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Diffstat (limited to 'ui/vnc-encoding-tight.c')
| -rw-r--r-- | ui/vnc-encoding-tight.c | 1520 |
1 files changed, 1520 insertions, 0 deletions
diff --git a/ui/vnc-encoding-tight.c b/ui/vnc-encoding-tight.c new file mode 100644 index 0000000000..c1a292bdd2 --- /dev/null +++ b/ui/vnc-encoding-tight.c @@ -0,0 +1,1520 @@ +/* + * 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-common.h" + +#ifdef CONFIG_VNC_JPEG +#include <stdio.h> +#include <jpeglib.h> +#endif + +#include "bswap.h" +#include "qdict.h" +#include "qint.h" +#include "vnc.h" +#include "vnc-encoding-tight.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 }, + { 65536, 2048, 32, 8192, 9, 9, 9, 6, 200, 500, 96, 80, 200, 500 } +}; + +/* + * Code to guess if given rectangle is suitable for smooth image + * compression (by applying "gradient" filter or JPEG coder). + */ + +static uint +tight_detect_smooth_image24(VncState *vs, int w, int h) +{ + int off; + int x, y, d, dx; + uint c; + uint stats[256]; + int pixels = 0; + int pix, left[3]; + uint errors; + unsigned char *buf = vs->tight.buffer; + + /* + * If client is big-endian, color samples begin from the second + * byte (offset 1) of a 32-bit pixel value. + */ + off = !!(vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG); + + memset(stats, 0, sizeof (stats)); + + for (y = 0, x = 0; y < h && x < w;) { + for (d = 0; d < h - y && d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; + d++) { + for (c = 0; c < 3; c++) { + left[c] = buf[((y+d)*w+x+d)*4+off+c] & 0xFF; + } + for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; dx++) { + for (c = 0; c < 3; c++) { + pix = buf[((y+d)*w+x+d+dx)*4+off+c] & 0xFF; + stats[abs(pix - left[c])]++; + left[c] = pix; + } + pixels++; + } + } + if (w > h) { + x += h; + y = 0; + } else { + x = 0; + y += w; + } + } + + /* 95% smooth or more ... */ + if (stats[0] * 33 / pixels >= 95) { + return 0; + } + + errors = 0; + for (c = 1; c < 8; c++) { + errors += stats[c] * (c * c); + if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { + return 0; + } + } + for (; c < 256; c++) { + errors += stats[c] * (c * c); + } + errors /= (pixels * 3 - stats[0]); + + return errors; +} + +#define DEFINE_DETECT_FUNCTION(bpp) \ + \ + static uint \ + tight_detect_smooth_image##bpp(VncState *vs, int w, int h) { \ + bool endian; \ + uint##bpp##_t pix; \ + int max[3], shift[3]; \ + int x, y, d, dx; \ + uint c; \ + uint stats[256]; \ + int pixels = 0; \ + int sample, sum, left[3]; \ + uint errors; \ + unsigned char *buf = vs->tight.buffer; \ + \ + endian = ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) != \ + (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)); \ + \ + \ + max[0] = vs->clientds.pf.rmax; \ + max[1] = vs->clientds.pf.gmax; \ + max[2] = vs->clientds.pf.bmax; \ + shift[0] = vs->clientds.pf.rshift; \ + shift[1] = vs->clientds.pf.gshift; \ + shift[2] = vs->clientds.pf.bshift; \ + \ + memset(stats, 0, sizeof(stats)); \ + \ + y = 0, x = 0; \ + while (y < h && x < w) { \ + for (d = 0; d < h - y && \ + d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; d++) { \ + pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d]; \ + if (endian) { \ + pix = bswap_##bpp(pix); \ + } \ + for (c = 0; c < 3; c++) { \ + left[c] = (int)(pix >> shift[c] & max[c]); \ + } \ + for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; \ + dx++) { \ + pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d+dx]; \ + if (endian) { \ + pix = bswap_##bpp(pix); \ + } \ + sum = 0; \ + for (c = 0; c < 3; c++) { \ + sample = (int)(pix >> shift[c] & max[c]); \ + sum += abs(sample - left[c]); \ + left[c] = sample; \ + } \ + if (sum > 255) { \ + sum = 255; \ + } \ + stats[sum]++; \ + pixels++; \ + } \ + } \ + if (w > h) { \ + x += h; \ + y = 0; \ + } else { \ + x = 0; \ + y += w; \ + } \ + } \ + \ + if ((stats[0] + stats[1]) * 100 / pixels >= 90) { \ + return 0; \ + } \ + \ + errors = 0; \ + for (c = 1; c < 8; c++) { \ + errors += stats[c] * (c * c); \ + if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { \ + return 0; \ + } \ + } \ + for (; c < 256; c++) { \ + errors += stats[c] * (c * c); \ + } \ + errors /= (pixels - stats[0]); \ + \ + return errors; \ + } + +DEFINE_DETECT_FUNCTION(16) +DEFINE_DETECT_FUNCTION(32) + +static int +tight_detect_smooth_image(VncState *vs, int w, int h) +{ + uint errors; + int compression = vs->tight_compression; + int quality = vs->tight_quality; + + if (!vs->vd->lossy) { + return 0; + } + + if (ds_get_bytes_per_pixel(vs->ds) == 1 || + vs->clientds.pf.bytes_per_pixel == 1 || + w < VNC_TIGHT_DETECT_MIN_WIDTH || h < VNC_TIGHT_DETECT_MIN_HEIGHT) { + return 0; + } + + if (vs->tight_quality != -1) { + if (w * h < VNC_TIGHT_JPEG_MIN_RECT_SIZE) { + return 0; + } + } else { + if (w * h < tight_conf[compression].gradient_min_rect_size) { + return 0; + } + } + + if (vs->clientds.pf.bytes_per_pixel == 4) { + if (vs->tight_pixel24) { + errors = tight_detect_smooth_image24(vs, w, h); + if (vs->tight_quality != -1) { + return (errors < tight_conf[quality].jpeg_threshold24); + } + return (errors < tight_conf[compression].gradient_threshold24); + } else { + errors = tight_detect_smooth_image32(vs, w, h); + } + } else { + errors = tight_detect_smooth_image16(vs, w, h); + } + if (quality != -1) { + return (errors < tight_conf[quality].jpeg_threshold); + } + return (errors < tight_conf[compression].gradient_threshold); +} + +/* + * Code to determine how many different colors used in rectangle. + */ + +static void tight_palette_rgb2buf(uint32_t rgb, int bpp, uint8_t buf[6]) +{ + memset(buf, 0, 6); + + if (bpp == 32) { + buf[0] = ((rgb >> 24) & 0xFF); + buf[1] = ((rgb >> 16) & 0xFF); + buf[2] = ((rgb >> 8) & 0xFF); + buf[3] = ((rgb >> 0) & 0xFF); + buf[4] = ((buf[0] & 1) == 0) << 3 | ((buf[1] & 1) == 0) << 2; + buf[4]|= ((buf[2] & 1) == 0) << 1 | ((buf[3] & 1) == 0) << 0; + buf[0] |= 1; + buf[1] |= 1; + buf[2] |= 1; + buf[3] |= 1; + } + if (bpp == 16) { + buf[0] = ((rgb >> 8) & 0xFF); + buf[1] = ((rgb >> 0) & 0xFF); + buf[2] = ((buf[0] & 1) == 0) << 1 | ((buf[1] & 1) == 0) << 0; + buf[0] |= 1; + buf[1] |= 1; + } +} + +static uint32_t tight_palette_buf2rgb(int bpp, const uint8_t *buf) +{ + uint32_t rgb = 0; + + if (bpp == 32) { + rgb |= ((buf[0] & ~1) | !