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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrBatchFontCache.h"
#include "GrContext.h"
#include "GrFontAtlasSizes.h"
#include "GrGpu.h"
#include "GrRectanizer.h"
#include "GrSurfacePriv.h"
#include "SkString.h"
#include "SkDistanceFieldGen.h"
///////////////////////////////////////////////////////////////////////////////
static GrBatchAtlas* make_atlas(GrContext* context, GrPixelConfig config,
int textureWidth, int textureHeight,
int numPlotsX, int numPlotsY) {
GrSurfaceDesc desc;
desc.fFlags = kNone_GrSurfaceFlags;
desc.fWidth = textureWidth;
desc.fHeight = textureHeight;
desc.fConfig = config;
// We don't want to flush the context so we claim we're in the middle of flushing so as to
// guarantee we do not recieve a texture with pending IO
GrTexture* texture = context->textureProvider()->refScratchTexture(
desc, GrTextureProvider::kApprox_ScratchTexMatch, true);
if (!texture) {
return NULL;
}
return SkNEW_ARGS(GrBatchAtlas, (texture, numPlotsX, numPlotsY));
}
bool GrBatchFontCache::initAtlas(GrMaskFormat format) {
int index = MaskFormatToAtlasIndex(format);
if (!fAtlases[index]) {
GrPixelConfig config = this->getPixelConfig(format);
if (kA8_GrMaskFormat == format) {
fAtlases[index] = make_atlas(fContext, config,
GR_FONT_ATLAS_A8_TEXTURE_WIDTH,
GR_FONT_ATLAS_TEXTURE_HEIGHT,
GR_FONT_ATLAS_A8_NUM_PLOTS_X,
GR_FONT_ATLAS_NUM_PLOTS_Y);
} else {
fAtlases[index] = make_atlas(fContext, config,
GR_FONT_ATLAS_TEXTURE_WIDTH,
GR_FONT_ATLAS_TEXTURE_HEIGHT,
GR_FONT_ATLAS_NUM_PLOTS_X,
GR_FONT_ATLAS_NUM_PLOTS_Y);
}
// Atlas creation can fail
if (fAtlases[index]) {
fAtlases[index]->registerEvictionCallback(&GrBatchFontCache::HandleEviction,
(void*)this);
} else {
return false;
}
}
return true;
}
GrBatchFontCache::GrBatchFontCache(GrContext* context)
: fContext(context)
, fPreserveStrike(NULL) {
for (int i = 0; i < kMaskFormatCount; ++i) {
fAtlases[i] = NULL;
}
}
GrBatchFontCache::~GrBatchFontCache() {
SkTDynamicHash<GrBatchTextStrike, GrFontDescKey>::Iter iter(&fCache);
while (!iter.done()) {
(*iter).fIsAbandoned = true;
(*iter).unref();
++iter;
}
for (int i = 0; i < kMaskFormatCount; ++i) {
SkDELETE(fAtlases[i]);
}
}
void GrBatchFontCache::freeAll() {
SkTDynamicHash<GrBatchTextStrike, GrFontDescKey>::Iter iter(&fCache);
while (!iter.done()) {
(*iter).fIsAbandoned = true;
(*iter).unref();
++iter;
}
fCache.rewind();
for (int i = 0; i < kMaskFormatCount; ++i) {
SkDELETE(fAtlases[i]);
fAtlases[i] = NULL;
}
}
GrPixelConfig GrBatchFontCache::getPixelConfig(GrMaskFormat format) const {
static const GrPixelConfig kPixelConfigs[] = {
kAlpha_8_GrPixelConfig,
kRGB_565_GrPixelConfig,
kSkia8888_GrPixelConfig
};
SK_COMPILE_ASSERT(SK_ARRAY_COUNT(kPixelConfigs) == kMaskFormatCount, array_size_mismatch);
return kPixelConfigs[format];
}
void GrBatchFontCache::HandleEviction(GrBatchAtlas::AtlasID id, void* ptr) {
GrBatchFontCache* fontCache = reinterpret_cast<GrBatchFontCache*>(ptr);
SkTDynamicHash<GrBatchTextStrike, GrFontDescKey>::Iter iter(&fontCache->fCache);
for (; !iter.done(); ++iter) {
GrBatchTextStrike* strike = &*iter;
strike->removeID(id);
// clear out any empty strikes. We will preserve the strike whose call to addToAtlas
// triggered the eviction
if (strike != fontCache->fPreserveStrike && 0 == strike->fAtlasedGlyphs) {
fontCache->fCache.remove(*(strike->fFontScalerKey));
strike->fIsAbandoned = true;
strike->unref();
}
}
}
void GrBatchFontCache::dump() const {
static int gDumpCount = 0;
for (int i = 0; i < kMaskFormatCount; ++i) {
if (fAtlases[i]) {
GrTexture* texture = fAtlases[i]->getTexture();
if (texture) {
SkString filename;
#ifdef SK_BUILD_FOR_ANDROID
filename.printf("/sdcard/fontcache_%d%d.png", gDumpCount, i);
#else
filename.printf("fontcache_%d%d.png", gDumpCount, i);
#endif
texture->surfacePriv().savePixels(filename.c_str());
}
}
}
++gDumpCount;
}
///////////////////////////////////////////////////////////////////////////////
/*
The text strike is specific to a given font/style/matrix setup, which is
represented by the GrHostFontScaler object we are given in getGlyph().
