
unsigned int test;
char name[FILE_NAME_SIZE];
standard_name(name, sizeof name, 0, colour_type, bdlo, interlace_type,
0, 0, 0);
for (test=0; test<(sizeof error_test)/(sizeof error_test[0]); ++test)
{
make_error(&pm->this, colour_type, DEPTH(bdlo), interlace_type,
test, name);
if (fail(pm))
return 0;
}
}
}
return 1;
}
static void
perform_error_test(png_modifier *pm)
{
safecat(pm->this.test, sizeof pm->this.test, 0, "error test");
if (!make_errors(pm, 0, 0, WRITE_BDHI))
return;
if (!make_errors(pm, 2, 3, WRITE_BDHI))
return;
if (!make_errors(pm, 3, 0, 3))
return;
if (!make_errors(pm, 4, 3, WRITE_BDHI))
return;
if (!make_errors(pm, 6, 3, WRITE_BDHI))
return;
}
typedef struct standard_palette_entry
{
png_byte red;
png_byte green;
png_byte blue;
png_byte alpha;
} standard_palette[256];
typedef struct standard_display
{
png_store* ps;
png_byte colour_type;
png_byte bit_depth;
png_byte red_sBIT;
png_byte green_sBIT;
png_byte blue_sBIT;
png_byte alpha_sBIT;
int interlace_type;
png_uint_32 id;
png_uint_32 w;
png_uint_32 h;
int npasses;
png_uint_32 pixel_size;
png_uint_32 bit_width;
size_t cbRow;
int do_interlace;
int is_transparent;
struct
{
png_uint_16 red;
png_uint_16 green;
png_uint_16 blue;
} transparent;
standard_palette
palette;
} standard_display;
static void
standard_display_init(standard_display *dp, png_store* ps, png_uint_32 id,
int do_interlace)
{
dp->ps = ps;
dp->colour_type = COL_FROM_ID(id);
dp->bit_depth = DEPTH_FROM_ID(id);
dp->alpha_sBIT = dp->blue_sBIT = dp->green_sBIT = dp->alpha_sBIT =
dp->bit_depth;
dp->interlace_type = INTERLACE_FROM_ID(id);
dp->id = id;
dp->w = 0;
dp->h = 0;
dp->npasses = 0;
dp->pixel_size = 0;
dp->bit_width = 0;
dp->cbRow = 0;
dp->do_interlace = do_interlace;
dp->is_transparent = 0;
memset(&dp->transparent, 0, sizeof dp->transparent);
memset(dp->palette, 0xff, sizeof dp->palette);
}
static int
standard_palette_init(standard_palette palette, png_structp pp, png_infop pi)
{
png_colorp pal;
png_bytep trans_alpha;
int num;
pal = 0;
num = -1;
if (png_get_PLTE(pp, pi, &pal, &num) & PNG_INFO_PLTE)
{
int i;
for (i=0; i<num; ++i)
{
palette[i].red = pal[i].red;
palette[i].green = pal[i].green;
palette[i].blue = pal[i].blue;
}
for (; i<256; ++i)
palette[i].red = palette[i].green = palette[i].blue = 126;
}
else
png_error(pp, "validate: missing PLTE with color type 3");
trans_alpha = 0;
num = -1;
if (png_get_tRNS(pp, pi, &trans_alpha, &num, 0) & PNG_INFO_tRNS)
{
int i;
if (trans_alpha == 0 || num <= 0 || num > 256)
png_error(pp, "validate: unexpected png_get_tRNS (palette) result");
for (i=0; i<num; ++i)
palette[i].alpha = trans_alpha[i];
for (; i<256; ++i)
palette[i].alpha = 255;
return 1;
}
else
{
int i;
for (i=0; i<256; ++i)
palette[i].alpha = 255;
return 0;
}
}
static void
standard_info_part1(standard_display *dp, png_structp pp, png_infop pi)
{
if (png_get_bit_depth(pp, pi) != dp->bit_depth)
png_error(pp, "validate: bit depth changed");
if (png_get_color_type(pp, pi) != dp->colour_type)
png_error(pp, "validate: color type changed");
if (png_get_filter_type(pp, pi) != PNG_FILTER_TYPE_BASE)
png_error(pp, "validate: filter type changed");
if (png_get_interlace_type(pp, pi) != dp->interlace_type)
png_error(pp, "validate: interlacing changed");
if (png_get_compression_type(pp, pi) != PNG_COMPRESSION_TYPE_BASE)
png_error(pp, "validate: compression type changed");
dp->w = png_get_image_width(pp, pi);
if (dp->w != standard_width(pp, dp->id))
png_error(pp, "validate: image width changed");
dp->h = png_get_image_height(pp, pi);
if (dp->h != standard_height(pp, dp->id))
png_error(pp, "validate: image height changed");
{
png_color_8p sBIT = 0;
if (png_get_sBIT(pp, pi, &sBIT) & PNG_INFO_sBIT)
{
int sBIT_invalid = 0;
if (sBIT == 0)
png_error(pp, "validate: unexpected png_get_sBIT result");
if (dp->colour_type & PNG_COLOR_MASK_COLOR)
{
if (sBIT->red == 0 || sBIT->red > dp->bit_depth)
sBIT_invalid = 1;
else
dp->red_sBIT = sBIT->red;
if (sBIT->green == 0 || sBIT->green > dp->bit_depth)
sBIT_invalid = 1;
else
dp->green_sBIT = sBIT->green;
if (sBIT->blue == 0 || sBIT->blue > dp->bit_depth)
sBIT_invalid = 1;
else
dp->blue_sBIT = sBIT->blue;
}
else
{
if (sBIT->gray == 0 || sBIT->gray > dp->bit_depth)
sBIT_invalid = 1;
else
dp->blue_sBIT = dp->green_sBIT = dp->red_sBIT = sBIT->gray;
}
if (dp->colour_type & PNG_COLOR_MASK_ALPHA)
{
if (sBIT->alpha == 0 || sBIT->alpha > dp->bit_depth)
sBIT_invalid = 1;
else
dp->alpha_sBIT = sBIT->alpha;
}
if (sBIT_invalid)
png_error(pp, "validate: sBIT value out of range");
}
}
if (png_get_rowbytes(pp, pi) != standard_rowsize(pp, dp->id))
png_error(pp, "validate: row size changed");
if (dp->colour_type == 3)
{
int i;
dp->is_transparent = standard_palette_init(dp->palette, pp, pi);
for (i=0; i<256; ++i)
if (dp->palette[i].red != i || dp->palette[i].green != i ||
dp->palette[i].blue != i)
png_error(pp, "validate: color type 3 PLTE chunk changed");
}
{
png_color_16p trans_color = 0;
if (png_get_tRNS(pp, pi, 0, 0, &trans_color) & PNG_INFO_tRNS)
{
if (trans_color == 0)
png_error(pp, "validate: unexpected png_get_tRNS (color) result");
switch (dp->colour_type)
{
case 0:
dp->transparent.red = dp->transparent.green = dp->transparent.blue =
trans_color->gray;
dp->is_transparent = 1;
break;
case 2:
dp->transparent.red = trans_color->red;
dp->transparent.green = trans_color->green;
dp->transparent.blue = trans_color->blue;
dp->is_transparent = 1;
break;
case 3:
png_error(pp, "validate: unexpected png_get_tRNS result");
break;
default:
png_error(pp, "validate: invalid tRNS chunk with alpha image");
}
}
}
dp->npasses = npasses_from_interlace_type(pp, dp->interlace_type);
if (!dp->do_interlace && dp->npasses != png_set_interlace_handling(pp))
png_error(pp, "validate: file changed interlace type");
}
static void
standard_info_part2(standard_display *dp, png_structp pp, png_infop pi,
int nImages)
{
dp->pixel_size = bit_size(pp, png_get_color_type(pp, pi),
png_get_bit_depth(pp, pi));
dp->bit_width = png_get_image_width(pp, pi) * dp->pixel_size;
dp->cbRow = png_get_rowbytes(pp, pi);
if (dp->cbRow != (dp->bit_width+7)/8)
png_error(pp, "bad png_get_rowbytes calculation");
store_ensure_image(dp->ps, pp, nImages * dp->cbRow * dp->h);
}
static void
standard_info_imp(standard_display *dp, png_structp pp, png_infop pi,
int nImages)
{
standard_info_part1(dp, pp, pi);
png_start_read_image(pp);
standard_info_part2(dp, pp, pi, nImages);
}
static void
standard_info(png_structp pp, png_infop pi)
{
standard_display *dp = png_get_progressive_ptr(pp);
standard_info_imp(dp, pp, pi, 1 );
}
static void
progressive_row(png_structp pp, png_bytep new_row, png_uint_32 y, int pass)
{
PNG_CONST standard_display *dp = png_get_progressive_ptr(pp);
if (new_row != NULL)
{
png_bytep row;
if (dp->do_interlace && dp->interlace_type == PNG_INTERLACE_ADAM7)
y = PNG_ROW_FROM_PASS_ROW(y, pass);
if (y >= dp->h)
png_error(pp, "invalid y to progressive row callback");
row = dp->ps->image + y * dp->cbRow;
if (dp->do_interlace)
{
if (dp->interlace_type == PNG_INTERLACE_ADAM7)
deinterlace_row(row, new_row, dp->pixel_size, dp->w, pass);
else
memcpy(row, new_row, dp->cbRow);
}
else
png_progressive_combine_row(pp, row, new_row);
} else if (dp->interlace_type == PNG_INTERLACE_ADAM7 &&
PNG_ROW_IN_INTERLACE_PASS(y, pass) &&
PNG_PASS_COLS(dp->w, pass) > 0)
png_error(pp, "missing row in progressive de-interlacing");
}
static void
sequential_row(standard_display *dp, png_structp pp, png_infop pi,
PNG_CONST png_bytep pImage, PNG_CONST png_bytep pDisplay)
{
PNG_CONST int npasses = dp->npasses;
PNG_CONST int do_interlace = dp->do_interlace &&
dp->interlace_type == PNG_INTERLACE_ADAM7;
PNG_CONST png_uint_32 height = standard_height(pp, dp->id);
PNG_CONST png_uint_32 width = standard_width(pp, dp->id);
PNG_CONST size_t cbRow = dp->cbRow;
int pass;
for (pass=0; pass<npasses; ++pass)
{
png_uint_32 y;
png_uint_32 wPass = PNG_PASS_COLS(width, pass);
png_bytep pRow1 = pImage;
png_bytep pRow2 = pDisplay;
for (y=0; y<height; ++y)
{
if (do_interlace)
{
if (wPass > 0 && PNG_ROW_IN_INTERLACE_PASS(y, pass))
{
png_byte row[STANDARD_ROWMAX], display[STANDARD_ROWMAX];
memset(row, 0xff, sizeof row);
memset(display, 0, sizeof display);
png_read_row(pp, row, display);
if (pRow1 != NULL)
deinterlace_row(pRow1, row, dp->pixel_size, dp->w, pass);
if (pRow2 != NULL)
deinterlace_row(pRow2, display, dp->pixel_size, dp->w, pass);
}
}
else
png_read_row(pp, pRow1, pRow2);
if (pRow1 != NULL)
pRow1 += cbRow;
if (pRow2 != NULL)
pRow2 += cbRow;
}
}
png_read_end(pp, pi);
}
static void
standard_row_validate(standard_display *dp, png_structp pp, png_const_bytep row,
png_const_bytep display, png_uint_32 y)
{
png_byte std[STANDARD_ROWMAX];
memset(std, 0xff, sizeof std);
standard_row(pp, std, dp->id, y);
if (row != NULL && pixel_cmp(std, row, dp->bit_width) != 0)
{
char msg[64];
sprintf(msg, "PNG image row %d changed", y);
png_error(pp, msg);
}
if (display != NULL && pixel_cmp(std, display, dp->bit_width) != 0)
{
char msg[64];
sprintf(msg, "display row %d changed", y);
png_error(pp, msg);
}
}
static void
standard_image_validate(standard_display *dp, png_structp pp,
png_const_bytep pImage, png_const_bytep pDisplay)
{
png_uint_32 y;
for (y=0; y<dp->h; ++y)
{
standard_row_validate(dp, pp, pImage, pDisplay, y);
if (pImage != NULL)
pImage += dp->cbRow;
if (pDisplay != NULL)
pDisplay += dp->cbRow;
}
dp->ps->validated = 1;
}
static void
standard_end(png_structp pp, png_infop pi)
{
standard_display *dp = png_get_progressive_ptr(pp);
UNUSED(pi)
standard_image_validate(dp, pp, dp->ps->image, NULL);
}
static void
standard_test(png_store* PNG_CONST psIn, png_uint_32 PNG_CONST id,
int do_interlace)
{
standard_display d;
context(psIn, fault);
standard_display_init(&d, psIn, id, do_interlace);
Try
{
png_structp pp;
png_infop pi;
pp = set_store_for_read(d.ps, &pi, d.id,
d.do_interlace ? (d.ps->progressive ?
