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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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include "CanvasState.h"
#include "DisplayList.h"
#include "ResourceCache.h"
#include "SkiaCanvasProxy.h"
#include "Snapshot.h"
#include "hwui/Canvas.h"
#include "utils/LinearAllocator.h"
#include "utils/Macros.h"
#include "utils/NinePatch.h"
#include <SkDrawFilter.h>
#include <SkPaint.h>
#include <SkTLazy.h>
#include <vector>
namespace android {
namespace uirenderer {
struct ClipBase;
class DeferredLayerUpdater;
struct RecordedOp;
class ANDROID_API RecordingCanvas: public Canvas, public CanvasStateClient {
enum class DeferredBarrierType {
RecordingCanvas(size_t width, size_t height);
virtual ~RecordingCanvas();
virtual void resetRecording(int width, int height) override;
virtual WARN_UNUSED_RESULT DisplayList* finishRecording() override;
// ----------------------------------------------------------------------------
// ----------------------------------------------------------------------------
virtual void insertReorderBarrier(bool enableReorder) override;
virtual void drawLayer(DeferredLayerUpdater* layerHandle) override;
virtual void drawRenderNode(RenderNode* renderNode) override;
virtual void callDrawGLFunction(Functor* functor,
GlFunctorLifecycleListener* listener) override;
// ----------------------------------------------------------------------------
// CanvasStateClient interface
// ----------------------------------------------------------------------------
virtual void onViewportInitialized() override;
virtual void onSnapshotRestored(const Snapshot& removed, const Snapshot& restored) override;
virtual GLuint getTargetFbo() const override { return -1; }
// ----------------------------------------------------------------------------
// HWUI Canvas draw operations
// ----------------------------------------------------------------------------
virtual void drawRoundRect(CanvasPropertyPrimitive* left, CanvasPropertyPrimitive* top,
CanvasPropertyPrimitive* right, CanvasPropertyPrimitive* bottom,
CanvasPropertyPrimitive* rx, CanvasPropertyPrimitive* ry,
CanvasPropertyPaint* paint) override;
virtual void drawCircle(CanvasPropertyPrimitive* x, CanvasPropertyPrimitive* y,
CanvasPropertyPrimitive* radius, CanvasPropertyPaint* paint) override;
// ----------------------------------------------------------------------------
// android/graphics/Canvas interface
// ----------------------------------------------------------------------------
virtual SkCanvas* asSkCanvas() override;
virtual void setBitmap(const SkBitmap& bitmap) override {
LOG_ALWAYS_FATAL("RecordingCanvas is not backed by a bitmap.");
virtual bool isOpaque() override { return false; }
virtual int width() override { return mState.getWidth(); }
virtual int height() override { return mState.getHeight(); }
virtual void setHighContrastText(bool highContrastText) override {
mHighContrastText = highContrastText;
virtual bool isHighContrastText() override { return mHighContrastText; }
// ----------------------------------------------------------------------------
// android/graphics/Canvas state operations
// ----------------------------------------------------------------------------
// Save (layer)
virtual int getSaveCount() const override { return mState.getSaveCount(); }
virtual int save(SaveFlags::Flags flags) override;
virtual void restore() override;
virtual void restoreToCount(int saveCount) override;
virtual int saveLayer(float left, float top, float right, float bottom, const SkPaint* paint,
SaveFlags::Flags flags) override;
virtual int saveLayerAlpha(float left, float top, float right, float bottom,
int alpha, SaveFlags::Flags flags) override {
SkPaint paint;
return saveLayer(left, top, right, bottom, &paint, flags);
// Matrix
