root / vnc-encoding-tight.c @ 380282b0
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/*
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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 "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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static int tight_init_stream(VncState *vs, int stream_id, |
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int level, int strategy) |
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{ |
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z_streamp zstream = &vs->tight_stream[stream_id]; |
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if (zstream->opaque == NULL) { |
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int err;
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VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id);
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VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs);
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zstream->zalloc = vnc_zlib_zalloc; |
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zstream->zfree = vnc_zlib_zfree; |
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err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS, |
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MAX_MEM_LEVEL, strategy); |
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if (err != Z_OK) {
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fprintf(stderr, "VNC: error initializing zlib\n");
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return -1; |
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} |
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vs->tight_levels[stream_id] = level; |
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zstream->opaque = vs; |
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} |
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if (vs->tight_levels[stream_id] != level) {
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if (deflateParams(zstream, level, strategy) != Z_OK) {
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return -1; |
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} |
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vs->tight_levels[stream_id] = level; |
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} |
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return 0; |
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} |
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static void tight_send_compact_size(VncState *vs, size_t len) |
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{ |
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int lpc = 0; |
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int bytes = 0; |
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char buf[3] = {0, 0, 0}; |
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buf[bytes++] = len & 0x7F;
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if (len > 0x7F) { |
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buf[bytes-1] |= 0x80; |
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buf[bytes++] = (len >> 7) & 0x7F; |
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if (len > 0x3FFF) { |
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buf[bytes-1] |= 0x80; |
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buf[bytes++] = (len >> 14) & 0xFF; |
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} |
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} |
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for(lpc = 0; lpc < bytes; lpc++) { |
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vnc_write_u8(vs, buf[lpc]); |
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} |
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} |
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static int tight_compress_data(VncState *vs, int stream_id, size_t bytes, |
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int level, int strategy) |
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{ |
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z_streamp zstream = &vs->tight_stream[stream_id]; |
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int previous_out;
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if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) {
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vnc_write(vs, vs->tight.buffer, vs->tight.offset); |
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return bytes;
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} |
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if (tight_init_stream(vs, stream_id, level, strategy)) {
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return -1; |
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} |
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/* reserve memory in output buffer */
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buffer_reserve(&vs->tight_zlib, bytes + 64);
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/* set pointers */
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zstream->next_in = vs->tight.buffer; |
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zstream->avail_in = vs->tight.offset; |
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zstream->next_out = vs->tight_zlib.buffer + vs->tight_zlib.offset; |
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zstream->avail_out = vs->tight_zlib.capacity - vs->tight_zlib.offset; |
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zstream->data_type = Z_BINARY; |
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previous_out = zstream->total_out; |
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/* start encoding */
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if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) {
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fprintf(stderr, "VNC: error during tight compression\n");
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return -1; |
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} |
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vs->tight_zlib.offset = vs->tight_zlib.capacity - zstream->avail_out; |
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bytes = zstream->total_out - previous_out; |
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tight_send_compact_size(vs, bytes); |
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vnc_write(vs, vs->tight_zlib.buffer, bytes); |
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buffer_reset(&vs->tight_zlib); |
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return bytes;
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} |
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/*
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* Subencoding implementations.
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*/
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static void tight_pack24(VncState *vs, size_t count) |
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{ |
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unsigned char *buf; |
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uint32_t *buf32; |
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uint32_t pix; |
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int rshift, gshift, bshift;
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buf = vs->tight.buffer; |
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buf32 = (uint32_t *)buf; |
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if ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) ==
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(vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)) { |
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rshift = vs->clientds.pf.rshift; |
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gshift = vs->clientds.pf.gshift; |
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bshift = vs->clientds.pf.bshift; |
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} else {
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rshift = 24 - vs->clientds.pf.rshift;
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gshift = 24 - vs->clientds.pf.gshift;
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bshift = 24 - vs->clientds.pf.bshift;
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} |
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vs->tight.offset = count * 3;
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while (count--) {
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pix = *buf32++; |
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*buf++ = (char)(pix >> rshift);
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*buf++ = (char)(pix >> gshift);
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*buf++ = (char)(pix >> bshift);
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} |
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} |
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static int send_full_color_rect(VncState *vs, int w, int h) |
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{ |
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int stream = 0; |
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size_t bytes; |
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vnc_write_u8(vs, stream << 4); /* no flushing, no filter */ |
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if (vs->tight_pixel24) {
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tight_pack24(vs, w * h); |
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bytes = 3;
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} else {
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bytes = vs->clientds.pf.bytes_per_pixel; |
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} |
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bytes = tight_compress_data(vs, stream, w * h * bytes, |
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tight_conf[vs->tight_compression].raw_zlib_level, |
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Z_DEFAULT_STRATEGY); |
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return (bytes >= 0); |
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} |
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static void vnc_tight_start(VncState *vs) |
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{ |
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buffer_reset(&vs->tight); |
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// make the output buffer be the zlib buffer, so we can compress it later
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vs->tight_tmp = vs->output; |
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vs->output = vs->tight; |
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} |
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static void vnc_tight_stop(VncState *vs) |
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{ |
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// switch back to normal output/zlib buffers
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vs->tight = vs->output; |
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vs->output = vs->tight_tmp; |
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} |
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static int send_sub_rect(VncState *vs, int x, int y, int w, int h) |
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{ |
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vnc_framebuffer_update(vs, x, y, w, h, VNC_ENCODING_TIGHT); |
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/*
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* Convert pixels and store them in vs->tight
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* We will probably rework that later, probably
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* when adding other sub-encodings
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*/
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vnc_tight_start(vs); |
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vnc_raw_send_framebuffer_update(vs, x, y, w, h); |
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vnc_tight_stop(vs); |
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return send_full_color_rect(vs, w, h);
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} |
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static int send_rect_simple(VncState *vs, int x, int y, int w, int h) |
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{ |
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int max_size, max_width;
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int max_sub_width, max_sub_height;
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int dx, dy;
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int rw, rh;
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int n = 0; |
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max_size = tight_conf[vs->tight_compression].max_rect_size; |
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max_width = tight_conf[vs->tight_compression].max_rect_width; |
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if (w > max_width || w * h > max_size) {
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max_sub_width = (w > max_width) ? max_width : w; |
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max_sub_height = max_size / max_sub_width; |
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for (dy = 0; dy < h; dy += max_sub_height) { |
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for (dx = 0; dx < w; dx += max_width) { |
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rw = MIN(max_sub_width, w - dx); |
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rh = MIN(max_sub_height, h - dy); |
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n += send_sub_rect(vs, x+dx, y+dy, rw, rh); |
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} |
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} |
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} else {
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n += send_sub_rect(vs, x, y, w, h); |
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} |
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return n;
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} |
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int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, |
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int w, int h) |
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{ |
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if (vs->clientds.pf.bytes_per_pixel == 4 && vs->clientds.pf.rmax == 0xFF && |
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vs->clientds.pf.bmax == 0xFF && vs->clientds.pf.gmax == 0xFF) { |
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vs->tight_pixel24 = true;
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} else {
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vs->tight_pixel24 = false;
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} |
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return send_rect_simple(vs, x, y, w, h);
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} |
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void vnc_tight_clear(VncState *vs)
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{ |
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int i;
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for (i=0; i<ARRAY_SIZE(vs->tight_stream); i++) { |
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if (vs->tight_stream[i].opaque) {
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deflateEnd(&vs->tight_stream[i]); |
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} |
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} |
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buffer_free(&vs->tight); |
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buffer_free(&vs->tight_zlib); |
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} |