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Fix wrong decompression scale calculation

This commit is contained in:
zhongwuzw 2019-01-29 18:17:49 +08:00
parent 0e8dc82891
commit 5dab8f0973
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;
sourceResolution.width = CGImageGetWidth(sourceImageRef);
sourceResolution.height = CGImageGetHeight(sourceImageRef);
float sourceTotalPixels = sourceResolution.width * sourceResolution.height;
CGFloat sourceTotalPixels = sourceResolution.width * sourceResolution.height * image.scale * image.scale;
// Determine the scale ratio to apply to the input image
// that results in an output image of the defined size.
// see kDestImageSizeMB, and how it relates to destTotalPixels.
float imageScale = kDestTotalPixels / sourceTotalPixels;
CGFloat imageScale = sqrt(kDestTotalPixels / sourceTotalPixels);
CGSize destResolution = CGSizeZero;
destResolution.width = (int)(sourceResolution.width*imageScale);
destResolution.height = (int)(sourceResolution.height*imageScale);
destResolution.width = (int)(sourceResolution.width * imageScale);
destResolution.height = (int)(sourceResolution.height * imageScale);
// device color space
CGColorSpaceRef colorspaceRef = SDCGColorSpaceGetDeviceRGB();