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GPUImage API文档之GPUImageFramebuffer类

GPUImageFramebuffer类用于管理帧缓冲对象，负责帧缓冲对象的创建和销毁，读取帧缓冲内容

属性

@property(readonly) CGSize size

说明：只读属性，在实现中，设置缓冲区的size

@property(readonly) GPUTextureOptions textureOptions

说明：纹理的选项

@property(readonly) GLuint texture

说明：管理纹理

@property(readonly) BOOL missingFramebuffer

说明：指示是否丢失帧缓冲对象

方法

- (id)initWithSize:(CGSize)framebufferSize

说明：创建一个size为framebufferSize大小的帧缓冲对象

参数：framebuffer的size。

返回：创建成功的帧缓冲对象。

实现

- (id)initWithSize:(CGSize)framebufferSize; {  GPUTextureOptions defaultTextureOptions;  defaultTextureOptions.minFilter = GL_LINEAR;  defaultTextureOptions.magFilter = GL_LINEAR;  defaultTextureOptions.wrapS = GL_CLAMP_TO_EDGE;  defaultTextureOptions.wrapT = GL_CLAMP_TO_EDGE;  defaultTextureOptions.internalFormat = GL_RGBA;  defaultTextureOptions.format = GL_BGRA;  defaultTextureOptions.type = GL_UNSIGNED_BYTE;  if (!(self = [self initWithSize:framebufferSize textureOptions:defaultTextureOptions onlyTexture:NO]))  {   return nil;  }  return self; }

- (id)initWithSize:(CGSize)framebufferSize textureOptions:(GPUTextureOptions)fboTextureOptions onlyTexture:(BOOL)onlyGenerateTexture

说明：创建一个size为framebufferSize大小的帧缓冲对象

参数：framebufferSize为framebuffer的size。fboTextureOptions是纹理的详细配置。onlyGenerateTexture说明是否只创建纹理而不创建陈帧缓冲对象。

返回：创建成功的帧缓冲对象。

实现

- (id)initWithSize:(CGSize)framebufferSize textureOptions:(GPUTextureOptions)fboTextureOptions onlyTexture:(BOOL)onlyGenerateTexture; {  if (!(self = [super init]))  {   return nil;  }  _textureOptions = fboTextureOptions;  _size = framebufferSize;  framebufferReferenceCount = 0;  referenceCountingDisabled = NO;  _missingFramebuffer = onlyGenerateTexture;  if (_missingFramebuffer)  {   runSynchronouslyOnVideoProcessingQueue(^{    [GPUImageContext useImageProcessingContext];    [self generateTexture];    framebuffer = 0;   });  }  else  {   [self generateFramebuffer];  }  return self; }

- (id)initWithSize:(CGSize)framebufferSize overriddenTexture:(GLuint)inputTexture

说明：创建一个size为framebufferSize大小的帧缓冲对象

参数：inputTexture为输入的纹理，用于渲染图片。

返回：创建成功的帧缓冲对象。

实现

- (id)initWithSize:(CGSize)framebufferSize overriddenTexture:(GLuint)inputTexture; {  if (!(self = [super init]))  {   return nil;  }  GPUTextureOptions defaultTextureOptions;  defaultTextureOptions.minFilter = GL_LINEAR;  defaultTextureOptions.magFilter = GL_LINEAR;  defaultTextureOptions.wrapS = GL_CLAMP_TO_EDGE;  defaultTextureOptions.wrapT = GL_CLAMP_TO_EDGE;  defaultTextureOptions.internalFormat = GL_RGBA;  defaultTextureOptions.format = GL_BGRA;  defaultTextureOptions.type = GL_UNSIGNED_BYTE;  _textureOptions = defaultTextureOptions;  _size = framebufferSize;  framebufferReferenceCount = 0;  referenceCountingDisabled = YES;  _texture = inputTexture;  return self; }

- (void)activateFramebuffer

说明：激活刚创建的framebuffer对象。只有调用它后，才会起作用。

实现

- (void)activateFramebuffer; {     glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);     glViewport(0, 0, (int)_size.width, (int)_size.height); }

- (void)lock

说明：引用计数管理 +1

实现

- (void)lock; {  if (referenceCountingDisabled)  {   return;  }  framebufferReferenceCount++; }

