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- /* Copyright (C) 2000-2003 Constantin Kaplinsky. All Rights Reserved.
- * Copyright 2004-2005 Cendio AB.
- * Copyright 2009-2015 Pierre Ossman for Cendio AB
- * Copyright (C) 2011 D. R. Commander. All Rights Reserved.
- *
- * This is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This software is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this software; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
- * USA.
- */
-
- //
- // Tight decoding functions.
- //
- // This file is #included after having set the following macro:
- // BPP - 8, 16 or 32
-
- namespace rfb {
-
- // CONCAT2E concatenates its arguments, expanding them if they are macros
-
- #ifndef CONCAT2E
- #define CONCAT2(a,b) a##b
- #define CONCAT2E(a,b) CONCAT2(a,b)
- #endif
-
- #define PIXEL_T rdr::CONCAT2E(U,BPP)
-
- #if BPP == 32
-
- void
- TightDecoder::FilterGradient24(const rdr::U8 *inbuf,
- const PixelFormat& pf, PIXEL_T* outbuf,
- int stride, const Rect& r)
- {
- int x, y, c;
- rdr::U8 prevRow[TIGHT_MAX_WIDTH*3];
- rdr::U8 thisRow[TIGHT_MAX_WIDTH*3];
- rdr::U8 pix[3];
- int est[3];
-
- memset(prevRow, 0, sizeof(prevRow));
-
- // Set up shortcut variables
- int rectHeight = r.height();
- int rectWidth = r.width();
-
- for (y = 0; y < rectHeight; y++) {
- for (x = 0; x < rectWidth; x++) {
- /* First pixel in a row */
- if (x == 0) {
- for (c = 0; c < 3; c++) {
- pix[c] = inbuf[y*rectWidth*3+c] + prevRow[c];
- thisRow[c] = pix[c];
- }
- pf.bufferFromRGB((rdr::U8*)&outbuf[y*stride], pix, 1);
- continue;
- }
-
- for (c = 0; c < 3; c++) {
- est[c] = prevRow[x*3+c] + pix[c] - prevRow[(x-1)*3+c];
- if (est[c] > 0xff) {
- est[c] = 0xff;
- } else if (est[c] < 0) {
- est[c] = 0;
- }
- pix[c] = inbuf[(y*rectWidth+x)*3+c] + est[c];
- thisRow[x*3+c] = pix[c];
- }
- pf.bufferFromRGB((rdr::U8*)&outbuf[y*stride+x], pix, 1);
- }
-
- memcpy(prevRow, thisRow, sizeof(prevRow));
- }
- }
-
- #endif
-
- #if BPP != 8
-
- void TightDecoder::FilterGradient(const rdr::U8* inbuf,
- const PixelFormat& pf, PIXEL_T* outbuf,
- int stride, const Rect& r)
- {
- int x, y, c;
- static rdr::U8 prevRow[TIGHT_MAX_WIDTH*3];
- static rdr::U8 thisRow[TIGHT_MAX_WIDTH*3];
- rdr::U8 pix[3];
- int est[3];
-
- memset(prevRow, 0, sizeof(prevRow));
-
- // Set up shortcut variables
- int rectHeight = r.height();
- int rectWidth = r.width();
-
- for (y = 0; y < rectHeight; y++) {
- for (x = 0; x < rectWidth; x++) {
- /* First pixel in a row */
- if (x == 0) {
- pf.rgbFromBuffer(pix, &inbuf[y*rectWidth], 1);
- for (c = 0; c < 3; c++)
- pix[c] += prevRow[c];
-
- memcpy(thisRow, pix, sizeof(pix));
-
- pf.bufferFromRGB((rdr::U8*)&outbuf[y*stride], pix, 1);
-
- continue;
- }
-
- for (c = 0; c < 3; c++) {
- est[c] = prevRow[x*3+c] + pix[c] - prevRow[(x-1)*3+c];
- if (est[c] > 255) {
- est[c] = 255;
- } else if (est[c] < 0) {
- est[c] = 0;
- }
- }
-
- pf.rgbFromBuffer(pix, &inbuf[y*rectWidth+x], 1);
- for (c = 0; c < 3; c++)
- pix[c] += est[c];
-
- memcpy(&thisRow[x*3], pix, sizeof(pix));
-
- pf.bufferFromRGB((rdr::U8*)&outbuf[y*stride+x], pix, 1);
- }
-
- memcpy(prevRow, thisRow, sizeof(prevRow));
- }
- }
-
- #endif
-
- void TightDecoder::FilterPalette(const PIXEL_T* palette, int palSize,
- const rdr::U8* inbuf, PIXEL_T* outbuf,
- int stride, const Rect& r)
- {
- // Indexed color
- int x, h = r.height(), w = r.width(), b, pad = stride - w;
- PIXEL_T* ptr = outbuf;
- rdr::U8 bits;
- const rdr::U8* srcPtr = inbuf;
- if (palSize <= 2) {
- // 2-color palette
- while (h > 0) {
- for (x = 0; x < w / 8; x++) {
- bits = *srcPtr++;
- for (b = 7; b >= 0; b--) {
- *ptr++ = palette[bits >> b & 1];
- }
- }
- if (w % 8 != 0) {
- bits = *srcPtr++;
- for (b = 7; b >= 8 - w % 8; b--) {
- *ptr++ = palette[bits >> b & 1];
- }
- }
- ptr += pad;
- h--;
- }
- } else {
- // 256-color palette
- while (h > 0) {
- PIXEL_T *endOfRow = ptr + w;
- while (ptr < endOfRow) {
- *ptr++ = palette[*srcPtr++];
- }
- ptr += pad;
- h--;
- }
- }
- }
-
- #undef PIXEL_T
- }
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