virtual void getMatrix(SkMatrix* outMatrix) const override { mState.getMatrix(outMatrix); }
virtual void setMatrix(const SkMatrix& matrix) override { mState.setMatrix(matrix); }
virtual void concat(const SkMatrix& matrix) override { mState.concatMatrix(matrix); }
virtual void rotate(float degrees) override;
virtual void scale(float sx, float sy) override;
virtual void skew(float sx, float sy) override;
virtual void translate(float dx, float dy) override;
// Clip
virtual bool getClipBounds(SkRect* outRect) const override;
virtual bool quickRejectRect(float left, float top, float right, float bottom) const override;
virtual bool quickRejectPath(const SkPath& path) const override;
virtual bool clipRect(float left, float top, float right, float bottom, SkRegion::Op op) override;
virtual bool clipPath(const SkPath* path, SkRegion::Op op) override;
virtual bool clipRegion(const SkRegion* region, SkRegion::Op op) override;
// Misc
virtual SkDrawFilter* getDrawFilter() override { return mDrawFilter.get(); }
virtual void setDrawFilter(SkDrawFilter* filter) override {
// ----------------------------------------------------------------------------
// android/graphics/Canvas draw operations
// ----------------------------------------------------------------------------
virtual void drawColor(int color, SkXfermode::Mode mode) override;
virtual void drawPaint(const SkPaint& paint) override;
// Geometry
virtual void drawPoint(float x, float y, const SkPaint& paint) override {
float points[2] = { x, y };
drawPoints(points, 2, paint);
virtual void drawPoints(const float* points, int floatCount, const SkPaint& paint) override;
virtual void drawLine(float startX, float startY, float stopX, float stopY,
const SkPaint& paint) override {
float points[4] = { startX, startY, stopX, stopY };
drawLines(points, 4, paint);
virtual void drawLines(const float* points, int floatCount, const SkPaint& paint) override;
virtual void drawRect(float left, float top, float right, float bottom, const SkPaint& paint) override;
virtual void drawRegion(const SkRegion& region, const SkPaint& paint) override;
virtual void drawRoundRect(float left, float top, float right, float bottom,
float rx, float ry, const SkPaint& paint) override;
virtual void drawCircle(float x, float y, float radius, const SkPaint& paint) override;
virtual void drawOval(float left, float top, float right, float bottom, const SkPaint& paint) override;
virtual void drawArc(float left, float top, float right, float bottom,
float startAngle, float sweepAngle, bool useCenter, const SkPaint& paint) override;
virtual void drawPath(const SkPath& path, const SkPaint& paint) override;
virtual void drawVertices(SkCanvas::VertexMode vertexMode, int vertexCount,
const float* verts, const float* tex, const int* colors,
const uint16_t* indices, int indexCount, const SkPaint& paint) override
{ /* RecordingCanvas does not support drawVertices(); ignore */ }
virtual void drawVectorDrawable(VectorDrawableRoot* tree) override;
// Bitmap-based
virtual void drawBitmap(const SkBitmap& bitmap, float left, float top, const SkPaint* paint) override;
virtual void drawBitmap(const SkBitmap& bitmap, const SkMatrix& matrix,
const SkPaint* paint) override;
virtual void drawBitmap(const SkBitmap& bitmap, float srcLeft, float srcTop,
float srcRight, float srcBottom, float dstLeft, float dstTop,
float dstRight, float dstBottom, const SkPaint* paint) override;
virtual void drawBitmapMesh(const SkBitmap& bitmap, int meshWidth, int meshHeight,
const float* vertices, const int* colors, const SkPaint* paint) override;
virtual void drawNinePatch(const SkBitmap& bitmap, const android::Res_png_9patch& chunk,
float dstLeft, float dstTop, float dstRight, float dstBottom,
const SkPaint* paint) override;
// Text
virtual bool drawTextAbsolutePos() const override { return false; }