- (void)unlock

说明：引用计数管理 -1

实现

- (void)unlock; {  if (referenceCountingDisabled)  {   return;  }  NSAssert(framebufferReferenceCount > 0, @"Tried to overrelease a framebuffer, did you forget to call -useNextFrameForImageCapture before using -imageFromCurrentFramebuffer?");  framebufferReferenceCount--;  if (framebufferReferenceCount < 1)  {   [[GPUImageContext sharedFramebufferCache] returnFramebufferToCache:self];  } }

- (void)clearAllLocks

说明：引用计数管理 设置为0

实现

- (void)clearAllLocks; {     framebufferReferenceCount = 0; }

- (void)disableReferenceCounting

说明：引用计数管理 禁用引用计数

实现

- (void)disableReferenceCounting; {     referenceCountingDisabled = YES; }

- (void)enableReferenceCounting

说明：引用计数管理 启用引用计数

实现

- (void)enableReferenceCounting; {     referenceCountingDisabled = NO; }

- (CGImageRef)newCGImageFromFramebufferContents

说明：输出帧缓冲内容。【说明待更新......】

实现

- (CGImageRef)newCGImageFromFramebufferContents; {  // a CGImage can only be created from a 'normal' color texture  NSAssert(self.textureOptions.internalFormat == GL_RGBA, @"For conversion to a CGImage the output texture format for this filter must be GL_RGBA.");  NSAssert(self.textureOptions.type == GL_UNSIGNED_BYTE, @"For conversion to a CGImage the type of the output texture of this filter must be GL_UNSIGNED_BYTE.");  __block CGImageRef cgImageFromBytes;  runSynchronouslyOnVideoProcessingQueue(^{   [GPUImageContext useImageProcessingContext];   NSUInteger totalBytesForImage = (int)_size.width * (int)_size.height * 4;   // It appears that the width of a texture must be padded out to be a multiple of 8 (32 bytes) if reading from it using a texture cache   GLubyte *rawImagePixels;   CGDataProviderRef dataProvider = NULL;   if ([GPUImageContext supportsFastTextureUpload])   { #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE    NSUInteger paddedWidthOfImage = CVPixelBufferGetBytesPerRow(renderTarget) / 4.0;    NSUInteger paddedBytesForImage = paddedWidthOfImage * (int)_size.height * 4;    glFinish();    CFRetain(renderTarget); // I need to retain the pixel buffer here and release in the data source callback to prevent its bytes from being prematurely deallocated during a photo write operation    [self lockForReading];    rawImagePixels = (GLubyte *)CVPixelBufferGetBaseAddress(renderTarget);    dataProvider = CGDataProviderCreateWithData((__bridge_retained void*)self, rawImagePixels, paddedBytesForImage, dataProviderUnlockCallback);    [[GPUImageContext sharedFramebufferCache] addFramebufferToActiveImageCaptureList:self]; // In case the framebuffer is swapped out on the filter, need to have a strong reference to it somewhere for it to hang on while the image is in existence #else #endif   }   else   {    [self activateFramebuffer];    rawImagePixels = (GLubyte *)malloc(totalBytesForImage);    glReadPixels(0, 0, (int)_size.width, (int)_size.height, GL_RGBA, GL_UNSIGNED_BYTE, rawImagePixels);    dataProvider = CGDataProviderCreateWithData(NULL, rawImagePixels, totalBytesForImage, dataProviderReleaseCallback);    [self unlock]; // Don't need to keep this around anymore   }   CGColorSpaceRef defaultRGBColorSpace = CGColorSpaceCreateDeviceRGB();   if ([GPUImageContext supportsFastTextureUpload])   { #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE    cgImageFromBytes = CGImageCreate((int)_size.width, (int)_size.height, 8, 32, CVPixelBufferGetBytesPerRow(renderTarget), defaultRGBColorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst, dataProvider, NULL, NO, kCGRenderingIntentDefault); #else #endif   }   else   {    cgImageFromBytes = CGImageCreate((int)_size.width, (int)_size.height, 8, 32, 4 * (int)_size.width, defaultRGBColorSpace, kCGBitmapByteOrderDefault | kCGImageAlphaLast, dataProvider, NULL, NO, kCGRenderingIntentDefault);   }   // Capture image with current device orientation   CGDataProviderRelease(dataProvider);   CGColorSpaceRelease(defaultRGBColorSpace);  });  return cgImageFromBytes; }

