libs/hwui/DisplayListCanvas.h

/*
 * 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.
 */

#ifndef ANDROID_HWUI_DISPLAY_LIST_RENDERER_H
#define ANDROID_HWUI_DISPLAY_LIST_RENDERER_H

#include <SkChunkAlloc.h>
#include <SkFlattenable.h>
#include <SkMatrix.h>
#include <SkCamera.h>
#include <SkPaint.h>
#include <SkPath.h>
#include <SkRefCnt.h>
#include <SkTDArray.h>
#include <SkTSearch.h>

#include <cutils/compiler.h>

#include "DisplayListLogBuffer.h"
#include "OpenGLRenderer.h"
#include "utils/LinearAllocator.h"

namespace android {
namespace uirenderer {

///////////////////////////////////////////////////////////////////////////////
// Defines
///////////////////////////////////////////////////////////////////////////////

#define MIN_WRITER_SIZE 4096
#define OP_MAY_BE_SKIPPED_MASK 0xff000000

// Debug
#if DEBUG_DISPLAY_LIST
    #define DISPLAY_LIST_LOGD(...) ALOGD(__VA_ARGS__)
#else
    #define DISPLAY_LIST_LOGD(...)
#endif

#define TRANSLATION 0x0001
#define ROTATION    0x0002
#define ROTATION_3D 0x0004
#define SCALE       0x0008
#define PIVOT       0x0010

///////////////////////////////////////////////////////////////////////////////
// Display list
///////////////////////////////////////////////////////////////////////////////

class DisplayListRenderer;
class DisplayListOp;
class DrawOp;
class StateOp;

/**
 * Refcounted structure that holds data used in display list stream
 */
class DisplayListData: public LightRefBase<DisplayListData> {
public:
    LinearAllocator allocator;
    Vector<DisplayListOp*> displayListOps;
};

/**
 * Replays recorded drawing commands.
 */
class DisplayList {
public:
    DisplayList(const DisplayListRenderer& recorder);
    ANDROID_API ~DisplayList();

    // See flags defined in DisplayList.java
    enum ReplayFlag {
        kReplayFlag_ClipChildren = 0x1
    };

    void setViewProperties(OpenGLRenderer& renderer, uint32_t level);
    void outputViewProperties(uint32_t level);

    ANDROID_API size_t getSize();
    ANDROID_API static void destroyDisplayListDeferred(DisplayList* displayList);
    ANDROID_API static void outputLogBuffer(int fd);

    void initFromDisplayListRenderer(const DisplayListRenderer& recorder, bool reusing = false);

    status_t replay(OpenGLRenderer& renderer, Rect& dirty, int32_t flags, uint32_t level = 0);

    void output(uint32_t level = 0);

    ANDROID_API void reset();

    void setRenderable(bool renderable) {
        mIsRenderable = renderable;
    }

    bool isRenderable() const {
        return mIsRenderable;
    }

    void setName(const char* name) {
        if (name) {
            mName.setTo(name);
        }
    }

    void setClipChildren(bool clipChildren) {
        mClipChildren = clipChildren;
    }

    void setStaticMatrix(SkMatrix* matrix) {
        delete mStaticMatrix;
        mStaticMatrix = new SkMatrix(*matrix);
    }

    void setAnimationMatrix(SkMatrix* matrix) {
        delete mAnimationMatrix;
        if (matrix) {
            mAnimationMatrix = new SkMatrix(*matrix);
        } else {
            mAnimationMatrix = NULL;
        }
    }

    void setAlpha(float alpha) {
        alpha = fminf(1.0f, fmaxf(0.0f, alpha));
        if (alpha != mAlpha) {
            mAlpha = alpha;
            mMultipliedAlpha = (int) (255 * alpha);
        }
    }

    void setHasOverlappingRendering(bool hasOverlappingRendering) {
        mHasOverlappingRendering = hasOverlappingRendering;
    }