"pngvalid progressive deinterlacer" :
"pngvalid sequential deinterlacer") : (d.ps->progressive ?
"progressive reader" : "sequential reader"));
if (d.ps->progressive)
{
png_set_progressive_read_fn(pp, &d, standard_info, progressive_row,
standard_end);
store_progressive_read(d.ps, pp, pi);
}
else
{
png_set_read_fn(pp, d.ps, store_read);
png_read_info(pp, pi);
standard_info_imp(&d, pp, pi, 2 );
{
PNG_CONST png_bytep pImage = d.ps->image;
PNG_CONST png_bytep pDisplay = pImage + d.cbRow * d.h;
sequential_row(&d, pp, pi, pImage, pDisplay);
standard_image_validate(&d, pp, pImage, pDisplay);
}
}
if (!d.ps->validated)
png_error(pp, "image read failed silently");
}
Catch(fault)
d.ps = fault;
store_read_reset(d.ps);
}
static int
test_standard(png_modifier* PNG_CONST pm, png_byte PNG_CONST colour_type,
int bdlo, int PNG_CONST bdhi)
{
for (; bdlo <= bdhi; ++bdlo)
{
int interlace_type;
for (interlace_type = PNG_INTERLACE_NONE;
interlace_type < PNG_INTERLACE_LAST; ++interlace_type)
{
standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo),
interlace_type, 0, 0, 0), 0);
if (fail(pm))
return 0;
}
}
return 1;
}
static void
perform_standard_test(png_modifier *pm)
{
if (!test_standard(pm, 0, 0, READ_BDHI))
return;
if (!test_standard(pm, 2, 3, READ_BDHI))
return;
if (!test_standard(pm, 3, 0, 3))
return;
if (!test_standard(pm, 4, 3, READ_BDHI))
return;
if (!test_standard(pm, 6, 3, READ_BDHI))
return;
}
static int
test_size(png_modifier* PNG_CONST pm, png_byte PNG_CONST colour_type,
int bdlo, int PNG_CONST bdhi)
{
static PNG_CONST png_byte hinc[] = {1, 3, 11, 1, 5};
static PNG_CONST png_byte winc[] = {1, 9, 5, 7, 1};
for (; bdlo <= bdhi; ++bdlo)
{
png_uint_32 h, w;
for (h=1; h<=16; h+=hinc[bdlo]) for (w=1; w<=16; w+=winc[bdlo])
{
standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo),
PNG_INTERLACE_NONE, w, h, 0), 0);
if (fail(pm))
return 0;
standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo),
PNG_INTERLACE_NONE, w, h, 1), 0);
if (fail(pm))
return 0;
standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo),
PNG_INTERLACE_ADAM7, w, h, 0), 0);
if (fail(pm))
return 0;
standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo),
PNG_INTERLACE_ADAM7, w, h, 1), 0);
if (fail(pm))
return 0;
standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo),
PNG_INTERLACE_NONE, w, h, 0), 1);
if (fail(pm))
return 0;
standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo),
PNG_INTERLACE_ADAM7, w, h, 0), 1);
if (fail(pm))
return 0;
}
}
return 1;
}
static void
perform_size_test(png_modifier *pm)
{
if (!test_size(pm, 0, 0, READ_BDHI))
return;
if (!test_size(pm, 2, 3, READ_BDHI))
return;
#if 0
if (!test_size(pm, 3, 0, 3))
return;
#endif
if (!test_size(pm, 4, 3, READ_BDHI))
return;
if (!test_size(pm, 6, 3, READ_BDHI))
return;
}
typedef struct image_pixel
{
unsigned int red, green, blue, alpha;
unsigned int palette_index;
png_byte colour_type;
png_byte bit_depth;
png_byte sample_depth;
int have_tRNS;
double redf, greenf, bluef, alphaf;
double rede, greene, bluee, alphae;
png_byte red_sBIT, green_sBIT, blue_sBIT, alpha_sBIT;
} image_pixel;
static void
image_pixel_setf(image_pixel *this, unsigned int max)
{
this->redf = this->red / (double)max;
this->greenf = this->green / (double)max;
this->bluef = this->blue / (double)max;
this->alphaf = this->alpha / (double)max;
if (this->red < max)
this->rede = this->redf * DBL_EPSILON;
else
this->rede = 0;
if (this->green < max)
this->greene = this->greenf * DBL_EPSILON;
else
this->greene = 0;
if (this->blue < max)
this->bluee = this->bluef * DBL_EPSILON;
else
this->bluee = 0;
if (this->alpha < max)
this->alphae = this->alphaf * DBL_EPSILON;
else
this->alphae = 0;
}
static void
image_pixel_init(image_pixel *this, png_const_bytep row, png_byte colour_type,
png_byte bit_depth, png_uint_32 x, standard_palette palette)
{
PNG_CONST png_byte sample_depth = (png_byte)(colour_type ==
PNG_COLOR_TYPE_PALETTE ? 8 : bit_depth);
PNG_CONST unsigned int max = (1U<<sample_depth)-1;
this->palette_index = this->red = this->green = this->blue =
sample(row, colour_type, bit_depth, x, 0);
this->alpha = max;
this->red_sBIT = this->green_sBIT = this->blue_sBIT = this->alpha_sBIT =
sample_depth;
if (colour_type == 3)
{
if (palette != 0)
{
PNG_CONST unsigned int i = this->palette_index;
this->red = palette[i].red;
this->green = palette[i].green;
this->blue = palette[i].blue;
this->alpha = palette[i].alpha;
}
}
else
{
unsigned int i = 0;
if (colour_type & 2)
{
this->green = sample(row, colour_type, bit_depth, x, 1);
this->blue = sample(row, colour_type, bit_depth, x, 2);
i = 2;
}
if (colour_type & 4)
this->alpha = sample(row, colour_type, bit_depth, x, ++i);
}
image_pixel_setf(this, max);
this->colour_type = colour_type;
this->bit_depth = bit_depth;
this->sample_depth = sample_depth;
this->have_tRNS = 0;
}
static void
image_pixel_convert_PLTE(image_pixel *this, const standard_display *display)
{
if (this->colour_type == PNG_COLOR_TYPE_PALETTE)
{
PNG_CONST unsigned int i = this->palette_index;
this->bit_depth = this->sample_depth;
this->red = display->palette[i].red;
this->green = display->palette[i].green;
this->blue = display->palette[i].blue;
this->red_sBIT = display->red_sBIT;
this->green_sBIT = display->green_sBIT;
this->blue_sBIT = display->blue_sBIT;
if (this->have_tRNS)
{
this->alpha = display->palette[i].alpha;
this->colour_type = PNG_COLOR_TYPE_RGB_ALPHA;
this->have_tRNS = 0;
}
else
{
this->alpha = 255;
this->colour_type = PNG_COLOR_TYPE_RGB;
}
this->alpha_sBIT = 8;
image_pixel_setf(this, 255);
}
}
static void
image_pixel_add_alpha(image_pixel *this, const standard_display *display)
{
if (this->colour_type == PNG_COLOR_TYPE_PALETTE)
image_pixel_convert_PLTE(this, display);
if ((this->colour_type & PNG_COLOR_MASK_ALPHA) == 0)
{
if (this->colour_type == PNG_COLOR_TYPE_GRAY)
{
if (this->bit_depth < 8)
this->bit_depth = 8;
if (this->have_tRNS)
{
this->have_tRNS = 0;
if (this->red == display->transparent.red)
this->alphaf = 0;
else
this->alphaf = 1;
}
else
this->alphaf = 1;
this->colour_type = PNG_COLOR_TYPE_GRAY_ALPHA;
}
else if (this->colour_type == PNG_COLOR_TYPE_RGB)
{
if (this->have_tRNS)
{
this->have_tRNS = 0;
if (this->red == display->transparent.red &&
this->green == display->transparent.green &&
this->blue == display->transparent.blue)
this->alphaf = 0;
else
this->alphaf = 1;
this->colour_type = PNG_COLOR_TYPE_RGB_ALPHA;
}
}
this->alphae = 0;
this->alpha_sBIT = display->alpha_sBIT;
}
}
struct transform_display;
typedef struct image_transform
{
PNG_CONST char *name;
int enable;
struct image_transform *PNG_CONST list;
unsigned int global_use;
unsigned int local_use;
PNG_CONST struct image_transform *next;
void (*set)(PNG_CONST struct image_transform *this,
struct transform_display *that, png_structp pp, png_infop pi);
void (*mod)(PNG_CONST struct image_transform *this, image_pixel *that,
png_structp pp, PNG_CONST struct transform_display *display);
int (*add)(struct image_transform *this,
PNG_CONST struct image_transform **that, png_byte colour_type,
png_byte bit_depth);
} image_transform;
typedef struct transform_display
{
standard_display this;
png_modifier* pm;
PNG_CONST image_transform* transform_list;
png_byte output_colour_type;
png_byte output_bit_depth;
} transform_display;
static void
image_transform_set_end(PNG_CONST image_transform *this,
transform_display *that, png_structp pp, png_infop pi)
{
UNUSED(this)
UNUSED(that)
UNUSED(pp)
UNUSED(pi)
}
static unsigned int
sample_scale(double sample_value, unsigned int scale)
{
sample_value = floor(sample_value * scale + .5);
if (!(sample_value > 0))
sample_value = 0;
else if (sample_value > scale)
sample_value = scale;
return (unsigned int)sample_value;
}
static void
image_transform_mod_end(PNG_CONST image_transform *this, image_pixel *that,
png_structp pp, PNG_CONST transform_display *display)
{
PNG_CONST unsigned int scale = (1U<<that->sample_depth)-1;
UNUSED(this)
UNUSED(pp)
UNUSED(display)
that->red = sample_scale(that->redf, scale);
that->rede += 1./(2*((1U<<that->red_sBIT)-1));
if (that->colour_type & PNG_COLOR_MASK_COLOR)
{
that->green = sample_scale(that->greenf, scale);
that->blue = sample_scale(that->bluef, scale);
that->greene += 1./(2*((1U<<that->green_sBIT)-1));
that->bluee += 1./(2*((1U<<that->blue_sBIT)-1));
}
else
{
that->blue = that->green = that->red;
that->bluef = that->greenf = that->redf;
that->bluee = that->greene = that->rede;
}
if ((that->colour_type & PNG_COLOR_MASK_ALPHA) ||
that->colour_type == PNG_COLOR_TYPE_PALETTE)
{
that->alpha = sample_scale(that->alphaf, scale);
that->alphae += 1./(2*((1U<<that->alpha_sBIT)-1));
