mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-17 15:18:11 +00:00
322 lines
8.5 KiB
C++
322 lines
8.5 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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*/
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#include "video/flic_decoder.h"
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#include "common/endian.h"
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#include "common/rect.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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namespace Video {
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FlicDecoder::FlicDecoder() {
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_paletteChanged = false;
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_fileStream = 0;
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_surface = 0;
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}
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FlicDecoder::~FlicDecoder() {
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close();
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}
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bool FlicDecoder::loadStream(Common::SeekableReadStream *stream) {
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close();
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_fileStream = stream;
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/* uint32 frameSize = */ _fileStream->readUint32LE();
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uint16 frameType = _fileStream->readUint16LE();
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// Check FLC magic number
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if (frameType != 0xAF12) {
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warning("FlicDecoder::FlicDecoder(): attempted to load non-FLC data (type = 0x%04X)", frameType);
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delete _fileStream;
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_fileStream = 0;
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return false;
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}
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_frameCount = _fileStream->readUint16LE();
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uint16 width = _fileStream->readUint16LE();
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uint16 height = _fileStream->readUint16LE();
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uint16 colorDepth = _fileStream->readUint16LE();
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if (colorDepth != 8) {
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warning("FlicDecoder::FlicDecoder(): attempted to load an FLC with a palette of color depth %d. Only 8-bit color palettes are supported", frameType);
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delete _fileStream;
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_fileStream = 0;
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return false;
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}
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_fileStream->readUint16LE(); // flags
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// Note: The normal delay is a 32-bit integer (dword), whereas the overridden delay is a 16-bit integer (word)
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// the frame delay is the FLIC "speed", in milliseconds.
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_frameRate = Common::Rational(1000, _fileStream->readUint32LE());
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_fileStream->seek(80);
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_offsetFrame1 = _fileStream->readUint32LE();
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_offsetFrame2 = _fileStream->readUint32LE();
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_surface = new Graphics::Surface();
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_surface->create(width, height, Graphics::PixelFormat::createFormatCLUT8());
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_palette = (byte *)malloc(3 * 256);
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memset(_palette, 0, 3 * 256);
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_paletteChanged = false;
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// Seek to the first frame
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_fileStream->seek(_offsetFrame1);
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return true;
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}
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void FlicDecoder::close() {
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if (!_fileStream)
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return;
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delete _fileStream;
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_fileStream = 0;
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_surface->free();
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delete _surface;
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_surface = 0;
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free(_palette);
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_dirtyRects.clear();
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reset();
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}
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void FlicDecoder::decodeByteRun(uint8 *data) {
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byte *ptr = (byte *)_surface->pixels;
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while ((int32)(ptr - (byte *)_surface->pixels) < (getWidth() * getHeight())) {
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int chunks = *data++;
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while (chunks--) {
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int count = (int8)*data++;
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if (count > 0) {
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memset(ptr, *data++, count);
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} else {
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count = -count;
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memcpy(ptr, data, count);
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data += count;
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}
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ptr += count;
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}
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}
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// Redraw
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_dirtyRects.clear();
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_dirtyRects.push_back(Common::Rect(0, 0, getWidth(), getHeight()));
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}
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#define OP_PACKETCOUNT 0
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#define OP_UNDEFINED 1
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#define OP_LASTPIXEL 2
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#define OP_LINESKIPCOUNT 3
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void FlicDecoder::decodeDeltaFLC(uint8 *data) {
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uint16 linesInChunk = READ_LE_UINT16(data); data += 2;
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uint16 currentLine = 0;
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uint16 packetCount = 0;
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while (linesInChunk--) {
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uint16 opcode;
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// First process all the opcodes.
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do {
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opcode = READ_LE_UINT16(data); data += 2;
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switch ((opcode >> 14) & 3) {
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case OP_PACKETCOUNT:
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packetCount = opcode;
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break;
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case OP_UNDEFINED:
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break;
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case OP_LASTPIXEL:
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*((byte *)_surface->pixels + currentLine * getWidth() + getWidth() - 1) = (opcode & 0xFF);
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_dirtyRects.push_back(Common::Rect(getWidth() - 1, currentLine, getWidth(), currentLine + 1));
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break;
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case OP_LINESKIPCOUNT:
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currentLine += -(int16)opcode;
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break;
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}
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} while (((opcode >> 14) & 3) != OP_PACKETCOUNT);
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uint16 column = 0;
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// Now interpret the RLE data
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while (packetCount--) {
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column += *data++;
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int rleCount = (int8)*data++;
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if (rleCount > 0) {
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memcpy((byte *)_surface->pixels + (currentLine * getWidth()) + column, data, rleCount * 2);
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data += rleCount * 2;
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_dirtyRects.push_back(Common::Rect(column, currentLine, column + rleCount * 2, currentLine + 1));
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} else if (rleCount < 0) {
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rleCount = -rleCount;
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uint16 dataWord = READ_UINT16(data); data += 2;
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for (int i = 0; i < rleCount; ++i) {
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WRITE_UINT16((byte *)_surface->pixels + currentLine * getWidth() + column + i * 2, dataWord);
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}
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_dirtyRects.push_back(Common::Rect(column, currentLine, column + rleCount * 2, currentLine + 1));
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} else { // End of cutscene ?