    void setTranslationX(float translationX) {
        if (translationX != mTranslationX) {
            mTranslationX = translationX;
            mMatrixDirty = true;
            if (mTranslationX == 0.0f && mTranslationY == 0.0f) {
                mMatrixFlags &= ~TRANSLATION;
            } else {
                mMatrixFlags |= TRANSLATION;
            }
        }
    }

    void setTranslationY(float translationY) {
        if (translationY != mTranslationY) {
            mTranslationY = translationY;
            mMatrixDirty = true;
            if (mTranslationX == 0.0f && mTranslationY == 0.0f) {
                mMatrixFlags &= ~TRANSLATION;
            } else {
                mMatrixFlags |= TRANSLATION;
            }
        }
    }

    void setRotation(float rotation) {
        if (rotation != mRotation) {
            mRotation = rotation;
            mMatrixDirty = true;
            if (mRotation == 0.0f) {
                mMatrixFlags &= ~ROTATION;
            } else {
                mMatrixFlags |= ROTATION;
            }
        }
    }

    void setRotationX(float rotationX) {
        if (rotationX != mRotationX) {
            mRotationX = rotationX;
            mMatrixDirty = true;
            if (mRotationX == 0.0f && mRotationY == 0.0f) {
                mMatrixFlags &= ~ROTATION_3D;
            } else {
                mMatrixFlags |= ROTATION_3D;
            }
        }
    }

    void setRotationY(float rotationY) {
        if (rotationY != mRotationY) {
            mRotationY = rotationY;
            mMatrixDirty = true;
            if (mRotationX == 0.0f && mRotationY == 0.0f) {
                mMatrixFlags &= ~ROTATION_3D;
            } else {
                mMatrixFlags |= ROTATION_3D;
            }
        }
    }

    void setScaleX(float scaleX) {
        if (scaleX != mScaleX) {
            mScaleX = scaleX;
            mMatrixDirty = true;
            if (mScaleX == 1.0f && mScaleY == 1.0f) {
                mMatrixFlags &= ~SCALE;
            } else {
                mMatrixFlags |= SCALE;
            }
        }
    }

    void setScaleY(float scaleY) {
        if (scaleY != mScaleY) {
            mScaleY = scaleY;
            mMatrixDirty = true;
            if (mScaleX == 1.0f && mScaleY == 1.0f) {
                mMatrixFlags &= ~SCALE;
            } else {
                mMatrixFlags |= SCALE;
            }
        }
    }

    void setPivotX(float pivotX) {
        mPivotX = pivotX;
        mMatrixDirty = true;
        if (mPivotX == 0.0f && mPivotY == 0.0f) {
            mMatrixFlags &= ~PIVOT;
        } else {
            mMatrixFlags |= PIVOT;
        }
        mPivotExplicitlySet = true;
    }

    void setPivotY(float pivotY) {
        mPivotY = pivotY;
        mMatrixDirty = true;
        if (mPivotX == 0.0f && mPivotY == 0.0f) {
            mMatrixFlags &= ~PIVOT;
        } else {
            mMatrixFlags |= PIVOT;
        }
        mPivotExplicitlySet = true;
    }

    void setCameraDistance(float distance) {
        if (distance != mCameraDistance) {
            mCameraDistance = distance;
            mMatrixDirty = true;
            if (!mTransformCamera) {
                mTransformCamera = new Sk3DView();
                mTransformMatrix3D = new SkMatrix();
            }
            mTransformCamera->setCameraLocation(0, 0, distance);
        }
    }

    void setLeft(int left) {
        if (left != mLeft) {
            mLeft = left;
            mWidth = mRight - mLeft;
            if (mMatrixFlags > TRANSLATION && !mPivotExplicitlySet) {
                mMatrixDirty = true;
            }
        }
    }