}
else
{
that->alpha = scale;
that->alpha = 1;
that->alphae = 0;
}
}
static image_transform image_transform_end =
{
"(end)",
1,
0,
0,
0,
0,
image_transform_set_end,
image_transform_mod_end,
0
};
static void
transform_display_init(transform_display *dp, png_modifier *pm, png_uint_32 id,
PNG_CONST image_transform *transform_list)
{
standard_display_init(&dp->this, &pm->this, id, 0);
dp->pm = pm;
dp->transform_list = transform_list;
dp->output_colour_type = 255;
dp->output_bit_depth = 255;
}
static void
transform_info_imp(transform_display *dp, png_structp pp, png_infop pi)
{
standard_info_part1(&dp->this, pp, pi);
dp->transform_list->set(dp->transform_list, dp, pp, pi);
png_read_update_info(pp, pi);
standard_info_part2(&dp->this, pp, pi, 1);
dp->output_colour_type = png_get_color_type(pp, pi);
dp->output_bit_depth = png_get_bit_depth(pp, pi);
switch (dp->output_colour_type)
{
case PNG_COLOR_TYPE_PALETTE:
if (dp->output_bit_depth > 8) goto error;
case PNG_COLOR_TYPE_GRAY:
if (dp->output_bit_depth == 1 || dp->output_bit_depth == 2 ||
dp->output_bit_depth == 4)
break;
default:
if (dp->output_bit_depth == 8 || dp->output_bit_depth == 16)
break;
error:
{
char message[128];
size_t pos;
pos = safecat(message, sizeof message, 0,
"invalid final bit depth: colour type(");
pos = safecatn(message, sizeof message, pos, dp->output_colour_type);
pos = safecat(message, sizeof message, pos, ") with bit depth: ");
pos = safecatn(message, sizeof message, pos, dp->output_bit_depth);
png_error(pp, message);
}
}
{
image_pixel test_pixel;
memset(&test_pixel, 0, sizeof test_pixel);
test_pixel.colour_type = dp->this.colour_type;
test_pixel.bit_depth = dp->this.bit_depth;
if (test_pixel.colour_type == PNG_COLOR_TYPE_PALETTE)
test_pixel.sample_depth = 8;
else
test_pixel.sample_depth = test_pixel.bit_depth;
test_pixel.have_tRNS = dp->this.is_transparent;
dp->transform_list->mod(dp->transform_list, &test_pixel, pp, dp);
if (test_pixel.colour_type != dp->output_colour_type)
{
char message[128];
size_t pos = safecat(message, sizeof message, 0, "colour type ");
pos = safecatn(message, sizeof message, pos, dp->output_colour_type);
pos = safecat(message, sizeof message, pos, " expected ");
pos = safecatn(message, sizeof message, pos, test_pixel.colour_type);
png_error(pp, message);
}
if (test_pixel.bit_depth != dp->output_bit_depth)
{
char message[128];
size_t pos = safecat(message, sizeof message, 0, "bit depth ");
pos = safecatn(message, sizeof message, pos, dp->output_bit_depth);
pos = safecat(message, sizeof message, pos, " expected ");
pos = safecatn(message, sizeof message, pos, test_pixel.bit_depth);
png_error(pp, message);
}
if (test_pixel.colour_type == PNG_COLOR_TYPE_PALETTE)
{
if (test_pixel.sample_depth != 8)
png_error(pp, "pngvalid: internal: palette sample depth not 8");
}
else if (test_pixel.sample_depth != dp->output_bit_depth)
{
char message[128];
size_t pos = safecat(message, sizeof message, 0,
"internal: sample depth ");
pos = safecatn(message, sizeof message, pos, dp->output_bit_depth);
pos = safecat(message, sizeof message, pos, " expected ");
pos = safecatn(message, sizeof message, pos, test_pixel.sample_depth);
png_error(pp, message);
}
}
}
static void
transform_info(png_structp pp, png_infop pi)
{
transform_info_imp(png_get_progressive_ptr(pp), pp, pi);
}
static void
transform_range_check(png_structp pp, unsigned int r, unsigned int g,
unsigned int b, unsigned int a, unsigned int in_digitized, double in,
unsigned int out, png_byte sample_depth, double err, PNG_CONST char *name)
{
unsigned int max = (1U<<sample_depth)-1;
double in_min = ceil((in-err)*max - .5);
double in_max = floor((in+err)*max + .5);
if (!(out >= in_min && out <= in_max))
{
char message[256];
size_t pos;
pos = safecat(message, sizeof message, 0, name);
pos = safecat(message, sizeof message, pos, " output value error: rgba(");
pos = safecatn(message, sizeof message, pos, r);
pos = safecat(message, sizeof message, pos, ",");
pos = safecatn(message, sizeof message, pos, g);
pos = safecat(message, sizeof message, pos, ",");
pos = safecatn(message, sizeof message, pos, b);
pos = safecat(message, sizeof message, pos, ",");
pos = safecatn(message, sizeof message, pos, a);
pos = safecat(message, sizeof message, pos, "): ");
pos = safecatn(message, sizeof message, pos, out);
pos = safecat(message, sizeof message, pos, " expected: ");
pos = safecatn(message, sizeof message, pos, in_digitized);
pos = safecat(message, sizeof message, pos, " (");
pos = safecatd(message, sizeof message, pos, (in-err)*max, 3);
pos = safecat(message, sizeof message, pos, "..");
pos = safecatd(message, sizeof message, pos, (in+err)*max, 3);
pos = safecat(message, sizeof message, pos, ")");
png_error(pp, message);
}
}
static void
transform_image_validate(transform_display *dp, png_structp pp, png_infop pi,
png_const_bytep pRow)
{
PNG_CONST png_byte in_ct = dp->this.colour_type;
PNG_CONST png_byte in_bd = dp->this.bit_depth;
PNG_CONST png_uint_32 w = dp->this.w;
PNG_CONST png_uint_32 h = dp->this.h;
PNG_CONST size_t cbRow = dp->this.cbRow;
PNG_CONST png_byte out_ct = dp->output_colour_type;
PNG_CONST png_byte out_bd = dp->output_bit_depth;
PNG_CONST png_byte sample_depth = (png_byte)(out_ct ==
PNG_COLOR_TYPE_PALETTE ? 8 : out_bd);
PNG_CONST png_byte red_sBIT = dp->this.red_sBIT;
PNG_CONST png_byte green_sBIT = dp->this.green_sBIT;
PNG_CONST png_byte blue_sBIT = dp->this.blue_sBIT;
PNG_CONST png_byte alpha_sBIT = dp->this.alpha_sBIT;
PNG_CONST int have_tRNS = dp->this.is_transparent;
standard_palette out_palette;
png_uint_32 y;
UNUSED(pi)
if (out_ct == PNG_COLOR_TYPE_PALETTE)
(void)standard_palette_init(out_palette, pp, pi);
else
memset(out_palette, 0x5e, sizeof out_palette);
for (y=0; y<h; ++y, pRow += cbRow)
{
png_uint_32 x;
png_byte std[STANDARD_ROWMAX];
transform_row(pp, std, in_ct, in_bd, y);
for (x=0; x<w; ++x)
{
image_pixel in_pixel, out_pixel;
unsigned int r, g, b, a;
image_pixel_init(&in_pixel, std, in_ct, in_bd, x, dp->this.palette);
in_pixel.red_sBIT = red_sBIT;
in_pixel.green_sBIT = green_sBIT;
in_pixel.blue_sBIT = blue_sBIT;
in_pixel.alpha_sBIT = alpha_sBIT;
in_pixel.have_tRNS = have_tRNS;
r = in_pixel.red;
g = in_pixel.green;
b = in_pixel.blue;
a = in_pixel.alpha;
dp->transform_list->mod(dp->transform_list, &in_pixel, pp, dp);
image_pixel_init(&out_pixel, pRow, out_ct, out_bd, x, out_palette);
if (in_ct == PNG_COLOR_TYPE_PALETTE &&
out_ct == PNG_COLOR_TYPE_PALETTE)
{
if (in_pixel.palette_index != out_pixel.palette_index)
png_error(pp, "unexpected transformed palette index");
}
if (in_pixel.red != out_pixel.red)
transform_range_check(pp, r, g, b, a, in_pixel.red, in_pixel.redf,
out_pixel.red, sample_depth, in_pixel.rede, "red/gray");
if ((out_ct & PNG_COLOR_MASK_COLOR) != 0 &&
in_pixel.green != out_pixel.green)
transform_range_check(pp, r, g, b, a, in_pixel.green,
in_pixel.greenf, out_pixel.green, sample_depth, in_pixel.greene,
"green");
if ((out_ct & PNG_COLOR_MASK_COLOR) != 0 &&
in_pixel.blue != out_pixel.blue)
transform_range_check(pp, r, g, b, a, in_pixel.blue, in_pixel.bluef,
out_pixel.blue, sample_depth, in_pixel.bluee, "blue");
if ((out_ct & PNG_COLOR_MASK_ALPHA) != 0 &&
in_pixel.alpha != out_pixel.alpha)
transform_range_check(pp, r, g, b, a, in_pixel.alpha,
in_pixel.alphaf, out_pixel.alpha, sample_depth, in_pixel.alphae,
"alpha");
}
}
dp->this.ps->validated = 1;
}
static void
transform_end(png_structp pp, png_infop pi)
{
transform_display *dp = png_get_progressive_ptr(pp);
transform_image_validate(dp, pp, pi, dp->this.ps->image);
}
static void
transform_test(png_modifier *pmIn, PNG_CONST png_uint_32 idIn,
PNG_CONST image_transform* transform_listIn, PNG_CONST char *name)
{
transform_display d;
context(&pmIn->this, fault);
transform_display_init(&d, pmIn, idIn, transform_listIn);
Try
{
png_structp pp;
png_infop pi;
pp = set_modifier_for_read(d.pm, &pi, d.this.id, name);
# if 0
{
char buffer[256];
(void)store_message(&d.pm->this, pp, buffer, sizeof buffer, 0,
"running test");
fprintf(stderr, "%s\n", buffer);
}
# endif
if (d.pm->this.progressive)
{
png_set_progressive_read_fn(pp, &d, transform_info, progressive_row,
transform_end);
modifier_progressive_read(d.pm, pp, pi);
}
else
{
png_set_read_fn(pp, d.pm, modifier_read);
png_read_info(pp, pi);
transform_info_imp(&d, pp, pi);
sequential_row(&d.this, pp, pi, NULL, d.this.ps->image);
transform_image_validate(&d, pp, pi, d.this.ps->image);
}
modifier_reset(d.pm);
}
Catch(fault)
modifier_reset((png_modifier*)fault);
}
#define ITSTRUCT(name) image_transform_##name
#define IT(name,prev)\
