我正在使用 Brad Larson 的 GPUImage 并基于 GoBackSpaces 的 DLCImagePickerController 为 iPhone 构建一个照片应用程序（到目前为止它帮助我学习了很多东西），但我坚持使用我希望应用程序具有的功能之一. 我有两组案例：
案例A：一组代表“胶卷”的盒子（Filter Cases） 案例B：一组代表“相机镜头”的盒子（Len Cases）
在每种情况下，我都有 GPUImageFilterGroups。我希望用户能够从案例 A 中选择一个过滤器，然后能够在同一个静态图片上应用案例 B 中的另一个过滤器。所以，简而言之，在用户从案例 A 中选择一个过滤器后，静态图片会根据选择的过滤器发生变化，然后我想在修改后的静态图片上应用案例 B 中的另一个过滤器。我尝试了几种不同的方法，但我没有运气。从案例 B 中选择过滤器后，StaticPicture 消失。我需要保留一些东西吗？任何帮助将不胜感激。这是我的代码：
filter = [[GPUImageRGBFilter alloc] init];
lens = [[GPUImageRGBFilter alloc] init];
-(void) filterClicked:(UIButton *) sender {
for(UIView *view in self.filterScrollView.subviews){
if([view isKindOfClass:[UIButton class]]){
[(UIButton *)view setSelected:NO];
}
}
[sender setSelected:YES];
[self removeAllTargets];
selectedFilter = sender.tag;
[self setFilter:sender.tag];
[self prepareFilter];
}
-(void) lensClicked:(UIButton *) sender {
for(UIView *view in self.lensScrollView.subviews){
if([view isKindOfClass:[UIButton class]]){
[(UIButton *)view setSelected:NO];
}
}
[sender setSelected:YES];
selectedLens = sender.tag;
[self setLens:sender.tag];
[self prepareLens];
}
-(void) setFilter:(int) index {
switch (index) {
case 1:{
filter = [[GPUImageFilterGroup alloc] init];
UIImage *inputImage23 = [UIImage imageNamed:@"vignette.png"];
sourcePicture5 = [[GPUImagePicture alloc] initWithImage:inputImage23 smoothlyScaleOutput:YES];
GPUImageOverlayBlendFilter * overlay23 = [[GPUImageOverlayBlendFilter alloc] init];
[(GPUImageFilterGroup *)filter addFilter:overlay23];
[sourcePicture5 addTarget:overlay23 atTextureLocation:1];
[sourcePicture5 processImage];
UIImage *inputImage21 = [UIImage imageNamed:@"frame.png"];
sourcePicture6 = [[GPUImagePicture alloc] initWithImage:inputImage21 smoothlyScaleOutput:YES];
GPUImageNormalBlendFilter * overlay21 = [[GPUImageNormalBlendFilter alloc] init];
[(GPUImageFilterGroup *)filter addFilter:overlay21];
[sourcePicture6 addTarget:overlay21 atTextureLocation:1];
[sourcePicture6 processImage];
GPUilforddelta100 *ilford = [[GPUilforddelta100 alloc] init];
[(GPUImageFilterGroup *)filter addFilter:ilford];
[overlay23 addTarget:overlay21];
[overlay21 addTarget:ilford];
[(GPUImageFilterGroup *)filter setInitialFilters:[NSArray arrayWithObject:overlay23]];
[(GPUImageFilterGroup *)filter setTerminalFilter:ilford];
} break;
case 2: {
filter = [[GPUImageFilterGroup alloc] init];
UIImage *inputImage1 = [UIImage imageNamed:@"trixgrain.png"];
sourcePicture = [[GPUImagePicture alloc] initWithImage:inputImage1 smoothlyScaleOutput:YES];
GPUImageMultiplyBlendFilter * overlay1 = [[GPUImageMultiplyBlendFilter alloc] init];
[(GPUImageFilterGroup *)filter addFilter:overlay1];
[sourcePicture addTarget:overlay1 atTextureLocation:1];
[sourcePicture processImage];
UIImage *inputImage2 = [UIImage imageNamed:@"trixfeel.png"];
sourcePicture3 = [[GPUImagePicture alloc] initWithImage:inputImage2 smoothlyScaleOutput:YES];
GPUImageOverlayBlendFilter * overlay2 = [[GPUImageOverlayBlendFilter alloc] init];
[(GPUImageFilterGroup *)filter addFilter:overlay2];
[sourcePicture3 addTarget:overlay2 atTextureLocation:1];
[sourcePicture3 processImage];
UIImage *inputImage18 = [UIImage imageNamed:@"frame.png"];
sourcePicture2 = [[GPUImagePicture alloc] initWithImage:inputImage18 smoothlyScaleOutput:YES];
GPUImageNormalBlendFilter * overlay18 = [[GPUImageNormalBlendFilter alloc] init];
[(GPUImageFilterGroup *)filter addFilter:overlay18];
[sourcePicture2 addTarget:overlay18 atTextureLocation:1];
[sourcePicture2 processImage];
GPUTrix400 *trix400 = [[GPUTrix400 alloc] init];
[(GPUImageFilterGroup *)filter addFilter:trix400];
[overlay2 addTarget:overlay1];
[overlay1 addTarget:overlay18];
[overlay18 addTarget:trix400];
[(GPUImageFilterGroup *)filter setInitialFilters:[NSArray arrayWithObject:overlay2]];
[(GPUImageFilterGroup *)filter setTerminalFilter:trix400];