    void setTop(int top) {
        if (top != mTop) {
            mTop = top;
            mHeight = mBottom - mTop;
            if (mMatrixFlags > TRANSLATION && !mPivotExplicitlySet) {
                mMatrixDirty = true;
            }
        }
    }

    void setRight(int right) {
        if (right != mRight) {
            mRight = right;
            mWidth = mRight - mLeft;
            if (mMatrixFlags > TRANSLATION && !mPivotExplicitlySet) {
                mMatrixDirty = true;
            }
        }
    }

    void setBottom(int bottom) {
        if (bottom != mBottom) {
            mBottom = bottom;
            mHeight = mBottom - mTop;
            if (mMatrixFlags > TRANSLATION && !mPivotExplicitlySet) {
                mMatrixDirty = true;
            }
        }
    }

    void setLeftTop(int left, int top) {
        if (left != mLeft || top != mTop) {
            mLeft = left;
            mTop = top;
            mWidth = mRight - mLeft;
            mHeight = mBottom - mTop;
            if (mMatrixFlags > TRANSLATION && !mPivotExplicitlySet) {
                mMatrixDirty = true;
            }
        }
    }

    void setLeftTopRightBottom(int left, int top, int right, int bottom) {
        if (left != mLeft || top != mTop || right != mRight || bottom != mBottom) {
            mLeft = left;
            mTop = top;
            mRight = right;
            mBottom = bottom;
            mWidth = mRight - mLeft;
            mHeight = mBottom - mTop;
            if (mMatrixFlags > TRANSLATION && !mPivotExplicitlySet) {
                mMatrixDirty = true;
            }
        }
    }

    void offsetLeftRight(int offset) {
        if (offset != 0) {
            mLeft += offset;
            mRight += offset;
            if (mMatrixFlags > TRANSLATION && !mPivotExplicitlySet) {
                mMatrixDirty = true;
            }
        }
    }

    void offsetTopBottom(int offset) {
        if (offset != 0) {
            mTop += offset;
            mBottom += offset;
            if (mMatrixFlags > TRANSLATION && !mPivotExplicitlySet) {
                mMatrixDirty = true;
            }
        }
    }

    void setCaching(bool caching) {
        mCaching = caching;
    }

    int getWidth() {
        return mWidth;
    }

    int getHeight() {
        return mHeight;
    }

private:
    void init();

    void clearResources();

    void updateMatrix();

    class TextContainer {
    public:
        size_t length() const {
            return mByteLength;
        }

        const char* text() const {
            return (const char*) mText;
        }

        size_t mByteLength;
        const char* mText;
    };

    Vector<SkBitmap*> mBitmapResources;
    Vector<SkBitmap*> mOwnedBitmapResources;
    Vector<SkiaColorFilter*> mFilterResources;

    Vector<SkPaint*> mPaints;
    Vector<SkPath*> mPaths;
    SortedVector<SkPath*> mSourcePaths;
    Vector<SkRegion*> mRegions;
    Vector<SkMatrix*> mMatrices;
    Vector<SkiaShader*> mShaders;
    Vector<Layer*> mLayers;

    sp<DisplayListData> mDisplayListData;

    size_t mSize;

    bool mIsRenderable;
    uint32_t mFunctorCount;

    String8 mName;

    // View properties
    bool mClipChildren;
    float mAlpha;
    int mMultipliedAlpha;
    bool mHasOverlappingRendering;
    float mTranslationX, mTranslationY;
    float mRotation, mRotationX, mRotationY;
    float mScaleX, mScaleY;
    float mPivotX, mPivotY;
    float mCameraDistance;
    int mLeft, mTop, mRight, mBottom;
    int mWidth, mHeight;
    int mPrevWidth, mPrevHeight;
    bool mPivotExplicitlySet;
    bool mMatrixDirty;
    bool mMatrixIsIdentity;
    uint32_t mMatrixFlags;
    SkMatrix* mTransformMatrix;
    Sk3DView* mTransformCamera;
    SkMatrix* mTransformMatrix3D;
    SkMatrix* mStaticMatrix;
    SkMatrix* mAnimationMatrix;
    bool mCaching;
};

