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1810 lines
67 KiB
1810 lines
67 KiB
/*
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* tight.c
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*
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* Routines to implement Tight Encoding
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*/
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/*
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* Copyright (C) 2000, 2001 Const Kaplinsky. All Rights Reserved.
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* Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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/*#include <stdio.h>*/
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#include "rfb.h"
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#ifdef WIN32
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#define XMD_H
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#undef FAR
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#define NEEDFAR_POINTERS
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#endif
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#include <jpeglib.h>
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/* Note: The following constant should not be changed. */
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#define TIGHT_MIN_TO_COMPRESS 12
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/* The parameters below may be adjusted. */
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#define MIN_SPLIT_RECT_SIZE 4096
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#define MIN_SOLID_SUBRECT_SIZE 2048
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#define MAX_SPLIT_TILE_SIZE 16
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/* May be set to TRUE with "-lazytight" Xvnc option. */
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Bool rfbTightDisableGradient = FALSE;
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/* This variable is set on every rfbSendRectEncodingTight() call. */
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static Bool usePixelFormat24;
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/* Compression level stuff. The following array contains various
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encoder parameters for each of 10 compression levels (0..9).
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Last three parameters correspond to JPEG quality levels (0..9). */
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typedef struct TIGHT_CONF_s {
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int maxRectSize, maxRectWidth;
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int monoMinRectSize, gradientMinRectSize;
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int idxZlibLevel, monoZlibLevel, rawZlibLevel, gradientZlibLevel;
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int gradientThreshold, gradientThreshold24;
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int idxMaxColorsDivisor;
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int jpegQuality, jpegThreshold, jpegThreshold24;
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} TIGHT_CONF;
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static TIGHT_CONF tightConf[10] = {
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{ 512, 32, 6, 65536, 0, 0, 0, 0, 0, 0, 4, 20, 10000, 23000 },
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{ 2048, 128, 6, 65536, 1, 1, 1, 0, 0, 0, 8, 30, 8000, 18000 },
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{ 6144, 256, 8, 65536, 3, 3, 2, 0, 0, 0, 24, 40, 6500, 15000 },
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{ 10240, 1024, 12, 65536, 5, 5, 3, 0, 0, 0, 32, 50, 5000, 12000 },
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{ 16384, 2048, 12, 65536, 6, 6, 4, 0, 0, 0, 32, 55, 4000, 10000 },
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{ 32768, 2048, 12, 4096, 7, 7, 5, 4, 150, 380, 32, 60, 3000, 8000 },
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{ 65536, 2048, 16, 4096, 7, 7, 6, 4, 170, 420, 48, 65, 2000, 5000 },
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{ 65536, 2048, 16, 4096, 8, 8, 7, 5, 180, 450, 64, 70, 1000, 2500 },
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{ 65536, 2048, 32, 8192, 9, 9, 8, 6, 190, 475, 64, 75, 500, 1200 },
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{ 65536, 2048, 32, 8192, 9, 9, 9, 6, 200, 500, 96, 80, 200, 500 }
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};
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static int compressLevel;
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static int qualityLevel;
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/* Stuff dealing with palettes. */
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typedef struct COLOR_LIST_s {
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struct COLOR_LIST_s *next;
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int idx;
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CARD32 rgb;
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} COLOR_LIST;
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typedef struct PALETTE_ENTRY_s {
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COLOR_LIST *listNode;
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int numPixels;
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} PALETTE_ENTRY;
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typedef struct PALETTE_s {
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PALETTE_ENTRY entry[256];
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COLOR_LIST *hash[256];
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COLOR_LIST list[256];
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} PALETTE;
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static int paletteNumColors, paletteMaxColors;
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static CARD32 monoBackground, monoForeground;
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static PALETTE palette;
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/* Pointers to dynamically-allocated buffers. */
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static int tightBeforeBufSize = 0;
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static char *tightBeforeBuf = NULL;
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static int tightAfterBufSize = 0;
