src/gpu/text/GrGlyphCache.cpp - skia - Git at Google

 /*
  * 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 "GrGlyphCache.h"
 #include "GrAtlasManager.h"
 #include "GrCaps.h"
 #include "GrColor.h"
 #include "GrDistanceFieldGenFromVector.h"

 #include "SkAutoMalloc.h"
 #include "SkDistanceFieldGen.h"

 GrGlyphCache::GrGlyphCache(const GrCaps* caps, size_t maxTextureBytes)
         : fPreserveStrike(nullptr)
         , fGlyphSizeLimit(0)
         , f565Masks(SkMasks::CreateMasks({0xF800, 0x07E0, 0x001F, 0},
                     GrMaskFormatBytesPerPixel(kA565_GrMaskFormat) * 8)) {
     fGlyphSizeLimit = ComputeGlyphSizeLimit(caps->maxTextureSize(), maxTextureBytes);
 }

 GrGlyphCache::~GrGlyphCache() {
     StrikeHash::Iter iter(&fCache);
     while (!iter.done()) {
         (*iter).fIsAbandoned = true;
         (*iter).unref();
         ++iter;
     }
 }

 void GrGlyphCache::freeAll() {
     StrikeHash::Iter iter(&fCache);
     while (!iter.done()) {
         (*iter).fIsAbandoned = true;
         (*iter).unref();
         ++iter;
     }
     fCache.rewind();
 }

 SkScalar GrGlyphCache::ComputeGlyphSizeLimit(int maxTextureSize, size_t maxTextureBytes) {
     int maxDim, minDim, maxPlot, minPlot;
     GrAtlasManager::ComputeAtlasLimits(maxTextureSize, maxTextureBytes, &maxDim, &minDim, &maxPlot,
                                        &minPlot);
     return minPlot;
 }

 void GrGlyphCache::HandleEviction(GrDrawOpAtlas::AtlasID id, void* ptr) {
     GrGlyphCache* glyphCache = reinterpret_cast<GrGlyphCache*>(ptr);

     StrikeHash::Iter iter(&glyphCache->fCache);
     for (; !iter.done(); ++iter) {
         GrTextStrike* strike = &*iter;
         strike->removeID(id);

         // clear out any empty strikes.  We will preserve the strike whose call to addToAtlas
         // triggered the eviction
         if (strike != glyphCache->fPreserveStrike && 0 == strike->fAtlasedGlyphs) {
             glyphCache->fCache.remove(GrTextStrike::GetKey(*strike));
             strike->fIsAbandoned = true;
             strike->unref();
         }
     }
 }

 static inline GrMaskFormat get_packed_glyph_mask_format(const SkGlyph& glyph) {
     SkMask::Format format = static_cast<SkMask::Format>(glyph.fMaskFormat);
     switch (format) {
         case SkMask::kBW_Format:
         case SkMask::kSDF_Format:
             // fall through to kA8 -- we store BW and SDF glyphs in our 8-bit cache
         case SkMask::kA8_Format:
             return kA8_GrMaskFormat;
         case SkMask::k3D_Format:
             return kA8_GrMaskFormat; // ignore the mul and add planes, just use the mask
         case SkMask::kLCD16_Format:
             return kA565_GrMaskFormat;
         case SkMask::kARGB32_Format:
             return kARGB_GrMaskFormat;
         default:
             SkDEBUGFAIL("unsupported SkMask::Format");
             return kA8_GrMaskFormat;
     }
 }

 static inline bool get_packed_glyph_bounds(SkGlyphCache* cache, const SkGlyph& glyph,
                                            SkIRect* bounds) {
 #if 1
     // crbug:510931
     // Retrieving the image from the cache can actually change the mask format.
     cache->findImage(glyph);
 #endif
     bounds->setXYWH(glyph.fLeft, glyph.fTop, glyph.fWidth, glyph.fHeight);

