1 /* 2 Copyright 2010 Google Inc. 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 18 #ifndef GrPlotMgr_DEFINED 19 #define GrPlotMgr_DEFINED 20 21 #include "GrTypes.h" 22 #include "GrPoint.h" 23 24 class GrPlotMgr : GrNoncopyable { 25 public: 26 GrPlotMgr(int width, int height) { 27 fDim.set(width, height); 28 size_t needed = width * height; 29 if (needed <= sizeof(fStorage)) { 30 fBusy = fStorage; 31 } else { 32 fBusy = new char[needed]; 33 } 34 this->reset(); 35 } 36 37 ~GrPlotMgr() { 38 if (fBusy != fStorage) { 39 delete[] fBusy; 40 } 41 } 42 43 void reset() { 44 Gr_bzero(fBusy, fDim.fX * fDim.fY); 45 } 46 47 bool newPlot(GrIPoint16* loc) { 48 char* busy = fBusy; 49 for (int y = 0; y < fDim.fY; y++) { 50 for (int x = 0; x < fDim.fX; x++) { 51 if (!*busy) { 52 *busy = true; 53 loc->set(x, y); 54 return true; 55 } 56 busy++; 57 } 58 } 59 return false; 60 } 61 62 bool isBusy(int x, int y) const { 63 GrAssert((unsigned)x < (unsigned)fDim.fX); 64 GrAssert((unsigned)y < (unsigned)fDim.fY); 65 return fBusy[y * fDim.fX + x] != 0; 66 } 67 68 void freePlot(int x, int y) { 69 GrAssert((unsigned)x < (unsigned)fDim.fX); 70 GrAssert((unsigned)y < (unsigned)fDim.fY); 71 fBusy[y * fDim.fX + x] = false; 72 } 73 74 private: 75 enum { 76 STORAGE = 64 77 }; 78 char fStorage[STORAGE]; 79 char* fBusy; 80 GrIPoint16 fDim; 81 }; 82 83 #endif 84 85
