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https://github.com/TigerVNC/tigervnc.git
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![Constantin Kaplinsky](/assets/img/avatar_default.png)
git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@2 3789f03b-4d11-0410-bbf8-ca57d06f2519
252 lines
6.3 KiB
C++
252 lines
6.3 KiB
C++
/* Copyright (C) 2002-2003 RealVNC Ltd. 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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//
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// ZRLE decoding function.
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//
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// This file is #included after having set the following macros:
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// BPP - 8, 16 or 32
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// EXTRA_ARGS - optional extra arguments
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// FILL_RECT - fill a rectangle with a single colour
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// IMAGE_RECT - draw a rectangle of pixel data from a buffer
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#include <rdr/InStream.h>
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#include <rdr/ZlibInStream.h>
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#include <assert.h>
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namespace rfb {
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// CONCAT2E concatenates its arguments, expanding them if they are macros
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#ifndef CONCAT2E
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#define CONCAT2(a,b) a##b
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#define CONCAT2E(a,b) CONCAT2(a,b)
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#endif
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#ifdef CPIXEL
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#define PIXEL_T rdr::CONCAT2E(U,BPP)
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#define READ_PIXEL CONCAT2E(readOpaque,CPIXEL)
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#define ZRLE_DECODE CONCAT2E(zrleDecode,CPIXEL)
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#else
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#define PIXEL_T rdr::CONCAT2E(U,BPP)
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#define READ_PIXEL CONCAT2E(readOpaque,BPP)
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#define ZRLE_DECODE CONCAT2E(zrleDecode,BPP)
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#endif
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void ZRLE_DECODE (const Rect& r, rdr::InStream* is,
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rdr::ZlibInStream* zis, PIXEL_T* buf
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#ifdef EXTRA_ARGS
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, EXTRA_ARGS
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#endif
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)
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{
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int length = is->readU32();
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zis->setUnderlying(is, length);
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Rect t;
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for (t.tl.y = r.tl.y; t.tl.y < r.br.y; t.tl.y += 64) {
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t.br.y = min(r.br.y, t.tl.y + 64);
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for (t.tl.x = r.tl.x; t.tl.x < r.br.x; t.tl.x += 64) {
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t.br.x = min(r.br.x, t.tl.x + 64);
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int mode = zis->readU8();
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bool rle = mode & 128;
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int palSize = mode & 127;
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PIXEL_T palette[128];
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for (int i = 0; i < palSize; i++) {
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palette[i] = zis->READ_PIXEL();
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}
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if (palSize == 1) {
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PIXEL_T pix = palette[0];
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FILL_RECT(t,pix);
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continue;
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}
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if (!rle) {
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if (palSize == 0) {
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// raw
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#ifdef CPIXEL
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for (PIXEL_T* ptr = buf; ptr < buf+t.area(); ptr++) {
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*ptr = zis->READ_PIXEL();
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}
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#else
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zis->readBytes(buf, t.area() * (BPP / 8));
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#endif
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} else {
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// packed pixels
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int bppp = ((palSize > 16) ? 8 :
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((palSize > 4) ? 4 : ((palSize > 2) ? 2 : 1)));
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PIXEL_T* ptr = buf;
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for (int i = 0; i < t.height(); i++) {
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PIXEL_T* eol = ptr + t.width();
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rdr::U8 byte = 0;
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rdr::U8 nbits = 0;
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while (ptr < eol) {
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if (nbits == 0) {
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byte = zis->readU8();
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nbits = 8;
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}
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nbits -= bppp;
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rdr::U8 index = (byte >> nbits) & ((1 << bppp) - 1) & 127;
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*ptr++ = palette[index];
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}
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}
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}
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#ifdef FAVOUR_FILL_RECT
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//fprintf(stderr,"copying data to screen %dx%d at %d,%d\n",
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//t.width(),t.height(),t.tl.x,t.tl.y);
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IMAGE_RECT(t,buf);
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#endif
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} else {
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if (palSize == 0) {
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// plain RLE
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PIXEL_T* ptr = buf;
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PIXEL_T* end = ptr + t.area();
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while (ptr < end) {
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PIXEL_T pix = zis->READ_PIXEL();
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int len = 1;
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int b;
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do {
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b = zis->readU8();
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len += b;
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} while (b == 255);
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assert(len <= end - ptr);
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#ifdef FAVOUR_FILL_RECT
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int i = ptr - buf;
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ptr += len;
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int runX = i % t.width();
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int runY = i / t.width();
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if (runX + len > t.width()) {
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if (runX != 0) {
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FILL_RECT(Rect(t.tl.x+runX, t.tl.y+runY, t.width()-runX, 1),
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pix);
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len -= t.width()-runX;
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runX = 0;
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runY++;
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}
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if (len > t.width()) {
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FILL_RECT(Rect(t.tl.x, t.tl.y+runY, t.width(), len/t.width()),
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pix);
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runY += len / t.width();
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len = len % t.width();
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}
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}
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if (len != 0) {
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FILL_RECT(Rect(t.tl.x+runX, t.tl.y+runY, len, 1), pix);
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}
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#else
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while (len-- > 0) *ptr++ = pix;
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#endif
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}
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} else {
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// palette RLE
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PIXEL_T* ptr = buf;
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PIXEL_T* end = ptr + t.area();
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while (ptr < end) {
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int index = zis->readU8();
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int len = 1;
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if (index & 128) {
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int b;
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do {
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b = zis->readU8();
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len += b;
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} while (b == 255);
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assert(len <= end - ptr);
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}
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index &= 127;
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PIXEL_T pix = palette[index];
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#ifdef FAVOUR_FILL_RECT
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int i = ptr - buf;
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ptr += len;
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int runX = i % t.width();
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int runY = i / t.width();
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if (runX + len > t.width()) {
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if (runX != 0) {
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FILL_RECT(Rect(t.tl.x+runX, t.tl.y+runY, t.width()-runX, 1),
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pix);
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len -= t.width()-runX;
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runX = 0;
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runY++;
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}
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if (len > t.width()) {
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FILL_RECT(Rect(t.tl.x, t.tl.y+runY, t.width(), len/t.width()),
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pix);
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runY += len / t.width();
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len = len % t.width();
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}
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}
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if (len != 0) {
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FILL_RECT(Rect(t.tl.x+runX, t.tl.y+runY, len, 1), pix);
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}
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#else
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while (len-- > 0) *ptr++ = pix;
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#endif
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}
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}
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}
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#ifndef FAVOUR_FILL_RECT
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//fprintf(stderr,"copying data to screen %dx%d at %d,%d\n",
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//t.width(),t.height(),t.tl.x,t.tl.y);
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IMAGE_RECT(t,buf);
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#endif
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}
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}
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zis->reset();
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}
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#undef ZRLE_DECODE
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#undef READ_PIXEL
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#undef PIXEL_T
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}
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