qwindowsxpstyle.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

    const int w = rect.width();
    const int h = rect.height();

    for (int y = startY; y < h; ++y) {
        register DWORD *buffer = (DWORD*)bufferPixels + (y * bufferW);
        for (int x = startX; x < w; ++x, ++buffer) {
            int alpha = (*buffer) >> 24;
            if (alpha != 0xFF) // buffer has been touched
                return true;
        }
    }
    return false;
}

/*! \internal
    Returns true if the native doublebuffer contains pixels with
    varying alpha value.
*/
bool QWindowsXPStylePrivate::hasAlphaChannel(const QRect &rect)
{
    const int startX = rect.left();
    const int startY = rect.top();
    const int w = rect.width();
    const int h = rect.height();

    int firstAlpha = -1;
    for (int y = startY; y < h/2; ++y) {
        register DWORD *buffer = (DWORD*)bufferPixels + (y * bufferW);
        for (int x = startX; x < w; ++x, ++buffer) {
            int alpha = (*buffer) >> 24;
            if (firstAlpha == -1)
                firstAlpha = alpha;
            else if (alpha != firstAlpha)
                return true;
        }
    }
    return false;
}

/*! \internal
    When the theme engine paints both a true alpha pixmap and a glyph
    into our buffer, the glyph might not contain a proper alpha value.
    The rule of thumb for premultiplied pixmaps is that the color
    values of a pixel can never be higher than the alpha values, so
    we use this to our advantage here, and fix all instances where
    this occures.
*/
bool QWindowsXPStylePrivate::fixAlphaChannel(const QRect &rect)
{
    const int startX = rect.left();
    const int startY = rect.top();
    const int w = rect.width();
    const int h = rect.height();
    bool hasFixedAlphaValue = false;

    for (int y = startY; y < h; ++y) {
        register DWORD *buffer = (DWORD*)bufferPixels + (y * bufferW);
        for (register int x = startX; x < w; ++x, ++buffer) {
            uint pixel = *buffer;
            int alpha = qAlpha(pixel);
            if (qRed(pixel) > alpha || qGreen(pixel) > alpha || qBlue(pixel) > alpha) {
                *buffer |= 0xff000000;
                hasFixedAlphaValue = true;
            }
        }
    }
    return hasFixedAlphaValue;
}

/*! \internal
    Swaps the alpha values on certain pixels:
        0xFF?????? -> 0x00??????
        0x00?????? -> 0xFF??????
    Used to determin the mask of a non-alpha transparent pixmap in
    the native doublebuffer, and swap the alphas so we may paint
    the image as a Premultiplied QImage with drawImage(), and obtain
    the mask transparency.
*/
bool QWindowsXPStylePrivate::swapAlphaChannel(const QRect &rect)
{
    const int startX = rect.left();
    const int startY = rect.top();
    const int w = rect.width();
    const int h = rect.height();
    bool valueChange = false;

    // Flip the alphas, so that 255-alpha pixels are 0, and 0-alpha are 255.
    for (int y = startY; y < h; ++y) {
        register DWORD *buffer = (DWORD*)bufferPixels + (y * bufferW);
        for (register int x = startX; x < w; ++x, ++buffer) {
            register unsigned int alphaValue = (*buffer) & 0xFF000000;
            if (alphaValue == 0xFF000000) {
                *buffer &= 0x00FFFFFF;
                valueChange = true;
            } else if (alphaValue == 0) {
                *buffer |= 0xFF000000;
                valueChange = true;
            }
        }
    }
    return valueChange;
}

/*! \internal
    Main theme drawing function.
    Determines the correct lowlevel drawing method depending on several
    factors.
        Use drawBackgroundThruNativeBuffer() if:
            - Painter does not have an HDC
            - Theme part is flipped (mirrored horizontally)
        else use drawBackgroundDirectly().
*/
void QWindowsXPStylePrivate::drawBackground(XPThemeData &themeData)
{
    if (themeData.rect.isEmpty())
        return;

    QPainter *painter = themeData.painter;
    Q_ASSERT_X(painter != 0, "QWindowsXPStylePrivate::drawBackground()", "Trying to draw a theme part without a painter");
    if (!painter)
        return;

    painter->save();

    QMatrix m = painter->matrix();
    bool complexXForm = m.m11() != 1.0 || m.m22() != 1.0 || m.m12() != 0.0 || m.m21() != 0.0;

    bool useFallback = painter->paintEngine()->getDC() == 0
                       || themeData.rotate
                       || complexXForm
	               || themeData.mirrorVertically
	               || (themeData.mirrorHorizontally && pDrawThemeBackgroundEx == 0);
    if (!useFallback)
        drawBackgroundDirectly(themeData);
    else
        drawBackgroundThruNativeBuffer(themeData);

    painter->restore();
}

/*! \internal
    This function draws the theme parts directly to the paintengines HDC.
    Do not use this if you need to perform other transformations on the
    resulting data.
*/
void QWindowsXPStylePrivate::drawBackgroundDirectly(XPThemeData &themeData)
{
    QPainter *painter = themeData.painter;
    HDC dc = painter->paintEngine()->getDC();

