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Decoding webp, depends on source image data alpha status.

This commit is contained in:
flexih 2014-10-23 12:14:43 +08:00
parent d2da4d0df4
commit 83ad6fa977
1 changed files with 8 additions and 3 deletions
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11
SDWebImage/UIImage+WebP.m
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@ -24,7 +24,11 @@ static void FreeImageData(void *info, const void *data, size_t size)
return nil;
}
config.output.colorspace = MODE_rgbA;
if (WebPGetFeatures(data.bytes, data.length, &config.input) != VP8_STATUS_OK) {
return nil;
}
config.output.colorspace = config.input.has_alpha ? MODE_rgbA : MODE_RGB;
config.options.use_threads = 1;
// Decode the WebP image data into a RGBA value array.
@ -43,9 +47,10 @@ static void FreeImageData(void *info, const void *data, size_t size)
CGDataProviderRef provider =
CGDataProviderCreateWithData(NULL, config.output.u.RGBA.rgba, config.output.u.RGBA.size, FreeImageData);
CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
CGBitmapInfo bitmapInfo = kCGBitmapByteOrder32Big | kCGImageAlphaPremultipliedLast;
CGBitmapInfo bitmapInfo = config.input.has_alpha ? kCGBitmapByteOrder32Big | kCGImageAlphaPremultipliedLast : 0;
size_t components = config.input.has_alpha ? 4 : 3;
CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault;
CGImageRef imageRef = CGImageCreate(width, height, 8, 32, 4 * width, colorSpaceRef, bitmapInfo, provider, NULL, NO, renderingIntent);
CGImageRef imageRef = CGImageCreate(width, height, 8, components * 8, components * width, colorSpaceRef, bitmapInfo, provider, NULL, NO, renderingIntent);
CGColorSpaceRelease(colorSpaceRef);
CGDataProviderRelease(provider);