view release on metacpan or  search on metacpan

src/Source/FreeImage/PluginJXR.cpp  view on Meta::CPAN

}

static BOOL DLL_CALLCONV
SupportsNoPixels() {
	return TRUE;
}

// ==========================================================
//	Open & Close
// ==========================================================

static void * DLL_CALLCONV
Open(FreeImageIO *io, fi_handle handle, BOOL read) {
	WMPStream *pStream = NULL;	// stream interface
	if(io && handle) {
		// allocate the FreeImageIO stream wrapper
		FreeImageJXRIO *jxr_io = (FreeImageJXRIO*)malloc(sizeof(FreeImageJXRIO));
		if(jxr_io) {
			jxr_io->io = io;
			jxr_io->handle = handle;
			// create a JXR stream wrapper
			if(_jxr_io_Create(&pStream, jxr_io) != WMP_errSuccess) {
				free(jxr_io);
				return NULL;
			}
		}
	}
	return pStream;
}

static void DLL_CALLCONV
Close(FreeImageIO *io, fi_handle handle, void *data) {
	WMPStream *pStream = (WMPStream*)data;
	if(pStream) {
		// free the FreeImageIO stream wrapper
		FreeImageJXRIO *jxr_io = (FreeImageJXRIO*)pStream->state.pvObj;
		free(jxr_io);
		// free the JXR stream wrapper
		pStream->fMem = TRUE;
		_jxr_io_Close(&pStream);
	}
}

// ==========================================================
//	Load
// ==========================================================

/**
Set decoder parameters
@param pDecoder Decoder handle
@param flags FreeImage load flags
*/
static void 
SetDecoderParameters(PKImageDecode *pDecoder, int flags) {
	// load image & alpha for formats with alpha
	pDecoder->WMP.wmiSCP.uAlphaMode = 2;
	// more options to come ...
}

/**
Copy or convert & copy decoded pixels into the dib
@param pDecoder Decoder handle
@param out_guid_format Target guid format
@param dib Output dib
@param width Image width
@param height Image height
@return Returns 0 if successful, returns ERR otherwise
*/
static ERR
CopyPixels(PKImageDecode *pDecoder, PKPixelFormatGUID out_guid_format, FIBITMAP *dib, int width, int height) {
	PKFormatConverter *pConverter = NULL;	// pixel format converter
	ERR error_code = 0;	// error code as returned by the interface
	BYTE *pb = NULL;	// local buffer used for pixel format conversion
	
	// image dimensions
	const PKRect rect = {0, 0, width, height};

	try {
		// get input file pixel format ...
		PKPixelFormatGUID in_guid_format;
		error_code = pDecoder->GetPixelFormat(pDecoder, &in_guid_format);
		JXR_CHECK(error_code);
		
		// is a format conversion needed ?

		if(IsEqualGUID(out_guid_format, in_guid_format)) {
			// no conversion, load bytes "as is" ...

			// get a pointer to dst pixel data
			BYTE *dib_bits = FreeImage_GetBits(dib);

			// get dst pitch (count of BYTE for stride)
			const unsigned cbStride = FreeImage_GetPitch(dib);			

			// decode and copy bits to dst array
			error_code = pDecoder->Copy(pDecoder, &rect, dib_bits, cbStride);
			JXR_CHECK(error_code);		
		}
		else {
			// we need to use the conversion API ...
			
			// allocate the pixel format converter
			error_code = PKCodecFactory_CreateFormatConverter(&pConverter);
			JXR_CHECK(error_code);
			
			// set the conversion function
			error_code = pConverter->Initialize(pConverter, pDecoder, NULL, out_guid_format);
			JXR_CHECK(error_code);
			
			// get the maximum stride
			unsigned cbStride = 0;
			{
				PKPixelInfo pPIFrom;
				PKPixelInfo pPITo;
				
				pPIFrom.pGUIDPixFmt = &in_guid_format;
				error_code = PixelFormatLookup(&pPIFrom, LOOKUP_FORWARD);
				JXR_CHECK(error_code);

				pPITo.pGUIDPixFmt = &out_guid_format;
				error_code = PixelFormatLookup(&pPITo, LOOKUP_FORWARD);