    QPoint redirectionDelta(int(painter->deviceMatrix().dx()),
                            int(painter->deviceMatrix().dy()));
    QRect area = themeData.rect.translated(redirectionDelta);

    QRegion sysRgn = painter->paintEngine()->systemClip();
    if (sysRgn.isEmpty())
        sysRgn = area;
    else
        sysRgn &= area;
    if (painter->hasClipping())
        sysRgn &= painter->clipRegion().translated(redirectionDelta);
    SelectClipRgn(dc, sysRgn.handle());

#ifdef DEBUG_XP_STYLE
        printf("---[ DIRECT PAINTING ]------------------> Name(%-10s) Part(%d) State(%d)\n",
               qPrintable(themeData.name), themeData.partId, themeData.stateId);
        showProperties(themeData);
#endif

    RECT drawRECT = themeData.toRECT(area);
    DTBGOPTS drawOptions;
    drawOptions.dwSize = sizeof(drawOptions);
    drawOptions.rcClip = themeData.toRECT(sysRgn.boundingRect());
    drawOptions.dwFlags = DTBG_CLIPRECT
                          | (themeData.noBorder ? DTBG_OMITBORDER : 0)
                          | (themeData.noContent ? DTBG_OMITCONTENT : 0)
                          | (themeData.mirrorHorizontally ? DTBG_MIRRORDC : 0);

    if (pDrawThemeBackgroundEx != 0) {
        pDrawThemeBackgroundEx(themeData.handle(), dc, themeData.partId, themeData.stateId, &(drawRECT), &drawOptions);
    } else {
	// We are running on a system where the uxtheme.dll does not have
	// the DrawThemeBackgroundEx function, so we need to clip away
	// borders or contents manually. All flips and mirrors uses the
	// fallback implementation

	int borderSize = 0;
	PROPERTYORIGIN origin = PO_NOTFOUND;
	pGetThemePropertyOrigin(themeData.handle(), themeData.partId, themeData.stateId, TMT_BORDERSIZE, &origin);
        pGetThemeInt(themeData.handle(), themeData.partId, themeData.stateId, TMT_BORDERSIZE, &borderSize);

	// Clip away border region
        QRegion extraClip = sysRgn;
	if ((origin == PO_CLASS || origin == PO_PART || origin == PO_STATE) && borderSize > 0) {
	    if (themeData.noBorder) {
		// extraClip &= area is already done
		drawRECT = themeData.toRECT(area.adjusted(-borderSize, -borderSize, borderSize, borderSize));
	    }

	    // Clip away content region
	    if (themeData.noContent) {
		QRegion content = area.adjusted(borderSize, borderSize, -borderSize, -borderSize);
		extraClip ^= content;
	    }

	    // Set the clip region, if used..
	    if (themeData.noBorder || themeData.noContent)
		SelectClipRgn(dc, extraClip.handle());
        }

	pDrawThemeBackground(themeData.handle(), dc, themeData.partId, themeData.stateId, &(drawRECT), &(drawOptions.rcClip));
    }
    SelectClipRgn(dc, 0);
}

/*! \internal
    This function uses a secondary Native doublebuffer for painting parts.
    It should only be used when the painteengine doesn't provide a proper
    HDC for direct painting (e.g. when doing a grabWidget(), painting to
    other pixmaps etc), or when special transformations are needed (e.g.
    flips (horizonal mirroring only, vertical are handled by the theme
    engine).
*/
void QWindowsXPStylePrivate::drawBackgroundThruNativeBuffer(XPThemeData &themeData)
{
    QPainter *painter = themeData.painter;
    QRect rect = themeData.rect;

    if ((themeData.rotate + 90) % 180 == 0) { // Catch 90,270,etc.. degree flips.
        rect = QRect(0, 0, rect.height(), rect.width());
    }
    rect.moveTo(0,0);
    int partId = themeData.partId;
    int stateId = themeData.stateId;
    int w = rect.width();
    int h = rect.height();

    // Values initialized later, either from cached values, or from function calls
    AlphaChannelType alphaType = UnknownAlpha;
    bool stateHasData = true; // We assume so;
    bool hasAlpha = false;
    bool partIsTransparent;
    bool inspectData;
    bool potentialInvalidAlpha;

    QString pixmapCacheKey = QString("$qt_xp_%1p%2s%3s%4b%5c%6w%7h").arg(themeData.name)
                             .arg(partId).arg(stateId).arg(!themeData.noBorder).arg(!themeData.noContent)
                             .arg(w).arg(h);
    QPixmap cachedPixmap;
    ThemeMapKey key(themeData);
    ThemeMapData data = alphaCache.value(key);

    bool haveCachedPixmap = false;
    bool isCached = data.dataValid;
    if (isCached) {
        if (!(stateHasData = data.hasAnyData))
            return; // Cached NOOP
        inspectData = data.wasAlphaSwapped;
        partIsTransparent = data.partIsTransparent;
        hasAlpha = data.hasAlphaChannel;
        alphaType = data.alphaType;
        potentialInvalidAlpha = data.hadInvalidAlpha;

        haveCachedPixmap = QPixmapCache::find(pixmapCacheKey, cachedPixmap);

