src/gpu/GrTextStrike.cpp - skia - Git at Google

 /*
  * 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 "GrGpu.h"
 #include "GrRectanizer.h"
 #include "GrTextStrike.h"
 #include "GrTextStrike_impl.h"
 #include "SkString.h"

 #include "SkDistanceFieldGen.h"

 ///////////////////////////////////////////////////////////////////////////////

 #define GR_ATLAS_TEXTURE_WIDTH 1024
 #define GR_ATLAS_TEXTURE_HEIGHT 2048

 #define GR_PLOT_WIDTH  256
 #define GR_PLOT_HEIGHT 256

 #define GR_NUM_PLOTS_X   (GR_ATLAS_TEXTURE_WIDTH / GR_PLOT_WIDTH)
 #define GR_NUM_PLOTS_Y   (GR_ATLAS_TEXTURE_HEIGHT / GR_PLOT_HEIGHT)

 #define FONT_CACHE_STATS 0
 #if FONT_CACHE_STATS
 static int g_PurgeCount = 0;
 #endif

 GrFontCache::GrFontCache(GrGpu* gpu) : fGpu(gpu) {
     gpu->ref();
     for (int i = 0; i < kAtlasCount; ++i) {
         fAtlasMgr[i] = NULL;
     }

     fHead = fTail = NULL;
 }

 GrFontCache::~GrFontCache() {
     fCache.deleteAll();
     for (int i = 0; i < kAtlasCount; ++i) {
         delete fAtlasMgr[i];
     }
     fGpu->unref();
 #if FONT_CACHE_STATS
       GrPrintf("Num purges: %d\n", g_PurgeCount);
 #endif
 }

 static GrPixelConfig mask_format_to_pixel_config(GrMaskFormat format) {
     static const GrPixelConfig sPixelConfigs[] = {
         kAlpha_8_GrPixelConfig,
         kRGB_565_GrPixelConfig,
         kSkia8888_GrPixelConfig,
         kSkia8888_GrPixelConfig
     };
     SK_COMPILE_ASSERT(SK_ARRAY_COUNT(sPixelConfigs) == kMaskFormatCount, array_size_mismatch);

     return sPixelConfigs[format];
 }

 static int mask_format_to_atlas_index(GrMaskFormat format) {
     static const int sAtlasIndices[] = {
         GrFontCache::kA8_AtlasType,
         GrFontCache::k565_AtlasType,
         GrFontCache::k8888_AtlasType,
         GrFontCache::k8888_AtlasType
     };
     SK_COMPILE_ASSERT(SK_ARRAY_COUNT(sAtlasIndices) == kMaskFormatCount, array_size_mismatch);

     SkASSERT(sAtlasIndices[format] < GrFontCache::kAtlasCount);
     return sAtlasIndices[format];
 }

 GrTextStrike* GrFontCache::generateStrike(GrFontScaler* scaler,
                                           const Key& key) {
     GrMaskFormat format = scaler->getMaskFormat();
     GrPixelConfig config = mask_format_to_pixel_config(format);
     int atlasIndex = mask_format_to_atlas_index(format);
     if (NULL == fAtlasMgr[atlasIndex]) {
         SkISize textureSize = SkISize::Make(GR_ATLAS_TEXTURE_WIDTH,
                                             GR_ATLAS_TEXTURE_HEIGHT);
         fAtlasMgr[atlasIndex] = SkNEW_ARGS(GrAtlasMgr, (fGpu, config,
                                                         textureSize,
                                                         GR_NUM_PLOTS_X,
                                                         GR_NUM_PLOTS_Y,
                                                         true));
     }
     GrTextStrike* strike = SkNEW_ARGS(GrTextStrike,
                                       (this, scaler->getKey(), format, fAtlasMgr[atlasIndex]));
     fCache.insert(key, strike);

     if (fHead) {
         fHead->fPrev = strike;
     } else {
         SkASSERT(NULL == fTail);
         fTail = strike;
     }
     strike->fPrev = NULL;
     strike->fNext = fHead;
     fHead = strike;

