mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-21 01:08:25 +00:00
296 lines
6.8 KiB
C++
296 lines
6.8 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program 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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#include "common/endian.h"
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#include "made/graphics.h"
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namespace Made {
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byte ValueReader::readPixel() {
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byte value;
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if (_nibbleMode) {
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if (_nibbleSwitch) {
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value = (_buffer[0] >> 4) & 0x0F;
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_buffer++;
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} else {
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value = _buffer[0] & 0x0F;
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}
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_nibbleSwitch = !_nibbleSwitch;
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} else {
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value = _buffer[0];
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_buffer++;
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}
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return value;
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}
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uint16 ValueReader::readUint16() {
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uint16 value = READ_LE_UINT16(_buffer);
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_buffer += 2;
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return value;
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}
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uint32 ValueReader::readUint32() {
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uint32 value = READ_LE_UINT32(_buffer);
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_buffer += 4;
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return value;
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}
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void ValueReader::resetNibbleSwitch() {
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_nibbleSwitch = false;
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}
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void decompressImage(byte *source, Graphics::Surface &surface, uint16 cmdOffs, uint16 pixelOffs, uint16 maskOffs, uint16 lineSize, byte cmdFlags, byte pixelFlags, byte maskFlags, bool deltaFrame) {
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const int offsets[] = {
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0, 1, 2, 3,
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320, 321, 322, 323,
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640, 641, 642, 643,
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960, 961, 962, 963
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};
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uint16 width = surface.w;
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uint16 height = surface.h;
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byte *cmdBuffer = source + cmdOffs;
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ValueReader maskReader(source + maskOffs, (maskFlags & 2) != 0);
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ValueReader pixelReader(source + pixelOffs, (pixelFlags & 2) != 0);
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if ((maskFlags != 0) && (maskFlags != 2) && (pixelFlags != 0) && (pixelFlags != 2) && (cmdFlags != 0))
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error("decompressImage() Unsupported flags: cmdFlags = %02X; maskFlags = %02X, pixelFlags = %02X", cmdFlags, maskFlags, pixelFlags);
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byte *destPtr = (byte*)surface.getBasePtr(0, 0);
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byte lineBuf[640 * 4];
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byte bitBuf[40];
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int bitBufLastOfs = (((lineSize + 1) >> 1) << 1) - 2;
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int bitBufLastCount = ((width + 3) >> 2) & 7;
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if (bitBufLastCount == 0)
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bitBufLastCount = 8;
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while (height > 0) {
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int drawDestOfs = 0;
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memset(lineBuf, 0, sizeof(lineBuf));
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memcpy(bitBuf, cmdBuffer, lineSize);
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cmdBuffer += lineSize;
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for (uint16 bitBufOfs = 0; bitBufOfs < lineSize; bitBufOfs += 2) {
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uint16 bits = READ_LE_UINT16(&bitBuf[bitBufOfs]);
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int bitCount;
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if (bitBufOfs == bitBufLastOfs)
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bitCount = bitBufLastCount;
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else
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bitCount = 8;
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for (int curCmd = 0; curCmd < bitCount; curCmd++) {
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int cmd = bits & 3;
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bits >>= 2;
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byte pixels[4];
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uint32 mask;
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switch (cmd) {
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case 0:
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pixels[0] = pixelReader.readPixel();
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for (int i = 0; i < 16; i++)
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lineBuf[drawDestOfs + offsets[i]] = pixels[0];
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break;
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case 1:
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pixels[0] = pixelReader.readPixel();
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pixels[1] = pixelReader.readPixel();
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mask = maskReader.readUint16();
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for (int i = 0; i < 16; i++) {
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lineBuf[drawDestOfs + offsets[i]] = pixels[mask & 1];
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mask >>= 1;
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}
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break;
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case 2:
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pixels[0] = pixelReader.readPixel();
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pixels[1] = pixelReader.readPixel();
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pixels[2] = pixelReader.readPixel();
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pixels[3] = pixelReader.readPixel();
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mask = maskReader.readUint32();
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for (int i = 0; i < 16; i++) {
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lineBuf[drawDestOfs + offsets[i]] = pixels[mask & 3];
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mask >>= 2;
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}
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break;
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case 3:
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if (!deltaFrame) {
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// For EGA pictures: Pixels are read starting from a new byte
