Wow I'm sorry I should have mentioned I'm doing this on iPhone
On May 31, 2010, at 11:11 AM, Development wrote:
> Ok... I'm really new to coregraphics and i've run in to a problem i cant seem
> to figure out.
> I'm trying to take page data from a pdf and draw a thumbnail size preview...
> I'm first drawing this to a UIView, then creating CGImageRef from that and
> finally converting it to a UIImage.
>
> What I get is a black rectangle of scrambled colors and no discernible
> resemblance to the page data.
>
> self.backgroundColor = [UIColor whiteColor];
> float scale=1.0;
>
> CGRect pageRect = CGPDFPageGetBoxRect(thePage,0);
>
> if (pageRect.size.width > pageRect.size.height) {
>
> scale = self.imgSize/pageRect.size.width;
> }
>
> else {
> scale = self.imgSize/pageRect.size.height;
> }
>
>
> CGRect myBounds = self.bounds;
>
> myBounds.size.width =pageRect.size.width *scale;
> myBounds.size.height = pageRect.size.height *scale;
>
> self.bounds = myBounds;
>
> int bytesPerRow = myBounds.size.width*4;
> bytesPerRow += (16 - bytesPerRow%16)%16;
> size_t byteSize = bytesPerRow * myBounds.size.height;
> void * bitmapData = malloc(byteSize); ag
>
>
> CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
>
> CGContextRef context =
> CGBitmapContextCreate(bitmapData,myBounds.size.width,myBounds.size.height,8,bytesPerRow,colorSpace,kCGImageAlphaNoneSkipFirst
> | kCGBitmapByteOrder32Little/*kCGImageAlphaPremultipliedFirst*/);
>
> CGContextTranslateCTM(context, 0.0, self.bounds.size.height);
> CGContextScaleCTM(context, 1.0, -1.0);
> CGContextSetPatternPhase(context, CGSizeMake(0,myBounds.size.height));
>
> CGAffineTransform pdfTransform = CGPDFPageGetDrawingTransform(thePage,
> kCGPDFCropBox, myBounds, 0, true);
> CGContextConcatCTM(context, pdfTransform);
> CGContextDrawPDFPage(context, thePage);
>
> CGImageRef testImage = CGBitmapContextCreateImage(context);
> thumb = [[UIImageView alloc]initWithImage:[UIImage
> imageWithCGImage:testImage]];
>
>
> CGColorSpaceRelease(colorSpace);_______________________________________________
>
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