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/* Copyright (C) 2000-2003 Constantin Kaplinsky. All Rights Reserved. |
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* Copyright (C) 2004-2005 Cendio AB. All rights reserved. |
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* Copyright (C) 2011 D. R. Commander. All Rights Reserved. |
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* |
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* This is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This software is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this software; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
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* USA. |
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*/ |
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#include <rfb/JpegDecompressor.h> |
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#include <rdr/Exception.h> |
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#include <rfb/Rect.h> |
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#include <rfb/PixelFormat.h> |
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#include <stdio.h> |
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extern "C" { |
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#include <jpeglib.h> |
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} |
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#include <jerror.h> |
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#include <setjmp.h> |
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using namespace rfb; |
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// |
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// Error manager implmentation for the JPEG library |
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// |
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struct JPEG_ERROR_MGR { |
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struct jpeg_error_mgr pub; |
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jmp_buf jmpBuffer; |
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char lastError[JMSG_LENGTH_MAX]; |
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}; |
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static void |
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JpegErrorExit(j_common_ptr dinfo) |
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{ |
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JPEG_ERROR_MGR *err = (JPEG_ERROR_MGR *)dinfo->err; |
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(*dinfo->err->output_message)(dinfo); |
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longjmp(err->jmpBuffer, 1); |
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} |
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static void |
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JpegOutputMessage(j_common_ptr dinfo) |
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{ |
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JPEG_ERROR_MGR *err = (JPEG_ERROR_MGR *)dinfo->err; |
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(*dinfo->err->format_message)(dinfo, err->lastError); |
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} |
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// |
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// Source manager implementation for the JPEG library. |
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// |
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struct JPEG_SRC_MGR { |
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struct jpeg_source_mgr pub; |
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JpegDecompressor *instance; |
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}; |
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static void |
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JpegNoOp(j_decompress_ptr dinfo) |
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{ |
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} |
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static boolean |
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JpegFillInputBuffer(j_decompress_ptr dinfo) |
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{ |
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ERREXIT(dinfo, JERR_BUFFER_SIZE); |
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return TRUE; |
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} |
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static void |
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JpegSkipInputData(j_decompress_ptr dinfo, long num_bytes) |
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{ |
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JPEG_SRC_MGR *src = (JPEG_SRC_MGR *)dinfo->src; |
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if (num_bytes < 0 || (size_t)num_bytes > src->pub.bytes_in_buffer) { |
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ERREXIT(dinfo, JERR_BUFFER_SIZE); |
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} else { |
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src->pub.next_input_byte += (size_t) num_bytes; |
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src->pub.bytes_in_buffer -= (size_t) num_bytes; |
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} |
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} |
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JpegDecompressor::JpegDecompressor(void) |
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{ |
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dinfo = new jpeg_decompress_struct; |
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err = new struct JPEG_ERROR_MGR; |
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dinfo->err = jpeg_std_error(&err->pub); |
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snprintf(err->lastError, JMSG_LENGTH_MAX, "No error"); |
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err->pub.error_exit = JpegErrorExit; |
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err->pub.output_message = JpegOutputMessage; |
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if(setjmp(err->jmpBuffer)) { |
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// this will execute if libjpeg has an error |
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throw rdr::Exception(err->lastError); |
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} |
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jpeg_create_decompress(dinfo); |
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src = new struct JPEG_SRC_MGR; |
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src->pub.init_source = JpegNoOp; |
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src->pub.fill_input_buffer = JpegFillInputBuffer; |
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src->pub.skip_input_data = JpegSkipInputData; |
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src->pub.resync_to_restart = jpeg_resync_to_restart; |
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src->pub.term_source = JpegNoOp; |
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src->instance = this; |
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dinfo->src = (struct jpeg_source_mgr *)src; |
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} |
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JpegDecompressor::~JpegDecompressor(void) |
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{ |
