bool SkImageDecoder_CG::onDecode(SkStream* stream, SkBitmap* bm, Mode mode) {
CGImageSourceRef imageSrc = SkStreamToCGImageSource(stream);
if (NULL == imageSrc) {
return false;
}
SkAutoTCallVProc<const void, CFRelease> arsrc(imageSrc);
CGImageRef image = CGImageSourceCreateImageAtIndex(imageSrc, 0, NULL);
if (NULL == image) {
return false;
}
SkAutoTCallVProc<CGImage, CGImageRelease> arimage(image);
const int width = SkToInt(CGImageGetWidth(image));
const int height = SkToInt(CGImageGetHeight(image));
bm->setInfo(SkImageInfo::MakeN32Premul(width, height));
if (SkImageDecoder::kDecodeBounds_Mode == mode) {
return true;
}
if (!this->allocPixelRef(bm, NULL)) {
return false;
}
SkAutoLockPixels alp(*bm);
if (!SkCopyPixelsFromCGImage(bm->info(), bm->rowBytes(), bm->getPixels(), image)) {
return false;
}
CGImageAlphaInfo info = CGImageGetAlphaInfo(image);
switch (info) {
case kCGImageAlphaNone:
case kCGImageAlphaNoneSkipLast:
case kCGImageAlphaNoneSkipFirst:
SkASSERT(SkBitmap::ComputeIsOpaque(*bm));
bm->setAlphaType(kOpaque_SkAlphaType);
break;
default:
// we don't know if we're opaque or not, so compute it.
if (SkBitmap::ComputeIsOpaque(*bm)) {
bm->setAlphaType(kOpaque_SkAlphaType);
}
}
if (!bm->isOpaque() && this->getRequireUnpremultipliedColors()) {
// CGBitmapContext does not support unpremultiplied, so the image has been premultiplied.
// Convert to unpremultiplied.
for (int i = 0; i < width; ++i) {
for (int j = 0; j < height; ++j) {
uint32_t* addr = bm->getAddr32(i, j);
*addr = SkUnPreMultiply::UnPreMultiplyPreservingByteOrder(*addr);
}
}
bm->setAlphaType(kUnpremul_SkAlphaType);
}
return true;
}
bool SkImageDecoder_CG::onDecode(SkStream* stream, SkBitmap* bm, Mode mode) {
CGImageSourceRef imageSrc = SkStreamToCGImageSource(stream);
if (NULL == imageSrc) {
return false;
}
SkAutoTCallVProc<const void, CFRelease> arsrc(imageSrc);
CGImageRef image = CGImageSourceCreateImageAtIndex(imageSrc, 0, NULL);
if (NULL == image) {
return false;
}
SkAutoTCallVProc<CGImage, CGImageRelease> arimage(image);
const int width = CGImageGetWidth(image);
const int height = CGImageGetHeight(image);
bm->setConfig(SkBitmap::kARGB_8888_Config, width, height);
if (SkImageDecoder::kDecodeBounds_Mode == mode) {
return true;
}
if (!this->allocPixelRef(bm, NULL)) {
return false;
}
bm->lockPixels();
bm->eraseColor(SK_ColorTRANSPARENT);
// use the same colorspace, so we don't change the pixels at all
CGColorSpaceRef cs = CGImageGetColorSpace(image);
CGContextRef cg = CGBitmapContextCreate(bm->getPixels(), width, height, 8, bm->rowBytes(), cs, BITMAP_INFO);
if (NULL == cg) {
// perhaps the image's colorspace does not work for a context, so try just rgb
cs = CGColorSpaceCreateDeviceRGB();
cg = CGBitmapContextCreate(bm->getPixels(), width, height, 8, bm->rowBytes(), cs, BITMAP_INFO);
CFRelease(cs);
}
CGContextDrawImage(cg, CGRectMake(0, 0, width, height), image);
CGContextRelease(cg);
CGImageAlphaInfo info = CGImageGetAlphaInfo(image);
switch (info) {
case kCGImageAlphaNone:
case kCGImageAlphaNoneSkipLast:
case kCGImageAlphaNoneSkipFirst:
SkASSERT(SkBitmap::ComputeIsOpaque(*bm));
bm->setIsOpaque(true);
break;
default:
// we don't know if we're opaque or not, so compute it.
