qpixmap_x11.cpp

奇趣公司比较新的qt/emd版本

    if (d == 1 || d == 16) {
        QImage im = image.convertToFormat(QImage::Format_RGB32, flags);
        return fromImage(im);
    }

    Display *dpy   = X11->display;
    Visual *visual = (Visual *) pixmap.data->xinfo.visual();
    XImage *xi           = 0;
    bool    trucol = (visual->c_class >= TrueColor);
    int     nbytes = image.numBytes();
    uchar  *newbits= 0;

#ifndef QT_NO_XRENDER
    if (X11->use_xrender && image.hasAlphaChannel()) {
        const QImage &cimage = image;

        pixmap.data->w = w;
        pixmap.data->h = h;
        pixmap.data->d = 32;

        pixmap.data->hd =
            (Qt::HANDLE)XCreatePixmap(dpy, RootWindow(dpy, pixmap.data->xinfo.screen()),
                                      w, h, pixmap.data->d);

        pixmap.data->picture = XRenderCreatePicture(X11->display, pixmap.data->hd,
                                                    XRenderFindStandardFormat(X11->display, PictStandardARGB32), 0, 0);

        xi = XCreateImage(dpy, visual, pixmap.data->d, ZPixmap, 0, 0, w, h, 32, 0);
        Q_CHECK_PTR(xi);
        newbits = (uchar *)malloc(xi->bytes_per_line*h);
        Q_CHECK_PTR(newbits);
        xi->data = (char *)newbits;

        switch(cimage.format()) {
        case QImage::Format_Indexed8: {
            QVector<QRgb> colorTable = cimage.colorTable();
            uint *xidata = (uint *)xi->data;
            for (int y = 0; y < h; ++y) {
                const uchar *p = cimage.scanLine(y);
                for (int x = 0; x < w; ++x) {
                    const QRgb rgb = colorTable[p[x]];
                    const int a = qAlpha(rgb);
                    if (a == 0xff)
                        *xidata = rgb;
                    else
                        // RENDER expects premultiplied alpha
                        *xidata = qRgba(qt_div_255(qRed(rgb) * a),
                                        qt_div_255(qGreen(rgb) * a),
                                        qt_div_255(qBlue(rgb) * a),
                                        a);
                    ++xidata;
                }
            }
        }
            break;
        case QImage::Format_RGB32: {
            uint *xidata = (uint *)xi->data;
            for (int y = 0; y < h; ++y) {
                const QRgb *p = (const QRgb *) cimage.scanLine(y);
                for (int x = 0; x < w; ++x)
                    *xidata++ = p[x] | 0xff000000;
            }
        }
            break;
        case QImage::Format_ARGB32: {
            uint *xidata = (uint *)xi->data;
            for (int y = 0; y < h; ++y) {
                const QRgb *p = (const QRgb *) cimage.scanLine(y);
                for (int x = 0; x < w; ++x) {
                    const QRgb rgb = p[x];
                    const int a = qAlpha(rgb);
                    if (a == 0xff)
                        *xidata = rgb;
                    else
                        // RENDER expects premultiplied alpha
                        *xidata = qRgba(qt_div_255(qRed(rgb) * a),
                                        qt_div_255(qGreen(rgb) * a),
                                        qt_div_255(qBlue(rgb) * a),
                                        a);
                    ++xidata;
                }
            }

        }
            break;
        case QImage::Format_ARGB32_Premultiplied: {
            uint *xidata = (uint *)xi->data;
            for (int y = 0; y < h; ++y) {
                const QRgb *p = (const QRgb *) cimage.scanLine(y);
                memcpy(xidata, p, w*sizeof(QRgb));
                xidata += w;
            }
        }
            break;
        default:
            Q_ASSERT(false);
        }

        if ((xi->byte_order == MSBFirst) != (QSysInfo::ByteOrder == QSysInfo::BigEndian)) {
            uint *xidata = (uint *)xi->data;
            uint *xiend = xidata + w*h;
            while (xidata < xiend) {
                *xidata = (*xidata >> 24)
                          | ((*xidata >> 8) & 0xff00)
                          | ((*xidata << 8) & 0xff0000)
                          | (*xidata << 24);
                ++xidata;
            }
        }

        GC gc = XCreateGC(dpy, pixmap.data->hd, 0, 0);
        XPutImage(dpy, pixmap.data->hd, gc, xi, 0, 0, 0, 0, w, h);
        XFreeGC(dpy, gc);

        qSafeXDestroyImage(xi);

        return pixmap;
    }
#endif // QT_NO_XRENDER

    if (trucol) {                                // truecolor display
        if (image.format() == QImage::Format_ARGB32_Premultiplied)
            image = image.convertToFormat(QImage::Format_ARGB32);

