bump the size of the atlas id to 64 bits

src/gpu/GrBatchAtlas.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrBatchAtlas.h"
 #include "GrBatchTarget.h"
 #include "GrGpu.h"
 #include "GrRectanizer.h"
 #include "GrTracing.h"
 #include "GrVertexBuffer.h"
 
 static inline void adjust_for_offset(SkIPoint16* loc, const SkIPoint16& offset) {
     loc->fX += offset.fX;
     loc->fY += offset.fY;
 }
 
-static GrBatchAtlas::AtlasID create_id(int index, int generation) {
-    // Generation ID can roll over because we only check for equality
+static GrBatchAtlas::AtlasID create_id(uint32_t index, uint64_t generation) {
     SkASSERT(index < (1 << 16));
+    SkASSERT(generation < ((uint64_t)1 << 48));
     return generation << 16 | index;
 }
 
 // The backing GrTexture for a GrBatchAtlas is broken into a spatial grid of GrBatchPlots.
 // The GrBatchPlots keep track of subimage placement via their GrRectanizer. In turn, a GrBatchPlot
 // manages the lifetime of its data using two tokens, a last ref toke and a last upload token.
 // Once a GrBatchPlot is "full" (i.e. there is no room for the new subimage according to the
 // GrRectanizer), it can no longer be used unless the last ref on the GrPlot has already been
 // flushed through to the gpu.
 
 class BatchPlot : public SkRefCnt {
 public:
     typedef GrBatchAtlas::BatchToken BatchToken;
     
     SK_DECLARE_INTERNAL_LLIST_INTERFACE(BatchPlot);
 
     // index() refers to the index of the plot in the owning GrAtlas's plot array.  genID() is a
     // monotonically incrementing number which is bumped every time the cpu backing store is
     // wiped, or when the plot itself is evicted from the atlas(ie, there is continuity in genID()
     // across atlas spills)
-    int index() const { return fIndex; }
-    int genID() const { return fGenID; }
+    uint32_t index() const { return fIndex; }
+    uint64_t genID() const { return fGenID; }
     GrBatchAtlas::AtlasID id() { return fID; }
 
     GrTexture* texture() const { return fTexture; }
 
     bool addSubImage(int width, int height, const void* image, SkIPoint16* loc, size_t rowBytes)  {
         if (!fRects->addRect(width, height, loc)) {
             return false;
         }
 
         if (!fData) {
@@ skipping 59 matching lines @@
 
         // zero out the plot
         if (fData) {
             sk_bzero(fData, fBytesPerPixel * fWidth * fHeight);
         }
 
         fDirtyRect.setEmpty();
         SkDEBUGCODE(fDirty = false;)
     }
 
-    int x() const { return fX; }
-    int y() const { return fY; }
+    uint32_t x() const { return fX; }
+    uint32_t y() const { return fY; }
 
 private:
     BatchPlot()
         : fLastUpload(0)
         , fLastUse(0)
         , fIndex(-1)
         , fGenID(-1)
         , fID(0)
         , fData(NULL)
         , fWidth(0)
@@ skipping 10 matching lines @@
     {
         fOffset.set(0, 0);
     }
 
     ~BatchPlot() {
         sk_free(fData);
         fData = NULL;
         delete fRects;
     }
 
-    void init(GrBatchAtlas* atlas, GrTexture* texture, int index, uint32_t generation,
+    void init(GrBatchAtlas* atlas, GrTexture* texture, int index, uint64_t generation,
               int offX, int offY, int width, int height, size_t bpp) {
         fIndex = index;
         fGenID = generation;
         fID = create_id(index, generation);
         fWidth = width;
         fHeight = height;
         fX = offX;
         fY = offY;
         fRects = GrRectanizer::Factory(width, height);
         fAtlas = atlas;
         fOffset.set(offX * width, offY * height);
         fBytesPerPixel = bpp;
         fData = NULL;
         fDirtyRect.setEmpty();
         SkDEBUGCODE(fDirty = false;)
         fTexture = texture;
     }
 
     BatchToken fLastUpload;
     BatchToken fLastUse;
 
     uint32_t fIndex;
-    uint32_t fGenID;
+    uint64_t fGenID;
     GrBatchAtlas::AtlasID fID;
     unsigned char* fData;
-    int fWidth;
-    int fHeight;
-    int fX;
-    int fY;
+    uint32_t fWidth;
+    uint32_t fHeight;
+    uint32_t fX;
+    uint32_t fY;
     GrTexture* fTexture;
     GrRectanizer* fRects;
     GrBatchAtlas* fAtlas;
     SkIPoint16 fOffset;        // the offset of the plot in the backing texture
     size_t fBytesPerPixel;
     SkIRect fDirtyRect;
     SkDEBUGCODE(bool fDirty;)
 
     friend class GrBatchAtlas;
 
@@ skipping 23 matching lines @@
 ///////////////////////////////////////////////////////////////////////////////
 
