C++ HWCLayerInterface::setBlending方法代码示例

void LayerBase::setGeometry(
    const sp<const DisplayDevice>& hw,
        HWComposer::HWCLayerInterface& layer)
{
    layer.setDefaultState();

    // this gives us only the "orientation" component of the transform
    const State& s(drawingState());
    const uint32_t finalTransform = s.transform.getOrientation();
    // we can only handle simple transformation
    if (finalTransform & Transform::ROT_INVALID) {
        layer.setTransform(0);
    } else {
        layer.setTransform(finalTransform);
    }

    if (!isOpaque()) {
        layer.setBlending(mPremultipliedAlpha ?
                HWC_BLENDING_PREMULT :
                HWC_BLENDING_COVERAGE);
    }

    const Transform& tr = hw->getTransform();
    Rect transformedBounds(computeBounds());
    transformedBounds = tr.transform(transformedBounds);

    // scaling is already applied in transformedBounds
    layer.setFrame(transformedBounds);
    layer.setCrop(transformedBounds.getBounds());
}

void Layer::setGeometry(
    const sp<const DisplayDevice>& hw,
        HWComposer::HWCLayerInterface& layer)
{
    layer.setDefaultState();

    // enable this layer
    layer.setSkip(false);

    if (isSecure() && !hw->isSecure()) {
        layer.setSkip(true);
    }

    // this gives us only the "orientation" component of the transform
    const State& s(getDrawingState());
    if (!isOpaque() || s.alpha != 0xFF) {
        layer.setBlending(mPremultipliedAlpha ?
                HWC_BLENDING_PREMULT :
                HWC_BLENDING_COVERAGE);
    }

    // apply the layer's transform, followed by the display's global transform
    // here we're guaranteed that the layer's transform preserves rects
    Rect frame(s.transform.transform(computeBounds()));
    frame.intersect(hw->getViewport(), &frame);
    const Transform& tr(hw->getTransform());
    layer.setFrame(tr.transform(frame));
#ifdef QCOM_BSP
    // set dest_rect to display width and height, if external_only flag
    // for the layer is enabled or if its yuvLayer in extended mode.
    uint32_t x = 0, y = 0;
    uint32_t w = hw->getWidth();
    uint32_t h = hw->getHeight();
    bool extendedMode = SurfaceFlinger::isExtendedMode();
    if(isExtOnly()) {
        // Position: fullscreen for ext_only
        Rect r(0, 0, w, h);
        layer.setFrame(r);
    } else if(hw->getDisplayType() > 0 && (extendedMode && isYuvLayer())) {
        // Need to position the video full screen on external with aspect ratio
        Rect r = getAspectRatio(hw, s.active.w, s.active.h);
        layer.setFrame(r);
    }
#endif
    layer.setCrop(computeCrop(hw));
    layer.setPlaneAlpha(s.alpha);

    /*
     * Transformations are applied in this order:
     * 1) buffer orientation/flip/mirror
     * 2) state transformation (window manager)
     * 3) layer orientation (screen orientation)
     * (NOTE: the matrices are multiplied in reverse order)
     */

    const Transform bufferOrientation(mCurrentTransform);
    Transform transform(tr * s.transform * bufferOrientation);

    if (mSurfaceFlingerConsumer->getTransformToDisplayInverse()) {
        /*
         * the code below applies the display's inverse transform to the buffer
         */
        uint32_t invTransform = hw->getOrientationTransform();
        // calculate the inverse transform
        if (invTransform & NATIVE_WINDOW_TRANSFORM_ROT_90) {
            invTransform ^= NATIVE_WINDOW_TRANSFORM_FLIP_V |
                    NATIVE_WINDOW_TRANSFORM_FLIP_H;
        }
        // and apply to the current transform
        transform = transform * Transform(invTransform);
    }

    // this gives us only the "orientation" component of the transform
    const uint32_t orientation = transform.getOrientation();
    if (orientation & Transform::ROT_INVALID) {
        // we can only handle simple transformation
        layer.setSkip(true);
    } else {
        layer.setTransform(orientation);
    }
}