static image_transform ITSTRUCT(name) =\
{\
#name,\
1, \
&ITSTRUCT(prev), \
0, \
0, \
0, \
image_transform_png_set_##name##_set,\
image_transform_png_set_##name##_mod,\
image_transform_png_set_##name##_add\
}
static int
image_transform_default_add(image_transform *this,
PNG_CONST image_transform **that, png_byte colour_type, png_byte bit_depth)
{
UNUSED(colour_type)
UNUSED(bit_depth)
this->next = *that;
*that = this;
return 1;
}
static void
image_transform_png_set_palette_to_rgb_set(PNG_CONST image_transform *this,
transform_display *that, png_structp pp, png_infop pi)
{
png_set_palette_to_rgb(pp);
this->next->set(this->next, that, pp, pi);
}
static void
image_transform_png_set_palette_to_rgb_mod(PNG_CONST image_transform *this,
image_pixel *that, png_structp pp, PNG_CONST transform_display *display)
{
if (that->colour_type == PNG_COLOR_TYPE_PALETTE)
image_pixel_convert_PLTE(that, &display->this);
this->next->mod(this->next, that, pp, display);
}
static int
image_transform_png_set_palette_to_rgb_add(image_transform *this,
PNG_CONST image_transform **that, png_byte colour_type, png_byte bit_depth)
{
UNUSED(bit_depth)
this->next = *that;
*that = this;
return colour_type == PNG_COLOR_TYPE_PALETTE;
}
IT(palette_to_rgb, end);
static void
image_transform_png_set_tRNS_to_alpha_set(PNG_CONST image_transform *this,
transform_display *that, png_structp pp, png_infop pi)
{
png_set_tRNS_to_alpha(pp);
this->next->set(this->next, that, pp, pi);
}
static void
image_transform_png_set_tRNS_to_alpha_mod(PNG_CONST image_transform *this,
image_pixel *that, png_structp pp, PNG_CONST transform_display *display)
{
if (that->colour_type == PNG_COLOR_TYPE_PALETTE)
image_pixel_convert_PLTE(that, &display->this);
if (that->have_tRNS)
image_pixel_add_alpha(that, &display->this);
else
{
if (that->bit_depth < 8)
that->bit_depth =8;
if (that->sample_depth < 8)
that->sample_depth = 8;
}
this->next->mod(this->next, that, pp, display);
}
static int
image_transform_png_set_tRNS_to_alpha_add(image_transform *this,
PNG_CONST image_transform **that, png_byte colour_type, png_byte bit_depth)
{
UNUSED(bit_depth)
this->next = *that;
*that = this;
return (colour_type & PNG_COLOR_MASK_ALPHA) == 0;
}
IT(tRNS_to_alpha,palette_to_rgb);
static void
image_transform_png_set_gray_to_rgb_set(PNG_CONST image_transform *this,
transform_display *that, png_structp pp, png_infop pi)
{
png_set_gray_to_rgb(pp);
this->next->set(this->next, that, pp, pi);
}
static void
image_transform_png_set_gray_to_rgb_mod(PNG_CONST image_transform *this,
image_pixel *that, png_structp pp, PNG_CONST transform_display *display)
{
if ((that->colour_type & PNG_COLOR_MASK_COLOR) == 0 && that->have_tRNS)
image_pixel_add_alpha(that, &display->this);
if (that->colour_type == PNG_COLOR_TYPE_GRAY)
{
if (that->bit_depth < 8)
that->sample_depth = that->bit_depth = 8;
that->colour_type = PNG_COLOR_TYPE_RGB;
}
else if (that->colour_type == PNG_COLOR_TYPE_GRAY_ALPHA)
that->colour_type = PNG_COLOR_TYPE_RGB_ALPHA;
this->next->mod(this->next, that, pp, display);
}
static int
image_transform_png_set_gray_to_rgb_add(image_transform *this,
PNG_CONST image_transform **that, png_byte colour_type, png_byte bit_depth)
{
UNUSED(bit_depth)
this->next = *that;
*that = this;
return (colour_type & PNG_COLOR_MASK_COLOR) == 0;
}
IT(gray_to_rgb,tRNS_to_alpha);
static void
image_transform_png_set_expand_set(PNG_CONST image_transform *this,
transform_display *that, png_structp pp, png_infop pi)
{
png_set_expand(pp);
this->next->set(this->next, that, pp, pi);
}
static void
image_transform_png_set_expand_mod(PNG_CONST image_transform *this,
image_pixel *that, png_structp pp, PNG_CONST transform_display *display)
{
if (that->colour_type == PNG_COLOR_TYPE_PALETTE)
image_pixel_convert_PLTE(that, &display->this);
else if (that->bit_depth < 8)
that->sample_depth = that->bit_depth = 8;
if (that->have_tRNS)
image_pixel_add_alpha(that, &display->this);
this->next->mod(this->next, that, pp, display);
}
static int
image_transform_png_set_expand_add(image_transform *this,
PNG_CONST image_transform **that, png_byte colour_type, png_byte bit_depth)
{
UNUSED(bit_depth)
this->next = *that;
*that = this;
return (colour_type & PNG_COLOR_MASK_ALPHA) == 0;
}
IT(expand,gray_to_rgb);
static void
image_transform_png_set_expand_gray_1_2_4_to_8_set(
PNG_CONST image_transform *this, transform_display *that, png_structp pp,
png_infop pi)
{
png_set_expand_gray_1_2_4_to_8(pp);
this->next->set(this->next, that, pp, pi);
}
static void
image_transform_png_set_expand_gray_1_2_4_to_8_mod(
PNG_CONST image_transform *this, image_pixel *that, png_structp pp,
PNG_CONST transform_display *display)
{
image_transform_png_set_expand_mod(this, that, pp, display);
}
static int
image_transform_png_set_expand_gray_1_2_4_to_8_add(image_transform *this,
PNG_CONST image_transform **that, png_byte colour_type, png_byte bit_depth)
{
return image_transform_png_set_expand_add(this, that, colour_type,
bit_depth);
}
IT(expand_gray_1_2_4_to_8, expand);
static void
image_transform_png_set_strip_16_set(PNG_CONST image_transform *this,
transform_display *that, png_structp pp, png_infop pi)
{
png_set_strip_16(pp);
this->next->set(this->next, that, pp, pi);
}
static void
image_transform_png_set_strip_16_mod(PNG_CONST image_transform *this,
image_pixel *that, png_structp pp, PNG_CONST transform_display *display)
{
if (that->bit_depth == 16)
{
that->sample_depth = that->bit_depth = 8;
if (that->red_sBIT > 8) that->red_sBIT = 8;
if (that->green_sBIT > 8) that->green_sBIT = 8;
if (that->blue_sBIT > 8) that->blue_sBIT = 8;
if (that->alpha_sBIT > 8) that->alpha_sBIT = 8;
# ifndef PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
{
PNG_CONST double d = (255-128.5)/65535;
that->rede += d;
that->greene += d;
that->bluee += d;
that->alphae += d;
}
# endif
}
this->next->mod(this->next, that, pp, display);
}
static int
image_transform_png_set_strip_16_add(image_transform *this,
PNG_CONST image_transform **that, png_byte colour_type, png_byte bit_depth)
{
UNUSED(colour_type)
this->next = *that;
*that = this;
return bit_depth > 8;
}
IT(strip_16, expand_gray_1_2_4_to_8);
static void
image_transform_png_set_strip_alpha_set(PNG_CONST image_transform *this,
transform_display *that, png_structp pp, png_infop pi)
{
png_set_strip_alpha(pp);
this->next->set(this->next, that, pp, pi);
}
static void
image_transform_png_set_strip_alpha_mod(PNG_CONST image_transform *this,
image_pixel *that, png_structp pp, PNG_CONST transform_display *display)
{
if (that->colour_type == PNG_COLOR_TYPE_GRAY_ALPHA)
that->colour_type = PNG_COLOR_TYPE_GRAY;
else if (that->colour_type == PNG_COLOR_TYPE_RGB_ALPHA)
that->colour_type = PNG_COLOR_TYPE_RGB;
that->have_tRNS = 0;
that->alphaf = 1;
that->alphae = 0;
this->next->mod(this->next, that, pp, display);
}
static int
image_transform_png_set_strip_alpha_add(image_transform *this,
PNG_CONST image_transform **that, png_byte colour_type, png_byte bit_depth)
{
UNUSED(bit_depth)
this->next = *that;
*that = this;
return (colour_type & PNG_COLOR_MASK_ALPHA) != 0;
}
IT(strip_alpha,strip_16);
static void
image_transform_png_set_rgb_to_gray_set(PNG_CONST image_transform *this,
transform_display *that, png_structp pp, png_infop pi)
{
PNG_CONST int error_action = 1;
# ifdef PNG_FLOATING_POINT_SUPPORTED
png_set_rgb_to_gray(pp, error_action, -1, -1);
# else
png_set_rgb_to_gray_fixed(pp, error_action, -1, -1);
# endif
this->next->set(this->next, that, pp, pi);
}
static void
image_transform_png_set_rgb_to_gray_mod(PNG_CONST image_transform *this,
image_pixel *that, png_structp pp, PNG_CONST transform_display *display)
{
if ((that->colour_type & PNG_COLOR_MASK_COLOR) != 0)
{
if (that->colour_type == PNG_COLOR_TYPE_PALETTE)
image_pixel_convert_PLTE(that, &display->this);
that->bluef = that->greenf = that->redf = (that->redf * 6968 +
that->greenf * 23434 + that->bluef * 2366) / 32768;
that->bluee = that->greene = that->rede = (that->rede * 6968 +
that->greene * 23434 + that->bluee * 2366) / 32768 *
(1 + DBL_EPSILON * 6);
if (that->red_sBIT > that->green_sBIT)
that->red_sBIT = that->green_sBIT;
if (that->red_sBIT > that->blue_sBIT)
that->red_sBIT = that->blue_sBIT;
that->blue_sBIT = that->green_sBIT = that->red_sBIT;
if (that->colour_type == PNG_COLOR_TYPE_RGB)
that->colour_type = PNG_COLOR_TYPE_GRAY;
else if (that->colour_type == PNG_COLOR_TYPE_RGB_ALPHA)
that->colour_type = PNG_COLOR_TYPE_GRAY_ALPHA;
}
this->next->mod(this->next, that, pp, display);
}
static int
image_transform_png_set_rgb_to_gray_add(image_transform *this,
