Jay Sorg
12 years ago
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8db6dd3f77
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6333cdd865
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/*
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This program 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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This program 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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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xrdp: A Remote Desktop Protocol server.
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Copyright (C) Jay Sorg 2012
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jpeg compressor
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*/
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#include "libxrdp.h"
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#if defined(XRDP_JPEG)
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <jpeglib.h>
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#define JP_QUALITY 75
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struct mydata_comp
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{
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char* cb;
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int cb_bytes;
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int total_done;
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int overwrite;
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};
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/*****************************************************************************/
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/* called at begining */
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static void DEFAULT_CC
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my_init_destination(j_compress_ptr cinfo)
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{
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struct mydata_comp* md;
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md = (struct mydata_comp*)(cinfo->client_data);
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md->total_done = 0;
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md->overwrite = 0;
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cinfo->dest->next_output_byte = md->cb;
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cinfo->dest->free_in_buffer = md->cb_bytes;
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}
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/*****************************************************************************/
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/* called when buffer is full and we need more space */
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static int DEFAULT_CC
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my_empty_output_buffer(j_compress_ptr cinfo)
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{
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struct mydata_comp* md;
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int chunk_bytes;
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md = (struct mydata_comp*)(cinfo->client_data);
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chunk_bytes = md->cb_bytes;
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md->total_done += chunk_bytes;
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cinfo->dest->next_output_byte = md->cb;
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cinfo->dest->free_in_buffer = md->cb_bytes;
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md->overwrite = 1;
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return 1;
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}
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/*****************************************************************************/
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/* called at end */
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static void DEFAULT_CC
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my_term_destination(j_compress_ptr cinfo)
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{
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struct mydata_comp* md;
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int chunk_bytes;
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md = (struct mydata_comp*)(cinfo->client_data);
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chunk_bytes = md->cb_bytes - cinfo->dest->free_in_buffer;
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md->total_done += chunk_bytes;
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}
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/*****************************************************************************/
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static int APP_CC
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jp_do_compress(char* data, int width, int height, int bpp, int quality,
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char* comp_data, int* comp_data_bytes)
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{
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struct jpeg_compress_struct cinfo;
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struct jpeg_error_mgr jerr;
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struct jpeg_destination_mgr dst_mgr;
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struct mydata_comp md;
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JSAMPROW row_pointer[4];
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int Bpp;
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Bpp = (bpp + 7) / 8;
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memset(&cinfo, 0, sizeof(cinfo));
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cinfo.err = jpeg_std_error(&jerr);
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jpeg_create_compress(&cinfo);
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memset(&md, 0, sizeof(md));
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md.cb = comp_data,
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md.cb_bytes = *comp_data_bytes;
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cinfo.client_data = &md;
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memset(&dst_mgr, 0, sizeof(dst_mgr));
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dst_mgr.init_destination = my_init_destination;
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dst_mgr.empty_output_buffer = my_empty_output_buffer;
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dst_mgr.term_destination = my_term_destination;
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cinfo.dest = &dst_mgr;
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cinfo.image_width = width;
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cinfo.image_height = height;
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cinfo.input_components = Bpp;
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cinfo.in_color_space = JCS_RGB;
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jpeg_set_defaults(&cinfo);
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cinfo.num_components = 3;
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cinfo.dct_method = JDCT_FLOAT;
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jpeg_set_quality(&cinfo, quality, 1);
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jpeg_start_compress(&cinfo, 1);
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while (cinfo.next_scanline + 3 < cinfo.image_height)
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{
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row_pointer[0] = data;
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data += width * Bpp;
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row_pointer[1] = data;
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data += width * Bpp;
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row_pointer[2] = data;
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data += width * Bpp;
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row_pointer[3] = data;
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data += width * Bpp;
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jpeg_write_scanlines(&cinfo, row_pointer, 4);
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}
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while (cinfo.next_scanline < cinfo.image_height)
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{
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row_pointer[0] = data;
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data += width * Bpp;
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jpeg_write_scanlines(&cinfo, row_pointer, 1);
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}
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jpeg_finish_compress(&cinfo);
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*comp_data_bytes = md.total_done;
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jpeg_destroy_compress(&cinfo);
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if (md.overwrite)
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{
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return 1;
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}
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return 0;
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}
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/*****************************************************************************/
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static int APP_CC
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jpeg_compress(char* in_data, int width, int height,
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struct stream* s, int bpp, int byte_limit,
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int start_line, struct stream* temp_s,
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int e)
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{
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char* data;
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tui32* src32;
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tui16* src16;
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tui8* dst8;
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tui32 pixel;
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int red;
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int blue;
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int green;
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int j;
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int i;
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int cdata_bytes;
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data = g_malloc((width + e) * height * 3, 0);
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dst8 = data;
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if (bpp == 24)
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{
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src32 = (tui32*)in_data;
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for (j = 0; j < height; j++)
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{
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for (i = 0; i < width; i++)
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{
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pixel = src32[i + j * width];
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SPLITCOLOR32(red, green, blue, pixel);
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*(dst8++)= blue;
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*(dst8++)= green;
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*(dst8++)= red;
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}
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for (i = 0; i < e; i++)
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{
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*(dst8++) = blue;
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*(dst8++) = green;
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*(dst8++) = red;
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}
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}
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}
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else
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{
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g_writeln("bpp wrong %d", bpp);
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}
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cdata_bytes = byte_limit;
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jp_do_compress(data, width + e, height, 24, JP_QUALITY, s->p, &cdata_bytes);
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s->p += cdata_bytes;
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g_free(data);
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return cdata_bytes;
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}
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/*****************************************************************************/
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int APP_CC
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xrdp_jpeg_compress(char* in_data, int width, int height,
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struct stream* s, int bpp, int byte_limit,
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int start_line, struct stream* temp_s,
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int e)
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{
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jpeg_compress(in_data, width, height, s, bpp, byte_limit,
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start_line, temp_s, e);
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return height;
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}
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#else
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/*****************************************************************************/
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int APP_CC
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xrdp_jpeg_compress(char* in_data, int width, int height,
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struct stream* s, int bpp, int byte_limit,
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int start_line, struct stream* temp_s,
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int e)
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{
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return height;
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}
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#endif
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