C++ PlatformGraphicsContext类代码示例

void WebMediaPlayerClientImpl::paintCurrentFrameInContext(GraphicsContext* context, const IntRect& rect)
{
    // Normally GraphicsContext operations do nothing when painting is disabled.
    // Since we're accessing platformContext() directly we have to manually
    // check.
    if (m_webMediaPlayer && !context->paintingDisabled()) {
        PlatformGraphicsContext* platformContext = context->platformContext();
        WebCanvas* canvas = platformContext->canvas();
        m_webMediaPlayer->paint(canvas, rect, platformContext->getNormalizedAlpha());
    }
}

void MediaPlayerPrivate::paintCurrentFrameInContext(GraphicsContext* context, const IntRect& rect)
{
    if (!hasVideo() || context->paintingDisabled() || !m_webCorePlayer->visible())
        return;

    PlatformGraphicsContext* graphics = context->platformContext();
    ASSERT(graphics);

    BlackBerry::Platform::IntRect platformRect(rect.x(), rect.y(), rect.width(), rect.height());
    IntRect clippedRect = m_webCorePlayer->mediaPlayerClient()->mediaPlayerWindowClipRect();
    BlackBerry::Platform::IntRect platformWindowClipRect(clippedRect.x(), clippedRect.y(), clippedRect.width(), clippedRect.height());
    m_platformPlayer->paint(graphics->canvas(), platformRect, platformWindowClipRect);
}

void Font::drawComplexText(GraphicsContext* graphicsContext,
                           const TextRun& run,
                           const FloatPoint& point,
                           int from,
                           int to) const
{
    PlatformGraphicsContext* context = graphicsContext->platformContext();
    UniscribeHelperTextRun state(run, *this);

    SkColor color = graphicsContext->platformContext()->effectiveFillColor();
    unsigned char alpha = SkColorGetA(color);
    // Skip 100% transparent text; no need to draw anything.
    if (!alpha && graphicsContext->platformContext()->getStrokeStyle() == NoStroke)
        return;

    TransparencyAwareUniscribePainter painter(graphicsContext, this, run, from, to, point);

    HDC hdc = painter.hdc();
    if (windowsCanHandleTextDrawing(graphicsContext) && !hdc)
        return;

    // TODO(maruel): http://b/700464 SetTextColor doesn't support transparency.
    // Enforce non-transparent color.
    color = SkColorSetRGB(SkColorGetR(color), SkColorGetG(color), SkColorGetB(color));
    if (hdc) {
        SetTextColor(hdc, skia::SkColorToCOLORREF(color));
        SetBkMode(hdc, TRANSPARENT);
    }

    // If there is a non-blur shadow and both the fill color and shadow color 
    // are opaque, handle without skia. 
    IntSize shadowSize;
    int shadowBlur;
    Color shadowColor;
    if (graphicsContext->getShadow(shadowSize, shadowBlur, shadowColor) && windowsCanHandleDrawTextShadow(graphicsContext)) {
        COLORREF textColor = skia::SkColorToCOLORREF(SkColorSetARGB(255, shadowColor.red(), shadowColor.green(), shadowColor.blue()));
        COLORREF savedTextColor = GetTextColor(hdc);
        SetTextColor(hdc, textColor);
        state.draw(graphicsContext, hdc, static_cast<int>(point.x()) + shadowSize.width(),
                   static_cast<int>(point.y() - ascent()) + shadowSize.height(), from, to);
        SetTextColor(hdc, savedTextColor); 
    }

    // Uniscribe counts the coordinates from the upper left, while WebKit uses
    // the baseline, so we have to subtract off the ascent.
    state.draw(graphicsContext, hdc, static_cast<int>(point.x()),
               static_cast<int>(point.y() - ascent()), from, to);

    context->canvas()->endPlatformPaint();
}

static void syncPlatformContext(GraphicsContext* gc)
{
    // Stroke and fill sometimes reference each other, so always
    // sync them both to make sure our state is consistent.

    PlatformGraphicsContext* pgc = gc->platformContext();
    Gradient* grad = gc->state().fillGradient.get();
    Pattern* pat = gc->state().fillPattern.get();

    if (grad)
        pgc->setFillShader(grad->platformGradient());
    else if (pat)
        pgc->setFillShader(pat->platformPattern(AffineTransform()));
    else
        pgc->setFillColor(gc->state().fillColor);

    grad = gc->state().strokeGradient.get();
    pat = gc->state().strokePattern.get();

    if (grad)
        pgc->setStrokeShader(grad->platformGradient());
    else if (pat)
        pgc->setStrokeShader(pat->platformPattern(AffineTransform()));
    else
        pgc->setStrokeColor(gc->state().strokeColor);
}

void WebMediaPlayerClientImpl::paint(GraphicsContext* context, const IntRect& rect)
{
    // Normally GraphicsContext operations do nothing when painting is disabled.
    // Since we're accessing platformContext() directly we have to manually
    // check.
    if (m_webMediaPlayer.get() && !context->paintingDisabled()) {
#if WEBKIT_USING_SKIA
        PlatformGraphicsContext* platformContext = context->platformContext();
        WebCanvas* canvas = platformContext->canvas();

        canvas->saveLayerAlpha(0, platformContext->getNormalizedAlpha());

        m_webMediaPlayer->paint(canvas, rect);

        canvas->restore();
#elif WEBKIT_USING_CG
        m_webMediaPlayer->paint(context->platformContext(), rect);
#else
        notImplemented();
#endif
    }
}

void MediaPlayerPrivate::paint(GraphicsContext* context, const IntRect& rect)
{
#if USE(ACCELERATED_COMPOSITING)
    // Only process paint calls coming via the accelerated compositing code
    // path, where we get called with a null graphics context. See
    // LayerCompositingThread::drawTextures(). Ignore calls from the regular
    // rendering path.
    if (!context)
        m_platformPlayer->notifyOutputUpdate(BlackBerry::Platform::IntRect(rect.x(), rect.y(), rect.width(), rect.height()));
    return;
#endif

    if (!hasVideo() || context->paintingDisabled() || !m_webCorePlayer->visible())
        return;

    PlatformGraphicsContext* graphics = context->platformContext();
    ASSERT(graphics);

    BlackBerry::Platform::IntRect platformRect(rect.x(), rect.y(), rect.width(), rect.height());
    IntRect clippedRect = frameView()->windowClipRect();
    BlackBerry::Platform::IntRect platformWindowClipRect(clippedRect.x(), clippedRect.y(), clippedRect.width(), clippedRect.height());
    m_platformPlayer->paint(graphics->canvas(), platformRect, platformWindowClipRect);
}

    ~GraphicsContextPlatformPrivate() {
        if (mPgc && mPgc->deleteUs())
            delete mPgc;

        // we force restores so we don't leak any subobjects owned by our
        // stack of State records.
        while (mStateStack.count() > 0)
            this->restore();
    }