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/* Copyright (C) 2000-2003 Constantin Kaplinsky. All Rights Reserved.
* Copyright (C) 2004-2005 Cendio AB. All rights reserved.
* Copyright (C) 2011 D. R. Commander. All Rights Reserved.
* Copyright 2014 Pierre Ossman for Cendio AB
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <rfb/JpegDecompressor.h>
#include <rdr/Exception.h>
#include <rfb/Rect.h>
#include <rfb/PixelFormat.h>
#include <stdio.h>
extern "C" {
#include <jpeglib.h>
}
#include <jerror.h>
#include <setjmp.h>
using namespace rfb;
//
// Special formats that libjpeg can have optimised code paths for
//
static const PixelFormat pfRGBX(32, 24, false, true, 255, 255, 255, 0, 8, 16);
static const PixelFormat pfBGRX(32, 24, false, true, 255, 255, 255, 16, 8, 0);
static const PixelFormat pfXRGB(32, 24, false, true, 255, 255, 255, 8, 16, 24);
static const PixelFormat pfXBGR(32, 24, false, true, 255, 255, 255, 24, 16, 8);
//
// Error manager implementation for the JPEG library
//
struct JPEG_ERROR_MGR {
struct jpeg_error_mgr pub;
jmp_buf jmpBuffer;
char lastError[JMSG_LENGTH_MAX];
};
static void
JpegErrorExit(j_common_ptr dinfo)
{
JPEG_ERROR_MGR *err = (JPEG_ERROR_MGR *)dinfo->err;
(*dinfo->err->output_message)(dinfo);
longjmp(err->jmpBuffer, 1);
}
static void
JpegOutputMessage(j_common_ptr dinfo)
{
JPEG_ERROR_MGR *err = (JPEG_ERROR_MGR *)dinfo->err;
(*dinfo->err->format_message)(dinfo, err->lastError);
}
//
// Source manager implementation for the JPEG library.
//
struct JPEG_SRC_MGR {
struct jpeg_source_mgr pub;
JpegDecompressor *instance;
};
static void
JpegNoOp(j_decompress_ptr /*dinfo*/)
{
}
static boolean
JpegFillInputBuffer(j_decompress_ptr dinfo)
{
ERREXIT(dinfo, JERR_BUFFER_SIZE);
return TRUE;
}
static void
JpegSkipInputData(j_decompress_ptr dinfo, long num_bytes)
{
JPEG_SRC_MGR *src = (JPEG_SRC_MGR *)dinfo->src;
if (num_bytes < 0 || (size_t)num_bytes > src->pub.bytes_in_buffer) {
ERREXIT(dinfo, JERR_BUFFER_SIZE);
} else {
src->pub.next_input_byte += (size_t) num_bytes;
src->pub.bytes_in_buffer -= (size_t) num_bytes;
}
}
JpegDecompressor::JpegDecompressor(void)
{
dinfo = new jpeg_decompress_struct;
err = new struct JPEG_ERROR_MGR;
dinfo->err = jpeg_std_error(&err->pub);
snprintf(err->lastError, JMSG_LENGTH_MAX, "No error");
err->pub.error_exit = JpegErrorExit;
err->pub.output_message = JpegOutputMessage;
if(setjmp(err->jmpBuffer)) {
// this will execute if libjpeg has an error
throw rdr::Exception("%s", err->lastError);
}
jpeg_create_decompress(dinfo);
src = new struct JPEG_SRC_MGR;
src->pub.init_source = JpegNoOp;
src->pub.fill_input_buffer = JpegFillInputBuffer;
src->pub.skip_input_data = JpegSkipInputData;
src->pub.resync_to_restart = jpeg_resync_to_restart;
src->pub.term_source = JpegNoOp;
src->instance = this;
dinfo->src = (struct jpeg_source_mgr *)src;
}
JpegDecompressor::~JpegDecompressor(void)
{
if(setjmp(err->jmpBuffer)) {
// this will execute if libjpeg has an error
return;
}
jpeg_destroy_decompress(dinfo);
delete err;
delete src;
delete dinfo;
}
void JpegDecompressor::decompress(const uint8_t *jpegBuf,
int jpegBufLen, uint8_t *buf,
volatile int stride,
const Rect& r, const PixelFormat& pf)
{
int w = r.width();
int h = r.height();
int pixelsize;
int dstBufStride;
uint8_t * volatile dstBuf = nullptr;
volatile bool dstBufIsTemp = false;
JSAMPROW * volatile rowPointer = nullptr;
if(setjmp(err->jmpBuffer)) {
// this will execute if libjpeg has an error
jpeg_abort_decompress(dinfo);
if (dstBufIsTemp && dstBuf) delete[] dstBuf;
if (rowPointer) delete[] rowPointer;
throw rdr::Exception("%s", err->lastError);
}
src->pub.next_input_byte = jpegBuf;
src->pub.bytes_in_buffer = jpegBufLen;
jpeg_read_header(dinfo, TRUE);
dinfo->out_color_space = JCS_RGB;
pixelsize = 3;
if (stride == 0)
stride = w;
dstBufStride = stride;
#ifdef JCS_EXTENSIONS
// Try to have libjpeg output directly to our native format
// libjpeg can only handle some "standard" formats
if (pfRGBX == pf)
dinfo->out_color_space = JCS_EXT_RGBX;
else if (pfBGRX == pf)
dinfo->out_color_space = JCS_EXT_BGRX;
else if (pfXRGB == pf)
dinfo->out_color_space = JCS_EXT_XRGB;
else if (pfXBGR == pf)
dinfo->out_color_space = JCS_EXT_XBGR;
if (dinfo->out_color_space != JCS_RGB) {
dstBuf = (uint8_t *)buf;
pixelsize = 4;
}
#endif
if (dinfo->out_color_space == JCS_RGB) {
dstBuf = new uint8_t[w * h * pixelsize];
dstBufIsTemp = true;
dstBufStride = w;
}
rowPointer = new JSAMPROW[h];
for (int dy = 0; dy < h; dy++)
rowPointer[dy] = (JSAMPROW)(&dstBuf[dy * dstBufStride * pixelsize]);
jpeg_start_decompress(dinfo);
if (dinfo->output_width != (unsigned)r.width()
|| dinfo->output_height != (unsigned)r.height()
|| dinfo->output_components != pixelsize) {
jpeg_abort_decompress(dinfo);
if (dstBufIsTemp && dstBuf) delete[] dstBuf;
if (rowPointer) delete[] rowPointer;
throw rdr::Exception("Tight Decoding: Wrong JPEG data received.\n");
}
while (dinfo->output_scanline < dinfo->output_height) {
jpeg_read_scanlines(dinfo, &rowPointer[dinfo->output_scanline],
dinfo->output_height - dinfo->output_scanline);
}
if (dinfo->out_color_space == JCS_RGB)
pf.bufferFromRGB((uint8_t*)buf, dstBuf, w, stride, h);
jpeg_finish_decompress(dinfo);
if (dstBufIsTemp) delete [] dstBuf;
delete[] rowPointer;
}
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