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100 lines
3.6 KiB
100 lines
3.6 KiB
#pragma once
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#include <ui/GraphicTypes.h>
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#include <ui/Transform.h>
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#include <functional>
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namespace android {
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class DisplayDevice;
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// RenderArea describes a rectangular area that layers can be rendered to.
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//
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// There is a logical render area and a physical render area. When a layer is
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// rendered to the render area, it is first transformed and clipped to the logical
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// render area. The transformed and clipped layer is then projected onto the
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// physical render area.
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class RenderArea {
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public:
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using RotationFlags = ui::Transform::RotationFlags;
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enum class CaptureFill {CLEAR, OPAQUE};
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static float getCaptureFillValue(CaptureFill captureFill);
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RenderArea(ui::Size reqSize, CaptureFill captureFill, ui::Dataspace reqDataSpace,
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const Rect& layerStackRect, bool allowSecureLayers = false,
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RotationFlags rotation = ui::Transform::ROT_0)
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: mAllowSecureLayers(allowSecureLayers),
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mReqSize(reqSize),
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mReqDataSpace(reqDataSpace),
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mCaptureFill(captureFill),
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mRotationFlags(rotation),
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mLayerStackSpaceRect(layerStackRect) {}
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virtual ~RenderArea() = default;
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// Invoke drawLayers to render layers into the render area.
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virtual void render(std::function<void()> drawLayers) { drawLayers(); }
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// Returns true if the render area is secure. A secure layer should be
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// blacked out / skipped when rendered to an insecure render area.
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virtual bool isSecure() const = 0;
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// Returns true if the otherwise disabled layer filtering should be
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// enabled when rendering to this render area.
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virtual bool needsFiltering() const = 0;
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// Returns the transform to be applied on layers to transform them into
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// the logical render area.
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virtual const ui::Transform& getTransform() const = 0;
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// Returns the size of the logical render area. Layers are clipped to the
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// logical render area.
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virtual int getWidth() const = 0;
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virtual int getHeight() const = 0;
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virtual Rect getBounds() const = 0;
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// Returns the source crop of the render area. The source crop defines
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// how layers are projected from the logical render area onto the physical
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// render area. It can be larger than the logical render area. It can
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// also be optionally rotated.
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//
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// The source crop is specified in layer space (when rendering a layer and
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// its children), or in layer-stack space (when rendering all layers visible
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// on the display).
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virtual Rect getSourceCrop() const = 0;
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// Returns the rotation of the source crop and the layers.
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RotationFlags getRotationFlags() const { return mRotationFlags; }
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// Returns the size of the physical render area.
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int getReqWidth() const { return mReqSize.width; }
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int getReqHeight() const { return mReqSize.height; }
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// Returns the composition data space of the render area.
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ui::Dataspace getReqDataSpace() const { return mReqDataSpace; }
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// Returns the fill color of the physical render area. Regions not
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// covered by any rendered layer should be filled with this color.
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CaptureFill getCaptureFill() const { return mCaptureFill; }
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virtual sp<const DisplayDevice> getDisplayDevice() const = 0;
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// Returns the source display viewport.
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const Rect& getLayerStackSpaceRect() const { return mLayerStackSpaceRect; }
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protected:
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const bool mAllowSecureLayers;
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private:
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const ui::Size mReqSize;
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const ui::Dataspace mReqDataSpace;
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const CaptureFill mCaptureFill;
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const RotationFlags mRotationFlags;
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const Rect mLayerStackSpaceRect;
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};
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} // namespace android
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