PNG_CONST image_transform **that, png_byte colour_type, png_byte bit_depth)
{
UNUSED(bit_depth)
this->next = *that;
*that = this;
return (colour_type & PNG_COLOR_MASK_COLOR) != 0;
}
IT(rgb_to_gray,strip_alpha);
static void
image_transform_png_set_background_set(PNG_CONST image_transform *this,
transform_display *that, png_structp pp, png_infop pi)
{
png_color_16 back;
back.index = 255;
back.gray = back.blue = back.green = back.red =
(png_uint_16)((1U << that->this.bit_depth) >> 1);
# ifdef PNG_FLOATING_POINT_SUPPORTED
png_set_background(pp, &back, PNG_BACKGROUND_GAMMA_FILE, 1, 0);
# else
png_set_background_fixed(pp, &back, PNG_BACKGROUND_GAMMA_FILE, 1, 0);
# endif
this->next->set(this->next, that, pp, pi);
}
static void
image_transform_png_set_background_mod(PNG_CONST image_transform *this,
image_pixel *that, png_structp pp, PNG_CONST transform_display *display)
{
if (that->have_tRNS && that->colour_type != PNG_COLOR_TYPE_PALETTE)
image_pixel_add_alpha(that, &display->this);
if (that->alphaf < 1)
{
unsigned int tmp = (1U << display->this.bit_depth);
double component = (tmp >> 1)/(double)(tmp-1);
if (that->alphaf <= 0)
{
that->bluef = that->greenf = that->redf = component;
that->bluee = that->greene = that->rede = component * DBL_EPSILON;
that->blue_sBIT = that->green_sBIT = that->red_sBIT = that->bit_depth;
}
else
{
component *= 1-that->alphaf;
that->redf = that->redf * that->alphaf + component;
that->rede = that->rede * that->alphaf + that->redf * 3 * DBL_EPSILON;
that->greenf = that->greenf * that->alphaf + component;
that->greene = that->greene * that->alphaf + that->greenf * 3 *
DBL_EPSILON;
that->bluef = that->bluef * that->alphaf + component;
that->bluee = that->bluee * that->alphaf + that->bluef * 3 *
DBL_EPSILON;
}
that->alphaf = 1;
that->alphae = 0;
if (that->colour_type == PNG_COLOR_TYPE_RGB_ALPHA)
that->colour_type = PNG_COLOR_TYPE_RGB;
else if (that->colour_type == PNG_COLOR_TYPE_GRAY_ALPHA)
that->colour_type = PNG_COLOR_TYPE_GRAY;
}
this->next->mod(this->next, that, pp, display);
}
#define image_transform_png_set_background_add image_transform_default_add
IT(background,rgb_to_gray);
static image_transform *PNG_CONST image_transform_first = &ITSTRUCT(background);
static void
transform_enable(PNG_CONST char *name)
{
static int all_disabled = 0;
int found_it = 0;
image_transform *list = image_transform_first;
while (list != &image_transform_end)
{
if (strcmp(list->name, name) == 0)
{
list->enable = 1;
found_it = 1;
}
else if (!all_disabled)
list->enable = 0;
list = list->list;
}
all_disabled = 1;
if (!found_it)
{
fprintf(stderr, "pngvalid: --transform-enable=%s: unknown transform\n",
name);
exit(1);
}
}
static void
transform_disable(PNG_CONST char *name)
{
image_transform *list = image_transform_first;
while (list != &image_transform_end)
{
if (strcmp(list->name, name) == 0)
{
list->enable = 0;
return;
}
list = list->list;
}
fprintf(stderr, "pngvalid: --transform-disable=%s: unknown transform\n",
name);
exit(1);
}
static void
image_transform_reset_count(void)
{
image_transform *next = image_transform_first;
int count = 0;
while (next != &image_transform_end)
{
next->local_use = 0;
next->next = 0;
next = next->list;
++count;
}
if (count > 32) abort();
}
static int
image_transform_test_counter(png_uint_32 counter, unsigned int max)
{
image_transform *next = image_transform_first;
while (next != &image_transform_end)
{
counter >>= 1;
if (max > 1 && next->local_use < max)
return 1;
next = next->list;
}
return max <= 1 && counter == 0;
}
static png_uint_32
image_transform_add(PNG_CONST image_transform **this, unsigned int max,
png_uint_32 counter, char *name, size_t sizeof_name, size_t *pos,
png_byte colour_type, png_byte bit_depth)
{
for (;;)
{
png_uint_32 mask;
image_transform *list;
if (counter == 0)
{
image_transform_reset_count();
if (max <= 1)
counter = 1;
else
counter = random_32();
}
else
{
switch (max)
{
case 0: ++counter; break;
case 1: counter <<= 1; break;
default: counter = random_32(); break;
}
}
*this = &image_transform_end;
list = image_transform_first;
mask = 1;
while (list != &image_transform_end)
{
if ((counter & mask) != 0 && list->enable &&
(max == 0 || list->local_use < max))
{
if (list->add(list, this, colour_type, bit_depth) || max == 0)
{
*pos = safecat(name, sizeof_name, *pos, " +");
*pos = safecat(name, sizeof_name, *pos, list->name);
}
else
{
*this = list->next;
list->next = 0;
list->local_use = max;
}
}
mask <<= 1;
list = list->list;
}
if (*this != &image_transform_end)
return counter;
if (!image_transform_test_counter(counter, max))
return 0;
}
}
#ifdef THIS_IS_THE_PROFORMA
static void
image_transform_png_set_@_set(PNG_CONST image_transform *this,
transform_display *that, png_structp pp, png_infop pi)
{
png_set_@(pp);
this->next->set(this->next, that, pp, pi);
}
static void
image_transform_png_set_@_mod(PNG_CONST image_transform *this,
image_pixel *that, png_structp pp, PNG_CONST transform_display *display)
{
this->next->mod(this->next, that, pp, display);
}
static int
image_transform_png_set_@_add(image_transform *this,
PNG_CONST image_transform **that, char *name, size_t sizeof_name,
size_t *pos, png_byte colour_type, png_byte bit_depth)
{
this->next = *that;
*that = this;
*pos = safecat(name, sizeof_name, *pos, " +@");
return 1;
}
IT(@);
#endif
static int
test_transform(png_modifier* PNG_CONST pm, png_byte PNG_CONST colour_type,
int bdlo, int PNG_CONST bdhi, png_uint_32 max)
{
for (; bdlo <= bdhi; ++bdlo)
{
PNG_CONST png_byte bit_depth = DEPTH(bdlo);
png_uint_32 counter = 0;
size_t base_pos;
char name[64];
base_pos = safecat(name, sizeof name, 0, "transform:");
for (;;)
{
size_t pos = base_pos;
PNG_CONST image_transform *list = 0;
counter = image_transform_add(&list, max, counter, name, sizeof name,
&pos, colour_type, bit_depth);
if (counter == 0)
break;
transform_test(pm, FILEID(colour_type, bit_depth, pm->interlace_type,
0, 0, 0), list, name);
if (fail(pm))
return 0;
}
}
return 1;
}
static void
perform_transform_test(png_modifier *pm)
{
if (!test_transform(pm, 0, 0, READ_BDHI, 1))
return;
if (!test_transform(pm, 2, 3, READ_BDHI, 1))
return;
if (!test_transform(pm, 3, 0, 3, 1))
return;
if (!test_transform(pm, 4, 3, READ_BDHI, 1))
return;
if (!test_transform(pm, 6, 3, READ_BDHI, 1))
return;
}
typedef struct gamma_modification
{
png_modification this;
png_fixed_point gamma;
} gamma_modification;
static int
gamma_modify(png_modifier *pm, png_modification *me, int add)
{
UNUSED(add)
png_save_uint_32(pm->buffer, 4);
png_save_uint_32(pm->buffer+4, CHUNK_gAMA);
png_save_uint_32(pm->buffer+8, ((gamma_modification*)me)->gamma);
return 1;
}
static void
gamma_modification_init(gamma_modification *me, png_modifier *pm, double gammad)
{
double g;
modification_init(&me->this);
me->this.chunk = CHUNK_gAMA;
me->this.modify_fn = gamma_modify;
me->this.add = CHUNK_PLTE;
g = floor(gammad * 100000 + .5);
me->gamma = (png_fixed_point)g;
me->this.next = pm->modifications;
pm->modifications = &me->this;
}
typedef struct srgb_modification
{
png_modification this;
png_byte intent;
} srgb_modification;
static int
srgb_modify(png_modifier *pm, png_modification *me, int add)
{
UNUSED(add)
png_save_uint_32(pm->buffer, 1);
png_save_uint_32(pm->buffer+4, CHUNK_sRGB);
pm->buffer[8] = ((srgb_modification*)me)->intent;
return 1;
}
static void
srgb_modification_init(srgb_modification *me, png_modifier *pm, png_byte intent)
{
modification_init(&me->this);
me->this.chunk = CHUNK_sBIT;
if (intent <= 3)
{
me->this.modify_fn = srgb_modify;
me->this.add = CHUNK_PLTE;
me->intent = intent;
}
else
{
me->this.modify_fn = 0;
me->this.add = 0;
me->intent = 0;
}
me->this.next = pm->modifications;
pm->modifications = &me->this;
}
typedef struct sbit_modification
{
png_modification this;
png_byte sbit;
} sbit_modification;
static int
sbit_modify(png_modifier *pm, png_modification *me, int add)
{
png_byte sbit = ((sbit_modification*)me)->sbit;
if (pm->bit_depth > sbit)
{
int cb = 0;
switch (pm->colour_type)
{
case 0:
cb = 1;
break;
case 2:
case 3:
cb = 3;
break;
case 4:
cb = 2;
break;
case 6:
cb = 4;
break;
default:
png_error(pm->this.pread,
"unexpected colour type in sBIT modification");
}
png_save_uint_32(pm->buffer, cb);
png_save_uint_32(pm->buffer+4, CHUNK_sBIT);
while (cb > 0)
(pm->buffer+8)[--cb] = sbit;
return 1;
}
else if (!add)
{
pm->buffer_count = pm->buffer_position = 0;
return 1;
}
else
return 0;
}
static void
sbit_modification_init(sbit_modification *me, png_modifier *pm, png_byte sbit)
{
modification_init(&me->this);
me->this.chunk = CHUNK_sBIT;
me->this.modify_fn = sbit_modify;
me->this.add = CHUNK_PLTE;
