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      1 /*
      2  * Copyright (C) 2015 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 
     17 #pragma once
     18 
     19 #include "BakedOpState.h"
     20 #include "Matrix.h"
     21 #include "utils/Macros.h"
     22 
     23 namespace android {
     24 namespace uirenderer {
     25 
     26 class Caches;
     27 struct Glop;
     28 class Layer;
     29 class RenderState;
     30 struct ClipBase;
     31 
     32 /**
     33  * Main rendering manager for a collection of work - one frame + any contained FBOs.
     34  *
     35  * Manages frame and FBO lifecycle, binding the GL framebuffer as appropriate. This is the only
     36  * place where FBOs are bound, created, and destroyed.
     37  *
     38  * All rendering operations will be sent by the Dispatcher, a collection of static methods,
     39  * which has intentionally limited access to the renderer functionality.
     40  */
     41 class BakedOpRenderer {
     42 public:
     43     typedef void (*GlopReceiver)(BakedOpRenderer&, const Rect*, const ClipBase*, const Glop&);
     44     /**
     45      * Position agnostic shadow lighting info. Used with all shadow ops in scene.
     46      */
     47     struct LightInfo {
     48         LightInfo() : LightInfo(0, 0) {}
     49         LightInfo(uint8_t ambientShadowAlpha,
     50                 uint8_t spotShadowAlpha)
     51                 : ambientShadowAlpha(ambientShadowAlpha)
     52                 , spotShadowAlpha(spotShadowAlpha) {}
     53         uint8_t ambientShadowAlpha;
     54         uint8_t spotShadowAlpha;
     55     };
     56 
     57     BakedOpRenderer(Caches& caches, RenderState& renderState, bool opaque,
     58             const LightInfo& lightInfo)
     59             : mGlopReceiver(DefaultGlopReceiver)
     60             , mRenderState(renderState)
     61             , mCaches(caches)
     62             , mOpaque(opaque)
     63             , mLightInfo(lightInfo) {
     64     }
     65 
     66     RenderState& renderState() { return mRenderState; }
     67     Caches& caches() { return mCaches; }
     68 
     69     void startFrame(uint32_t width, uint32_t height, const Rect& repaintRect);
     70     void endFrame(const Rect& repaintRect);
     71     WARN_UNUSED_RESULT OffscreenBuffer* startTemporaryLayer(uint32_t width, uint32_t height);
     72     void recycleTemporaryLayer(OffscreenBuffer* offscreenBuffer);
     73     void startRepaintLayer(OffscreenBuffer* offscreenBuffer, const Rect& repaintRect);
     74     void endLayer();
     75     WARN_UNUSED_RESULT OffscreenBuffer* copyToLayer(const Rect& area);
     76 
     77     Texture* getTexture(const SkBitmap* bitmap);
     78     const LightInfo& getLightInfo() const { return mLightInfo; }
     79 
     80     void renderGlop(const BakedOpState& state, const Glop& glop) {
     81         renderGlop(&state.computedState.clippedBounds,
     82                 state.computedState.getClipIfNeeded(),
     83                 glop);
     84     }
     85     void renderFunctor(const FunctorOp& op, const BakedOpState& state);
     86 
     87     void renderGlop(const Rect* dirtyBounds, const ClipBase* clip, const Glop& glop) {
     88         mGlopReceiver(*this, dirtyBounds, clip, glop);
     89     }
     90     bool offscreenRenderTarget() { return mRenderTarget.offscreenBuffer != nullptr; }
     91     void dirtyRenderTarget(const Rect& dirtyRect);
     92     bool didDraw() const { return mHasDrawn; }
     93 
     94     uint32_t getViewportWidth() const { return mRenderTarget.viewportWidth; }
     95     uint32_t getViewportHeight() const { return mRenderTarget.viewportHeight; }
     96 
     97     // simple draw methods, to be used for end frame decoration
     98     void drawRect(float left, float top, float right, float bottom, const SkPaint* paint) {
     99         float ltrb[4] = { left, top, right, bottom };
    100         drawRects(ltrb, 4, paint);
    101     }
    102     void drawRects(const float* rects, int count, const SkPaint* paint);
    103 protected:
    104     GlopReceiver mGlopReceiver;
    105 private:
    106     static void DefaultGlopReceiver(BakedOpRenderer& renderer, const Rect* dirtyBounds,
    107             const ClipBase* clip, const Glop& glop) {
    108         renderer.renderGlopImpl(dirtyBounds, clip, glop);
    109     }
    110     void renderGlopImpl(const Rect* dirtyBounds, const ClipBase* clip, const Glop& glop);
    111     void setViewport(uint32_t width, uint32_t height);
    112     void clearColorBuffer(const Rect& clearRect);
    113     void prepareRender(const Rect* dirtyBounds, const ClipBase* clip);
    114     void setupStencilRectList(const ClipBase* clip);
    115     void setupStencilRegion(const ClipBase* clip);
    116     void setupStencilQuads(std::vector<Vertex>& quadVertices, int incrementThreshold);
    117 
    118     RenderState& mRenderState;
    119     Caches& mCaches;
    120     bool mOpaque;
    121     bool mHasDrawn = false;
    122 
    123     // render target state - setup by start/end layer/frame
    124     // only valid to use in between start/end pairs.
    125     struct {
    126         // If not drawing to a layer: fbo = 0, offscreenBuffer = null,
    127         // Otherwise these refer to currently painting layer's state
    128         GLuint frameBufferId = 0;
    129         OffscreenBuffer* offscreenBuffer = nullptr;
    130 
    131         // Used when drawing to a layer and using stencil clipping. otherwise null.
    132         RenderBuffer* stencil = nullptr;
    133 
    134         // value representing the ClipRectList* or ClipRegion* currently stored in
    135         // the stencil of the current render target
    136         const ClipBase* lastStencilClip = nullptr;
    137 
    138         // Size of renderable region in current render target - for layers, may not match actual
    139         // bounds of FBO texture. offscreenBuffer->texture has this information.
    140         uint32_t viewportWidth = 0;
    141         uint32_t viewportHeight = 0;
    142 
    143         Matrix4 orthoMatrix;
    144     } mRenderTarget;
    145 
    146     const LightInfo mLightInfo;
    147 };
    148 
    149 }; // namespace uirenderer
    150 }; // namespace android
    151