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maskReader.resetNibbleSwitch();
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// Yes, it reads from maskReader here
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for (int i = 0; i < 16; i++)
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lineBuf[drawDestOfs + offsets[i]] = maskReader.readPixel();
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}
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break;
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}
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drawDestOfs += 4;
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}
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}
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if (deltaFrame) {
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for (int y = 0; y < 4 && height > 0; y++, height--) {
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for (int x = 0; x < width; x++) {
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if (lineBuf[x + y * 320] != 0)
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*destPtr = lineBuf[x + y * 320];
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destPtr++;
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}
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}
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} else {
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for (int y = 0; y < 4 && height > 0; y++, height--) {
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memcpy(destPtr, &lineBuf[y * 320], width);
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destPtr += width;
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}
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}
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}
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}
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void decompressMovieImage(byte *source, Graphics::Surface &surface, uint16 cmdOffs, uint16 pixelOffs, uint16 maskOffs, uint16 lineSize) {
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uint16 width = surface.w;
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uint16 height = surface.h;
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uint16 bx = 0, by = 0, bw = ((width + 3) / 4) * 4;
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byte *cmdBuffer = source + cmdOffs;
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byte *maskBuffer = source + maskOffs;
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byte *pixelBuffer = source + pixelOffs;
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byte *destPtr = (byte*)surface.getBasePtr(0, 0);
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byte bitBuf[40];
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int bitBufLastOfs = (((lineSize + 1) >> 1) << 1) - 2;
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int bitBufLastCount = ((width + 3) >> 2) & 7;
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if (bitBufLastCount == 0)
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bitBufLastCount = 8;
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debug(1, "width = %d; bw = %d", width, bw);
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while (height > 0) {
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memcpy(bitBuf, cmdBuffer, lineSize);
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cmdBuffer += lineSize;
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for (uint16 bitBufOfs = 0; bitBufOfs < lineSize; bitBufOfs += 2) {
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uint16 bits = READ_LE_UINT16(&bitBuf[bitBufOfs]);
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int bitCount;
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if (bitBufOfs == bitBufLastOfs)
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bitCount = bitBufLastCount;
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else
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bitCount = 8;
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for (int curCmd = 0; curCmd < bitCount; curCmd++) {
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uint cmd = bits & 3;
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bits >>= 2;
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byte pixels[4], block[16];
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uint32 mask;
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switch (cmd) {
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case 0:
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pixels[0] = *pixelBuffer++;
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for (int i = 0; i < 16; i++)
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block[i] = pixels[0];
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break;
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case 1:
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pixels[0] = *pixelBuffer++;
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pixels[1] = *pixelBuffer++;
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mask = READ_LE_UINT16(maskBuffer);
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maskBuffer += 2;
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for (int i = 0; i < 16; i++) {
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block[i] = pixels[mask & 1];
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mask >>= 1;
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}
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break;
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case 2:
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pixels[0] = *pixelBuffer++;
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pixels[1] = *pixelBuffer++;
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pixels[2] = *pixelBuffer++;
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pixels[3] = *pixelBuffer++;
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mask = READ_LE_UINT32(maskBuffer);
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maskBuffer += 4;
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for (int i = 0; i < 16; i++) {
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block[i] = pixels[mask & 3];
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mask >>= 2;
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}
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break;
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case 3:
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break;
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}
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if (cmd != 3) {
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uint16 blockPos = 0;
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uint32 maxW = MIN(4, surface.w - bx);
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uint32 maxH = (MIN(4, surface.h - by) + by) * width;
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for (uint32 yc = by * width; yc < maxH; yc += width) {
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for (uint32 xc = 0; xc < maxW; xc++) {
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destPtr[(bx + xc) + yc] = block[xc + blockPos];
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}
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blockPos += 4;
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}
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}
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bx += 4;
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if (bx >= bw) {
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bx = 0;
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by += 4;
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}
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}
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}
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height -= 4;
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}
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}
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} // End of namespace Made
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