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https://github.com/libretro/scummvm.git
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315 lines
11 KiB
C++
315 lines
11 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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*
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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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*
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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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*/
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#include "image/codecs/cinepak.h"
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#include "common/debug.h"
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#include "common/stream.h"
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#include "common/system.h"
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#include "common/textconsole.h"
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#include "common/util.h"
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#include "graphics/surface.h"
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// Code here partially based off of ffmpeg ;)
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namespace Image {
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#define PUT_PIXEL(offset, lum, u, v) \
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if (_pixelFormat.bytesPerPixel != 1) { \
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byte r = _clipTable[lum + (v << 1)]; \
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byte g = _clipTable[lum - (u >> 1) - v]; \
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byte b = _clipTable[lum + (u << 1)]; \
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\
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if (_pixelFormat.bytesPerPixel == 2) \
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*((uint16 *)_curFrame.surface->getPixels() + offset) = _pixelFormat.RGBToColor(r, g, b); \
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else \
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*((uint32 *)_curFrame.surface->getPixels() + offset) = _pixelFormat.RGBToColor(r, g, b); \
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} else \
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*((byte *)_curFrame.surface->getPixels() + offset) = lum
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CinepakDecoder::CinepakDecoder(int bitsPerPixel) : Codec() {
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_curFrame.surface = NULL;
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_curFrame.strips = NULL;
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_y = 0;
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if (bitsPerPixel == 8) {
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_pixelFormat = Graphics::PixelFormat::createFormatCLUT8();
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} else {
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_pixelFormat = g_system->getScreenFormat();
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// Default to a 32bpp format, if in 8bpp mode
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if (_pixelFormat.bytesPerPixel == 1)
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_pixelFormat = Graphics::PixelFormat(4, 8, 8, 8, 8, 8, 16, 24, 0);
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}
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// Create a lookup for the clip function
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// This dramatically improves the performance of the color conversion
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_clipTableBuf = new byte[1024];
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for (uint i = 0; i < 1024; i++) {
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if (i <= 512)
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_clipTableBuf[i] = 0;
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else if (i >= 768)
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_clipTableBuf[i] = 255;
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else
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_clipTableBuf[i] = i - 512;
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}
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_clipTable = _clipTableBuf + 512;
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}
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CinepakDecoder::~CinepakDecoder() {
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if (_curFrame.surface) {
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_curFrame.surface->free();
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delete _curFrame.surface;
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}
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delete[] _curFrame.strips;
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delete[] _clipTableBuf;
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}
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const Graphics::Surface *CinepakDecoder::decodeFrame(Common::SeekableReadStream &stream) {
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_curFrame.flags = stream.readByte();
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_curFrame.length = (stream.readByte() << 16);
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_curFrame.length |= stream.readUint16BE();
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_curFrame.width = stream.readUint16BE();
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_curFrame.height = stream.readUint16BE();
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_curFrame.stripCount = stream.readUint16BE();
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if (_curFrame.strips == NULL)
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_curFrame.strips = new CinepakStrip[_curFrame.stripCount];
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debug(4, "Cinepak Frame: Width = %d, Height = %d, Strip Count = %d", _curFrame.width, _curFrame.height, _curFrame.stripCount);
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// Borrowed from FFMPEG. This should cut out the extra data Cinepak for Sega has (which is useless).
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// The theory behind this is that this is here to confuse standard Cinepak decoders. But, we won't let that happen! ;)
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if (_curFrame.length != (uint32)stream.size()) {
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if (stream.readUint16BE() == 0xFE00)
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stream.readUint32BE();
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else if ((stream.size() % _curFrame.length) == 0)
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stream.seek(-2, SEEK_CUR);
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}
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if (!_curFrame.surface) {
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_curFrame.surface = new Graphics::Surface();
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_curFrame.surface->create(_curFrame.width, _curFrame.height, _pixelFormat);
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}
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// Reset the y variable.
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_y = 0;
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for (uint16 i = 0; i < _curFrame.stripCount; i++) {
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if (i > 0 && !(_curFrame.flags & 1)) { // Use codebooks from last strip
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for (uint16 j = 0; j < 256; j++) {
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_curFrame.strips[i].v1_codebook[j] = _curFrame.strips[i - 1].v1_codebook[j];
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_curFrame.strips[i].v4_codebook[j] = _curFrame.strips[i - 1].v4_codebook[j];
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}
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}
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_curFrame.strips[i].id = stream.readUint16BE();
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_curFrame.strips[i].length = stream.readUint16BE() - 12; // Subtract the 12 byte header
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_curFrame.strips[i].rect.top = _y; stream.readUint16BE(); // Ignore, substitute with our own.
