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tight-1.3.9.c
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tight-1.3.9.c
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/*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "rfb.h"
#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. */
Bool rfbTightDisableGradient = FALSE;
/* This variable is set on every rfbSendRectEncodingTight() call. */
static Bool usePixelFormat24;
static int enableLastRectEncoding = 1;
/* 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 = 9;
static int qualityLevel = -1;
/* Stuff dealing with palettes. */
typedef struct COLOR_LIST_s {
struct COLOR_LIST_s *next;
int idx;
CARD32 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 CARD32 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;
/* Prototypes for static functions. */
static void FindBestSolidArea (int x, int y, int w, int h,
CARD32 colorValue, int *w_ptr, int *h_ptr);
static void ExtendSolidArea (int x, int y, int w, int h,
CARD32 colorValue,
int *x_ptr, int *y_ptr, int *w_ptr, int *h_ptr);
static Bool CheckSolidTile (int x, int y, int w, int h,
CARD32 *colorPtr, Bool needSameColor);
static Bool CheckSolidTile8 (int x, int y, int w, int h,
CARD32 *colorPtr, Bool needSameColor);
static Bool CheckSolidTile16 (int x, int y, int w, int h,
CARD32 *colorPtr, Bool needSameColor);
static Bool CheckSolidTile32 (int x, int y, int w, int h,
CARD32 *colorPtr, Bool needSameColor);
static Bool SendRectSimple (rfbClientPtr cl, int x, int y, int w, int h);
static Bool SendSubrect (rfbClientPtr cl, int x, int y, int w, int h);
static Bool SendTightHeader (rfbClientPtr cl, int x, int y, int w, int h);
static Bool SendSolidRect (rfbClientPtr cl);
static Bool SendMonoRect (rfbClientPtr cl, int w, int h);
static Bool SendIndexedRect (rfbClientPtr cl, int w, int h);
static Bool SendFullColorRect (rfbClientPtr cl, int w, int h);
static Bool SendGradientRect (rfbClientPtr cl, int w, int h);
static Bool CompressData(rfbClientPtr cl, int streamId, int dataLen,
int zlibLevel, int zlibStrategy);
static Bool 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(CARD32 rgb, int numPixels, int bpp);
static void Pack24(char *buf, rfbPixelFormat *fmt, int count);
static void EncodeIndexedRect16(CARD8 *buf, int count);
static void EncodeIndexedRect32(CARD8 *buf, int count);
static void EncodeMonoRect8(CARD8 *buf, int w, int h);
static void EncodeMonoRect16(CARD8 *buf, int w, int h);
static void EncodeMonoRect32(CARD8 *buf, int w, int h);
static void FilterGradient24(char *buf, rfbPixelFormat *fmt, int w, int h);
static void FilterGradient16(CARD16 *buf, rfbPixelFormat *fmt, int w, int h);
static void FilterGradient32(CARD32 *buf, rfbPixelFormat *fmt, int w, int h);
static int DetectSmoothImage(rfbPixelFormat *fmt, int w, int h);
static unsigned long DetectSmoothImage24(rfbPixelFormat *fmt, int w, int h);
static unsigned long DetectSmoothImage16(rfbPixelFormat *fmt, int w, int h);
static unsigned long DetectSmoothImage32(rfbPixelFormat *fmt, int w, int h);
static Bool SendJpegRect(rfbClientPtr cl, int x, int y, int w, int h,
int quality);
static void PrepareRowForJpeg(CARD8 *dst, int x, int y, int count);
static void PrepareRowForJpeg24(CARD8 *dst, int x, int y, int count);
static void PrepareRowForJpeg16(CARD8 *dst, int x, int y, int count);
static void PrepareRowForJpeg32(CARD8 *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);
unsigned long solidrect=0, solidpixels=0, monorect=0, monopixels=0, ndxrect=0,
ndxpixels=0, jpegrect=0, jpegpixels=0, fcrect=0, fcpixels=0, gradrect=0,
gradpixels=0;
/*
* 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 (enableLastRectEncoding && w * h >= MIN_SPLIT_RECT_SIZE)
return 0;
maxRectSize = tightConf[compressLevel].maxRectSize;
maxRectWidth = tightConf[compressLevel].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;
}
}
Bool
rfbSendRectEncodingTight(cl, x, y, w, h)
rfbClientPtr cl;
int x, y, w, h;
{
int nMaxRows;
CARD32 colorValue;
int dx, dy, dw, dh;
int x_best, y_best, w_best, h_best;
char *fbptr;
if ( cl->format.depth == 24 && cl->format.redMax == 0xFF &&
cl->format.greenMax == 0xFF && cl->format.blueMax == 0xFF ) {
usePixelFormat24 = TRUE;
