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 #include "GrPathRange.h" 9 #include "SkPath.h" 10 11 enum { 12 kPathsPerGroup = 16 // Paths get tracked in groups of 16 for lazy loading. 13 }; 14 15 GrPathRange::GrPathRange(GrGpu* gpu, 16 PathGenerator* pathGenerator, 17 const SkStrokeRec& stroke) 18 : INHERITED(gpu, kIsWrapped), 19 fPathGenerator(SkRef(pathGenerator)), 20 fNumPaths(fPathGenerator->getNumPaths()), 21 fStroke(stroke) { 22 const int numGroups = (fNumPaths + kPathsPerGroup - 1) / kPathsPerGroup; 23 fGeneratedPaths.reset((numGroups + 7) / 8); // 1 bit per path group. 24 memset(&fGeneratedPaths.front(), 0, fGeneratedPaths.count()); 25 } 26 27 GrPathRange::GrPathRange(GrGpu* gpu, 28 int numPaths, 29 const SkStrokeRec& stroke) 30 : INHERITED(gpu, kIsWrapped), 31 fNumPaths(numPaths), 32 fStroke(stroke) { 33 } 34 35 void GrPathRange::willDrawPaths(const uint32_t indices[], int count) const { 36 if (NULL == fPathGenerator.get()) { 37 return; 38 } 39 40 bool didLoadPaths = false; 41 42 for (int i = 0; i < count; ++i) { 43 SkASSERT(indices[i] < static_cast<uint32_t>(fNumPaths)); 44 45 const int groupIndex = indices[i] / kPathsPerGroup; 46 const int groupByte = groupIndex / 8; 47 const uint8_t groupBit = 1 << (groupIndex % 8); 48 49 const bool hasPath = SkToBool(fGeneratedPaths[groupByte] & groupBit); 50 if (!hasPath) { 51 // We track which paths are loaded in groups of kPathsPerGroup. To 52 // mark a path as loaded we need to load the entire group. 53 const int groupFirstPath = groupIndex * kPathsPerGroup; 54 const int groupLastPath = SkTMin(groupFirstPath + kPathsPerGroup, fNumPaths) - 1; 55 56 SkPath path; 57 for (int pathIdx = groupFirstPath; pathIdx <= groupLastPath; ++pathIdx) { 58 fPathGenerator->generatePath(pathIdx, &path); 59 this->onInitPath(pathIdx, path); 60 } 61 62 fGeneratedPaths[groupByte] |= groupBit; 63 didLoadPaths = true; 64 } 65 } 66 67 if (didLoadPaths) { 68 this->didChangeGpuMemorySize(); 69 } 70 } 71
