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-rw-r--r--libvncserver/tight.c1820
1 files changed, 1820 insertions, 0 deletions
diff --git a/libvncserver/tight.c b/libvncserver/tight.c
new file mode 100644
index 0000000..b97adb9
--- /dev/null
+++ b/libvncserver/tight.c
@@ -0,0 +1,1820 @@
+/*
+ * tight.c
+ *
+ * Routines to implement Tight Encoding
+ */
+
+/*
+ * Copyright (C) 2000, 2001 Const Kaplinsky. All Rights Reserved.
+ * Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+ * USA.
+ */
+
+/*#include <stdio.h>*/
+#include <rfb/rfb.h>
+
+#ifdef WIN32
+#define XMD_H
+#undef FAR
+#define NEEDFAR_POINTERS
+#endif
+
+#include <jpeglib.h>
+
+/* Note: The following constant should not be changed. */
+#define TIGHT_MIN_TO_COMPRESS 12
+
+/* The parameters below may be adjusted. */
+#define MIN_SPLIT_RECT_SIZE 4096
+#define MIN_SOLID_SUBRECT_SIZE 2048
+#define MAX_SPLIT_TILE_SIZE 16
+
+/* May be set to TRUE with "-lazytight" Xvnc option. */
+rfbBool rfbTightDisableGradient = FALSE;
+
+/* This variable is set on every rfbSendRectEncodingTight() call. */
+static rfbBool usePixelFormat24;
+
+
+/* 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). */
+
+typedef struct TIGHT_CONF_s {
+ int maxRectSize, maxRectWidth;
+ int monoMinRectSize, gradientMinRectSize;
+ int idxZlibLevel, monoZlibLevel, rawZlibLevel, gradientZlibLevel;
+ int gradientThreshold, gradientThreshold24;
+ int idxMaxColorsDivisor;
+ int jpegQuality, jpegThreshold, jpegThreshold24;
+} TIGHT_CONF;
+
+static TIGHT_CONF tightConf[10] = {
+ { 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 }
+};
+
+static int compressLevel;
+static int qualityLevel;
+
+/* Stuff dealing with palettes. */
+
+typedef struct COLOR_LIST_s {
+ struct COLOR_LIST_s *next;
+ int idx;
+ uint32_t rgb;
+} COLOR_LIST;
+
+typedef struct PALETTE_ENTRY_s {
+ COLOR_LIST *listNode;
+ int numPixels;
+} PALETTE_ENTRY;
+
+typedef struct PALETTE_s {
+ PALETTE_ENTRY entry[256];
+ COLOR_LIST *hash[256];
+ COLOR_LIST list[256];
+} PALETTE;
+
+static int paletteNumColors, paletteMaxColors;
+static uint32_t monoBackground, monoForeground;
+static PALETTE palette;
+
+/* Pointers to dynamically-allocated buffers. */
+
+static int tightBeforeBufSize = 0;
+static char *tightBeforeBuf = NULL;
+
+static int tightAfterBufSize = 0;
+static char *tightAfterBuf = NULL;
+
+static int *prevRowBuf = NULL;
+
+void TightCleanup()
+{
+ if(tightBeforeBufSize) {
+ free(tightBeforeBuf);
+ tightBeforeBufSize=0;
+ }
+ if(tightAfterBufSize) {
+ free(tightAfterBuf);
+ tightAfterBufSize=0;
+ }
+}
+
+/* Prototypes for static functions. */
+
+static void FindBestSolidArea (rfbClientPtr cl, int x, int y, int w, int h,
+ uint32_t colorValue, int *w_ptr, int *h_ptr);
+static void ExtendSolidArea (rfbClientPtr cl, int x, int y, int w, int h,
+ uint32_t colorValue,
+ int *x_ptr, int *y_ptr, int *w_ptr, int *h_ptr);
+static rfbBool CheckSolidTile (rfbClientPtr cl, int x, int y, int w, int h,
+ uint32_t *colorPtr, rfbBool needSameColor);
+static rfbBool CheckSolidTile8 (rfbClientPtr cl, int x, int y, int w, int h,
+ uint32_t *colorPtr, rfbBool needSameColor);
+static rfbBool CheckSolidTile16 (rfbClientPtr cl, int x, int y, int w, int h,
+ uint32_t *colorPtr, rfbBool needSameColor);
+static rfbBool CheckSolidTile32 (rfbClientPtr cl, int x, int y, int w, int h,
+ uint32_t *colorPtr, rfbBool needSameColor);
+
+static rfbBool SendRectSimple (rfbClientPtr cl, int x, int y, int w, int h);
+static rfbBool SendSubrect (rfbClientPtr cl, int x, int y, int w, int h);
+static rfbBool SendTightHeader (rfbClientPtr cl, int x, int y, int w, int h);
+
+static rfbBool SendSolidRect (rfbClientPtr cl);
+static rfbBool SendMonoRect (rfbClientPtr cl, int w, int h);
+static rfbBool SendIndexedRect (rfbClientPtr cl, int w, int h);
+static rfbBool SendFullColorRect (rfbClientPtr cl, int w, int h);
+static rfbBool SendGradientRect (rfbClientPtr cl, int w, int h);
+
+static rfbBool CompressData(rfbClientPtr cl, int streamId, int dataLen,
+ int zlibLevel, int zlibStrategy);
+static rfbBool SendCompressedData(rfbClientPtr cl, int compressedLen);
+
+static void FillPalette8(int count);
+static void FillPalette16(int count);
+static void FillPalette32(int count);
+
+static void PaletteReset(void);
+static int PaletteInsert(uint32_t rgb, int numPixels, int bpp);
+
+static void Pack24(rfbClientPtr cl, char *buf, rfbPixelFormat *fmt, int count);
+
+static void EncodeIndexedRect16(uint8_t *buf, int count);
+static void EncodeIndexedRect32(uint8_t *buf, int count);
+
+static void EncodeMonoRect8(uint8_t *buf, int w, int h);
+static void EncodeMonoRect16(uint8_t *buf, int w, int h);
+static void EncodeMonoRect32(uint8_t *buf, int w, int h);
+
+static void FilterGradient24(rfbClientPtr cl, char *buf, rfbPixelFormat *fmt, int w, int h);
+static void FilterGradient16(rfbClientPtr cl, uint16_t *buf, rfbPixelFormat *fmt, int w, int h);
+static void FilterGradient32(rfbClientPtr cl, uint32_t *buf, rfbPixelFormat *fmt, int w, int h);
+
+static int DetectSmoothImage(rfbClientPtr cl, rfbPixelFormat *fmt, int w, int h);
+static unsigned long DetectSmoothImage24(rfbClientPtr cl, rfbPixelFormat *fmt, int w, int h);
+static unsigned long DetectSmoothImage16(rfbClientPtr cl, rfbPixelFormat *fmt, int w, int h);
+static unsigned long DetectSmoothImage32(rfbClientPtr cl, rfbPixelFormat *fmt, int w, int h);
+
+static rfbBool SendJpegRect(rfbClientPtr cl, int x, int y, int w, int h,
+ int quality);
+static void PrepareRowForJpeg(rfbClientPtr cl, uint8_t *dst, int x, int y, int count);
+static void PrepareRowForJpeg24(rfbClientPtr cl, uint8_t *dst, int x, int y, int count);
+static void PrepareRowForJpeg16(rfbClientPtr cl, uint8_t *dst, int x, int y, int count);
+static void PrepareRowForJpeg32(rfbClientPtr cl, uint8_t *dst, int x, int y, int count);
+
+static void JpegInitDestination(j_compress_ptr cinfo);
+static boolean JpegEmptyOutputBuffer(j_compress_ptr cinfo);
+static void JpegTermDestination(j_compress_ptr cinfo);
+static void JpegSetDstManager(j_compress_ptr cinfo);
+
+
+/*
+ * Tight encoding implementation.
