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#pragma once
#include <ui/GraphicTypes.h>
#include <ui/Transform.h>
#include <functional>
namespace android {
class DisplayDevice;
// RenderArea describes a rectangular area that layers can be rendered to.
//
// There is a logical render area and a physical render area. When a layer is
// rendered to the render area, it is first transformed and clipped to the logical
// render area. The transformed and clipped layer is then projected onto the
// physical render area.
class RenderArea {
public:
using RotationFlags = ui::Transform::RotationFlags;
enum class CaptureFill {CLEAR, OPAQUE};
static float getCaptureFillValue(CaptureFill captureFill);
RenderArea(uint32_t reqWidth, uint32_t reqHeight, CaptureFill captureFill,
ui::Dataspace reqDataSpace, const Rect& displayViewport,
RotationFlags rotation = ui::Transform::ROT_0)
: mReqWidth(reqWidth),
mReqHeight(reqHeight),
mReqDataSpace(reqDataSpace),
mCaptureFill(captureFill),
mRotationFlags(rotation),
mDisplayViewport(displayViewport) {}
virtual ~RenderArea() = default;
// Invoke drawLayers to render layers into the render area.
virtual void render(std::function<void()> drawLayers) { drawLayers(); }
// Returns true if the render area is secure. A secure layer should be
// blacked out / skipped when rendered to an insecure render area.
virtual bool isSecure() const = 0;
// Returns true if the otherwise disabled layer filtering should be
// enabled when rendering to this render area.
virtual bool needsFiltering() const = 0;
// Returns the transform to be applied on layers to transform them into
// the logical render area.
virtual const ui::Transform& getTransform() const = 0;
// Returns the size of the logical render area. Layers are clipped to the
// logical render area.
virtual int getWidth() const = 0;
virtual int getHeight() const = 0;
virtual Rect getBounds() const = 0;
// Returns the source crop of the render area. The source crop defines
// how layers are projected from the logical render area onto the physical
// render area. It can be larger than the logical render area. It can
// also be optionally rotated.
//
// The source crop is specified in layer space (when rendering a layer and
// its children), or in layer-stack space (when rendering all layers visible
// on the display).
virtual Rect getSourceCrop() const = 0;
// Returns the rotation of the source crop and the layers.
RotationFlags getRotationFlags() const { return mRotationFlags; }
// Returns the size of the physical render area.
int getReqWidth() const { return static_cast<int>(mReqWidth); }
int getReqHeight() const { return static_cast<int>(mReqHeight); }
// Returns the composition data space of the render area.
ui::Dataspace getReqDataSpace() const { return mReqDataSpace; }
// Returns the fill color of the physical render area. Regions not
// covered by any rendered layer should be filled with this color.
CaptureFill getCaptureFill() const { return mCaptureFill; }
virtual sp<const DisplayDevice> getDisplayDevice() const = 0;
// Returns the source display viewport.
const Rect& getDisplayViewport() const { return mDisplayViewport; }
private:
const uint32_t mReqWidth;
const uint32_t mReqHeight;
const ui::Dataspace mReqDataSpace;
const CaptureFill mCaptureFill;
const RotationFlags mRotationFlags;
const Rect mDisplayViewport;
};
} // namespace android
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