qdrawhelper.cpp

奇趣公司比较新的qt/emd版本

            const uchar *scanLine = data->texture.scanLine(py);
            *b = out ? uint(0) : fetch(scanLine, px, data->texture.colorTable);
            fx += fdx;
            fy += fdy;
            fw += fdw;
            //force increment to avoid /0
            if (!fw) {
                fw += fdw;
            }
            ++b;
        }
    }

    return buffer;
}

static const uint * QT_FASTCALL fetchTransformedTiled_generic(uint *buffer, const Operator *, const QSpanData *data,
                                                              int y, int x, int length)
{
    FetchPixelProc fetch = fetchPixelProc[data->texture.format];

    int image_width = data->texture.width;
    int image_height = data->texture.height;

    // The increment pr x in the scanline
    int fdx = (int)(data->m11 * fixed_scale);
    int fdy = (int)(data->m12 * fixed_scale);
    bool affine = !data->m13 && !data->m23;

    int fx = int((data->m21 * (y + 0.5)
                  + data->m11 * (x + 0.5) + data->dx) * fixed_scale);
    int fy = int((data->m22 * (y + 0.5)
                  + data->m12 * (x + 0.5) + data->dy) * fixed_scale);

    const uint *end = buffer + length;
    uint *b = buffer;
    if (affine) {
        while (b < end) {
            int px = fx >> 16;
            int py = fy >> 16;

            px %= image_width;
            py %= image_height;
            if (px < 0) px += image_width;
            if (py < 0) py += image_height;

            const uchar *scanLine = data->texture.scanLine(py);
            *b = fetch(scanLine, px, data->texture.colorTable);
            fx += fdx;
            fy += fdy;
            ++b;
        }
    } else {
        int fdw = (int)(data->m13 * fixed_scale);
        int fw = int((data->m13 * (x + 0.5)
                     + data->m23 * (y + 0.5) + 1.) * fixed_scale);
        if (!fw)
            fw = 1;
        while (b < end) {
            int px = fx/fw;
            int py = fy/fw;

            px %= image_width;
            py %= image_height;
            if (px < 0) px += image_width;
            if (py < 0) py += image_height;

            const uchar *scanLine = data->texture.scanLine(py);
            *b = fetch(scanLine, px, data->texture.colorTable);
            fx += fdx;
            fy += fdy;
            fw += fdw;
            //force increment to avoid /0
            if (!fw) {
                fw += fdw;
            }
            ++b;
        }
    }

    return buffer;
}

static const uint * QT_FASTCALL fetchTransformedBilinear_generic(uint *buffer, const Operator *, const QSpanData *data,
                                                                 int y, int x, int length)
{
    FetchPixelProc fetch = fetchPixelProc[data->texture.format];

    int image_width = data->texture.width;
    int image_height = data->texture.height;

    // The increment pr x in the scanline
    int fdx = (int)(data->m11 * fixed_scale);
    int fdy = (int)(data->m12 * fixed_scale);
    bool affine = !data->m13 && !data->m23;

    int fx = int((data->m21 * (y + 0.5)
                  + data->m11 * (x + 0.5) + data->dx) * fixed_scale) - half_point;
    int fy = int((data->m22 * (y + 0.5)
                  + data->m12 * (x + 0.5) + data->dy) * fixed_scale) - half_point;

    const uint *end = buffer + length;
    uint *b = buffer;
    if (affine) {
        while (b < end) {
            int x1 = (fx >> 16);
            int x2 = x1 + 1;
            int y1 = (fy >> 16);
            int y2 = y1 + 1;

            int distx = ((fx - (x1 << 16)) >> 8);
            int disty = ((fy - (y1 << 16)) >> 8);
            int idistx = 256 - distx;
            int idisty = 256 - disty;

            x1 = qBound(0, x1, image_width - 1);
            x2 = qBound(0, x2, image_width - 1);
            y1 = qBound(0, y1, image_height - 1);
            y2 = qBound(0, y2, image_height - 1);

            const uchar *s1 = data->texture.scanLine(y1);
            const uchar *s2 = data->texture.scanLine(y2);