+ */
+
+int
+rfbNumCodedRectsTight(cl, x, y, w, h)
+ rfbClientPtr cl;
+ int x, y, w, h;
+{
+ int maxRectSize, maxRectWidth;
+ int subrectMaxWidth, subrectMaxHeight;
+
+ /* No matter how many rectangles we will send if LastRect markers
+ are used to terminate rectangle stream. */
+ if (cl->enableLastRectEncoding && w * h >= MIN_SPLIT_RECT_SIZE)
+ return 0;
+
+ maxRectSize = tightConf[cl->tightCompressLevel].maxRectSize;
+ maxRectWidth = tightConf[cl->tightCompressLevel].maxRectWidth;
+
+ if (w > maxRectWidth || w * h > maxRectSize) {
+ subrectMaxWidth = (w > maxRectWidth) ? maxRectWidth : w;
+ subrectMaxHeight = maxRectSize / subrectMaxWidth;
+ return (((w - 1) / maxRectWidth + 1) *
+ ((h - 1) / subrectMaxHeight + 1));
+ } else {
+ return 1;
+ }
+}
+
+rfbBool
+rfbSendRectEncodingTight(cl, x, y, w, h)
+ rfbClientPtr cl;
+ int x, y, w, h;
+{
+ int nMaxRows;
+ uint32_t colorValue;
+ int dx, dy, dw, dh;
+ int x_best, y_best, w_best, h_best;
+ char *fbptr;
+
+ rfbSendUpdateBuf(cl);
+
+ compressLevel = cl->tightCompressLevel;
+ qualityLevel = cl->tightQualityLevel;
+
+ if ( cl->format.depth == 24 && cl->format.redMax == 0xFF &&
+ cl->format.greenMax == 0xFF && cl->format.blueMax == 0xFF ) {
+ usePixelFormat24 = TRUE;
+ } else {
+ usePixelFormat24 = FALSE;
+ }
+
+ if (!cl->enableLastRectEncoding || w * h < MIN_SPLIT_RECT_SIZE)
+ return SendRectSimple(cl, x, y, w, h);
+
+ /* Make sure we can write at least one pixel into tightBeforeBuf. */
+
+ if (tightBeforeBufSize < 4) {
+ tightBeforeBufSize = 4;
+ if (tightBeforeBuf == NULL)
+ tightBeforeBuf = (char *)malloc(tightBeforeBufSize);
+ else
+ tightBeforeBuf = (char *)realloc(tightBeforeBuf,
+ tightBeforeBufSize);
+ }
+
+ /* Calculate maximum number of rows in one non-solid rectangle. */
+
+ {
+ int maxRectSize, maxRectWidth, nMaxWidth;
+
+ maxRectSize = tightConf[compressLevel].maxRectSize;
+ maxRectWidth = tightConf[compressLevel].maxRectWidth;
+ nMaxWidth = (w > maxRectWidth) ? maxRectWidth : w;
+ nMaxRows = maxRectSize / nMaxWidth;
+ }
+
+ /* Try to find large solid-color areas and send them separately. */
+
+ for (dy = y; dy < y + h; dy += MAX_SPLIT_TILE_SIZE) {
+
+ /* If a rectangle becomes too large, send its upper part now. */
+
+ if (dy - y >= nMaxRows) {
+ if (!SendRectSimple(cl, x, y, w, nMaxRows))
+ return 0;
+ y += nMaxRows;
+ h -= nMaxRows;
+ }
+
+ dh = (dy + MAX_SPLIT_TILE_SIZE <= y + h) ?
+ MAX_SPLIT_TILE_SIZE : (y + h - dy);
+
+ for (dx = x; dx < x + w; dx += MAX_SPLIT_TILE_SIZE) {
+
+ dw = (dx + MAX_SPLIT_TILE_SIZE <= x + w) ?
+ MAX_SPLIT_TILE_SIZE : (x + w - dx);
+
+ if (CheckSolidTile(cl, dx, dy, dw, dh, &colorValue, FALSE)) {
+
+ /* Get dimensions of solid-color area. */
+
+ FindBestSolidArea(cl, dx, dy, w - (dx - x), h - (dy - y),
+ colorValue, &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 < MIN_SOLID_SUBRECT_SIZE )
+ continue;
+
+ /* Try to extend solid rectangle to maximum size. */
+
+ x_best = dx; y_best = dy;
+ ExtendSolidArea(cl, x, y, w, h, colorValue,
+ &x_best, &y_best, &w_best, &h_best);
+
+ /* Send rectangles at top and left to solid-color area. */
+
+ if ( y_best != y &&
+ !SendRectSimple(cl, x, y, w, y_best-y) )
+ return FALSE;
+ if ( x_best != x &&
+ !rfbSendRectEncodingTight(cl, x, y_best,
+ x_best-x, h_best) )
+ return FALSE;
+
+ /* Send solid-color rectangle. */
+
+ if (!SendTightHeader(cl, x_best, y_best, w_best, h_best))
+ return FALSE;
+
+ fbptr = (cl->screen->frameBuffer +
+ (cl->screen->paddedWidthInBytes * y_best) +
+ (x_best * (cl->screen->bitsPerPixel / 8)));
+
+ (*cl->translateFn)(cl->translateLookupTable, &cl->screen->rfbServerFormat,
+ &cl->format, fbptr, tightBeforeBuf,
+ cl->screen->paddedWidthInBytes, 1, 1);
+
+ if (!SendSolidRect(cl))
+ return FALSE;
+
+ /* Send remaining rectangles (at right and bottom). */
+
+ if ( x_best + w_best != x + w &&
+ !rfbSendRectEncodingTight(cl, x_best+w_best, y_best,
+ w-(x_best-x)-w_best, h_best) )
+ return FALSE;
+ if ( y_best + h_best != y + h &&
+ !rfbSendRectEncodingTight(cl, x, y_best+h_best,
+ w, h-(y_best-y)-h_best) )
+ return FALSE;
+
+ /* Return after all recursive calls are done. */
+
+ return TRUE;
+ }
+
+ }
+
+ }
+
+ /* No suitable solid-color rectangles found. */
+
+ return SendRectSimple(cl, x, y, w, h);
+}
+
+static void
+FindBestSolidArea(cl, x, y, w, h, colorValue, w_ptr, h_ptr)
+ rfbClientPtr cl;
+ int x, y, w, h;
+ uint32_t colorValue;
+ int *w_ptr, *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 += MAX_SPLIT_TILE_SIZE) {
+
+ dh = (dy + MAX_SPLIT_TILE_SIZE <= y + h) ?
+ MAX_SPLIT_TILE_SIZE : (y + h - dy);
+ dw = (w_prev > MAX_SPLIT_TILE_SIZE) ?
+ MAX_SPLIT_TILE_SIZE : w_prev;
+
+ if (!CheckSolidTile(cl, x, dy, dw, dh, &colorValue, TRUE))
+ break;
+
+ for (dx = x + dw; dx < x + w_prev;) {
+ dw = (dx + MAX_SPLIT_TILE_SIZE <= x + w_prev) ?
+ MAX_SPLIT_TILE_SIZE : (x + w_prev - dx);
+ if (!CheckSolidTile(cl, dx, dy, dw, dh, &colorValue, 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
+ExtendSolidArea(cl, x, y, w, h, colorValue, x_ptr, y_ptr, w_ptr, h_ptr)
+ rfbClientPtr cl;
+ int x, y, w, h;
+ uint32_t colorValue;
+ int *x_ptr, *y_ptr, *w_ptr, *h_ptr;
+{
+ int cx, cy;
+
+ /* Try to extend the area upwards. */
+ for ( cy = *y_ptr - 1;
+ cy >= y && CheckSolidTile(cl, *x_ptr, cy, *w_ptr, 1, &colorValue, TRUE);
+ cy-- );
+ *h_ptr += *y_ptr - (cy + 1);
+ *y_ptr = cy + 1;
+
+ /* ... downwards. */
+ for ( cy = *y_ptr + *h_ptr;
+ cy < y + h &&
+ CheckSolidTile(cl, *x_ptr, cy, *w_ptr, 1, &colorValue, TRUE);
+ cy++ );
+ *h_ptr += cy - (*y_ptr + *h_ptr);
+
+ /* ... to the left. */
+ for ( cx = *x_ptr - 1;
+ cx >= x && CheckSolidTile(cl, cx, *y_ptr, 1, *h_ptr, &colorValue, TRUE);
+ cx-- );
+ *w_ptr += *x_ptr - (cx + 1);
+ *x_ptr = cx + 1;
+
+ /* ... to the right. */
+ for ( cx = *x_ptr + *w_ptr;
+ cx < x + w &&
+ CheckSolidTile(cl, cx, *y_ptr, 1, *h_ptr, &colorValue, TRUE);
+ cx++ );
+ *w_ptr += cx - (*x_ptr + *w_ptr);
+}
+
+/*
+ * 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.