///////////////////////////////////////////////////////////////////////////////
// Renderer
///////////////////////////////////////////////////////////////////////////////

/**
 * Records drawing commands in a display list for latter playback.
 */
class DisplayListRenderer: public OpenGLRenderer {
public:
    ANDROID_API DisplayListRenderer();
    virtual ~DisplayListRenderer();

    ANDROID_API DisplayList* getDisplayList(DisplayList* displayList);

    virtual bool isDeferred();

    virtual void setViewport(int width, int height);
    virtual status_t prepareDirty(float left, float top, float right, float bottom, bool opaque);
    virtual void finish();

    virtual status_t callDrawGLFunction(Functor *functor, Rect& dirty);

    virtual void interrupt();
    virtual void resume();

    virtual int save(int flags);
    virtual void restore();
    virtual void restoreToCount(int saveCount);

    virtual int saveLayer(float left, float top, float right, float bottom,
            SkPaint* p, int flags);
    virtual int saveLayerAlpha(float left, float top, float right, float bottom,
                int alpha, int flags);

    virtual void translate(float dx, float dy);
    virtual void rotate(float degrees);
    virtual void scale(float sx, float sy);
    virtual void skew(float sx, float sy);

    virtual void setMatrix(SkMatrix* matrix);
    virtual void concatMatrix(SkMatrix* matrix);

    virtual bool clipRect(float left, float top, float right, float bottom, SkRegion::Op op);
    virtual bool clipPath(SkPath* path, SkRegion::Op op);
    virtual bool clipRegion(SkRegion* region, SkRegion::Op op);

    virtual status_t drawDisplayList(DisplayList* displayList, Rect& dirty, int32_t flags,
            uint32_t level = 0);
    virtual status_t drawLayer(Layer* layer, float x, float y, SkPaint* paint);
    virtual status_t drawBitmap(SkBitmap* bitmap, float left, float top, SkPaint* paint);
    virtual status_t drawBitmap(SkBitmap* bitmap, SkMatrix* matrix, SkPaint* paint);
    virtual status_t drawBitmap(SkBitmap* bitmap, float srcLeft, float srcTop,
            float srcRight, float srcBottom, float dstLeft, float dstTop,
            float dstRight, float dstBottom, SkPaint* paint);
    virtual status_t drawBitmapData(SkBitmap* bitmap, float left, float top, SkPaint* paint);
    virtual status_t drawBitmapMesh(SkBitmap* bitmap, int meshWidth, int meshHeight,
            float* vertices, int* colors, SkPaint* paint);
    virtual status_t drawPatch(SkBitmap* bitmap, const int32_t* xDivs, const int32_t* yDivs,
            const uint32_t* colors, uint32_t width, uint32_t height, int8_t numColors,
            float left, float top, float right, float bottom, SkPaint* paint);
    virtual status_t drawColor(int color, SkXfermode::Mode mode);
    virtual status_t drawRect(float left, float top, float right, float bottom, SkPaint* paint);
    virtual status_t drawRoundRect(float left, float top, float right, float bottom,
            float rx, float ry, SkPaint* paint);
    virtual status_t drawCircle(float x, float y, float radius, SkPaint* paint);
    virtual status_t drawOval(float left, float top, float right, float bottom, SkPaint* paint);
    virtual status_t drawArc(float left, float top, float right, float bottom,
            float startAngle, float sweepAngle, bool useCenter, SkPaint* paint);
    virtual status_t drawPath(SkPath* path, SkPaint* paint);
    virtual status_t drawLines(float* points, int count, SkPaint* paint);
    virtual status_t drawPoints(float* points, int count, SkPaint* paint);
    virtual status_t drawTextOnPath(const char* text, int bytesCount, int count, SkPath* path,
            float hOffset, float vOffset, SkPaint* paint);
    virtual status_t drawPosText(const char* text, int bytesCount, int count,
            const float* positions, SkPaint* paint);
    virtual status_t drawText(const char* text, int bytesCount, int count,
            float x, float y, const float* positions, SkPaint* paint, float length);
    virtual status_t drawRects(const float* rects, int count, SkPaint* paint);

