Merge pull request BradLarson#2293 from chenliming777/master

GPUImageFramebuffer  add  get   CVPixelBufferRef  method,  VideoToolB…

Author: BradLarson

framework/Source/GPUImageFramebuffer.h

@@ -54,5 +54,6 @@ typedef struct GPUTextureOptions {
 - (void)unlockAfterReading;
 - (NSUInteger)bytesPerRow;
 - (GLubyte *)byteBuffer;
+- (CVPixelBufferRef)pixelBuffer;
 
 @end

framework/Source/GPUImageFramebuffer.m

@@ -439,6 +439,15 @@ - (GLubyte *)byteBuffer;
 #endif
 }
 
+- (CVPixelBufferRef )pixelBuffer;
+{
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
+    return renderTarget;
+#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);