     return true;
 }

 // expands each bit in a bitmask to 0 or ~0 of type INT_TYPE. Used to expand a BW glyph mask to
 // A8, RGB565, or RGBA8888.
 template <typename INT_TYPE>
 static void expand_bits(INT_TYPE* dst,
                         const uint8_t* src,
                         int width,
                         int height,
                         int dstRowBytes,
                         int srcRowBytes) {
     for (int i = 0; i < height; ++i) {
         int rowWritesLeft = width;
         const uint8_t* s = src;
         INT_TYPE* d = dst;
         while (rowWritesLeft > 0) {
             unsigned mask = *s++;
             for (int i = 7; i >= 0 && rowWritesLeft; --i, --rowWritesLeft) {
                 *d++ = (mask & (1 << i)) ? (INT_TYPE)(~0UL) : 0;
             }
         }
         dst = reinterpret_cast<INT_TYPE*>(reinterpret_cast<intptr_t>(dst) + dstRowBytes);
         src += srcRowBytes;
     }
 }

 static bool get_packed_glyph_image(SkGlyphCache* cache, const SkGlyph& glyph, int width,
                                    int height, int dstRB, GrMaskFormat expectedMaskFormat,
                                    void* dst, const SkMasks& masks) {
     SkASSERT(glyph.fWidth == width);
     SkASSERT(glyph.fHeight == height);
     const void* src = cache->findImage(glyph);
     if (nullptr == src) {
         return false;
     }

     // Convert if the glyph uses a 565 mask format since it is using LCD text rendering but the
     // expected format is 8888 (will happen on macOS with Metal since that combination does not
     // support 565).
     if (kA565_GrMaskFormat == get_packed_glyph_mask_format(glyph) &&
         kARGB_GrMaskFormat == expectedMaskFormat) {
         const int a565Bpp = GrMaskFormatBytesPerPixel(kA565_GrMaskFormat);
         const int argbBpp = GrMaskFormatBytesPerPixel(kARGB_GrMaskFormat);
         for (int y = 0; y < height; y++) {
             for (int x = 0; x < width; x++) {
                 uint16_t color565 = 0;
                 memcpy(&color565, src, a565Bpp);
                 uint32_t colorRGBA = GrColorPackRGBA(masks.getRed(color565),
                                                      masks.getGreen(color565),
                                                      masks.getBlue(color565),
                                                      0xFF);
                 memcpy(dst, &colorRGBA, argbBpp);
                 src = (char*)src + a565Bpp;
                 dst = (char*)dst + argbBpp;
             }
         }
         return true;
     }

     // crbug:510931
     // Retrieving the image from the cache can actually change the mask format.  This case is very
     // uncommon so for now we just draw a clear box for these glyphs.
     if (get_packed_glyph_mask_format(glyph) != expectedMaskFormat) {
         const int bpp = GrMaskFormatBytesPerPixel(expectedMaskFormat);
         for (int y = 0; y < height; y++) {
             sk_bzero(dst, width * bpp);
             dst = (char*)dst + dstRB;
         }
         return true;
     }

     int srcRB = glyph.rowBytes();
     // The windows font host sometimes has BW glyphs in a non-BW strike. So it is important here to
     // check the glyph's format, not the strike's format, and to be able to convert to any of the
     // GrMaskFormats.
     if (SkMask::kBW_Format == glyph.fMaskFormat) {
         // expand bits to our mask type
         const uint8_t* bits = reinterpret_cast<const uint8_t*>(src);
         switch (expectedMaskFormat) {
             case kA8_GrMaskFormat:{
                 uint8_t* bytes = reinterpret_cast<uint8_t*>(dst);
                 expand_bits(bytes, bits, width, height, dstRB, srcRB);
                 break;
             }
             case kA565_GrMaskFormat: {
                 uint16_t* rgb565 = reinterpret_cast<uint16_t*>(dst);
                 expand_bits(rgb565, bits, width, height, dstRB, srcRB);
                 break;
             }
             default:
                 SK_ABORT("Invalid GrMaskFormat");
         }
     } else if (srcRB == dstRB) {
         memcpy(dst, src, dstRB * height);
     } else {
         const int bbp = GrMaskFormatBytesPerPixel(expectedMaskFormat);
         for (int y = 0; y < height; y++) {
             memcpy(dst, src, width * bbp);
             src = (const char*)src + srcRB;
             dst = (char*)dst + dstRB;
         }
     }
     return true;
 }

