qwindowsxpstyle.cpp

奇趣公司比较新的qt/emd版本

            pIsThemeActive          = (PtrIsThemeActive         )themeLib.resolve("IsThemeActive");
            pGetThemePartSize       = (PtrGetThemePartSize      )themeLib.resolve("GetThemePartSize");
            pOpenThemeData          = (PtrOpenThemeData         )themeLib.resolve("OpenThemeData");
            pCloseThemeData         = (PtrCloseThemeData        )themeLib.resolve("CloseThemeData");
            pDrawThemeBackground    = (PtrDrawThemeBackground   )themeLib.resolve("DrawThemeBackground");
            pDrawThemeBackgroundEx  = (PtrDrawThemeBackgroundEx )themeLib.resolve("DrawThemeBackgroundEx");
            pGetCurrentThemeName    = (PtrGetCurrentThemeName   )themeLib.resolve("GetCurrentThemeName");
            pGetThemeBool           = (PtrGetThemeBool          )themeLib.resolve("GetThemeBool");
            pGetThemeColor          = (PtrGetThemeColor         )themeLib.resolve("GetThemeColor");
            pGetThemeEnumValue      = (PtrGetThemeEnumValue     )themeLib.resolve("GetThemeEnumValue");
            pGetThemeFilename       = (PtrGetThemeFilename      )themeLib.resolve("GetThemeFilename");
            pGetThemeFont           = (PtrGetThemeFont          )themeLib.resolve("GetThemeFont");
            pGetThemeInt            = (PtrGetThemeInt           )themeLib.resolve("GetThemeInt");
            pGetThemeIntList        = (PtrGetThemeIntList       )themeLib.resolve("GetThemeIntList");
            pGetThemeMargins        = (PtrGetThemeMargins       )themeLib.resolve("GetThemeMargins");
            pGetThemeMetric         = (PtrGetThemeMetric        )themeLib.resolve("GetThemeMetric");
            pGetThemePartSize       = (PtrGetThemePartSize      )themeLib.resolve("GetThemePartSize");
            pGetThemePosition       = (PtrGetThemePosition      )themeLib.resolve("GetThemePosition");
            pGetThemePropertyOrigin = (PtrGetThemePropertyOrigin)themeLib.resolve("GetThemePropertyOrigin");
            pGetThemeRect           = (PtrGetThemeRect          )themeLib.resolve("GetThemeRect");
            pGetThemeString         = (PtrGetThemeString        )themeLib.resolve("GetThemeString");
            pGetThemeBackgroundRegion              = (PtrGetThemeBackgroundRegion             )themeLib.resolve("GetThemeBackgroundRegion");
            pGetThemeDocumentationProperty         = (PtrGetThemeDocumentationProperty        )themeLib.resolve("GetThemeDocumentationProperty");
            pIsThemeBackgroundPartiallyTransparent = (PtrIsThemeBackgroundPartiallyTransparent)themeLib.resolve("IsThemeBackgroundPartiallyTransparent");
        }
    }

    return pIsAppThemed != 0;
}

/*! \internal
    Returns a native buffer (DIB section) of at least the size of
    ( \a x , \a y ). The buffer has a 32 bit depth, to not lose
    the alpha values on proper alpha-pixmaps.
*/
HBITMAP QWindowsXPStylePrivate::buffer(int w, int h)
{
    // If we already have a HBITMAP which is of adequate size, just return that
    if (bufferBitmap) {
        if (bufferW >= w && bufferH >= h)
            return bufferBitmap;
        // Not big enough, discard the old one
        if (bufferDC && nullBitmap)
            SelectObject(bufferDC, nullBitmap);
        DeleteObject(bufferBitmap);
        bufferBitmap = 0;
    }

    w = qMax(bufferW, w);
    h = qMax(bufferH, h);

    if (!bufferDC)
        bufferDC = CreateCompatibleDC(qt_win_display_dc());

    // Define the header
    BITMAPINFO bmi;
    memset(&bmi, 0, sizeof(bmi));
    bmi.bmiHeader.biSize        = sizeof(BITMAPINFOHEADER);
    bmi.bmiHeader.biWidth       = w;
    bmi.bmiHeader.biHeight      = -h;
    bmi.bmiHeader.biPlanes      = 1;
    bmi.bmiHeader.biBitCount    = 32;
    bmi.bmiHeader.biCompression = BI_RGB;

    // Create the pixmap
    bufferPixels = 0;
    bufferBitmap = CreateDIBSection(bufferDC, &bmi, DIB_RGB_COLORS, (void **) &bufferPixels, 0, 0);
    GdiFlush();
    nullBitmap = (HBITMAP)SelectObject(bufferDC, bufferBitmap);

    if (!bufferBitmap) {
        qErrnoWarning("QWindowsXPStylePrivate::buffer(w,h), failed to create dibsection");
        bufferW = 0;
        bufferH = 0;
        return 0;
    }
    if (!bufferPixels) {
        qErrnoWarning("QWindowsXPStylePrivate::buffer(w,h), did not allocate pixel data");
        bufferW = 0;
        bufferH = 0;
        return 0;
    }
    bufferW = w;
    bufferH = h;
#ifdef DEBUG_XP_STYLE
    qDebug("Creating new dib section (%d, %d)", w, h);
#endif
    return bufferBitmap;
}

/*! \internal
    Returns true if the part contains any transparency at all. This does
    not indicate what kind of transparency we're dealing with. It can be
        - Alpha transparency
        - Masked transparency
*/
bool QWindowsXPStylePrivate::isTransparent(XPThemeData &themeData)
{
    return pIsThemeBackgroundPartiallyTransparent(themeData.handle(), themeData.partId,
                                                  themeData.stateId);
}

/*! \internal
    Returns a QRegion of the region of the part
*/
QRegion QWindowsXPStylePrivate::region(XPThemeData &themeData)
{
    HRGN hRgn = 0;
    RECT rect = themeData.toRECT(themeData.rect);
    if (!SUCCEEDED(pGetThemeBackgroundRegion(themeData.handle(), bufferHDC(), themeData.partId,
                                             themeData.stateId, &rect, &hRgn)))
        return QRegion();

    QRegion rgn = QRegion(0,0,1,1);
    const bool success = CombineRgn(rgn.handle(), hRgn, 0, RGN_COPY) != ERROR;
    DeleteObject(hRgn);
    if (success)
        return rgn;
    return QRegion();
}

/*! \internal
    Sets the parts region on a window.
*/
void QWindowsXPStylePrivate::setTransparency(QWidget *widget, XPThemeData &themeData)
{
    HRGN hrgn = themeData.mask();
    if (hrgn && widget)
        SetWindowRgn(winId(widget), hrgn, true);
}

/*! \internal
    Returns true if the native doublebuffer contains a pixel which
    has a non-0xFF alpha value. Should only be use when its
    guaranteed that data painted into the buffer wasn't a proper
    alpha pixmap.
*/
bool QWindowsXPStylePrivate::hasAnyData(const QRect &rect)
{
    const int startX = rect.left();
    const int startY = rect.top();
    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
                       || painter->opacity() != 1.0
                       || 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);