godot/thirdparty/jpeg-compressor/jpgd.h

// jpgd.h - C++ class for JPEG decompression.
// Richard Geldreich <[email protected]>
// See jpgd.cpp for license (Public Domain or Apache 2.0).
#ifndef JPEG_DECODER_H
#define JPEG_DECODER_H

#include <stdlib.h>
#include <stdio.h>
#include <setjmp.h>
#include <assert.h>
#include <stdint.h>

#ifdef _MSC_VER
#define JPGD_NORETURN … 
#elif defined(__GNUC__)
#define JPGD_NORETURN …
#else
#define JPGD_NORETURN
#endif

#define JPGD_HUFF_TREE_MAX_LENGTH …
#define JPGD_HUFF_CODE_SIZE_MAX_LENGTH …

namespace jpgd
{
	uint8;
	int16;
	uint16;
	uint;
	int32;

	// Loads a JPEG image from a memory buffer or a file.
	// req_comps can be 1 (grayscale), 3 (RGB), or 4 (RGBA).
	// On return, width/height will be set to the image's dimensions, and actual_comps will be set to the either 1 (grayscale) or 3 (RGB).
	// Notes: For more control over where and how the source data is read, see the decompress_jpeg_image_from_stream() function below, or call the jpeg_decoder class directly.
	// Requesting a 8 or 32bpp image is currently a little faster than 24bpp because the jpeg_decoder class itself currently always unpacks to either 8 or 32bpp.
	unsigned char* decompress_jpeg_image_from_memory(const unsigned char* pSrc_data, int src_data_size, int* width, int* height, int* actual_comps, int req_comps, uint32_t flags = 0);
	unsigned char* decompress_jpeg_image_from_file(const char* pSrc_filename, int* width, int* height, int* actual_comps, int req_comps, uint32_t flags = 0);

	// Success/failure error codes.
	enum jpgd_status
	{ … };

	// Input stream interface.
	// Derive from this class to read input data from sources other than files or memory. Set m_eof_flag to true when no more data is available.
	// The decoder is rather greedy: it will keep on calling this method until its internal input buffer is full, or until the EOF flag is set.
	// It the input stream contains data after the JPEG stream's EOI (end of image) marker it will probably be pulled into the internal buffer.
	// Call the get_total_bytes_read() method to determine the actual size of the JPEG stream after successful decoding.
	class jpeg_decoder_stream
	{ … };

	// stdio FILE stream class.
	class jpeg_decoder_file_stream : public jpeg_decoder_stream
	{ … };

	// Memory stream class.
	class jpeg_decoder_mem_stream : public jpeg_decoder_stream
	{ … };

	// Loads JPEG file from a jpeg_decoder_stream.
	unsigned char* decompress_jpeg_image_from_stream(jpeg_decoder_stream* pStream, int* width, int* height, int* actual_comps, int req_comps, uint32_t flags = 0);

	enum
	{ … };

	jpgd_quant_t;
	jpgd_block_coeff_t;

	class jpeg_decoder
	{ … };

} // namespace jpgd

#endif // JPEG_DECODER_H