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static char *tightAfterBuf = NULL;
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static int *prevRowBuf = NULL;
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/* Prototypes for static functions. */
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static void FindBestSolidArea (rfbClientPtr cl, int x, int y, int w, int h,
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CARD32 colorValue, int *w_ptr, int *h_ptr);
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static void ExtendSolidArea (rfbClientPtr cl, int x, int y, int w, int h,
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CARD32 colorValue,
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int *x_ptr, int *y_ptr, int *w_ptr, int *h_ptr);
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static Bool CheckSolidTile (rfbClientPtr cl, int x, int y, int w, int h,
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CARD32 *colorPtr, Bool needSameColor);
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static Bool CheckSolidTile8 (rfbClientPtr cl, int x, int y, int w, int h,
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CARD32 *colorPtr, Bool needSameColor);
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static Bool CheckSolidTile16 (rfbClientPtr cl, int x, int y, int w, int h,
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CARD32 *colorPtr, Bool needSameColor);
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static Bool CheckSolidTile32 (rfbClientPtr cl, int x, int y, int w, int h,
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CARD32 *colorPtr, Bool needSameColor);
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static Bool SendRectSimple (rfbClientPtr cl, int x, int y, int w, int h);
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static Bool SendSubrect (rfbClientPtr cl, int x, int y, int w, int h);
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static Bool SendTightHeader (rfbClientPtr cl, int x, int y, int w, int h);
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static Bool SendSolidRect (rfbClientPtr cl);
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static Bool SendMonoRect (rfbClientPtr cl, int w, int h);
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static Bool SendIndexedRect (rfbClientPtr cl, int w, int h);
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static Bool SendFullColorRect (rfbClientPtr cl, int w, int h);
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static Bool SendGradientRect (rfbClientPtr cl, int w, int h);
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static Bool CompressData(rfbClientPtr cl, int streamId, int dataLen,
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int zlibLevel, int zlibStrategy);
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static Bool SendCompressedData(rfbClientPtr cl, int compressedLen);
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static void FillPalette8(int count);
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static void FillPalette16(int count);
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static void FillPalette32(int count);
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static void PaletteReset(void);
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static int PaletteInsert(CARD32 rgb, int numPixels, int bpp);
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static void Pack24(rfbClientPtr cl, char *buf, rfbPixelFormat *fmt, int count);
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static void EncodeIndexedRect16(CARD8 *buf, int count);
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static void EncodeIndexedRect32(CARD8 *buf, int count);
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static void EncodeMonoRect8(CARD8 *buf, int w, int h);
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static void EncodeMonoRect16(CARD8 *buf, int w, int h);
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static void EncodeMonoRect32(CARD8 *buf, int w, int h);
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static void FilterGradient24(rfbClientPtr cl, char *buf, rfbPixelFormat *fmt, int w, int h);
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static void FilterGradient16(rfbClientPtr cl, CARD16 *buf, rfbPixelFormat *fmt, int w, int h);
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static void FilterGradient32(rfbClientPtr cl, CARD32 *buf, rfbPixelFormat *fmt, int w, int h);
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static int DetectSmoothImage(rfbClientPtr cl, rfbPixelFormat *fmt, int w, int h);
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static unsigned long DetectSmoothImage24(rfbClientPtr cl, rfbPixelFormat *fmt, int w, int h);
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static unsigned long DetectSmoothImage16(rfbClientPtr cl, rfbPixelFormat *fmt, int w, int h);
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static unsigned long DetectSmoothImage32(rfbClientPtr cl, rfbPixelFormat *fmt, int w, int h);
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static Bool SendJpegRect(rfbClientPtr cl, int x, int y, int w, int h,
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int quality);
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static void PrepareRowForJpeg(rfbClientPtr cl, CARD8 *dst, int x, int y, int count);
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static void PrepareRowForJpeg24(rfbClientPtr cl, CARD8 *dst, int x, int y, int count);
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static void PrepareRowForJpeg16(rfbClientPtr cl, CARD8 *dst, int x, int y, int count);
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static void PrepareRowForJpeg32(rfbClientPtr cl, CARD8 *dst, int x, int y, int count);
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static void JpegInitDestination(j_compress_ptr cinfo);
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static boolean JpegEmptyOutputBuffer(j_compress_ptr cinfo);
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static void JpegTermDestination(j_compress_ptr cinfo);
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static void JpegSetDstManager(j_compress_ptr cinfo);
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/*
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* Tight encoding implementation.