- (void)restoreRenderTarget

说明：还原渲染目标对象

实现

- (void)restoreRenderTarget; { #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE     [self unlockAfterReading];     CFRelease(renderTarget); #else #endif }

- (void)lockForReading

说明：锁定PixelBuffer

实现：

- (void)lockForReading { #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE  if ([GPUImageContext supportsFastTextureUpload])  {   if (readLockCount == 0)   {    CVPixelBufferLockBaseAddress(renderTarget, 0);   }   readLockCount++;  } #endif }

- (void)unlockAfterReading

说明：解锁PixelBuffer

- (void)unlockAfterReading { #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE  if ([GPUImageContext supportsFastTextureUpload])  {   NSAssert(readLockCount > 0, @"Unbalanced call to -[GPUImageFramebuffer unlockAfterReading]");   readLockCount--;   if (readLockCount == 0)   {    CVPixelBufferUnlockBaseAddress(renderTarget, 0);   }  } #endif }

- (NSUInteger)bytesPerRow

说明：获取pixel buffer的行字节数

实现

- (NSUInteger)bytesPerRow; {  if ([GPUImageContext supportsFastTextureUpload])  { #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE   return CVPixelBufferGetBytesPerRow(renderTarget); #else   return _size.width * 4; // TODO: do more with this on the non-texture-cache side #endif  }  else  {   return _size.width * 4;  } }

- (GLubyte *)byteBuffer

说明：获取pixel buffer的基地址

实现

- (GLubyte *)byteBuffer; { #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE  [self lockForReading];  GLubyte * bufferBytes = CVPixelBufferGetBaseAddress(renderTarget);  [self unlockAfterReading];  return bufferBytes; #else  return NULL; // TODO: do more with this on the non-texture-cache side #endif }

