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- /* Copyright (C) 2002-2005 RealVNC Ltd. 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/JpegCompressor.h>
- #include <rdr/Exception.h>
- #include <rfb/Rect.h>
- #include <rfb/PixelFormat.h>
- #include <rfb/ClientParams.h>
-
- #include <stdio.h>
- extern "C" {
- #include <jpeglib.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 cinfo)
- {
- JPEG_ERROR_MGR *err = (JPEG_ERROR_MGR *)cinfo->err;
-
- (*cinfo->err->output_message)(cinfo);
- longjmp(err->jmpBuffer, 1);
- }
-
- static void
- JpegOutputMessage(j_common_ptr cinfo)
- {
- JPEG_ERROR_MGR *err = (JPEG_ERROR_MGR *)cinfo->err;
-
- (*cinfo->err->format_message)(cinfo, err->lastError);
- }
-
- //
- // Destination manager implementation for the JPEG library.
- //
-
- struct JPEG_DEST_MGR {
- struct jpeg_destination_mgr pub;
- JpegCompressor *instance;
- size_t chunkSize;
- };
-
- static void
- JpegInitDestination(j_compress_ptr cinfo)
- {
- JPEG_DEST_MGR *dest = (JPEG_DEST_MGR *)cinfo->dest;
- JpegCompressor *jc = dest->instance;
-
- jc->clear();
- dest->pub.next_output_byte = jc->getptr(jc->length());
- dest->pub.free_in_buffer = dest->chunkSize = jc->avail();
- }
-
- static boolean
- JpegEmptyOutputBuffer(j_compress_ptr cinfo)
- {
- JPEG_DEST_MGR *dest = (JPEG_DEST_MGR *)cinfo->dest;
- JpegCompressor *jc = dest->instance;
-
- jc->setptr(jc->avail());
- dest->pub.next_output_byte = jc->getptr(jc->length());
- dest->pub.free_in_buffer = dest->chunkSize = jc->avail();
-
- return TRUE;
- }
-
- static void
- JpegTermDestination(j_compress_ptr cinfo)
- {
- JPEG_DEST_MGR *dest = (JPEG_DEST_MGR *)cinfo->dest;
- JpegCompressor *jc = dest->instance;
-
- jc->setptr(dest->chunkSize - dest->pub.free_in_buffer);
- }
-
- JpegCompressor::JpegCompressor(int bufferLen) : MemOutStream(bufferLen)
- {
- cinfo = new jpeg_compress_struct;
-
- err = new struct JPEG_ERROR_MGR;
- cinfo->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_compress(cinfo);
-
- dest = new struct JPEG_DEST_MGR;
- dest->pub.init_destination = JpegInitDestination;
- dest->pub.empty_output_buffer = JpegEmptyOutputBuffer;
- dest->pub.term_destination = JpegTermDestination;
- dest->instance = this;
- cinfo->dest = (struct jpeg_destination_mgr *)dest;
- }
-
- JpegCompressor::~JpegCompressor(void)
- {
- if(setjmp(err->jmpBuffer)) {
- // this will execute if libjpeg has an error
- return;
- }
-
- jpeg_destroy_compress(cinfo);
-
- delete err;
- delete dest;
-
- delete cinfo;
- }
-
- void JpegCompressor::compress(const rdr::U8 *buf, int stride, const Rect& r,
- const PixelFormat& pf, int quality, int subsamp)
- {
- int w = r.width();
- int h = r.height();
- int pixelsize;
- rdr::U8 *srcBuf = NULL;
- bool srcBufIsTemp = false;
- JSAMPROW *rowPointer = NULL;
-
- if(setjmp(err->jmpBuffer)) {
- // this will execute if libjpeg has an error
- jpeg_abort_compress(cinfo);
- if (srcBufIsTemp && srcBuf) delete[] srcBuf;
- if (rowPointer) delete[] rowPointer;
- throw rdr::Exception("%s", err->lastError);
- }
-
- cinfo->image_width = w;
- cinfo->image_height = h;
- cinfo->in_color_space = JCS_RGB;
- pixelsize = 3;
-
- #ifdef JCS_EXTENSIONS
- // Try to have libjpeg output directly to our native format
- // libjpeg can only handle some "standard" formats
- if (pfRGBX.equal(pf))
- cinfo->in_color_space = JCS_EXT_RGBX;
- else if (pfBGRX.equal(pf))
- cinfo->in_color_space = JCS_EXT_BGRX;
- else if (pfXRGB.equal(pf))
- cinfo->in_color_space = JCS_EXT_XRGB;
- else if (pfXBGR.equal(pf))
- cinfo->in_color_space = JCS_EXT_XBGR;
-
- if (cinfo->in_color_space != JCS_RGB) {
- srcBuf = (rdr::U8 *)buf;
- pixelsize = 4;
- }
- #endif
-
- if (stride == 0)
- stride = w;
-
- if (cinfo->in_color_space == JCS_RGB) {
- srcBuf = new rdr::U8[w * h * pixelsize];
- srcBufIsTemp = true;
- pf.rgbFromBuffer(srcBuf, (const rdr::U8 *)buf, w, stride, h);
- stride = w;
- }
-
- cinfo->input_components = pixelsize;
-
- jpeg_set_defaults(cinfo);
-
- if (quality >= 1 && quality <= 100) {
- jpeg_set_quality(cinfo, quality, TRUE);
- if (quality >= 96)
- cinfo->dct_method = JDCT_ISLOW;
- else
- cinfo->dct_method = JDCT_FASTEST;
- }
-
- switch (subsamp) {
- case subsample16X:
- case subsample8X:
- // FIXME (fall through)
- case subsample4X:
- cinfo->comp_info[0].h_samp_factor = 2;
- cinfo->comp_info[0].v_samp_factor = 2;
- break;
- case subsample2X:
- cinfo->comp_info[0].h_samp_factor = 2;
- cinfo->comp_info[0].v_samp_factor = 1;
- break;
- case subsampleGray:
- jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
- default:
- cinfo->comp_info[0].h_samp_factor = 1;
- cinfo->comp_info[0].v_samp_factor = 1;
- }
-
- rowPointer = new JSAMPROW[h];
- for (int dy = 0; dy < h; dy++)
- rowPointer[dy] = (JSAMPROW)(&srcBuf[dy * stride * pixelsize]);
-
- jpeg_start_compress(cinfo, TRUE);
- while (cinfo->next_scanline < cinfo->image_height)
- jpeg_write_scanlines(cinfo, &rowPointer[cinfo->next_scanline],
- cinfo->image_height - cinfo->next_scanline);
-
- jpeg_finish_compress(cinfo);
-
- if (srcBufIsTemp) delete[] srcBuf;
- delete[] rowPointer;
- }
-
- void JpegCompressor::writeBytes(const void* data, int length)
- {
- throw rdr::Exception("writeBytes() is not valid with a JpegCompressor instance. Use compress() instead.");
- }
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