iOSフィルタのCIBlendWithAlphaMaskの特殊なシステムでのレンダリングに失敗した解決策
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一例として、iOS 10.1.1が
既知の問題機種:
元の実装:
修正後のインプリメンテーション:
画像部分のモザイクのソースコードを添付します.
コードの説明:原図をモザイク化し、モザイク後の画像ciOutputImagePixellate を得る原図の顔認識を行い、認識後の顔領域maskImage をとる. CIBlendWithAlphaMaskフィルタを用いて合成 を行う.指定GPUレンダリング リファレンスリンク
Anonymous Faces Filter Recipe
CIBlendWithAlphaMask
レンダリングを使用してモザイク塗布効果を生成した場合、レンダリングされず、GPUペイントに変更すると、正常になります.原因は不明ですが、ソリューションをしばらく記録します.既知の問題機種:
iphone 7p iOS 10.1.1
iphone 6sp iOS 10.1.1
iphone 6 iOS 10.1.1
(iphone 5 iOS 10.1.1 )
元の実装:
CIImage *resultImage = [[CIFilter filterWithName:@"CIBlendWithAlphaMask"
keysAndValues:kCIInputImageKey, ciOutputImagePixellate,
kCIInputMaskImageKey, maskImage,
kCIInputBackgroundImageKey, ciInputImage, nil]
valueForKey:kCIOutputImageKey];
CIContext *ciContext = [CIContext contextWithOptions:nil];
CGImageRef cgImage = [ciContext createCGImage:resultImage fromRect:[resultImage extent]];
CGImageRef cgImage = [ciContext createCGImage:resultImage fromRect:[resultImage extent]];
// UIImage
UIImage *filteredImage = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
修正後のインプリメンテーション:
CIImage *resultImage = [[CIFilter filterWithName:@"CIBlendWithAlphaMask"
keysAndValues:kCIInputImageKey, ciOutputImagePixellate,
kCIInputMaskImageKey, maskImage,
kCIInputBackgroundImageKey, ciInputImage, nil]
valueForKey:kCIOutputImageKey];
EAGLContext *glContext = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
CIContext *ciContext = [CIContext contextWithEAGLContext:glContext
options:@{kCIContextWorkingColorSpace : [NSNull null]}];
CGImageRef cgImage = [ciContext createCGImage:resultImage fromRect:[resultImage extent]];
// UIImage
UIImage *filteredImage = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
画像部分のモザイクのソースコードを添付します.
- (UIImage *)demoCoreImageFilter {
UIImage *originImage = [UIImage imageNamed:@"facetest"];
// CIImage
CIImage *ciInputImage = [[CIImage alloc] initWithImage:originImage];
// CIFilter
CIFilter *filterPixellate = [CIFilter filterWithName:@"CIPixellate"];
[filterPixellate setValue:ciInputImage forKey:kCIInputImageKey];
[filterPixellate setDefaults];
[filterPixellate setValue:@32 forKey:@"inputScale"];
NSLog(@"filterPixellate : %@", filterPixellate.attributes);
// CIImage
CIImage *ciOutputImagePixellate = [filterPixellate valueForKey:kCIOutputImageKey];
//
CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeFace
context:nil
options:nil];
NSArray *faceArray = [detector featuresInImage:ciInputImage options:nil];
// Create a green circle to cover the rects that are returned.
CIImage *maskImage = nil;
for (CIFeature *f in faceArray) {
CGFloat centerX = f.bounds.origin.x + f.bounds.size.width / 2.0;
CGFloat centerY = f.bounds.origin.y + f.bounds.size.height / 2.0;
CGFloat radius = MIN(f.bounds.size.width, f.bounds.size.height) / 1.5;
CIFilter *radialGradient = [CIFilter filterWithName:@"CIRadialGradient" withInputParameters:@{
@"inputRadius0": @(radius),
@"inputRadius1": @(radius + 1.0f),
@"inputColor0": [CIColor colorWithRed:0.0 green:1.0 blue:0.0 alpha:1.0],
@"inputColor1": [CIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.0],
kCIInputCenterKey: [CIVector vectorWithX:centerX Y:centerY],
}];
CIImage *circleImage = [radialGradient valueForKey:kCIOutputImageKey];
if (nil == maskImage)
maskImage = circleImage;
else
maskImage = [[CIFilter filterWithName:@"CISourceOverCompositing" withInputParameters:@{
kCIInputImageKey: circleImage,
kCIInputBackgroundImageKey: maskImage,
}] valueForKey:kCIOutputImageKey];
}
CIImage *resultImage = [[CIFilter filterWithName:@"CIBlendWithAlphaMask"
keysAndValues:kCIInputImageKey, ciOutputImagePixellate,
kCIInputMaskImageKey, maskImage,
kCIInputBackgroundImageKey, ciInputImage, nil]
valueForKey:kCIOutputImageKey];
EAGLContext *glContext = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
CIContext *ciContext = [CIContext contextWithEAGLContext:glContext
options:@{kCIContextWorkingColorSpace : [NSNull null]}];
CGImageRef cgImage = [ciContext createCGImage:resultImage fromRect:[resultImage extent]];
// UIImage
UIImage *filteredImage = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
return filteredImage;
}
コードの説明:
Anonymous Faces Filter Recipe