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aa7d73fd3d
Add palette tight encoding. Palette encoding will try to count the number of colors for a given rectangle, and if this number is low enough (< 256) it will send the palette + the rectangle with indexed colors. Signed-off-by: Corentin Chary <corentincj@iksaif.net> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
962 lines
36 KiB
C
962 lines
36 KiB
C
/*
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* QEMU VNC display driver: tight encoding
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*
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* From libvncserver/libvncserver/tight.c
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* Copyright (C) 2000, 2001 Const Kaplinsky. All Rights Reserved.
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* Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
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*
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* Copyright (C) 2010 Corentin Chary <corentin.chary@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdbool.h>
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#include "qdict.h"
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#include "qint.h"
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#include "vnc.h"
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#include "vnc-encoding-tight.h"
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/* Compression level stuff. The following array contains various
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encoder parameters for each of 10 compression levels (0..9).
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Last three parameters correspond to JPEG quality levels (0..9). */
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static const struct {
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int max_rect_size, max_rect_width;
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int mono_min_rect_size, gradient_min_rect_size;
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int idx_zlib_level, mono_zlib_level, raw_zlib_level, gradient_zlib_level;
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int gradient_threshold, gradient_threshold24;
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int idx_max_colors_divisor;
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int jpeg_quality, jpeg_threshold, jpeg_threshold24;
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} tight_conf[] = {
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{ 512, 32, 6, 65536, 0, 0, 0, 0, 0, 0, 4, 5, 10000, 23000 },
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{ 2048, 128, 6, 65536, 1, 1, 1, 0, 0, 0, 8, 10, 8000, 18000 },
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{ 6144, 256, 8, 65536, 3, 3, 2, 0, 0, 0, 24, 15, 6500, 15000 },
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{ 10240, 1024, 12, 65536, 5, 5, 3, 0, 0, 0, 32, 25, 5000, 12000 },
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{ 16384, 2048, 12, 65536, 6, 6, 4, 0, 0, 0, 32, 37, 4000, 10000 },
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{ 32768, 2048, 12, 4096, 7, 7, 5, 4, 150, 380, 32, 50, 3000, 8000 },
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{ 65536, 2048, 16, 4096, 7, 7, 6, 4, 170, 420, 48, 60, 2000, 5000 },
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{ 65536, 2048, 16, 4096, 8, 8, 7, 5, 180, 450, 64, 70, 1000, 2500 },
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{ 65536, 2048, 32, 8192, 9, 9, 8, 6, 190, 475, 64, 75, 500, 1200 },
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{ 65536, 2048, 32, 8192, 9, 9, 9, 6, 200, 500, 96, 80, 200, 500 }
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};
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/*
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* Code to determine how many different colors used in rectangle.
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*/
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static void tight_palette_rgb2buf(uint32_t rgb, int bpp, uint8_t buf[6])
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{
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memset(buf, 0, 6);
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if (bpp == 32) {
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buf[0] = ((rgb >> 24) & 0xFF);
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buf[1] = ((rgb >> 16) & 0xFF);
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buf[2] = ((rgb >> 8) & 0xFF);
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buf[3] = ((rgb >> 0) & 0xFF);
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buf[4] = ((buf[0] & 1) == 0) << 3 | ((buf[1] & 1) == 0) << 2;
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buf[4]|= ((buf[2] & 1) == 0) << 1 | ((buf[3] & 1) == 0) << 0;
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buf[0] |= 1;
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buf[1] |= 1;
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buf[2] |= 1;
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buf[3] |= 1;
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}
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if (bpp == 16) {
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buf[0] = ((rgb >> 8) & 0xFF);
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buf[1] = ((rgb >> 0) & 0xFF);
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buf[2] = ((buf[0] & 1) == 0) << 1 | ((buf[1] & 1) == 0) << 0;
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buf[0] |= 1;
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buf[1] |= 1;
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}
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}
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static uint32_t tight_palette_buf2rgb(int bpp, const uint8_t *buf)
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{
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uint32_t rgb = 0;
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if (bpp == 32) {
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rgb |= ((buf[0] & ~1) | !((buf[4] >> 3) & 1)) << 24;
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rgb |= ((buf[1] & ~1) | !((buf[4] >> 2) & 1)) << 16;
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rgb |= ((buf[2] & ~1) | !((buf[4] >> 1) & 1)) << 8;
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rgb |= ((buf[3] & ~1) | !((buf[4] >> 0) & 1)) << 0;
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}
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if (bpp == 16) {
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rgb |= ((buf[0] & ~1) | !((buf[2] >> 1) & 1)) << 8;
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rgb |= ((buf[1] & ~1) | !((buf[2] >> 0) & 1)) << 0;
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}
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return rgb;
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}
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static int tight_palette_insert(QDict *palette, uint32_t rgb, int bpp, int max)
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{
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uint8_t key[6];
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int idx = qdict_size(palette);
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bool present;
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tight_palette_rgb2buf(rgb, bpp, key);
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present = qdict_haskey(palette, (char *)key);
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if (idx >= max && !present) {
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return 0;
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}
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if (!present) {
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qdict_put(palette, (char *)key, qint_from_int(idx));
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}
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return qdict_size(palette);
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}
