GrAtlas::GrAtlas(GrGpu* gpu, GrPixelConfig config, GrSurfaceFlags flags,
const SkISize& backingTextureSize,
int numPlotsX, int numPlotsY, bool batchUploads) {
fGpu = SkRef(gpu);
fPixelConfig = config;
fFlags = flags;
fBackingTextureSize = backingTextureSize;
fNumPlotsX = numPlotsX;
fNumPlotsY = numPlotsY;
fBatchUploads = batchUploads;
fTexture = NULL;
int textureWidth = fBackingTextureSize.width();
int textureHeight = fBackingTextureSize.height();
int plotWidth = textureWidth / fNumPlotsX;
int plotHeight = textureHeight / fNumPlotsY;
SkASSERT(plotWidth * fNumPlotsX == textureWidth);
SkASSERT(plotHeight * fNumPlotsY == textureHeight);
// We currently do not support compressed atlases...
SkASSERT(!GrPixelConfigIsCompressed(config));
// set up allocated plots
size_t bpp = GrBytesPerPixel(fPixelConfig);
fPlotArray = new GrPlot[(fNumPlotsX * fNumPlotsY)];
GrPlot* currPlot = fPlotArray;
for (int y = numPlotsY-1; y >= 0; --y) {
for (int x = numPlotsX-1; x >= 0; --x) {
currPlot->init(this, y*numPlotsX+x, x, y, plotWidth, plotHeight, bpp, batchUploads);
// build LRU list
fPlotList.addToHead(currPlot);
++currPlot;
}
}
}