            uint tl = fetch(s1, x1, data->texture.colorTable);
            uint tr = fetch(s1, x2, data->texture.colorTable);
            uint bl = fetch(s2, x1, data->texture.colorTable);
            uint br = fetch(s2, x2, data->texture.colorTable);

            uint xtop = INTERPOLATE_PIXEL_256(tl, idistx, tr, distx);
            uint xbot = INTERPOLATE_PIXEL_256(bl, idistx, br, distx);
            *b = INTERPOLATE_PIXEL_256(xtop, idisty, xbot, disty);

            fx += fdx;
            fy += fdy;
            ++b;
        }
    } else {
        int fdw = (int)(data->m13 * fixed_scale);
        int fw = int((data->m13 * (x + 0.5)
                      + data->m23 * (y + 0.5) + 1.) * fixed_scale);
        if (!fw)
            fw = 1;
        while (b < end) {
            int x1 = fx/fw;
            int x2 = x1 + 1;
            int y1 = fy/fw;
            int y2 = y1 + 1;

            int distx = ((fx -(x1*fw)) >> 8) & 0xff;
            int disty = ((fy -(y1*fw)) >> 8) & 0xff;
            int idistx = 256 - distx;
            int idisty = 256 - disty;

            x1 = qBound(0, x1, image_width - 1);
            x2 = qBound(0, x2, image_width - 1);
            y1 = qBound(0, y1, image_height - 1);
            y2 = qBound(0, y2, image_height - 1);

            const uchar *s1 = data->texture.scanLine(y1);
            const uchar *s2 = data->texture.scanLine(y2);

            uint tl = fetch(s1, x1, data->texture.colorTable);
            uint tr = fetch(s1, x2, data->texture.colorTable);
            uint bl = fetch(s2, x1, data->texture.colorTable);
            uint br = fetch(s2, x2, data->texture.colorTable);

            uint xtop = INTERPOLATE_PIXEL_256(tl, idistx, tr, distx);
            uint xbot = INTERPOLATE_PIXEL_256(bl, idistx, br, distx);
            *b = INTERPOLATE_PIXEL_256(xtop, idisty, xbot, disty);

            fx += fdx;
            fy += fdy;
            fw += fdw;
            //force increment to avoid /0
            if (!fw) {
                fw += fdw;
            }
            ++b;
        }
    }

    return buffer;
}

static const uint * QT_FASTCALL fetchTransformedBilinearTiled_generic(uint *buffer, const Operator *, const QSpanData *data,
                                                                     int y, int x, int length)
{
    FetchPixelProc fetch = fetchPixelProc[data->texture.format];

    int image_width = data->texture.width;
    int image_height = data->texture.height;
    bool affine = !data->m13 && !data->m23;

    // The increment pr x in the scanline
    int fdx = (int)(data->m11 * fixed_scale);
    int fdy = (int)(data->m12 * fixed_scale);

    int fx = int((data->m21 * (y + 0.5)
                  + data->m11 * (x + 0.5) + data->dx) * fixed_scale) - half_point;
    int fy = int((data->m22 * (y + 0.5)
                  + data->m12 * (x + 0.5) + data->dy) * fixed_scale) - half_point;

    const uint *end = buffer + length;
    uint *b = buffer;
    if (affine) {
        while (b < end) {
            int x1 = (fx >> 16);
            int x2 = x1 + 1;
            int y1 = (fy >> 16);
            int y2 = y1 + 1;

            int distx = ((fx - (x1 << 16)) >> 8);
            int disty = ((fy - (y1 << 16)) >> 8);
            int idistx = 256 - distx;
            int idisty = 256 - disty;

            x1 %= image_width;
            x2 %= image_width;
            y1 %= image_height;
            y2 %= image_height;

            if (x1 < 0) x1 += image_width;
            if (x2 < 0) x2 += image_width;
            if (y1 < 0) y1 += image_height;
            if (y2 < 0) y2 += image_height;

