ImageSourceMac.cpp [plain text]
#include "config.h"
#include "ImageSource.h"
#include <CoreGraphics/CGImageSourcePrivate.h>
#include "IntSize.h"
namespace WebCore {
ImageSource::ImageSource()
: m_decoder(0), m_isSubsampled(false)
{
}
ImageSource::~ImageSource()
{
clear();
}
void ImageSource::clear()
{
if (m_decoder) {
CFRelease(m_decoder);
m_decoder = 0;
}
}
const CFStringRef kCGImageSourceShouldPreferRGB32 = CFSTR("kCGImageSourceShouldPreferRGB32");
CFDictionaryRef ImageSource::imageSourceOptions() const
{
static CFDictionaryRef options;
if (!options) {
const void *keys[2] = { kCGImageSourceShouldCache, kCGImageSourceShouldPreferRGB32 };
const void *values[2] = { kCFBooleanTrue, kCFBooleanTrue };
options = CFDictionaryCreate(NULL, keys, values, 2,
&kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
}
if (m_isSubsampled) {
static CFDictionaryRef subsampledOptions;
if (!subsampledOptions) {
const void *keys[3] = { kCGImageSourceShouldCache, kCGImageSourceShouldPreferRGB32, kCGImageSourceSubsampleFactor };
static int subsampleFactor = 4;
static CFNumberRef subsampleFactorNum = CFNumberCreate(NULL, kCFNumberIntType, &subsampleFactor);
const void *values[3] = { kCFBooleanTrue, kCFBooleanTrue, subsampleFactorNum };
subsampledOptions = CFDictionaryCreate(NULL, keys, values, 3,
&kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
}
return subsampledOptions;
}
return options;
}
bool ImageSource::initialized() const
{
return m_decoder;
}
void ImageSource::setData(NativeBytePtr data, bool allDataReceived)
{
if (!m_decoder)
m_decoder = CGImageSourceCreateIncremental(NULL);
CGImageSourceUpdateData(m_decoder, data, allDataReceived);
}
bool ImageSource::isSizeAvailable()
{
bool result = false;
CGImageSourceStatus imageSourceStatus = CGImageSourceGetStatus(m_decoder);
if (imageSourceStatus >= kCGImageStatusIncomplete) {
CFDictionaryRef image0Properties = CGImageSourceCopyPropertiesAtIndex(m_decoder, 0, imageSourceOptions());
if (image0Properties) {
CFNumberRef widthNumber = (CFNumberRef)CFDictionaryGetValue(image0Properties, kCGImagePropertyPixelWidth);
CFNumberRef heightNumber = (CFNumberRef)CFDictionaryGetValue(image0Properties, kCGImagePropertyPixelHeight);
result = widthNumber && heightNumber;
CFRelease(image0Properties);
}
}
return result;
}
IntSize ImageSource::size() const
{
IntSize result;
bool isProgressive = false;
CFDictionaryRef properties = CGImageSourceCopyPropertiesAtIndex(m_decoder, 0, imageSourceOptions());
if (properties) {
int w = 0, h = 0;
CFNumberRef num = (CFNumberRef)CFDictionaryGetValue(properties, kCGImagePropertyPixelWidth);
if (num)
CFNumberGetValue(num, kCFNumberIntType, &w);
num = (CFNumberRef)CFDictionaryGetValue(properties, kCGImagePropertyPixelHeight);
if (num)
CFNumberGetValue(num, kCFNumberIntType, &h);
result = IntSize(w, h);
CFDictionaryRef jfifProperties = (CFDictionaryRef)CFDictionaryGetValue(properties, kCGImagePropertyJFIFDictionary);
if (jfifProperties) {
CFBooleanRef isProgCFBool = (CFBooleanRef)CFDictionaryGetValue(jfifProperties, kCGImagePropertyJFIFIsProgressive);
if (isProgCFBool)
isProgressive = CFBooleanGetValue(isProgCFBool);
}
CFRelease(properties);
}
if (!m_isSubsampled && !isProgressive) {
if (result.width() * result.height() > 2000000) {
m_isSubsampled = true;
result = size();
}
}
return result;
}
int ImageSource::repetitionCount()
{
int result = cAnimationLoopOnce;
CFDictionaryRef properties = CGImageSourceCopyProperties(m_decoder, imageSourceOptions());
if (properties) {
CFDictionaryRef gifProperties = (CFDictionaryRef)CFDictionaryGetValue(properties, kCGImagePropertyGIFDictionary);
if (gifProperties) {
CFNumberRef num = (CFNumberRef)CFDictionaryGetValue(gifProperties, kCGImagePropertyGIFLoopCount);
if (num)
CFNumberGetValue(num, kCFNumberIntType, &result);
} else
result = cAnimationNone;
CFRelease(properties);
}
return result;
}
size_t ImageSource::frameCount() const
{
return m_decoder ? CGImageSourceGetCount(m_decoder) : 0;
}
CGImageRef ImageSource::createFrameAtIndex(size_t index)
{
return CGImageSourceCreateImageAtIndex(m_decoder, index, imageSourceOptions());
}
void ImageSource::destroyFrameAtIndex(size_t index)
{
CGImageRef image = CGImageSourceCreateImageAtIndex(m_decoder, index, NULL);
CGImageRelease(image);
}
bool ImageSource::frameIsCompleteAtIndex(size_t index)
{
return CGImageSourceGetStatusAtIndex(m_decoder, index) == kCGImageStatusComplete;
}
float ImageSource::frameDurationAtIndex(size_t index)
{
float duration = 0;
CFDictionaryRef properties = CGImageSourceCopyPropertiesAtIndex(m_decoder, index, imageSourceOptions());
if (properties) {
CFDictionaryRef typeProperties = (CFDictionaryRef)CFDictionaryGetValue(properties, kCGImagePropertyGIFDictionary);
if (typeProperties) {
CFNumberRef num = (CFNumberRef)CFDictionaryGetValue(typeProperties, kCGImagePropertyGIFDelayTime);
if (num)
CFNumberGetValue(num, kCFNumberFloatType, &duration);
}
CFRelease(properties);
}
if (duration <= 0.010)
return 0.100;
return duration;
}
bool ImageSource::frameHasAlphaAtIndex(size_t index)
{
return true;
}
}