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#define DEFINE_FILL_PALETTE_FUNCTION(bpp) \
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\
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static int \
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tight_fill_palette##bpp(VncState *vs, int x, int y, \
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int max, size_t count, \
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uint32_t *bg, uint32_t *fg, \
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struct QDict **palette) { \
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uint##bpp##_t *data; \
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uint##bpp##_t c0, c1, ci; \
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int i, n0, n1; \
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\
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data = (uint##bpp##_t *)vs->tight.buffer; \
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\
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c0 = data[0]; \
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i = 1; \
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while (i < count && data[i] == c0) \
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i++; \
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if (i >= count) { \
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*bg = *fg = c0; \
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return 1; \
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} \
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\
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if (max < 2) { \
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return 0; \
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} \
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\
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n0 = i; \
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c1 = data[i]; \
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n1 = 0; \
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for (i++; i < count; i++) { \
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ci = data[i]; \
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if (ci == c0) { \
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n0++; \
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} else if (ci == c1) { \
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n1++; \
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} else \
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break; \
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} \
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if (i >= count) { \
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if (n0 > n1) { \
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*bg = (uint32_t)c0; \
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*fg = (uint32_t)c1; \
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} else { \
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*bg = (uint32_t)c1; \
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*fg = (uint32_t)c0; \
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} \
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return 2; \
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} \
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\
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if (max == 2) { \
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return 0; \
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} \
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\
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*palette = qdict_new(); \
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tight_palette_insert(*palette, c0, bpp, max); \
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tight_palette_insert(*palette, c1, bpp, max); \
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\
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for (i++; i < count; i++) { \
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if (data[i] == ci) { \
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continue; \
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} else { \
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if (!tight_palette_insert(*palette, (uint32_t)ci, \
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bpp, max)) { \
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return 0; \
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} \
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ci = data[i]; \
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} \
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} \
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\
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return qdict_size(*palette); \
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}
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DEFINE_FILL_PALETTE_FUNCTION(8)
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DEFINE_FILL_PALETTE_FUNCTION(16)
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DEFINE_FILL_PALETTE_FUNCTION(32)
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static int tight_fill_palette(VncState *vs, int x, int y,
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size_t count, uint32_t *bg, uint32_t *fg,
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struct QDict **palette)
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{
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int max;
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max = count / tight_conf[vs->tight_compression].idx_max_colors_divisor;
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if (max < 2 &&
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count >= tight_conf[vs->tight_compression].mono_min_rect_size) {
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max = 2;
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}
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if (max >= 256) {
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max = 256;
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}
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switch(vs->clientds.pf.bytes_per_pixel) {
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case 4:
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return tight_fill_palette32(vs, x, y, max, count, bg, fg, palette);
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case 2:
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return tight_fill_palette16(vs, x, y, max, count, bg, fg, palette);
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default:
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max = 2;
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return tight_fill_palette8(vs, x, y, max, count, bg, fg, palette);
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}
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return 0;
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}
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/* Callback to dump a palette with qdict_iter
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static void print_palette(const char *key, QObject *obj, void *opaque)
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{
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uint8_t idx = qint_get_int(qobject_to_qint(obj));
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uint32_t rgb = tight_palette_buf2rgb(32, (uint8_t *)key);
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fprintf(stderr, "%.2x ", (unsigned char)*key);
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while (*key++)
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fprintf(stderr, "%.2x ", (unsigned char)*key);
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fprintf(stderr, ": idx: %x rgb: %x\n", idx, rgb);
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}
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*/
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/*
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* Converting truecolor samples into palette indices.
