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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef CLIPAREA_H
#define CLIPAREA_H
#include <SkRegion.h>
#include "Matrix.h"
#include "Rect.h"
#include "utils/Pair.h"
namespace android {
namespace uirenderer {
Rect transformAndCalculateBounds(const Rect& r, const Matrix4& transform);
class TransformedRectangle {
public:
TransformedRectangle();
TransformedRectangle(const Rect& bounds, const Matrix4& transform);
bool canSimplyIntersectWith(const TransformedRectangle& other) const;
bool intersectWith(const TransformedRectangle& other);
bool isEmpty() const;
const Rect& getBounds() const {
return mBounds;
}
Rect transformedBounds() const {
Rect transformedBounds(transformAndCalculateBounds(mBounds, mTransform));
return transformedBounds;
}
const Matrix4& getTransform() const {
return mTransform;
}
private:
Rect mBounds;
Matrix4 mTransform;
};
class RectangleList {
public:
RectangleList();
bool isEmpty() const;
int getTransformedRectanglesCount() const;
const TransformedRectangle& getTransformedRectangle(int i) const;
void setEmpty();
void set(const Rect& bounds, const Matrix4& transform);
bool intersectWith(const Rect& bounds, const Matrix4& transform);
SkRegion convertToRegion(const SkRegion& clip) const;
Rect calculateBounds() const;
private:
enum {
kMaxTransformedRectangles = 5
};
int mTransformedRectanglesCount;
TransformedRectangle mTransformedRectangles[kMaxTransformedRectangles];
};
class ClipArea {
public:
ClipArea();
void setViewportDimensions(int width, int height);
bool isEmpty() const {
return mClipRect.isEmpty();
}
void setEmpty();
void setClip(float left, float top, float right, float bottom);
bool clipRectWithTransform(float left, float top, float right, float bottom,
const mat4* transform, SkRegion::Op op = SkRegion::kIntersect_Op);
bool clipRectWithTransform(const Rect& r, const mat4* transform,
SkRegion::Op op = SkRegion::kIntersect_Op);
bool clipRegion(const SkRegion& region, SkRegion::Op op = SkRegion::kIntersect_Op);
bool clipPathWithTransform(const SkPath& path, const mat4* transform,
SkRegion::Op op);
const Rect& getClipRect() const {
return mClipRect;
}
const SkRegion& getClipRegion() const {
return mClipRegion;
}
const RectangleList& getRectangleList() const {
return mRectangleList;
}
bool isRegion() const {
return kModeRegion == mMode;
}
bool isSimple() const {
return mMode == kModeRectangle;
}
bool isRectangleList() const {
return mMode == kModeRectangleList;
}
private:
void enterRectangleMode();
bool rectangleModeClipRectWithTransform(const Rect& r, const mat4* transform, SkRegion::Op op);
bool rectangleModeClipRectWithTransform(float left, float top, float right,
float bottom, const mat4* transform, SkRegion::Op op);
void enterRectangleListMode();
bool rectangleListModeClipRectWithTransform(float left, float top,
float right, float bottom, const mat4* transform, SkRegion::Op op);
bool rectangleListModeClipRectWithTransform(const Rect& r,
const mat4* transform, SkRegion::Op op);
void enterRegionModeFromRectangleMode();
void enterRegionModeFromRectangleListMode();
void enterRegionMode();
bool regionModeClipRectWithTransform(const Rect& r, const mat4* transform,
SkRegion::Op op);
bool regionModeClipRectWithTransform(float left, float top, float right,
float bottom, const mat4* transform, SkRegion::Op op);
void ensureClipRegion();
void setClipRectToRegionBounds();
bool clipRegionOp(float left, float top, float right, float bottom,
SkRegion::Op op);
SkRegion createViewportRegion() {
return SkRegion(mViewportBounds.toSkIRect());
}
void regionFromPath(const SkPath& path, SkRegion& pathAsRegion) {
pathAsRegion.setPath(path, createViewportRegion());
}
enum Mode {
kModeRectangle,
kModeRegion,
kModeRectangleList
};
Mode mMode;
Rect mViewportBounds;
Rect mClipRect;
SkRegion mClipRegion;
RectangleList mRectangleList;
};
} /* namespace uirenderer */
} /* namespace android */
#endif /* CLIPAREA_H_ */
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