PicHandle到CGImageRef

Question

該項目是具有核心圖形支持的通用C ++插件。 我無法將PicHandle成功轉換為CGImageRef。 從CFDataRef保存圖像會導致圖像損壞。

    if(pic)
{
    Handle thePictureFileHandle;
    thePictureFileHandle = NewHandleClear(512); 
    HandAndHand((Handle)pic,thePictureFileHandle);

    dataProvider= CGDataProviderCreateWithData(NULL,(void*)*thePictureFileHandle,GetHandleSize( (Handle)thePictureFileHandle ),NULL );
    CFDataRef data = CGDataProviderCopyData(dataProvider);
    CGImageSourceRef source = CGImageSourceCreateWithDataProvider(dataProvider, NULL);
    if ( source )
    {
        cgImageRef = CGImageSourceCreateImageAtIndex(source, 0, NULL);
    }
    CGDataProviderRelease(dataProvider);
    CFRelease( source );
    CFRelease( data );
}

Answer 1

在CGImageSourceCreateImageAtIndex ，您需要傳遞字典，說您的數據是PICT 。 請參閱此處的Apple文檔。 你需要做點什么

CFDictionaryRef   myOptions = NULL;
CFStringRef       myKeys[1];
CFTypeRef         myValues[1];

myKeys[0] = kCGImageSourceTypeIdentifierHint;
myValues[0] = (CFTypeRef)kUTTypePICT;
myOptions = CFDictionaryCreate(NULL, (const void **) myKeys,
               (const void **) myValues, 1,
               &kCFTypeDictionaryKeyCallBacks,
               & kCFTypeDictionaryValueCallBacks);

cgImageRef = CGImageSourceCreateImageAtIndex(source, 0, myOptions);

CFRelease(myOptions);