} else {
usePixelFormat24 = FALSE;
}
if (!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 *)xalloc(tightBeforeBufSize);
else
tightBeforeBuf = (char *)xrealloc(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(dx, dy, dw, dh, &colorValue, FALSE)) {
/* Get dimensions of solid-color area. */
FindBestSolidArea(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(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 = (rfbScreen.pfbMemory +
(rfbScreen.paddedWidthInBytes * y_best) +
(x_best * (rfbScreen.bitsPerPixel / 8)));
(*cl->translateFn)(cl->translateLookupTable, &rfbServerFormat,
&cl->format, fbptr, tightBeforeBuf,
rfbScreen.paddedWidthInBytes, 1, 1);
solidrect++; solidpixels+=w_best*h_best;
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(x, y, w, h, colorValue, w_ptr, h_ptr)
int x, y, w, h;
CARD32 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(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(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(x, y, w, h, colorValue, x_ptr, y_ptr, w_ptr, h_ptr)
int x, y, w, h;
CARD32 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(*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(*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(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(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 Bool
CheckSolidTile(x, y, w, h, colorPtr, needSameColor)
int x, y, w, h;
CARD32 *colorPtr;
Bool needSameColor;
{
switch(rfbServerFormat.bitsPerPixel) {
case 32:
return CheckSolidTile32(x, y, w, h, colorPtr, needSameColor);
case 16:
return CheckSolidTile16(x, y, w, h, colorPtr, needSameColor);
default:
return CheckSolidTile8(x, y, w, h, colorPtr, needSameColor);
}
}
#define DEFINE_CHECK_SOLID_FUNCTION(bpp) \
\
static Bool \
CheckSolidTile##bpp(x, y, w, h, colorPtr, needSameColor) \
int x, y; \
CARD32 *colorPtr; \
Bool needSameColor; \
{ \
CARD##bpp *fbptr; \
CARD##bpp colorValue; \
int dx, dy; \
\
fbptr = (CARD##bpp *) \
&rfbScreen.pfbMemory[y * rfbScreen.paddedWidthInBytes + x * (bpp/8)]; \
\
colorValue = *fbptr; \
if (needSameColor && (CARD32)colorValue != *colorPtr) \
return FALSE; \
\
for (dy = 0; dy < h; dy++) { \
for (dx = 0; dx < w; dx++) { \
if (colorValue != fbptr[dx]) \
return FALSE; \
} \
fbptr = (CARD##bpp *)((CARD8 *)fbptr + rfbScreen.paddedWidthInBytes); \
} \
\
*colorPtr = (CARD32)colorValue; \
return TRUE; \
}
DEFINE_CHECK_SOLID_FUNCTION(8)
DEFINE_CHECK_SOLID_FUNCTION(16)
DEFINE_CHECK_SOLID_FUNCTION(32)
static Bool
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 *)xalloc(tightBeforeBufSize);
else
tightBeforeBuf = (char *)xrealloc(tightBeforeBuf,
tightBeforeBufSize);
}
if (tightAfterBufSize < maxAfterSize) {
tightAfterBufSize = maxAfterSize;
if (tightAfterBuf == NULL)
tightAfterBuf = (char *)xalloc(tightAfterBufSize);
else
tightAfterBuf = (char *)xrealloc(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 Bool
SendSubrect(cl, x, y, w, h)
rfbClientPtr cl;
int x, y, w, h;
{
char *fbptr;
Bool success = FALSE;
/* Send pending data if there is more than 128 bytes. */
if (ublen > 128) {
if (!rfbSendUpdateBuf(cl))
return FALSE;
}
if (!SendTightHeader(cl, x, y, w, h))
return FALSE;
fbptr = (rfbScreen.pfbMemory + (rfbScreen.paddedWidthInBytes * y)
+ (x * (rfbScreen.bitsPerPixel / 8)));
(*cl->translateFn)(cl->translateLookupTable, &rfbServerFormat,
&cl->format, fbptr, tightBeforeBuf,
rfbScreen.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->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 */
solidrect++; solidpixels+=w*h;
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->format, w, h) ) {
success = SendJpegRect(cl, x, y, w, h,
tightConf[qualityLevel].jpegQuality);
} else {
success = SendIndexedRect(cl, w, h);
}
}
return success;
}
static Bool
SendTightHeader(cl, x, y, w, h)
rfbClientPtr cl;
int x, y, w, h;
{
rfbFramebufferUpdateRectHeader rect;
if (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(&updateBuf[ublen], (char *)&rect,
sz_rfbFramebufferUpdateRectHeader);
ublen += sz_rfbFramebufferUpdateRectHeader;
cl->rfbRectanglesSent[rfbEncodingTight]++;
cl->rfbBytesSent[rfbEncodingTight] += sz_rfbFramebufferUpdateRectHeader;
return TRUE;
}
/*
* Subencoding implementations.