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_curFrame.strips[i].rect.left = 0; stream.readUint16BE(); // Ignore, substitute with our own
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_curFrame.strips[i].rect.bottom = _y + stream.readUint16BE();
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_curFrame.strips[i].rect.right = _curFrame.width; stream.readUint16BE(); // Ignore, substitute with our own
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// Sanity check. Because Cinepak is based on 4x4 blocks, the width and height of each strip needs to be divisible by 4.
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assert(!(_curFrame.strips[i].rect.width() % 4) && !(_curFrame.strips[i].rect.height() % 4));
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uint32 pos = stream.pos();
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while ((uint32)stream.pos() < (pos + _curFrame.strips[i].length) && !stream.eos()) {
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byte chunkID = stream.readByte();
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if (stream.eos())
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break;
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// Chunk Size is 24-bit, ignore the first 4 bytes
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uint32 chunkSize = stream.readByte() << 16;
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chunkSize += stream.readUint16BE() - 4;
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int32 startPos = stream.pos();
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switch (chunkID) {
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case 0x20:
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case 0x21:
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case 0x24:
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case 0x25:
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loadCodebook(stream, i, 4, chunkID, chunkSize);
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break;
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case 0x22:
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case 0x23:
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case 0x26:
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case 0x27:
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loadCodebook(stream, i, 1, chunkID, chunkSize);
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break;
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case 0x30:
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case 0x31:
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case 0x32:
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decodeVectors(stream, i, chunkID, chunkSize);
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break;
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default:
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warning("Unknown Cinepak chunk ID %02x", chunkID);
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return _curFrame.surface;
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}
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if (stream.pos() != startPos + (int32)chunkSize)
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stream.seek(startPos + chunkSize);
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}
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_y = _curFrame.strips[i].rect.bottom;
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}
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return _curFrame.surface;
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}
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void CinepakDecoder::loadCodebook(Common::SeekableReadStream &stream, uint16 strip, byte codebookType, byte chunkID, uint32 chunkSize) {
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CinepakCodebook *codebook = (codebookType == 1) ? _curFrame.strips[strip].v1_codebook : _curFrame.strips[strip].v4_codebook;
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int32 startPos = stream.pos();
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uint32 flag = 0, mask = 0;
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for (uint16 i = 0; i < 256; i++) {
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if ((chunkID & 0x01) && !(mask >>= 1)) {
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if ((stream.pos() - startPos + 4) > (int32)chunkSize)
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break;
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flag = stream.readUint32BE();
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mask = 0x80000000;
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}
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if (!(chunkID & 0x01) || (flag & mask)) {
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byte n = (chunkID & 0x04) ? 4 : 6;
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if ((stream.pos() - startPos + n) > (int32)chunkSize)
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break;
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for (byte j = 0; j < 4; j++)
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codebook[i].y[j] = stream.readByte();
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if (n == 6) {
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codebook[i].u = stream.readSByte();
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codebook[i].v = stream.readSByte();
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} else {
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// This codebook type indicates either greyscale or
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// palettized video. For greyscale, default us to
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// 0 for both u and v.
