mirrors
/
SDWebImage
mirror of https://github.com/SDWebImage/SDWebImage.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Supports the encoding max pixel size options as well, which let the codec to do thumbnail rescale encoding, better performance than transformer to scale and then encode

This commit is contained in:
DreamPiggy 2020-04-03 23:28:08 +08:00
parent 2ca731c2e8
commit e71bbf239c
4 changed files with 67 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
SDWebImage/Core/SDImageCoder.h
View File

@ -57,10 +57,17 @@ FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderEncodeCompressio
/**
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`
@note works for `SDImageCoder`
*/
FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderEncodeBackgroundColor;
/**
A CGSize value indicating the max image resolution in pixels during encoding. For vector image, this also effect the output vector data information about width and height. The encoder will not generate the encoded image larger than this limit. Note it always use the aspect ratio of input image.
Defaults to CGSizeZero, which means no max size limit at all.
@note works for `SDImageCoder`
*/
FOUNDATION_EXPORT SDImageCoderOption _Nonnull const SDImageCoderEncodeMaxPixelSize;
/**
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
View File

@ -16,5 +16,6 @@ SDImageCoderOption const SDImageCoderDecodeThumbnailPixelSize = @"decodeThumbnai
SDImageCoderOption const SDImageCoderEncodeFirstFrameOnly = @"encodeFirstFrameOnly";
SDImageCoderOption const SDImageCoderEncodeCompressionQuality = @"encodeCompressionQuality";
SDImageCoderOption const SDImageCoderEncodeBackgroundColor = @"encodeBackgroundColor";
SDImageCoderOption const SDImageCoderEncodeMaxPixelSize = @"encodeMaxPixelSize";
SDImageCoderOption const SDImageCoderWebImageContext = @"webImageContext";

29
SDWebImage/Core/SDImageIOAnimatedCoder.m
View File

@ -409,6 +409,11 @@ static NSString * kSDCGImageSourceRasterizationDPI = @"kCGImageSourceRasterizati
if (!image) {
return nil;
}
CGImageRef imageRef = image.CGImage;
if (!imageRef) {
// Earily return, supports CGImage only
return nil;
}
if (format != self.class.imageFormat) {
return nil;
@ -436,11 +441,33 @@ static NSString * kSDCGImageSourceRasterizationDPI = @"kCGImageSourceRasterizati
if (backgroundColor) {
properties[(__bridge NSString *)kCGImageDestinationBackgroundColor] = (__bridge id)(backgroundColor);
}
CGSize maxPixelSize = CGSizeZero;
NSValue *maxPixelSizeValue = options[SDImageCoderEncodeMaxPixelSize];
if (maxPixelSizeValue != nil) {
#if SD_MAC
maxPixelSize = maxPixelSizeValue.sizeValue;
#else
maxPixelSize = maxPixelSizeValue.CGSizeValue;
#endif
}
NSUInteger pixelWidth = CGImageGetWidth(imageRef);
NSUInteger pixelHeight = CGImageGetHeight(imageRef);
if (maxPixelSize.width > 0 && maxPixelSize.height > 0 && pixelWidth > 0 && pixelHeight > 0) {
CGFloat pixelRatio = pixelWidth / pixelHeight;
CGFloat maxPixelSizeRatio = maxPixelSize.width / maxPixelSize.height;
CGFloat finalPixelSize;
if (pixelRatio > maxPixelSizeRatio) {
finalPixelSize = maxPixelSize.width;
} else {
finalPixelSize = maxPixelSize.height;
}
properties[(__bridge NSString *)kCGImageDestinationImageMaxPixelSize] = @(finalPixelSize);
}
BOOL encodeFirstFrame = [options[SDImageCoderEncodeFirstFrameOnly] boolValue];
if (encodeFirstFrame || frames.count == 0) {
// for static single images
CGImageDestinationAddImage(imageDestination, image.CGImage, (__bridge CFDictionaryRef)properties);
CGImageDestinationAddImage(imageDestination, imageRef, (__bridge CFDictionaryRef)properties);
} else {
// for animated images
NSUInteger loopCount = image.sd_imageLoopCount;

32
SDWebImage/Core/SDImageIOCoder.m
View File

@ -221,9 +221,14 @@
if (!image) {
return nil;
}
CGImageRef imageRef = image.CGImage;
if (!imageRef) {
// Earily return, supports CGImage only
return nil;
}
if (format == SDImageFormatUndefined) {
BOOL hasAlpha = [SDImageCoderHelper CGImageContainsAlpha:image.CGImage];
BOOL hasAlpha = [SDImageCoderHelper CGImageContainsAlpha:imageRef];
if (hasAlpha) {
format = SDImageFormatPNG;
} else {
@ -258,9 +263,32 @@
if (backgroundColor) {
properties[(__bridge NSString *)kCGImageDestinationBackgroundColor] = (__bridge id)(backgroundColor);
}
CGSize maxPixelSize = CGSizeZero;
NSValue *maxPixelSizeValue = options[SDImageCoderEncodeMaxPixelSize];
if (maxPixelSizeValue != nil) {
#if SD_MAC
maxPixelSize = maxPixelSizeValue.sizeValue;
#else
maxPixelSize = maxPixelSizeValue.CGSizeValue;
#endif
}
NSUInteger pixelWidth = CGImageGetWidth(imageRef);
NSUInteger pixelHeight = CGImageGetHeight(imageRef);
if (maxPixelSize.width > 0 && maxPixelSize.height > 0 && pixelWidth > 0 && pixelHeight > 0) {
CGFloat pixelRatio = pixelWidth / pixelHeight;
CGFloat maxPixelSizeRatio = maxPixelSize.width / maxPixelSize.height;
CGFloat finalPixelSize;
if (pixelRatio > maxPixelSizeRatio) {
finalPixelSize = maxPixelSize.width;
} else {
finalPixelSize = maxPixelSize.height;
}
properties[(__bridge NSString *)kCGImageDestinationImageMaxPixelSize] = @(finalPixelSize);
}
// Add your image to the destination.
CGImageDestinationAddImage(imageDestination, image.CGImage, (__bridge CFDictionaryRef)properties);
CGImageDestinationAddImage(imageDestination, imageRef, (__bridge CFDictionaryRef)properties);
// Finalize the destination.
if (CGImageDestinationFinalize(imageDestination) == NO) {