SkiaCanvas.h revision f50806afb8982acbab4510a8d04bbcf13a2bcd9e 
1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16#pragma once
17
18#include "hwui/Canvas.h"
19#include "CanvasProperty.h"
20#include "DeferredLayerUpdater.h"
21#include "RenderNode.h"
22#include "VectorDrawable.h"
23
24#include <SkCanvas.h>
25#include <SkTLazy.h>
26
27namespace android {
28
29// Holds an SkCanvas reference plus additional native data.
30class SkiaCanvas : public Canvas {
31public:
32    explicit SkiaCanvas(const SkBitmap& bitmap);
33
34    /**
35     *  Create a new SkiaCanvas.
36     *
37     *  @param canvas SkCanvas to handle calls made to this SkiaCanvas. Must
38     *      not be NULL. This constructor will ref() the SkCanvas, and unref()
39     *      it in its destructor.
40     */
41    explicit SkiaCanvas(SkCanvas* canvas);
42
43    virtual SkCanvas* asSkCanvas() override {
44        return mCanvas.get();
45    }
46
47    virtual void resetRecording(int width, int height,
48            uirenderer::RenderNode* renderNode) override {
49        LOG_ALWAYS_FATAL("SkiaCanvas cannot be reset as a recording canvas");
50    }
51
52    virtual uirenderer::DisplayList* finishRecording() override {
53        LOG_ALWAYS_FATAL("SkiaCanvas does not produce a DisplayList");
54        return nullptr;
55    }
56    virtual void insertReorderBarrier(bool enableReorder) override {
57        LOG_ALWAYS_FATAL("SkiaCanvas does not support reordering barriers");
58    }
59
60    virtual void setBitmap(const SkBitmap& bitmap) override;
61
62    virtual bool isOpaque() override;
63    virtual int width() override;
64    virtual int height() override;
65
66    virtual void setHighContrastText(bool highContrastText) override {
67        mHighContrastText = highContrastText;
68    }
69    virtual bool isHighContrastText() override { return mHighContrastText; }
70
71    virtual int getSaveCount() const override;
72    virtual int save(SaveFlags::Flags flags) override;
73    virtual void restore() override;
74    virtual void restoreToCount(int saveCount) override;
75
76    virtual int saveLayer(float left, float top, float right, float bottom,
77                const SkPaint* paint, SaveFlags::Flags flags) override;
78    virtual int saveLayerAlpha(float left, float top, float right, float bottom,
79            int alpha, SaveFlags::Flags flags) override;
80
81    virtual void getMatrix(SkMatrix* outMatrix) const override;
82    virtual void setMatrix(const SkMatrix& matrix) override;
83    virtual void concat(const SkMatrix& matrix) override;
84    virtual void rotate(float degrees) override;
85    virtual void scale(float sx, float sy) override;
86    virtual void skew(float sx, float sy) override;
87    virtual void translate(float dx, float dy) override;
88
89    virtual bool getClipBounds(SkRect* outRect) const override;
90    virtual bool quickRejectRect(float left, float top, float right, float bottom) const override;
91    virtual bool quickRejectPath(const SkPath& path) const override;
92    virtual bool clipRect(float left, float top, float right, float bottom,
93            SkRegion::Op op) override;
94    virtual bool clipPath(const SkPath* path, SkRegion::Op op) override;
95    virtual bool clipRegion(const SkRegion* region, SkRegion::Op op) override;
96
97    virtual SkDrawFilter* getDrawFilter() override;
98    virtual void setDrawFilter(SkDrawFilter* drawFilter) override;
99
100    virtual void drawColor(int color, SkBlendMode mode) override;
101    virtual void drawPaint(const SkPaint& paint) override;
102
103    virtual void drawPoint(float x, float y, const SkPaint& paint) override;
104    virtual void drawPoints(const float* points, int count, const SkPaint& paint) override;
105    virtual void drawLine(float startX, float startY, float stopX, float stopY,
106            const SkPaint& paint) override;
107    virtual void drawLines(const float* points, int count, const SkPaint& paint) override;
108    virtual void drawRect(float left, float top, float right, float bottom,
109            const SkPaint& paint) override;
110    virtual void drawRegion(const SkRegion& region, const SkPaint& paint) override;
111    virtual void drawRoundRect(float left, float top, float right, float bottom,
