The Tor Browser: comparison gfx/skia/trunk/src/gpu/GrAtlas.cpp

--1:000000000000
+:066ec2b80e73
+/*
+* 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"
+#if 0
+#define GR_PLOT_WIDTH   8
+#define GR_PLOT_HEIGHT  4
+#define GR_ATLAS_WIDTH  256
+#define GR_ATLAS_HEIGHT 256
+#define GR_ATLAS_TEXTURE_WIDTH  (GR_PLOT_WIDTH * GR_ATLAS_WIDTH)
+#define GR_ATLAS_TEXTURE_HEIGHT (GR_PLOT_HEIGHT * GR_ATLAS_HEIGHT)
+#else
+#define GR_ATLAS_TEXTURE_WIDTH  1024
+#define GR_ATLAS_TEXTURE_HEIGHT 2048
+#define GR_ATLAS_WIDTH  256
+#define GR_ATLAS_HEIGHT 256
+#define GR_PLOT_WIDTH   (GR_ATLAS_TEXTURE_WIDTH / GR_ATLAS_WIDTH)
+#define GR_PLOT_HEIGHT  (GR_ATLAS_TEXTURE_HEIGHT / GR_ATLAS_HEIGHT)
+#endif
+///////////////////////////////////////////////////////////////////////////////
+// for testing
+#define FONT_CACHE_STATS 0
+#if FONT_CACHE_STATS
+static int g_UploadCount = 0;
+#endif
+GrPlot::GrPlot() : fDrawToken(NULL, 0)
+, fTexture(NULL)
+, fAtlasMgr(NULL)
+, fBytesPerPixel(1)
+{
+fRects = GrRectanizer::Factory(GR_ATLAS_WIDTH,
+GR_ATLAS_HEIGHT);
+fOffset.set(0, 0);
+}
+GrPlot::~GrPlot() {
+delete fRects;
+}
+static inline void adjust_for_offset(GrIPoint16* loc, const GrIPoint16& offset) {
+loc->fX += offset.fX * GR_ATLAS_WIDTH;
+loc->fY += offset.fY * GR_ATLAS_HEIGHT;
+}
+bool GrPlot::addSubImage(int width, int height, const void* image,
+GrIPoint16* loc) {
+if (!fRects->addRect(width, height, loc)) {
+return false;
+}
+SkAutoSMalloc<1024> storage;
+adjust_for_offset(loc, fOffset);
+GrContext* context = fTexture->getContext();
+// We pass the flag that does not force a flush. We assume our caller is
+// smart and hasn't referenced the part of the texture we're about to update
+// since the last flush.
+context->writeTexturePixels(fTexture,
+loc->fX, loc->fY, width, height,
+fTexture->config(), image, 0,
+GrContext::kDontFlush_PixelOpsFlag);
+#if FONT_CACHE_STATS
+++g_UploadCount;
+#endif
+return true;
+}
+void GrPlot::resetRects() {
+SkASSERT(NULL != fRects);
+fRects->reset();
+}
+///////////////////////////////////////////////////////////////////////////////
+GrAtlasMgr::GrAtlasMgr(GrGpu* gpu, GrPixelConfig config) {
+fGpu = gpu;
+fPixelConfig = config;
+gpu->ref();
+fTexture = NULL;
+// set up allocated plots
+size_t bpp = GrBytesPerPixel(fPixelConfig);
+fPlotArray = SkNEW_ARRAY(GrPlot, (GR_PLOT_WIDTH*GR_PLOT_HEIGHT));
+GrPlot* currPlot = fPlotArray;
+for (int y = GR_PLOT_HEIGHT-1; y >= 0; --y) {
+for (int x = GR_PLOT_WIDTH-1; x >= 0; --x) {
+currPlot->fAtlasMgr = this;
+currPlot->fOffset.set(x, y);
+currPlot->fBytesPerPixel = bpp;
+// build LRU list
+fPlotList.addToHead(currPlot);
+++currPlot;
+}
+}
+}
+GrAtlasMgr::~GrAtlasMgr() {
+SkSafeUnref(fTexture);
+SkDELETE_ARRAY(fPlotArray);
+fGpu->unref();
+#if FONT_CACHE_STATS
+GrPrintf("Num uploads: %d\n", g_UploadCount);
+#endif
+}
+void GrAtlasMgr::moveToHead(GrPlot* plot) {
+if (fPlotList.head() == plot) {
+return;
+}
+fPlotList.remove(plot);
+fPlotList.addToHead(plot);
+};
+GrPlot* GrAtlasMgr::addToAtlas(GrAtlas* atlas,
+int width, int height, const void* image,
+GrIPoint16* 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 = atlas->fPlots.count()-1; i >= 0; --i) {
+GrPlot* plot = atlas->fPlots[i];
+if (plot->addSubImage(width, height, image, loc)) {
+this->moveToHead(plot);
+return plot;
+}
+}
+// before we get a new plot, make sure we have a backing texture
+if (NULL == fTexture) {
+// TODO: Update this to use the cache rather than directly creating a texture.
+GrTextureDesc desc;
+desc.fFlags = kDynamicUpdate_GrTextureFlagBit;
+desc.fWidth = GR_ATLAS_TEXTURE_WIDTH;
+desc.fHeight = GR_ATLAS_TEXTURE_HEIGHT;
+desc.fConfig = fPixelConfig;
+fTexture = fGpu->createTexture(desc, NULL, 0);
+if (NULL == fTexture) {
+return NULL;
+}
+}
+// 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 (NULL != (plot = plotIter.get())) {
+// make sure texture is set for quick lookup
+plot->fTexture = fTexture;
+if (plot->addSubImage(width, height, image, loc)) {
+this->moveToHead(plot);
+// new plot for atlas, put at end of array
+*(atlas->fPlots.append()) = plot;
+return plot;
+}
+plotIter.next();
+}
+// If the above fails, then the current plot list has no room
+return NULL;
+}
+bool GrAtlasMgr::removePlot(GrAtlas* atlas, const GrPlot* plot) {
+// iterate through plot list for this atlas
+int count = atlas->fPlots.count();
+for (int i = 0; i < count; ++i) {
+if (plot == atlas->fPlots[i]) {
+atlas->fPlots.remove(i);
+return true;
+}
+}
+return false;
+}
+// get a plot that's not being used by the current draw
+GrPlot* GrAtlasMgr::getUnusedPlot() {
+GrPlotList::Iter plotIter;
+plotIter.init(fPlotList, GrPlotList::Iter::kTail_IterStart);
+GrPlot* plot;
+while (NULL != (plot = plotIter.get())) {
+if (plot->drawToken().isIssued()) {
+return plot;
+}
+plotIter.prev();
+}
+return NULL;
+}
+SkISize GrAtlas::getSize() const {
+return SkISize::Make(GR_ATLAS_TEXTURE_WIDTH, GR_ATLAS_TEXTURE_HEIGHT);
+}

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comparison: gfx/skia/trunk/src/gpu/GrAtlas.cpp

gfx/skia/trunk/src/gpu/GrAtlas.cpp