完整代码

#import <Foundation/Foundation.h> #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE #import <OpenGLES/EAGL.h> #import <OpenGLES/ES2/gl.h> #import <OpenGLES/ES2/glext.h> #else #import <OpenGL/OpenGL.h> #import <OpenGL/gl.h> #endif #import <QuartzCore/QuartzCore.h> #import <CoreMedia/CoreMedia.h> typedef struct GPUTextureOptions {  GLenum minFilter;  GLenum magFilter;  GLenum wrapS;  GLenum wrapT;  GLenum internalFormat;  GLenum format;  GLenum type; } GPUTextureOptions; @interface GPUImageFramebuffer : NSObject @property(readonly) CGSize size; @property(readonly) GPUTextureOptions textureOptions; @property(readonly) GLuint texture; @property(readonly) BOOL missingFramebuffer; // Initialization and teardown - (id)initWithSize:(CGSize)framebufferSize; - (id)initWithSize:(CGSize)framebufferSize textureOptions:(GPUTextureOptions)fboTextureOptions onlyTexture:(BOOL)onlyGenerateTexture; - (id)initWithSize:(CGSize)framebufferSize overriddenTexture:(GLuint)inputTexture; // Usage - (void)activateFramebuffer; // Reference counting - (void)lock; - (void)unlock; - (void)clearAllLocks; - (void)disableReferenceCounting; - (void)enableReferenceCounting; // Image capture - (CGImageRef)newCGImageFromFramebufferContents; - (void)restoreRenderTarget; // Raw data bytes - (void)lockForReading; - (void)unlockAfterReading; - (NSUInteger)bytesPerRow; - (GLubyte *)byteBuffer; @end View Code 
#import "GPUImageFramebuffer.h" #import "GPUImageOutput.h" @interface GPUImageFramebuffer() {  GLuint framebuffer; #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE  CVPixelBufferRef renderTarget;  CVOpenGLESTextureRef renderTexture;  NSUInteger readLockCount; #else #endif  NSUInteger framebufferReferenceCount;  BOOL referenceCountingDisabled; } - (void)generateFramebuffer; - (void)generateTexture; - (void)destroyFramebuffer; @end void dataProviderReleaseCallback (void *info, const void *data, size_t size); void dataProviderUnlockCallback (void *info, const void *data, size_t size); @implementation GPUImageFramebuffer @synthesize size = _size; @synthesize textureOptions = _textureOptions; @synthesize texture = _texture; @synthesize missingFramebuffer = _missingFramebuffer; #pragma mark - #pragma mark Initialization and teardown - (id)initWithSize:(CGSize)framebufferSize textureOptions:(GPUTextureOptions)fboTextureOptions onlyTexture:(BOOL)onlyGenerateTexture; {  if (!(self = [super init]))  {   return nil;  }  _textureOptions = fboTextureOptions;  _size = framebufferSize;  framebufferReferenceCount = 0;  referenceCountingDisabled = NO;  _missingFramebuffer = onlyGenerateTexture;  if (_missingFramebuffer)  {   runSynchronouslyOnVideoProcessingQueue(^{    [GPUImageContext useImageProcessingContext];    [self generateTexture];    framebuffer = 0;   });  }  else  {   [self generateFramebuffer];  }  return self; } - (id)initWithSize:(CGSize)framebufferSize overriddenTexture:(GLuint)inputTexture; {  if (!(self = [super init]))  {   return nil;  }  GPUTextureOptions defaultTextureOptions;  defaultTextureOptions.minFilter = GL_LINEAR;  defaultTextureOptions.magFilter = GL_LINEAR;  defaultTextureOptions.wrapS = GL_CLAMP_TO_EDGE;  defaultTextureOptions.wrapT = GL_CLAMP_TO_EDGE;  defaultTextureOptions.internalFormat = GL_RGBA;  defaultTextureOptions.format = GL_BGRA;  defaultTextureOptions.type = GL_UNSIGNED_BYTE;  _textureOptions = defaultTextureOptions;  _size = framebufferSize;  framebufferReferenceCount = 0;  referenceCountingDisabled = YES;  _texture = inputTexture;  return self; } - (id)initWithSize:(CGSize)framebufferSize; {  GPUTextureOptions defaultTextureOptions;  defaultTextureOptions.minFilter = GL_LINEAR;  defaultTextureOptions.magFilter = GL_LINEAR;  defaultTextureOptions.wrapS = GL_CLAMP_TO_EDGE;  defaultTextureOptions.wrapT = GL_CLAMP_TO_EDGE;  defaultTextureOptions.internalFormat = GL_RGBA;  defaultTextureOptions.format = GL_BGRA;  defaultTextureOptions.type = GL_UNSIGNED_BYTE;  if (!(self = [self initWithSize:framebufferSize textureOptions:defaultTextureOptions onlyTexture:NO]))  {   return nil;  }  return self; } - (void)dealloc {  [self destroyFramebuffer]; } #pragma mark - #pragma mark Internal - (void)generateTexture; {  glActiveTexture(GL_TEXTURE1);  glGenTextures(1, &_texture);  glBindTexture(GL_TEXTURE_2D, _texture);  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, _textureOptions.minFilter);  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, _textureOptions.magFilter);  // This is necessary for non-power-of-two textures  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, _textureOptions.wrapS);  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, _textureOptions.wrapT);  // TODO: Handle mipmaps } - (void)generateFramebuffer; {  runSynchronouslyOnVideoProcessingQueue(^{   [GPUImageContext useImageProcessingContext];   glGenFramebuffers(1, &framebuffer);   glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);   // By default, all framebuffers on iOS 5.0+ devices are backed by texture caches, using one shared cache   if ([GPUImageContext supportsFastTextureUpload])   { #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE    CVOpenGLESTextureCacheRef coreVideoTextureCache = [[GPUImageContext sharedImageProcessingContext] coreVideoTextureCache];    // Code originally sourced from http://allmybrain.com/2011/12/08/rendering-to-a-texture-with-ios-5-texture-cache-api/    CFDictionaryRef empty; // empty value for attr value.    