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

 /*
     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(const SkDescriptor& key)
     : fFontScalerKey(key)
     , fPool(9/*start allocations at 512 bytes*/)
     , fAtlasedGlyphs(0)
     , fIsAbandoned(false) {}

 GrTextStrike::~GrTextStrike() {
     SkTDynamicHash<GrGlyph, GrGlyph::PackedID>::Iter iter(&fCache);
     while (!iter.done()) {
         (*iter).reset();
         ++iter;
     }
 }

 GrGlyph* GrTextStrike::generateGlyph(const SkGlyph& skGlyph, GrGlyph::PackedID packed,
                                      SkGlyphCache* cache) {
     SkIRect bounds;
     if (!get_packed_glyph_bounds(cache, skGlyph, &bounds)) {
         return nullptr;
     }
     GrMaskFormat format = get_packed_glyph_mask_format(skGlyph);

     GrGlyph* glyph = fPool.make<GrGlyph>();
     glyph->init(packed, bounds, format);
     fCache.add(glyph);
     return glyph;
 }

 void GrTextStrike::removeID(GrDrawOpAtlas::AtlasID id) {
     SkTDynamicHash<GrGlyph, GrGlyph::PackedID>::Iter iter(&fCache);
     while (!iter.done()) {
         if (id == (*iter).fID) {
             (*iter).fID = GrDrawOpAtlas::kInvalidAtlasID;
             fAtlasedGlyphs--;
             SkASSERT(fAtlasedGlyphs >= 0);
         }
         ++iter;
     }
 }

 GrDrawOpAtlas::ErrorCode GrTextStrike::addGlyphToAtlas(
                                    GrResourceProvider* resourceProvider,
                                    GrDeferredUploadTarget* target,
                                    GrGlyphCache* glyphCache,
                                    GrAtlasManager* fullAtlasManager,
                                    GrGlyph* glyph,
                                    SkGlyphCache* cache,
                                    GrMaskFormat expectedMaskFormat,
                                    bool isScaledGlyph) {
     SkASSERT(glyph);
     SkASSERT(cache);
     SkASSERT(fCache.find(glyph->fPackedID));

     expectedMaskFormat = fullAtlasManager->resolveMaskFormat(expectedMaskFormat);
     int bytesPerPixel = GrMaskFormatBytesPerPixel(expectedMaskFormat);
     int width = glyph->width();
     int height = glyph->height();
     int rowBytes = width * bytesPerPixel;

     size_t size = glyph->fBounds.area() * bytesPerPixel;
     bool isSDFGlyph = GrGlyph::kDistance_MaskStyle == GrGlyph::UnpackMaskStyle(glyph->fPackedID);
     bool addPad = isScaledGlyph && !isSDFGlyph;
     if (addPad) {
         width += 2;
         rowBytes += 2*bytesPerPixel;
         size += 2 * rowBytes;
         height += 2;
         size += 2 * (height + 2) * bytesPerPixel;
     }
     SkAutoSMalloc<1024> storage(size);

     const SkGlyph& skGlyph = GrToSkGlyph(cache, glyph->fPackedID);
     void* dataPtr = storage.get();
     if (addPad) {
         sk_bzero(dataPtr, size);
         dataPtr = (char*)(dataPtr) + rowBytes + bytesPerPixel;
     }
     if (!get_packed_glyph_image(cache, skGlyph, glyph->width(), glyph->height(),
                                 rowBytes, expectedMaskFormat,
                                 dataPtr, glyphCache->getMasks())) {
         return GrDrawOpAtlas::ErrorCode::kError;
     }

     GrDrawOpAtlas::ErrorCode result = fullAtlasManager->addToAtlas(
                                                 resourceProvider, glyphCache, this,
                                                 &glyph->fID, target, expectedMaskFormat,
                                                 width, height,
                                                 storage.get(), &glyph->fAtlasLocation);
     if (GrDrawOpAtlas::ErrorCode::kSucceeded == result) {
         if (addPad) {
             glyph->fAtlasLocation.fX += 1;
             glyph->fAtlasLocation.fY += 1;
         }
         SkASSERT(GrDrawOpAtlas::kInvalidAtlasID != glyph->fID);
         fAtlasedGlyphs++;
     }
     return result;
 }
	/*
	* 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 "GrGlyphCache.h"
	#include "GrAtlasManager.h"
	#include "GrCaps.h"
	#include "GrColor.h"
	#include "GrDistanceFieldGenFromVector.h"