me->sbit = sbit;
me->this.next = pm->modifications;
pm->modifications = &me->this;
}
typedef struct gamma_display
{
standard_display this;
png_modifier* pm;
double file_gamma;
double screen_gamma;
png_byte sbit;
int threshold_test;
PNG_CONST char* name;
int speed;
int use_input_precision;
int strip16;
double maxerrout;
double maxerrpc;
double maxerrabs;
} gamma_display;
static void
gamma_display_init(gamma_display *dp, png_modifier *pm, png_uint_32 id,
double file_gamma, double screen_gamma, png_byte sbit, int threshold_test,
int speed, int use_input_precision, int strip16)
{
standard_display_init(&dp->this, &pm->this, id, 0);
dp->pm = pm;
dp->file_gamma = file_gamma;
dp->screen_gamma = screen_gamma;
dp->sbit = sbit;
dp->threshold_test = threshold_test;
dp->speed = speed;
dp->use_input_precision = use_input_precision;
dp->strip16 = strip16;
dp->maxerrout = dp->maxerrpc = dp->maxerrabs = 0;
}
static void
gamma_info_imp(gamma_display *dp, png_structp pp, png_infop pi)
{
standard_info_part1(&dp->this, pp, pi);
if (dp->strip16)
# ifdef PNG_READ_16_TO_8_SUPPORTED
png_set_strip_16(pp);
# else
png_error(pp, "strip16 (16 to 8 bit conversion) not supported");
# endif
png_read_update_info(pp, pi);
standard_info_part2(&dp->this, pp, pi, 1 );
}
static void
gamma_info(png_structp pp, png_infop pi)
{
gamma_info_imp(png_get_progressive_ptr(pp), pp, pi);
}
static void
gamma_image_validate(gamma_display *dp, png_structp pp, png_infop pi,
png_const_bytep pRow)
{
PNG_CONST png_byte sbit = dp->sbit;
PNG_CONST double file_gamma = dp->file_gamma;
PNG_CONST double screen_gamma = dp->screen_gamma;
PNG_CONST int use_input_precision = dp->use_input_precision;
PNG_CONST int speed = dp->speed;
PNG_CONST png_byte in_ct = dp->this.colour_type;
PNG_CONST png_byte in_bd = dp->this.bit_depth;
PNG_CONST png_uint_32 w = dp->this.w;
PNG_CONST png_uint_32 h = dp->this.h;
PNG_CONST size_t cbRow = dp->this.cbRow;
PNG_CONST png_byte out_ct = png_get_color_type(pp, pi);
PNG_CONST png_byte out_bd = png_get_bit_depth(pp, pi);
PNG_CONST unsigned int outmax = (1U<<out_bd)-1;
PNG_CONST double maxabs = abserr(dp->pm, out_bd);
PNG_CONST double maxout = outerr(dp->pm, out_bd);
PNG_CONST double maxpc = pcerr(dp->pm, out_bd);
PNG_CONST int processing = (fabs(screen_gamma*file_gamma-1) >=
PNG_GAMMA_THRESHOLD && !dp->threshold_test && !speed && in_ct != 3) ||
in_bd != out_bd;
PNG_CONST unsigned int samples_per_pixel = (out_ct & 2U) ? 3U : 1U;
PNG_CONST double gamma_correction = 1/(file_gamma*screen_gamma);
double maxerrout = 0, maxerrabs = 0, maxerrpc = 0;
png_uint_32 y;
for (y=0; y<h; ++y, pRow += cbRow)
{
unsigned int s, x;
png_byte std[STANDARD_ROWMAX];
transform_row(pp, std, in_ct, in_bd, y);
if (processing)
{
for (x=0; x<w; ++x) for (s=0; s<samples_per_pixel; ++s)
{
PNG_CONST unsigned int
id = sample(std, in_ct, in_bd, x, s);
PNG_CONST unsigned int
od = sample(pRow, out_ct, out_bd, x, s);
PNG_CONST unsigned int
isbit = id >> (in_bd-sbit);
double i, input_sample, encoded_sample, output;
double encoded_error, error;
double es_lo, es_hi;
i = isbit; i /= (1U<<sbit)-1;
encoded_sample = pow(i, gamma_correction) * outmax;
encoded_error = fabs(od-encoded_sample);
if (encoded_error > maxerrout)
maxerrout = encoded_error;
if (encoded_error < .5+maxout)
continue;
input_sample = pow(i, 1/file_gamma);
output = od;
output /= outmax;
output = pow(output, screen_gamma);
error = fabs(input_sample-output);
if (error > maxerrabs)
maxerrabs = error;
if (input_sample*maxpc > .5+maxabs)
{
double percentage_error = error/input_sample;
if (percentage_error > maxerrpc) maxerrpc = percentage_error;
}
{
double tmp = input_sample * maxpc;
if (tmp < maxabs) tmp = maxabs;
es_lo = encoded_sample - maxout;
if (es_lo > 0 && input_sample-tmp > 0)
{
double low_value = outmax * pow(input_sample-tmp,
1/screen_gamma);
if (low_value < es_lo) es_lo = low_value;
}
else
es_lo = 0;
es_hi = encoded_sample + maxout;
if (es_hi < outmax && input_sample+tmp < 1)
{
double high_value = outmax * pow(input_sample+tmp,
1/screen_gamma);
if (high_value > es_hi) es_hi = high_value;
}
else
es_hi = outmax;
}
if (od+.5 < es_lo || od-.5 > es_hi)
{
double is_lo, is_hi;
if (use_input_precision)
{
double tmp = (isbit - .5)/((1U<<sbit)-1);
if (tmp > 0)
{
is_lo = outmax * pow(tmp, gamma_correction) - maxout;
if (is_lo < 0) is_lo = 0;
}
else
is_lo = 0;
tmp = (isbit + .5)/((1U<<sbit)-1);
if (tmp < 1)
{
is_hi = outmax * pow(tmp, gamma_correction) + maxout;
if (is_hi > outmax) is_hi = outmax;
}
else
is_hi = outmax;
if (!(od+.5 < is_lo || od-.5 > is_hi))
continue;
}
else
is_lo = es_lo, is_hi = es_hi;
{
char msg[256];
sprintf(msg,
"error: %.3f; %u{%u;%u} -> %u not %.2f (%.1f-%.1f)",
od-encoded_sample, id, sbit, isbit, od,
encoded_sample, is_lo, is_hi);
png_warning(pp, msg);
}
}
}
}
else if (!speed && memcmp(std, pRow, cbRow) != 0)
{
char msg[64];
sprintf(msg, "gamma: below threshold row %d changed", y);
png_error(pp, msg);
}
}
dp->maxerrout = maxerrout;
dp->maxerrabs = maxerrabs;
dp->maxerrpc = maxerrpc;
dp->this.ps->validated = 1;
}
static void
gamma_end(png_structp pp, png_infop pi)
{
gamma_display *dp = png_get_progressive_ptr(pp);
gamma_image_validate(dp, pp, pi, dp->this.ps->image);
}
static void
gamma_test(png_modifier *pmIn, PNG_CONST png_byte colour_typeIn,
PNG_CONST png_byte bit_depthIn, PNG_CONST int interlace_typeIn,
PNG_CONST double file_gammaIn, PNG_CONST double screen_gammaIn,
PNG_CONST png_byte sbitIn, PNG_CONST int threshold_testIn,
PNG_CONST char *name, PNG_CONST int speedIn,
PNG_CONST int use_input_precisionIn, PNG_CONST int strip16In)
{
gamma_display d;
context(&pmIn->this, fault);
gamma_display_init(&d, pmIn, FILEID(colour_typeIn, bit_depthIn,
interlace_typeIn, 0, 0, 0), file_gammaIn, screen_gammaIn, sbitIn,
threshold_testIn, speedIn, use_input_precisionIn, strip16In);
Try
{
png_structp pp;
png_infop pi;
gamma_modification gamma_mod;
srgb_modification srgb_mod;
sbit_modification sbit_mod;
d.pm->modifications = NULL;
gamma_modification_init(&gamma_mod, d.pm, d.file_gamma);
srgb_modification_init(&srgb_mod, d.pm, 127 );
sbit_modification_init(&sbit_mod, d.pm, d.sbit);
modification_reset(d.pm->modifications);
pp = set_modifier_for_read(d.pm, &pi, d.this.id, name);
#ifdef PNG_FLOATING_POINT_SUPPORTED
png_set_gamma(pp, d.screen_gamma, d.file_gamma);
#else
{
png_fixed_point s = floor(d.screen_gamma*100000+.5);
png_fixed_point f = floor(d.file_gamma*100000+.5);
png_set_gamma_fixed(pp, s, f);
}
#endif
if (d.pm->this.progressive)
{
png_set_progressive_read_fn(pp, &d, gamma_info, progressive_row,
gamma_end);
modifier_progressive_read(d.pm, pp, pi);
}
else
{
png_set_read_fn(pp, d.pm, modifier_read);
png_read_info(pp, pi);
gamma_info_imp(&d, pp, pi);
sequential_row(&d.this, pp, pi, NULL, d.this.ps->image);
gamma_image_validate(&d, pp, pi, d.this.ps->image);
}
modifier_reset(d.pm);
if (d.pm->log && !d.threshold_test && !d.speed)
fprintf(stderr, "%d bit %s %s: max error %f (%.2g, %2g%%)\n",
d.this.bit_depth, colour_types[d.this.colour_type], d.name,
d.maxerrout, d.maxerrabs, 100*d.maxerrpc);
if (d.this.colour_type == 0 || d.this.colour_type == 4)
{
switch (d.this.bit_depth)
{
case 1:
break;
case 2:
if (d.maxerrout > d.pm->error_gray_2)
d.pm->error_gray_2 = d.maxerrout;
break;
case 4:
if (d.maxerrout > d.pm->error_gray_4)
d.pm->error_gray_4 = d.maxerrout;
break;
case 8:
if (d.maxerrout > d.pm->error_gray_8)
d.pm->error_gray_8 = d.maxerrout;
break;
case 16:
if (d.maxerrout > d.pm->error_gray_16)
d.pm->error_gray_16 = d.maxerrout;
break;
default:
png_error(pp, "bad bit depth (internal: 1)");
}
}
else if (d.this.colour_type == 2 || d.this.colour_type == 6)
{
switch (d.this.bit_depth)
{
case 8:
if (d.maxerrout > d.pm->error_color_8)
d.pm->error_color_8 = d.maxerrout;
break;
case 16:
if (d.maxerrout > d.pm->error_color_16)
d.pm->error_color_16 = d.maxerrout;
break;
default:
png_error(pp, "bad bit depth (internal: 2)");
}
}
}
Catch(fault)
modifier_reset((png_modifier*)fault);
}
static void gamma_threshold_test(png_modifier *pm, png_byte colour_type,
png_byte bit_depth, int interlace_type, double file_gamma,
double screen_gamma)
{
size_t pos = 0;
char name[64];
pos = safecat(name, sizeof name, pos, "threshold ");
pos = safecatd(name, sizeof name, pos, file_gamma, 3);
pos = safecat(name, sizeof name, pos, "/");
pos = safecatd(name, sizeof name, pos, screen_gamma, 3);
(void)gamma_test(pm, colour_type, bit_depth, interlace_type, file_gamma,
screen_gamma, bit_depth, 1, name, 0 , 0 ,
0 );
}
static void
perform_gamma_threshold_tests(png_modifier *pm)
{
png_byte colour_type = 0;
png_byte bit_depth = 0;