*/
static Bool
SendSolidRect(cl)
rfbClientPtr cl;
{
int len;
if (usePixelFormat24) {
Pack24(tightBeforeBuf, &cl->format, 1);
len = 3;
} else
len = cl->format.bitsPerPixel / 8;
if (ublen + 1 + len > UPDATE_BUF_SIZE) {
if (!rfbSendUpdateBuf(cl))
return FALSE;
}
updateBuf[ublen++] = (char)(rfbTightFill << 4);
memcpy (&updateBuf[ublen], tightBeforeBuf, len);
ublen += len;
cl->rfbBytesSent[rfbEncodingTight] += len + 1;
return TRUE;
}
static Bool
SendMonoRect(cl, w, h)
rfbClientPtr cl;
int w, h;
{
int streamId = 1;
int paletteLen, dataLen;
monorect++; monopixels+=w*h;
if ( (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;
updateBuf[ublen++] = (streamId | rfbTightExplicitFilter) << 4;
updateBuf[ublen++] = rfbTightFilterPalette;
updateBuf[ublen++] = 1;
/* Prepare palette, convert image. */
switch (cl->format.bitsPerPixel) {
case 32:
EncodeMonoRect32((CARD8 *)tightBeforeBuf, w, h);
((CARD32 *)tightAfterBuf)[0] = monoBackground;
((CARD32 *)tightAfterBuf)[1] = monoForeground;
if (usePixelFormat24) {
Pack24(tightAfterBuf, &cl->format, 2);
paletteLen = 6;
} else
paletteLen = 8;
memcpy(&updateBuf[ublen], tightAfterBuf, paletteLen);
ublen += paletteLen;
cl->rfbBytesSent[rfbEncodingTight] += 3 + paletteLen;
break;
case 16:
EncodeMonoRect16((CARD8 *)tightBeforeBuf, w, h);
((CARD16 *)tightAfterBuf)[0] = (CARD16)monoBackground;
((CARD16 *)tightAfterBuf)[1] = (CARD16)monoForeground;
memcpy(&updateBuf[ublen], tightAfterBuf, 4);
ublen += 4;
cl->rfbBytesSent[rfbEncodingTight] += 7;
break;
default:
EncodeMonoRect8((CARD8 *)tightBeforeBuf, w, h);
updateBuf[ublen++] = (char)monoBackground;
updateBuf[ublen++] = (char)monoForeground;
cl->rfbBytesSent[rfbEncodingTight] += 5;
}
return CompressData(cl, streamId, dataLen,
tightConf[compressLevel].monoZlibLevel,
Z_DEFAULT_STRATEGY);
}
static Bool
SendIndexedRect(cl, w, h)
rfbClientPtr cl;
int w, h;
{
int streamId = 2;
int i, entryLen;
ndxrect++; ndxpixels+=w*h;
if ( (ublen + TIGHT_MIN_TO_COMPRESS + 6 +
paletteNumColors * cl->format.bitsPerPixel / 8) > UPDATE_BUF_SIZE ) {
if (!rfbSendUpdateBuf(cl))
return FALSE;
}
/* Prepare tight encoding header. */
updateBuf[ublen++] = (streamId | rfbTightExplicitFilter) << 4;
updateBuf[ublen++] = rfbTightFilterPalette;
updateBuf[ublen++] = (char)(paletteNumColors - 1);
/* Prepare palette, convert image. */
switch (cl->format.bitsPerPixel) {
case 32:
EncodeIndexedRect32((CARD8 *)tightBeforeBuf, w * h);
for (i = 0; i < paletteNumColors; i++) {
((CARD32 *)tightAfterBuf)[i] =
palette.entry[i].listNode->rgb;
}
if (usePixelFormat24) {
Pack24(tightAfterBuf, &cl->format, paletteNumColors);
entryLen = 3;
} else
entryLen = 4;
memcpy(&updateBuf[ublen], tightAfterBuf, paletteNumColors * entryLen);
ublen += paletteNumColors * entryLen;
