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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 "image/codecs/jyv1.h"
#include "common/stream.h"
#include "common/bitstream.h"
#include "common/memstream.h"
#include "common/util.h"
#include "common/textconsole.h"
#include "common/system.h"
#include "common/debug.h"
#include "graphics/surface.h"
#define ID_JYV1 MKTAG('J','Y','V','1')
#define ID_RRV1 MKTAG('R','R','V','1')
#define ID_RRV2 MKTAG('R','R','V','2')
namespace Image {
/*static*/
bool JYV1Decoder::isJYV1StreamTag(uint32 streamTag) {
return (streamTag == ID_JYV1 || streamTag == ID_RRV1 || streamTag == ID_RRV2);
}
JYV1Decoder::JYV1Decoder(int width, int height, uint32 streamTag) : Codec(),
_width(width), _height(height), _streamType(streamTag) {
assert(isJYV1StreamTag(streamTag));
_surface.create(_width, _height, getPixelFormat());
}
JYV1Decoder::~JYV1Decoder() {
_surface.free();
}
static const uint32 BASE_LEN[] = {0, 1 << 7, 1 << 3, 0, 1 << 1, 0, 1 << 5, 0,
1, 1 << 8, 1 << 4, 0, 1 << 2, 0, 1 << 6, 0};
static const uint32 FINE_LEN_BITS[] = {0, 7, 3, 0, 1, 16, 5, 0,
1, 8, 4, 0, 2, 24, 6, 0};
/**
* Details of this decoding algorithm are here:
* https://wiki.multimedia.cx/index.php/Origin_Flic_Codec
*/
const Graphics::Surface *JYV1Decoder::decodeFrame(Common::SeekableReadStream &stream) {
byte *dst = (byte *)_surface.getPixels();
uint32 offsets[16]; // RRV2 has 15 block offsets, others have 5
const int numOffsets = (_streamType == ID_RRV2 ? 15 : 5);
const int blockHeight = _height / numOffsets;
const int startOffset = stream.pos();
// Read in the block offsets and convert to stream offsets
for (int i = 0; i < numOffsets; i++) {
offsets[i] = stream.readUint32LE() + startOffset;
}
int y = 0;
int x = 0;
bool upscale = false;
for (int i = 0; i < numOffsets; i++) {
stream.seek(offsets[i], SEEK_SET);
const int cmdLen = stream.readUint32LE();
// TODO: can probably avoid this copy to make it faster
uint8 *cmdData = new uint8[cmdLen];
stream.read(cmdData, cmdLen);
Common::BitStreamMemoryStream cmdMemStream(cmdData, cmdLen);
Common::BitStreamMemory8MSB cmdBitStream(cmdMemStream);
bool skipping = true;
while (!cmdBitStream.eos()) {
uint32 idx = cmdBitStream.getBits(4);
uint32 blocksize = BASE_LEN[idx];
if (idx != 0 && idx != 8) {
blocksize += cmdBitStream.getBits(FINE_LEN_BITS[idx]);
}
if (skipping) {
// leave blocksize pixels unchanged
if (upscale)
blocksize *= 2;
while (blocksize) {
blocksize--;
x++;
if (x == _width) {
x = 0;
y++;
}
}
} else {
// draw blocksize pixels from data block
while (blocksize) {
// TODO: would be nicer to read these in whole scanlines.
// Also this upscale code is kinda ugly.
const uint8 p = stream.readByte();
dst[y * _width + x] = p;
x++;
if (x == _width) {
x = 0;
y++;
}
if (upscale) {
dst[y * _width + x] = p;
x++;
if (x == _width) {
x = 0;
y++;
}
}
blocksize--;
}
}
skipping = !skipping;
}
// Slight HACK - if we only used half the expected height, then
// this frame should be upscaled. Go back and do it again.
if (!upscale && y == blockHeight / 2) {
y = 0;
i--;
upscale = true;
}
delete [] cmdData;
}
return &_surface;
}
Graphics::PixelFormat JYV1Decoder::getPixelFormat() const {
return Graphics::PixelFormat::createFormatCLUT8();
}
} // End of namespace Image
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