/*
* Copyright (C) 2010 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.
*/
#pragma once
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <utils/LinearAllocator.h>
#include <utils/RefBase.h>
#include <ui/Region.h>
#include <SkClipOp.h>
#include <SkRegion.h>
#include "ClipArea.h"
#include "Layer.h"
#include "Matrix.h"
#include "Outline.h"
#include "Rect.h"
#include "utils/Macros.h"
namespace android {
namespace uirenderer {
/**
* Temporary structure holding information for a single outline clip.
*
* These structures are treated as immutable once created, and only exist for a single frame, which
* is why they may only be allocated with a LinearAllocator.
*/
class RoundRectClipState {
public:
static void* operator new(size_t size) = delete;
static void* operator new(size_t size, LinearAllocator& allocator) {
return allocator.alloc<RoundRectClipState>(size);
}
bool areaRequiresRoundRectClip(const Rect& rect) const {
return rect.intersects(dangerRects[0])
|| rect.intersects(dangerRects[1])
|| rect.intersects(dangerRects[2])
|| rect.intersects(dangerRects[3]);
}
bool highPriority;
Matrix4 matrix;
Rect dangerRects[4];
Rect innerRect;
float radius;
};
/**
* A snapshot holds information about the current state of the rendering
* surface. A snapshot is usually created whenever the user calls save()
* and discarded when the user calls restore(). Once a snapshot is created,
* it can hold information for deferred rendering.
*
* Each snapshot has a link to a previous snapshot, indicating the previous
* state of the renderer.
*/
class Snapshot {
public:
Snapshot();
Snapshot(Snapshot* s, int saveFlags);
/**
* Various flags set on ::flags.
*/
enum Flags {
/**
* Indicates that the clip region was modified. When this
* snapshot is restored so must the clip.
*/
kFlagClipSet = 0x1,
/**
* Indicates that this snapshot was created when saving
* a new layer.
*/
kFlagIsLayer = 0x2,
/**
* Indicates that this snapshot is a special type of layer
* backed by an FBO. This flag only makes sense when the
* flag kFlagIsLayer is also set.
*
* Viewport has been modified to fit the new Fbo, and must be
* restored when this snapshot is restored.
*/
kFlagIsFboLayer = 0x4,
};
/**
* Modifies the current clip with the new clip rectangle and
* the specified operation. The specified rectangle is transformed
* by this snapshot's trasnformation.
*/
void clip(const Rect& localClip, SkClipOp op);
/**
* Modifies the current clip with the new clip rectangle and
* the specified operation. The specified rectangle is considered
* already transformed.
*/
void clipTransformed(const Rect& r, SkClipOp op = SkClipOp::kIntersect);
/**
* Modifies the current clip with the specified path and operation.
*/
void clipPath(const SkPath& path, SkClipOp op);
/**
* Sets the current clip.
*/
void setClip(float left, float top, float right, float bottom);
/**
* Returns the current clip in local coordinates. The clip rect is
* transformed by the inverse transform matrix.
*/
ANDROID_API const Rect& getLocalClip();
/**
* Returns the current clip in render target coordinates.
*/
const Rect& getRenderTargetClip() const { return mClipArea->getClipRect(); }
/*
* Accessor functions so that the clip area can stay private
*/
bool clipIsEmpty() const { return mClipArea->isEmpty(); }
const SkRegion& getClipRegion() const { return mClipArea->getClipRegion(); }
bool clipIsSimple() const { return mClipArea->isSimple(); }
const ClipArea& getClipArea() const { return *mClipArea; }
ClipArea& mutateClipArea() { return *mClipArea; }
WARN_UNUSED_RESULT const ClipBase* serializeIntersectedClip(LinearAllocator& allocator,
const ClipBase* recordedClip, const Matrix4& recordedClipTransform);
void applyClip(const ClipBase* clip, const Matrix4& transform);
/**
* Resets the clip to the specified rect.
*/
void resetClip(float left, float top, float right, float bottom);
void initializeViewport(int width, int height) {
mViewportData.initialize(width, height);
mClipAreaRoot.setViewportDimensions(width, height);
}
int getViewportWidth() const { return mViewportData.mWidth; }
int getViewportHeight() const { return mViewportData.mHeight; }
const Matrix4& getOrthoMatrix() const { return mViewportData.mOrthoMatrix; }
const Vector3& getRelativeLightCenter() const { return mRelativeLightCenter; }
void setRelativeLightCenter(const Vector3& lightCenter) { mRelativeLightCenter = lightCenter; }
/**
* Sets (and replaces) the current clipping outline
*
* If the current round rect clip is high priority, the incoming clip is ignored.
*/
void setClippingRoundRect(LinearAllocator& allocator, const Rect& bounds,
float radius, bool highPriority);
/**
* Sets (and replaces) the current projection mask
*/
void setProjectionPathMask(const SkPath* path);
/**
* Indicates whether the current transform has perspective components.
*/
bool hasPerspectiveTransform() const;
/**
* Dirty flags.
*/
int flags;
/**
* Previous snapshot.
*/
Snapshot* previous;
/**
* A pointer to the currently active layer.
*
* This snapshot does not own the layer, this pointer must not be freed.
*/
Layer* layer;
/**
* Target FBO used for rendering. Set to 0 when rendering directly
* into the framebuffer.
*/
GLuint fbo;
/**
* Local transformation. Holds the current translation, scale and
* rotation values.
*
* This is a reference to a matrix owned by this snapshot or another
* snapshot. This pointer must not be freed. See ::mTransformRoot.
*/
mat4* transform;
/**
* Current alpha value. This value is 1 by default, but may be set by a DisplayList which
* has translucent rendering in a non-overlapping View. This value will be used by
* the renderer to set the alpha in the current color being used for ensuing drawing
* operations. The value is inherited by child snapshots because the same value should
* be applied to descendants of the current DisplayList (for example, a TextView contains
* the base alpha value which should be applied to the child DisplayLists used for drawing
* the actual text).
*/
float alpha;
/**
* Current clipping round rect.
*
* Points to data not owned by the snapshot, and may only be replaced by subsequent RR clips,
* never modified.
*/
const RoundRectClipState* roundRectClipState;
/**
* Current projection masking path - used exclusively to mask projected, tessellated circles.
*/
const SkPath* projectionPathMask;
void dump() const;
private:
struct ViewportData {
ViewportData() : mWidth(0), mHeight(0) {}
void initialize(int width, int height) {
mWidth = width;
mHeight = height;
mOrthoMatrix.loadOrtho(0, width, height, 0, -1, 1);
}
/*
* Width and height of current viewport.
*
* The viewport is always defined to be (0, 0, width, height).
*/
int mWidth;
int mHeight;
/**
* Contains the current orthographic, projection matrix.
*/
mat4 mOrthoMatrix;
};
mat4 mTransformRoot;
ClipArea mClipAreaRoot;
ClipArea* mClipArea;
Rect mLocalClip;
ViewportData mViewportData;
Vector3 mRelativeLightCenter;
}; // class Snapshot
}; // namespace uirenderer
}; // namespace android