            Q_ASSERT(x1 >= 0 && x1 < image_width);
            Q_ASSERT(x2 >= 0 && x2 < image_width);
            Q_ASSERT(y1 >= 0 && y1 < image_height);
            Q_ASSERT(y2 >= 0 && y2 < image_height);

            const uchar *s1 = data->texture.scanLine(y1);
            const uchar *s2 = data->texture.scanLine(y2);

            uint tl = fetch(s1, x1, data->texture.colorTable);
            uint tr = fetch(s1, x2, data->texture.colorTable);
            uint bl = fetch(s2, x1, data->texture.colorTable);
            uint br = fetch(s2, x2, data->texture.colorTable);

            uint xtop = INTERPOLATE_PIXEL_256(tl, idistx, tr, distx);
            uint xbot = INTERPOLATE_PIXEL_256(bl, idistx, br, distx);
            *b = INTERPOLATE_PIXEL_256(xtop, idisty, xbot, disty);

            fx += fdx;
            fy += fdy;
            ++b;
        }
    } else {
        int fdw = (int)(data->m13 * fixed_scale);
        int fw = int((data->m13 * (x + 0.5)
                      + data->m23 * (y + 0.5) + 1.) * fixed_scale);
        if (!fw)
            fw = 1;
        while (b < end) {
            int x1 = fx/fw;
            int x2 = x1 + 1;
            int y1 = fy/fw;
            int y2 = y1 + 1;

            int distx = ((fx -(x1*fw)) >> 8) & 0xff;
            int disty = ((fy -(y1*fw)) >> 8) & 0xff;
            int idistx = 256 - distx;
            int idisty = 256 - disty;

            x1 %= image_width;
            x2 %= image_width;
            y1 %= image_height;
            y2 %= image_height;

            if (x1 < 0) x1 += image_width;
            if (x2 < 0) x2 += image_width;
            if (y1 < 0) y1 += image_height;
            if (y2 < 0) y2 += image_height;

            Q_ASSERT(x1 >= 0 && x1 < image_width);
            Q_ASSERT(x2 >= 0 && x2 < image_width);
            Q_ASSERT(y1 >= 0 && y1 < image_height);
            Q_ASSERT(y2 >= 0 && y2 < image_height);

            const uchar *s1 = data->texture.scanLine(y1);
            const uchar *s2 = data->texture.scanLine(y2);

            uint tl = fetch(s1, x1, data->texture.colorTable);
            uint tr = fetch(s1, x2, data->texture.colorTable);
            uint bl = fetch(s2, x1, data->texture.colorTable);
            uint br = fetch(s2, x2, data->texture.colorTable);

            uint xtop = INTERPOLATE_PIXEL_256(tl, idistx, tr, distx);
            uint xbot = INTERPOLATE_PIXEL_256(bl, idistx, br, distx);
            *b = INTERPOLATE_PIXEL_256(xtop, idisty, xbot, disty);

            fx += fdx;
            fy += fdy;
            fw += fdw;
            //force increment to avoid /0
            if (!fw) {
                fw += fdw;
            }
            ++b;
        }
    }

