C++ FloatQuad::p4方法代码示例

// Computes area of quads that are possibly non-rectangular. Can be easily extended to polygons.
static inline float quadArea(const FloatQuad& quad)
{
    return fabs(0.5 * (wedgeProduct(quad.p1(), quad.p2()) +
                       wedgeProduct(quad.p2(), quad.p3()) +
                       wedgeProduct(quad.p3(), quad.p4()) +
                       wedgeProduct(quad.p4(), quad.p1())));
}

void PopupContainer::showInRect(const FloatQuad& controlPosition, const IntSize& controlSize, FrameView* v, int index)
{
    // The controlSize is the size of the select box. It's usually larger than
    // we need. Subtract border size so that usually the container will be
    // displayed exactly the same width as the select box.
    listBox()->setBaseWidth(max(controlSize.width() - borderSize * 2, 0));

    listBox()->updateFromElement();

    // We set the selected item in updateFromElement(), and disregard the
    // index passed into this function (same as Webkit's PopupMenuWin.cpp)
    // FIXME: make sure this is correct, and add an assertion.
    // ASSERT(popupWindow(popup)->listBox()->selectedIndex() == index);

    // Save and convert the controlPosition to main window coords. Each point is converted separately
    // to window coordinates because the control could be in a transformed webview and then each point
    // would be transformed by a different delta.
    m_controlPosition.setP1(v->contentsToWindow(IntPoint(controlPosition.p1().x(), controlPosition.p1().y())));
    m_controlPosition.setP2(v->contentsToWindow(IntPoint(controlPosition.p2().x(), controlPosition.p2().y())));
    m_controlPosition.setP3(v->contentsToWindow(IntPoint(controlPosition.p3().x(), controlPosition.p3().y())));
    m_controlPosition.setP4(v->contentsToWindow(IntPoint(controlPosition.p4().x(), controlPosition.p4().y())));

    m_controlSize = controlSize;

    // Position at (0, 0) since the frameRect().location() is relative to the
    // parent WebWidget.
    setFrameRect(IntRect(IntPoint(), controlSize));
    showPopup(v);
}

void PrintTo(const FloatQuad& quad, std::ostream* os)
{
    ScopedFloatFlags scope(*os);
    *os << "FloatQuad("
        << "(" << quad.p1().x() << ", " << quad.p1().y() << "), "
        << "(" << quad.p2().x() << ", " << quad.p2().y() << "), "
        << "(" << quad.p3().x() << ", " << quad.p3().y() << "), "
        << "(" << quad.p4().x() << ", " << quad.p4().y() << "))";
}

CCLayerQuad::CCLayerQuad(const FloatQuad& quad)
{
    // Create edges.
    m_left = Edge(quad.p4(), quad.p1());
    m_right = Edge(quad.p2(), quad.p3());
    m_top = Edge(quad.p1(), quad.p2());
    m_bottom = Edge(quad.p3(), quad.p4());

    float sign = quad.isCounterclockwise() ? -1 : 1;
    m_left.scale(sign);
    m_right.scale(sign);
    m_top.scale(sign);
    m_bottom.scale(sign);
}

static void convertTargetSpaceQuadToCompositedLayer(const FloatQuad& targetSpaceQuad, LayoutObject* targetRenderer, const LayoutBoxModelObject* paintInvalidationContainer, FloatQuad& compositedSpaceQuad)
{
    ASSERT(targetRenderer);
    ASSERT(paintInvalidationContainer);
    for (unsigned i = 0; i < 4; ++i) {
        IntPoint point;
        switch (i) {
        case 0: point = roundedIntPoint(targetSpaceQuad.p1()); break;
        case 1: point = roundedIntPoint(targetSpaceQuad.p2()); break;
        case 2: point = roundedIntPoint(targetSpaceQuad.p3()); break;
        case 3: point = roundedIntPoint(targetSpaceQuad.p4()); break;
        }

        // FIXME: this does not need to be absolute, just in the paint invalidation container's space.
        point = targetRenderer->frame()->view()->contentsToRootFrame(point);
        point = paintInvalidationContainer->frame()->view()->rootFrameToContents(point);
        FloatPoint floatPoint = paintInvalidationContainer->absoluteToLocal(point, UseTransforms);
        DeprecatedPaintLayer::mapPointToPaintBackingCoordinates(paintInvalidationContainer, floatPoint);

        switch (i) {
        case 0: compositedSpaceQuad.setP1(floatPoint); break;
        case 1: compositedSpaceQuad.setP2(floatPoint); break;
        case 2: compositedSpaceQuad.setP3(floatPoint); break;
        case 3: compositedSpaceQuad.setP4(floatPoint); break;
        }
    }
}

void LayerRendererChromium::drawTexturedQuad(const TransformationMatrix& drawMatrix,
        float width, float height, float opacity, const FloatQuad& quad,
        int matrixLocation, int alphaLocation, int quadLocation)
{
    static float glMatrix[16];