cl->rfbBytesSent[rfbEncodingTight] += 3 + paletteNumColors * entryLen;
break;
case 16:
EncodeIndexedRect16((CARD8 *)tightBeforeBuf, w * h);
for (i = 0; i < paletteNumColors; i++) {
((CARD16 *)tightAfterBuf)[i] =
(CARD16)palette.entry[i].listNode->rgb;
}
memcpy(&updateBuf[ublen], tightAfterBuf, paletteNumColors * 2);
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 Bool
SendFullColorRect(cl, w, h)
rfbClientPtr cl;
int w, h;
{
int streamId = 0;
int len;
fcrect++; fcpixels+=w*h;
if (ublen + TIGHT_MIN_TO_COMPRESS + 1 > UPDATE_BUF_SIZE) {
if (!rfbSendUpdateBuf(cl))
return FALSE;
}
updateBuf[ublen++] = 0x00; /* stream id = 0, no flushing, no filter */
cl->rfbBytesSent[rfbEncodingTight]++;
if (usePixelFormat24) {
Pack24(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 Bool
SendGradientRect(cl, w, h)
rfbClientPtr cl;
int w, h;
{
int streamId = 3;
int len;
if (cl->format.bitsPerPixel == 8)
return SendFullColorRect(cl, w, h);
gradrect++; gradpixels+=w*h;
if (ublen + TIGHT_MIN_TO_COMPRESS + 2 > UPDATE_BUF_SIZE) {
if (!rfbSendUpdateBuf(cl))
return FALSE;
}
if (prevRowBuf == NULL)
prevRowBuf = (int *)xalloc(2048 * 3 * sizeof(int));
updateBuf[ublen++] = (streamId | rfbTightExplicitFilter) << 4;
updateBuf[ublen++] = rfbTightFilterGradient;
cl->rfbBytesSent[rfbEncodingTight] += 2;
if (usePixelFormat24) {
FilterGradient24(tightBeforeBuf, &cl->format, w, h);
len = 3;
} else if (cl->format.bitsPerPixel == 32) {
FilterGradient32((CARD32 *)tightBeforeBuf, &cl->format, w, h);
len = 4;
} else {
FilterGradient16((CARD16 *)tightBeforeBuf, &cl->format, w, h);
len = 2;
}
return CompressData(cl, streamId, w * h * len,
tightConf[compressLevel].gradientZlibLevel,
Z_FILTERED);
}
static Bool
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(&updateBuf[ublen], tightBeforeBuf, dataLen);
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 Bool SendCompressedData(cl, compressedLen)
rfbClientPtr cl;
int compressedLen;
{
int i, portionLen;
updateBuf[ublen++] = compressedLen & 0x7F;
cl->rfbBytesSent[rfbEncodingTight]++;
if (compressedLen > 0x7F) {
updateBuf[ublen-1] |= 0x80;
updateBuf[ublen++] = compressedLen >> 7 & 0x7F;
cl->rfbBytesSent[rfbEncodingTight]++;
if (compressedLen > 0x3FFF) {
updateBuf[ublen-1] |= 0x80;
updateBuf[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 (ublen + portionLen > UPDATE_BUF_SIZE) {
if (!rfbSendUpdateBuf(cl))
return FALSE;
}
memcpy(&updateBuf[ublen], &tightAfterBuf[i], portionLen);
ublen += portionLen;
}
cl->rfbBytesSent[rfbEncodingTight] += compressedLen;
return TRUE;
}
/*
* Code to determine how many different colors used in rectangle.
*/
static void
FillPalette8(count)
int count;
{
CARD8 *data = (CARD8 *)tightBeforeBuf;
CARD8 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;