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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 = NULL;
- volatile bool dstBufIsTemp = false;
- JSAMPROW * volatile rowPointer = NULL;
-
- 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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