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return;
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}
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column += rleCount * 2;
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}
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currentLine++;
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}
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}
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#define FLI_SETPAL 4
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#define FLI_SS2 7
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#define FLI_BRUN 15
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#define PSTAMP 18
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#define FRAME_TYPE 0xF1FA
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const Graphics::Surface *FlicDecoder::decodeNextFrame() {
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// Read chunk
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uint32 frameSize = _fileStream->readUint32LE();
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uint16 frameType = _fileStream->readUint16LE();
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uint16 chunkCount = 0;
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switch (frameType) {
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case FRAME_TYPE:
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{
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// FIXME: FLIC should be switched over to a variable frame rate VideoDecoder to handle
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// this properly.
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chunkCount = _fileStream->readUint16LE();
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// Note: The overridden delay is a 16-bit integer (word), whereas the normal delay is a 32-bit integer (dword)
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// the frame delay is the FLIC "speed", in milliseconds.
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uint16 newFrameDelay = _fileStream->readUint16LE(); // "speed", in milliseconds
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if (newFrameDelay > 0)
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_frameRate = Common::Rational(1000, newFrameDelay);
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_fileStream->readUint16LE(); // reserved, always 0
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uint16 newWidth = _fileStream->readUint16LE();
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uint16 newHeight = _fileStream->readUint16LE();
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if ((newWidth != 0) && (newHeight != 0)) {
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if (newWidth == 0)
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newWidth = _surface->w;
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if (newHeight == 0)
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newHeight = _surface->h;
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_surface->free();
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delete _surface;
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_surface = new Graphics::Surface();
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_surface->create(newWidth, newHeight, Graphics::PixelFormat::createFormatCLUT8());
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}
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}
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break;
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default:
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error("FlicDecoder::decodeFrame(): unknown main chunk type (type = 0x%02X)", frameType);
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break;
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}
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// Read subchunks
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if (frameType == FRAME_TYPE) {
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for (uint32 i = 0; i < chunkCount; ++i) {
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frameSize = _fileStream->readUint32LE();
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frameType = _fileStream->readUint16LE();
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uint8 *data = new uint8[frameSize - 6];
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_fileStream->read(data, frameSize - 6);
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switch (frameType) {
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case FLI_SETPAL:
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unpackPalette(data);
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_paletteChanged = true;
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break;
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case FLI_SS2:
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decodeDeltaFLC(data);
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break;
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case FLI_BRUN:
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decodeByteRun(data);
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break;
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case PSTAMP:
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/* PSTAMP - skip for now */
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break;
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default:
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error("FlicDecoder::decodeNextFrame(): unknown subchunk type (type = 0x%02X)", frameType);
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break;
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}
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delete[] data;
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}
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}
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_curFrame++;
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// If we just processed the ring frame, set the next frame
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if (_curFrame == (int32)_frameCount) {
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_curFrame = 0;
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_fileStream->seek(_offsetFrame2);
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}
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if (_curFrame == 0)
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_startTime = g_system->getMillis();
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return _surface;
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}
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void FlicDecoder::reset() {
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FixedRateVideoDecoder::reset();
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if (_fileStream)
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_fileStream->seek(_offsetFrame1);
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}
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void FlicDecoder::unpackPalette(uint8 *data) {
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uint16 numPackets = READ_LE_UINT16(data); data += 2;
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if (0 == READ_LE_UINT16(data)) { //special case
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data += 2;
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for (int i = 0; i < 256; ++i) {
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memcpy(_palette + i * 3, data + i * 3, 3);
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}
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} else {
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uint8 palPos = 0;
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while (numPackets--) {
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palPos += *data++;
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uint8 change = *data++;
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for (int i = 0; i < change; ++i) {
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memcpy(_palette + (palPos + i) * 3, data + i * 3, 3);
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}
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palPos += change;
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data += (change * 3);
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}
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}
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}
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void FlicDecoder::copyDirtyRectsToBuffer(uint8 *dst, uint pitch) {
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for (Common::List<Common::Rect>::const_iterator it = _dirtyRects.begin(); it != _dirtyRects.end(); ++it) {
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for (int y = (*it).top; y < (*it).bottom; ++y) {
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const int x = (*it).left;
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memcpy(dst + y * pitch + x, (byte *)_surface->pixels + y * getWidth() + x, (*it).right - x);
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}
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}
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_dirtyRects.clear();
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}
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} // End of namespace Video
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