    return buffer;
}


static const SourceFetchProc sourceFetch[NBlendTypes][QImage::NImageFormats] = {
    // Untransformed
    {
        0, // Invalid
        fetch_generic,   // Mono
        fetch_generic,   // MonoLsb
        fetch_generic,   // Indexed8
        fetch_generic,   // RGB32
        fetch_generic,   // ARGB32
        fetch_generic,   // ARGB32_Premultiplied
        fetch_generic    // RGB16
    },
    // Tiled
    {
        0, // Invalid
        fetch_generic,   // Mono
        fetch_generic,   // MonoLsb
        fetch_generic,   // Indexed8
        fetch_generic,   // RGB32
        fetch_generic,   // ARGB32
        fetch_generic,   // ARGB32_Premultiplied
        fetch_generic    // RGB16
    },
    // Transformed
    {
        0, // Invalid
        fetchTransformed_generic,   // Mono
        fetchTransformed_generic,   // MonoLsb
        fetchTransformed_generic,   // Indexed8
        fetchTransformed_generic,   // RGB32
        fetchTransformed_generic,   // ARGB32
        fetchTransformed_generic,   // ARGB32_Premultiplied
        fetchTransformed_generic    // RGB16
    },
    {
        0, // TransformedTiled
        fetchTransformedTiled_generic,   // Mono
        fetchTransformedTiled_generic,   // MonoLsb
        fetchTransformedTiled_generic,   // Indexed8
        fetchTransformedTiled_generic,   // RGB32
        fetchTransformedTiled_generic,   // ARGB32
        fetchTransformedTiled_generic,   // ARGB32_Premultiplied
        fetchTransformedTiled_generic    // RGB16
    },
    {
        0, // Bilinear
        fetchTransformedBilinear_generic,   // Mono
        fetchTransformedBilinear_generic,   // MonoLsb
        fetchTransformedBilinear_generic,   // Indexed8
        fetchTransformedBilinear_generic,   // RGB32
        fetchTransformedBilinear_generic,   // ARGB32
        fetchTransformedBilinear_generic,   // ARGB32_Premultiplied
        fetchTransformedBilinear_generic    // RGB16
    },
    {
        0, // BilinearTiled
        fetchTransformedBilinearTiled_generic,   // Mono
        fetchTransformedBilinearTiled_generic,   // MonoLsb
        fetchTransformedBilinearTiled_generic,   // Indexed8
        fetchTransformedBilinearTiled_generic,   // RGB32
        fetchTransformedBilinearTiled_generic,   // ARGB32
        fetchTransformedBilinearTiled_generic,   // ARGB32_Premultiplied
        fetchTransformedBilinearTiled_generic    // RGB16
    },
};


static uint qt_gradient_pixel(const GradientData *data, qreal pos)
{
    int ipos = qRound(pos * GRADIENT_STOPTABLE_SIZE - 1);

  // calculate the actual offset.
    if (ipos < 0 || ipos >= GRADIENT_STOPTABLE_SIZE) {
        if (data->spread == QGradient::RepeatSpread) {
            ipos = ipos % GRADIENT_STOPTABLE_SIZE;
            ipos = ipos < 0 ? GRADIENT_STOPTABLE_SIZE + ipos : ipos;

        } else if (data->spread == QGradient::ReflectSpread) {
            const int limit = GRADIENT_STOPTABLE_SIZE * 2 - 1;
            ipos = ipos % limit;
            ipos = ipos < 0 ? limit + ipos : ipos;
            ipos = ipos >= GRADIENT_STOPTABLE_SIZE ? limit - ipos : ipos;

        } else {
            if (ipos < 0) ipos = 0;
            else if (ipos >= GRADIENT_STOPTABLE_SIZE) ipos = GRADIENT_STOPTABLE_SIZE-1;
        }
    }

    Q_ASSERT(ipos >= 0);
    Q_ASSERT(ipos < GRADIENT_STOPTABLE_SIZE);

    return data->colorTable[ipos];
}

#ifdef Q_WS_QWS

#define FIXPT_BITS 8
#define FIXPT_SIZE (1<<FIXPT_BITS)

static uint qt_gradient_pixel_fixed(const GradientData *data, int fixed_pos)
{
    int ipos = ((fixed_pos + FIXPT_SIZE / 2) >> FIXPT_BITS) - 1;

    // calculate the actual offset.
    if (ipos < 0 || ipos >= GRADIENT_STOPTABLE_SIZE) {
        if (data->spread == QGradient::RepeatSpread) {
            ipos = ipos % GRADIENT_STOPTABLE_SIZE;
            ipos = ipos < 0 ? GRADIENT_STOPTABLE_SIZE + ipos : ipos;

        } else if (data->spread == QGradient::ReflectSpread) {
            const int limit = GRADIENT_STOPTABLE_SIZE * 2 - 1;
            ipos = ipos % limit;
            ipos = ipos < 0 ? limit + ipos : ipos;
            ipos = ipos >= GRADIENT_STOPTABLE_SIZE ? limit - ipos : ipos;

        } else {