while (next_format(&colour_type, &bit_depth))
{
double test_gamma = 1.0;
while (test_gamma >= .4)
{
gamma_threshold_test(pm, colour_type, bit_depth, pm->interlace_type,
test_gamma, 1/test_gamma);
test_gamma *= .95;
}
gamma_threshold_test(pm, colour_type, bit_depth, pm->interlace_type,
.45455, 2.2);
if (fail(pm))
return;
}
}
static void gamma_transform_test(png_modifier *pm,
PNG_CONST png_byte colour_type, PNG_CONST png_byte bit_depth,
PNG_CONST int interlace_type, PNG_CONST double file_gamma,
PNG_CONST double screen_gamma, PNG_CONST png_byte sbit, PNG_CONST int speed,
PNG_CONST int use_input_precision, PNG_CONST int strip16)
{
size_t pos = 0;
char name[64];
if (sbit != bit_depth)
{
pos = safecat(name, sizeof name, pos, "sbit(");
pos = safecatn(name, sizeof name, pos, sbit);
pos = safecat(name, sizeof name, pos, ") ");
}
else
pos = safecat(name, sizeof name, pos, "gamma ");
if (strip16)
pos = safecat(name, sizeof name, pos, "16to8 ");
pos = safecatd(name, sizeof name, pos, file_gamma, 3);
pos = safecat(name, sizeof name, pos, "->");
pos = safecatd(name, sizeof name, pos, screen_gamma, 3);
gamma_test(pm, colour_type, bit_depth, interlace_type, file_gamma,
screen_gamma, sbit, 0, name, speed, use_input_precision, strip16);
}
static void perform_gamma_transform_tests(png_modifier *pm, int speed)
{
png_byte colour_type = 0;
png_byte bit_depth = 0;
while (next_format(&colour_type, &bit_depth)) if (colour_type != 3)
{
unsigned int i, j;
for (i=0; i<pm->ngammas; ++i) for (j=0; j<pm->ngammas; ++j) if (i != j)
{
gamma_transform_test(pm, colour_type, bit_depth, pm->interlace_type,
1/pm->gammas[i], pm->gammas[j], bit_depth, speed,
pm->use_input_precision, 0 );
if (fail(pm))
return;
}
}
}
static void perform_gamma_sbit_tests(png_modifier *pm, int speed)
{
png_byte sbit;
for (sbit=pm->sbitlow; sbit<(1<<READ_BDHI); ++sbit)
{
unsigned int i, j;
for (i=0; i<pm->ngammas; ++i)
{
for (j=0; j<pm->ngammas; ++j)
{
if (i != j)
{
if (sbit < 8)
{
gamma_transform_test(pm, 0, 8, pm->interlace_type,
1/pm->gammas[i], pm->gammas[j], sbit, speed,
pm->use_input_precision_sbit, 0 );
if (fail(pm))
return;
gamma_transform_test(pm, 2, 8, pm->interlace_type,
1/pm->gammas[i], pm->gammas[j], sbit, speed,
pm->use_input_precision_sbit, 0 );
if (fail(pm))
return;
}
#ifdef DO_16BIT
gamma_transform_test(pm, 0, 16, pm->interlace_type,
1/pm->gammas[i], pm->gammas[j], sbit, speed,
pm->use_input_precision_sbit, 0 );
if (fail(pm))
return;
gamma_transform_test(pm, 2, 16, pm->interlace_type,
1/pm->gammas[i], pm->gammas[j], sbit, speed,
pm->use_input_precision_sbit, 0 );
if (fail(pm))
return;
#endif
}
}
}
}
}
#ifdef PNG_READ_16_TO_8_SUPPORTED
static void perform_gamma_strip16_tests(png_modifier *pm, int speed)
{
# ifndef PNG_MAX_GAMMA_8
# define PNG_MAX_GAMMA_8 11
# endif
unsigned int i, j;
for (i=0; i<pm->ngammas; ++i)
{
for (j=0; j<pm->ngammas; ++j)
{
if (i != j &&
fabs(pm->gammas[j]/pm->gammas[i]-1) >= PNG_GAMMA_THRESHOLD)
{
gamma_transform_test(pm, 0, 16, pm->interlace_type, 1/pm->gammas[i],
pm->gammas[j], PNG_MAX_GAMMA_8, speed,
pm->use_input_precision_16to8, 1 );
if (fail(pm))
return;
gamma_transform_test(pm, 2, 16, pm->interlace_type, 1/pm->gammas[i],
pm->gammas[j], PNG_MAX_GAMMA_8, speed,
pm->use_input_precision_16to8, 1 );
if (fail(pm))
return;
gamma_transform_test(pm, 4, 16, pm->interlace_type, 1/pm->gammas[i],
pm->gammas[j], PNG_MAX_GAMMA_8, speed,
pm->use_input_precision_16to8, 1 );
if (fail(pm))
return;
gamma_transform_test(pm, 6, 16, pm->interlace_type, 1/pm->gammas[i],
pm->gammas[j], PNG_MAX_GAMMA_8, speed,
pm->use_input_precision_16to8, 1 );
if (fail(pm))
return;
}
}
}
}
#endif
static void
perform_gamma_test(png_modifier *pm, int speed, int summary)
{
if (!speed && pm->test_gamma_threshold)
{
perform_gamma_threshold_tests(pm);
if (fail(pm))
return;
}
if (pm->test_gamma_transform)
{
perform_gamma_transform_tests(pm, speed);
if (summary)
{
printf("Gamma correction error summary\n\n");
printf("The printed value is the maximum error in the pixel values\n");
printf("calculated by the libpng gamma correction code. The error\n");
printf("is calculated as the difference between the output pixel\n");
printf("value (always an integer) and the ideal value from the\n");
printf("libpng specification (typically not an integer).\n\n");
printf("Expect this value to be less than .5 for 8 bit formats,\n");
printf("less than 1 for formats with fewer than 8 bits and a small\n");
printf("number (typically less than 5) for the 16 bit formats.\n");
printf("For performance reasons the value for 16 bit formats\n");
printf("increases when the image file includes an sBIT chunk.\n\n");
printf(" 2 bit gray: %.5f\n", pm->error_gray_2);
printf(" 4 bit gray: %.5f\n", pm->error_gray_4);
printf(" 8 bit gray: %.5f\n", pm->error_gray_8);
printf(" 8 bit color: %.5f\n", pm->error_color_8);
#ifdef DO_16BIT
printf(" 16 bit gray: %.5f\n", pm->error_gray_16);
printf(" 16 bit color: %.5f\n", pm->error_color_16);
#endif
}
}
if (pm->test_gamma_sbit)
{
pm->error_gray_2 = pm->error_gray_4 = pm->error_gray_8 =
pm->error_gray_16 = pm->error_color_8 = pm->error_color_16 = 0;
perform_gamma_sbit_tests(pm, speed);
if (summary)
{
printf("Gamma correction with sBIT:\n");
if (pm->sbitlow < 8U)
{
printf(" 2 bit gray: %.5f\n", pm->error_gray_2);
printf(" 4 bit gray: %.5f\n", pm->error_gray_4);
printf(" 8 bit gray: %.5f\n", pm->error_gray_8);
printf(" 8 bit color: %.5f\n", pm->error_color_8);
}
#ifdef DO_16BIT
printf(" 16 bit gray: %.5f\n", pm->error_gray_16);
printf(" 16 bit color: %.5f\n", pm->error_color_16);
#endif
}
}
#ifdef PNG_READ_16_TO_8_SUPPORTED
if (pm->test_gamma_strip16)
{
pm->error_gray_2 = pm->error_gray_4 = pm->error_gray_8 =
pm->error_gray_16 = pm->error_color_8 = pm->error_color_16 = 0;
perform_gamma_strip16_tests(pm, speed);
if (summary)
{
printf("Gamma correction with 16 to 8 bit reduction:\n");
printf(" 16 bit gray: %.5f\n", pm->error_gray_16);
printf(" 16 bit color: %.5f\n", pm->error_color_16);
}
}
#endif
}
static PNG_CONST
png_byte adam7[8][8] =
{
{ 1,6,4,6,2,6,4,6 },
{ 7,7,7,7,7,7,7,7 },
{ 5,6,5,6,5,6,5,6 },
{ 7,7,7,7,7,7,7,7 },
{ 3,6,4,6,3,6,4,6 },
{ 7,7,7,7,7,7,7,7 },
{ 5,6,5,6,5,6,5,6 },
{ 7,7,7,7,7,7,7,7 }
};
static png_uint_32
png_pass_start_row(int pass)
{
int x, y;
++pass;
for (y=0; y<8; ++y) for (x=0; x<8; ++x) if (adam7[y][x] == pass)
return y;
return 0xf;
}
static png_uint_32
png_pass_start_col(int pass)
{
int x, y;
++pass;
for (x=0; x<8; ++x) for (y=0; y<8; ++y) if (adam7[y][x] == pass)
return x;
return 0xf;
}
static int
png_pass_row_shift(int pass)
{
int x, y, base=(-1), inc=8;
++pass;
for (y=0; y<8; ++y) for (x=0; x<8; ++x) if (adam7[y][x] == pass)
{
if (base == (-1))
base = y;
else if (base == y)
{}
else if (inc == y-base)
base=y;
else if (inc == 8)
inc = y-base, base=y;
else if (inc != y-base)
return 0xff;
}
if (base == (-1)) return 0xfe;
switch (inc)
{
case 2: return 1;
case 4: return 2;
case 8: return 3;
default: break;
}
return (inc << 8) + 0xfd;
}
static int
png_pass_col_shift(int pass)
{
int x, y, base=(-1), inc=8;
++pass;
for (x=0; x<8; ++x) for (y=0; y<8; ++y) if (adam7[y][x] == pass)
{
if (base == (-1))
base = x;
else if (base == x)
{}
else if (inc == x-base)
base=x;
else if (inc == 8)
inc = x-base, base=x;
else if (inc != x-base)
return 0xff;
}
if (base == (-1)) return 0xfe;
switch (inc)
{
case 1: return 0;
case 2: return 1;
case 4: return 2;
case 8: return 3;
default: break;
}
return (inc << 8) + 0xfd;
}
static png_uint_32
png_row_from_pass_row(png_uint_32 yIn, int pass)
{
switch (pass)
{
case 0: return yIn * 8;
case 1: return yIn * 8;
case 2: return yIn * 8 + 4;
case 3: return yIn * 4;
case 4: return yIn * 4 + 2;
case 5: return yIn * 2;
case 6: return yIn * 2 + 1;
default: break;
}
return 0xff;
}
static png_uint_32
png_col_from_pass_col(png_uint_32 xIn, int pass)
{
switch (pass)
{
case 0: return xIn * 8;
case 1: return xIn * 8 + 4;
case 2: return xIn * 4;
case 3: return xIn * 4 + 2;
case 4: return xIn * 2;
case 5: return xIn * 2 + 1;
case 6: return xIn;
default: break;
}
return 0xff;
}
static int
png_row_in_interlace_pass(png_uint_32 y, int pass)
{
int x;
y &= 7;
++pass;
for (x=0; x<8; ++x) if (adam7[y][x] == pass)
return 1;
return 0;
}
static int
png_col_in_interlace_pass(png_uint_32 x, int pass)
{
int y;
x &= 7;
++pass;
for (y=0; y<8; ++y) if (adam7[y][x] == pass)
return 1;
return 0;
}
static png_uint_32
png_pass_rows(png_uint_32 height, int pass)
{
png_uint_32 tiles = height>>3;
png_uint_32 rows = 0;
unsigned int x, y;
height &= 7;
++pass;
for (y=0; y<8; ++y) for (x=0; x<8; ++x) if (adam7[y][x] == pass)
{
rows += tiles;
if (y < height) ++rows;
