ft-show-glyphs-positioning.c [plain text]
#include "cairo-test.h"
#include <cairo-ft.h>
#define TEXT_SIZE 12
typedef struct {
cairo_glyph_t glyph_list[100];
int num_glyphs;
double x;
double y;
} glyph_array_t;
static void
glyph_array_init (glyph_array_t *glyphs, double x, double y)
{
glyphs->num_glyphs = 0;
glyphs->x = x;
glyphs->y = y;
}
static void
glyph_array_rel_move_to (glyph_array_t *glyphs, double x, double y)
{
glyphs->x += x;
glyphs->y += y;
}
static void
glyph_array_show (glyph_array_t *glyphs, cairo_t *cr)
{
cairo_show_glyphs (cr, glyphs->glyph_list, glyphs->num_glyphs);
}
#define DOUBLE_FROM_26_6(t) ((double)(t) / 64.0)
static cairo_status_t
glyph_array_add_text(glyph_array_t *glyphs, cairo_t *cr, const char *s, double spacing)
{
cairo_scaled_font_t *scaled_font;
cairo_status_t status;
FT_Face face;
unsigned long charcode;
unsigned int index;
cairo_text_extents_t extents;
const char *p;
FT_Vector kerning;
double kern_x;
int first = TRUE;
scaled_font = cairo_get_scaled_font (cr);
status = cairo_scaled_font_status (scaled_font);
if (status)
return status;
face = cairo_ft_scaled_font_lock_face (scaled_font);
if (face == NULL)
return CAIRO_STATUS_FONT_TYPE_MISMATCH;
p = s;
while (*p)
{
charcode = *p;
index = FT_Get_Char_Index (face, charcode);
glyphs->glyph_list[glyphs->num_glyphs].index = index;
if (first) {
first = FALSE;
glyphs->glyph_list[glyphs->num_glyphs].x = glyphs->x;
glyphs->glyph_list[glyphs->num_glyphs].y = glyphs->y;
} else {
cairo_glyph_extents (cr, &glyphs->glyph_list[glyphs->num_glyphs - 1], 1, &extents);
FT_Get_Kerning (face,
glyphs->glyph_list[glyphs->num_glyphs - 1].index,
glyphs->glyph_list[glyphs->num_glyphs].index,
FT_KERNING_UNSCALED,
&kerning);
kern_x = DOUBLE_FROM_26_6(kerning.x);
glyphs->glyph_list[glyphs->num_glyphs].x =
glyphs->glyph_list[glyphs->num_glyphs - 1].x + extents.x_advance + kern_x + spacing;
glyphs->glyph_list[glyphs->num_glyphs].y =
glyphs->glyph_list[glyphs->num_glyphs - 1].y + extents.y_advance;
}
cairo_glyph_extents (cr, &glyphs->glyph_list[glyphs->num_glyphs], 1, &extents);
glyphs->x = glyphs->glyph_list[glyphs->num_glyphs].x + extents.x_advance + spacing;
glyphs->y = glyphs->glyph_list[glyphs->num_glyphs].y + extents.y_advance;
p++;
glyphs->num_glyphs++;
}
cairo_ft_scaled_font_unlock_face (scaled_font);
return CAIRO_STATUS_SUCCESS;
}
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
const cairo_test_context_t *ctx = cairo_test_get_context (cr);
glyph_array_t glyphs;
cairo_font_options_t *font_options;
cairo_status_t status;
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
cairo_paint (cr);
cairo_select_font_face (cr, CAIRO_TEST_FONT_FAMILY " Sans",
CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_NORMAL);
cairo_set_font_size (cr, TEXT_SIZE);
font_options = cairo_font_options_create ();
cairo_get_font_options (cr, font_options);
cairo_font_options_set_hint_metrics (font_options, CAIRO_HINT_METRICS_OFF);
cairo_set_font_options (cr, font_options);
cairo_font_options_destroy (font_options);
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
glyph_array_init (&glyphs, 1, TEXT_SIZE);
status = glyph_array_add_text(&glyphs, cr, "AWAY again", 0.0);
if (status)
return cairo_test_status_from_status (ctx, status);
glyph_array_rel_move_to (&glyphs, TEXT_SIZE*1, 0.0);
status = glyph_array_add_text(&glyphs, cr, "character space", TEXT_SIZE*0.3);
if (status)
return cairo_test_status_from_status (ctx, status);
glyph_array_show (&glyphs, cr);
glyph_array_init (&glyphs, 1, TEXT_SIZE*2 + 4);
status = glyph_array_add_text(&glyphs, cr, "Increasing", 0.0);
if (status)
return cairo_test_status_from_status (ctx, status);
glyph_array_rel_move_to (&glyphs, TEXT_SIZE*0.5, 0.0);
status = glyph_array_add_text(&glyphs, cr, "space", 0.0);
if (status)
return cairo_test_status_from_status (ctx, status);
glyph_array_rel_move_to (&glyphs, TEXT_SIZE*1.0, 0.0);
status = glyph_array_add_text(&glyphs, cr, "between", 0.0);
if (status)
return cairo_test_status_from_status (ctx, status);
glyph_array_rel_move_to (&glyphs, TEXT_SIZE*1.5, 0.0);
status = glyph_array_add_text(&glyphs, cr, "words", 0.0);
if (status)
return cairo_test_status_from_status (ctx, status);
glyph_array_show (&glyphs, cr);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (ft_show_glyphs_positioning,
"Test that the PS/PDF glyph positioning optimizations are correct",
"ft, text",
NULL,
235, (TEXT_SIZE + 4)*2,
NULL, draw)