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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"
#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(NULL)
, fRects(NULL)
, fAtlas(NULL)
, fBytesPerPixel(1)
, fDirty(false)
, fBatchUploads(false)
{
fOffset.set(0, 0);
}
GrPlot::~GrPlot() {
delete[] fPlotData;
fPlotData = NULL;
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 = NULL;
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 && NULL == 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 = 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;
}
}
}
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 (NULL == 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, 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 ((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 NULL;
}
void GrAtlas::RemovePlot(ClientPlotUsage* usage, const GrPlot* plot) {
int index = usage->fPlots.find(const_cast<GrPlot*>(plot));
if (index >= 0) {
usage->fPlots.remove(index);
}
}
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