((buf[4] >> 3) & 1)) << 24; + rgb |= ((buf[1] & ~1) | !((buf[4] >> 2) & 1)) << 16; + rgb |= ((buf[2] & ~1) | !((buf[4] >> 1) & 1)) << 8; + rgb |= ((buf[3] & ~1) | !((buf[4] >> 0) & 1)) << 0; + } + if (bpp == 16) { + rgb |= ((buf[0] & ~1) | !((buf[2] >> 1) & 1)) << 8; + rgb |= ((buf[1] & ~1) | !((buf[2] >> 0) & 1)) << 0; + } + return rgb; +} + + +static int tight_palette_insert(QDict *palette, uint32_t rgb, int bpp, int max) +{ + uint8_t key[6]; + int idx = qdict_size(palette); + bool present; + + tight_palette_rgb2buf(rgb, bpp, key); + present = qdict_haskey(palette, (char *)key); + if (idx >= max && !present) { + return 0; + } + if (!present) { + qdict_put(palette, (char *)key, qint_from_int(idx)); + } + return qdict_size(palette); +} + +#define DEFINE_FILL_PALETTE_FUNCTION(bpp) \ + \ + static int \ + tight_fill_palette##bpp(VncState *vs, int x, int y, \ + int max, size_t count, \ + uint32_t *bg, uint32_t *fg, \ + struct QDict **palette) { \ + uint##bpp##_t *data; \ + uint##bpp##_t c0, c1, ci; \ + int i, n0, n1; \ + \ + data = (uint##bpp##_t *)vs->tight.buffer; \ + \ + c0 = data[0]; \ + i = 1; \ + while (i < count && data[i] == c0) \ + i++; \ + if (i >= count) { \ + *bg = *fg = c0; \ + return 1; \ + } \ + \ + if (max < 2) { \ + return 0; \ + } \ + \ + n0 = i; \ + c1 = data[i]; \ + n1 = 0; \ + for (i++; i < count; i++) { \ + ci = data[i]; \ + if (ci == c0) { \ + n0++; \ + } else if (ci == c1) { \ + n1++; \ + } else \ + break; \ + } \ + if (i >= count) { \ + if (n0 > n1) { \ + *bg = (uint32_t)c0; \ + *fg = (uint32_t)c1; \ + } else { \ + *bg = (uint32_t)c1; \ + *fg = (uint32_t)c0; \ + } \ + return 2; \ + } \ + \ + if (max == 2) { \ + return 0; \ + } \ + \ + *palette = qdict_new(); \ + tight_palette_insert(*palette, c0, bpp, max); \ + tight_palette_insert(*palette, c1, bpp, max); \ + tight_palette_insert(*palette, ci, bpp, max); \ + \ + for (i++; i < count; i++) { \ + if (data[i] == ci) { \ + continue; \ + } else { \ + if (!tight_palette_insert(*palette, (uint32_t)ci, \ + bpp, max)) { \ + return 0; \ + } \ + ci = data[i]; \ + } \ + } \ + \ + return qdict_size(*palette); \ + } + +DEFINE_FILL_PALETTE_FUNCTION(8) +DEFINE_FILL_PALETTE_FUNCTION(16) +DEFINE_FILL_PALETTE_FUNCTION(32) + +static int tight_fill_palette(VncState *vs, int x, int y, + size_t count, uint32_t *bg, uint32_t *fg, + struct QDict **palette) +{ + int max; + + max = count / tight_conf[vs->tight_compression].idx_max_colors_divisor; + if (max < 2 && + count >= tight_conf[vs->tight_compression].mono_min_rect_size) { + max = 2; + } + if (max >= 256) { + max = 256; + } + + switch(vs->clientds.pf.bytes_per_pixel) { + case 4: + return tight_fill_palette32(vs, x, y, max, count, bg, fg, palette); + case 2: + return tight_fill_palette16(vs, x, y, max, count, bg, fg, palette); + default: + max = 2; + return