On 26 Aug, 2013, at 18:49 , Graham Cox <[email protected]> wrote:
> I'm working on a parser that needs to be able to extract graphics from PDF
> files. So far, I'm making good headway with the CGPDFxxx functions.
>
> I have a question about extracting embedded bitmap images. When I encounter
> an XObject stream with subType /Image, I get a bunch of parameters that looks
> pretty close to the parameters to CGImageCreate. However, the 'Filter'
> parameter indicates /FlateDecode so I'm assuming that I can't just wrap the
> stream in a CFDataRef and then in a CFDataProvider - I'll need to actually
> decompress this data first using (according to PDF spec) zlib/deflate.
>
> Am I right? Anyone got any sample code or hints regarding how to go about
> this?
No, you shouldn't need to decompress it. Something like the following should
get you the data:
[…snip…]
imageDataPtr = CGPDFStreamCopyData(dataStream, &format);
dataProvider = CGDataProviderCreateWithCFData(imageDataPtr);
CFRelease(imageDataPtr);
[…snip…]
Message me privately if you want some more help with this Graham.
-António
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it grows stronger through being used.
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