    TransformationMatrix renderMatrix = drawMatrix;

    // Apply a scaling factor to size the quad from 1x1 to its intended size.
    renderMatrix.scale3d(width, height, 1);

    // Apply the projection matrix before sending the transform over to the shader.
    toGLMatrix(&glMatrix[0], m_projectionMatrix * renderMatrix);

    GLC(m_context, m_context->uniformMatrix4fv(matrixLocation, false, &glMatrix[0], 1));

    if (quadLocation != -1) {
        float point[8];
        point[0] = quad.p1().x();
        point[1] = quad.p1().y();
        point[2] = quad.p2().x();
        point[3] = quad.p2().y();
        point[4] = quad.p3().x();
        point[5] = quad.p3().y();
        point[6] = quad.p4().x();
        point[7] = quad.p4().y();
        GLC(m_context, m_context->uniform2fv(quadLocation, point, 4));
    }

    if (alphaLocation != -1)
        GLC(m_context, m_context->uniform1f(alphaLocation, opacity));

    GLC(m_context, m_context->drawElements(GraphicsContext3D::TRIANGLES, 6, GraphicsContext3D::UNSIGNED_SHORT, 0));
}

static void convertTargetSpaceQuadToCompositedLayer(const FloatQuad& targetSpaceQuad, RenderObject* targetRenderer, RenderObject* compositedRenderer, FloatQuad& compositedSpaceQuad)
{
    ASSERT(targetRenderer);
    ASSERT(compositedRenderer);

    for (unsigned i = 0; i < 4; ++i) {
        IntPoint point;
        switch (i) {
        case 0: point = roundedIntPoint(targetSpaceQuad.p1()); break;
        case 1: point = roundedIntPoint(targetSpaceQuad.p2()); break;
        case 2: point = roundedIntPoint(targetSpaceQuad.p3()); break;
        case 3: point = roundedIntPoint(targetSpaceQuad.p4()); break;
        }

        point = targetRenderer->frame()->view()->contentsToWindow(point);
        point = compositedRenderer->frame()->view()->windowToContents(point);
        FloatPoint floatPoint = compositedRenderer->absoluteToLocal(point, UseTransforms);

        switch (i) {
        case 0: compositedSpaceQuad.setP1(floatPoint); break;
        case 1: compositedSpaceQuad.setP2(floatPoint); break;
        case 2: compositedSpaceQuad.setP3(floatPoint); break;
        case 3: compositedSpaceQuad.setP4(floatPoint); break;
        }
    }
}

FloatQuad TransformationMatrix::projectQuad(const FloatQuad& q) const
{
    FloatQuad projectedQuad;
    projectedQuad.setP1(projectPoint(q.p1()));
    projectedQuad.setP2(projectPoint(q.p2()));
    projectedQuad.setP3(projectPoint(q.p3()));
    projectedQuad.setP4(projectPoint(q.p4()));
    return projectedQuad;
}

static void addQuadToPath(const FloatQuad& quad, Path& path)
{
    // FIXME: Make this create rounded quad-paths, just like the axis-aligned case.
    path.moveTo(quad.p1());
    path.addLineTo(quad.p2());
    path.addLineTo(quad.p3());
    path.addLineTo(quad.p4());
    path.closeSubpath();
}

static PassRefPtr<InspectorArray> buildArrayForQuad(const FloatQuad& quad)
{
    RefPtr<InspectorArray> array = InspectorArray::create();
    array->pushObject(buildObjectForPoint(quad.p1()));
    array->pushObject(buildObjectForPoint(quad.p2()));
    array->pushObject(buildObjectForPoint(quad.p3()));
    array->pushObject(buildObjectForPoint(quad.p4()));
    return array.release();
}