+ */
+
+static rfbBool CheckSolidTile(rfbClientPtr cl, int x, int y, int w, int h, uint32_t* colorPtr, rfbBool needSameColor)
+{
+ switch(cl->screen->rfbServerFormat.bitsPerPixel) {
+ case 32:
+ return CheckSolidTile32(cl, x, y, w, h, colorPtr, needSameColor);
+ case 16:
+ return CheckSolidTile16(cl, x, y, w, h, colorPtr, needSameColor);
+ default:
+ return CheckSolidTile8(cl, x, y, w, h, colorPtr, needSameColor);
+ }
+}
+
+#define DEFINE_CHECK_SOLID_FUNCTION(bpp) \
+ \
+static rfbBool \
+CheckSolidTile##bpp(rfbClientPtr cl, int x, int y, int w, int h, uint32_t* colorPtr, rfbBool needSameColor) \
+{ \
+ uint##bpp##_t *fbptr; \
+ uint##bpp##_t colorValue; \
+ int dx, dy; \
+ \
+ fbptr = (uint##bpp##_t *) \
+ &cl->screen->frameBuffer[y * cl->screen->paddedWidthInBytes + x * (bpp/8)]; \
+ \
+ colorValue = *fbptr; \
+ if (needSameColor && (uint32_t)colorValue != *colorPtr) \
+ return FALSE; \
+ \
+ for (dy = 0; dy < h; dy++) { \
+ for (dx = 0; dx < w; dx++) { \
+ if (colorValue != fbptr[dx]) \
+ return FALSE; \
+ } \
+ fbptr = (uint##bpp##_t *)((uint8_t *)fbptr + cl->screen->paddedWidthInBytes); \
+ } \
+ \
+ *colorPtr = (uint32_t)colorValue; \
+ return TRUE; \
+}
+
+DEFINE_CHECK_SOLID_FUNCTION(8)
+DEFINE_CHECK_SOLID_FUNCTION(16)
+DEFINE_CHECK_SOLID_FUNCTION(32)
+
+static rfbBool
+SendRectSimple(cl, x, y, w, h)
+ rfbClientPtr cl;
+ int x, y, w, h;
+{
+ int maxBeforeSize, maxAfterSize;
+ int maxRectSize, maxRectWidth;
+ int subrectMaxWidth, subrectMaxHeight;
+ int dx, dy;
+ int rw, rh;
+
+ maxRectSize = tightConf[compressLevel].maxRectSize;
+ maxRectWidth = tightConf[compressLevel].maxRectWidth;
+
+ maxBeforeSize = maxRectSize * (cl->format.bitsPerPixel / 8);
+ maxAfterSize = maxBeforeSize + (maxBeforeSize + 99) / 100 + 12;
+
+ if (tightBeforeBufSize < maxBeforeSize) {
+ tightBeforeBufSize = maxBeforeSize;
+ if (tightBeforeBuf == NULL)
+ tightBeforeBuf = (char *)malloc(tightBeforeBufSize);
+ else
+ tightBeforeBuf = (char *)realloc(tightBeforeBuf,
+ tightBeforeBufSize);
+ }
+
+ if (tightAfterBufSize < maxAfterSize) {
+ tightAfterBufSize = maxAfterSize;
+ if (tightAfterBuf == NULL)
+ tightAfterBuf = (char *)malloc(tightAfterBufSize);
+ else
+ tightAfterBuf = (char *)realloc(tightAfterBuf,
+ tightAfterBufSize);
+ }
+
+ if (w > maxRectWidth || w * h > maxRectSize) {
+ subrectMaxWidth = (w > maxRectWidth) ? maxRectWidth : w;
+ subrectMaxHeight = maxRectSize / subrectMaxWidth;
+
+ for (dy = 0; dy < h; dy += subrectMaxHeight) {
+ for (dx = 0; dx < w; dx += maxRectWidth) {
+ rw = (dx + maxRectWidth < w) ? maxRectWidth : w - dx;
+ rh = (dy + subrectMaxHeight < h) ? subrectMaxHeight : h - dy;
+ if (!SendSubrect(cl, x+dx, y+dy, rw, rh))
+ return FALSE;
+ }
+ }
+ } else {
+ if (!SendSubrect(cl, x, y, w, h))
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+static rfbBool
+SendSubrect(cl, x, y, w, h)
+ rfbClientPtr cl;
+ int x, y, w, h;
+{
+ char *fbptr;
+ rfbBool success = FALSE;
+
+ /* Send pending data if there is more than 128 bytes. */
+ if (cl->ublen > 128) {
+ if (!rfbSendUpdateBuf(cl))
+ return FALSE;
+ }
+
+ if (!SendTightHeader(cl, x, y, w, h))
+ return FALSE;
+
+ fbptr = (cl->screen->frameBuffer + (cl->screen->paddedWidthInBytes * y)
+ + (x * (cl->screen->bitsPerPixel / 8)));
+
+ (*cl->translateFn)(cl->translateLookupTable, &cl->screen->rfbServerFormat,
+ &cl->format, fbptr, tightBeforeBuf,
+ cl->screen->paddedWidthInBytes, w, h);
+
+ paletteMaxColors = w * h / tightConf[compressLevel].idxMaxColorsDivisor;
+ if ( paletteMaxColors < 2 &&
+ w * h >= tightConf[compressLevel].monoMinRectSize ) {
+ paletteMaxColors = 2;
+ }
+ switch (cl->format.bitsPerPixel) {
+ case 8:
+ FillPalette8(w * h);
+ break;
+ case 16:
+ FillPalette16(w * h);
+ break;
+ default:
+ FillPalette32(w * h);
+ }
+
+ switch (paletteNumColors) {
+ case 0:
+ /* Truecolor image */
+ if (DetectSmoothImage(cl, &cl->format, w, h)) {
+ if (qualityLevel != -1) {
+ success = SendJpegRect(cl, x, y, w, h,
+ tightConf[qualityLevel].jpegQuality);
+ } else {
+ success = SendGradientRect(cl, w, h);
+ }
+ } else {
+ success = SendFullColorRect(cl, w, h);
+ }
+ break;
+ case 1:
+ /* Solid rectangle */
+ success = SendSolidRect(cl);
+ break;
+ case 2:
+ /* Two-color rectangle */
+ success = SendMonoRect(cl, w, h);
+ break;
+ default:
+ /* Up to 256 different colors */
+ if ( paletteNumColors > 96 &&
+ qualityLevel != -1 && qualityLevel <= 3 &&
+ DetectSmoothImage(cl, &cl->format, w, h) ) {
+ success = SendJpegRect(cl, x, y, w, h,
+ tightConf[qualityLevel].jpegQuality);
+ } else {
+ success = SendIndexedRect(cl, w, h);
+ }
+ }
+ return success;
+}
+
+static rfbBool
+SendTightHeader(cl, x, y, w, h)
+ rfbClientPtr cl;
+ int x, y, w, h;
+{
+ rfbFramebufferUpdateRectHeader rect;
+
+ if (cl->ublen + sz_rfbFramebufferUpdateRectHeader > UPDATE_BUF_SIZE) {
+ if (!rfbSendUpdateBuf(cl))
+ return FALSE;
+ }
+
+ rect.r.x = Swap16IfLE(x);
+ rect.r.y = Swap16IfLE(y);
+ rect.r.w = Swap16IfLE(w);
+ rect.r.h = Swap16IfLE(h);
+ rect.encoding = Swap32IfLE(rfbEncodingTight);
+
+ memcpy(&cl->updateBuf[cl->ublen], (char *)&rect,
+ sz_rfbFramebufferUpdateRectHeader);
+ cl->ublen += sz_rfbFramebufferUpdateRectHeader;
+
+ cl->rfbRectanglesSent[rfbEncodingTight]++;
+ cl->rfbBytesSent[rfbEncodingTight] += sz_rfbFramebufferUpdateRectHeader;
+
+ return TRUE;
+}
+
+/*
+ * Subencoding implementations.
