vnc-enc-tight.c

/*
 * QEMU VNC display driver: tight encoding
 *
 * From libvncserver/libvncserver/tight.c
 * Copyright (C) 2000, 2001 Const Kaplinsky.  All Rights Reserved.
 * Copyright (C) 1999 AT&T Laboratories Cambridge.  All Rights Reserved.
 *
 * Copyright (C) 2010 Corentin Chary <corentin.chary@gmail.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu/osdep.h"

/* This needs to be before jpeglib.h line because of conflict with
   INT32 definitions between jmorecfg.h (included by jpeglib.h) and
   Win32 basetsd.h (included by windows.h). */

#ifdef CONFIG_VNC_PNG
/* The following define is needed by pngconf.h. Otherwise it won't compile,
   because setjmp.h was already included by osdep.h. */
#define PNG_SKIP_SETJMP_CHECK
#include <png.h>
#endif
#ifdef CONFIG_VNC_JPEG
#include <jpeglib.h>
#endif

#include "qemu/bswap.h"
#include "vnc.h"
#include "vnc-enc-tight.h"
#include "vnc-palette.h"

/* Compression level stuff. The following array contains various
   encoder parameters for each of 10 compression levels (0..9).
   Last three parameters correspond to JPEG quality levels (0..9). */

static const struct {
    int max_rect_size, max_rect_width;
    int mono_min_rect_size, gradient_min_rect_size;
    int idx_zlib_level, mono_zlib_level, raw_zlib_level, gradient_zlib_level;
    int gradient_threshold, gradient_threshold24;
    int idx_max_colors_divisor;
    int jpeg_quality, jpeg_threshold, jpeg_threshold24;
} tight_conf[] = {
    {   512,   32,   6, 65536, 0, 0, 0, 0,   0,   0,   4,  5, 10000, 23000 },
    {  2048,  128,   6, 65536, 1, 1, 1, 0,   0,   0,   8, 10,  8000, 18000 },
    {  6144,  256,   8, 65536, 3, 3, 2, 0,   0,   0,  24, 15,  6500, 15000 },
    { 10240, 1024,  12, 65536, 5, 5, 3, 0,   0,   0,  32, 25,  5000, 12000 },
    { 16384, 2048,  12, 65536, 6, 6, 4, 0,   0,   0,  32, 37,  4000, 10000 },
    { 32768, 2048,  12,  4096, 7, 7, 5, 4, 150, 380,  32, 50,  3000,  8000 },
    { 65536, 2048,  16,  4096, 7, 7, 6, 4, 170, 420,  48, 60,  2000,  5000 },
    { 65536, 2048,  16,  4096, 8, 8, 7, 5, 180, 450,  64, 70,  1000,  2500 },
    { 65536, 2048,  32,  8192, 9, 9, 8, 6, 190, 475,  64, 75,   500,  1200 },