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- /* Copyright (C) 2002-2005 RealVNC Ltd. 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.
- */
-
- //
- // ZRLE decoding function.
- //
- // 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
-
- #ifdef CPIXEL
- #define PIXEL_T rdr::CONCAT2E(U,BPP)
- #define READ_PIXEL(is) CONCAT2E(readOpaque,CPIXEL)(is)
- #define ZRLE_DECODE CONCAT2E(zrleDecode,CPIXEL)
- #else
- #define PIXEL_T rdr::CONCAT2E(U,BPP)
- #define READ_PIXEL(is) is->CONCAT2E(readOpaque,BPP)()
- #define ZRLE_DECODE CONCAT2E(zrleDecode,BPP)
- #endif
-
- void ZRLE_DECODE (const Rect& r, rdr::InStream* is,
- rdr::ZlibInStream* zis,
- const PixelFormat& pf, ModifiablePixelBuffer* pb)
- {
- int length = is->readU32();
- zis->setUnderlying(is, length);
- Rect t;
- PIXEL_T buf[64 * 64];
-
- for (t.tl.y = r.tl.y; t.tl.y < r.br.y; t.tl.y += 64) {
-
- t.br.y = __rfbmin(r.br.y, t.tl.y + 64);
-
- for (t.tl.x = r.tl.x; t.tl.x < r.br.x; t.tl.x += 64) {
-
- t.br.x = __rfbmin(r.br.x, t.tl.x + 64);
-
- zlibHasData(zis, 1);
- int mode = zis->readU8();
- bool rle = mode & 128;
- int palSize = mode & 127;
- PIXEL_T palette[128];
-
- #ifdef CPIXEL
- zlibHasData(zis, 3 * palSize);
- #else
- zlibHasData(zis, BPP/8 * palSize);
- #endif
- for (int i = 0; i < palSize; i++) {
- palette[i] = READ_PIXEL(zis);
- }
-
- if (palSize == 1) {
- PIXEL_T pix = palette[0];
- pb->fillRect(pf, t, &pix);
- continue;
- }
-
- if (!rle) {
- if (palSize == 0) {
-
- // raw
-
- #ifdef CPIXEL
- zlibHasData(zis, 3 * t.area());
- for (PIXEL_T* ptr = buf; ptr < buf+t.area(); ptr++) {
- *ptr = READ_PIXEL(zis);
- }
- #else
- zlibHasData(zis, BPP/8 * t.area());
- zis->readBytes(buf, t.area() * (BPP / 8));
- #endif
-
- } else {
-
- // packed pixels
- int bppp = ((palSize > 16) ? 8 :
- ((palSize > 4) ? 4 : ((palSize > 2) ? 2 : 1)));
-
- PIXEL_T* ptr = buf;
-
- for (int i = 0; i < t.height(); i++) {
- PIXEL_T* eol = ptr + t.width();
- rdr::U8 byte = 0;
- rdr::U8 nbits = 0;
-
- while (ptr < eol) {
- if (nbits == 0) {
- zlibHasData(zis, 1);
- byte = zis->readU8();
- nbits = 8;
- }
- nbits -= bppp;
- rdr::U8 index = (byte >> nbits) & ((1 << bppp) - 1) & 127;
- *ptr++ = palette[index];
- }
- }
- }
-
- } else {
-
- if (palSize == 0) {
-
- // plain RLE
-
- PIXEL_T* ptr = buf;
- PIXEL_T* end = ptr + t.area();
- while (ptr < end) {
- #ifdef CPIXEL
- zlibHasData(zis, 3);
- #else
- zlibHasData(zis, BPP/8);
- #endif
- PIXEL_T pix = READ_PIXEL(zis);
- int len = 1;
- int b;
- do {
- zlibHasData(zis, 1);
- b = zis->readU8();
- len += b;
- } while (b == 255);
-
- if (end - ptr < len) {
- throw Exception ("ZRLE decode error");
- }
-
- while (len-- > 0) *ptr++ = pix;
-
- }
- } else {
-
- // palette RLE
-
- PIXEL_T* ptr = buf;
- PIXEL_T* end = ptr + t.area();
- while (ptr < end) {
- zlibHasData(zis, 1);
- int index = zis->readU8();
- int len = 1;
- if (index & 128) {
- int b;
- do {
- zlibHasData(zis, 1);
- b = zis->readU8();
- len += b;
- } while (b == 255);
-
- if (end - ptr < len) {
- throw Exception ("ZRLE decode error");
- }
- }
-
- index &= 127;
-
- PIXEL_T pix = palette[index];
-
- while (len-- > 0) *ptr++ = pix;
- }
- }
- }
-
- pb->imageRect(pf, t, buf);
- }
- }
-
- zis->flushUnderlying();
- zis->setUnderlying(NULL, 0);
- }
-
- #undef ZRLE_DECODE
- #undef READ_PIXEL
- #undef PIXEL_T
- }
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