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]))
{returnnil;
}returnself;
}
- (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]))
{returnnil;
}
_textureOptions=fboTextureOptions;
_size=framebufferSize;
framebufferReferenceCount=0;
referenceCountingDisabled=NO;
_missingFramebuffer=onlyGenerateTexture;if(_missingFramebuffer)
{
runSynchronouslyOnVideoProcessingQueue(^{
[GPUImageContext useImageProcessingContext];
[self generateTexture];
framebuffer=0;
});
}else{
[self generateFramebuffer];
}returnself;
}
- (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]))
{returnnil;
}
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;returnself;
}
- (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 textureNSAssert(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 cacheGLubyte*rawImagePixels;
CGDataProviderRef dataProvider=NULL;if([GPUImageContext supportsFastTextureUpload])
{#ifTARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONENSUInteger 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 writeOperation[self lockForReading];
rawImagePixels= (GLubyte *)CVPixelBufferGetBaseAddress(renderTarget);
dataProvider= CGDataProviderCreateWithData((__bridge_retainedvoid*)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])
{#ifTARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONEcgImageFromBytes= 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 orientationCGDataProviderRelease(dataProvider);
CGColorSpaceRelease(defaultRGBColorSpace);
});returncgImageFromBytes;
}
- (void)restoreRenderTarget
说明：还原渲染目标对象
实现
- (void)restoreRenderTarget;
{#ifTARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE[self unlockAfterReading];
CFRelease(renderTarget);#else#endif}
- (void)lockForReading
说明：锁定PixelBuffer
实现：
- (void)lockForReading
{#ifTARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONEif([GPUImageContext supportsFastTextureUpload])
{if(readLockCount ==0)
{
CVPixelBufferLockBaseAddress(renderTarget,0);
}
readLockCount++;
}#endif}
- (void)unlockAfterReading
说明：解锁PixelBuffer
- (void)unlockAfterReading
{#ifTARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONEif([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])
{#ifTARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONEreturnCVPixelBufferGetBytesPerRow(renderTarget);#elsereturn_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;
{#ifTARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE[self lockForReading];
GLubyte* bufferBytes =CVPixelBufferGetBaseAddress(renderTarget);
[self unlockAfterReading];returnbufferBytes;#elsereturnNULL;//TODO: do more with this on the non-texture-cache side#endif}
完整代码
#import <Foundation/Foundation.h>#ifTARGET_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>typedefstructGPUTextureOptions {
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;#ifTARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONECVPixelBufferRef renderTarget;
CVOpenGLESTextureRef renderTexture;
NSUInteger readLockCount;#else#endifNSUInteger framebufferReferenceCount;
BOOL referenceCountingDisabled;
}- (void)generateFramebuffer;- (void)generateTexture;- (void)destroyFramebuffer;
@endvoiddataProviderReleaseCallback (void*info,constvoid*data, size_t size);voiddataProviderUnlockCallback (void*info,constvoid*data, size_t size);
@implementation GPUImageFramebuffer
@synthesize size=_size;
@synthesize textureOptions=_textureOptions;
@synthesize texture=_texture;
@synthesize missingFramebuffer=_missingFramebuffer;#pragmamark -#pragmamark Initialization and teardown
-(id)initWithSize:(CGSize)framebufferSize textureOptions:(GPUTextureOptions)fboTextureOptions onlyTexture:(BOOL)onlyGenerateTexture;
{if(!(self =[super init]))
{returnnil;
}
_textureOptions=fboTextureOptions;
_size=framebufferSize;
framebufferReferenceCount=0;
referenceCountingDisabled=NO;
_missingFramebuffer=onlyGenerateTexture;if(_missingFramebuffer)
{
runSynchronouslyOnVideoProcessingQueue(^{
[GPUImageContext useImageProcessingContext];
[self generateTexture];
framebuffer=0;
});
}else{
[self generateFramebuffer];
}returnself;
}-(id)initWithSize:(CGSize)framebufferSize overriddenTexture:(GLuint)inputTexture;
{if(!(self =[super init]))
{returnnil;
}
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;returnself;
}-(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]))
{returnnil;
}returnself;
}- (void)dealloc
{
[self destroyFramebuffer];
}#pragmamark -#pragmamark 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 texturesglTexParameteri(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 cacheif([GPUImageContext supportsFastTextureUpload])
{#ifTARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONECVOpenGLESTextureCacheRef coreVideoTextureCache=[[GPUImageContext sharedImageProcessingContext] coreVideoTextureCache];//Code originally sourced fromhttp://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 dictionaryattrs = 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 attributesGL_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);#endifglBindTexture(GL_TEXTURE_2D,0);
});
}- (void)destroyFramebuffer;
{
runSynchronouslyOnVideoProcessingQueue(^{
[GPUImageContext useImageProcessingContext];if(framebuffer)
{
glDeleteFramebuffers(1, &framebuffer);
framebuffer=0;
}if([GPUImageContext supportsFastTextureUpload] && (!_missingFramebuffer))
{#ifTARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONEif(renderTarget)
{
CFRelease(renderTarget);
renderTarget=NULL;
}if(renderTexture)
{
CFRelease(renderTexture);
renderTexture=NULL;
}#endif}else{
glDeleteTextures(1, &_texture);
}
});
}#pragmamark -#pragmamark Usage
- (void)activateFramebuffer;
{
glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
glViewport(0,0, (int)_size.width, (int)_size.height);
}#pragmamark -#pragmamark 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;
}#pragmamark -#pragmamark Image capturevoiddataProviderReleaseCallback (void*info,constvoid*data, size_t size)
{free((void*)data);
}voiddataProviderUnlockCallback (void*info,constvoid*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 textureNSAssert(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 cacheGLubyte*rawImagePixels;
CGDataProviderRef dataProvider=NULL;if([GPUImageContext supportsFastTextureUpload])
{#ifTARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONENSUInteger 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_retainedvoid*)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])
{#ifTARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONEcgImageFromBytes= 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 orientationCGDataProviderRelease(dataProvider);
CGColorSpaceRelease(defaultRGBColorSpace);
});returncgImageFromBytes;
}- (void)restoreRenderTarget;
{#ifTARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE[self unlockAfterReading];
CFRelease(renderTarget);#else#endif}#pragmamark -#pragmamark Raw data bytes
- (void)lockForReading
{#ifTARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONEif([GPUImageContext supportsFastTextureUpload])
{if(readLockCount ==0)
{
CVPixelBufferLockBaseAddress(renderTarget,0);
}
readLockCount++;
}#endif}- (void)unlockAfterReading
{#ifTARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONEif([GPUImageContext supportsFastTextureUpload])
{
NSAssert(readLockCount>0,@"Unbalanced call to -[GPUImageFramebuffer unlockAfterReading]");
readLockCount--;if(readLockCount ==0)
{
CVPixelBufferUnlockBaseAddress(renderTarget,0);
}
}#endif}-(NSUInteger)bytesPerRow;
{if([GPUImageContext supportsFastTextureUpload])
{#ifTARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONEreturnCVPixelBufferGetBytesPerRow(renderTarget);#elsereturn_size.width *4;//TODO: do more with this on the non-texture-cache side#endif}else{return_size.width *4;
}
}- (GLubyte *)byteBuffer;
{#ifTARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE[self lockForReading];
GLubyte* bufferBytes =CVPixelBufferGetBaseAddress(renderTarget);
[self unlockAfterReading];returnbufferBytes;#elsereturnNULL;//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