The Tor Browser: gfx/skia/trunk/src/gpu/GrTextStrike.cpp@6474c204b198 (annotated)

gfx/skia/trunk/src/gpu/GrTextStrike.cpp@6474c204b198 (annotated)

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

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /*
  * 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 "GrGpu.h"
 #include "GrRectanizer.h"
 #include "GrTextStrike.h"
 #include "GrTextStrike_impl.h"
 #include "SkString.h"
 #include "SkDistanceFieldGen.h"
 ///////////////////////////////////////////////////////////////////////////////
 #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]) {
         fAtlasMgr[atlasIndex] = SkNEW_ARGS(GrAtlasMgr, (fGpu, config));
     }
     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
 #ifdef SK_DEVELOPER
 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;
                 filename.printf("fontcache_%d%d.png", gDumpCount, i);
                 texture->savePixels(filename.c_str());
             }
         }
     }
     ++gDumpCount;
 }
 #endif
 ///////////////////////////////////////////////////////////////////////////////
 #ifdef SK_DEBUG
     static int gCounter;
 #endif
 // this acts as the max magnitude for the distance field,
 // as well as the pad we need around the glyph
 #define DISTANCE_FIELD_RANGE   4
 /*
     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 (!scaler->getPackedGlyphBounds(packed, &bounds)) {
         return NULL;
     }
     GrGlyph* glyph = fPool.alloc();
     // expand bounds to hold full distance field data
     if (fUseDistanceField) {
         bounds.fLeft   -= DISTANCE_FIELD_RANGE;
         bounds.fRight  += DISTANCE_FIELD_RANGE;
         bounds.fTop    -= DISTANCE_FIELD_RANGE;
         bounds.fBottom += DISTANCE_FIELD_RANGE;
     }
     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);
     GrPlot* plot;
     if (fUseDistanceField) {
         // we've already expanded the glyph dimensions to match the final size
         // but must shrink back down to get the packed glyph data
         int dfWidth = glyph->width();
         int dfHeight = glyph->height();
         int width = dfWidth - 2*DISTANCE_FIELD_RANGE;
         int height = dfHeight - 2*DISTANCE_FIELD_RANGE;
         int stride = width*bytesPerPixel;
         size_t size = width * height * bytesPerPixel;
         SkAutoSMalloc<1024> storage(size);
         if (!scaler->getPackedGlyphImage(glyph->fPackedID, width, height, stride, storage.get())) {
             return false;
         }
         // alloc storage for distance field glyph
         size_t dfSize = dfWidth * dfHeight * bytesPerPixel;
         SkAutoSMalloc<1024> dfStorage(dfSize);
         if (1 == bytesPerPixel) {
             (void) SkGenerateDistanceFieldFromImage((unsigned char*)dfStorage.get(),
                                                     (unsigned char*)storage.get(),
                                                     width, height, DISTANCE_FIELD_RANGE);
         } else {
             // TODO: Fix color emoji
             // for now, copy glyph into distance field storage
             // this is not correct, but it won't crash
             sk_bzero(dfStorage.get(), dfSize);
             unsigned char* ptr = (unsigned char*) storage.get();
             unsigned char* dfPtr = (unsigned char*) dfStorage.get();
             size_t dfStride = dfWidth*bytesPerPixel;
             dfPtr += DISTANCE_FIELD_RANGE*dfStride;
             dfPtr += DISTANCE_FIELD_RANGE*bytesPerPixel;
             for (int i = 0; i < height; ++i) {
                 memcpy(dfPtr, ptr, stride);
                 dfPtr += dfStride;
                 ptr += stride;
             }
         }
         // copy to atlas
         plot = fAtlasMgr->addToAtlas(&fAtlas, dfWidth, dfHeight, dfStorage.get(),
                                      &glyph->fAtlasLocation);
     } else {
         size_t size = glyph->fBounds.area() * bytesPerPixel;
         SkAutoSMalloc<1024> storage(size);
         if (!scaler->getPackedGlyphImage(glyph->fPackedID, glyph->width(),
                                          glyph->height(),
                                          glyph->width() * bytesPerPixel,
                                          storage.get())) {
             return false;
         }
         plot = fAtlasMgr->addToAtlas(&fAtlas, glyph->width(),
                                      glyph->height(), storage.get(),
                                      &glyph->fAtlasLocation);
     }
     if (NULL == plot) {
         return false;
     }
     glyph->fPlot = plot;
     return true;
 }

The Tor Browser / annotate

gfx/skia/trunk/src/gpu/GrTextStrike.cpp@6474c204b198 (annotated)

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