bool DecodingImageGenerator::getPixels(const SkImageInfo& info,
void* pixels,
size_t rowBytes) {
if (NULL == pixels) {
return false;
}
if (fInfo != info) {
// The caller has specified a different info. This is an
// error for this kind of SkImageGenerator. Use the Options
// to change the settings.
return false;
}
if (info.minRowBytes() > rowBytes) {
// The caller has specified a bad rowBytes.
return false;
}
SkAssertResult(fStream->rewind());
SkAutoTDelete<SkImageDecoder> decoder(SkImageDecoder::Factory(fStream));
if (NULL == decoder.get()) {
return false;
}
decoder->setDitherImage(fDitherImage);
decoder->setSampleSize(fSampleSize);
decoder->setRequireUnpremultipliedColors(
info.fAlphaType == kUnpremul_SkAlphaType);
SkBitmap bitmap;
TargetAllocator allocator(fInfo, pixels, rowBytes);
decoder->setAllocator(&allocator);
// TODO: need to be able to pass colortype directly to decoder
SkBitmap::Config legacyConfig = SkColorTypeToBitmapConfig(info.colorType());
bool success = decoder->decode(fStream, &bitmap, legacyConfig,
SkImageDecoder::kDecodePixels_Mode);
decoder->setAllocator(NULL);
if (!success) {
return false;
}
if (allocator.isReady()) { // Did not use pixels!
SkBitmap bm;
SkASSERT(bitmap.canCopyTo(info.colorType()));
bool copySuccess = bitmap.copyTo(&bm, info.colorType(), &allocator);
if (!copySuccess || allocator.isReady()) {
SkDEBUGFAIL("bitmap.copyTo(requestedConfig) failed.");
// Earlier we checked canCopyto(); we expect consistency.
return false;
}
SkASSERT(check_alpha(info.alphaType(), bm.alphaType()));
} else {
SkASSERT(check_alpha(info.alphaType(), bitmap.alphaType()));
}
return true;
}
static int check_alnum(int c) { return check_alpha(c) || check_digit(c); }
inline bool check_dist(const char* function, const RealType& alpha, const RealType& beta, RealType* result, const Policy& pol)
{ // Check both alpha and beta.
return check_alpha(function, alpha, result, pol)
&& check_beta(function, beta, result, pol);
} // bool check_dist