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codebook[i].u = 0;
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codebook[i].v = 0;
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}
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}
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}
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}
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void CinepakDecoder::decodeVectors(Common::SeekableReadStream &stream, uint16 strip, byte chunkID, uint32 chunkSize) {
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uint32 flag = 0, mask = 0;
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uint32 iy[4];
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int32 startPos = stream.pos();
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for (uint16 y = _curFrame.strips[strip].rect.top; y < _curFrame.strips[strip].rect.bottom; y += 4) {
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iy[0] = _curFrame.strips[strip].rect.left + y * _curFrame.width;
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iy[1] = iy[0] + _curFrame.width;
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iy[2] = iy[1] + _curFrame.width;
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iy[3] = iy[2] + _curFrame.width;
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for (uint16 x = _curFrame.strips[strip].rect.left; x < _curFrame.strips[strip].rect.right; x += 4) {
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if ((chunkID & 0x01) && !(mask >>= 1)) {
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if ((stream.pos() - startPos + 4) > (int32)chunkSize)
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return;
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flag = stream.readUint32BE();
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mask = 0x80000000;
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}
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if (!(chunkID & 0x01) || (flag & mask)) {
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if (!(chunkID & 0x02) && !(mask >>= 1)) {
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if ((stream.pos() - startPos + 4) > (int32)chunkSize)
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return;
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flag = stream.readUint32BE();
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mask = 0x80000000;
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}
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if ((chunkID & 0x02) || (~flag & mask)) {
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if ((stream.pos() - startPos + 1) > (int32)chunkSize)
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return;
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// Get the codebook
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CinepakCodebook codebook = _curFrame.strips[strip].v1_codebook[stream.readByte()];
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PUT_PIXEL(iy[0] + 0, codebook.y[0], codebook.u, codebook.v);
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PUT_PIXEL(iy[0] + 1, codebook.y[0], codebook.u, codebook.v);
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PUT_PIXEL(iy[1] + 0, codebook.y[0], codebook.u, codebook.v);
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PUT_PIXEL(iy[1] + 1, codebook.y[0], codebook.u, codebook.v);
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PUT_PIXEL(iy[0] + 2, codebook.y[1], codebook.u, codebook.v);
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PUT_PIXEL(iy[0] + 3, codebook.y[1], codebook.u, codebook.v);
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PUT_PIXEL(iy[1] + 2, codebook.y[1], codebook.u, codebook.v);
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PUT_PIXEL(iy[1] + 3, codebook.y[1], codebook.u, codebook.v);
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PUT_PIXEL(iy[2] + 0, codebook.y[2], codebook.u, codebook.v);
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PUT_PIXEL(iy[2] + 1, codebook.y[2], codebook.u, codebook.v);
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PUT_PIXEL(iy[3] + 0, codebook.y[2], codebook.u, codebook.v);
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PUT_PIXEL(iy[3] + 1, codebook.y[2], codebook.u, codebook.v);
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PUT_PIXEL(iy[2] + 2, codebook.y[3], codebook.u, codebook.v);
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PUT_PIXEL(iy[2] + 3, codebook.y[3], codebook.u, codebook.v);
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PUT_PIXEL(iy[3] + 2, codebook.y[3], codebook.u, codebook.v);
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PUT_PIXEL(iy[3] + 3, codebook.y[3], codebook.u, codebook.v);
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} else if (flag & mask) {
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if ((stream.pos() - startPos + 4) > (int32)chunkSize)
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return;
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CinepakCodebook codebook = _curFrame.strips[strip].v4_codebook[stream.readByte()];
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PUT_PIXEL(iy[0] + 0, codebook.y[0], codebook.u, codebook.v);
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PUT_PIXEL(iy[0] + 1, codebook.y[1], codebook.u, codebook.v);
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PUT_PIXEL(iy[1] + 0, codebook.y[2], codebook.u, codebook.v);
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PUT_PIXEL(iy[1] + 1, codebook.y[3], codebook.u, codebook.v);
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codebook = _curFrame.strips[strip].v4_codebook[stream.readByte()];
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PUT_PIXEL(iy[0] + 2, codebook.y[0], codebook.u, codebook.v);
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PUT_PIXEL(iy[0] + 3, codebook.y[1], codebook.u, codebook.v);
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PUT_PIXEL(iy[1] + 2, codebook.y[2], codebook.u, codebook.v);
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PUT_PIXEL(iy[1] + 3, codebook.y[3], codebook.u, codebook.v);
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codebook = _curFrame.strips[strip].v4_codebook[stream.readByte()];
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PUT_PIXEL(iy[2] + 0, codebook.y[0], codebook.u, codebook.v);
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PUT_PIXEL(iy[2] + 1, codebook.y[1], codebook.u, codebook.v);
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PUT_PIXEL(iy[3] + 0, codebook.y[2], codebook.u, codebook.v);
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PUT_PIXEL(iy[3] + 1, codebook.y[3], codebook.u, codebook.v);
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codebook = _curFrame.strips[strip].v4_codebook[stream.readByte()];
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PUT_PIXEL(iy[2] + 2, codebook.y[0], codebook.u, codebook.v);
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PUT_PIXEL(iy[2] + 3, codebook.y[1], codebook.u, codebook.v);
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PUT_PIXEL(iy[3] + 2, codebook.y[2], codebook.u, codebook.v);
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PUT_PIXEL(iy[3] + 3, codebook.y[3], codebook.u, codebook.v);
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}
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}
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for (byte i = 0; i < 4; i++)
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iy[i] += 4;
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}
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}
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}
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} // End of namespace Image
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