	#include "SkAutoMalloc.h"
	#include "SkDistanceFieldGen.h"

	GrGlyphCache::GrGlyphCache(const GrCaps* caps, size_t maxTextureBytes)
	: fPreserveStrike(nullptr)
	, fGlyphSizeLimit(0)
	, f565Masks(SkMasks::CreateMasks({0xF800, 0x07E0, 0x001F, 0},
	GrMaskFormatBytesPerPixel(kA565_GrMaskFormat) * 8)) {
	fGlyphSizeLimit = ComputeGlyphSizeLimit(caps->maxTextureSize(), maxTextureBytes);
	}

	GrGlyphCache::~GrGlyphCache() {
	StrikeHash::Iter iter(&fCache);
	while (!iter.done()) {
	(*iter).fIsAbandoned = true;
	(*iter).unref();
	++iter;
	}
	}

	void GrGlyphCache::freeAll() {
	StrikeHash::Iter iter(&fCache);
	while (!iter.done()) {
	(*iter).fIsAbandoned = true;
	(*iter).unref();
	++iter;
	}
	fCache.rewind();
	}

	SkScalar GrGlyphCache::ComputeGlyphSizeLimit(int maxTextureSize, size_t maxTextureBytes) {
	int maxDim, minDim, maxPlot, minPlot;
	GrAtlasManager::ComputeAtlasLimits(maxTextureSize, maxTextureBytes, &maxDim, &minDim, &maxPlot,
	&minPlot);
	return minPlot;
	}

	void GrGlyphCache::HandleEviction(GrDrawOpAtlas::AtlasID id, void* ptr) {
	GrGlyphCache* glyphCache = reinterpret_cast<GrGlyphCache*>(ptr);

	StrikeHash::Iter iter(&glyphCache->fCache);
	for (; !iter.done(); ++iter) {
	GrTextStrike* strike = &*iter;
	strike->removeID(id);

	// clear out any empty strikes. We will preserve the strike whose call to addToAtlas
	// triggered the eviction
	if (strike != glyphCache->fPreserveStrike && 0 == strike->fAtlasedGlyphs) {
	glyphCache->fCache.remove(GrTextStrike::GetKey(*strike));
	strike->fIsAbandoned = true;
	strike->unref();
	}
	}
	}

	static inline GrMaskFormat get_packed_glyph_mask_format(const SkGlyph& glyph) {
	SkMask::Format format = static_cast<SkMask::Format>(glyph.fMaskFormat);
	switch (format) {
	case SkMask::kBW_Format:
	case SkMask::kSDF_Format:
	// fall through to kA8 -- we store BW and SDF glyphs in our 8-bit cache
	case SkMask::kA8_Format:
	return kA8_GrMaskFormat;
	case SkMask::k3D_Format:
	return kA8_GrMaskFormat; // ignore the mul and add planes, just use the mask
	case SkMask::kLCD16_Format:
	return kA565_GrMaskFormat;
	case SkMask::kARGB32_Format:
	return kARGB_GrMaskFormat;
	default:
	SkDEBUGFAIL("unsupported SkMask::Format");
	return kA8_GrMaskFormat;
	}
	}

	static inline bool get_packed_glyph_bounds(SkGlyphCache* cache, const SkGlyph& glyph,
	SkIRect* bounds) {
	#if 1
	// crbug:510931
	// Retrieving the image from the cache can actually change the mask format.
	cache->findImage(glyph);
	#endif
	bounds->setXYWH(glyph.fLeft, glyph.fTop, glyph.fWidth, glyph.fHeight);