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*/
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#define DEFINE_IDX_ENCODE_FUNCTION(bpp) \
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\
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static void \
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tight_encode_indexed_rect##bpp(uint8_t *buf, int count, \
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struct QDict *palette) { \
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uint##bpp##_t *src; \
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uint##bpp##_t rgb; \
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uint8_t key[6]; \
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int rep = 0; \
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uint8_t idx; \
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\
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src = (uint##bpp##_t *) buf; \
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\
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count -= 1; \
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while (count--) { \
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rgb = *src++; \
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rep = 0; \
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while (count && *src == rgb) { \
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rep++, src++, count--; \
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} \
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tight_palette_rgb2buf(rgb, bpp, key); \
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if (!qdict_haskey(palette, (char *)key)) { \
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/* \
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* Should never happen, but don't break everything \
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* if it does, use the first color instead \
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*/ \
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idx = 0; \
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} else { \
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idx = qdict_get_int(palette, (char *)key); \
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} \
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while (rep >= 0) { \
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*buf++ = idx; \
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rep--; \
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} \
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} \
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}
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DEFINE_IDX_ENCODE_FUNCTION(16)
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DEFINE_IDX_ENCODE_FUNCTION(32)
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#define DEFINE_MONO_ENCODE_FUNCTION(bpp) \
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\
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static void \
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tight_encode_mono_rect##bpp(uint8_t *buf, int w, int h, \
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uint##bpp##_t bg, uint##bpp##_t fg) { \
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uint##bpp##_t *ptr; \
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unsigned int value, mask; \
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int aligned_width; \
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int x, y, bg_bits; \
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\
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ptr = (uint##bpp##_t *) buf; \
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aligned_width = w - w % 8; \
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\
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for (y = 0; y < h; y++) { \
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for (x = 0; x < aligned_width; x += 8) { \
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for (bg_bits = 0; bg_bits < 8; bg_bits++) { \
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if (*ptr++ != bg) { \
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break; \
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} \
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} \
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if (bg_bits == 8) { \
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*buf++ = 0; \
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continue; \
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} \
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mask = 0x80 >> bg_bits; \
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value = mask; \
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for (bg_bits++; bg_bits < 8; bg_bits++) { \
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mask >>= 1; \
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if (*ptr++ != bg) { \
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value |= mask; \
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} \
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} \
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*buf++ = (uint8_t)value; \
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} \
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\
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mask = 0x80; \
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value = 0; \
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if (x >= w) { \
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continue; \
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} \
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\
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for (; x < w; x++) { \
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if (*ptr++ != bg) { \
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value |= mask; \
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} \
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mask >>= 1; \
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} \
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*buf++ = (uint8_t)value; \
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} \
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}
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DEFINE_MONO_ENCODE_FUNCTION(8)
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DEFINE_MONO_ENCODE_FUNCTION(16)
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DEFINE_MONO_ENCODE_FUNCTION(32)
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/*
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* Check if a rectangle is all of the same color. If needSameColor is
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* set to non-zero, then also check that its color equals to the
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* *colorPtr value. The result is 1 if the test is successfull, and in
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* that case new color will be stored in *colorPtr.