bm->computeAndSetOpaquePredicate();
}
bm->unlockPixels();
return true;
}
bool SkImageDecoder_CG::onDecode(SkStream* stream, SkBitmap* bm, Mode mode) {
CGImageSourceRef imageSrc = SkStreamToCGImageSource(stream);
if (NULL == imageSrc) {
return false;
}
SkAutoTCallVProc<const void, CFRelease> arsrc(imageSrc);
CGImageRef image = CGImageSourceCreateImageAtIndex(imageSrc, 0, NULL);
if (NULL == image) {
return false;
}
SkAutoTCallVProc<CGImage, CGImageRelease> arimage(image);
const int width = CGImageGetWidth(image);
const int height = CGImageGetHeight(image);
bm->setConfig(SkBitmap::kARGB_8888_Config, width, height);
if (SkImageDecoder::kDecodeBounds_Mode == mode) {
return true;
}
if (!this->allocPixelRef(bm, NULL)) {
return false;
}
bm->lockPixels();
bm->eraseColor(0);
// use the same colorspace, so we don't change the pixels at all
CGColorSpaceRef cs = CGImageGetColorSpace(image);
CGContextRef cg = CGBitmapContextCreate(bm->getPixels(), width, height,
8, bm->rowBytes(), cs, BITMAP_INFO);
CGContextDrawImage(cg, CGRectMake(0, 0, width, height), image);
CGContextRelease(cg);
bm->unlockPixels();
return true;
}
bool SkImageDecoder_CG::onDecode(SkStream* stream, SkBitmap* bm, Mode mode) {
CGImageSourceRef imageSrc = SkStreamToCGImageSource(stream);
if (NULL == imageSrc) {
return false;
}
SkAutoTCallVProc<const void, CFRelease> arsrc(imageSrc);
CGImageRef image = CGImageSourceCreateImageAtIndex(imageSrc, 0, NULL);
if (NULL == image) {
return false;
}
SkAutoTCallVProc<CGImage, CGImageRelease> arimage(image);
const int width = SkToInt(CGImageGetWidth(image));
const int height = SkToInt(CGImageGetHeight(image));
bm->setConfig(SkBitmap::kARGB_8888_Config, width, height);
if (SkImageDecoder::kDecodeBounds_Mode == mode) {
return true;
}
if (!this->allocPixelRef(bm, NULL)) {
return false;
}
bm->lockPixels();
bm->eraseColor(SK_ColorTRANSPARENT);
CGColorSpaceRef cs = CGColorSpaceCreateDeviceRGB();
CGContextRef cg = CGBitmapContextCreate(bm->getPixels(), width, height, 8, bm->rowBytes(), cs, BITMAP_INFO);
CFRelease(cs);
CGContextDrawImage(cg, CGRectMake(0, 0, width, height), image);
CGContextRelease(cg);
CGImageAlphaInfo info = CGImageGetAlphaInfo(image);
switch (info) {
case kCGImageAlphaNone:
case kCGImageAlphaNoneSkipLast:
case kCGImageAlphaNoneSkipFirst:
SkASSERT(SkBitmap::ComputeIsOpaque(*bm));
bm->setAlphaType(kOpaque_SkAlphaType);
break;
default:
// we don't know if we're opaque or not, so compute it.
if (SkBitmap::ComputeIsOpaque(*bm)) {
bm->setAlphaType(kOpaque_SkAlphaType);
}
}
if (!bm->isOpaque() && this->getRequireUnpremultipliedColors()) {
// CGBitmapContext does not support unpremultiplied, so the image has been premultiplied.
// Convert to unpremultiplied.
for (int i = 0; i < width; ++i) {
for (int j = 0; j < height; ++j) {
uint32_t* addr = bm->getAddr32(i, j);
*addr = SkUnPreMultiply::UnPreMultiplyPreservingByteOrder(*addr);
}
}
bm->setAlphaType(kUnpremul_SkAlphaType);
}
bm->unlockPixels();
return true;
}
