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 = ;
referenceCountingDisabled = NO;
_missingFramebuffer = onlyGenerateTexture; if (_missingFramebuffer)
{
runSynchronouslyOnVideoProcessingQueue(^{
[GPUImageContext useImageProcessingContext];
[self generateTexture];
framebuffer = ;
});
}
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 = ;
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(, , (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 > , @"Tried to overrelease a framebuffer, did you forget to call -useNextFrameForImageCapture before using -imageFromCurrentFramebuffer?");
framebufferReferenceCount--;
if (framebufferReferenceCount < )
{
[[GPUImageContext sharedFramebufferCache] returnFramebufferToCache:self];
}
}
- (void)clearAllLocks
说明：引用计数管理 设置为0
实现
- (void)clearAllLocks;
{
framebufferReferenceCount = ;
}
- (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 * ;
// 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 * ; 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(, , (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, , , CVPixelBufferGetBytesPerRow(renderTarget), defaultRGBColorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst, dataProvider, NULL, NO, kCGRenderingIntentDefault);
#else
#endif
}
else
{
cgImageFromBytes = CGImageCreate((int)_size.width, (int)_size.height, , , * (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 == )
{
CVPixelBufferLockBaseAddress(renderTarget, );
}
readLockCount++;
}
#endif
}
- (void)unlockAfterReading
说明：解锁PixelBuffer
- (void)unlockAfterReading
{
#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
if ([GPUImageContext supportsFastTextureUpload])
{
NSAssert(readLockCount > , @"Unbalanced call to -[GPUImageFramebuffer unlockAfterReading]");
readLockCount--;
if (readLockCount == )
{
CVPixelBufferUnlockBaseAddress(renderTarget, );
}
}
#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 * ; // TODO: do more with this on the non-texture-cache side
#endif
}
else
{
return _size.width * ;
}
}
- (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
#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 = ;
referenceCountingDisabled = NO;
_missingFramebuffer = onlyGenerateTexture; if (_missingFramebuffer)
{
runSynchronouslyOnVideoProcessingQueue(^{
[GPUImageContext useImageProcessingContext];
[self generateTexture];
framebuffer = ;
});
}
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 = ;
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(, &_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(, &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, , &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks); // our empty IOSurface properties dictionary
attrs = CFDictionaryCreateMutable(kCFAllocatorDefault, , &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,
,
&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), );
#endif
}
else
{
[self generateTexture]; glBindTexture(GL_TEXTURE_2D, _texture); glTexImage2D(GL_TEXTURE_2D, , _textureOptions.internalFormat, (int)_size.width, (int)_size.height, , _textureOptions.format, _textureOptions.type, );
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, _texture, );
} #ifndef NS_BLOCK_ASSERTIONS
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
NSAssert(status == GL_FRAMEBUFFER_COMPLETE, @"Incomplete filter FBO: %d", status);
#endif glBindTexture(GL_TEXTURE_2D, );
});
} - (void)destroyFramebuffer;
{
runSynchronouslyOnVideoProcessingQueue(^{
[GPUImageContext useImageProcessingContext]; if (framebuffer)
{
glDeleteFramebuffers(, &framebuffer);
framebuffer = ;
} 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(, &_texture);
} });
} #pragma mark -
#pragma mark Usage - (void)activateFramebuffer;
{
glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
glViewport(, , (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 > , @"Tried to overrelease a framebuffer, did you forget to call -useNextFrameForImageCapture before using -imageFromCurrentFramebuffer?");
framebufferReferenceCount--;
if (framebufferReferenceCount < )
{
[[GPUImageContext sharedFramebufferCache] returnFramebufferToCache:self];
}
} - (void)clearAllLocks;
{
framebufferReferenceCount = ;
} - (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 * ;
// 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 * ; 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(, , (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, , , CVPixelBufferGetBytesPerRow(renderTarget), defaultRGBColorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst, dataProvider, NULL, NO, kCGRenderingIntentDefault);
#else
#endif
}
else
{
cgImageFromBytes = CGImageCreate((int)_size.width, (int)_size.height, , , * (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 == )
{
CVPixelBufferLockBaseAddress(renderTarget, );
}
readLockCount++;
}
#endif
} - (void)unlockAfterReading
{
#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
if ([GPUImageContext supportsFastTextureUpload])
{
NSAssert(readLockCount > , @"Unbalanced call to -[GPUImageFramebuffer unlockAfterReading]");
readLockCount--;
if (readLockCount == )
{
CVPixelBufferUnlockBaseAddress(renderTarget, );
}
}
#endif
} - (NSUInteger)bytesPerRow;
{
if ([GPUImageContext supportsFastTextureUpload])
{
#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
return CVPixelBufferGetBytesPerRow(renderTarget);
#else
return _size.width * ; // TODO: do more with this on the non-texture-cache side
#endif
}
else
{
return _size.width * ;
}
} - (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
GPUImage API文档之GPUImageFramebuffer类的更多相关文章
- GPUImage API 文档之GPUImageFilter类
GPUImageFilter类 方法 - (id)initWithVertexShaderFromString:(NSString *)vertexShaderString fragmentShade ...
