OSStatus GeneratePreviewForURL(void *thisInterface, QLPreviewRequestRef preview, CFURLRef url, CFStringRef contentTypeUTI, CFDictionaryRef options)
{
CGDataProviderRef dataProvider = CGDataProviderCreateWithURL(url);
if (!dataProvider) return -1;
CFDataRef data = CGDataProviderCopyData(dataProvider);
CGDataProviderRelease(dataProvider);
if (!data) return -1;
int width, height, channels;
unsigned char* rgbadata = SOIL_load_image_from_memory(CFDataGetBytePtr(data), CFDataGetLength(data), &width, &height, &channels, SOIL_LOAD_RGBA);
CFStringRef format=CFStringCreateWithBytes(NULL, CFDataGetBytePtr(data) + 0x54, 4, kCFStringEncodingASCII, false);
CFRelease(data);
if (!rgbadata) return -1;
CGColorSpaceRef rgb = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(rgbadata, width, height, 8, width * 4, rgb, kCGImageAlphaPremultipliedLast);
SOIL_free_image_data(rgbadata);
CGColorSpaceRelease(rgb);
if (!context) return -1;
CGImageRef image = CGBitmapContextCreateImage(context);
CGContextRelease(context);
if (!image) return -1;
/* Add basic metadata to title */
CFStringRef name = CFURLCopyLastPathComponent(url);
CFTypeRef keys[1] = {kQLPreviewPropertyDisplayNameKey};
CFTypeRef values[1] = {CFStringCreateWithFormat(NULL, NULL, CFSTR("%@ (%dx%d %@)"), name, width, height, format)};
CFDictionaryRef properties = CFDictionaryCreate(NULL, (const void**)keys, (const void**)values, 1, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
CFRelease(name);
context = QLPreviewRequestCreateContext(preview, CGSizeMake(width, height), true, properties);
CGContextDrawImage(context, CGRectMake(0, 0, width, height), image);
QLPreviewRequestFlushContext(preview, context);
CGContextRelease(context);
CFRelease(format);
CFRelease(properties);
return noErr;
}
OSStatus GeneratePreviewForURL(void *thisInterface, QLPreviewRequestRef preview, CFURLRef url, CFStringRef contentTypeUTI, CFDictionaryRef options)
{
if (url == NULL)
{
return -1;
}
//fprintf(stderr, "GeneratePreviewForURL\n");
CGImageRef imageRef = GetPngImage(url, contentTypeUTI);
if (imageRef != NULL)
{
CGSize contextSize = CGSizeMake(CGImageGetWidth(imageRef), CGImageGetHeight(imageRef));
float ratio = contextSize.width / contextSize.height;
//fprintf(stderr, "imageSize: %fx%f, ratio: %f\n", contextSize.width, contextSize.height, ratio);
if ((contextSize.width > MAX_SIZE) || (contextSize.height > MAX_SIZE))
{
if (contextSize.width > contextSize.height)
{
contextSize.width = MAX_SIZE;
contextSize.height = MAX_SIZE/ratio;
}
else
{
contextSize.width = MAX_SIZE*ratio;
contextSize.height = MAX_SIZE;
}
}
else if ((contextSize.width < MIN_SIZE) || (contextSize.height < MIN_SIZE))
{
if (contextSize.width < contextSize.height)
{
contextSize.width = MIN_SIZE;
contextSize.height = MIN_SIZE/ratio;
}
else
{
contextSize.width = MIN_SIZE*ratio;
contextSize.height = MIN_SIZE;
}
if ((contextSize.width > MAX_SIZE) || (contextSize.height > MAX_SIZE))
{
if (contextSize.width > contextSize.height)
{
contextSize.width = MAX_SIZE;
contextSize.height = MAX_SIZE/ratio;
}
else
{
contextSize.width = MAX_SIZE*ratio;
contextSize.height = MAX_SIZE;
}
}
}
//fprintf(stderr, "contextSize: %fx%f\n", contextSize.width, contextSize.height);
CGContextRef cgContext = QLPreviewRequestCreateContext(preview, contextSize, TRUE, NULL);
if (cgContext != NULL)
{
CGContextSaveGState(cgContext);
{
CGRect contextRect = CGRectMake(0, 0, contextSize.width, contextSize.height);
CGContextDrawImage(cgContext, contextRect, imageRef);
}
CGContextRestoreGState(cgContext);
QLPreviewRequestFlushContext(preview, cgContext);
CFRelease(cgContext);
}
CFRelease(imageRef);
}
return noErr;
}
