1 /* 2 * Copyright 2010 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 GrPlotMgr_DEFINED 9 #define GrPlotMgr_DEFINED 10 11 #include "GrTypes.h" 12 #include "SkTypes.h" 13 14 class GrPlotMgr : SkNoncopyable { 15 public: 16 GrPlotMgr(int width, int height) { 17 fDim.set(width, height); 18 size_t needed = width * height; 19 if (needed <= sizeof(fStorage)) { 20 fBusy = fStorage; 21 } else { 22 fBusy = SkNEW_ARRAY(char, needed); 23 } 24 this->reset(); 25 } 26 27 ~GrPlotMgr() { 28 if (fBusy != fStorage) { 29 delete[] fBusy; 30 } 31 } 32 33 void reset() { 34 sk_bzero(fBusy, fDim.fX * fDim.fY); 35 } 36 37 bool newPlot(SkIPoint16* loc) { 38 char* busy = fBusy; 39 for (int y = 0; y < fDim.fY; y++) { 40 for (int x = 0; x < fDim.fX; x++) { 41 if (!*busy) { 42 *busy = true; 43 loc->set(x, y); 44 return true; 45 } 46 busy++; 47 } 48 } 49 return false; 50 } 51 52 bool isBusy(int x, int y) const { 53 SkASSERT((unsigned)x < (unsigned)fDim.fX); 54 SkASSERT((unsigned)y < (unsigned)fDim.fY); 55 return fBusy[y * fDim.fX + x] != 0; 56 } 57 58 void freePlot(int x, int y) { 59 SkASSERT((unsigned)x < (unsigned)fDim.fX); 60 SkASSERT((unsigned)y < (unsigned)fDim.fY); 61 fBusy[y * fDim.fX + x] = false; 62 } 63 64 private: 65 enum { 66 STORAGE = 64 67 }; 68 char fStorage[STORAGE]; 69 char* fBusy; 70 SkIPoint16 fDim; 71 }; 72 73 #endif 74