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if(setjmp(err->jmpBuffer)) { |
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// this will execute if libjpeg has an error |
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return; |
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} |
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jpeg_destroy_decompress(dinfo); |
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delete err; |
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delete src; |
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delete dinfo; |
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} |
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void JpegDecompressor::decompress(const rdr::U8 *jpegBuf, int jpegBufLen, |
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rdr::U8 *buf, int pitch, const Rect& r, const PixelFormat& pf) |
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{ |
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int w = r.width(); |
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int h = r.height(); |
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int pixelsize; |
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int dstBufPitch; |
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rdr::U8 *dstBuf = NULL; |
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bool dstBufIsTemp = false; |
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JSAMPROW *rowPointer = NULL; |
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if(setjmp(err->jmpBuffer)) { |
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// this will execute if libjpeg has an error |
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jpeg_abort_decompress(dinfo); |
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if (dstBufIsTemp && dstBuf) delete[] dstBuf; |
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if (rowPointer) delete[] rowPointer; |
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throw rdr::Exception(err->lastError); |
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} |
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src->pub.next_input_byte = jpegBuf; |
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src->pub.bytes_in_buffer = jpegBufLen; |
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jpeg_read_header(dinfo, TRUE); |
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dinfo->out_color_space = JCS_RGB; |
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pixelsize = 3; |
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if (pitch == 0) pitch = w * pf.bpp / 8; |
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dstBufPitch = pitch; |
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#ifdef JCS_EXTENSIONS |
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// Try to have libjpeg output directly to our native format |
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if (pf.is888()) { |
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int redShift, greenShift, blueShift; |
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if(pf.bigEndian) { |
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redShift = 24 - pf.redShift; |
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greenShift = 24 - pf.greenShift; |
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blueShift = 24 - pf.blueShift; |
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} else { |
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redShift = pf.redShift; |
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greenShift = pf.greenShift; |
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blueShift = pf.blueShift; |
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} |
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// libjpeg can only handle some "standard" formats |
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if(redShift == 0 && greenShift == 8 && blueShift == 16) |
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dinfo->out_color_space = JCS_EXT_RGBX; |
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if(redShift == 16 && greenShift == 8 && blueShift == 0) |
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dinfo->out_color_space = JCS_EXT_BGRX; |
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if(redShift == 24 && greenShift == 16 && blueShift == 8) |
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dinfo->out_color_space = JCS_EXT_XBGR; |
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if(redShift == 8 && greenShift == 16 && blueShift == 24) |
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dinfo->out_color_space = JCS_EXT_XRGB; |
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if (dinfo->out_color_space != JCS_RGB) { |
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dstBuf = (rdr::U8 *)buf; |
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pixelsize = 4; |
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} |
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} |
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#endif |
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if (dinfo->out_color_space == JCS_RGB) { |
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dstBuf = new rdr::U8[w * h * pixelsize]; |
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dstBufIsTemp = true; |
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dstBufPitch = w * pixelsize; |
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} |
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rowPointer = new JSAMPROW[h]; |
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for (int dy = 0; dy < h; dy++) |
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rowPointer[dy] = (JSAMPROW)(&dstBuf[dy * dstBufPitch]); |
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jpeg_start_decompress(dinfo); |
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if (dinfo->output_width != (unsigned)r.width() |
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|| dinfo->output_height != (unsigned)r.height() |
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|| dinfo->output_components != pixelsize) { |
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jpeg_abort_decompress(dinfo); |
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if (dstBufIsTemp && dstBuf) delete[] dstBuf; |
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if (rowPointer) delete[] rowPointer; |
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throw rdr::Exception("Tight Decoding: Wrong JPEG data received.\n"); |
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} |
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while (dinfo->output_scanline < dinfo->output_height) { |
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jpeg_read_scanlines(dinfo, &rowPointer[dinfo->output_scanline], |
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dinfo->output_height - dinfo->output_scanline); |
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} |
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if (dinfo->out_color_space == JCS_RGB) |
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pf.bufferFromRGB((rdr::U8*)buf, dstBuf, w, pitch, h); |
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jpeg_finish_decompress(dinfo); |
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if (dstBufIsTemp) delete [] dstBuf; |
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delete[] rowPointer; |
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} |