     return strike;
 }

 void GrFontCache::freeAll() {
     fCache.deleteAll();
     for (int i = 0; i < kAtlasCount; ++i) {
         delete fAtlasMgr[i];
         fAtlasMgr[i] = NULL;
     }
     fHead = NULL;
     fTail = NULL;
 }

 void GrFontCache::purgeStrike(GrTextStrike* strike) {
     const GrFontCache::Key key(strike->fFontScalerKey);
     fCache.remove(key, strike);
     this->detachStrikeFromList(strike);
     delete strike;
 }

 bool GrFontCache::freeUnusedPlot(GrTextStrike* preserveStrike) {
     SkASSERT(NULL != preserveStrike);

     GrAtlasMgr* atlasMgr = preserveStrike->fAtlasMgr;
     GrPlot* plot = atlasMgr->getUnusedPlot();
     if (NULL == plot) {
         return false;
     }
     plot->resetRects();

     GrTextStrike* strike = fHead;
     GrMaskFormat maskFormat = preserveStrike->fMaskFormat;
     while (strike) {
         if (maskFormat != strike->fMaskFormat) {
             strike = strike->fNext;
             continue;
         }

         GrTextStrike* strikeToPurge = strike;
         strike = strikeToPurge->fNext;
         strikeToPurge->removePlot(plot);

         // clear out any empty strikes (except this one)
         if (strikeToPurge != preserveStrike && strikeToPurge->fAtlas.isEmpty()) {
             this->purgeStrike(strikeToPurge);
         }
     }

 #if FONT_CACHE_STATS
     ++g_PurgeCount;
 #endif

     return true;
 }

 #ifdef SK_DEBUG
 void GrFontCache::validate() const {
     int count = fCache.count();
     if (0 == count) {
         SkASSERT(!fHead);
         SkASSERT(!fTail);
     } else if (1 == count) {
         SkASSERT(fHead == fTail);
     } else {
         SkASSERT(fHead != fTail);
     }

     int count2 = 0;
     const GrTextStrike* strike = fHead;
     while (strike) {
         count2 += 1;
         strike = strike->fNext;
     }
     SkASSERT(count == count2);

     count2 = 0;
     strike = fTail;
     while (strike) {
         count2 += 1;
         strike = strike->fPrev;
     }
     SkASSERT(count == count2);
 }
 #endif

 void GrFontCache::dump() const {
     static int gDumpCount = 0;
     for (int i = 0; i < kAtlasCount; ++i) {
         if (NULL != fAtlasMgr[i]) {
             GrTexture* texture = fAtlasMgr[i]->getTexture();
             if (NULL != 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->savePixels(filename.c_str());
             }
         }
     }
     ++gDumpCount;
 }

 ///////////////////////////////////////////////////////////////////////////////

 #ifdef SK_DEBUG
     static int gCounter;
 #endif

 /*
     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.
  */

 GrTextStrike::GrTextStrike(GrFontCache* cache, const GrKey* key,
                            GrMaskFormat format,
                            GrAtlasMgr* atlasMgr) : fPool(64) {
     fFontScalerKey = key;
     fFontScalerKey->ref();

     fFontCache = cache;     // no need to ref, it won't go away before we do
     fAtlasMgr = atlasMgr;   // no need to ref, it won't go away before we do

     fMaskFormat = format;

 #ifdef SK_DEBUG
 //    GrPrintf(" GrTextStrike %p %d\n", this, gCounter);
     gCounter += 1;
 #endif
 }

 // this signature is needed because it's used with
 // SkTDArray::visitAll() (see destructor)
 static void free_glyph(GrGlyph*& glyph) { glyph->free(); }

 GrTextStrike::~GrTextStrike() {
     fFontScalerKey->unref();
     fCache.getArray().visitAll(free_glyph);

 #ifdef SK_DEBUG
     gCounter -= 1;
 //    GrPrintf("~GrTextStrike %p %d\n", this, gCounter);
 #endif
 }