} break;
default:
filter = [[GPUImageRGBFilter alloc] init];
break;
}
}
-(void) setLens:(int) index {
switch (index) {
case 1:{
lens = [[GPUImageFilterGroup alloc] init];
UIImage *inputImage1 = [UIImage imageNamed:@"lightleak.png"];
sourcePicture = [[GPUImagePicture alloc] initWithImage:inputImage1 smoothlyScaleOutput:YES];
GPUImageOverlayBlendFilter * overlay1 = [[GPUImageOverlayBlendFilter alloc] init];
[(GPUImageFilterGroup *)lens addFilter:overlay1];
[sourcePicture addTarget:overlay1 atTextureLocation:1];
[sourcePicture processImage];
UIImage *inputImage18 = [UIImage imageNamed:@"holgaframe.png"];
sourcePicture2 = [[GPUImagePicture alloc] initWithImage:inputImage18 smoothlyScaleOutput:YES];
GPUImageNormalBlendFilter * overlay18 = [[GPUImageNormalBlendFilter alloc] init];
[(GPUImageFilterGroup *)lens addFilter:overlay18];
[sourcePicture2 addTarget:overlay18 atTextureLocation:1];
[sourcePicture2 processImage];
GPUholgaroid *holgaroid = [[GPUholgaroid alloc] init];
[(GPUImageFilterGroup *)lens addFilter:holgaroid];
[holgaroid addTarget:overlay1];
[overlay1 addTarget:overlay18];
[(GPUImageFilterGroup *)lens setInitialFilters:[NSArray arrayWithObject:holgaroid]];
[(GPUImageFilterGroup *)lens setTerminalFilter:overlay18];
} break;
case 2:{
lens = [[GPUImageFilterGroup alloc] init];
UIImage *inputImage1 = [UIImage imageNamed:@"dianafeel.png"];
sourcePicture = [[GPUImagePicture alloc] initWithImage:inputImage1 smoothlyScaleOutput:YES];
GPUImageOverlayBlendFilter * overlay1 = [[GPUImageOverlayBlendFilter alloc] init];
[(GPUImageFilterGroup *)lens addFilter:overlay1];
[sourcePicture addTarget:overlay1 atTextureLocation:1];
[sourcePicture processImage];
UIImage *inputImage18 = [UIImage imageNamed:@"dianaframe.png"];
sourcePicture2 = [[GPUImagePicture alloc] initWithImage:inputImage18 smoothlyScaleOutput:YES];
GPUImageNormalBlendFilter * overlay18 = [[GPUImageNormalBlendFilter alloc] init];
[(GPUImageFilterGroup *)lens addFilter:overlay18];
[sourcePicture2 addTarget:overlay18 atTextureLocation:1];
[sourcePicture2 processImage];
GPUdianaf *dianaf = [[GPUdianaf alloc] init];
[(GPUImageFilterGroup *)lens addFilter:dianaf];
[dianaf addTarget:overlay1];
[overlay1 addTarget:overlay18];
[(GPUImageFilterGroup *)lens setInitialFilters:[NSArray arrayWithObject:dianaf]];
[(GPUImageFilterGroup *)lens setTerminalFilter:overlay18];
} break;
default:
lens = [[GPUImageRGBFilter alloc] init];
break;
}
}
-(void) prepareFilter {
if (![UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera]) {
isStatic = YES;
}
if (!isStatic) {
[self prepareLiveFilter];
} else {
[self prepareStaticFilter];
}
}
-(void) prepareLiveFilter {
[filter removeAllTargets];
[cropFilter removeAllTargets];
[blurFilter removeAllTargets];
[stillCamera addTarget:cropFilter];
[cropFilter addTarget:filter];
if (hasBlur) {
[filter addTarget:blurFilter];
[blurFilter addTarget:self.imageView];
} else {
[filter addTarget:self.imageView];
}
//GPUImage issue with new code, do not use until further improvement
//[filter prepareForImageCapture];
}
-(void) prepareStaticFilter {
if (!staticPicture) {
[self performSelector:@selector(switchToLibrary:) withObject:nil afterDelay:3.5];
}
[stillCamera removeAllTargets];
[staticPicture removeAllTargets];
[staticPicture addTarget:filter];
if (hasBlur) {
[filter addTarget:blurFilter];
[blurFilter addTarget:self.imageView];
} else {
[filter addTarget:self.imageView];
}
GPUImageRotationMode imageViewRotationMode = kGPUImageNoRotation;
switch (staticPictureOriginalOrientation) {
case UIImageOrientationLeft:
imageViewRotationMode = kGPUImageRotateLeft;
break;
case UIImageOrientationRight:
imageViewRotationMode = kGPUImageRotateRight;
break;
case UIImageOrientationDown:
imageViewRotationMode = kGPUImageRotate180;
break;
default:
imageViewRotationMode = kGPUImageNoRotation;
break;
}
[self.imageView setInputRotation:imageViewRotationMode atIndex:0];
[staticPicture processImage];
}
-(void) prepareLens {
if (![UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera]) {
isStatic = YES;
}
if (!isStatic) {
[self prepareLiveLens];
} else {
[self prepareStaticLens];
}
}
-(void) prepareLiveLens {
[stillCamera addTarget:lens];
[lens addTarget:self.imageView];
//GPUImage issue with new code, do not use until further improvement
//[lens prepareForImageCapture];
}
-(void) prepareStaticLens {
if (!staticPicture) {
[self performSelector:@selector(switchToLibrary:) withObject:nil afterDelay:3.5];
}
[staticPicture addTarget:lens];
[lens addTarget:self.imageView];
GPUImageRotationMode imageViewRotationMode = kGPUImageNoRotation;
switch (staticPictureOriginalOrientation) {
case UIImageOrientationLeft:
imageViewRotationMode = kGPUImageRotateLeft;
break;
case UIImageOrientationRight:
imageViewRotationMode = kGPUImageRotateRight;
break;
case UIImageOrientationDown:
imageViewRotationMode = kGPUImageRotate180;
break;
default:
imageViewRotationMode = kGPUImageNoRotation;
break;
}
[self.imageView setInputRotation:imageViewRotationMode atIndex:0];
[staticPicture processImage];
}
-(void) removeAllTargets {
[filter removeAllTargets];
[lens removeAllTargets];
[sourcePicture removeAllTargets];
[sourcePicture2 removeAllTargets];
[sourcePicture3 removeAllTargets];
[stillCamera removeAllTargets];
[staticPicture removeAllTargets];
[cropFilter removeAllTargets];
[blurFilter removeAllTargets];
}
-(void) prepareForCapture {
[stillCamera.inputCamera lockForConfiguration:nil];
if(self.flashToggleButton.selected &&
[stillCamera.inputCamera hasTorch]){
[stillCamera.inputCamera setTorchMode:AVCaptureTorchModeOn];
[self performSelector:@selector(captureImage)
withObject:nil
afterDelay:0.50];
}else{
[self captureImage];
}
}
-(void)captureImage {
[lens forceProcessingAtSize:CGSizeMake (1936, 1936)];
[staticPicture addTarget:lens];
[stillCamera capturePhotoAsImageProcessedUpToFilter:lens
withCompletionHandler:^(UIImage *processed, NSError *error) {
isStatic = YES;
runOnMainQueueWithoutDeadlocking(^{
@autoreleasepool {
[stillCamera.inputCamera unlockForConfiguration];
[stillCamera stopCameraCapture];
[self removeAllTargets];
staticPicture = [[GPUImagePicture alloc] initWithImage:processed smoothlyScaleOutput:NO];
staticPictureOriginalOrientation = processed.imageOrientation;
[self prepareFilter];
[self.retakeButton setHidden:NO];
[self.photoCaptureButton setTitle:@"Done" forState:UIControlStateNormal];
[self.photoCaptureButton setImage:nil forState:UIControlStateNormal];
[self.photoCaptureButton setEnabled:YES];
if(![self.filtersToggleButton isSelected]){
[self showFilters];
}
}
});
}];
}
-(IBAction) takePhoto:(id)sender{
[self.photoCaptureButton setEnabled:NO];
if (!isStatic) {
isStatic = YES;
[self.libraryToggleButton setHidden:YES];
[self.cameraToggleButton setEnabled:NO];
[self.flashToggleButton setEnabled:NO];
[self prepareForCapture];
} else {
GPUImageOutput<GPUImageInput> *processUpTo;
if (hasBlur) {
processUpTo = blurFilter;
} else {
processUpTo = lens;
}
[staticPicture processImage];
UIImage *currentFilteredVideoFrame = [processUpTo imageFromCurrentlyProcessedOutputWithOrientation:staticPictureOriginalOrientation];
NSDictionary *info = [[NSDictionary alloc] initWithObjectsAndKeys:
UIImageJPEGRepresentation(currentFilteredVideoFrame, self.outputJPEGQuality), @"data", nil];
[self.delegate imagePickerController:self didFinishPickingMediaWithInfo:info];
}
}
-(void) dealloc {
[self removeAllTargets];
stillCamera = nil;
cropFilter = nil;
filter = nil;
blurFilter = nil;
sourcePicture = nil;
sourcePicture2 = nil;
sourcePicture3 = nil;
staticPicture = nil;
self.blurOverlayView = nil;
self.focusView = nil;
}
提前感谢菜鸟对这个问题的任何解释或帮助。