        const QImage &cimage = image;
        QRgb  pix[256];                                // pixel translation table
        const bool  d8 = (d == 8);
        const uint  red_mask          = (uint)visual->red_mask;
        const uint  green_mask  = (uint)visual->green_mask;
        const uint  blue_mask          = (uint)visual->blue_mask;
        const int   red_shift          = highest_bit(red_mask)   - 7;
        const int   green_shift = highest_bit(green_mask) - 7;
        const int   blue_shift  = highest_bit(blue_mask)  - 7;
        const uint  rbits = highest_bit(red_mask) - lowest_bit(red_mask) + 1;
        const uint  gbits = highest_bit(green_mask) - lowest_bit(green_mask) + 1;
        const uint  bbits = highest_bit(blue_mask) - lowest_bit(blue_mask) + 1;

        if (d8) {                                // setup pixel translation
            QVector<QRgb> ctable = cimage.colorTable();
            for (int i=0; i < cimage.numColors(); i++) {
                int r = qRed  (ctable[i]);
                int g = qGreen(ctable[i]);
                int b = qBlue (ctable[i]);
                r = red_shift        > 0 ? r << red_shift   : r >> -red_shift;
                g = green_shift > 0 ? g << green_shift : g >> -green_shift;
                b = blue_shift        > 0 ? b << blue_shift  : b >> -blue_shift;
                pix[i] = (b & blue_mask) | (g & green_mask) | (r & red_mask)
                         | ~(blue_mask | green_mask | red_mask);
            }
        }

        xi = XCreateImage(dpy, visual, dd, ZPixmap, 0, 0, w, h, 32, 0);
        Q_CHECK_PTR(xi);
        newbits = (uchar *)malloc(xi->bytes_per_line*h);
        Q_CHECK_PTR(newbits);
        if (!newbits)                                // no memory
            return QPixmap();
        int    bppc = xi->bits_per_pixel;

        bool contig_bits = n_bits(red_mask) == rbits &&
                           n_bits(green_mask) == gbits &&
                           n_bits(blue_mask) == bbits;
        bool dither_tc =
            // Want it?
            (flags & Qt::Dither_Mask) != Qt::ThresholdDither &&
            (flags & Qt::DitherMode_Mask) != Qt::AvoidDither &&
            // Need it?
            bppc < 24 && !d8 &&
            // Can do it? (Contiguous bits?)
            contig_bits;

        static bool init=false;
        static int D[16][16];
        if (dither_tc && !init) {
            // I also contributed this code to XV - WWA.
            /*
              The dither matrix, D, is obtained with this formula:

              D2 = [0 2]
              [3 1]


              D2*n = [4*Dn       4*Dn+2*Un]
              [4*Dn+3*Un  4*Dn+1*Un]
            */
            int n,i,j;
            init=1;

            /* Set D2 */
            D[0][0]=0;
            D[1][0]=2;
            D[0][1]=3;
            D[1][1]=1;

            /* Expand using recursive definition given above */
            for (n=2; n<16; n*=2) {
                for (i=0; i<n; i++) {
                    for (j=0; j<n; j++) {
                        D[i][j]*=4;
                        D[i+n][j]=D[i][j]+2;
                        D[i][j+n]=D[i][j]+3;
                        D[i+n][j+n]=D[i][j]+1;
                    }
                }
            }
            init=true;
        }

        enum { BPP8,
               BPP16_565, BPP16_555,
               BPP16_MSB, BPP16_LSB,
               BPP24_888,
               BPP24_MSB, BPP24_LSB,
               BPP32_8888,
               BPP32_MSB, BPP32_LSB
        } mode = BPP8;

        bool same_msb_lsb = (xi->byte_order == MSBFirst) == (QSysInfo::ByteOrder == QSysInfo::BigEndian);

        if(bppc == 8) // 8 bit
            mode = BPP8;
        else if(bppc == 16) { // 16 bit MSB/LSB
            if(red_shift == 8 && green_shift == 3 && blue_shift == -3 && !d8 && same_msb_lsb)
                mode = BPP16_565;
            else if(red_shift == 7 && green_shift == 2 && blue_shift == -3 && !d8 && same_msb_lsb)
                mode = BPP16_555;
            else
                mode = (xi->byte_order == LSBFirst) ? BPP16_LSB : BPP16_MSB;
        } else if(bppc == 24) { // 24 bit MSB/LSB
            if (red_shift == 16 && green_shift == 8 && blue_shift == 0 && !d8 && same_msb_lsb)
                mode = BPP24_888;
            else
                mode = (xi->byte_order == LSBFirst) ? BPP24_LSB : BPP24_MSB;
        } else if(bppc == 32) { // 32 bit MSB/LSB
            if(red_shift == 16 && green_shift == 8 && blue_shift == 0 && !d8 && same_msb_lsb)
                mode = BPP32_8888;
            else
                mode = (xi->byte_order == LSBFirst) ? BPP32_LSB : BPP32_MSB;
        } else
            qFatal("Logic error 3");

