xoreositex.cpp

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/* xoreos - A reimplementation of BioWare's Aurora engine
 *
 * xoreos is the legal property of its developers, whose names
 * can be found in the AUTHORS file distributed with this source
 * distribution.
 *
 * xoreos 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.
 *
 * xoreos 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 xoreos. If not, see <http://www.gnu.org/licenses/>.
 */

#include "src/common/util.h"
#include "src/common/strutil.h"
#include "src/common/readstream.h"
#include "src/common/error.h"

#include "src/graphics/images/xoreositex.h"

static const uint32 kXEOSID = MKTAG('X', 'E', 'O', 'S');
static const uint32 kITEXID = MKTAG('I', 'T', 'E', 'X');

namespace Graphics {

XEOSITEX::XEOSITEX(Common::SeekableReadStream &xeositex) {
    load(xeositex);
}

XEOSITEX::~XEOSITEX() {
}

void XEOSITEX::load(Common::SeekableReadStream &xeositex) {
    try {

        readHeader(xeositex);
        readMipMaps(xeositex);

    } catch (Common::Exception &e) {
        e.add("Failed reading XEOSITEX file");
        throw;
    }
}

void XEOSITEX::readHeader(Common::SeekableReadStream &xeositex) {
    const uint32 magic1 = xeositex.readUint32BE();
    const uint32 magic2 = xeositex.readUint32BE();
    if ((magic1 != kXEOSID) || (magic2 != kITEXID))
        throw Common::Exception("Not a valid XEOSITEX (%s, %s)",
                Common::debugTag(magic1).c_str(), Common::debugTag(magic2).c_str());

    const uint32 version = xeositex.readUint32LE();
    if (version != 0)
        throw Common::Exception("Invalid XEOSITEX version %u", version);

    const uint32 pixelFormat = xeositex.readUint32LE();
    if ((pixelFormat != 3) && (pixelFormat != 4))
        throw Common::Exception("Invalid XEOSITEX pixel format %u", pixelFormat);

    if        (pixelFormat == 3) {
        _format    = kPixelFormatBGR;
        _formatRaw = kPixelFormatRGB8;
        _dataType  = kPixelDataType8;
        _hasAlpha  = false;
    } else if (pixelFormat == 4) {
        _format    = kPixelFormatBGRA;
        _formatRaw = kPixelFormatRGBA8;
        _dataType  = kPixelDataType8;
        _hasAlpha  = true;
    }

    _wrapX = xeositex.readByte() != 0;
    _wrapY = xeositex.readByte() != 0;
    _flipX = xeositex.readByte() != 0;
    _flipY = xeositex.readByte() != 0;

    _coordTransform = xeositex.readByte();

    _txi.getFeatures().filter = xeositex.readByte() != 0;

    const uint32 mipMaps = xeositex.readUint32LE();
    _mipMaps.resize(mipMaps, 0);
}

void XEOSITEX::readMipMaps(Common::SeekableReadStream &xeositex) {
    for (size_t i = 0; i < _mipMaps.size(); i++) {
        _mipMaps[i] = new MipMap(this);

        _mipMaps[i]->width  = xeositex.readUint32LE();
        _mipMaps[i]->height = xeositex.readUint32LE();
        _mipMaps[i]->size   = xeositex.readUint32LE();

        _mipMaps[i]->data.reset(new byte[_mipMaps[i]->size]);

        if (xeositex.read(_mipMaps[i]->data.get(), _mipMaps[i]->size) != _mipMaps[i]->size)
            throw Common::Exception(Common::kReadError);
    }
}

} // End of namespace Graphics