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*/
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int
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rfbNumCodedRectsTight(cl, x, y, w, h)
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rfbClientPtr cl;
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int x, y, w, h;
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{
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int maxRectSize, maxRectWidth;
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int subrectMaxWidth, subrectMaxHeight;
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/* No matter how many rectangles we will send if LastRect markers
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are used to terminate rectangle stream. */
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if (cl->enableLastRectEncoding && w * h >= MIN_SPLIT_RECT_SIZE)
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return 0;
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maxRectSize = tightConf[cl->tightCompressLevel].maxRectSize;
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maxRectWidth = tightConf[cl->tightCompressLevel].maxRectWidth;
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if (w > maxRectWidth || w * h > maxRectSize) {
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subrectMaxWidth = (w > maxRectWidth) ? maxRectWidth : w;
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subrectMaxHeight = maxRectSize / subrectMaxWidth;
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return (((w - 1) / maxRectWidth + 1) *
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((h - 1) / subrectMaxHeight + 1));
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} else {
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return 1;
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}
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}
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Bool
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rfbSendRectEncodingTight(cl, x, y, w, h)
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rfbClientPtr cl;
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int x, y, w, h;
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{
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int nMaxRows;
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CARD32 colorValue;
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int dx, dy, dw, dh;
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int x_best, y_best, w_best, h_best;
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char *fbptr;
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compressLevel = cl->tightCompressLevel;
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qualityLevel = cl->tightQualityLevel;
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if ( cl->format.depth == 24 && cl->format.redMax == 0xFF &&
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cl->format.greenMax == 0xFF && cl->format.blueMax == 0xFF ) {
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usePixelFormat24 = TRUE;
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} else {
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usePixelFormat24 = FALSE;
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}
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if (!cl->enableLastRectEncoding || w * h < MIN_SPLIT_RECT_SIZE)
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return SendRectSimple(cl, x, y, w, h);
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/* Make sure we can write at least one pixel into tightBeforeBuf. */
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if (tightBeforeBufSize < 4) {
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tightBeforeBufSize = 4;
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if (tightBeforeBuf == NULL)
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tightBeforeBuf = (char *)malloc(tightBeforeBufSize);
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else
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tightBeforeBuf = (char *)realloc(tightBeforeBuf,
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tightBeforeBufSize);
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}
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/* Calculate maximum number of rows in one non-solid rectangle. */
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{
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int maxRectSize, maxRectWidth, nMaxWidth;
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maxRectSize = tightConf[compressLevel].maxRectSize;
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maxRectWidth = tightConf[compressLevel].maxRectWidth;
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nMaxWidth = (w > maxRectWidth) ? maxRectWidth : w;
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nMaxRows = maxRectSize / nMaxWidth;
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}
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/* Try to find large solid-color areas and send them separately. */
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for (dy = y; dy < y + h; dy += MAX_SPLIT_TILE_SIZE) {
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/* If a rectangle becomes too large, send its upper part now. */
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if (dy - y >= nMaxRows) {
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if (!SendRectSimple(cl, x, y, w, nMaxRows))
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return 0;
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y += nMaxRows;
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h -= nMaxRows;
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}
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dh = (dy + MAX_SPLIT_TILE_SIZE <= y + h) ?
