nbfs.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 <cstring>

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

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

namespace Graphics {

NBFS::NBFS(Common::SeekableReadStream &nbfs, Common::SeekableReadStream &nbfp,
           uint32 width, uint32 height) {

    load(nbfs, nbfp, width, height);
}

NBFS::~NBFS() {
}

void NBFS::load(Common::SeekableReadStream &nbfs, Common::SeekableReadStream &nbfp,
                uint32 width, uint32 height) {

    try {
        if (nbfs.size() != (width * height))
            throw Common::Exception("Dimensions mismatch (%u * %u != %u)", width, height, (uint)nbfs.size());

        if ((width >= 0x8000) || (height >= 0x8000))
            throw Common::Exception("Invalid dimensions of %ux%u", width, height);

        if (nbfp.size() > 512)
            throw Common::Exception("Too much palette data (%u bytes)", (uint)nbfp.size());

        Common::ScopedArray<const byte> palette(readPalette(nbfp));
        readImage(nbfs, palette.get(), width, height);

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

const byte *NBFS::readPalette(Common::SeekableReadStream &nbfp) {
    Common::ScopedArray<byte> palette(new byte[768]);
    std::memset(palette.get(), 0, 768);

    const size_t count = MIN<size_t>(nbfp.size() / 2, 256) * 3;
    for (size_t i = 0; i < count; i += 3) {
        const uint16 color = nbfp.readUint16LE();

        palette[i + 0] = ((color >> 10) & 0x1F) << 3;
        palette[i + 1] = ((color >>  5) & 0x1F) << 3;
        palette[i + 2] = ( color        & 0x1F) << 3;
    }

    return palette.release();
}

void NBFS::readImage(Common::SeekableReadStream &nbfs, const byte *palette,
                     uint32 width, uint32 height) {

    _format    = kPixelFormatBGRA;
    _formatRaw = kPixelFormatRGBA8;
    _dataType  = kPixelDataType8;

    _mipMaps.push_back(new MipMap);

    _mipMaps.back()->width  = width;
    _mipMaps.back()->height = height;
    _mipMaps.back()->size   = width * height * 4;

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

    bool is0Transp = (palette[0] == 0xF8) && (palette[1] == 0x00) && (palette[2] == 0xF8);

    byte *data = _mipMaps.back()->data.get();
    for (uint32 i = 0; i < (width * height); i++, data += 4) {
        uint8 pixel = nbfs.readByte();

        data[0] = palette[pixel * 3 + 0];
        data[1] = palette[pixel * 3 + 1];
        data[2] = palette[pixel * 3 + 2];
        data[3] = ((pixel == 0) && is0Transp) ? 0x00 : 0xFF;
    }
}

} // End of namespace Graphics