- GPUImage API 文档之GPUImageOutput类
GPUImageOutput类将静态图像纹理上传到OpenGL ES中,然后使用这些纹理去处理进程链中的下一个对象.它的子类可以获得滤镜处理后的图片功能.［本文讲的很少,由于有许多地方不清楚,以后会更 ...
- GPUImage API文档之GPUImageContext类
GPUImageContext类,提供OpenGL ES基本环境,我们一般不会用到,所以讲的很简单. 属性 @property(readonly, nonatomic) dispatch_queue_ ...
- GPUImage API文档之GPUImageFramebufferCache类
GPUImageFramebufferCache类负责管理GPUImageFramebuffer对象,是一个GPUImageFramebuffer对象的缓存. 方法 - (GPUImageFrameb ...
- GPUImage API 文档之GPUImagePicture类
GPUImagePicture类静态图像处理操作,它可以是需要处理的静态图像,也可以是一张作为纹理使用的图片,调用向它发送processImage消息,进行图像滤镜处理. 方法 - (id)initW ...
- GPUImage API文档之GLProgram类
GLProgram是GPUImage中代表openGL ES 中的program,具有glprogram功能. 属性 @property(readwrite, nonatomic) BOOL init ...
- GPUImage API文档之GPUImageInput协议
GPUImageInput协议主要包含一些输入需要渲染目标的操作. - (void)newFrameReadyAtTime:(CMTime)frameTime atIndex:(NSInteger)t ...
- 通过API文档查询Math类的方法，打印出近似圆，只要给定不同半径，圆的大小就会随之发生改变
package question; import java.util.Scanner; import java.lang.Math; public class MathTest { /** * 未搞懂 ...
- Java，面试题，简历，Linux，大数据，常用开发工具类，API文档，电子书，各种思维导图资源，百度网盘资源，BBS论坛系统 ERP管理系统 OA办公自动化管理系统 车辆管理系统 各种后台管理系统
Java,面试题,简历,Linux,大数据,常用开发工具类,API文档,电子书,各种思维导图资源,百度网盘资源BBS论坛系统 ERP管理系统 OA办公自动化管理系统 车辆管理系统 家庭理财系统 各种后 ...
随机推荐
- 0xWS2812 STM32 driver for WS2812(B) RGB LEDs
0xWS2812 STM32 driver for WS2812(B) RGB LEDs 0xWS2812 pronounced "hex-WS2812" This code ai ...
- STM32F4 -- How to use the DMA burst feature
Bits 15:13 Reserved, must be kept at reset value. Bits 12:8 DBL[4:0]: DMA burst length This 5-bit ve ...
- STM32的PWM输入模式设置并用DMA接收数据
参考 :STM32输入捕获模式设置并用DMA接收数据 PWM input mode This mode is a particular case of input capture mode. The ...
- epoll的LT和ET使用EPOLLONESHOT
epoll有两种触发的方式即LT(水平触发)和ET(边缘触发)两种,在前者,只要存在着事件就会不断的触发,直到处理完成,而后者只触发一次相同事件或者说只在从非触发到触发两个状态转换的时候儿才触发. 这 ...
- delphi GetKeyState
GetKeyState(VK_CAPITAL) & 0x0001 0x8000 是键有否按下0x0001 是键的翻转状态 var bF1Down: Boolean;begin bF1Down ...
- delphi 消息的使用
//分析结果 WM_AnalysisResult = WM_USER + 1009; SendMessage(G_MainHandle, WM_AnalysisResult, 0, 0); proce ...
- 为在Windows Azure上的网站配置自定义域名
本篇体验给Windows Azure上的网站自定义域名,首先"CNAME"和"A记录"是必须了解的概念. 假设,在Windows Azure上的网站域名是:x. ...
- SUSE Linux – Zypper 命令示例
來源:http://www.linuxidc.com/Linux/2014-11/109214.htm Zypper是SUSE Linux中用于安装,升级,卸载,管理仓库.进行各种包查询的命令行接口. ...
- 从CRITS发展历史解读结构框架
Michael Goffin 是MITRE公司的一名员工,在其博客中介绍了Crits 的发展历史.原文地址例如以下: CRITs: Collaborative Research Into Threat ...
- [Web 前端] this作用域问题
如何不用这种写法:理想的写法是this.setState({ .... }) 可能是我没有描述清楚,我不想用这种学法而已,这样多了一个变量,我觉得很不舒服.我尝试了先把 setState 赋值到变量里 ...