 GrGlyph* GrTextStrike::generateGlyph(GrGlyph::PackedID packed,
                                      GrFontScaler* scaler) {
     SkIRect bounds;
     if (fUseDistanceField) {
         if (!scaler->getPackedGlyphDFBounds(packed, &bounds)) {
             return NULL;
         }
     } else {
         if (!scaler->getPackedGlyphBounds(packed, &bounds)) {
             return NULL;
         }
     }

     GrGlyph* glyph = fPool.alloc();
     glyph->init(packed, bounds);
     fCache.insert(packed, glyph);
     return glyph;
 }

 void GrTextStrike::removePlot(const GrPlot* plot) {
     SkTDArray<GrGlyph*>& glyphArray = fCache.getArray();
     for (int i = 0; i < glyphArray.count(); ++i) {
         if (plot == glyphArray[i]->fPlot) {
             glyphArray[i]->fPlot = NULL;
         }
     }

     fAtlasMgr->removePlot(&fAtlas, plot);
 }


 bool GrTextStrike::addGlyphToAtlas(GrGlyph* glyph, GrFontScaler* scaler) {
 #if 0   // testing hack to force us to flush our cache often
     static int gCounter;
     if ((++gCounter % 10) == 0) return false;
 #endif

     SkASSERT(glyph);
     SkASSERT(scaler);
     SkASSERT(fCache.contains(glyph));
     SkASSERT(NULL == glyph->fPlot);

     SkAutoRef ar(scaler);

     int bytesPerPixel = GrMaskFormatBytesPerPixel(fMaskFormat);

     size_t size = glyph->fBounds.area() * bytesPerPixel;
     SkAutoSMalloc<1024> storage(size);
     if (fUseDistanceField) {
         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;
         }
     }

     GrPlot* plot  = fAtlasMgr->addToAtlas(&fAtlas, glyph->width(),
                                           glyph->height(), storage.get(),
                                           &glyph->fAtlasLocation);

     if (NULL == plot) {
         return false;
     }

     glyph->fPlot = plot;
     return true;
 }
	/*
	* 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 "GrGpu.h"
	#include "GrRectanizer.h"
	#include "GrTextStrike.h"
	#include "GrTextStrike_impl.h"
	#include "SkString.h"

	#include "SkDistanceFieldGen.h"

	///////////////////////////////////////////////////////////////////////////////

	#define GR_ATLAS_TEXTURE_WIDTH 1024
	#define GR_ATLAS_TEXTURE_HEIGHT 2048

	#define GR_PLOT_WIDTH 256
	#define GR_PLOT_HEIGHT 256

	#define GR_NUM_PLOTS_X (GR_ATLAS_TEXTURE_WIDTH / GR_PLOT_WIDTH)
	#define GR_NUM_PLOTS_Y (GR_ATLAS_TEXTURE_HEIGHT / GR_PLOT_HEIGHT)

	#define FONT_CACHE_STATS 0
	#if FONT_CACHE_STATS
	static int g_PurgeCount = 0;
	#endif

	GrFontCache::GrFontCache(GrGpu* gpu) : fGpu(gpu) {
	gpu->ref();
	for (int i = 0; i < kAtlasCount; ++i) {
	fAtlasMgr[i] = NULL;
	}

	fHead = fTail = NULL;
	}

	GrFontCache::~GrFontCache() {
	fCache.deleteAll();
	for (int i = 0; i < kAtlasCount; ++i) {
	delete fAtlasMgr[i];
	}
	fGpu->unref();
	#if FONT_CACHE_STATS
	GrPrintf("Num purges: %d\n", g_PurgeCount);
	#endif
	}

	static GrPixelConfig mask_format_to_pixel_config(GrMaskFormat format) {
	static const GrPixelConfig sPixelConfigs[] = {
	kAlpha_8_GrPixelConfig,
	kRGB_565_GrPixelConfig,
	kSkia8888_GrPixelConfig,
	kSkia8888_GrPixelConfig
	};
	SK_COMPILE_ASSERT(SK_ARRAY_COUNT(sPixelConfigs) == kMaskFormatCount, array_size_mismatch);