tight_fill_palette8(vs, x, y, max, count, bg, fg, palette); + } + return 0; +} + +/* Callback to dump a palette with qdict_iter +static void print_palette(const char *key, QObject *obj, void *opaque) +{ + uint8_t idx = qint_get_int(qobject_to_qint(obj)); + uint32_t rgb = tight_palette_buf2rgb(32, (uint8_t *)key); + + fprintf(stderr, "%.2x ", (unsigned char)*key); + while (*key++) + fprintf(stderr, "%.2x ", (unsigned char)*key); + + fprintf(stderr, ": idx: %x rgb: %x\n", idx, rgb); +} +*/ + +/* + * Converting truecolor samples into palette indices. + */ +#define DEFINE_IDX_ENCODE_FUNCTION(bpp) \ + \ + static void \ + tight_encode_indexed_rect##bpp(uint8_t *buf, int count, \ + struct QDict *palette) { \ + uint##bpp##_t *src; \ + uint##bpp##_t rgb; \ + uint8_t key[6]; \ + int i, rep; \ + uint8_t idx; \ + \ + src = (uint##bpp##_t *) buf; \ + \ + for (i = 0; i < count; i++) { \ + rgb = *src++; \ + rep = 0; \ + while (i < count && *src == rgb) { \ + rep++, src++, i++; \ + } \ + tight_palette_rgb2buf(rgb, bpp, key); \ + if (!qdict_haskey(palette, (char *)key)) { \ + /* \ + * Should never happen, but don't break everything \ + * if it does, use the first color instead \ + */ \ + idx = 0; \ + } else { \ + idx = qdict_get_int(palette, (char *)key); \ + } \ + while (rep >= 0) { \ + *buf++ = idx; \ + rep--; \ + } \ + } \ + } + +DEFINE_IDX_ENCODE_FUNCTION(16) +DEFINE_IDX_ENCODE_FUNCTION(32) + +#define DEFINE_MONO_ENCODE_FUNCTION(bpp) \ + \ + static void \ + tight_encode_mono_rect##bpp(uint8_t *buf, int w, int h, \ + uint##bpp##_t bg, uint##bpp##_t fg) { \ + uint##bpp##_t *ptr; \ + unsigned int value, mask; \ + int aligned_width; \ + int x, y, bg_bits; \ + \ + ptr = (uint##bpp##_t *) buf; \ + aligned_width = w - w % 8; \ + \ + for (y = 0; y < h; y++) { \ + for (x = 0; x < aligned_width; x += 8) { \ + for (bg_bits = 0; bg_bits < 8; bg_bits++) { \ + if (*ptr++ != bg) { \ + break; \ + } \ + } \ + if (bg_bits == 8) { \ + *buf++ = 0; \ + continue; \ + } \ + mask = 0x80 >> bg_bits; \ + value = mask; \ + for (bg_bits++; bg_bits < 8; bg_bits++) { \ + mask >>= 1; \ + if (*ptr++ != bg) { \ + value |= mask; \ + } \ + } \ + *buf++ = (uint8_t)value; \ + } \ + \ + mask = 0x80; \ + value = 0; \ + if (x >= w) { \ + continue; \ + } \ + \ + for (; x < w; x++) { \ + if (*ptr++ != bg) { \ + value |= mask; \ + } \ + mask >>= 1; \ + } \ + *buf++ = (uint8_t)value; \ + } \ + } + +DEFINE_MONO_ENCODE_FUNCTION(8) +DEFINE_MONO_ENCODE_FUNCTION(16) +DEFINE_MONO_ENCODE_FUNCTION(32) + +/* + * ``Gradient'' filter for 24-bit color samples. + * Should be called only when redMax, greenMax and blueMax are 255. + * Color components assumed to be byte-aligned. + */ + +static void +tight_filter_gradient24(VncState *vs, uint8_t *buf, int w, int h) +{ + uint32_t *buf32; + uint32_t pix32; + int shift[3]; + int *prev; + int here[3], upper[3], left[3], upperleft[3]; + int prediction; + int x, y, c; + + buf32 = (uint32_t *)buf; + memset(vs->tight_gradient.buffer, 0, w * 3 * sizeof(int)); + + if ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) == + (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)) { + shift[0] = vs->clientds.pf.rshift; + shift[1] = vs->clientds.pf.gshift; + shift[2] = vs->clientds.pf.bshift; + } else { + shift[0] = 24 - vs->clientds.pf.rshift; + shift[1] = 24 - vs->clientds.pf.gshift; + shift[2] = 24 - vs->clientds.pf.bshift; + } + + for (y = 0; y < h; y++) { + for (c = 0; c < 3; c++) { + upper[c] = 0; + here[c] = 0; + } + prev = (int *)vs->tight_gradient.buffer; + for (x = 0; x < w; x++) { + pix32 = *buf32++; + for (c = 0; c < 3; c++) { + upperleft[c] = upper[c]; + left[c] = here[c]; + upper[c] = *prev; + here[c] = (int)(pix32 >> shift[c] & 0xFF); + *prev++ = here[c]; + + prediction = left[c] + upper[c] - upperleft[c]; + if (prediction < 0) { + prediction = 0; + } else if (prediction > 0xFF) { + prediction = 0xFF; + } + *buf++ = (char)(here[c] - prediction); + } + } + } +} + + +/* + * ``Gradient'' filter for other color depths. + */ + +#define DEFINE_GRADIENT_FILTER_FUNCTION(bpp) \ + \ + static void \ + tight_filter_gradient##bpp(VncState *vs, uint##bpp##_t *buf, \ + int w, int h) { \ + uint##bpp##_t pix, diff; \ + bool endian; \ + int *prev; \ + int max[3], shift[3]; \ + int here[3], upper[3], left[3], upperleft[3]; \ + int prediction; \ + int x, y, c; \ + \ + memset (vs->tight_gradient.buffer, 0, w * 3 * sizeof(int)); \ + \ + endian = ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) != \ + (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)); \ + \ + max[0] = vs->clientds.pf.rmax; \ + max[1] = vs->clientds.pf.gmax; \ + max[2] = vs->clientds.pf.bmax; \ + shift[0] = vs->clientds.pf.rshift; \ + shift[1] = vs->clientds.pf.gshift; \ + shift[2] = vs->clientds.pf.bshift; \ + \ + for (y = 0; y < h; y++) { \ + for (c = 0; c < 3; c++) { \ + upper[c] = 0; \ + here[c] = 0; \ + } \ + prev = (int *)vs->tight_gradient.buffer; \ + for (x = 0; x < w; x++) { \ + pix = *buf; \ + if (endian) { \ + pix = bswap_##bpp(pix); \ + } \ + diff = 0; \ + for (c = 0; c < 3; c++) { \ + upperleft[c] = upper[c]; \ + left[c] = here[c]; \ + upper[c] = *prev; \ + here[c] = (int)(pix >> shift[c] & max[c]); \ + *prev++ = here[c]; \ + \ + prediction = left[c] + upper[c] - upperleft[c]; \ + if (prediction < 0) { \ + prediction = 0; \ + } else if (prediction > max[c]) { \ + prediction = max[c]; \ + } \ + diff |= ((here[c] - prediction) & max[c]) \ + << shift[c]; \ + } \ + if (endian) { \ + diff = bswap_##bpp(diff); \ + } \ + *buf++ = diff; \ + } \ + } \ + } + +DEFINE_GRADIENT_FILTER_FUNCTION(16) +DEFINE_GRADIENT_FILTER_FUNCTION(32) + +/* + * Check if a rectangle is all of the same color. If needSameColor is + * set to non-zero, then also check that its color equals to the + * *colorPtr value. The result is 1 if the test is successfull, and in + * that case new color will be stored in *colorPtr. + */ + +#define DEFINE_CHECK_SOLID_FUNCTION(bpp) \ + \ + static bool \ + check_solid_tile##bpp(VncState *vs, int x, int y, int w, int h, \ + uint32_t* color, bool samecolor) \ + { \ + VncDisplay *vd = vs->vd; \ + uint##bpp##_t *fbptr; \ + uint##bpp##_t c; \ + int dx, dy; \ + \ + fbptr = (uint##bpp##_t *) \ + (vd->server->data + y * ds_get_linesize(vs->ds) + \ + x * ds_get_bytes_per_pixel(vs->ds)); \ + \ + c = *fbptr; \ + if (samecolor && (uint32_t)c != *color) { \ + return false; \ + } \ + \ + for (dy = 0; dy < h; dy++) { \ + for (dx = 0; dx < w; dx++) { \ + if (c != fbptr[dx]) { \ + return false; \ + } \ + } \ + fbptr = (uint##bpp##_t *) \ + ((uint8_t *)fbptr + ds_get_linesize(vs->ds)); \ + } \ + \ + *color = (uint32_t)c; \ + return true; \ + } + +DEFINE_CHECK_SOLID_FUNCTION(32) +DEFINE_CHECK_SOLID_FUNCTION(16) +DEFINE_CHECK_SOLID_FUNCTION(8) + +static bool check_solid_tile(VncState *vs, int x, int y, int w, int h, + uint32_t* color, bool samecolor) +{ + VncDisplay *vd = vs->vd; + + switch(vd->server->pf.bytes_per_pixel) { + case 4: + return check_solid_tile32(vs, x, y, w, h, color, samecolor); + case 2: + return check_solid_tile16(vs, x, y, w, h, color, samecolor); + default: + return check_solid_tile8(vs, x, y, w, h, color, samecolor); + } +} + +static void find_best_solid_area(VncState *vs, int x, int y, int w, int h, + uint32_t color, int *w_ptr, int *h_ptr) +{ + int dx, dy, dw, dh; + int w_prev; + int w_best = 0, h_best = 0; + + w_prev = w; + + for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { + + dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy); + dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev); + + if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) { + break; + } + + for (dx = x + dw; dx < x + w_prev;) { + dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx); + + if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) { + break; + } + dx += dw; + } + + w_prev = dx - x; + if (w_prev * (dy + dh - y) > w_best * h_best) { + w_best = w_prev; + h_best = dy + dh - y; + } + } + + *w_ptr = w_best; + *h_ptr = h_best; +} + +static void extend_solid_area(VncState *vs, int x, int y, int w, int h, + uint32_t color, int *x_ptr, int *y_ptr, + int *w_ptr, int *h_ptr) +{ + int cx, cy; + + /* Try to extend the area upwards. */ + for ( cy = *y_ptr - 1; + cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); + cy-- ); + *h_ptr += *y_ptr - (cy + 1); + *y_ptr = cy + 1; + + /* ... downwards. */ + for ( cy = *y_ptr + *h_ptr; + cy < y + h && + check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); + cy++ ); + *h_ptr += cy - (*y_ptr + *h_ptr); + + /* ... to the left. */ + for ( cx = *x_ptr - 1; + cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); + cx-- ); + *w_ptr += *x_ptr - (cx + 1); + *x_ptr = cx + 1; + + /* ... to the right. */ + for ( cx = *x_ptr + *w_ptr; + cx < x + w && + check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); + cx++ ); + *w_ptr += cx - (*x_ptr + *w_ptr); +} + +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 bool send_gradient_rect(VncState *vs, int w, int h) +{ + int stream = 3; + int level = tight_conf[vs->tight_compression].gradient_zlib_level; + size_t bytes; + + if (vs->clientds.pf.bytes_per_pixel == 1) + return