--- /dev/null
+/*
+ * QEMU VNC display driver: Zlib Run-length Encoding (ZRLE)
+ *
+ * From libvncserver/libvncserver/zrleencodetemplate.c
+ * Copyright (C) 2002 RealVNC Ltd. All Rights Reserved.
+ * Copyright (C) 2003 Sun Microsystems, Inc.
+ *
+ * Copyright (C) 2010 Corentin Chary <corentin.chary@gmail.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+/*
+ * Before including this file, you must define a number of CPP macros.
+ *
+ * ZRLE_BPP should be 8, 16 or 32 depending on the bits per pixel.
+ *
+ * Note that the buf argument to ZRLE_ENCODE needs to be at least one pixel
+ * bigger than the largest tile of pixel data, since the ZRLE encoding
+ * algorithm writes to the position one past the end of the pixel data.
+ */
+
+
+#include <assert.h>
+
+#undef ZRLE_ENDIAN_SUFFIX
+
+#if ZYWRLE_ENDIAN == ENDIAN_LITTLE
+#define ZRLE_ENDIAN_SUFFIX le
+#elif ZYWRLE_ENDIAN == ENDIAN_BIG
+#define ZRLE_ENDIAN_SUFFIX be
+#else
+#define ZRLE_ENDIAN_SUFFIX ne
+#endif
+
+#ifndef ZRLE_CONCAT
+#define ZRLE_CONCAT_I(a, b) a##b
+#define ZRLE_CONCAT2(a, b) ZRLE_CONCAT_I(a, b)
+#define ZRLE_CONCAT3(a, b, c) ZRLE_CONCAT2(a, ZRLE_CONCAT2(b, c))
+#endif
+
+#ifdef ZRLE_COMPACT_PIXEL
+#define ZRLE_ENCODE_SUFFIX ZRLE_CONCAT2(ZRLE_COMPACT_PIXEL,ZRLE_ENDIAN_SUFFIX)
+#define ZRLE_WRITE_SUFFIX ZRLE_COMPACT_PIXEL
+#define ZRLE_PIXEL ZRLE_CONCAT3(uint,ZRLE_BPP,_t)
+#define ZRLE_BPP_OUT 24
+#elif ZRLE_BPP == 15
+#define ZRLE_ENCODE_SUFFIX ZRLE_CONCAT2(ZRLE_BPP,ZRLE_ENDIAN_SUFFIX)
+#define ZRLE_WRITE_SUFFIX 16
+#define ZRLE_PIXEL uint16_t
+#define ZRLE_BPP_OUT 16
+#else
+#define ZRLE_ENCODE_SUFFIX ZRLE_CONCAT2(ZRLE_BPP,ZRLE_ENDIAN_SUFFIX)
+#define ZRLE_WRITE_SUFFIX ZRLE_BPP
+#define ZRLE_BPP_OUT ZRLE_BPP
+#define ZRLE_PIXEL ZRLE_CONCAT3(uint,ZRLE_BPP,_t)
+#endif
+
+#define ZRLE_WRITE_PIXEL ZRLE_CONCAT2(zrle_write_u, ZRLE_WRITE_SUFFIX)
+#define ZRLE_ENCODE ZRLE_CONCAT2(zrle_encode_, ZRLE_ENCODE_SUFFIX)
+#define ZRLE_ENCODE_TILE ZRLE_CONCAT2(zrle_encode_tile, ZRLE_ENCODE_SUFFIX)
+#define ZRLE_WRITE_PALETTE ZRLE_CONCAT2(zrle_write_palette,ZRLE_ENCODE_SUFFIX)
+
+static void ZRLE_ENCODE_TILE(VncState *vs, ZRLE_PIXEL *data, int w, int h,
+ int zywrle_level);
+
+#if ZRLE_BPP != 8
+#include "vnc-enc-zywrle-template.c"
+#endif
+
+
+static void ZRLE_ENCODE(VncState *vs, int x, int y, int w, int h,
+ int zywrle_level)
+{
+ int ty;
+
+ for (ty = y; ty < y + h; ty += VNC_ZRLE_TILE_HEIGHT) {
+
+ int tx, th;
+
+ th = MIN(VNC_ZRLE_TILE_HEIGHT, y + h - ty);
+
+ for (tx = x; tx < x + w; tx += VNC_ZRLE_TILE_WIDTH) {
+ int tw;
+ ZRLE_PIXEL *buf;
+
+ tw = MIN(VNC_ZRLE_TILE_WIDTH, x + w - tx);
+
+ buf = zrle_convert_fb(vs, tx, ty, tw, th, ZRLE_BPP);
+ ZRLE_ENCODE_TILE(vs, buf, tw, th, zywrle_level);
+ }
+ }
+}
+
+static void ZRLE_ENCODE_TILE(VncState *vs, ZRLE_PIXEL *data, int w, int h,
+ int zywrle_level)
+{
+ VncPalette *palette = &vs->zrle.palette;
+
+ int runs = 0;
+ int single_pixels = 0;
+
+ bool use_rle;
+ bool use_palette;
+
+ int i;
+
+ ZRLE_PIXEL *ptr = data;
+ ZRLE_PIXEL *end = ptr + h * w;