+ */
+
+static rfbBool
+SendSolidRect(cl)
+ rfbClientPtr cl;
+{
+ int len;
+
+ if (usePixelFormat24) {
+ Pack24(cl, tightBeforeBuf, &cl->format, 1);
+ len = 3;
+ } else
+ len = cl->format.bitsPerPixel / 8;
+
+ if (cl->ublen + 1 + len > UPDATE_BUF_SIZE) {
+ if (!rfbSendUpdateBuf(cl))
+ return FALSE;
+ }
+
+ cl->updateBuf[cl->ublen++] = (char)(rfbTightFill << 4);
+ memcpy (&cl->updateBuf[cl->ublen], tightBeforeBuf, len);
+ cl->ublen += len;
+
+ cl->rfbBytesSent[rfbEncodingTight] += len + 1;
+
+ return TRUE;
+}
+
+static rfbBool
+SendMonoRect(cl, w, h)
+ rfbClientPtr cl;
+ int w, h;
+{
+ int streamId = 1;
+ int paletteLen, dataLen;
+
+ if ( cl->ublen + TIGHT_MIN_TO_COMPRESS + 6 +
+ 2 * cl->format.bitsPerPixel / 8 > UPDATE_BUF_SIZE ) {
+ if (!rfbSendUpdateBuf(cl))
+ return FALSE;
+ }
+
+ /* Prepare tight encoding header. */
+ dataLen = (w + 7) / 8;
+ dataLen *= h;
+
+ cl->updateBuf[cl->ublen++] = (streamId | rfbTightExplicitFilter) << 4;
+ cl->updateBuf[cl->ublen++] = rfbTightFilterPalette;
+ cl->updateBuf[cl->ublen++] = 1;
+
+ /* Prepare palette, convert image. */
+ switch (cl->format.bitsPerPixel) {
+
+ case 32:
+ EncodeMonoRect32((uint8_t *)tightBeforeBuf, w, h);
+
+ ((uint32_t *)tightAfterBuf)[0] = monoBackground;
+ ((uint32_t *)tightAfterBuf)[1] = monoForeground;
+ if (usePixelFormat24) {
+ Pack24(cl, tightAfterBuf, &cl->format, 2);
+ paletteLen = 6;
+ } else
+ paletteLen = 8;
+
+ memcpy(&cl->updateBuf[cl->ublen], tightAfterBuf, paletteLen);
+ cl->ublen += paletteLen;
+ cl->rfbBytesSent[rfbEncodingTight] += 3 + paletteLen;
+ break;
+
+ case 16:
+ EncodeMonoRect16((uint8_t *)tightBeforeBuf, w, h);
+
+ ((uint16_t *)tightAfterBuf)[0] = (uint16_t)monoBackground;
+ ((uint16_t *)tightAfterBuf)[1] = (uint16_t)monoForeground;
+
+ memcpy(&cl->updateBuf[cl->ublen], tightAfterBuf, 4);
+ cl->ublen += 4;
+ cl->rfbBytesSent[rfbEncodingTight] += 7;
+ break;
+
+ default:
+ EncodeMonoRect8((uint8_t *)tightBeforeBuf, w, h);
+
+ cl->updateBuf[cl->ublen++] = (char)monoBackground;
+ cl->updateBuf[cl->ublen++] = (char)monoForeground;
+ cl->rfbBytesSent[rfbEncodingTight] += 5;
+ }
+
+ return CompressData(cl, streamId, dataLen,
+ tightConf[compressLevel].monoZlibLevel,
+ Z_DEFAULT_STRATEGY);
+}
+
+static rfbBool
+SendIndexedRect(cl, w, h)
+ rfbClientPtr cl;
+ int w, h;
+{
+ int streamId = 2;
+ int i, entryLen;
+
+ if ( cl->ublen + TIGHT_MIN_TO_COMPRESS + 6 +
+ paletteNumColors * cl->format.bitsPerPixel / 8 >
+ UPDATE_BUF_SIZE ) {
+ if (!rfbSendUpdateBuf(cl))
+ return FALSE;
+ }
+
+ /* Prepare tight encoding header. */
+ cl->updateBuf[cl->ublen++] = (streamId | rfbTightExplicitFilter) << 4;
+ cl->updateBuf[cl->ublen++] = rfbTightFilterPalette;
+ cl->updateBuf[cl->ublen++] = (char)(paletteNumColors - 1);
+
+ /* Prepare palette, convert image. */
+ switch (cl->format.bitsPerPixel) {
+
+ case 32:
+ EncodeIndexedRect32((uint8_t *)tightBeforeBuf, w * h);
+
+ for (i = 0; i < paletteNumColors; i++) {
+ ((uint32_t *)tightAfterBuf)[i] =
+ palette.entry[i].listNode->rgb;
+ }
+ if (usePixelFormat24) {
+ Pack24(cl, tightAfterBuf, &cl->format, paletteNumColors);
+ entryLen = 3;
+ } else
+ entryLen = 4;
+
+ memcpy(&cl->updateBuf[cl->ublen], tightAfterBuf, paletteNumColors * entryLen);
+ cl->ublen += paletteNumColors * entryLen;
+ cl->rfbBytesSent[rfbEncodingTight] += 3 + paletteNumColors * entryLen;
+ break;
+
+ case 16:
+ EncodeIndexedRect16((uint8_t *)tightBeforeBuf, w * h);
+
+ for (i = 0; i < paletteNumColors; i++) {
+ ((uint16_t *)tightAfterBuf)[i] =
+ (uint16_t)palette.entry[i].listNode->rgb;
+ }
+
+ memcpy(&cl->updateBuf[cl->ublen], tightAfterBuf, paletteNumColors * 2);
+ cl->ublen += paletteNumColors * 2;
+ cl->rfbBytesSent[rfbEncodingTight] += 3 + paletteNumColors * 2;
+ break;
+
+ default:
+ return FALSE; /* Should never happen. */
+ }
+
+ return CompressData(cl, streamId, w * h,
+ tightConf[compressLevel].idxZlibLevel,
+ Z_DEFAULT_STRATEGY);
+}
+
+static rfbBool
+SendFullColorRect(cl, w, h)
+ rfbClientPtr cl;
+ int w, h;
+{
+ int streamId = 0;
+ int len;
+
+ if (cl->ublen + TIGHT_MIN_TO_COMPRESS + 1 > UPDATE_BUF_SIZE) {
+ if (!rfbSendUpdateBuf(cl))
+ return FALSE;
+ }
+
+ cl->updateBuf[cl->ublen++] = 0x00; /* stream id = 0, no flushing, no filter */
+ cl->rfbBytesSent[rfbEncodingTight]++;
+
+ if (usePixelFormat24) {
+ Pack24(cl, tightBeforeBuf, &cl->format, w * h);
+ len = 3;
+ } else
+ len = cl->format.bitsPerPixel / 8;
+
+ return CompressData(cl, streamId, w * h * len,
+ tightConf[compressLevel].rawZlibLevel,
+ Z_DEFAULT_STRATEGY);
+}
+
+static rfbBool
+SendGradientRect(cl, w, h)
+ rfbClientPtr cl;
+ int w, h;
+{
+ int streamId = 3;
+ int len;
+
+ if (cl->format.bitsPerPixel == 8)
+ return SendFullColorRect(cl, w, h);
+
+ if (cl->ublen + TIGHT_MIN_TO_COMPRESS + 2 > UPDATE_BUF_SIZE) {
+ if (!rfbSendUpdateBuf(cl))
+ return FALSE;
+ }
+
+ if (prevRowBuf == NULL)
+ prevRowBuf = (int *)malloc(2048 * 3 * sizeof(int));
+
+ cl->updateBuf[cl->ublen++] = (streamId | rfbTightExplicitFilter) << 4;
