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/*
* 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"
///////////////////////////////////////////////////////////////////////////////
// for testing
#define FONT_CACHE_STATS 0
#if FONT_CACHE_STATS
static int g_UploadCount = 0;
#endif
GrPlot::GrPlot() : fDrawToken(NULL, 0)
, fTexture(NULL)
, fRects(NULL)
, fAtlasMgr(NULL)
, fBytesPerPixel(1)
{
fOffset.set(0, 0);
}
GrPlot::~GrPlot() {
delete fRects;
}
void GrPlot::init(GrAtlasMgr* mgr, int offX, int offY, int width, int height, size_t bpp) {
fRects = GrRectanizer::Factory(width, height);
fAtlasMgr = mgr;
fOffset.set(offX * width, offY * height);
fBytesPerPixel = bpp;
}
static inline void adjust_for_offset(GrIPoint16* loc, const GrIPoint16& offset) {
loc->fX += offset.fX;
loc->fY += offset.fY;
}
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,
const SkISize& backingTextureSize,
int numPlotsX, int numPlotsY) {
fGpu = SkRef(gpu);
fPixelConfig = config;
fBackingTextureSize = backingTextureSize;
fNumPlotsX = numPlotsX;
fNumPlotsY = numPlotsY;
fTexture = NULL;
int plotWidth = fBackingTextureSize.width() / fNumPlotsX;
int plotHeight = fBackingTextureSize.height() / fNumPlotsY;
SkASSERT(plotWidth * fNumPlotsX == fBackingTextureSize.width());
SkASSERT(plotHeight * fNumPlotsY == fBackingTextureSize.height());
// set up allocated plots
size_t bpp = GrBytesPerPixel(fPixelConfig);
fPlotArray = SkNEW_ARRAY(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, x, y, plotWidth, plotHeight, 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 = fBackingTextureSize.width();
desc.fHeight = fBackingTextureSize.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;
}
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