#define GET_PIXEL                                                       \
        uint pixel;                                                     \
        if (d8) pixel = pix[*src++];                                    \
        else {                                                          \
            int r = qRed  (*p);                                         \
            int g = qGreen(*p);                                         \
            int b = qBlue (*p++);                                       \
            r = red_shift   > 0                                         \
                ? r << red_shift   : r >> -red_shift;                   \
            g = green_shift > 0                                         \
                ? g << green_shift : g >> -green_shift;                 \
            b = blue_shift  > 0                                         \
                ? b << blue_shift  : b >> -blue_shift;                  \
            pixel = (r & red_mask)|(g & green_mask) | (b & blue_mask)   \
                    | ~(blue_mask | green_mask | red_mask);             \
        }

#define GET_PIXEL_DITHER_TC                                             \
        int r = qRed  (*p);                                             \
        int g = qGreen(*p);                                             \
        int b = qBlue (*p++);                                           \
        const int thres = D[x%16][y%16];                                \
        if (r <= (255-(1<<(8-rbits))) && ((r<<rbits) & 255)             \
            > thres)                                                    \
            r += (1<<(8-rbits));                                        \
        if (g <= (255-(1<<(8-gbits))) && ((g<<gbits) & 255)             \
            > thres)                                                    \
            g += (1<<(8-gbits));                                        \
        if (b <= (255-(1<<(8-bbits))) && ((b<<bbits) & 255)             \
            > thres)                                                    \
            b += (1<<(8-bbits));                                        \
        r = red_shift   > 0                                             \
            ? r << red_shift   : r >> -red_shift;                       \
        g = green_shift > 0                                             \
            ? g << green_shift : g >> -green_shift;                     \
        b = blue_shift  > 0                                             \
            ? b << blue_shift  : b >> -blue_shift;                      \
        uint pixel = (r & red_mask)|(g & green_mask) | (b & blue_mask);

// again, optimized case
// can't be optimized that much :(
#define GET_PIXEL_DITHER_TC_OPT(red_shift,green_shift,blue_shift,red_mask,green_mask,blue_mask, \
                                rbits,gbits,bbits)                      \
        const int thres = D[x%16][y%16];                                \
        int r = qRed  (*p);                                             \
        if (r <= (255-(1<<(8-rbits))) && ((r<<rbits) & 255)             \
            > thres)                                                    \
            r += (1<<(8-rbits));                                        \
        int g = qGreen(*p);                                             \
        if (g <= (255-(1<<(8-gbits))) && ((g<<gbits) & 255)             \
            > thres)                                                    \
            g += (1<<(8-gbits));                                        \
        int b = qBlue (*p++);                                           \
        if (b <= (255-(1<<(8-bbits))) && ((b<<bbits) & 255)             \
            > thres)                                                    \
            b += (1<<(8-bbits));                                        \
        uint pixel = ((r red_shift) & red_mask)                         \
                     | ((g green_shift) & green_mask)                   \
                     | ((b blue_shift) & blue_mask);

#define CYCLE(body)                                             \
        for (int y=0; y<h; y++) {                               \
            const uchar* src = cimage.scanLine(y);              \
            uchar* dst = newbits + xi->bytes_per_line*y;        \
            const QRgb* p = (const QRgb *)src;                  \
            body                                                \
                }

        if (dither_tc) {
            switch (mode) {
            case BPP16_565:
                CYCLE(
                    quint16* dst16 = (quint16*)dst;
                    for (int x=0; x<w; x++) {
                        GET_PIXEL_DITHER_TC_OPT(<<8,<<3,>>3,0xf800,0x7e0,0x1f,5,6,5)
                            *dst16++ = pixel;
                    }
                    )
                    break;
            case BPP16_555:
                CYCLE(
                    quint16* dst16 = (quint16*)dst;
                    for (int x=0; x<w; x++) {
                        GET_PIXEL_DITHER_TC_OPT(<<7,<<2,>>3,0x7c00,0x3e0,0x1f,5,5,5)
                            *dst16++ = pixel;
                    }
                    )
                    break;
            case BPP16_MSB:                        // 16 bit MSB
                CYCLE(
                    for (int x=0; x<w; x++) {
                        GET_PIXEL_DITHER_TC
                            *dst++ = (pixel >> 8);
                        *dst++ = pixel;
                    }
                    )
                    break;
            case BPP16_LSB:                        // 16 bit LSB
                CYCLE(
                    for (int x=0; x<w; x++) {
                        GET_PIXEL_DITHER_TC
                            *dst++ = pixel;
                        *dst++ = pixel >> 8;
                    }
                    )
                    break;
            default:
                qFatal("Logic error");
            }
        } else {
            switch (mode) {
            case BPP8:                        // 8 bit
                CYCLE(
                    Q_UNUSED(p);
                    for (int x=0; x<w; x++)
                        *dst++ = pix[*src++];
                    )
                    break;
            case BPP16_565:
                CYCLE(
                    quint16* dst16 = (quint16*)dst;
                    for (int x = 0; x < w; x++) {
                        *dst16++ = ((*p >> 8) & 0xf800)
                                   | ((*p >> 5) & 0x7e0)
                                   | ((*p >> 3) & 0x1f);