	return sPixelConfigs[format];
	}

	static int mask_format_to_atlas_index(GrMaskFormat format) {
	static const int sAtlasIndices[] = {
	GrFontCache::kA8_AtlasType,
	GrFontCache::k565_AtlasType,
	GrFontCache::k8888_AtlasType,
	GrFontCache::k8888_AtlasType
	};
	SK_COMPILE_ASSERT(SK_ARRAY_COUNT(sAtlasIndices) == kMaskFormatCount, array_size_mismatch);

	SkASSERT(sAtlasIndices[format] < GrFontCache::kAtlasCount);
	return sAtlasIndices[format];
	}

	GrTextStrike* GrFontCache::generateStrike(GrFontScaler* scaler,
	const Key& key) {
	GrMaskFormat format = scaler->getMaskFormat();
	GrPixelConfig config = mask_format_to_pixel_config(format);
	int atlasIndex = mask_format_to_atlas_index(format);
	if (NULL == fAtlasMgr[atlasIndex]) {
	SkISize textureSize = SkISize::Make(GR_ATLAS_TEXTURE_WIDTH,
	GR_ATLAS_TEXTURE_HEIGHT);
	fAtlasMgr[atlasIndex] = SkNEW_ARGS(GrAtlasMgr, (fGpu, config,
	textureSize,
	GR_NUM_PLOTS_X,
	GR_NUM_PLOTS_Y,
	true));
	}
	GrTextStrike* strike = SkNEW_ARGS(GrTextStrike,
	(this, scaler->getKey(), format, fAtlasMgr[atlasIndex]));
	fCache.insert(key, strike);

	if (fHead) {
	fHead->fPrev = strike;
	} else {
	SkASSERT(NULL == fTail);
	fTail = strike;
	}
	strike->fPrev = NULL;
	strike->fNext = fHead;
	fHead = strike;

	return strike;
	}

	void GrFontCache::freeAll() {
	fCache.deleteAll();
	for (int i = 0; i < kAtlasCount; ++i) {
	delete fAtlasMgr[i];
	fAtlasMgr[i] = NULL;
	}
	fHead = NULL;
	fTail = NULL;
	}

	void GrFontCache::purgeStrike(GrTextStrike* strike) {
	const GrFontCache::Key key(strike->fFontScalerKey);
	fCache.remove(key, strike);
	this->detachStrikeFromList(strike);
	delete strike;
	}

	bool GrFontCache::freeUnusedPlot(GrTextStrike* preserveStrike) {
	SkASSERT(NULL != preserveStrike);

	GrAtlasMgr* atlasMgr = preserveStrike->fAtlasMgr;
	GrPlot* plot = atlasMgr->getUnusedPlot();
	if (NULL == plot) {
	return false;
	}
	plot->resetRects();

	GrTextStrike* strike = fHead;
	GrMaskFormat maskFormat = preserveStrike->fMaskFormat;
	while (strike) {
	if (maskFormat != strike->fMaskFormat) {
	strike = strike->fNext;
	continue;
	}

	GrTextStrike* strikeToPurge = strike;
	strike = strikeToPurge->fNext;
	strikeToPurge->removePlot(plot);

	// clear out any empty strikes (except this one)
	if (strikeToPurge != preserveStrike && strikeToPurge->fAtlas.isEmpty()) {
	this->purgeStrike(strikeToPurge);
	}
	}