	return true;
	}

	// expands each bit in a bitmask to 0 or ~0 of type INT_TYPE. Used to expand a BW glyph mask to
	// A8, RGB565, or RGBA8888.
	template <typename INT_TYPE>
	static void expand_bits(INT_TYPE* dst,
	const uint8_t* src,
	int width,
	int height,
	int dstRowBytes,
	int srcRowBytes) {
	for (int i = 0; i < height; ++i) {
	int rowWritesLeft = width;
	const uint8_t* s = src;
	INT_TYPE* d = dst;
	while (rowWritesLeft > 0) {
	unsigned mask = *s++;
	for (int i = 7; i >= 0 && rowWritesLeft; --i, --rowWritesLeft) {
	*d++ = (mask & (1 << i)) ? (INT_TYPE)(~0UL) : 0;
	}
	}
	dst = reinterpret_cast<INT_TYPE*>(reinterpret_cast<intptr_t>(dst) + dstRowBytes);
	src += srcRowBytes;
	}
	}

	static bool get_packed_glyph_image(SkGlyphCache* cache, const SkGlyph& glyph, int width,
	int height, int dstRB, GrMaskFormat expectedMaskFormat,
	void* dst, const SkMasks& masks) {
	SkASSERT(glyph.fWidth == width);
	SkASSERT(glyph.fHeight == height);
	const void* src = cache->findImage(glyph);
	if (nullptr == src) {
	return false;
	}

	// Convert if the glyph uses a 565 mask format since it is using LCD text rendering but the
	// expected format is 8888 (will happen on macOS with Metal since that combination does not
	// support 565).
	if (kA565_GrMaskFormat == get_packed_glyph_mask_format(glyph) &&
	kARGB_GrMaskFormat == expectedMaskFormat) {
	const int a565Bpp = GrMaskFormatBytesPerPixel(kA565_GrMaskFormat);
	const int argbBpp = GrMaskFormatBytesPerPixel(kARGB_GrMaskFormat);
	for (int y = 0; y < height; y++) {
	for (int x = 0; x < width; x++) {
	uint16_t color565 = 0;
	memcpy(&color565, src, a565Bpp);
	uint32_t colorRGBA = GrColorPackRGBA(masks.getRed(color565),
	masks.getGreen(color565),
	masks.getBlue(color565),
	0xFF);
	memcpy(dst, &colorRGBA, argbBpp);
	src = (char*)src + a565Bpp;
	dst = (char*)dst + argbBpp;
	}
	}
	return true;
	}

	// crbug:510931
	// Retrieving the image from the cache can actually change the mask format. This case is very
	// uncommon so for now we just draw a clear box for these glyphs.
	if (get_packed_glyph_mask_format(glyph) != expectedMaskFormat) {
	const int bpp = GrMaskFormatBytesPerPixel(expectedMaskFormat);
	for (int y = 0; y < height; y++) {
	sk_bzero(dst, width * bpp);
	dst = (char*)dst + dstRB;
	}
	return true;
	}

	int srcRB = glyph.rowBytes();
	// The windows font host sometimes has BW glyphs in a non-BW strike. So it is important here to
	// check the glyph's format, not the strike's format, and to be able to convert to any of the
	// GrMaskFormats.
	if (SkMask::kBW_Format == glyph.fMaskFormat) {
	// expand bits to our mask type
	const uint8_t* bits = reinterpret_cast<const uint8_t*>(src);
	switch (expectedMaskFormat) {
	case kA8_GrMaskFormat:{
	uint8_t* bytes = reinterpret_cast<uint8_t*>(dst);
	expand_bits(bytes, bits, width, height, dstRB, srcRB);
	break;
	}
	case kA565_GrMaskFormat: {
	uint16_t* rgb565 = reinterpret_cast<uint16_t*>(dst);
	expand_bits(rgb565, bits, width, height, dstRB, srcRB);
	break;
	}
	default:
	SK_ABORT("Invalid GrMaskFormat");
	}
	} else if (srcRB == dstRB) {
	memcpy(dst, src, dstRB * height);
	} else {
	const int bbp = GrMaskFormatBytesPerPixel(expectedMaskFormat);
	for (int y = 0; y < height; y++) {
	memcpy(dst, src, width * bbp);
	src = (const char*)src + srcRB;
	dst = (char*)dst + dstRB;
	}
	}
	return true;
	}

