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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program 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 program 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 program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "mutationofjb/animationdecoder.h"
#include "mutationofjb/encryptedfile.h"
#include "mutationofjb/util.h"
#include "common/debug.h"
namespace MutationOfJB {
AnimationDecoder::AnimationDecoder(const Common::String &fileName) : _fileName(fileName) {
_surface.create(IMAGE_WIDTH, IMAGE_HEIGHT, Graphics::PixelFormat::createFormatCLUT8());
}
bool AnimationDecoder::decode(AnimationDecoderCallback *callback) {
EncryptedFile file;
file.open(_fileName);
if (!file.isOpen()) {
reportFileMissingError(_fileName.c_str());
return false;
}
file.seek(0, SEEK_END);
const int32 endPos = file.pos();
// Skip header - we don't need it anyway.
file.seek(0x80);
int frameNo = 0;
while (file.pos() != endPos) {
// Record.
const uint32 length = file.readUint32LE();
const uint16 recordId = file.readUint16LE();
const uint16 subrecords = file.readUint16LE();
// Skip 8 empty bytes.
file.seek(8, SEEK_CUR);
// Subrecords.
if (recordId == 0xF1FA) {
if (subrecords == 0) {
if (callback) {
callback->onFrame(frameNo, _surface); // Empty record, frame identical to the previous one.
}
} else {
for (int i = 0; i < subrecords; ++i) {
int32 filePos = file.pos();
const uint32 subLength = file.readUint32LE();
const uint16 type = file.readUint16LE();
if (type == 0x0B) {
loadPalette(file);
if (callback) {
callback->onPaletteUpdated(_palette);
}
} else if (type == 0x0F) {
loadFullFrame(file, subLength - 6);
if (callback) {
callback->onFrame(frameNo, _surface);
}
} else if (type == 0x0C) {
loadDiffFrame(file, subLength - 6);
if (callback) {
callback->onFrame(frameNo, _surface);
}
} else {
debug("Unsupported record type %02X.", type);
file.seek(subLength - 6, SEEK_CUR);
}
// Makes decoding more robust, because for some reason records might have extra data at the end.
file.seek(filePos + subLength, SEEK_SET);
}
}
frameNo++;
} else {
file.seek(length - 16, SEEK_CUR);
}
}
file.close();
return true;
}
void AnimationDecoder::loadPalette(Common::SeekableReadStream &file) {
uint16 packets = file.readUint16LE();
const uint8 skipCount = file.readByte();
int copyCount = file.readByte();
if (copyCount == 0) {
copyCount = PALETTE_COLORS;
}
while (packets--) {
file.read(_palette + skipCount * 3, copyCount * 3);
for (int j = skipCount * 3; j < (skipCount + copyCount) * 3; ++j) {
_palette[j] <<= 2; // Uses 6-bit colors.
}
}
}
void AnimationDecoder::loadFullFrame(EncryptedFile &file, uint32 size) {
uint8 *const pixels = reinterpret_cast<uint8 *>(_surface.getPixels());
uint8 *ptr = pixels;
uint32 readBytes = 0;
uint32 lines = 0;
while (readBytes != size) {
if (lines == 200) {
// Some full frames have an unknown byte at the end,
// so break when we encounter all 200 lines.
break;
}
uint8 no = file.readByte();
readBytes++;
while (no--) {
uint8 n = file.readByte();
readBytes++;
if (n < 0x80) {
// RLE - Copy color n times.
uint8 color = file.readByte();
readBytes++;
while (n--) {
*ptr++ = color;
}
} else {
// Take next 0x100 - n bytes as they are.
const uint32 rawlen = 0x100 - n;
file.read(ptr, rawlen);
readBytes += rawlen;
ptr += rawlen;
}
}
lines++;
}
}
void AnimationDecoder::loadDiffFrame(EncryptedFile &file, uint32) {
const uint16 firstLine = file.readUint16LE();
const uint16 numLines = file.readUint16LE();
for (uint16 line = firstLine; line < firstLine + numLines; ++line) {
uint8 *imageData = reinterpret_cast<uint8 *>(_surface.getBasePtr(0, line));
uint8 runs = file.readByte();
while (runs--) {
uint8 localOffset = file.readByte();
uint8 num = file.readByte();
imageData += localOffset;
if (num == 0) {
// Ignore?
debug("Zero RLE number found.");
} else if (num < 0x80) {
file.read(imageData, num);
imageData += num;
} else {
const uint8 color = file.readByte();
const int no = 0x100 - num;
memset(imageData, color, no);
imageData += no;
}
}
}
}
AnimationDecoder::~AnimationDecoder() {
_surface.free();
}
}
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