+ cl->updateBuf[cl->ublen++] = rfbTightFilterGradient;
+ cl->rfbBytesSent[rfbEncodingTight] += 2;
+
+ if (usePixelFormat24) {
+ FilterGradient24(cl, tightBeforeBuf, &cl->format, w, h);
+ len = 3;
+ } else if (cl->format.bitsPerPixel == 32) {
+ FilterGradient32(cl, (uint32_t *)tightBeforeBuf, &cl->format, w, h);
+ len = 4;
+ } else {
+ FilterGradient16(cl, (uint16_t *)tightBeforeBuf, &cl->format, w, h);
+ len = 2;
+ }
+
+ return CompressData(cl, streamId, w * h * len,
+ tightConf[compressLevel].gradientZlibLevel,
+ Z_FILTERED);
+}
+
+static rfbBool
+CompressData(cl, streamId, dataLen, zlibLevel, zlibStrategy)
+ rfbClientPtr cl;
+ int streamId, dataLen, zlibLevel, zlibStrategy;
+{
+ z_streamp pz;
+ int err;
+
+ if (dataLen < TIGHT_MIN_TO_COMPRESS) {
+ memcpy(&cl->updateBuf[cl->ublen], tightBeforeBuf, dataLen);
+ cl->ublen += dataLen;
+ cl->rfbBytesSent[rfbEncodingTight] += dataLen;
+ return TRUE;
+ }
+
+ pz = &cl->zsStruct[streamId];
+
+ /* Initialize compression stream if needed. */
+ if (!cl->zsActive[streamId]) {
+ pz->zalloc = Z_NULL;
+ pz->zfree = Z_NULL;
+ pz->opaque = Z_NULL;
+
+ err = deflateInit2 (pz, zlibLevel, Z_DEFLATED, MAX_WBITS,
+ MAX_MEM_LEVEL, zlibStrategy);
+ if (err != Z_OK)
+ return FALSE;
+
+ cl->zsActive[streamId] = TRUE;
+ cl->zsLevel[streamId] = zlibLevel;
+ }
+
+ /* Prepare buffer pointers. */
+ pz->next_in = (Bytef *)tightBeforeBuf;
+ pz->avail_in = dataLen;
+ pz->next_out = (Bytef *)tightAfterBuf;
+ pz->avail_out = tightAfterBufSize;
+
+ /* Change compression parameters if needed. */
+ if (zlibLevel != cl->zsLevel[streamId]) {
+ if (deflateParams (pz, zlibLevel, zlibStrategy) != Z_OK) {
+ return FALSE;
+ }
+ cl->zsLevel[streamId] = zlibLevel;
+ }
+
+ /* Actual compression. */
+ if ( deflate (pz, Z_SYNC_FLUSH) != Z_OK ||
+ pz->avail_in != 0 || pz->avail_out == 0 ) {
+ return FALSE;
+ }
+
+ return SendCompressedData(cl, tightAfterBufSize - pz->avail_out);
+}
+
+static rfbBool SendCompressedData(cl, compressedLen)
+ rfbClientPtr cl;
+ int compressedLen;
+{
+ int i, portionLen;
+
+ cl->updateBuf[cl->ublen++] = compressedLen & 0x7F;
+ cl->rfbBytesSent[rfbEncodingTight]++;
+ if (compressedLen > 0x7F) {
+ cl->updateBuf[cl->ublen-1] |= 0x80;
+ cl->updateBuf[cl->ublen++] = compressedLen >> 7 & 0x7F;
+ cl->rfbBytesSent[rfbEncodingTight]++;
+ if (compressedLen > 0x3FFF) {
+ cl->updateBuf[cl->ublen-1] |= 0x80;
+ cl->updateBuf[cl->ublen++] = compressedLen >> 14 & 0xFF;
+ cl->rfbBytesSent[rfbEncodingTight]++;
+ }
+ }
+
+ portionLen = UPDATE_BUF_SIZE;
+ for (i = 0; i < compressedLen; i += portionLen) {
+ if (i + portionLen > compressedLen) {
+ portionLen = compressedLen - i;
+ }
+ if (cl->ublen + portionLen > UPDATE_BUF_SIZE) {
+ if (!rfbSendUpdateBuf(cl))
+ return FALSE;
+ }
+ memcpy(&cl->updateBuf[cl->ublen], &tightAfterBuf[i], portionLen);
+ cl->ublen += portionLen;
+ }
+ cl->rfbBytesSent[rfbEncodingTight] += compressedLen;
+
+ return TRUE;
+}
+
+/*
+ * Code to determine how many different colors used in rectangle.
+ */
+
+static void
+FillPalette8(count)
+ int count;
+{
+ uint8_t *data = (uint8_t *)tightBeforeBuf;
+ uint8_t c0, c1;
+ int i, n0, n1;
+
+ paletteNumColors = 0;
+
+ c0 = data[0];
+ for (i = 1; i < count && data[i] == c0; i++);
+ if (i == count) {
+ paletteNumColors = 1;
+ return; /* Solid rectangle */
+ }
+
+ if (paletteMaxColors < 2)
+ return;
+
+ n0 = i;
+ c1 = data[i];
+ n1 = 0;
+ for (i++; i < count; i++) {
+ if (data[i] == c0) {
+ n0++;
+ } else if (data[i] == c1) {
+ n1++;
+ } else
+ break;
+ }
+ if (i == count) {
+ if (n0 > n1) {
+ monoBackground = (uint32_t)c0;
+ monoForeground = (uint32_t)c1;
+ } else {
+ monoBackground = (uint32_t)c1;
+ monoForeground = (uint32_t)c0;
+ }
+ paletteNumColors = 2; /* Two colors */
+ }
+}
+
+#define DEFINE_FILL_PALETTE_FUNCTION(bpp) \
+ \
+static void \
+FillPalette##bpp(count) \
+ int count; \
+{ \
+ uint##bpp##_t *data = (uint##bpp##_t *)tightBeforeBuf; \
+ uint##bpp##_t c0, c1, ci; \
+ int i, n0, n1, ni; \
+ \
+ c0 = data[0]; \
+ for (i = 1; i < count && data[i] == c0; i++); \
+ if (i >= count) { \
+ paletteNumColors = 1; /* Solid rectangle */ \
+ return; \
+ } \
+ \
+ if (paletteMaxColors < 2) { \
+ paletteNumColors = 0; /* Full-color encoding preferred */ \
+ return; \
+ } \
+ \
+ 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) { \
+ monoBackground = (uint32_t)c0; \
+ monoForeground = (uint32_t)c1; \
+ } else { \
+ monoBackground = (uint32_t)c1; \
+ monoForeground = (uint32_t)c0; \
+ } \
+ paletteNumColors = 2; /* Two colors */ \
+ return; \
+ } \
+ \
+ PaletteReset(); \
+ PaletteInsert (c0, (uint32_t)n0, bpp); \
+ PaletteInsert (c1, (uint32_t)n1, bpp); \
+ \
+ ni = 1; \
+ for (i++; i < count; i++) { \
+ if (data[i] == ci) { \
+ ni++; \
+ } else { \
+ if (!PaletteInsert (ci, (uint32_t)ni, bpp)) \
+ return; \
+ ci = data[i]; \
+ ni = 1; \
+ } \
+ } \
+ PaletteInsert (ci, (uint32_t)ni, bpp); \
+}
+
+DEFINE_FILL_PALETTE_FUNCTION(16)
+DEFINE_FILL_PALETTE_FUNCTION(32)
+
+
+/*
+ * Functions to operate with palette structures.
