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handle images with alpha better

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UIImages with alpha were ending up with garbage pixels in background (random memory values).  Need to initialize matrix pixels before drawing UIImage with alpha on it.

Note: didn’t fix Grayscale image with alpha stripping alpha in UIImage -> Mat conversion.
This commit is contained in:
Morrison 2016-08-16 14:59:24 -07:00
parent 45a21555c7
commit ca318e7099
1 changed files with 4 additions and 0 deletions
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4
modules/imgcodecs/src/ios_conversions.mm
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@ -106,6 +106,8 @@ void UIImageToMat(const UIImage* image,
bitmapInfo = kCGImageAlphaNone; bitmapInfo = kCGImageAlphaNone;
if (!alphaExist) if (!alphaExist)
bitmapInfo = kCGImageAlphaNone; bitmapInfo = kCGImageAlphaNone;
else
m = cv::Scalar(0);
contextRef = CGBitmapContextCreate(m.data, m.cols, m.rows, 8, contextRef = CGBitmapContextCreate(m.data, m.cols, m.rows, 8,
m.step[0], colorSpace, m.step[0], colorSpace,
bitmapInfo); bitmapInfo);
@ -116,6 +118,8 @@ void UIImageToMat(const UIImage* image,
if (!alphaExist) if (!alphaExist)
bitmapInfo = kCGImageAlphaNoneSkipLast | bitmapInfo = kCGImageAlphaNoneSkipLast |
kCGBitmapByteOrderDefault; kCGBitmapByteOrderDefault;
else
m = cv::Scalar(0);
contextRef = CGBitmapContextCreate(m.data, m.cols, m.rows, 8, contextRef = CGBitmapContextCreate(m.data, m.cols, m.rows, 8,
m.step[0], colorSpace, m.step[0], colorSpace,
bitmapInfo); bitmapInfo);