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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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#include "cryomni3d/image/hnm.h"
#include "common/stream.h"
#include "common/substream.h"
#include "common/textconsole.h"
#include "graphics/pixelformat.h"
#include "graphics/surface.h"
#include "image/codecs/codec.h"
#include "image/codecs/hnm.h"
namespace Image {
HNMFileDecoder::HNMFileDecoder(const Graphics::PixelFormat &format) :
_format(format), _surface(nullptr), _codec(nullptr) {
}
HNMFileDecoder::~HNMFileDecoder() {
destroy();
}
void HNMFileDecoder::destroy() {
delete _codec;
_codec = nullptr;
_surface = nullptr;
}
bool HNMFileDecoder::loadStream(Common::SeekableReadStream &stream) {
destroy();
uint32 tag = stream.readUint32BE();
/* Only HNM6 for HNM images */
if (tag != MKTAG('H', 'N', 'M', '6')) {
return false;
}
//uint16 ukn = stream.readUint16BE();
//byte audioflags = stream.readByte();
//byte bpp = stream.readByte();
stream.skip(4);
uint16 width = stream.readUint16LE();
uint16 height = stream.readUint16LE();
//uint32 filesize = stream.readUint32LE();
//uint32 numframes = stream.readUint32LE();
//uint32 ukn2 = stream.readUint32LE();
//uint16 speed = stream.readUint16LE();
//uint16 maxbuffer = stream.readUint16LE();
//uint32 buffer_size = stream.readUint32LE();
//byte unknownStr[16];
//byte copyright[16];
//stream.read(unknownStr, sizeof(unknownStr));
//stream.read(copyright, sizeof(copyright));
stream.skip(52);
if (width == 0 || height == 0) {
return false;
}
// Read frame header
uint32 frameSize = stream.readUint32LE();
if (frameSize < 12) {
return false;
}
frameSize -= 4;
// Read chunk header
uint32 chunkSize = stream.readUint32LE();
uint16 chunkTag = stream.readUint16BE();
//uint16 chunkUkn = stream.readUint16LE();
stream.skip(2);
if (frameSize < chunkSize ||
chunkSize < 8 + 24) {
return false;
}
bool warp;
if (chunkTag == MKTAG16('I', 'W')) {
warp = true;
} else if (chunkTag == MKTAG16('I', 'X')) {
warp = false;
} else {
return false;
}
// buffer_size is not reliable on IW and we already have the real size of the image source
_codec = createHNM6Decoder(width, height, _format, chunkSize, false);
_codec->setWarpMode(warp);
_surface = _codec->decodeFrame(stream);
return true;
}
} // End of namespace Image
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