+ */
+
+#define HASH_FUNC16(rgb) ((int)(((rgb >> 8) + rgb) & 0xFF))
+#define HASH_FUNC32(rgb) ((int)(((rgb >> 16) + (rgb >> 8)) & 0xFF))
+
+static void
+PaletteReset(void)
+{
+ paletteNumColors = 0;
+ memset(palette.hash, 0, 256 * sizeof(COLOR_LIST *));
+}
+
+static int
+PaletteInsert(rgb, numPixels, bpp)
+ uint32_t rgb;
+ int numPixels;
+ int bpp;
+{
+ COLOR_LIST *pnode;
+ COLOR_LIST *prev_pnode = NULL;
+ int hash_key, idx, new_idx, count;
+
+ hash_key = (bpp == 16) ? HASH_FUNC16(rgb) : HASH_FUNC32(rgb);
+
+ pnode = palette.hash[hash_key];
+
+ while (pnode != NULL) {
+ if (pnode->rgb == rgb) {
+ /* Such palette entry already exists. */
+ new_idx = idx = pnode->idx;
+ count = palette.entry[idx].numPixels + numPixels;
+ if (new_idx && palette.entry[new_idx-1].numPixels < count) {
+ do {
+ palette.entry[new_idx] = palette.entry[new_idx-1];
+ palette.entry[new_idx].listNode->idx = new_idx;
+ new_idx--;
+ }
+ while (new_idx && palette.entry[new_idx-1].numPixels < count);
+ palette.entry[new_idx].listNode = pnode;
+ pnode->idx = new_idx;
+ }
+ palette.entry[new_idx].numPixels = count;
+ return paletteNumColors;
+ }
+ prev_pnode = pnode;
+ pnode = pnode->next;
+ }
+
+ /* Check if palette is full. */
+ if (paletteNumColors == 256 || paletteNumColors == paletteMaxColors) {
+ paletteNumColors = 0;
+ return 0;
+ }
+
+ /* Move palette entries with lesser pixel counts. */
+ for ( idx = paletteNumColors;
+ idx > 0 && palette.entry[idx-1].numPixels < numPixels;
+ idx-- ) {
+ palette.entry[idx] = palette.entry[idx-1];
+ palette.entry[idx].listNode->idx = idx;
+ }
+
+ /* Add new palette entry into the freed slot. */
+ pnode = &palette.list[paletteNumColors];
+ if (prev_pnode != NULL) {
+ prev_pnode->next = pnode;
+ } else {
+ palette.hash[hash_key] = pnode;
+ }
+ pnode->next = NULL;
+ pnode->idx = idx;
+ pnode->rgb = rgb;
+ palette.entry[idx].listNode = pnode;
+ palette.entry[idx].numPixels = numPixels;
+
+ return (++paletteNumColors);
+}
+
+
+/*
+ * Converting 32-bit color samples into 24-bit colors.
+ * Should be called only when redMax, greenMax and blueMax are 255.
+ * Color components assumed to be byte-aligned.
+ */
+
+static void Pack24(cl, buf, fmt, count)
+ rfbClientPtr cl;
+ char *buf;
+ rfbPixelFormat *fmt;
+ int count;
+{
+ uint32_t *buf32;
+ uint32_t pix;
+ int r_shift, g_shift, b_shift;
+
+ buf32 = (uint32_t *)buf;
+
+ if (!cl->screen->rfbServerFormat.bigEndian == !fmt->bigEndian) {
+ r_shift = fmt->redShift;
+ g_shift = fmt->greenShift;
+ b_shift = fmt->blueShift;
+ } else {
+ r_shift = 24 - fmt->redShift;
+ g_shift = 24 - fmt->greenShift;
+ b_shift = 24 - fmt->blueShift;
+ }
+
+ while (count--) {
+ pix = *buf32++;
+ *buf++ = (char)(pix >> r_shift);
+ *buf++ = (char)(pix >> g_shift);
+ *buf++ = (char)(pix >> b_shift);
+ }
+}
+
+
+/*
+ * Converting truecolor samples into palette indices.
+ */
+
+#define DEFINE_IDX_ENCODE_FUNCTION(bpp) \
+ \
+static void \
+EncodeIndexedRect##bpp(buf, count) \
+ uint8_t *buf; \
+ int count; \
+{ \
+ COLOR_LIST *pnode; \
+ uint##bpp##_t *src; \
+ uint##bpp##_t rgb; \
+ int rep = 0; \
+ \
+ src = (uint##bpp##_t *) buf; \
+ \
+ while (count--) { \
+ rgb = *src++; \
+ while (count && *src == rgb) { \
+ rep++, src++, count--; \
+ } \
+ pnode = palette.hash[HASH_FUNC##bpp(rgb)]; \
+ while (pnode != NULL) { \
+ if ((uint##bpp##_t)pnode->rgb == rgb) { \
+ *buf++ = (uint8_t)pnode->idx; \
+ while (rep) { \
+ *buf++ = (uint8_t)pnode->idx; \
+ rep--; \
+ } \
+ break; \
+ } \
+ pnode = pnode->next; \
+ } \
+ } \
+}
+
+DEFINE_IDX_ENCODE_FUNCTION(16)
+DEFINE_IDX_ENCODE_FUNCTION(32)
+
+#define DEFINE_MONO_ENCODE_FUNCTION(bpp) \
+ \
+static void \
+EncodeMonoRect##bpp(buf, w, h) \
+ uint8_t *buf; \
+ int w, h; \
+{ \
+ uint##bpp##_t *ptr; \
+ uint##bpp##_t bg; \
+ unsigned int value, mask; \
+ int aligned_width; \
+ int x, y, bg_bits; \
+ \
+ ptr = (uint##bpp##_t *) buf; \
+ bg = (uint##bpp##_t) monoBackground; \
+ 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
+FilterGradient24(cl, buf, fmt, w, h)
+ rfbClientPtr cl;
+ char *buf;
+ rfbPixelFormat *fmt;
+ int w, h;
+{
+ uint32_t *buf32;
+ uint32_t pix32;
+ int *prevRowPtr;
+ int shiftBits[3];
+ int pixHere[3], pixUpper[3], pixLeft[3], pixUpperLeft[3];
+ int prediction;
+ int x, y, c;
+
+ buf32 = (uint32_t *)buf;
+ memset (prevRowBuf, 0, w * 3 * sizeof(int));
+
+ if (!cl->screen->rfbServerFormat.bigEndian == !fmt->bigEndian) {
+ shiftBits[0] = fmt->redShift;
+ shiftBits[1] = fmt->greenShift;
+ shiftBits[2] = fmt->blueShift;
+ } else {
+ shiftBits[0] = 24 - fmt->redShift;
+ shiftBits[1] = 24 - fmt->greenShift;
+ shiftBits[2] = 24 - fmt->blueShift;
+ }
+
+ for (y = 0; y < h; y++) {
+ for (c = 0; c < 3; c++) {
+ pixUpper[c] = 0;
+ pixHere[c] = 0;
+ }
+ prevRowPtr = prevRowBuf;
+ for (x = 0; x < w; x++) {
+ pix32 = *buf32++;
+ for (c = 0; c < 3; c++) {
+ pixUpperLeft[c] = pixUpper[c];
+ pixLeft[c] = pixHere[c];
+ pixUpper[c] = *prevRowPtr;
+ pixHere[c] = (int)(pix32 >> shiftBits[c] & 0xFF);
+ *prevRowPtr++ = pixHere[c];
+
+ prediction = pixLeft[c] + pixUpper[c] - pixUpperLeft[c];
+ if (prediction < 0) {
+ prediction = 0;
+ } else if (prediction > 0xFF) {
+ prediction = 0xFF;
+ }
+ *buf++ = (char)(pixHere[c] - prediction);
+ }
+ }
+ }
+}
+
+
+/*
+ * ``Gradient'' filter for other color depths.
