QtX11ImageConversion.cpp   [plain text]

/*
 * Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this program; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#include "config.h"
#include "QtX11ImageConversion.h"

namespace WebCore {

QImage qimageFromXImage(XImage* xi)
{
    QImage::Format format = QImage::Format_ARGB32_Premultiplied;
    if (xi->depth == 24)
        format = QImage::Format_RGB32;
    else if (xi->depth == 16)
        format = QImage::Format_RGB16;

    QImage image = QImage(reinterpret_cast<uchar*>(xi->data), xi->width, xi->height, xi->bytes_per_line, format).copy();

    // we may have to swap the byte order
    if ((QSysInfo::ByteOrder == QSysInfo::LittleEndian && xi->byte_order == MSBFirst)
        || (QSysInfo::ByteOrder == QSysInfo::BigEndian && xi->byte_order == LSBFirst)) {

        for (int i = 0; i < image.height(); i++) {
            if (xi->depth == 16) {
                ushort* p = reinterpret_cast<ushort*>(image.scanLine(i));
                ushort* end = p + image.width();
                while (p < end) {
                    *p = ((*p << 8) & 0xff00) | ((*p >> 8) & 0x00ff);
                    p++;
                }
            } else {
                uint* p = reinterpret_cast<uint*>(image.scanLine(i));
                uint* end = p + image.width();
                while (p < end) {
                    *p = ((*p << 24) & 0xff000000) | ((*p << 8) & 0x00ff0000)
                         | ((*p >> 8) & 0x0000ff00) | ((*p >> 24) & 0x000000ff);
                    p++;
                }
            }
        }
    }

    // fix-up alpha channel
    if (format == QImage::Format_RGB32) {
        QRgb* p = reinterpret_cast<QRgb*>(image.bits());
        for (int y = 0; y < xi->height; ++y) {
            for (int x = 0; x < xi->width; ++x)
                p[x] |= 0xff000000;
            p += xi->bytes_per_line / 4;
        }
    }

    return image;
}

} // namespace WebKit