112            float rx, float ry, const SkPaint& paint) override;
113    virtual void drawCircle(float x, float y, float radius, const SkPaint& paint) override;
114    virtual void drawOval(float left, float top, float right, float bottom,
115            const SkPaint& paint) override;
116    virtual void drawArc(float left, float top, float right, float bottom,
117            float startAngle, float sweepAngle, bool useCenter, const SkPaint& paint) override;
118    virtual void drawPath(const SkPath& path, const SkPaint& paint) override;
119    virtual void drawVertices(SkCanvas::VertexMode vertexMode, int vertexCount,
120            const float* verts, const float* tex, const int* colors,
121            const uint16_t* indices, int indexCount, const SkPaint& paint) override;
122
123    virtual void drawBitmap(Bitmap& bitmap, float left, float top, const SkPaint* paint) override;
124    virtual void drawBitmap(Bitmap& bitmap, const SkMatrix& matrix, const SkPaint* paint) override;
125    virtual void drawBitmap(Bitmap& bitmap, float srcLeft, float srcTop,
126            float srcRight, float srcBottom, float dstLeft, float dstTop,
127            float dstRight, float dstBottom, const SkPaint* paint) override;
128    virtual void drawBitmapMesh(Bitmap& bitmap, int meshWidth, int meshHeight,
129            const float* vertices, const int* colors, const SkPaint* paint) override;
130    virtual void drawNinePatch(Bitmap& bitmap, const android::Res_png_9patch& chunk,
131            float dstLeft, float dstTop, float dstRight, float dstBottom,
132            const SkPaint* paint) override;
133
134    virtual bool drawTextAbsolutePos() const  override { return true; }
135    virtual void drawVectorDrawable(VectorDrawableRoot* vectorDrawable) override;
136
137    virtual void drawRoundRect(uirenderer::CanvasPropertyPrimitive* left,
138            uirenderer::CanvasPropertyPrimitive* top, uirenderer::CanvasPropertyPrimitive* right,
139            uirenderer::CanvasPropertyPrimitive* bottom, uirenderer::CanvasPropertyPrimitive* rx,
140            uirenderer::CanvasPropertyPrimitive* ry, uirenderer::CanvasPropertyPaint* paint) override;
141    virtual void drawCircle(uirenderer::CanvasPropertyPrimitive* x,
142            uirenderer::CanvasPropertyPrimitive* y, uirenderer::CanvasPropertyPrimitive* radius,
143            uirenderer::CanvasPropertyPaint* paint) override;
144
145    virtual void drawLayer(uirenderer::DeferredLayerUpdater* layerHandle) override;
146    virtual void drawRenderNode(uirenderer::RenderNode* renderNode) override;
147    virtual void callDrawGLFunction(Functor* functor,
148            uirenderer::GlFunctorLifecycleListener* listener) override;
149
150protected:
151    SkiaCanvas();
152    void reset(SkCanvas* skiaCanvas);
153    void drawDrawable(SkDrawable* drawable) { mCanvas->drawDrawable(drawable); }
154
155    virtual void drawGlyphs(const uint16_t* text, const float* positions, int count,
156            const SkPaint& paint, float x, float y,
157            float boundsLeft, float boundsTop, float boundsRight, float boundsBottom,
158            float totalAdvance) override;
159    virtual void drawLayoutOnPath(const minikin::Layout& layout, float hOffset, float vOffset,
160            const SkPaint& paint, const SkPath& path, size_t start, size_t end) override;
161
162private:
163    struct SaveRec {
164        int              saveCount;
165        SaveFlags::Flags saveFlags;
166        size_t           clipIndex;
167    };
168
169    bool mHighContrastText = false;
170
171    const SaveRec* currentSaveRec() const;
172    void recordPartialSave(SaveFlags::Flags flags);
173
174    template<typename T>
175    void recordClip(const T&, SkRegion::Op);
176    void applyPersistentClips(size_t clipStartIndex);
177
178    void drawPoints(const float* points, int count, const SkPaint& paint,
179            SkCanvas::PointMode mode);
180
181    class Clip;
182
183    sk_sp<SkCanvas>          mCanvas;
184    std::unique_ptr<SkDeque> mSaveStack; // lazily allocated, tracks partial saves.
185    std::vector<Clip>        mClipStack; // tracks persistent clips.
186};
187
188} // namespace android
189
190