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

	/*
	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(const SkDescriptor& key)
	: fFontScalerKey(key)
	, fPool(9/start allocations at 512 bytes/)
	, fAtlasedGlyphs(0)
	, fIsAbandoned(false) {}

	GrTextStrike::~GrTextStrike() {
	SkTDynamicHash<GrGlyph, GrGlyph::PackedID>::Iter iter(&fCache);
	while (!iter.done()) {
	(*iter).reset();
	++iter;
	}
	}

	GrGlyph* GrTextStrike::generateGlyph(const SkGlyph& skGlyph, GrGlyph::PackedID packed,
	SkGlyphCache* cache) {
	SkIRect bounds;
	if (!get_packed_glyph_bounds(cache, skGlyph, &bounds)) {
	return nullptr;
	}
	GrMaskFormat format = get_packed_glyph_mask_format(skGlyph);

	GrGlyph* glyph = fPool.make<GrGlyph>();
	glyph->init(packed, bounds, format);
	fCache.add(glyph);
	return glyph;
	}

	void GrTextStrike::removeID(GrDrawOpAtlas::AtlasID id) {
	SkTDynamicHash<GrGlyph, GrGlyph::PackedID>::Iter iter(&fCache);
	while (!iter.done()) {
	if (id == (*iter).fID) {
	(*iter).fID = GrDrawOpAtlas::kInvalidAtlasID;
	fAtlasedGlyphs--;
	SkASSERT(fAtlasedGlyphs >= 0);
	}
	++iter;
	}
	}

	GrDrawOpAtlas::ErrorCode GrTextStrike::addGlyphToAtlas(
	GrResourceProvider* resourceProvider,
	GrDeferredUploadTarget* target,
	GrGlyphCache* glyphCache,
	GrAtlasManager* fullAtlasManager,
	GrGlyph* glyph,
	SkGlyphCache* cache,
	GrMaskFormat expectedMaskFormat,
	bool isScaledGlyph) {
	SkASSERT(glyph);
	SkASSERT(cache);
	SkASSERT(fCache.find(glyph->fPackedID));

	expectedMaskFormat = fullAtlasManager->resolveMaskFormat(expectedMaskFormat);
	int bytesPerPixel = GrMaskFormatBytesPerPixel(expectedMaskFormat);
	int width = glyph->width();
	int height = glyph->height();
	int rowBytes = width * bytesPerPixel;

	size_t size = glyph->fBounds.area() * bytesPerPixel;
	bool isSDFGlyph = GrGlyph::kDistance_MaskStyle == GrGlyph::UnpackMaskStyle(glyph->fPackedID);
	bool addPad = isScaledGlyph && !isSDFGlyph;
	if (addPad) {
	width += 2;
	rowBytes += 2*bytesPerPixel;
	size += 2 * rowBytes;
	height += 2;
	size += 2 * (height + 2) * bytesPerPixel;
	}
	SkAutoSMalloc<1024> storage(size);

	const SkGlyph& skGlyph = GrToSkGlyph(cache, glyph->fPackedID);
	void* dataPtr = storage.get();
	if (addPad) {
	sk_bzero(dataPtr, size);
	dataPtr = (char*)(dataPtr) + rowBytes + bytesPerPixel;
	}
	if (!get_packed_glyph_image(cache, skGlyph, glyph->width(), glyph->height(),
	rowBytes, expectedMaskFormat,
	dataPtr, glyphCache->getMasks())) {
	return GrDrawOpAtlas::ErrorCode::kError;
	}

	GrDrawOpAtlas::ErrorCode result = fullAtlasManager->addToAtlas(
	resourceProvider, glyphCache, this,
	&glyph->fID, target, expectedMaskFormat,
	width, height,
	storage.get(), &glyph->fAtlasLocation);
	if (GrDrawOpAtlas::ErrorCode::kSucceeded == result) {
	if (addPad) {
	glyph->fAtlasLocation.fX += 1;
	glyph->fAtlasLocation.fY += 1;
	}
	SkASSERT(GrDrawOpAtlas::kInvalidAtlasID != glyph->fID);
	fAtlasedGlyphs++;
	}
	return result;
	}