virtual void drawGlyphs(const uint16_t* text, const float* positions, int count,
const SkPaint& paint, float x, float y,
float boundsLeft, float boundsTop, float boundsRight, float boundsBottom,
float totalAdvance) override;
virtual void drawGlyphsOnPath(const uint16_t* glyphs, int count, const SkPath& path,
float hOffset, float vOffset, const SkPaint& paint) override;
const ClipBase* getRecordedClip() {
return mState.writableSnapshot()->mutateClipArea().serializeClip(alloc());
void drawBitmap(const SkBitmap* bitmap, const SkPaint* paint);
void drawSimpleRects(const float* rects, int vertexCount, const SkPaint* paint);
size_t addOp(RecordedOp* op);
// ----------------------------------------------------------------------------
// lazy object copy
// ----------------------------------------------------------------------------
LinearAllocator& alloc() { return mDisplayList->allocator; }
void refBitmapsInShader(const SkShader* shader);
template<class T>
inline const T* refBuffer(const T* srcBuffer, int32_t count) {
if (!srcBuffer) return nullptr;
T* dstBuffer = (T*) mDisplayList->allocator.alloc<T>(count * sizeof(T));
memcpy(dstBuffer, srcBuffer, count * sizeof(T));
return dstBuffer;
inline const SkPath* refPath(const SkPath* path) {
if (!path) return nullptr;
// The points/verbs within the path are refcounted so this copy operation
// is inexpensive and maintains the generationID of the original path.
const SkPath* cachedPath = new SkPath(*path);
return cachedPath;
* Returns a RenderThread-safe, const copy of the SkPaint parameter passed in
* (with deduping based on paint hash / equality check)
inline const SkPaint* refPaint(const SkPaint* paint) {
if (!paint) return nullptr;
// If there is a draw filter apply it here and store the modified paint
// so that we don't need to modify the paint every time we access it.
SkTLazy<SkPaint> filteredPaint;
if (mDrawFilter.get()) {
mDrawFilter->filter(filteredPaint.get(), SkDrawFilter::kPaint_Type);
paint = filteredPaint.get();
// compute the hash key for the paint and check the cache.
const uint32_t key = paint->getHash();
const SkPaint* cachedPaint = mPaintMap.valueFor(key);
// In the unlikely event that 2 unique paints have the same hash we do a
// object equality check to ensure we don't erroneously dedup them.
if (cachedPaint == nullptr || *cachedPaint != *paint) {
cachedPaint = new SkPaint(*paint);
// replaceValueFor() performs an add if the entry doesn't exist
mPaintMap.replaceValueFor(key, cachedPaint);
return cachedPaint;
inline const SkRegion* refRegion(const SkRegion* region) {
if (!region) {
return region;
const SkRegion* cachedRegion = mRegionMap.valueFor(region);
// TODO: Add generation ID to SkRegion
if (cachedRegion == nullptr) {
std::unique_ptr<const SkRegion> copy(new SkRegion(*region));
cachedRegion = copy.get();
// replaceValueFor() performs an add if the entry doesn't exist
mRegionMap.replaceValueFor(region, cachedRegion);
return cachedRegion;
inline const SkBitmap* refBitmap(const 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.
SkBitmap* localBitmap = alloc().create<SkBitmap>(bitmap);
return localBitmap;
inline const Res_png_9patch* refPatch(const Res_png_9patch* patch) {
return patch;
DefaultKeyedVector<uint32_t, const SkPaint*> mPaintMap;
DefaultKeyedVector<const SkPath*, const SkPath*> mPathMap;
DefaultKeyedVector<const SkRegion*, const SkRegion*> mRegionMap;
CanvasState mState;
std::unique_ptr<SkiaCanvasProxy> mSkiaCanvasProxy;
ResourceCache& mResourceCache;
DeferredBarrierType mDeferredBarrierType = DeferredBarrierType::None;
const ClipBase* mDeferredBarrierClip = nullptr;
DisplayList* mDisplayList = nullptr;
bool mHighContrastText = false;
SkAutoTUnref<SkDrawFilter> mDrawFilter;
}; // class RecordingCanvas
}; // namespace uirenderer
}; // namespace android