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Support to provide the background color when you encode a alpha UIImage into non-alpha format like JPEG

This commit is contained in:
DreamPiggy 2020-04-03 22:52:43 +08:00
parent 374b3f7981
commit 2ca731c2e8
4 changed files with 17 additions and 0 deletions
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6
SDWebImage/Core/SDImageCoder.h
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@ -55,6 +55,12 @@ FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderEncodeFirstFrame
*/
FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderEncodeCompressionQuality;
/**
A UIColor(NSColor) value to used for non-alpha image encoding when the input image has alpha channel, the background color will be used to compose the alpha one. If not provide, use white color.
@note works for `SDImageEncoder`
*/
FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderEncodeBackgroundColor;
/**
A SDWebImageContext object which hold the original context options from top-level API. (SDWebImageContext)
This option is ignored for all built-in coders and take no effect.

1
SDWebImage/Core/SDImageCoder.m
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@ -15,5 +15,6 @@ SDImageCoderOption const SDImageCoderDecodeThumbnailPixelSize = @"decodeThumbnai
SDImageCoderOption const SDImageCoderEncodeFirstFrameOnly = @"encodeFirstFrameOnly";
SDImageCoderOption const SDImageCoderEncodeCompressionQuality = @"encodeCompressionQuality";
SDImageCoderOption const SDImageCoderEncodeBackgroundColor = @"encodeBackgroundColor";
SDImageCoderOption const SDImageCoderWebImageContext = @"webImageContext";

5
SDWebImage/Core/SDImageIOAnimatedCoder.m
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@ -426,11 +426,16 @@ static NSString * kSDCGImageSourceRasterizationDPI = @"kCGImageSourceRasterizati
return nil;
}
NSMutableDictionary *properties = [NSMutableDictionary dictionary];
// Encoding Options
double compressionQuality = 1;
if (options[SDImageCoderEncodeCompressionQuality]) {
compressionQuality = [options[SDImageCoderEncodeCompressionQuality] doubleValue];
}
properties[(__bridge NSString *)kCGImageDestinationLossyCompressionQuality] = @(compressionQuality);
CGColorRef backgroundColor = [options[SDImageCoderEncodeBackgroundColor] CGColor];
if (backgroundColor) {
properties[(__bridge NSString *)kCGImageDestinationBackgroundColor] = (__bridge id)(backgroundColor);
}
BOOL encodeFirstFrame = [options[SDImageCoderEncodeFirstFrameOnly] boolValue];
if (encodeFirstFrame || frames.count == 0) {

5
SDWebImage/Core/SDImageIOCoder.m
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@ -248,11 +248,16 @@
CGImagePropertyOrientation exifOrientation = kCGImagePropertyOrientationUp;
#endif
properties[(__bridge NSString *)kCGImagePropertyOrientation] = @(exifOrientation);
// Encoding Options
double compressionQuality = 1;
if (options[SDImageCoderEncodeCompressionQuality]) {
compressionQuality = [options[SDImageCoderEncodeCompressionQuality] doubleValue];
}
properties[(__bridge NSString *)kCGImageDestinationLossyCompressionQuality] = @(compressionQuality);
CGColorRef backgroundColor = [options[SDImageCoderEncodeBackgroundColor] CGColor];
if (backgroundColor) {
properties[(__bridge NSString *)kCGImageDestinationBackgroundColor] = (__bridge id)(backgroundColor);
}
// Add your image to the destination.
CGImageDestinationAddImage(imageDestination, image.CGImage, (__bridge CFDictionaryRef)properties);