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*/
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#define DEFINE_CHECK_SOLID_FUNCTION(bpp) \
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\
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static bool \
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check_solid_tile##bpp(VncState *vs, int x, int y, int w, int h, \
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uint32_t* color, bool samecolor) \
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{ \
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VncDisplay *vd = vs->vd; \
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uint##bpp##_t *fbptr; \
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uint##bpp##_t c; \
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int dx, dy; \
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\
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fbptr = (uint##bpp##_t *) \
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(vd->server->data + y * ds_get_linesize(vs->ds) + \
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x * ds_get_bytes_per_pixel(vs->ds)); \
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\
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c = *fbptr; \
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if (samecolor && (uint32_t)c != *color) { \
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return false; \
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} \
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\
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for (dy = 0; dy < h; dy++) { \
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for (dx = 0; dx < w; dx++) { \
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if (c != fbptr[dx]) { \
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return false; \
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} \
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} \
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fbptr = (uint##bpp##_t *) \
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((uint8_t *)fbptr + ds_get_linesize(vs->ds)); \
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} \
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\
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*color = (uint32_t)c; \
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return true; \
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}
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DEFINE_CHECK_SOLID_FUNCTION(32)
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DEFINE_CHECK_SOLID_FUNCTION(16)
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DEFINE_CHECK_SOLID_FUNCTION(8)
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static bool check_solid_tile(VncState *vs, int x, int y, int w, int h,
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uint32_t* color, bool samecolor)
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{
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VncDisplay *vd = vs->vd;
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switch(vd->server->pf.bytes_per_pixel) {
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case 4:
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return check_solid_tile32(vs, x, y, w, h, color, samecolor);
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case 2:
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return check_solid_tile16(vs, x, y, w, h, color, samecolor);
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default:
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return check_solid_tile8(vs, x, y, w, h, color, samecolor);
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}
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}
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static void find_best_solid_area(VncState *vs, int x, int y, int w, int h,
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uint32_t color, int *w_ptr, int *h_ptr)
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{
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int dx, dy, dw, dh;
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int w_prev;
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int w_best = 0, h_best = 0;
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w_prev = w;