+ *end = ~*(end-1); /* one past the end is different so the while loop ends */
+
+ /* Real limit is 127 but we wan't a way to know if there is more than 127 */
+ palette_init(palette, 256, ZRLE_BPP);
+
+ while (ptr < end) {
+ ZRLE_PIXEL pix = *ptr;
+ if (*++ptr != pix) { /* FIXME */
+ single_pixels++;
+ } else {
+ while (*++ptr == pix) ;
+ runs++;
+ }
+ palette_put(palette, pix);
+ }
+
+ /* Solid tile is a special case */
+
+ if (palette_size(palette) == 1) {
+ bool found;
+
+ vnc_write_u8(vs, 1);
+ ZRLE_WRITE_PIXEL(vs, palette_color(palette, 0, &found));
+ return;
+ }
+
+ zrle_choose_palette_rle(vs, w, h, palette, ZRLE_BPP_OUT,
+ runs, single_pixels, zywrle_level,
+ &use_rle, &use_palette);
+
+ if (!use_palette) {
+ vnc_write_u8(vs, (use_rle ? 128 : 0));
+ } else {
+ uint32_t colors[VNC_PALETTE_MAX_SIZE];
+ size_t size = palette_size(palette);
+
+ vnc_write_u8(vs, (use_rle ? 128 : 0) | size);
+ palette_fill(palette, colors);
+
+ for (i = 0; i < size; i++) {
+ ZRLE_WRITE_PIXEL(vs, colors[i]);
+ }
+ }
+
+ if (use_rle) {
+ ZRLE_PIXEL *ptr = data;
+ ZRLE_PIXEL *end = ptr + w * h;
+ ZRLE_PIXEL *run_start;
+ ZRLE_PIXEL pix;
+
+ while (ptr < end) {
+ int len;
+ int index = 0;
+
+ run_start = ptr;
+ pix = *ptr++;
+
+ while (*ptr == pix && ptr < end) {
+ ptr++;
+ }
+
+ len = ptr - run_start;
+
+ if (use_palette)
+ index = palette_idx(palette, pix);
+
+ if (len <= 2 && use_palette) {
+ if (len == 2) {
+ vnc_write_u8(vs, index);
+ }
+ vnc_write_u8(vs, index);
+ continue;
+ }
+ if (use_palette) {
+ vnc_write_u8(vs, index | 128);
+ } else {
+ ZRLE_WRITE_PIXEL(vs, pix);
+ }
+
+ len -= 1;
+
+ while (len >= 255) {
+ vnc_write_u8(vs, 255);
+ len -= 255;
+ }
+
+ vnc_write_u8(vs, len);
+ }
+ } else if (use_palette) { /* no RLE */
+ int bppp;
+ ZRLE_PIXEL *ptr = data;
+
+ /* packed pixels */
+
+ assert (palette_size(palette) < 17);
+
+ bppp = bits_per_packed_pixel[palette_size(palette)-1];
+
+ for (i = 0; i < h; i++) {
+ uint8_t nbits = 0;
+ uint8_t byte = 0;
+
+ ZRLE_PIXEL *eol = ptr + w;
+
+ while (ptr < eol) {
+ ZRLE_PIXEL pix = *ptr++;
+ uint8_t index = palette_idx(palette, pix);
+
+ byte = (byte << bppp) | index;
+ nbits += bppp;
+ if (nbits >= 8) {
+ vnc_write_u8(vs, byte);
+ nbits = 0;
+ }
+ }
+ if (nbits > 0) {
+ byte <<= 8 - nbits;
+ vnc_write_u8(vs, byte);
+ }
+ }
+ } else {
+
+ /* raw */
+
+#if ZRLE_BPP != 8
+ if (zywrle_level > 0 && !(zywrle_level & 0x80)) {
+ ZYWRLE_ANALYZE(data, data, w, h, w, zywrle_level, vs->zywrle.buf);
+ ZRLE_ENCODE_TILE(vs, data, w, h, zywrle_level | 0x80);
+ }
+ else
+#endif
+ {
+#ifdef ZRLE_COMPACT_PIXEL
+ ZRLE_PIXEL *ptr;
+
+ for (ptr = data; ptr < data + w * h; ptr++) {
+ ZRLE_WRITE_PIXEL(vs, *ptr);
+ }
+#else
+ vnc_write(vs, data, w * h * (ZRLE_BPP / 8));
+#endif
+ }
+ }
+}
+
+#undef ZRLE_PIXEL
+#undef ZRLE_WRITE_PIXEL
+#undef ZRLE_ENCODE
+#undef ZRLE_ENCODE_TILE
+#undef ZYWRLE_ENCODE_TILE
+#undef ZRLE_BPP_OUT
+#undef ZRLE_WRITE_SUFFIX
+#undef ZRLE_ENCODE_SUFFIX
Code Review / kvmfornfv.git / blobdiff