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MAX_SPLIT_TILE_SIZE : (y + h - dy);
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for (dx = x; dx < x + w; dx += MAX_SPLIT_TILE_SIZE) {
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dw = (dx + MAX_SPLIT_TILE_SIZE <= x + w) ?
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MAX_SPLIT_TILE_SIZE : (x + w - dx);
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if (CheckSolidTile(cl, dx, dy, dw, dh, &colorValue, FALSE)) {
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/* Get dimensions of solid-color area. */
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FindBestSolidArea(cl, dx, dy, w - (dx - x), h - (dy - y),
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colorValue, &w_best, &h_best);
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/* Make sure a solid rectangle is large enough
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(or the whole rectangle is of the same color). */
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if ( w_best * h_best != w * h &&
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w_best * h_best < MIN_SOLID_SUBRECT_SIZE )
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continue;
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/* Try to extend solid rectangle to maximum size. */
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x_best = dx; y_best = dy;
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ExtendSolidArea(cl, x, y, w, h, colorValue,
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&x_best, &y_best, &w_best, &h_best);
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/* Send rectangles at top and left to solid-color area. */
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if ( y_best != y &&
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!SendRectSimple(cl, x, y, w, y_best-y) )
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return FALSE;
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if ( x_best != x &&
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!rfbSendRectEncodingTight(cl, x, y_best,
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x_best-x, h_best) )
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return FALSE;
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/* Send solid-color rectangle. */
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if (!SendTightHeader(cl, x_best, y_best, w_best, h_best))
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return FALSE;
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fbptr = (cl->screen->frameBuffer +
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(cl->screen->paddedWidthInBytes * y_best) +
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(x_best * (cl->screen->bitsPerPixel / 8)));
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(*cl->translateFn)(cl->translateLookupTable, &cl->screen->rfbServerFormat,
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&cl->format, fbptr, tightBeforeBuf,
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cl->screen->paddedWidthInBytes, 1, 1);
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if (!SendSolidRect(cl))
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return FALSE;
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/* Send remaining rectangles (at right and bottom). */
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if ( x_best + w_best != x + w &&
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!rfbSendRectEncodingTight(cl, x_best+w_best, y_best,
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w-(x_best-x)-w_best, h_best) )
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return FALSE;
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if ( y_best + h_best != y + h &&
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!rfbSendRectEncodingTight(cl, x, y_best+h_best,
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w, h-(y_best-y)-h_best) )
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return FALSE;
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/* Return after all recursive calls are done. */
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return TRUE;
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}
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}
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}
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/* No suitable solid-color rectangles found. */
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return SendRectSimple(cl, x, y, w, h);
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}
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static void
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FindBestSolidArea(cl, x, y, w, h, colorValue, w_ptr, h_ptr)
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rfbClientPtr cl;
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int x, y, w, h;
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CARD32 colorValue;
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int *w_ptr, *h_ptr;
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{
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int dx, dy, dw, dh;
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int w_prev;
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int w_best = 0, h_best = 0;
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w_prev = w;
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for (dy = y; dy < y + h; dy += MAX_SPLIT_TILE_SIZE) {
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dh = (dy + MAX_SPLIT_TILE_SIZE <= y + h) ?
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MAX_SPLIT_TILE_SIZE : (y + h - dy);
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dw = (w_prev > MAX_SPLIT_TILE_SIZE) ?
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MAX_SPLIT_TILE_SIZE : w_prev;
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if (!CheckSolidTile(cl, x, dy, dw, dh, &colorValue, TRUE))
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break;
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for (dx = x + dw; dx < x + w_prev;) {
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dw = (dx + MAX_SPLIT_TILE_SIZE <= x + w_prev) ?