send_full_color_rect(vs, w, h); + + vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); + vnc_write_u8(vs, VNC_TIGHT_FILTER_GRADIENT); + + buffer_reserve(&vs->tight_gradient, w * 3 * sizeof (int)); + + if (vs->tight_pixel24) { + tight_filter_gradient24(vs, vs->tight.buffer, w, h); + bytes = 3; + } else if (vs->clientds.pf.bytes_per_pixel == 4) { + tight_filter_gradient32(vs, (uint32_t *)vs->tight.buffer, w, h); + bytes = 4; + } else { + tight_filter_gradient16(vs, (uint16_t *)vs->tight.buffer, w, h); + bytes = 2; + } + + buffer_reset(&vs->tight_gradient); + + bytes = w * h * bytes; + vs->tight.offset = bytes; + + bytes = tight_compress_data(vs, stream, bytes, + level, Z_FILTERED); + return (bytes >= 0); +} + +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); +} + +/* + * JPEG compression stuff. + */ +#ifdef CONFIG_VNC_JPEG +static void jpeg_prepare_row24(VncState *vs, uint8_t *dst, int x, int y, + int count) +{ + VncDisplay *vd = vs->vd; + uint32_t *fbptr; + uint32_t pix; + + fbptr = (uint32_t *)(vd->server->data + y * ds_get_linesize(vs->ds) + + x * ds_get_bytes_per_pixel(vs->ds)); + + while (count--) { + pix = *fbptr++; + *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.rshift); + *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.gshift); + *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.bshift); + } +} + +#define DEFINE_JPEG_GET_ROW_FUNCTION(bpp) \ + \ + static void \ + jpeg_prepare_row##bpp(VncState *vs, uint8_t *dst, \ + int x, int y, int count) \ + { \ + VncDisplay *vd = vs->vd; \ + uint##bpp##_t *fbptr; \ + uint##bpp##_t pix; \ + int r, g, b; \ + \ + fbptr = (uint##bpp##_t *) \ + (vd->server->data + y * ds_get_linesize(vs->ds) + \ + x * ds_get_bytes_per_pixel(vs->ds)); \ + \ + while (count--) { \ + pix = *fbptr++; \ + \ + r = (int)((pix >> vs->ds->surface->pf.rshift) \ + & vs->ds->surface->pf.rmax); \ + g = (int)((pix >> vs->ds->surface->pf.gshift) \ + & vs->ds->surface->pf.gmax); \ + b = (int)((pix >> vs->ds->surface->pf.bshift) \ + & vs->ds->surface->pf.bmax); \ + \ + *dst++ = (uint8_t)((r * 255 + vs->ds->surface->pf.rmax / 2) \ + / vs->ds->surface->pf.rmax); \ + *dst++ = (uint8_t)((g * 255 + vs->ds->surface->pf.gmax / 2) \ + / vs->ds->surface->pf.gmax); \ + *dst++ = (uint8_t)((b * 255 + vs->ds->surface->pf.bmax / 2) \ + / vs->ds->surface->pf.bmax); \ + } \ + } + +DEFINE_JPEG_GET_ROW_FUNCTION(16) +DEFINE_JPEG_GET_ROW_FUNCTION(32) + +static void jpeg_prepare_row(VncState *vs, uint8_t *dst, int x, int y, + int count) +{ + if (vs->tight_pixel24) + jpeg_prepare_row24(vs, dst, x, y, count); + else if (ds_get_bytes_per_pixel(vs->ds) == 4) + jpeg_prepare_row32(vs, dst, x, y, count); + else + jpeg_prepare_row16(vs, dst, x, y, count); +} + +/* + * Destination manager implementation for JPEG library. + */ + +/* This is called once per encoding */ +static void jpeg_init_destination(j_compress_ptr cinfo) +{ + VncState *vs = cinfo->client_data; + Buffer *buffer = &vs->tight_jpeg; + + cinfo->dest->next_output_byte = (JOCTET *)buffer->buffer + buffer->offset; + cinfo->dest->free_in_buffer = (size_t)(buffer->capacity - buffer->offset); +} + +/* This is called when we ran out of buffer (shouldn't happen!) */ +static boolean jpeg_empty_output_buffer(j_compress_ptr cinfo) +{ + VncState *vs = cinfo->client_data; + Buffer *buffer = &vs->tight_jpeg; + + buffer->offset = buffer->capacity; + buffer_reserve(buffer, 2048); + jpeg_init_destination(cinfo); + return TRUE; +} + +/* This is called when we are done processing data */ +static void jpeg_term_destination(j_compress_ptr cinfo) +{ + VncState *vs = cinfo->client_data; + Buffer *buffer = &vs->tight_jpeg; + + buffer->offset = buffer->capacity - cinfo->dest->free_in_buffer; +} + +static int send_jpeg_rect(VncState *vs, int x, int y, int w, int h, int quality) +{ + struct jpeg_compress_struct cinfo; + struct jpeg_error_mgr jerr; + struct jpeg_destination_mgr manager; + JSAMPROW row[1]; + uint8_t *buf; + int dy; + + if (ds_get_bytes_per_pixel(vs->ds) == 1) + return send_full_color_rect(vs, w, h); + + buf = qemu_malloc(w * 3); + row[0] = buf; + buffer_reserve(&vs->tight_jpeg, 2048); + + cinfo.err = jpeg_std_error(&jerr); + jpeg_create_compress(&cinfo); + + cinfo.client_data = vs; + cinfo.image_width = w; + cinfo.image_height = h; + cinfo.input_components = 3; + cinfo.in_color_space = JCS_RGB; + + jpeg_set_defaults(&cinfo); + jpeg_set_quality(&cinfo, quality, true); + + manager.init_destination = jpeg_init_destination; + manager.empty_output_buffer = jpeg_empty_output_buffer; + manager.term_destination = jpeg_term_destination; + cinfo.dest = &manager; + + jpeg_start_compress(&cinfo, true); + + for (dy = 0; dy < h; dy++) { + jpeg_prepare_row(vs, buf, x, y + dy, w); + jpeg_write_scanlines(&cinfo, row, 1); + } + + jpeg_finish_compress(&cinfo); + jpeg_destroy_compress(&cinfo); + + vnc_write_u8(vs, VNC_TIGHT_JPEG << 4); + + tight_send_compact_size(vs, vs->tight_jpeg.offset); + vnc_write(vs, vs->tight_jpeg.buffer, vs->tight_jpeg.offset); + buffer_reset(&vs->tight_jpeg); + + return 1; +} +#endif /* CONFIG_VNC_JPEG */ + +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) { + if (tight_detect_smooth_image(vs, w, h)) { + if (vs->tight_quality == -1) { + ret = send_gradient_rect(vs, w, h); + } else { +#ifdef CONFIG_VNC_JPEG + int quality = tight_conf[vs->tight_quality].jpeg_quality; + + ret = send_jpeg_rect(vs, x, y, w, h, quality); +#else + ret = send_full_color_rect(vs, w, h); +#endif + } + } else { + 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) { +#ifdef CONFIG_VNC_JPEG + if (colors > 96 && vs->tight_quality != -1 && vs->tight_quality <= 3 && + tight_detect_smooth_image(vs, w, h)) { + int quality = tight_conf[vs->tight_quality].jpeg_quality; + + ret = send_jpeg_rect(vs, x, y, w, h, quality); + } else { + ret = send_palette_rect(vs, w, h, palette); + } +#else + ret = send_palette_rect(vs, w, h, palette); +#endif + } + 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); + buffer_free(&vs->tight_gradient); +#ifdef CONFIG_VNC_JPEG + buffer_free(&vs->tight_jpeg); +#endif +} |