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for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
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dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy);
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dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev);
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if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) {
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break;
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}
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for (dx = x + dw; dx < x + w_prev;) {
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dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx);
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if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) {
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break;
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}
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dx += dw;
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}
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w_prev = dx - x;
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if (w_prev * (dy + dh - y) > w_best * h_best) {
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w_best = w_prev;
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h_best = dy + dh - y;
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}
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}
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*w_ptr = w_best;
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*h_ptr = h_best;
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}
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static void extend_solid_area(VncState *vs, int x, int y, int w, int h,
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uint32_t color, int *x_ptr, int *y_ptr,
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int *w_ptr, int *h_ptr)
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{
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int cx, cy;
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/* Try to extend the area upwards. */
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for ( cy = *y_ptr - 1;
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cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
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cy-- );
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*h_ptr += *y_ptr - (cy + 1);
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*y_ptr = cy + 1;
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/* ... downwards. */
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for ( cy = *y_ptr + *h_ptr;
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cy < y + h &&
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check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
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cy++ );
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*h_ptr += cy - (*y_ptr + *h_ptr);
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/* ... to the left. */
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for ( cx = *x_ptr - 1;
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cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
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cx-- );
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*w_ptr += *x_ptr - (cx + 1);
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*x_ptr = cx + 1;
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/* ... to the right. */
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for ( cx = *x_ptr + *w_ptr;
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cx < x + w &&
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check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
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cx++ );
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*w_ptr += cx - (*x_ptr + *w_ptr);
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}
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|
|
|
static int tight_init_stream(VncState *vs, int stream_id,
|
|
int level, int strategy)
|
|
{
|
|
z_streamp zstream = &vs->tight_stream[stream_id];
|
|
|
|
if (zstream->opaque == NULL) {