    virtual void resetShader();
    virtual void setupShader(SkiaShader* shader);

    virtual void resetColorFilter();
    virtual void setupColorFilter(SkiaColorFilter* filter);

    virtual void resetShadow();
    virtual void setupShadow(float radius, float dx, float dy, int color);

    virtual void resetPaintFilter();
    virtual void setupPaintFilter(int clearBits, int setBits);

    ANDROID_API void reset();

    sp<DisplayListData> getDisplayListData() const {
        return mDisplayListData;
    }

    const Vector<SkBitmap*>& getBitmapResources() const {
        return mBitmapResources;
    }

    const Vector<SkBitmap*>& getOwnedBitmapResources() const {
        return mOwnedBitmapResources;
    }

    const Vector<SkiaColorFilter*>& getFilterResources() const {
        return mFilterResources;
    }

    const Vector<SkiaShader*>& getShaders() const {
        return mShaders;
    }

    const Vector<SkPaint*>& getPaints() const {
        return mPaints;
    }

    const Vector<SkPath*>& getPaths() const {
        return mPaths;
    }

    const SortedVector<SkPath*>& getSourcePaths() const {
        return mSourcePaths;
    }

    const Vector<SkRegion*>& getRegions() const {
        return mRegions;
    }

    const Vector<Layer*>& getLayers() const {
        return mLayers;
    }

    const Vector<SkMatrix*>& getMatrices() const {
        return mMatrices;
    }

    uint32_t getFunctorCount() const {
        return mFunctorCount;
    }

private:
    void insertRestoreToCount();
    void insertTranslate();

    LinearAllocator& alloc() { return mDisplayListData->allocator; }
    void addStateOp(StateOp* op);
    bool addDrawOp(DrawOp* op); // returns true if op not rejected
    void addOpInternal(DisplayListOp* op) {
        insertRestoreToCount();
        insertTranslate();
        mDisplayListData->displayListOps.add(op);
    }

    template<class T>
    inline T* refBuffer(const T* srcBuffer, int32_t count) {
        if (srcBuffer == NULL) return NULL;
        T* dstBuffer = (T*) mDisplayListData->allocator.alloc(count * sizeof(T));
        memcpy(dstBuffer, srcBuffer, count * sizeof(T));
        return dstBuffer;
    }

    inline char* refText(const char* text, size_t byteLength) {
        return (char*) refBuffer<uint8_t>((uint8_t*)text, byteLength);
    }

    inline SkPath* refPath(SkPath* path) {
        if (!path) return NULL;

        SkPath* pathCopy = mPathMap.valueFor(path);
        if (pathCopy == NULL || pathCopy->getGenerationID() != path->getGenerationID()) {
            pathCopy = new SkPath(*path);
            pathCopy->setSourcePath(path);
            // replaceValueFor() performs an add if the entry doesn't exist
            mPathMap.replaceValueFor(path, pathCopy);
            mPaths.add(pathCopy);
        }
        if (mSourcePaths.indexOf(path) < 0) {
            mCaches.resourceCache.incrementRefcount(path);
            mSourcePaths.add(path);
        }
        return pathCopy;
    }

    inline SkPaint* refPaint(SkPaint* paint) {
        if (!paint) {
            return paint;
        }

        SkPaint* paintCopy = mPaintMap.valueFor(paint);
        if (paintCopy == NULL || paintCopy->getGenerationID() != paint->getGenerationID()) {
            paintCopy = new SkPaint(*paint);
            // replaceValueFor() performs an add if the entry doesn't exist
            mPaintMap.replaceValueFor(paint, paintCopy);
            mPaints.add(paintCopy);
        }

        return paintCopy;
    }

    inline SkRegion* refRegion(SkRegion* region) {
        if (!region) {
            return region;
        }