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MAX_SPLIT_TILE_SIZE : (x + w_prev - dx);
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if (!CheckSolidTile(cl, dx, dy, dw, dh, &colorValue, TRUE))
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break;
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dx += dw;
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}
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w_prev = dx - x;
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if (w_prev * (dy + dh - y) > w_best * h_best) {
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w_best = w_prev;
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h_best = dy + dh - y;
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}
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}
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*w_ptr = w_best;
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*h_ptr = h_best;
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}
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static void
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ExtendSolidArea(cl, x, y, w, h, colorValue, x_ptr, y_ptr, w_ptr, h_ptr)
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rfbClientPtr cl;
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int x, y, w, h;
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CARD32 colorValue;
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int *x_ptr, *y_ptr, *w_ptr, *h_ptr;
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{
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int cx, cy;
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/* Try to extend the area upwards. */
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for ( cy = *y_ptr - 1;
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cy >= y && CheckSolidTile(cl, *x_ptr, cy, *w_ptr, 1, &colorValue, TRUE);
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cy-- );
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*h_ptr += *y_ptr - (cy + 1);
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*y_ptr = cy + 1;
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/* ... downwards. */
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for ( cy = *y_ptr + *h_ptr;
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cy < y + h &&
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CheckSolidTile(cl, *x_ptr, cy, *w_ptr, 1, &colorValue, TRUE);
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cy++ );
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*h_ptr += cy - (*y_ptr + *h_ptr);
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/* ... to the left. */
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for ( cx = *x_ptr - 1;
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cx >= x && CheckSolidTile(cl, cx, *y_ptr, 1, *h_ptr, &colorValue, TRUE);
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cx-- );
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*w_ptr += *x_ptr - (cx + 1);
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*x_ptr = cx + 1;
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/* ... to the right. */
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for ( cx = *x_ptr + *w_ptr;
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cx < x + w &&
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CheckSolidTile(cl, cx, *y_ptr, 1, *h_ptr, &colorValue, TRUE);
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cx++ );
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*w_ptr += cx - (*x_ptr + *w_ptr);
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}
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static Bool
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CheckSolidTile(cl, x, y, w, h, colorPtr, needSameColor)
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rfbClientPtr cl;
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int x, y, w, h;
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CARD32 *colorPtr;
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Bool needSameColor;
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{
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switch(cl->screen->rfbServerFormat.bitsPerPixel) {
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case 32:
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return CheckSolidTile32(cl, x, y, w, h, colorPtr, needSameColor);