	#if FONT_CACHE_STATS
	++g_PurgeCount;
	#endif

	return true;
	}

	#ifdef SK_DEBUG
	void GrFontCache::validate() const {
	int count = fCache.count();
	if (0 == count) {
	SkASSERT(!fHead);
	SkASSERT(!fTail);
	} else if (1 == count) {
	SkASSERT(fHead == fTail);
	} else {
	SkASSERT(fHead != fTail);
	}

	int count2 = 0;
	const GrTextStrike* strike = fHead;
	while (strike) {
	count2 += 1;
	strike = strike->fNext;
	}
	SkASSERT(count == count2);

	count2 = 0;
	strike = fTail;
	while (strike) {
	count2 += 1;
	strike = strike->fPrev;
	}
	SkASSERT(count == count2);
	}
	#endif

	void GrFontCache::dump() const {
	static int gDumpCount = 0;
	for (int i = 0; i < kAtlasCount; ++i) {
	if (NULL != fAtlasMgr[i]) {
	GrTexture* texture = fAtlasMgr[i]->getTexture();
	if (NULL != 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->savePixels(filename.c_str());
	}
	}
	}
	++gDumpCount;
	}

	///////////////////////////////////////////////////////////////////////////////

	#ifdef SK_DEBUG
	static int gCounter;
	#endif

	/*
	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.
	*/

	GrTextStrike::GrTextStrike(GrFontCache* cache, const GrKey* key,
	GrMaskFormat format,
	GrAtlasMgr* atlasMgr) : fPool(64) {
	fFontScalerKey = key;
	fFontScalerKey->ref();

	fFontCache = cache; // no need to ref, it won't go away before we do
	fAtlasMgr = atlasMgr; // no need to ref, it won't go away before we do

	fMaskFormat = format;

	#ifdef SK_DEBUG
	// GrPrintf(" GrTextStrike %p %d\n", this, gCounter);
	gCounter += 1;
	#endif
	}

	// this signature is needed because it's used with
	// SkTDArray::visitAll() (see destructor)
	static void free_glyph(GrGlyph*& glyph) { glyph->free(); }

	GrTextStrike::~GrTextStrike() {
	fFontScalerKey->unref();
	fCache.getArray().visitAll(free_glyph);

	#ifdef SK_DEBUG
	gCounter -= 1;
	// GrPrintf("~GrTextStrike %p %d\n", this, gCounter);
	#endif
	}

	GrGlyph* GrTextStrike::generateGlyph(GrGlyph::PackedID packed,
	GrFontScaler* scaler) {
	SkIRect bounds;
	if (fUseDistanceField) {
	if (!scaler->getPackedGlyphDFBounds(packed, &bounds)) {
	return NULL;
	}
	} else {
	if (!scaler->getPackedGlyphBounds(packed, &bounds)) {
	return NULL;
	}
	}

	GrGlyph* glyph = fPool.alloc();
	glyph->init(packed, bounds);
	fCache.insert(packed, glyph);
	return glyph;
	}

	void GrTextStrike::removePlot(const GrPlot* plot) {
	SkTDArray<GrGlyph*>& glyphArray = fCache.getArray();
	for (int i = 0; i < glyphArray.count(); ++i) {
	if (plot == glyphArray[i]->fPlot) {
	glyphArray[i]->fPlot = NULL;
	}
	}

	fAtlasMgr->removePlot(&fAtlas, plot);
	}


	bool GrTextStrike::addGlyphToAtlas(GrGlyph* glyph, GrFontScaler* scaler) {
	#if 0 // testing hack to force us to flush our cache often
	static int gCounter;
	if ((++gCounter % 10) == 0) return false;
	#endif

	SkASSERT(glyph);
	SkASSERT(scaler);
	SkASSERT(fCache.contains(glyph));
	SkASSERT(NULL == glyph->fPlot);

	SkAutoRef ar(scaler);

	int bytesPerPixel = GrMaskFormatBytesPerPixel(fMaskFormat);

	size_t size = glyph->fBounds.area() * bytesPerPixel;
	SkAutoSMalloc<1024> storage(size);
	if (fUseDistanceField) {
	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;
	}
	}

	GrPlot* plot = fAtlasMgr->addToAtlas(&fAtlas, glyph->width(),
	glyph->height(), storage.get(),
	&glyph->fAtlasLocation);

	if (NULL == plot) {
	return false;
	}

	glyph->fPlot = plot;
	return true;
	}