+ */
+
+#define DEFINE_GRADIENT_FILTER_FUNCTION(bpp) \
+ \
+static void \
+FilterGradient##bpp(cl, buf, fmt, w, h) \
+ rfbClientPtr cl; \
+ uint##bpp##_t *buf; \
+ rfbPixelFormat *fmt; \
+ int w, h; \
+{ \
+ uint##bpp##_t pix, diff; \
+ rfbBool endianMismatch; \
+ int *prevRowPtr; \
+ int maxColor[3], shiftBits[3]; \
+ int pixHere[3], pixUpper[3], pixLeft[3], pixUpperLeft[3]; \
+ int prediction; \
+ int x, y, c; \
+ \
+ memset (prevRowBuf, 0, w * 3 * sizeof(int)); \
+ \
+ endianMismatch = (!cl->screen->rfbServerFormat.bigEndian != !fmt->bigEndian); \
+ \
+ maxColor[0] = fmt->redMax; \
+ maxColor[1] = fmt->greenMax; \
+ maxColor[2] = fmt->blueMax; \
+ shiftBits[0] = fmt->redShift; \
+ shiftBits[1] = fmt->greenShift; \
+ shiftBits[2] = fmt->blueShift; \
+ \
+ for (y = 0; y < h; y++) { \
+ for (c = 0; c < 3; c++) { \
+ pixUpper[c] = 0; \
+ pixHere[c] = 0; \
+ } \
+ prevRowPtr = prevRowBuf; \
+ for (x = 0; x < w; x++) { \
+ pix = *buf; \
+ if (endianMismatch) { \
+ pix = Swap##bpp(pix); \
+ } \
+ diff = 0; \
+ for (c = 0; c < 3; c++) { \
+ pixUpperLeft[c] = pixUpper[c]; \
+ pixLeft[c] = pixHere[c]; \
+ pixUpper[c] = *prevRowPtr; \
+ pixHere[c] = (int)(pix >> shiftBits[c] & maxColor[c]); \
+ *prevRowPtr++ = pixHere[c]; \
+ \
+ prediction = pixLeft[c] + pixUpper[c] - pixUpperLeft[c]; \
+ if (prediction < 0) { \
+ prediction = 0; \
+ } else if (prediction > maxColor[c]) { \
+ prediction = maxColor[c]; \
+ } \
+ diff |= ((pixHere[c] - prediction) & maxColor[c]) \
+ << shiftBits[c]; \
+ } \
+ if (endianMismatch) { \
+ diff = Swap##bpp(diff); \
+ } \
+ *buf++ = diff; \
+ } \
+ } \
+}
+
+DEFINE_GRADIENT_FILTER_FUNCTION(16)
+DEFINE_GRADIENT_FILTER_FUNCTION(32)
+
+
+/*
+ * Code to guess if given rectangle is suitable for smooth image
+ * compression (by applying "gradient" filter or JPEG coder).
+ */
+
+#define JPEG_MIN_RECT_SIZE 4096
+
+#define DETECT_SUBROW_WIDTH 7
+#define DETECT_MIN_WIDTH 8
+#define DETECT_MIN_HEIGHT 8
+
+static int
+DetectSmoothImage (cl, fmt, w, h)
+ rfbClientPtr cl;
+ rfbPixelFormat *fmt;
+ int w, h;
+{
+ long avgError;
+
+ if ( cl->screen->rfbServerFormat.bitsPerPixel == 8 || fmt->bitsPerPixel == 8 ||
+ w < DETECT_MIN_WIDTH || h < DETECT_MIN_HEIGHT ) {
+ return 0;
+ }
+
+ if (qualityLevel != -1) {
+ if (w * h < JPEG_MIN_RECT_SIZE) {
+ return 0;
+ }
+ } else {
+ if ( rfbTightDisableGradient ||
+ w * h < tightConf[compressLevel].gradientMinRectSize ) {
+ return 0;
+ }
+ }
+
+ if (fmt->bitsPerPixel == 32) {
+ if (usePixelFormat24) {
+ avgError = DetectSmoothImage24(cl, fmt, w, h);
+ if (qualityLevel != -1) {
+ return (avgError < tightConf[qualityLevel].jpegThreshold24);
+ }
+ return (avgError < tightConf[compressLevel].gradientThreshold24);
+ } else {
+ avgError = DetectSmoothImage32(cl, fmt, w, h);
+ }
+ } else {
+ avgError = DetectSmoothImage16(cl, fmt, w, h);
+ }
+ if (qualityLevel != -1) {
+ return (avgError < tightConf[qualityLevel].jpegThreshold);
+ }
+ return (avgError < tightConf[compressLevel].gradientThreshold);
+}
+
+static unsigned long
+DetectSmoothImage24 (cl, fmt, w, h)
+ rfbClientPtr cl;
+ rfbPixelFormat *fmt;
+ int w, h;
+{
+ int off;
+ int x, y, d, dx, c;
+ int diffStat[256];
+ int pixelCount = 0;
+ int pix, left[3];
+ unsigned long avgError;
+
+ /* If client is big-endian, color samples begin from the second
+ byte (offset 1) of a 32-bit pixel value. */
+ off = (fmt->bigEndian != 0);
+
+ memset(diffStat, 0, 256*sizeof(int));
+
+ y = 0, x = 0;
+ while (y < h && x < w) {
+ for (d = 0; d < h - y && d < w - x - DETECT_SUBROW_WIDTH; d++) {
+ for (c = 0; c < 3; c++) {
+ left[c] = (int)tightBeforeBuf[((y+d)*w+x+d)*4+off+c] & 0xFF;
+ }
+ for (dx = 1; dx <= DETECT_SUBROW_WIDTH; dx++) {
+ for (c = 0; c < 3; c++) {
+ pix = (int)tightBeforeBuf[((y+d)*w+x+d+dx)*4+off+c] & 0xFF;
+ diffStat[abs(pix - left[c])]++;
+ left[c] = pix;
+ }
+ pixelCount++;
+ }
+ }
+ if (w > h) {
+ x += h;
+ y = 0;
+ } else {
+ x = 0;
+ y += w;
+ }
+ }
+
+ if (diffStat[0] * 33 / pixelCount >= 95)
+ return 0;
+
+ avgError = 0;
+ for (c = 1; c < 8; c++) {
+ avgError += (unsigned long)diffStat[c] * (unsigned long)(c * c);
+ if (diffStat[c] == 0 || diffStat[c] > diffStat[c-1] * 2)
+ return 0;
+ }
+ for (; c < 256; c++) {
+ avgError += (unsigned long)diffStat[c] * (unsigned long)(c * c);
+ }
+ avgError /= (pixelCount * 3 - diffStat[0]);
+
+ return avgError;
+}
+
+#define DEFINE_DETECT_FUNCTION(bpp) \
+ \
+static unsigned long \
+DetectSmoothImage##bpp (cl, fmt, w, h) \
+ rfbClientPtr cl; \
+ rfbPixelFormat *fmt; \
+ int w, h; \
+{ \
+ rfbBool endianMismatch; \
+ uint##bpp##_t pix; \
+ int maxColor[3], shiftBits[3]; \
+ int x, y, d, dx, c; \
+ int diffStat[256]; \
+ int pixelCount = 0; \
+ int sample, sum, left[3]; \
+ unsigned long avgError; \
+ \
+ endianMismatch = (!cl->screen->rfbServerFormat.bigEndian != !fmt->bigEndian); \
+ \
+ maxColor[0] = fmt->redMax; \
+ maxColor[1] = fmt->greenMax; \
+ maxColor[2] = fmt->blueMax; \
+ shiftBits[0] = fmt->redShift; \
+ shiftBits[1] = fmt->greenShift; \
+ shiftBits[2] = fmt->blueShift; \
+ \
+ memset(diffStat, 0, 256*sizeof(int)); \
+ \
+ y = 0, x = 0; \
+ while (y < h && x < w) { \
+ for (d = 0; d < h - y && d < w - x - DETECT_SUBROW_WIDTH; d++) { \
+ pix = ((uint##bpp##_t *)tightBeforeBuf)[(y+d)*w+x+d]; \
+ if (endianMismatch) { \
+ pix = Swap##bpp(pix); \
+ } \
+ for (c = 0; c < 3; c++) { \
+ left[c] = (int)(pix >> shiftBits[c] & maxColor[c]); \
+ } \
+ for (dx = 1; dx <= DETECT_SUBROW_WIDTH; dx++) { \
+ pix = ((uint##bpp##_t *)tightBeforeBuf)[(y+d)*w+x+d+dx]; \
+ if (endianMismatch) { \
+ pix = Swap##bpp(pix); \
+ } \
+ sum = 0; \
+ for (c = 0; c < 3; c++) { \
+ sample = (int)(pix >> shiftBits[c] & maxColor[c]); \
+ sum += abs(sample - left[c]); \
+ left[c] = sample; \
+ } \
+ if (sum > 255) \
+ sum = 255; \
+ diffStat[sum]++; \
+ pixelCount++; \
+ } \
+ } \
+ if (w > h) { \
+ x += h; \
+ y = 0; \
+ } else { \
+ x = 0; \
+ y += w; \
+ } \
+ } \
+ \
+ if ((diffStat[0] + diffStat[1]) * 100 / pixelCount >= 90) \
+ return 0; \
+ \
+ avgError = 0; \
+ for (c = 1; c < 8; c++) { \
+ avgError += (unsigned long)diffStat[c] * (unsigned long)(c * c); \
+ if (diffStat[c] == 0 || diffStat[c] > diffStat[c-1] * 2) \
+ return 0; \
+ } \
+ for (; c < 256; c++) { \
+ avgError += (unsigned long)diffStat[c] * (unsigned long)(c * c); \
+ } \
+ avgError /= (pixelCount - diffStat[0]); \
+ \
+ return avgError; \
+}
+
+DEFINE_DETECT_FUNCTION(16)
+DEFINE_DETECT_FUNCTION(32)
+
+
+/*
+ * JPEG compression stuff.