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case 16:
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return CheckSolidTile16(cl, x, y, w, h, colorPtr, needSameColor);
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default:
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return CheckSolidTile8(cl, x, y, w, h, colorPtr, needSameColor);
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}
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}
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#define DEFINE_CHECK_SOLID_FUNCTION(bpp) \
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\
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static Bool \
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CheckSolidTile##bpp(cl, x, y, w, h, colorPtr, needSameColor) \
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rfbClientPtr cl; \
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int x, y, w, h; \
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CARD32 *colorPtr; \
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Bool needSameColor; \
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{ \
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CARD##bpp *fbptr; \
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CARD##bpp colorValue; \
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int dx, dy; \
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\
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fbptr = (CARD##bpp *) \
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&cl->screen->frameBuffer[y * cl->screen->paddedWidthInBytes + x * (bpp/8)]; \
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\
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colorValue = *fbptr; \
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if (needSameColor && (CARD32)colorValue != *colorPtr) \
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return FALSE; \
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\
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for (dy = 0; dy < h; dy++) { \
|
|
for (dx = 0; dx < w; dx++) { \
|
|
if (colorValue != fbptr[dx]) \
|
|
return FALSE; \
|
|
} \
|
|
fbptr = (CARD##bpp *)((CARD8 *)fbptr + cl->screen->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 *)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 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 (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 Bool
|
|
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 Bool
|
|
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 Bool
|
|
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((CARD8 *)tightBeforeBuf, w, h);
|
|
|
|
((CARD32 *)tightAfterBuf)[0] = monoBackground;
|
|
((CARD32 *)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((CARD8 *)tightBeforeBuf, w, h);
|
|
|
|
((CARD16 *)tightAfterBuf)[0] = (CARD16)monoBackground;
|
|
((CARD16 *)tightAfterBuf)[1] = (CARD16)monoForeground;
|
|
|
|
memcpy(&cl->updateBuf[cl->ublen], tightAfterBuf, 4);
|
|
cl->ublen += 4;
|
|
cl->rfbBytesSent[rfbEncodingTight] += 7;
|
|
break;
|
|
|
|
default:
|
|
EncodeMonoRect8((CARD8 *)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 Bool
|
|
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((CARD8 *)tightBeforeBuf, w * h);
|
|
|
|
for (i = 0; i < paletteNumColors; i++) {
|
|
((CARD32 *)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((CARD8 *)tightBeforeBuf, w * h);
|
|
|
|
for (i = 0; i < paletteNumColors; i++) {
|
|
((CARD16 *)tightAfterBuf)[i] =
|
|
(CARD16)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 Bool
|
|
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 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);
|
|
|
|
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, (CARD32 *)tightBeforeBuf, &cl->format, w, h);
|
|
len = 4;
|
|
} else {
|
|
FilterGradient16(cl, (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(&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 Bool 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;
|
|
}
|
|
portionLen = UPDATE_BUF_SIZE;
|
|
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;
|
|
}
|
|
if (i == count) {
|
|
if (n0 > n1) {
|
|
monoBackground = (CARD32)c0;
|
|
monoForeground = (CARD32)c1;
|
|
} else {
|
|
monoBackground = (CARD32)c1;
|
|
monoForeground = (CARD32)c0;
|
|
}
|
|
paletteNumColors = 2; /* Two colors */
|
|
}
|
|
}
|
|
|
|
#define DEFINE_FILL_PALETTE_FUNCTION(bpp) \
