Clean up GrAtlas and rename it GrLayerAtlas

src/gpu/GrAtlas.cpp

-
-/*
- * Copyright 2010 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "GrAtlas.h"
-#include "GrContext.h"
-#include "GrGpu.h"
-#include "GrRectanizer.h"
-#include "GrTracing.h"
-
-///////////////////////////////////////////////////////////////////////////////
-
-// for testing
-#define FONT_CACHE_STATS 0
-#if FONT_CACHE_STATS
-static int g_UploadCount = 0;
-#endif
-
-GrPlot::GrPlot() 
-    : fID(-1)
-    , fTexture(nullptr)
-    , fRects(nullptr)
-    , fAtlas(nullptr)
-    , fBytesPerPixel(1)
-    , fDirty(false)
-    , fBatchUploads(false)
-{
-    fOffset.set(0, 0);
-}
-
-GrPlot::~GrPlot() {
-    delete[] fPlotData;
-    fPlotData = nullptr;
-    delete fRects;
-}
-
-void GrPlot::init(GrAtlas* atlas, int id, int offX, int offY, int width, int height, size_t bpp,
-                  bool batchUploads) {
-    fID = id;
-    fRects = GrRectanizer::Factory(width, height);
-    fAtlas = atlas;
-    fOffset.set(offX * width, offY * height);
-    fBytesPerPixel = bpp;
-    fPlotData = nullptr;
-    fDirtyRect.setEmpty();
-    fDirty = false;
-    fBatchUploads = batchUploads;
-}
-
-static inline void adjust_for_offset(SkIPoint16* loc, const SkIPoint16& offset) {
-    loc->fX += offset.fX;
-    loc->fY += offset.fY;
-}
-
-bool GrPlot::addSubImage(int width, int height, const void* image, SkIPoint16* loc) {
-    float percentFull = fRects->percentFull();
-    if (!fRects->addRect(width, height, loc)) {
-        return false;
-    }
-
-    // if batching uploads, create backing memory on first use
-    // once the plot is nearly full we will revert to uploading each subimage individually
-    int plotWidth = fRects->width();
-    int plotHeight = fRects->height();
-    if (fBatchUploads && nullptr == fPlotData && 0.0f == percentFull) {
-        fPlotData = new unsigned char[fBytesPerPixel * plotWidth * plotHeight];
-        memset(fPlotData, 0, fBytesPerPixel*plotWidth*plotHeight);
-    }
-
-    // if we have backing memory, copy to the memory and set for future upload
-    if (fPlotData) {
-        const unsigned char* imagePtr = (const unsigned char*) image;
-        // point ourselves at the right starting spot
-        unsigned char* dataPtr = fPlotData;
-        dataPtr += fBytesPerPixel*plotWidth*loc->fY;
-        dataPtr += fBytesPerPixel*loc->fX;
-        // copy into the data buffer
-        for (int i = 0; i < height; ++i) {
-            memcpy(dataPtr, imagePtr, fBytesPerPixel*width);
-            dataPtr += fBytesPerPixel*plotWidth;
-            imagePtr += fBytesPerPixel*width;
-        }
-
-        fDirtyRect.join(loc->fX, loc->fY, loc->fX + width, loc->fY + height);
-        adjust_for_offset(loc, fOffset);
-        fDirty = true;
-    // otherwise, just upload the image directly
-    } else if (image) {
-        adjust_for_offset(loc, fOffset);
-        TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("skia.gpu"), "GrPlot::uploadToTexture");
-        fTexture->writePixels(loc->fX, loc->fY, width, height, fTexture->config(), image, 0,
-                              GrContext::kDontFlush_PixelOpsFlag);
-    } else {
-        adjust_for_offset(loc, fOffset);
-    }
-
-#if FONT_CACHE_STATS
-    ++g_UploadCount;
-#endif
-
-    return true;
-}
-
-void GrPlot::resetRects() {
-    SkASSERT(fRects);
-    fRects->reset();
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-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 = nullptr;
-
-    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;
-        }
-    }
-}
-
-GrAtlas::~GrAtlas() {
-    SkSafeUnref(fTexture);
-    delete[] fPlotArray;
-
-    fGpu->unref();
-#if FONT_CACHE_STATS
-      SkDebugf("Num uploads: %d\n", g_UploadCount);
-#endif
-}
-
-void GrAtlas::makeMRU(GrPlot* plot) {
-    if (fPlotList.head() == plot) {
-        return;
-    }
-
-    fPlotList.remove(plot);
-    fPlotList.addToHead(plot);
-};
-
-GrPlot* GrAtlas::addToAtlas(ClientPlotUsage* usage,
-                            int width, int height, const void* image,
-                            SkIPoint16* loc) {
-    // iterate through entire plot list for this atlas, see if we can find a hole
-    // last one was most recently added and probably most empty
-    for (int i = usage->fPlots.count()-1; i >= 0; --i) {
-        GrPlot* plot = usage->fPlots[i];
-        // client may have plots from more than one atlas, must check for ours before adding
-        if (this == plot->fAtlas && plot->addSubImage(width, height, image, loc)) {
-            this->makeMRU(plot);
-            return plot;
-        }
-    }
-
-    // before we get a new plot, make sure we have a backing texture
-    if (nullptr == fTexture) {
-        // TODO: Update this to use the cache rather than directly creating a texture.
-        GrSurfaceDesc desc;
-        desc.fFlags = fFlags;
-        desc.fWidth = fBackingTextureSize.width();
-        desc.fHeight = fBackingTextureSize.height();
-        desc.fConfig = fPixelConfig;
-
-        fTexture = fGpu->createTexture(desc, true, nullptr, 0);
-        if (nullptr == fTexture) {
-            return nullptr;
-        }
-    }
-
-    // now look through all allocated plots for one we can share, in MRU order
-    GrPlotList::Iter plotIter;
-    plotIter.init(fPlotList, GrPlotList::Iter::kHead_IterStart);
-    GrPlot* plot;
-    while ((plot = plotIter.get())) {
-        // make sure texture is set for quick lookup
-        plot->fTexture = fTexture;
-        if (plot->addSubImage(width, height, image, loc)) {
-            this->makeMRU(plot);
-            // new plot for atlas, put at end of array
-            SkASSERT(!usage->fPlots.contains(plot));
-            *(usage->fPlots.append()) = plot;
-            return plot;
-        }
-        plotIter.next();
-    }
-
-    // If the above fails, then the current plot list has no room
-    return nullptr;
-}
-
-void GrAtlas::RemovePlot(ClientPlotUsage* usage, const GrPlot* plot) {
-    int index = usage->fPlots.find(const_cast<GrPlot*>(plot));
-    if (index >= 0) {
-        usage->fPlots.remove(index);
-    }
-}