231 

   231 

   232     CFMutableDictionaryRef  visualContextOptions = CFDictionaryCreateMutable(kCFAllocatorDefault, 0,

   232     CFMutableDictionaryRef  visualContextOptions = CFDictionaryCreateMutable(kCFAllocatorDefault, 0,

   233                                                                              &kCFTypeDictionaryKeyCallBacks,

   233                                                                              &kCFTypeDictionaryKeyCallBacks,

   234                                                                              &kCFTypeDictionaryValueCallBacks);

   234                                                                              &kCFTypeDictionaryValueCallBacks);

   235     CFDictionarySetValue(visualContextOptions, kQTVisualContextPixelBufferAttributesKey, pixelBufferOptions);

   235     CFDictionarySetValue(visualContextOptions, kQTVisualContextPixelBufferAttributesKey, pixelBufferOptions);

   236     CFDictionarySetValue(visualContextOptions, kQTVisualContextWorkingColorSpaceKey, CGColorSpaceCreateDeviceRGB());

   237     CFDictionarySetValue(visualContextOptions, kQTVisualContextWorkingColorSpaceKey, CGColorSpaceCreateDeviceRGB());

   237 

   239 

   238     OSStatus err = QTPixelBufferContextCreate(kCFAllocatorDefault,

   240     OSStatus err = QTPixelBufferContextCreate(kCFAllocatorDefault,

   239                                                visualContextOptions,

   241                                                visualContextOptions,

   240                                                &m_visualContext);

   242                                                &m_visualContext);

   241     CFRelease(pixelBufferOptions);

   243     CFRelease(pixelBufferOptions);