#ifdef DEBUG_XP_STYLE
        char buf[25];
        ::sprintf(buf, "+ Pixmap(%3d, %3d) ]", w, h);
        printf("---[ CACHED %s--------> Name(%-10s) Part(%d) State(%d)\n",
               haveCachedPixmap ? buf : "]-------------------",
               qPrintable(themeData.name), themeData.partId, themeData.stateId);
#endif
    } else {
        // Not cached, so get values from Theme Engine
        BOOL tmt_borderonly = false;
        COLORREF tmt_transparentcolor = 0x0;
        PROPERTYORIGIN proporigin = PO_NOTFOUND;
        pGetThemeBool(themeData.handle(), themeData.partId, themeData.stateId, TMT_BORDERONLY, &tmt_borderonly);
        pGetThemeColor(themeData.handle(), themeData.partId, themeData.stateId, TMT_TRANSPARENTCOLOR, &tmt_transparentcolor);
        pGetThemePropertyOrigin(themeData.handle(), themeData.partId, themeData.stateId, TMT_CAPTIONMARGINS, &proporigin);
        inspectData = (tmt_transparentcolor != 0 || tmt_borderonly || proporigin == PO_PART || proporigin == PO_STATE);
        partIsTransparent = isTransparent(themeData);

        potentialInvalidAlpha = false;
        pGetThemePropertyOrigin(themeData.handle(), themeData.partId, themeData.stateId, TMT_GLYPHTYPE, &proporigin);
        if (proporigin == PO_PART || proporigin == PO_STATE) {
            int tmt_glyphtype = GT_NONE;
            pGetThemeEnumValue(themeData.handle(), themeData.partId, themeData.stateId, TMT_GLYPHTYPE, &tmt_glyphtype);
            potentialInvalidAlpha = partIsTransparent && !inspectData && tmt_glyphtype == GT_IMAGEGLYPH;
        }

#ifdef DEBUG_XP_STYLE
        printf("---[ NOT CACHED ]-----------------------> Name(%-10s) Part(%d) State(%d)\n",
               qPrintable(themeData.name), themeData.partId, themeData.stateId);
        printf("-->partIsTransparen      = %d\n", partIsTransparent);
        printf("-->inspectData           = %d\n", inspectData);
        printf("-->potentialInvalidAlpha = %d\n", potentialInvalidAlpha);
        showProperties(themeData);
#endif
    }
    bool wasAlphaSwapped = false;
    bool wasAlphaFixed = false;

    // OLD PSDK Workaround ------------------------------------------------------------------------
    // See if we need extra clipping for the older PSDK, which does
    // not have a DrawThemeBackgroundEx function for DTGB_OMITBORDER
    // and DTGB_OMITCONTENT
    bool addBorderContentClipping = false;
    QRegion extraClip;
    QRect area = rect;
    if (themeData.noBorder || themeData.noContent) {
	extraClip = area;
	// We are running on a system where the uxtheme.dll does not have
	// the DrawThemeBackgroundEx function, so we need to clip away
	// borders or contents manually.

	int borderSize = 0;
	PROPERTYORIGIN origin = PO_NOTFOUND;
	pGetThemePropertyOrigin(themeData.handle(), themeData.partId, themeData.stateId, TMT_BORDERSIZE, &origin);
	pGetThemeInt(themeData.handle(), themeData.partId, themeData.stateId, TMT_BORDERSIZE, &borderSize);

	// Clip away border region
	if ((origin == PO_CLASS || origin == PO_PART || origin == PO_STATE) && borderSize > 0) {
	    if (themeData.noBorder) {
		extraClip &= area;
		area = area.adjusted(-borderSize, -borderSize, borderSize, borderSize);
	    }

	    // Clip away content region
	    if (themeData.noContent) {
		QRegion content = area.adjusted(borderSize, borderSize, -borderSize, -borderSize);
		extraClip ^= content;
	    }
	}
	addBorderContentClipping = (themeData.noBorder | themeData.noContent);
    }

    QImage img;
    if (!haveCachedPixmap) { // If the pixmap is not cached, generate it! -------------------------
        buffer(w, h); // Ensure a buffer of at least (w, h) in size
        HDC dc = bufferHDC();

        // Clear the buffer
        if (alphaType != NoAlpha) {
            // Consider have separate "memset" function for small chunks for more speedup
            memset(bufferPixels, inspectData ? 0xFF : 0x00, bufferW * h * 4);
        }

	// Difference between area and rect
	int dx = area.x() - rect.x();
	int dy = area.y() - rect.y();
	int dr = area.right() - rect.right();
	int db = area.bottom() - rect.bottom();

	// Adjust so painting rect starts from Origo
	rect.moveTo(0,0);
        area.moveTo(dx,dy);