1 /* 2 * Copyright 2014 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef GrLayerHoister_DEFINED 9 #define GrLayerHoister_DEFINED 10 11 #include "SkPicture.h" 12 #include "SkTDArray.h" 13 14 class GrAccelData; 15 struct GrCachedLayer; 16 class GrReplacements; 17 struct SkRect; 18 19 // This class collects the layer hoisting functionality in one place. 20 // For each picture rendering: 21 // FindLayersToHoist should be called once to collect the required layers 22 // DrawLayers should be called once to render them 23 // UnlockLayers should be called once to allow the texture resources to be recycled 24 class GrLayerHoister { 25 public: 26 struct HoistedLayer { 27 const SkPicture* fPicture; 28 GrCachedLayer* fLayer; 29 }; 30 31 /** Find the layers in 'topLevelPicture' that need hoisting. Note that the discovered 32 layers can be inside nested sub-pictures. 33 @param topLevelPicture The top-level picture that is about to be rendered 34 @param query The rectangle that is about to be drawn. 35 @param atlased Out parameter storing the layers that should be hoisted to the atlas 36 @param nonAtlased Out parameter storing the layers that should be hoisted stand alone 37 @param layerCache The source of new layers 38 Return true if any layers are suitable for hoisting; false otherwise 39 */ 40 static bool FindLayersToHoist(const SkPicture* topLevelPicture, 41 const SkRect& query, 42 SkTDArray<HoistedLayer>* altased, 43 SkTDArray<HoistedLayer>* nonAtlased, 44 GrLayerCache* layerCache); 45 46 /** Draw the specified layers into either the atlas or free floating textures. 47 @param atlased The layers to be drawn into the atlas 48 @param nonAtlased The layers to be drawn into their own textures 49 @oaram replacements The replacement structure to fill in with the rendered layer info 50 */ 51 static void DrawLayers(const SkTDArray<HoistedLayer>& atlased, 52 const SkTDArray<HoistedLayer>& nonAtlased, 53 GrReplacements* replacements); 54 55 /** Unlock unneeded layers in the layer cache. 56 @param layerCache holder of the locked layers 57 @param atlased Unneeded layers in the atlas 58 @param nonAtlased Unneeded layers in their own textures 59 */ 60 static void UnlockLayers(GrLayerCache* layerCache, 61 const SkTDArray<HoistedLayer>& atlased, 62 const SkTDArray<HoistedLayer>& nonAtlased); 63 }; 64 65 #endif 66