|
|
\
|
|
static void \
|
|
FillPalette##bpp(count) \
|
|
int count; \
|
|
{ \
|
|
CARD##bpp *data = (CARD##bpp *)tightBeforeBuf; \
|
|
CARD##bpp 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 = (CARD32)c0; \
|
|
monoForeground = (CARD32)c1; \
|
|
} else { \
|
|
monoBackground = (CARD32)c1; \
|
|
monoForeground = (CARD32)c0; \
|
|
} \
|
|
paletteNumColors = 2; /* Two colors */ \
|
|
return; \
|
|
} \
|
|
\
|
|
PaletteReset(); \
|
|
PaletteInsert (c0, (CARD32)n0, bpp); \
|
|
PaletteInsert (c1, (CARD32)n1, bpp); \
|
|
\
|
|
ni = 1; \
|
|
for (i++; i < count; i++) { \
|
|
if (data[i] == ci) { \
|
|
ni++; \
|
|
} else { \
|
|
if (!PaletteInsert (ci, (CARD32)ni, bpp)) \
|
|
return; \
|
|
ci = data[i]; \
|
|
ni = 1; \
|
|
} \
|
|
} \
|
|
PaletteInsert (ci, (CARD32)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)
|
|
CARD32 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;
|
|
{
|
|
CARD32 *buf32;
|
|
CARD32 pix;
|
|
int r_shift, g_shift, b_shift;
|
|
|
|
buf32 = (CARD32 *)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) \
|
|
CARD8 *buf; \
|
|
int count; \
|
|
{ \
|
|
COLOR_LIST *pnode; \
|
|
CARD##bpp *src; \
|
|
CARD##bpp rgb; \
|
|
int rep = 0; \
|
|
\
|
|
src = (CARD##bpp *) buf; \
|
|
\
|
|
while (count--) { \
|
|
rgb = *src++; \
|
|
while (count && *src == rgb) { \
|
|
rep++, src++, count--; \
|
|
} \
|
|
pnode = palette.hash[HASH_FUNC##bpp(rgb)]; \
|
|
while (pnode != NULL) { \
|
|
if ((CARD##bpp)pnode->rgb == rgb) { \
|
|
*buf++ = (CARD8)pnode->idx; \
|
|
while (rep) { \
|
|
*buf++ = (CARD8)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) \
|
|
CARD8 *buf; \
|
|
int w, h; \
|
|
{ \
|
|
CARD##bpp *ptr; \
|
|
CARD##bpp bg; \
|
|
unsigned int value, mask; \
|
|
int aligned_width; \
|
|
int x, y, bg_bits; \
|
|
\
|
|
ptr = (CARD##bpp *) buf; \
|
|
bg = (CARD##bpp) 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++ = (CARD8)value; \
|
|
} \
|
|
\
|
|
mask = 0x80; \
|
|
value = 0; \
|
|
if (x >= w) \
|
|
continue; \
|
|
\
|
|
for (; x < w; x++) { \
|
|
if (*ptr++ != bg) { \
|
|
value |= mask; \
|
|
} \
|
|
mask >>= 1; \
|
|
} \
|
|
*buf++ = (CARD8)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;
|
|
{
|
|
CARD32 *buf32;
|
|
CARD32 pix32;
|
|
int *prevRowPtr;
|
|
int shiftBits[3];
|
|
int pixHere[3], pixUpper[3], pixLeft[3], pixUpperLeft[3];
|
|
int prediction;
|
|
int x, y, c;
|
|
|
|
buf32 = (CARD32 *)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; \
|
|
CARD##bpp *buf; \
|
|
rfbPixelFormat *fmt; \
|
|
int w, h; \
|
|
{ \
|
|
CARD##bpp pix, diff; \
|
|
Bool 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; \
|
|
{ \
|
|
Bool endianMismatch; \
|
|
CARD##bpp 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 = ((CARD##bpp *)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 = ((CARD##bpp *)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 Bool jpegError;
|
|
static int jpegDstDataLen;
|
|
|
|
static Bool
|
|
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;
|
|
CARD8 *srcBuf;
|
|
JSAMPROW rowPointer[1];
|
|
int dy;
|
|
|
|
if (cl->screen->rfbServerFormat.bitsPerPixel == 8)
|
|
return SendFullColorRect(cl, w, h);
|
|
|
|
srcBuf = (CARD8 *)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;
|
|
CARD8 *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;
|
|
CARD8 *dst;
|
|
int x, y, count;
|
|
{
|
|
CARD32 *fbptr;
|
|
CARD32 pix;
|
|
|
|
fbptr = (CARD32 *)
|
|
&cl->screen->frameBuffer[y * cl->screen->paddedWidthInBytes + x * 4];
|
|
|
|
while (count--) {
|
|
pix = *fbptr++;
|
|
*dst++ = (CARD8)(pix >> cl->screen->rfbServerFormat.redShift);
|
|
*dst++ = (CARD8)(pix >> cl->screen->rfbServerFormat.greenShift);
|
|
*dst++ = (CARD8)(pix >> cl->screen->rfbServerFormat.blueShift);
|
|
}
|
|
}
|
|
|
|
#define DEFINE_JPEG_GET_ROW_FUNCTION(bpp) \
|
|
\
|
|
static void \
|
|
PrepareRowForJpeg##bpp(cl, dst, x, y, count) \
|
|
rfbClientPtr cl; \
|
|
CARD8 *dst; \
|
|
int x, y, count; \
|
|
{ \
|
|
CARD##bpp *fbptr; \
|
|
CARD##bpp pix; \
|
|
int inRed, inGreen, inBlue; \
|
|
\
|
|
fbptr = (CARD##bpp *) \
|
|
&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++ = (CARD8)((inRed * 255 + cl->screen->rfbServerFormat.redMax / 2) / \
|
|
cl->screen->rfbServerFormat.redMax); \
|
|
*dst++ = (CARD8)((inGreen * 255 + cl->screen->rfbServerFormat.greenMax / 2) / \
|
|
cl->screen->rfbServerFormat.greenMax); \
|
|
*dst++ = (CARD8)((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;
|
|
}
|
|
|