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      1 
      2 /*
      3  * Copyright 2010 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 
      9 
     10 
     11 #ifndef GrPlotMgr_DEFINED
     12 #define GrPlotMgr_DEFINED
     13 
     14 #include "GrTypes.h"
     15 #include "GrPoint.h"
     16 
     17 class GrPlotMgr : GrNoncopyable {
     18 public:
     19     GrPlotMgr(int width, int height) {
     20         fDim.set(width, height);
     21         size_t needed = width * height;
     22         if (needed <= sizeof(fStorage)) {
     23             fBusy = fStorage;
     24         } else {
     25             fBusy = new char[needed];
     26         }
     27         this->reset();
     28     }
     29 
     30     ~GrPlotMgr() {
     31         if (fBusy != fStorage) {
     32             delete[] fBusy;
     33         }
     34     }
     35 
     36     void reset() {
     37         Gr_bzero(fBusy, fDim.fX * fDim.fY);
     38     }
     39 
     40     bool newPlot(GrIPoint16* loc) {
     41         char* busy = fBusy;
     42         for (int y = 0; y < fDim.fY; y++) {
     43             for (int x = 0; x < fDim.fX; x++) {
     44                 if (!*busy) {
     45                     *busy = true;
     46                     loc->set(x, y);
     47                     return true;
     48                 }
     49                 busy++;
     50             }
     51         }
     52         return false;
     53     }
     54 
     55     bool isBusy(int x, int y) const {
     56         GrAssert((unsigned)x < (unsigned)fDim.fX);
     57         GrAssert((unsigned)y < (unsigned)fDim.fY);
     58         return fBusy[y * fDim.fX + x] != 0;
     59     }
     60 
     61     void freePlot(int x, int y) {
     62         GrAssert((unsigned)x < (unsigned)fDim.fX);
     63         GrAssert((unsigned)y < (unsigned)fDim.fY);
     64         fBusy[y * fDim.fX + x] = false;
     65     }
     66 
     67 private:
     68     enum {
     69         STORAGE = 64
     70     };
     71     char fStorage[STORAGE];
     72     char* fBusy;
     73     GrIPoint16  fDim;
     74 };
     75 
     76 #endif
     77 
     78