|
|
int err;
|
|
|
|
VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id);
|
|
VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs);
|
|
zstream->zalloc = vnc_zlib_zalloc;
|
|
zstream->zfree = vnc_zlib_zfree;
|
|
|
|
err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS,
|
|
MAX_MEM_LEVEL, strategy);
|
|
|
|
if (err != Z_OK) {
|
|
fprintf(stderr, "VNC: error initializing zlib\n");
|
|
return -1;
|
|
}
|
|
|
|
vs->tight_levels[stream_id] = level;
|
|
zstream->opaque = vs;
|
|
}
|
|
|
|
if (vs->tight_levels[stream_id] != level) {
|
|
if (deflateParams(zstream, level, strategy) != Z_OK) {
|
|
return -1;
|
|
}
|
|
vs->tight_levels[stream_id] = level;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void tight_send_compact_size(VncState *vs, size_t len)
|
|
{
|
|
int lpc = 0;
|
|
int bytes = 0;
|
|
char buf[3] = {0, 0, 0};
|
|
|
|
buf[bytes++] = len & 0x7F;
|
|
if (len > 0x7F) {
|
|
buf[bytes-1] |= 0x80;
|
|
buf[bytes++] = (len >> 7) & 0x7F;
|
|
if (len > 0x3FFF) {
|
|
buf[bytes-1] |= 0x80;
|
|
buf[bytes++] = (len >> 14) & 0xFF;
|
|
}
|
|
}
|
|
for (lpc = 0; lpc < bytes; lpc++) {
|
|
vnc_write_u8(vs, buf[lpc]);
|
|
}
|
|
}
|
|
|
|
static int tight_compress_data(VncState *vs, int stream_id, size_t bytes,
|
|
int level, int strategy)
|
|
{
|
|
z_streamp zstream = &vs->tight_stream[stream_id];
|
|
int previous_out;
|
|
|
|
if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) {
|
|
vnc_write(vs, vs->tight.buffer, vs->tight.offset);
|
|
return bytes;
|
|
}
|
|
|
|
if (tight_init_stream(vs, stream_id, level, strategy)) {
|
|
return -1;
|
|
}
|
|
|
|
/* reserve memory in output buffer */
|
|
buffer_reserve(&vs->tight_zlib, bytes + 64);
|
|
|
|
/* set pointers */
|
|
zstream->next_in = vs->tight.buffer;
|
|
zstream->avail_in = vs->tight.offset;
|
|
zstream->next_out = vs->tight_zlib.buffer + vs->tight_zlib.offset;
|
|
zstream->avail_out = vs->tight_zlib.capacity - vs->tight_zlib.offset;
|
|
zstream->data_type = Z_BINARY;
|
|
previous_out = zstream->total_out;
|
|
|
|
/* start encoding */
|
|
if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) {
|
|
fprintf(stderr, "VNC: error during tight compression\n");
|
|
return -1;
|
|
}
|
|
|
|
vs->tight_zlib.offset = vs->tight_zlib.capacity - zstream->avail_out;
|
|
bytes = zstream->total_out - previous_out;
|
|
|
|
tight_send_compact_size(vs, bytes);
|
|
vnc_write(vs, vs->tight_zlib.buffer, bytes);
|
|
|
|
buffer_reset(&vs->tight_zlib);
|
|
|
|
return bytes;
|
|
}
|
|
|
|
/*
|
|
* Subencoding implementations.
|
|
*/
|
|
static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret)
|
|
{
|
|
uint32_t *buf32;
|
|
uint32_t pix;
|
|
int rshift, gshift, bshift;
|
|
|
|
buf32 = (uint32_t *)buf;
|
|
|
|
if ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) ==
|
|
(vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)) {
|
|
rshift = vs->clientds.pf.rshift;
|
|
gshift = vs->clientds.pf.gshift;
|
|
bshift = vs->clientds.pf.bshift;
|
|
} else {
|
|
rshift = 24 - vs->clientds.pf.rshift;
|
|
gshift = 24 - vs->clientds.pf.gshift;
|
|
bshift = 24 - vs->clientds.pf.bshift;
|
|
}
|
|
|
|
if (ret) {
|
|
*ret = count * 3;
|
|
}
|
|
|
|
while (count--) {
|
|
pix = *buf32++;
|
|
*buf++ = (char)(pix >> rshift);
|
|
*buf++ = (char)(pix >> gshift);
|
|
*buf++ = (char)(pix >> bshift);
|
|
}
|
|
}
|
|
|
|
static int send_full_color_rect(VncState *vs, int w, int h)
|
|
{
|
|
int stream = 0;
|
|
size_t bytes;
|
|
|
|
vnc_write_u8(vs, stream << 4); /* no flushing, no filter */
|
|
|
|
if (vs->tight_pixel24) {
|
|
tight_pack24(vs, vs->tight.buffer, w * h, &vs->tight.offset);
|
|
bytes = 3;
|
|
} else {
|
|
bytes = vs->clientds.pf.bytes_per_pixel;
|
|
}
|
|
|
|
bytes = tight_compress_data(vs, stream, w * h * bytes,
|
|
tight_conf[vs->tight_compression].raw_zlib_level,
|
|
Z_DEFAULT_STRATEGY);
|
|
|
|
return (bytes >= 0);
|
|
}
|
|
|
|
static int send_solid_rect(VncState *vs)
|
|
{
|
|
size_t bytes;
|
|
|
|
vnc_write_u8(vs, VNC_TIGHT_FILL << 4); /* no flushing, no filter */
|
|
|
|
if (vs->tight_pixel24) {
|
|
tight_pack24(vs, vs->tight.buffer, 1, &vs->tight.offset);
|
|
bytes = 3;
|
|
} else {
|
|
bytes = vs->clientds.pf.bytes_per_pixel;
|
|
}
|
|
|
|
vnc_write(vs, vs->tight.buffer, bytes);
|
|
return 1;
|
|
}
|
|
|
|
static int send_mono_rect(VncState *vs, int w, int h, uint32_t bg, uint32_t fg)
|
|
{
|
|
size_t bytes;
|
|
int stream = 1;
|
|