        SkRegion* regionCopy = mRegionMap.valueFor(region);
        // TODO: Add generation ID to SkRegion
        if (regionCopy == NULL) {
            regionCopy = new SkRegion(*region);
            // replaceValueFor() performs an add if the entry doesn't exist
            mRegionMap.replaceValueFor(region, regionCopy);
            mRegions.add(regionCopy);
        }

        return regionCopy;
    }

    inline SkMatrix* refMatrix(SkMatrix* matrix) {
        // Copying the matrix is cheap and prevents against the user changing the original
        // matrix before the operation that uses it
        SkMatrix* copy = new SkMatrix(*matrix);
        mMatrices.add(copy);
        return copy;
    }

    inline SkBitmap* refBitmap(SkBitmap* bitmap) {
        // Note that this assumes the bitmap is immutable. There are cases this won't handle
        // correctly, such as creating the bitmap from scratch, drawing with it, changing its
        // contents, and drawing again. The only fix would be to always copy it the first time,
        // which doesn't seem worth the extra cycles for this unlikely case.
        mBitmapResources.add(bitmap);
        mCaches.resourceCache.incrementRefcount(bitmap);
        return bitmap;
    }

    inline SkBitmap* refBitmapData(SkBitmap* bitmap) {
        mOwnedBitmapResources.add(bitmap);
        mCaches.resourceCache.incrementRefcount(bitmap);
        return bitmap;
    }

    inline SkiaShader* refShader(SkiaShader* shader) {
        if (!shader) return NULL;

        SkiaShader* shaderCopy = mShaderMap.valueFor(shader);
        // TODO: We also need to handle generation ID changes in compose shaders
        if (shaderCopy == NULL || shaderCopy->getGenerationId() != shader->getGenerationId()) {
            shaderCopy = shader->copy();
            // replaceValueFor() performs an add if the entry doesn't exist
            mShaderMap.replaceValueFor(shader, shaderCopy);
            mShaders.add(shaderCopy);
            mCaches.resourceCache.incrementRefcount(shaderCopy);
        }
        return shaderCopy;
    }

    inline SkiaColorFilter* refColorFilter(SkiaColorFilter* colorFilter) {
        mFilterResources.add(colorFilter);
        mCaches.resourceCache.incrementRefcount(colorFilter);
        return colorFilter;
    }

    Vector<SkBitmap*> mBitmapResources;
    Vector<SkBitmap*> mOwnedBitmapResources;
    Vector<SkiaColorFilter*> mFilterResources;

    Vector<SkPaint*> mPaints;
    DefaultKeyedVector<SkPaint*, SkPaint*> mPaintMap;

    Vector<SkPath*> mPaths;
    DefaultKeyedVector<SkPath*, SkPath*> mPathMap;

    SortedVector<SkPath*> mSourcePaths;

    Vector<SkRegion*> mRegions;
    DefaultKeyedVector<SkRegion*, SkRegion*> mRegionMap;

    Vector<SkiaShader*> mShaders;
    DefaultKeyedVector<SkiaShader*, SkiaShader*> mShaderMap;

    Vector<SkMatrix*> mMatrices;

    Vector<Layer*> mLayers;

    int mRestoreSaveCount;

    Caches& mCaches;
    sp<DisplayListData> mDisplayListData;

    float mTranslateX;
    float mTranslateY;
    bool mHasTranslate;
    bool mHasDrawOps;

    uint32_t mFunctorCount;

    friend class DisplayList;

}; // class DisplayListRenderer

}; // namespace uirenderer
}; // namespace android

#endif // ANDROID_HWUI_DISPLAY_LIST_RENDERER_H