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Merge pull request #2608 from zhongwuzw/fix_decompression_calculation 

Fix wrong decompression scale calculation
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DreamPiggy 2019-01-29 21:04:38 +08:00 committed by GitHub
parent 9b9b22dffb ed8c80551a
commit 7567f74e1f
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1 changed files with 4 additions and 4 deletions
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8
SDWebImage/SDWebImageImageIOCoder.m
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@ -267,14 +267,14 @@ static const CGFloat kDestSeemOverlap = 2.0f; // the numbers of pixels to over
CGSize sourceResolution = CGSizeZero; CGSize sourceResolution = CGSizeZero;
sourceResolution.width = CGImageGetWidth(sourceImageRef); sourceResolution.width = CGImageGetWidth(sourceImageRef);
sourceResolution.height = CGImageGetHeight(sourceImageRef); sourceResolution.height = CGImageGetHeight(sourceImageRef);
float sourceTotalPixels = sourceResolution.width * sourceResolution.height; CGFloat sourceTotalPixels = sourceResolution.width * sourceResolution.height;
// Determine the scale ratio to apply to the input image // Determine the scale ratio to apply to the input image
// that results in an output image of the defined size. // that results in an output image of the defined size.
// see kDestImageSizeMB, and how it relates to destTotalPixels. // see kDestImageSizeMB, and how it relates to destTotalPixels.
float imageScale = kDestTotalPixels / sourceTotalPixels; CGFloat imageScale = sqrt(kDestTotalPixels / sourceTotalPixels);
CGSize destResolution = CGSizeZero; CGSize destResolution = CGSizeZero;
destResolution.width = (int)(sourceResolution.width*imageScale); destResolution.width = (int)(sourceResolution.width * imageScale);
destResolution.height = (int)(sourceResolution.height*imageScale); destResolution.height = (int)(sourceResolution.height * imageScale);
// device color space // device color space
CGColorSpaceRef colorspaceRef = SDCGColorSpaceGetDeviceRGB(); CGColorSpaceRef colorspaceRef = SDCGColorSpaceGetDeviceRGB();