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 GrRectanizer_skyline_DEFINED 9 #define GrRectanizer_skyline_DEFINED 10 11 #include "GrRectanizer.h" 12 #include "SkTDArray.h" 13 14 // Pack rectangles and track the current silhouette 15 // Based, in part, on Jukka Jylanki's work at http://clb.demon.fi 16 class GrRectanizerSkyline : public GrRectanizer { 17 public: 18 GrRectanizerSkyline(int w, int h) : INHERITED(w, h) { 19 this->reset(); 20 } 21 22 ~GrRectanizerSkyline() override { } 23 24 void reset() override { 25 fAreaSoFar = 0; 26 fSkyline.reset(); 27 SkylineSegment* seg = fSkyline.append(1); 28 seg->fX = 0; 29 seg->fY = 0; 30 seg->fWidth = this->width(); 31 } 32 33 bool addRect(int w, int h, SkIPoint16* loc) override; 34 35 float percentFull() const override { 36 return fAreaSoFar / ((float)this->width() * this->height()); 37 } 38 39 private: 40 struct SkylineSegment { 41 int fX; 42 int fY; 43 int fWidth; 44 }; 45 46 SkTDArray<SkylineSegment> fSkyline; 47 48 int32_t fAreaSoFar; 49 50 // Can a width x height rectangle fit in the free space represented by 51 // the skyline segments >= 'skylineIndex'? If so, return true and fill in 52 // 'y' with the y-location at which it fits (the x location is pulled from 53 // 'skylineIndex's segment. 54 bool rectangleFits(int skylineIndex, int width, int height, int* y) const; 55 // Update the skyline structure to include a width x height rect located 56 // at x,y. 57 void addSkylineLevel(int skylineIndex, int x, int y, int width, int height); 58 59 typedef GrRectanizer INHERITED; 60 }; 61 62 #endif 63