 GrBatchAtlas::GrBatchAtlas(GrTexture* texture, int numPlotsX, int numPlotsY)
     : fTexture(texture)
     , fNumPlotsX(numPlotsX)
     , fNumPlotsY(numPlotsY)
     , fPlotWidth(texture->width() / numPlotsX)
     , fPlotHeight(texture->height() / numPlotsY)
     , fAtlasGeneration(kInvalidAtlasGeneration + 1) {
     SkASSERT(fNumPlotsX * fNumPlotsY <= BulkUseTokenUpdater::kMaxPlots);
-    SkASSERT(fPlotWidth * fNumPlotsX == texture->width());
-    SkASSERT(fPlotHeight * fNumPlotsY == texture->height());
+    SkASSERT(fPlotWidth * fNumPlotsX == static_cast<uint32_t>(texture->width()));
+    SkASSERT(fPlotHeight * fNumPlotsY == static_cast<uint32_t>(texture->height()));
 
     // We currently do not support compressed atlases...
     SkASSERT(!GrPixelConfigIsCompressed(texture->desc().fConfig));
 
     // set up allocated plots
     fBPP = GrBytesPerPixel(texture->desc().fConfig);
     fPlotArray = SkNEW_ARRAY(SkAutoTUnref<BatchPlot>, (fNumPlotsX * fNumPlotsY));
 
     SkAutoTUnref<BatchPlot>* currPlot = fPlotArray;
     for (int y = fNumPlotsY - 1, r = 0; y >= 0; --y, ++r) {
         for (int x = fNumPlotsX - 1, c = 0; x >= 0; --x, ++c) {
-            int id = r * fNumPlotsX + c;
+            uint32_t id = r * fNumPlotsX + c;
             currPlot->reset(SkNEW(BatchPlot));
             (*currPlot)->init(this, texture, id, 1, x, y, fPlotWidth, fPlotHeight, fBPP);
 
             // build LRU list
             fPlotList.addToHead(currPlot->get());
             ++currPlot;
         }
     }
 }
 
@@ skipping 27 matching lines @@
         plot->setLastUploadToken(batchTarget->asapToken());
         SkAutoTUnref<GrPlotUploader> uploader(SkNEW_ARGS(GrPlotUploader, (plot)));
         batchTarget->upload(uploader);
     }
     *id = plot->id();
 }
 
 bool GrBatchAtlas::addToAtlas(AtlasID* id, GrBatchTarget* batchTarget,
                               int width, int height, const void* image, SkIPoint16* loc) {
     // We should already have a texture, TODO clean this up
-    SkASSERT(fTexture && width <= fPlotWidth && height <= fPlotHeight);
+    SkASSERT(fTexture &&
+             static_cast<uint32_t>(width) <= fPlotWidth &&
+             static_cast<uint32_t>(height) <= fPlotHeight);
 
     // now look through all allocated plots for one we can share, in Most Recently Refed order
     GrBatchPlotList::Iter plotIter;
     plotIter.init(fPlotList, GrBatchPlotList::Iter::kHead_IterStart);
     BatchPlot* plot;
     while ((plot = plotIter.get())) {
         if (plot->addSubImage(width, height, image, loc, fBPP * width)) {
             this->updatePlot(batchTarget, id, plot);
             return true;
         }
@@ skipping 23 matching lines @@
     // target so we can spin off the plot
     if (plot->lastUseToken() == batchTarget->currentToken()) {
         return false;
     }
 
     // We take an extra ref here so our plot isn't deleted when we reset its index in the array.
     plot->ref();
     int index = plot->index();
     int x = plot->x();
     int y = plot->y();
-    int generation = plot->genID();
+    uint64_t generation = plot->genID();
 
     this->processEviction(plot->id());
     fPlotList.remove(plot);
     SkAutoTUnref<BatchPlot>& newPlot = fPlotArray[plot->index()];
     newPlot.reset(SkNEW(BatchPlot));
     newPlot->init(this, fTexture, index, ++generation, x, y, fPlotWidth, fPlotHeight, fBPP);
 
     fPlotList.addToHead(newPlot.get());
     SkDEBUGCODE(bool verify = )newPlot->addSubImage(width, height, image, loc, fBPP * width);
     SkASSERT(verify);
     newPlot->setLastUploadToken(batchTarget->currentToken());
     SkAutoTUnref<GrPlotUploader> uploader(SkNEW_ARGS(GrPlotUploader, (newPlot)));
     batchTarget->upload(uploader);
     *id = newPlot->id();
     plot->unref();
     fAtlasGeneration++;
     return true;
 }
 
 bool GrBatchAtlas::hasID(AtlasID id) {
-    int index = GetIndexFromID(id);
+    uint32_t index = GetIndexFromID(id);
     SkASSERT(index < fNumPlotsX * fNumPlotsY);
     return fPlotArray[index]->genID() == GetGenerationFromID(id);
 }
 
 void GrBatchAtlas::setLastUseToken(AtlasID id, BatchToken batchToken) {
     SkASSERT(this->hasID(id));
-    int index = GetIndexFromID(id);
+    uint32_t index = GetIndexFromID(id);
     SkASSERT(index < fNumPlotsX * fNumPlotsY);
     this->makeMRU(fPlotArray[index]);
     fPlotArray[index]->setLastUseToken(batchToken);
 }
 
 void GrBatchAtlas::setLastUseTokenBulk(const BulkUseTokenUpdater& updater, BatchToken batchToken) {
     int count = updater.fPlotsToUpdate.count();
     for (int i = 0; i < count; i++) {
         BatchPlot* plot = fPlotArray[updater.fPlotsToUpdate[i]];
         this->makeMRU(plot);
         plot->setLastUseToken(batchToken);
     }
 }