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