+ */
+
+static struct jpeg_destination_mgr jpegDstManager;
+static rfbBool jpegError;
+static int jpegDstDataLen;
+
+static rfbBool
+SendJpegRect(cl, x, y, w, h, quality)
+ rfbClientPtr cl;
+ int x, y, w, h;
+ int quality;
+{
+ struct jpeg_compress_struct cinfo;
+ struct jpeg_error_mgr jerr;
+ uint8_t *srcBuf;
+ JSAMPROW rowPointer[1];
+ int dy;
+
+ if (cl->screen->rfbServerFormat.bitsPerPixel == 8)
+ return SendFullColorRect(cl, w, h);
+
+ srcBuf = (uint8_t *)malloc(w * 3);
+ if (srcBuf == NULL) {
+ return SendFullColorRect(cl, w, h);
+ }
+ rowPointer[0] = srcBuf;
+
+ cinfo.err = jpeg_std_error(&jerr);
+ jpeg_create_compress(&cinfo);
+
+ 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);
+
+ JpegSetDstManager (&cinfo);
+
+ jpeg_start_compress(&cinfo, TRUE);
+
+ for (dy = 0; dy < h; dy++) {
+ PrepareRowForJpeg(cl, srcBuf, x, y + dy, w);
+ jpeg_write_scanlines(&cinfo, rowPointer, 1);
+ if (jpegError)
+ break;
+ }
+
+ if (!jpegError)
+ jpeg_finish_compress(&cinfo);
+
+ jpeg_destroy_compress(&cinfo);
+ free(srcBuf);
+
+ if (jpegError)
+ return SendFullColorRect(cl, w, h);
+
+ if (cl->ublen + TIGHT_MIN_TO_COMPRESS + 1 > UPDATE_BUF_SIZE) {
+ if (!rfbSendUpdateBuf(cl))
+ return FALSE;
+ }
+
+ cl->updateBuf[cl->ublen++] = (char)(rfbTightJpeg << 4);
+ cl->rfbBytesSent[rfbEncodingTight]++;
+
+ return SendCompressedData(cl, jpegDstDataLen);
+}
+
+static void
+PrepareRowForJpeg(cl, dst, x, y, count)
+ rfbClientPtr cl;
+ uint8_t *dst;
+ int x, y, count;
+{
+ if (cl->screen->rfbServerFormat.bitsPerPixel == 32) {
+ if ( cl->screen->rfbServerFormat.redMax == 0xFF &&
+ cl->screen->rfbServerFormat.greenMax == 0xFF &&
+ cl->screen->rfbServerFormat.blueMax == 0xFF ) {
+ PrepareRowForJpeg24(cl, dst, x, y, count);
+ } else {
+ PrepareRowForJpeg32(cl, dst, x, y, count);
+ }
+ } else {
+ /* 16 bpp assumed. */
+ PrepareRowForJpeg16(cl, dst, x, y, count);
+ }
+}
+
+static void
+PrepareRowForJpeg24(cl, dst, x, y, count)
+ rfbClientPtr cl;
+ uint8_t *dst;
+ int x, y, count;
+{
+ uint32_t *fbptr;
+ uint32_t pix;
+
+ fbptr = (uint32_t *)
+ &cl->screen->frameBuffer[y * cl->screen->paddedWidthInBytes + x * 4];
+
+ while (count--) {
+ pix = *fbptr++;
+ *dst++ = (uint8_t)(pix >> cl->screen->rfbServerFormat.redShift);
+ *dst++ = (uint8_t)(pix >> cl->screen->rfbServerFormat.greenShift);
+ *dst++ = (uint8_t)(pix >> cl->screen->rfbServerFormat.blueShift);
+ }
+}
+
+#define DEFINE_JPEG_GET_ROW_FUNCTION(bpp) \
+ \
+static void \
+PrepareRowForJpeg##bpp(cl, dst, x, y, count) \
+ rfbClientPtr cl; \
+ uint8_t *dst; \
+ int x, y, count; \
+{ \
+ uint##bpp##_t *fbptr; \
+ uint##bpp##_t pix; \
+ int inRed, inGreen, inBlue; \
+ \
+ fbptr = (uint##bpp##_t *) \
+ &cl->screen->frameBuffer[y * cl->screen->paddedWidthInBytes + \
+ x * (bpp / 8)]; \
+ \
+ while (count--) { \
+ pix = *fbptr++; \
+ \
+ inRed = (int) \
+ (pix >> cl->screen->rfbServerFormat.redShift & cl->screen->rfbServerFormat.redMax); \
+ inGreen = (int) \
+ (pix >> cl->screen->rfbServerFormat.greenShift & cl->screen->rfbServerFormat.greenMax); \
+ inBlue = (int) \
+ (pix >> cl->screen->rfbServerFormat.blueShift & cl->screen->rfbServerFormat.blueMax); \
+ \
+ *dst++ = (uint8_t)((inRed * 255 + cl->screen->rfbServerFormat.redMax / 2) / \
+ cl->screen->rfbServerFormat.redMax); \
+ *dst++ = (uint8_t)((inGreen * 255 + cl->screen->rfbServerFormat.greenMax / 2) / \
+ cl->screen->rfbServerFormat.greenMax); \
+ *dst++ = (uint8_t)((inBlue * 255 + cl->screen->rfbServerFormat.blueMax / 2) / \
+ cl->screen->rfbServerFormat.blueMax); \
+ } \
+}
+
+DEFINE_JPEG_GET_ROW_FUNCTION(16)
+DEFINE_JPEG_GET_ROW_FUNCTION(32)
+
+/*
+ * Destination manager implementation for JPEG library.
+ */
+
+static void
+JpegInitDestination(j_compress_ptr cinfo)
+{
+ jpegError = FALSE;
+ jpegDstManager.next_output_byte = (JOCTET *)tightAfterBuf;
+ jpegDstManager.free_in_buffer = (size_t)tightAfterBufSize;
+}
+
+static boolean
+JpegEmptyOutputBuffer(j_compress_ptr cinfo)
+{
+ jpegError = TRUE;
+ jpegDstManager.next_output_byte = (JOCTET *)tightAfterBuf;
+ jpegDstManager.free_in_buffer = (size_t)tightAfterBufSize;
+
+ return TRUE;
+}
+
+static void
+JpegTermDestination(j_compress_ptr cinfo)
+{
+ jpegDstDataLen = tightAfterBufSize - jpegDstManager.free_in_buffer;
+}
+
+static void
+JpegSetDstManager(j_compress_ptr cinfo)
+{
+ jpegDstManager.init_destination = JpegInitDestination;
+ jpegDstManager.empty_output_buffer = JpegEmptyOutputBuffer;
+ jpegDstManager.term_destination = JpegTermDestination;
+ cinfo->dest = &jpegDstManager;
+}
+
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-15 08:31:13 +0000