We map a 32bit glyphID to a GrGlyph record, which in turn points to a
atlas and a position within that texture.
*/
GrBatchTextStrike::GrBatchTextStrike(GrBatchFontCache* cache, const GrFontDescKey* key)
: fFontScalerKey(SkRef(key))
, fPool(9/*start allocations at 512 bytes*/)
, fAtlasedGlyphs(0)
, fIsAbandoned(false) {
fBatchFontCache = cache; // no need to ref, it won't go away before we do
}
GrBatchTextStrike::~GrBatchTextStrike() {
SkTDynamicHash<GrGlyph, GrGlyph::PackedID>::Iter iter(&fCache);
while (!iter.done()) {
(*iter).free();
++iter;
}
}
GrGlyph* GrBatchTextStrike::generateGlyph(GrGlyph::PackedID packed,
GrFontScaler* scaler) {
SkIRect bounds;
if (GrGlyph::kDistance_MaskStyle == GrGlyph::UnpackMaskStyle(packed)) {
if (!scaler->getPackedGlyphDFBounds(packed, &bounds)) {
return NULL;
}
} else {
if (!scaler->getPackedGlyphBounds(packed, &bounds)) {
return NULL;
}
}
GrMaskFormat format = scaler->getPackedGlyphMaskFormat(packed);
GrGlyph* glyph = (GrGlyph*)fPool.alloc(sizeof(GrGlyph), SK_MALLOC_THROW);
glyph->init(packed, bounds, format);
fCache.add(glyph);
return glyph;
}
void GrBatchTextStrike::removeID(GrBatchAtlas::AtlasID id) {
SkTDynamicHash<GrGlyph, GrGlyph::PackedID>::Iter iter(&fCache);
while (!iter.done()) {
if (id == (*iter).fID) {
(*iter).fID = GrBatchAtlas::kInvalidAtlasID;
fAtlasedGlyphs--;
SkASSERT(fAtlasedGlyphs >= 0);
}
++iter;
}
}
bool GrBatchTextStrike::addGlyphToAtlas(GrBatchTarget* batchTarget, GrGlyph* glyph,
GrFontScaler* scaler) {
SkASSERT(glyph);
SkASSERT(scaler);
SkASSERT(fCache.find(glyph->fPackedID));
SkASSERT(NULL == glyph->fPlot);
SkAutoUnref ar(SkSafeRef(scaler));
int bytesPerPixel = GrMaskFormatBytesPerPixel(glyph->fMaskFormat);
size_t size = glyph->fBounds.area() * bytesPerPixel;
SkAutoSMalloc<1024> storage(size);
if (GrGlyph::kDistance_MaskStyle == GrGlyph::UnpackMaskStyle(glyph->fPackedID)) {
if (!scaler->getPackedGlyphDFImage(glyph->fPackedID, glyph->width(),
glyph->height(),
storage.get())) {
return false;
}
} else {
if (!scaler->getPackedGlyphImage(glyph->fPackedID, glyph->width(),
glyph->height(),
glyph->width() * bytesPerPixel,
storage.get())) {
return false;
}
}
bool success = fBatchFontCache->addToAtlas(this, &glyph->fID, batchTarget, glyph->fMaskFormat,
glyph->width(), glyph->height(),
storage.get(), &glyph->fAtlasLocation);
if (success) {
fAtlasedGlyphs++;
}
return success;
}
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