1 files changed, 81 insertions, 0 deletions
diff --git a/libsgl/images/fpdfemb_ext.h b/libsgl/images/fpdfemb_ext.h
new file mode 100644
index 0000000..d82c4df
--- /dev/null
+++ b/libsgl/images/fpdfemb_ext.h
@@ -0,0 +1,81 @@
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Extended interfaces for JPEG, JPEG2000 and JBIG2 decoders **/
+typedef struct
+{
+	/** Initialize the decoding context, with memory allocator provided by FPDFEMB.
+	   Implementation should return a pointer to the decoding context.
+	*/
+	void*	(*Init)(void* (*alloc_func)(unsigned int), void (*free_func)(void*));
+
+	/** Finish with the decoding. */
+	void	(*Finish)(void* pContext);
+
+	/** Input JPEG encoded data from the source.
+		This function may be called multiple times during decoding progress.
+	*/
+	void	(*Input)(void* pContext, const unsigned char* src_buf, unsigned long src_size);
+
+	/** Read the header information. Return non-zero for success, 0 for failure */
+	int		(*ReadHeader)(void* pContext);
+
+	/** Get info from the decoder, including image width, height and number of components */
+	void	(*GetInfo)(void* pContext, int* width, int* height, int* nComps);
+
+	/** Read one scanline from decoded image */
+	int		(*ReadScanline)(void* pContext, unsigned char* dest_buf);
+
+	/** Get number of available source bytes left in the input stream */
+	unsigned long	(*GetAvailInput)(void* pContext);
+} FPDFEMB_JPEG_DECODER;
+
+void FPDFEMB_SetJpegDecoder(FPDFEMB_JPEG_DECODER* pDecoder);
+
+typedef struct 
+{
+	/** Initialize the decoder with the full source data.
+		Implementation should return a pointer to the context.
+	*/
+	void*	(*Init)(const unsigned char* src_buf, unsigned long src_size);
+
+	/** Destroy the context */
+	void	(*Finish)(void* context);
+
+	/** Get image info from the context, including width, height, number of components
+		in original codestream, and number of components in output image. For some
+		particular type of encoded image, like paletted image, these two numbers of 
+		components may vary.
+	*/
+	void	(*GetInfo)(void* context, unsigned long* width, unsigned long* height, 
+				unsigned long* codestream_nComps, unsigned long* output_nComps);
+
+	/** Do the real data decoding, output to a pre-allocated buffer.
+		bTranslateColor indicates whether the decoder should use JPEG2000 embedded
+		color space info to translate image into sRGB color space.
+		"offsets" array describes the byte order of all components. For example,
+		{2,1,0} means the first components is output to last byte.
+	*/
+	void	(*Decode)(void* context, unsigned char* dest_buf, int pitch, 
+				int bTranslateColor, unsigned char* offsets);
+} FPDFEMB_JPEG2000_DECODER;
+
+void FPDFEMB_SetJpeg2000Decoder(FPDFEMB_JPEG2000_DECODER* pDecoder);
+
+typedef struct
+{
+	/** Do the whole decoding process. Supplied parameters include width, height, source image
+		data and size, global data and size (can be shared among different images), destination
+		buffer and scanline pitch in dest buffer.
+	*/
+	void	(*Decode)(unsigned long width, unsigned long height, const unsigned char* src_buf,
+				unsigned long src_size, const unsigned char* global_buf, unsigned long global_size, 
+				unsigned char* dest_buf, int dest_pitch);
+} FPDFEMB_JBIG2_DECODER;
+
+void FPDFEMB_SetJbig2Decoder(FPDFEMB_JBIG2_DECODER* pDecoder);
+
+#ifdef __cplusplus
+};
+#endif