break;
}
return rows;
}
static png_uint_32
png_pass_cols(png_uint_32 width, int pass)
{
png_uint_32 tiles = width>>3;
png_uint_32 cols = 0;
unsigned int x, y;
width &= 7;
++pass;
for (x=0; x<8; ++x) for (y=0; y<8; ++y) if (adam7[y][x] == pass)
{
cols += tiles;
if (x < width) ++cols;
break;
}
return cols;
}
static void
perform_interlace_macro_validation(void)
{
int pass;
for (pass=0; pass<7; ++pass)
{
png_uint_32 m, f, v;
m = PNG_PASS_START_ROW(pass);
f = png_pass_start_row(pass);
if (m != f)
{
fprintf(stderr, "PNG_PASS_START_ROW(%d) = %u != %x\n", pass, m, f);
exit(1);
}
m = PNG_PASS_START_COL(pass);
f = png_pass_start_col(pass);
if (m != f)
{
fprintf(stderr, "PNG_PASS_START_COL(%d) = %u != %x\n", pass, m, f);
exit(1);
}
m = PNG_PASS_ROW_SHIFT(pass);
f = png_pass_row_shift(pass);
if (m != f)
{
fprintf(stderr, "PNG_PASS_ROW_SHIFT(%d) = %u != %x\n", pass, m, f);
exit(1);
}
m = PNG_PASS_COL_SHIFT(pass);
f = png_pass_col_shift(pass);
if (m != f)
{
fprintf(stderr, "PNG_PASS_COL_SHIFT(%d) = %u != %x\n", pass, m, f);
exit(1);
}
for (v=0;;)
{
m = PNG_ROW_FROM_PASS_ROW(v, pass);
f = png_row_from_pass_row(v, pass);
if (m != f)
{
fprintf(stderr, "PNG_ROW_FROM_PASS_ROW(%u, %d) = %u != %x\n",
v, pass, m, f);
exit(1);
}
m = PNG_COL_FROM_PASS_COL(v, pass);
f = png_col_from_pass_col(v, pass);
if (m != f)
{
fprintf(stderr, "PNG_COL_FROM_PASS_COL(%u, %d) = %u != %x\n",
v, pass, m, f);
exit(1);
}
m = PNG_ROW_IN_INTERLACE_PASS(v, pass);
f = png_row_in_interlace_pass(v, pass);
if (m != f)
{
fprintf(stderr, "PNG_ROW_IN_INTERLACE_PASS(%u, %d) = %u != %x\n",
v, pass, m, f);
exit(1);
}
m = PNG_COL_IN_INTERLACE_PASS(v, pass);
f = png_col_in_interlace_pass(v, pass);
if (m != f)
{
fprintf(stderr, "PNG_COL_IN_INTERLACE_PASS(%u, %d) = %u != %x\n",
v, pass, m, f);
exit(1);
}
++v;
m = PNG_PASS_ROWS(v, pass);
f = png_pass_rows(v, pass);
if (m != f)
{
fprintf(stderr, "PNG_PASS_ROWS(%u, %d) = %u != %x\n",
v, pass, m, f);
exit(1);
}
m = PNG_PASS_COLS(v, pass);
f = png_pass_cols(v, pass);
if (m != f)
{
fprintf(stderr, "PNG_PASS_COLS(%u, %d) = %u != %x\n",
v, pass, m, f);
exit(1);
}
if (v > 1024)
{
if (v == PNG_UINT_31_MAX)
break;
v = (v << 1) ^ v;
if (v >= PNG_UINT_31_MAX)
v = PNG_UINT_31_MAX-1;
}
}
}
}
int main(int argc, PNG_CONST char **argv)
{
volatile int summary = 1;
PNG_CONST char *volatile touch = NULL;
static double
gammas[]={2.2, 1.0, 2.2/1.45, 1.8, 1.5, 2.4, 2.5, 2.62, 2.9};
png_modifier pm;
context(&pm.this, fault);
modifier_init(&pm);
pm.this.image = malloc(2*TRANSFORM_IMAGEMAX+1);
if (pm.this.image != NULL)
{
++(pm.this.image);
pm.this.cb_image = 2*TRANSFORM_IMAGEMAX;
}
pm.this.treat_warnings_as_errors = 1;
pm.gammas = gammas;
pm.ngammas = 0;
pm.sbitlow = 8U;
pm.use_input_precision_16to8 = 1U;
pm.maxout8 = .1;
pm.maxabs8 = .00005;
pm.maxpc8 = .499;
pm.maxout16 = .499;
pm.maxabs16 = .00005;
pm.maxpc16 = .005;
while (--argc >= 1)
{
if (strcmp(*++argv, "-v") == 0)
pm.this.verbose = 1;
else if (strcmp(*argv, "-l") == 0)
pm.log = 1;
else if (strcmp(*argv, "-q") == 0)
summary = pm.this.verbose = pm.log = 0;
else if (strcmp(*argv, "-w") == 0)
pm.this.treat_warnings_as_errors = 0;
else if (strcmp(*argv, "--speed") == 0)
pm.this.speed = 1, pm.ngammas = (sizeof gammas)/(sizeof gammas[0]),
pm.test_standard = 0;
else if (strcmp(*argv, "--size") == 0)
pm.test_size = 1;
else if (strcmp(*argv, "--nosize") == 0)
pm.test_size = 0;
else if (strcmp(*argv, "--standard") == 0)
pm.test_standard = 1;
else if (strcmp(*argv, "--nostandard") == 0)
pm.test_standard = 0;
else if (strcmp(*argv, "--transform") == 0)
pm.test_transform = 1;
else if (strcmp(*argv, "--notransform") == 0)
pm.test_transform = 0;
else if (strncmp(*argv, "--transform-disable=",
sizeof "--transform-disable") == 0)
{
pm.test_transform = 1;
transform_disable(*argv + sizeof "--transform-disable");
}
else if (strncmp(*argv, "--transform-enable=",
sizeof "--transform-enable") == 0)
{
pm.test_transform = 1;
transform_enable(*argv + sizeof "--transform-enable");
}
else if (strcmp(*argv, "--gamma") == 0)
{
pm.ngammas = 2U;
pm.test_gamma_threshold = 1;
pm.test_gamma_transform = 1;
pm.test_gamma_sbit = 1;
pm.test_gamma_strip16 = 1;
}
else if (strcmp(*argv, "--nogamma") == 0)
pm.ngammas = 0;
else if (strcmp(*argv, "--gamma-threshold") == 0)
pm.ngammas = 2U, pm.test_gamma_threshold = 1;
else if (strcmp(*argv, "--nogamma-threshold") == 0)
pm.test_gamma_threshold = 0;
else if (strcmp(*argv, "--gamma-transform") == 0)
pm.ngammas = 2U, pm.test_gamma_transform = 1;
else if (strcmp(*argv, "--nogamma-transform") == 0)
pm.test_gamma_transform = 0;
else if (strcmp(*argv, "--gamma-sbit") == 0)
pm.ngammas = 2U, pm.test_gamma_sbit = 1;
else if (strcmp(*argv, "--nogamma-sbit") == 0)
pm.test_gamma_sbit = 0;
else if (strcmp(*argv, "--gamma-16-to-8") == 0)
pm.ngammas = 2U, pm.test_gamma_strip16 = 1;
else if (strcmp(*argv, "--nogamma-16-to-8") == 0)
pm.test_gamma_strip16 = 0;
else if (strcmp(*argv, "--all-gammas") == 0)
pm.ngammas = (sizeof gammas)/(sizeof gammas[0]);
else if (strcmp(*argv, "--progressive-read") == 0)
pm.this.progressive = 1;
else if (strcmp(*argv, "--interlace") == 0)
pm.interlace_type = PNG_INTERLACE_ADAM7;
else if (argc >= 1 && strcmp(*argv, "--sbitlow") == 0)
--argc, pm.sbitlow = (png_byte)atoi(*++argv);
else if (argc >= 1 && strcmp(*argv, "--touch") == 0)
--argc, touch = *++argv;
else if (argc >= 1 && strncmp(*argv, "--max", 4) == 0)
{
--argc;
if (strcmp(4+*argv, "abs8") == 0)
pm.maxabs8 = atof(*++argv);
else if (strcmp(4+*argv, "abs16") == 0)
pm.maxabs16 = atof(*++argv);
else if (strcmp(4+*argv, "out8") == 0)
pm.maxout8 = atof(*++argv);
else if (strcmp(4+*argv, "out16") == 0)
pm.maxout16 = atof(*++argv);
else if (strcmp(4+*argv, "pc8") == 0)
pm.maxpc8 = atof(*++argv);
else if (strcmp(4+*argv, "pc16") == 0)
pm.maxpc16 = atof(*++argv);
else
{
fprintf(stderr, "pngvalid: %s: unknown 'max' option\n", *argv);
exit(1);
}
}
else
{
fprintf(stderr, "pngvalid: %s: unknown argument\n", *argv);
exit(1);
}
}
if (pm.test_standard == 0 && pm.test_size == 0 && pm.test_transform == 0 &&
pm.ngammas == 0)
{
pm.test_standard = 1;
pm.test_size = 1;
pm.test_transform = 1;
pm.ngammas = 3U;
}
if (pm.ngammas > 0 &&
pm.test_gamma_threshold == 0 && pm.test_gamma_transform == 0 &&
pm.test_gamma_sbit == 0 && pm.test_gamma_strip16 == 0)
{
pm.test_gamma_threshold = 1;
pm.test_gamma_transform = 1;
pm.test_gamma_sbit = 1;
pm.test_gamma_strip16 = 1;
}
else if (pm.ngammas == 0)
{
pm.test_gamma_threshold = 0;
pm.test_gamma_transform = 0;
pm.test_gamma_sbit = 0;
pm.test_gamma_strip16 = 0;
}
Try
{
make_transform_images(&pm.this);
if (pm.test_standard)
{
perform_interlace_macro_validation();
perform_standard_test(&pm);
perform_error_test(&pm);
}
if (pm.test_size)
{
make_size_images(&pm.this);
perform_size_test(&pm);
}
if (pm.test_transform)
perform_transform_test(&pm);
if (pm.ngammas > 0)
perform_gamma_test(&pm, pm.this.speed != 0,
summary && !pm.this.speed);
}
Catch(fault)
{
fprintf(stderr, "pngvalid: test aborted (probably failed in cleanup)\n");
if (!pm.this.verbose)
{
if (pm.this.error[0] != 0)
fprintf(stderr, "pngvalid: first error: %s\n", pm.this.error);
fprintf(stderr, "pngvalid: run with -v to see what happened\n");
}
exit(1);
}
if (summary && !pm.this.speed)
{
printf("Results using %s point arithmetic %s\n",
#if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || PNG_LIBPNG_VER < 10500
"floating",
#else
"fixed",
#endif
(pm.this.nerrors || (pm.this.treat_warnings_as_errors &&
pm.this.nwarnings)) ? "(errors)" : (pm.this.nwarnings ?
"(warnings)" : "(no errors or warnings)")
);
printf("Allocated memory statistics (in bytes):\n"
"\tread %lu maximum single, %lu peak, %lu total\n"
"\twrite %lu maximum single, %lu peak, %lu total\n",
(unsigned long)pm.this.read_memory_pool.max_max,
(unsigned long)pm.this.read_memory_pool.max_limit,
(unsigned long)pm.this.read_memory_pool.max_total,
(unsigned long)pm.this.write_memory_pool.max_max,
(unsigned long)pm.this.write_memory_pool.max_limit,
(unsigned long)pm.this.write_memory_pool.max_total);
}
store_delete(&pm.this);
if (pm.this.nerrors || (pm.this.treat_warnings_as_errors &&
pm.this.nwarnings))
{
if (!pm.this.verbose)
fprintf(stderr, "pngvalid: %s\n", pm.this.error);
fprintf(stderr, "pngvalid: %d errors, %d warnings\n", pm.this.nerrors,
pm.this.nwarnings);
exit(1);
}
if (touch != NULL)
{
FILE *fsuccess = fopen(touch, "wt");
if (fsuccess != NULL)
{
int error = 0;
fprintf(fsuccess, "PNG validation succeeded\n");
fflush(fsuccess);
error = ferror(fsuccess);
if (fclose(fsuccess) || error)
{
fprintf(stderr, "%s: write failed\n", touch);
exit(1);
}
}
}
return 0;
}