michael@0: /*
michael@0:  * Copyright 2010 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #ifndef GrPlotMgr_DEFINED
michael@0: #define GrPlotMgr_DEFINED
michael@0: 
michael@0: #include "GrTypes.h"
michael@0: #include "GrPoint.h"
michael@0: #include "SkTypes.h"
michael@0: 
michael@0: class GrPlotMgr : public SkNoncopyable {
michael@0: public:
michael@0:     GrPlotMgr(int width, int height) {
michael@0:         fDim.set(width, height);
michael@0:         size_t needed = width * height;
michael@0:         if (needed <= sizeof(fStorage)) {
michael@0:             fBusy = fStorage;
michael@0:         } else {
michael@0:             fBusy = SkNEW_ARRAY(char, needed);
michael@0:         }
michael@0:         this->reset();
michael@0:     }
michael@0: 
michael@0:     ~GrPlotMgr() {
michael@0:         if (fBusy != fStorage) {
michael@0:             delete[] fBusy;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     void reset() {
michael@0:         sk_bzero(fBusy, fDim.fX * fDim.fY);
michael@0:     }
michael@0: 
michael@0:     bool newPlot(GrIPoint16* loc) {
michael@0:         char* busy = fBusy;
michael@0:         for (int y = 0; y < fDim.fY; y++) {
michael@0:             for (int x = 0; x < fDim.fX; x++) {
michael@0:                 if (!*busy) {
michael@0:                     *busy = true;
michael@0:                     loc->set(x, y);
michael@0:                     return true;
michael@0:                 }
michael@0:                 busy++;
michael@0:             }
michael@0:         }
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     bool isBusy(int x, int y) const {
michael@0:         SkASSERT((unsigned)x < (unsigned)fDim.fX);
michael@0:         SkASSERT((unsigned)y < (unsigned)fDim.fY);
michael@0:         return fBusy[y * fDim.fX + x] != 0;
michael@0:     }
michael@0: 
michael@0:     void freePlot(int x, int y) {
michael@0:         SkASSERT((unsigned)x < (unsigned)fDim.fX);
michael@0:         SkASSERT((unsigned)y < (unsigned)fDim.fY);
michael@0:         fBusy[y * fDim.fX + x] = false;
michael@0:     }
michael@0: 
michael@0: private:
michael@0:     enum {
michael@0:         STORAGE = 64
michael@0:     };
michael@0:     char fStorage[STORAGE];
michael@0:     char* fBusy;
michael@0:     GrIPoint16  fDim;
michael@0: };
michael@0: 
michael@0: #endif