void InspectorTimelineAgent::localToPageQuad(const RenderObject& renderer, const LayoutRect& rect, FloatQuad* quad)
{
    const FrameView& frameView = renderer.view().frameView();
    FloatQuad absolute = renderer.localToAbsoluteQuad(FloatQuad(rect));
    quad->setP1(frameView.contentsToRootView(roundedIntPoint(absolute.p1())));
    quad->setP2(frameView.contentsToRootView(roundedIntPoint(absolute.p2())));
    quad->setP3(frameView.contentsToRootView(roundedIntPoint(absolute.p3())));
    quad->setP4(frameView.contentsToRootView(roundedIntPoint(absolute.p4())));
}

static Path quadToPath(const FloatQuad& quad)
{
    Path quadPath;
    quadPath.moveTo(quad.p1());
    quadPath.addLineTo(quad.p2());
    quadPath.addLineTo(quad.p3());
    quadPath.addLineTo(quad.p4());
    quadPath.closeSubpath();
    return quadPath;
}

static void localToPageQuad(const RenderObject& renderer, const LayoutRect& rect, FloatQuad* quad)
{
    LocalFrame* frame = renderer.frame();
    FrameView* view = frame->view();
    FloatQuad absolute = renderer.localToAbsoluteQuad(FloatQuad(rect));
    quad->setP1(view->contentsToRootView(roundedIntPoint(absolute.p1())));
    quad->setP2(view->contentsToRootView(roundedIntPoint(absolute.p2())));
    quad->setP3(view->contentsToRootView(roundedIntPoint(absolute.p3())));
    quad->setP4(view->contentsToRootView(roundedIntPoint(absolute.p4())));
}

static void contentsQuadToCoordinateSystem(const FrameView* mainView, const FrameView* view, FloatQuad& quad, InspectorOverlay::CoordinateSystem coordinateSystem)
{
    quad.setP1(view->contentsToRootView(roundedIntPoint(quad.p1())));
    quad.setP2(view->contentsToRootView(roundedIntPoint(quad.p2())));
    quad.setP3(view->contentsToRootView(roundedIntPoint(quad.p3())));
    quad.setP4(view->contentsToRootView(roundedIntPoint(quad.p4())));

    if (coordinateSystem == InspectorOverlay::CoordinateSystem::View)
        quad += mainView->scrollOffset();
}

void LayerRendererChromium::drawLayer(CCLayerImpl* layer, RenderSurfaceChromium* targetSurface)
{
    if (layer->renderSurface() && layer->renderSurface() != targetSurface) {
        layer->renderSurface()->draw(layer->getDrawRect());
        return;
    }

    if (!layer->drawsContent())
        return;

    if (layer->bounds().isEmpty()) {
        layer->unreserveContentsTexture();
        return;
    }

    setScissorToRect(layer->scissorRect());

    IntRect targetSurfaceRect = m_currentRenderSurface ? m_currentRenderSurface->contentRect() : m_defaultRenderSurface->contentRect();
    IntRect scissorRect = layer->scissorRect();
    if (!scissorRect.isEmpty())
        targetSurfaceRect.intersect(scissorRect);

    // Check if the layer falls within the visible bounds of the page.
    IntRect layerRect = layer->getDrawRect();
    bool isLayerVisible = targetSurfaceRect.intersects(layerRect);
    if (!isLayerVisible) {
        layer->unreserveContentsTexture();
        return;
    }

    // FIXME: Need to take into account the commulative render surface transforms all the way from
    //        the default render surface in order to determine visibility.
    TransformationMatrix combinedDrawMatrix = (layer->targetRenderSurface() ? layer->targetRenderSurface()->drawTransform().multiply(layer->drawTransform()) : layer->drawTransform());
    
    if (!layer->doubleSided()) {
        FloatRect layerRect(FloatPoint(0, 0), FloatSize(layer->bounds()));
        FloatQuad mappedLayer = combinedDrawMatrix.mapQuad(FloatQuad(layerRect));
        FloatSize horizontalDir = mappedLayer.p2() - mappedLayer.p1();
        FloatSize verticalDir = mappedLayer.p4() - mappedLayer.p1();
        FloatPoint3D xAxis(horizontalDir.width(), horizontalDir.height(), 0);
        FloatPoint3D yAxis(verticalDir.width(), verticalDir.height(), 0);
        FloatPoint3D zAxis = xAxis.cross(yAxis);
        if (zAxis.z() < 0) {
            layer->unreserveContentsTexture();
            return;
        }
    }

    layer->draw(targetSurfaceRect);

    // Draw the debug border if there is one.
    layer->drawDebugBorder();
}