int level = tight_conf[vs->tight_compression].mono_zlib_level;
|
|
|
|
bytes = ((w + 7) / 8) * h;
|
|
|
|
vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
|
|
vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE);
|
|
vnc_write_u8(vs, 1);
|
|
|
|
switch(vs->clientds.pf.bytes_per_pixel) {
|
|
case 4:
|
|
{
|
|
uint32_t buf[2] = {bg, fg};
|
|
size_t ret = sizeof (buf);
|
|
|
|
if (vs->tight_pixel24) {
|
|
tight_pack24(vs, (unsigned char*)buf, 2, &ret);
|
|
}
|
|
vnc_write(vs, buf, ret);
|
|
|
|
tight_encode_mono_rect32(vs->tight.buffer, w, h, bg, fg);
|
|
break;
|
|
}
|
|
case 2:
|
|
vnc_write(vs, &bg, 2);
|
|
vnc_write(vs, &fg, 2);
|
|
tight_encode_mono_rect16(vs->tight.buffer, w, h, bg, fg);
|
|
break;
|
|
default:
|
|
vnc_write_u8(vs, bg);
|
|
vnc_write_u8(vs, fg);
|
|
tight_encode_mono_rect8(vs->tight.buffer, w, h, bg, fg);
|
|
break;
|
|
}
|
|
vs->tight.offset = bytes;
|
|
|
|
bytes = tight_compress_data(vs, stream, bytes, level, Z_DEFAULT_STRATEGY);
|
|
return (bytes >= 0);
|
|
}
|
|
|
|
struct palette_cb_priv {
|
|
VncState *vs;
|
|
uint8_t *header;
|
|
};
|
|
|
|
static void write_palette(const char *key, QObject *obj, void *opaque)
|
|
{
|
|
struct palette_cb_priv *priv = opaque;
|
|
VncState *vs = priv->vs;
|
|
uint32_t bytes = vs->clientds.pf.bytes_per_pixel;
|
|
uint8_t idx = qint_get_int(qobject_to_qint(obj));
|
|
|
|
if (bytes == 4) {
|
|
uint32_t color = tight_palette_buf2rgb(32, (uint8_t *)key);
|
|
|
|
((uint32_t*)priv->header)[idx] = color;
|
|
} else {
|
|
uint16_t color = tight_palette_buf2rgb(16, (uint8_t *)key);
|
|
|
|
((uint16_t*)priv->header)[idx] = color;
|
|
}
|
|
}
|
|
|
|
static int send_palette_rect(VncState *vs, int w, int h, struct QDict *palette)
|
|
{
|
|
int stream = 2;
|
|
int level = tight_conf[vs->tight_compression].idx_zlib_level;
|
|
int colors;
|
|
size_t bytes;
|
|
|
|
colors = qdict_size(palette);
|
|
|
|
vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
|
|
vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE);
|
|
vnc_write_u8(vs, colors - 1);
|
|
|
|
switch(vs->clientds.pf.bytes_per_pixel) {
|
|
case 4:
|
|
{
|
|
size_t old_offset, offset;
|
|
uint32_t header[qdict_size(palette)];
|
|
struct palette_cb_priv priv = { vs, (uint8_t *)header };
|
|
|
|
old_offset = vs->output.offset;
|
|
qdict_iter(palette, write_palette, &priv);
|
|
vnc_write(vs, header, sizeof(header));
|
|
|
|
if (vs->tight_pixel24) {
|
|
tight_pack24(vs, vs->output.buffer + old_offset, colors, &offset);
|
|
vs->output.offset = old_offset + offset;
|
|
}
|
|
|
|
tight_encode_indexed_rect32(vs->tight.buffer, w * h, palette);
|
|
break;
|
|
}
|
|
case 2:
|
|
{
|
|
uint16_t header[qdict_size(palette)];
|
|
struct palette_cb_priv priv = { vs, (uint8_t *)header };
|
|
|
|
qdict_iter(palette, write_palette, &priv);
|
|
vnc_write(vs, header, sizeof(header));
|
|
tight_encode_indexed_rect16(vs->tight.buffer, w * h, palette);
|
|
break;
|
|
}
|
|
default:
|
|
return -1; /* No palette for 8bits colors */
|
|
break;
|
|
}
|
|
bytes = w * h;
|
|
vs->tight.offset = bytes;
|
|
|
|
bytes = tight_compress_data(vs, stream, bytes,
|
|
level, Z_DEFAULT_STRATEGY);
|
|
return (bytes >= 0);
|
|
}
|
|
|
|
static void vnc_tight_start(VncState *vs)
|
|
{
|
|
buffer_reset(&vs->tight);
|
|
|
|
// make the output buffer be the zlib buffer, so we can compress it later
|
|
vs->tight_tmp = vs->output;
|
|
vs->output = vs->tight;
|
|
}
|
|
|
|
static void vnc_tight_stop(VncState *vs)
|
|
{
|
|
// switch back to normal output/zlib buffers
|
|
vs->tight = vs->output;
|
|
vs->output = vs->tight_tmp;
|
|
}
|
|
|
|
static int send_sub_rect(VncState *vs, int x, int y, int w, int h)
|
|
{
|
|
struct QDict *palette = NULL;
|
|
uint32_t bg = 0, fg = 0;
|
|
int colors;
|
|
int ret = 0;
|
|
|
|
vnc_framebuffer_update(vs, x, y, w, h, VNC_ENCODING_TIGHT);
|
|
|
|
vnc_tight_start(vs);
|
|
vnc_raw_send_framebuffer_update(vs, x, y, w, h);
|
|
vnc_tight_stop(vs);
|
|
|
|
colors = tight_fill_palette(vs, x, y, w * h, &fg, &bg, &palette);
|
|
|
|
if (colors == 0) {
|
|
ret = send_full_color_rect(vs, w, h);
|
|
} else if (colors == 1) {
|
|
ret = send_solid_rect(vs);
|
|
} else if (colors == 2) {
|
|
ret = send_mono_rect(vs, w, h, bg, fg);
|
|
} else if (colors <= 256) {
|
|
ret = send_palette_rect(vs, w, h, palette);
|
|
}
|
|
QDECREF(palette);
|
|
return ret;
|
|
}
|
|
|
|
static int send_sub_rect_solid(VncState *vs, int x, int y, int w, int h)
