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