CFMutableDictionaryRef attrs;    empty = CFDictionaryCreate(kCFAllocatorDefault, NULL, NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks); // our empty IOSurface properties dictionary    attrs = CFDictionaryCreateMutable(kCFAllocatorDefault, 1, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);    CFDictionarySetValue(attrs, kCVPixelBufferIOSurfacePropertiesKey, empty);    CVReturn err = CVPixelBufferCreate(kCFAllocatorDefault, (int)_size.width, (int)_size.height, kCVPixelFormatType_32BGRA, attrs, &renderTarget);    if (err)    {     NSLog(@"FBO size: %f, %f", _size.width, _size.height);     NSAssert(NO, @"Error at CVPixelBufferCreate %d", err);    }    err = CVOpenGLESTextureCacheCreateTextureFromImage (kCFAllocatorDefault, coreVideoTextureCache, renderTarget,                 NULL, // texture attributes                 GL_TEXTURE_2D,                 _textureOptions.internalFormat, // opengl format                 (int)_size.width,                 (int)_size.height,                 _textureOptions.format, // native iOS format                 _textureOptions.type,                 0,                 &renderTexture);    if (err)    {     NSAssert(NO, @"Error at CVOpenGLESTextureCacheCreateTextureFromImage %d", err);    }    CFRelease(attrs);    CFRelease(empty);    glBindTexture(CVOpenGLESTextureGetTarget(renderTexture), CVOpenGLESTextureGetName(renderTexture));    _texture = CVOpenGLESTextureGetName(renderTexture);    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, _textureOptions.wrapS);    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, _textureOptions.wrapT);    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, CVOpenGLESTextureGetName(renderTexture), 0); #endif   }   else   {    [self generateTexture];    glBindTexture(GL_TEXTURE_2D, _texture);    glTexImage2D(GL_TEXTURE_2D, 0, _textureOptions.internalFormat, (int)_size.width, (int)_size.height, 0, _textureOptions.format, _textureOptions.type, 0);    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, _texture, 0);   }   #ifndef NS_BLOCK_ASSERTIONS   GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);   NSAssert(status == GL_FRAMEBUFFER_COMPLETE, @"Incomplete filter FBO: %d", status);   #endif   glBindTexture(GL_TEXTURE_2D, 0);  }); } - (void)destroyFramebuffer; {  runSynchronouslyOnVideoProcessingQueue(^{   [GPUImageContext useImageProcessingContext];   if (framebuffer)   {    glDeleteFramebuffers(1, &framebuffer);    framebuffer = 0;   }   if ([GPUImageContext supportsFastTextureUpload] && (!_missingFramebuffer))   { #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE    if (renderTarget)    {     CFRelease(renderTarget);     renderTarget = NULL;    }    if (renderTexture)    {     CFRelease(renderTexture);     renderTexture = NULL;    } #endif   }   else   {    glDeleteTextures(1, &_texture);   }  }); } #pragma mark - #pragma mark Usage - (void)activateFramebuffer; {  glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);  glViewport(0, 0, (int)_size.width, (int)_size.height); } #pragma mark - #pragma mark Reference counting - (void)lock; {  if (referenceCountingDisabled)  {   return;  }  framebufferReferenceCount++; } - (void)unlock; {  if (referenceCountingDisabled)  {   return;  }  NSAssert(framebufferReferenceCount > 0, @"Tried to overrelease a framebuffer, did you forget to call -useNextFrameForImageCapture before using -imageFromCurrentFramebuffer?");  framebufferReferenceCount--;  if (framebufferReferenceCount < 1)  {   [[GPUImageContext sharedFramebufferCache] returnFramebufferToCache:self];  } } - (void)clearAllLocks; {  framebufferReferenceCount = 0; } - (void)disableReferenceCounting; {  referenceCountingDisabled = YES; } - (void)enableReferenceCounting; {  referenceCountingDisabled = NO; } #pragma mark - #pragma mark Image capture void dataProviderReleaseCallback (void *info, const void *data, size_t size) {  free((void *)data); } void dataProviderUnlockCallback (void *info, const void *data, size_t size) {  GPUImageFramebuffer *framebuffer = (__bridge_transfer GPUImageFramebuffer*)info;  [framebuffer restoreRenderTarget];  [framebuffer unlock];  [[GPUImageContext sharedFramebufferCache] removeFramebufferFromActiveImageCaptureList:framebuffer]; } - (CGImageRef)newCGImageFromFramebufferContents; {  // a CGImage can only be created from a 'normal' color texture  NSAssert(self.textureOptions.internalFormat == GL_RGBA, @"For conversion to a CGImage the output texture format for this filter must be GL_RGBA.");  NSAssert(self.textureOptions.type == GL_UNSIGNED_BYTE, @"For conversion to a CGImage the type of the output texture of this filter must be GL_UNSIGNED_BYTE.");  __block CGImageRef cgImageFromBytes;  runSynchronouslyOnVideoProcessingQueue(^{   [GPUImageContext useImageProcessingContext];   NSUInteger totalBytesForImage = (int)_size.width * (int)_size.height * 4;   // It appears that the width of a texture must be padded out to be a multiple of 8 (32 bytes) if reading from it using a texture cache   GLubyte *rawImagePixels;   CGDataProviderRef dataProvider = NULL;   if ([GPUImageContext supportsFastTextureUpload])   { #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE    NSUInteger paddedWidthOfImage = CVPixelBufferGetBytesPerRow(renderTarget) / 4.0;    NSUInteger paddedBytesForImage = paddedWidthOfImage * (int)_size.height * 4;    glFinish();    CFRetain(renderTarget); // I need to retain the pixel buffer here and release in the data source callback to prevent its bytes from being prematurely deallocated during a photo write operation    [self lockForReading];    rawImagePixels = (GLubyte *)CVPixelBufferGetBaseAddress(renderTarget);    dataProvider = CGDataProviderCreateWithData((__bridge_retained void*)self, rawImagePixels, paddedBytesForImage, dataProviderUnlockCallback);    [[GPUImageContext sharedFramebufferCache] addFramebufferToActiveImageCaptureList:self]; // In case the framebuffer is swapped out on the filter, need to have a strong reference to it somewhere for it to hang on while the image is in existence #else #endif   }   else   {    [self activateFramebuffer];    rawImagePixels = (GLubyte *)malloc(totalBytesForImage);    glReadPixels(0, 0, (int)_size.width, (int)_size.height, GL_RGBA, GL_UNSIGNED_BYTE, rawImagePixels);    dataProvider = CGDataProviderCreateWithData(NULL, rawImagePixels, totalBytesForImage, dataProviderReleaseCallback);    [self unlock]; // Don't need to keep this around anymore   }   CGColorSpaceRef defaultRGBColorSpace = CGColorSpaceCreateDeviceRGB();   if ([GPUImageContext supportsFastTextureUpload])   { #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE    cgImageFromBytes = CGImageCreate((int)_size.width, (int)_size.height, 8, 32, CVPixelBufferGetBytesPerRow(renderTarget), defaultRGBColorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst, dataProvider, NULL, NO, kCGRenderingIntentDefault); #else #endif   }   else   {    cgImageFromBytes = CGImageCreate((int)_size.width, (int)_size.height, 8, 32, 4 * (int)_size.width, defaultRGBColorSpace, kCGBitmapByteOrderDefault | kCGImageAlphaLast, dataProvider, NULL, NO, kCGRenderingIntentDefault);   }   // Capture image with current device orientation   CGDataProviderRelease(dataProvider);   CGColorSpaceRelease(defaultRGBColorSpace);  });  return cgImageFromBytes; } - (void)restoreRenderTarget; { #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE  [self unlockAfterReading];  CFRelease(renderTarget); #else #endif } #pragma mark - #pragma mark Raw data bytes - (void)lockForReading { #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE  if ([GPUImageContext supportsFastTextureUpload])  {   if (readLockCount == 0)   {    CVPixelBufferLockBaseAddress(renderTarget, 0);   }   readLockCount++;  } #endif } - (void)unlockAfterReading { #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE  if ([GPUImageContext supportsFastTextureUpload])  {   NSAssert(readLockCount > 0, @"Unbalanced call to -[GPUImageFramebuffer unlockAfterReading]");   readLockCount--;   if (readLockCount == 0)   {    CVPixelBufferUnlockBaseAddress(renderTarget, 0);   }  } #endif } - (NSUInteger)bytesPerRow; {  if ([GPUImageContext supportsFastTextureUpload])  { #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE   return CVPixelBufferGetBytesPerRow(renderTarget); #else   return _size.width * 4; // TODO: do more with this on the non-texture-cache side #endif  }  else  {   return _size.width * 4;  } } - (GLubyte *)byteBuffer; { #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE  [self lockForReading];  GLubyte * bufferBytes = CVPixelBufferGetBaseAddress(renderTarget);  [self unlockAfterReading];  return bufferBytes; #else  return NULL; // TODO: do more with this on the non-texture-cache side #endif } - (GLuint)texture; { // NSLog(@"Accessing texture: %d from FB: %@", _texture, self);  return _texture; } @end View Code
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