|
|
{
|
|
vnc_framebuffer_update(vs, x, y, w, h, VNC_ENCODING_TIGHT);
|
|
|
|
vnc_tight_start(vs);
|
|
vnc_raw_send_framebuffer_update(vs, x, y, w, h);
|
|
vnc_tight_stop(vs);
|
|
|
|
return send_solid_rect(vs);
|
|
}
|
|
|
|
static int send_rect_simple(VncState *vs, int x, int y, int w, int h)
|
|
{
|
|
int max_size, max_width;
|
|
int max_sub_width, max_sub_height;
|
|
int dx, dy;
|
|
int rw, rh;
|
|
int n = 0;
|
|
|
|
max_size = tight_conf[vs->tight_compression].max_rect_size;
|
|
max_width = tight_conf[vs->tight_compression].max_rect_width;
|
|
|
|
if (w > max_width || w * h > max_size) {
|
|
max_sub_width = (w > max_width) ? max_width : w;
|
|
max_sub_height = max_size / max_sub_width;
|
|
|
|
for (dy = 0; dy < h; dy += max_sub_height) {
|
|
for (dx = 0; dx < w; dx += max_width) {
|
|
rw = MIN(max_sub_width, w - dx);
|
|
rh = MIN(max_sub_height, h - dy);
|
|
n += send_sub_rect(vs, x+dx, y+dy, rw, rh);
|
|
}
|
|
}
|
|
} else {
|
|
n += send_sub_rect(vs, x, y, w, h);
|
|
}
|
|
|
|
return n;
|
|
}
|
|
|
|
static int find_large_solid_color_rect(VncState *vs, int x, int y,
|
|
int w, int h, int max_rows)
|
|
{
|
|
int dx, dy, dw, dh;
|
|
int n = 0;
|
|
|
|
/* Try to find large solid-color areas and send them separately. */
|
|
|
|
for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
|
|
|
|
/* If a rectangle becomes too large, send its upper part now. */
|
|
|
|
if (dy - y >= max_rows) {
|
|
n += send_rect_simple(vs, x, y, w, max_rows);
|
|
y += max_rows;
|
|
h -= max_rows;
|
|
}
|
|
|
|
dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (y + h - dy));
|
|
|
|
for (dx = x; dx < x + w; dx += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
|
|
uint32_t color_value;
|
|
int x_best, y_best, w_best, h_best;
|
|
|
|
dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (x + w - dx));
|
|
|
|
if (!check_solid_tile(vs, dx, dy, dw, dh, &color_value, false)) {
|
|
continue ;
|
|
}
|
|
|
|
/* Get dimensions of solid-color area. */
|
|
|
|
find_best_solid_area(vs, dx, dy, w - (dx - x), h - (dy - y),
|
|
color_value, &w_best, &h_best);
|
|
|
|
/* Make sure a solid rectangle is large enough
|
|
(or the whole rectangle is of the same color). */
|
|
|
|
if (w_best * h_best != w * h &&
|
|
w_best * h_best < VNC_TIGHT_MIN_SOLID_SUBRECT_SIZE) {
|
|
continue;
|
|
}
|
|
|
|
/* Try to extend solid rectangle to maximum size. */
|
|
|
|
x_best = dx; y_best = dy;
|
|
extend_solid_area(vs, x, y, w, h, color_value,
|
|
&x_best, &y_best, &w_best, &h_best);
|
|
|
|
/* Send rectangles at top and left to solid-color area. */
|
|
|
|
if (y_best != y) {
|
|
n += send_rect_simple(vs, x, y, w, y_best-y);
|
|
}
|
|
if (x_best != x) {
|
|
n += vnc_tight_send_framebuffer_update(vs, x, y_best,
|
|
x_best-x, h_best);
|
|
}
|
|
|
|
/* Send solid-color rectangle. */
|
|
n += send_sub_rect_solid(vs, x_best, y_best, w_best, h_best);
|
|
|
|
/* Send remaining rectangles (at right and bottom). */
|
|
|
|
if (x_best + w_best != x + w) {
|
|
n += vnc_tight_send_framebuffer_update(vs, x_best+w_best,
|
|
y_best,
|
|
w-(x_best-x)-w_best,
|
|
h_best);
|
|
}
|
|
if (y_best + h_best != y + h) {
|
|
n += vnc_tight_send_framebuffer_update(vs, x, y_best+h_best,
|
|
w, h-(y_best-y)-h_best);
|
|
}
|
|
|
|
/* Return after all recursive calls are done. */
|
|
return n;
|
|
}
|
|
}
|
|
return n + send_rect_simple(vs, x, y, w, h);
|
|
}
|
|
|
|
int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y,
|
|
int w, int h)
|
|
{
|
|
int max_rows;
|
|
|
|
if (vs->clientds.pf.bytes_per_pixel == 4 && vs->clientds.pf.rmax == 0xFF &&
|
|
vs->clientds.pf.bmax == 0xFF && vs->clientds.pf.gmax == 0xFF) {
|
|
vs->tight_pixel24 = true;
|
|
} else {
|
|
vs->tight_pixel24 = false;
|
|
}
|
|
|
|
if (w * h < VNC_TIGHT_MIN_SPLIT_RECT_SIZE)
|
|
return send_rect_simple(vs, x, y, w, h);
|
|
|
|
/* Calculate maximum number of rows in one non-solid rectangle. */
|
|
|
|
max_rows = tight_conf[vs->tight_compression].max_rect_size;
|
|
max_rows /= MIN(tight_conf[vs->tight_compression].max_rect_width, w);
|
|
|
|
return find_large_solid_color_rect(vs, x, y, w, h, max_rows);
|
|
}
|
|
|
|
void vnc_tight_clear(VncState *vs)
|
|
{
|
|
int i;
|
|
for (i=0; i<ARRAY_SIZE(vs->tight_stream); i++) {
|
|
if (vs->tight_stream[i].opaque) {
|
|
deflateEnd(&vs->tight_stream[i]);
|
|
}
|
|
}
|
|
|
|
buffer_free(&vs->tight);
|
|
buffer_free(&vs->tight_zlib);
|
|
}
|