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- // Copyright 2015 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "ui/gfx/harfbuzz_font_skia.h"
- #include <stddef.h>
- #include <stdint.h>
- #include <limits>
- #include <map>
- #include "base/check_op.h"
- #include "base/containers/lru_cache.h"
- #include "base/lazy_instance.h"
- #include "base/memory/raw_ptr.h"
- #include "base/no_destructor.h"
- #include "build/build_config.h"
- #include "third_party/skia/include/core/SkFont.h"
- #include "third_party/skia/include/core/SkTypeface.h"
- #include "ui/gfx/render_text.h"
- #include "ui/gfx/skia_util.h"
- namespace gfx {
- namespace {
- class TypefaceData;
- // Maps from code points to glyph indices in a font.
- using GlyphCache = std::map<uint32_t, uint16_t>;
- // Wraps a custom user data attached to a hb_font object. Font data provider for
- // HarfBuzz using Skia. Copied from Blink.
- // TODO(ckocagil): Eliminate the duplication. http://crbug.com/368375
- struct FontData {
- explicit FontData(GlyphCache* glyph_cache) : glyph_cache_(glyph_cache) {}
- SkFont font_;
- raw_ptr<GlyphCache> glyph_cache_;
- };
- // Deletes the object at the given pointer after casting it to the given type.
- template<typename Type>
- void DeleteByType(void* data) {
- Type* typed_data = reinterpret_cast<Type*>(data);
- delete typed_data;
- }
- template<typename Type>
- void DeleteArrayByType(void* data) {
- Type* typed_data = reinterpret_cast<Type*>(data);
- delete[] typed_data;
- }
- // Outputs the |width| and |extents| of the glyph with index |codepoint| in
- // |paint|'s font.
- void GetGlyphWidthAndExtents(const SkFont& font,
- hb_codepoint_t codepoint,
- hb_position_t* width,
- hb_glyph_extents_t* extents) {
- DCHECK_LE(codepoint, std::numeric_limits<uint16_t>::max());
- SkScalar sk_width;
- SkRect sk_bounds;
- uint16_t glyph = static_cast<uint16_t>(codepoint);
- font.getWidths(&glyph, 1, &sk_width, &sk_bounds);
- if (width)
- *width = SkiaScalarToHarfBuzzUnits(sk_width);
- if (extents) {
- // Invert y-axis because Skia is y-grows-down but we set up HarfBuzz to be
- // y-grows-up.
- extents->x_bearing = SkiaScalarToHarfBuzzUnits(sk_bounds.fLeft);
- extents->y_bearing = SkiaScalarToHarfBuzzUnits(-sk_bounds.fTop);
- extents->width = SkiaScalarToHarfBuzzUnits(sk_bounds.width());
- extents->height = SkiaScalarToHarfBuzzUnits(-sk_bounds.height());
- }
- }
- // Writes the |glyph| index for the given |unicode| code point. Returns whether
- // the glyph exists, i.e. it is not a missing glyph.
- hb_bool_t GetGlyph(hb_font_t* font,
- void* data,
- hb_codepoint_t unicode,
- hb_codepoint_t variation_selector,
- hb_codepoint_t* glyph,
- void* user_data) {
- FontData* font_data = reinterpret_cast<FontData*>(data);
- GlyphCache* cache = font_data->glyph_cache_;
- GlyphCache::iterator iter = cache->find(unicode);
- if (iter == cache->end()) {
- auto result = cache->insert(
- std::make_pair(unicode, font_data->font_.unicharToGlyph(unicode)));
- DCHECK(result.second);
- iter = result.first;
- }
- *glyph = iter->second;
- return !!*glyph;
- }
- hb_bool_t GetNominalGlyph(hb_font_t* font,
- void* data,
- hb_codepoint_t unicode,
- hb_codepoint_t* glyph,
- void* user_data) {
- return GetGlyph(font, data, unicode, 0, glyph, user_data);
- }
- // Returns the horizontal advance value of the |glyph|.
- hb_position_t GetGlyphHorizontalAdvance(hb_font_t* font,
- void* data,
- hb_codepoint_t glyph,
- void* user_data) {
- FontData* font_data = reinterpret_cast<FontData*>(data);
- hb_position_t advance = 0;
- GetGlyphWidthAndExtents(font_data->font_, glyph, &advance, 0);
- return advance;
- }
- hb_bool_t GetGlyphHorizontalOrigin(hb_font_t* font,
- void* data,
- hb_codepoint_t glyph,
- hb_position_t* x,
- hb_position_t* y,
- void* user_data) {
- // Just return true, like the HarfBuzz-FreeType implementation.
- return true;
- }
- hb_position_t GetGlyphKerning(FontData* font_data,
- hb_codepoint_t first_glyph,
- hb_codepoint_t second_glyph) {
- SkTypeface* typeface = font_data->font_.getTypeface();
- const uint16_t glyphs[2] = { static_cast<uint16_t>(first_glyph),
- static_cast<uint16_t>(second_glyph) };
- int32_t kerning_adjustments[1] = { 0 };
- if (!typeface->getKerningPairAdjustments(glyphs, 2, kerning_adjustments))
- return 0;
- SkScalar upm = SkIntToScalar(typeface->getUnitsPerEm());
- SkScalar size = font_data->font_.getSize();
- return SkiaScalarToHarfBuzzUnits(SkIntToScalar(kerning_adjustments[0]) *
- size / upm);
- }
- hb_position_t GetGlyphHorizontalKerning(hb_font_t* font,
- void* data,
- hb_codepoint_t left_glyph,
- hb_codepoint_t right_glyph,
- void* user_data) {
- FontData* font_data = reinterpret_cast<FontData*>(data);
- return GetGlyphKerning(font_data, left_glyph, right_glyph);
- }
- hb_position_t GetGlyphVerticalKerning(hb_font_t* font,
- void* data,
- hb_codepoint_t top_glyph,
- hb_codepoint_t bottom_glyph,
- void* user_data) {
- FontData* font_data = reinterpret_cast<FontData*>(data);
- return GetGlyphKerning(font_data, top_glyph, bottom_glyph);
- }
- // Writes the |extents| of |glyph|.
- hb_bool_t GetGlyphExtents(hb_font_t* font,
- void* data,
- hb_codepoint_t glyph,
- hb_glyph_extents_t* extents,
- void* user_data) {
- FontData* font_data = reinterpret_cast<FontData*>(data);
- GetGlyphWidthAndExtents(font_data->font_, glyph, 0, extents);
- return true;
- }
- class FontFuncs {
- public:
- FontFuncs() : font_funcs_(hb_font_funcs_create()) {
- hb_font_funcs_set_variation_glyph_func(font_funcs_, GetGlyph, 0, 0);
- hb_font_funcs_set_nominal_glyph_func(font_funcs_, GetNominalGlyph, 0, 0);
- hb_font_funcs_set_glyph_h_advance_func(
- font_funcs_, GetGlyphHorizontalAdvance, 0, 0);
- hb_font_funcs_set_glyph_h_kerning_func(
- font_funcs_, GetGlyphHorizontalKerning, 0, 0);
- hb_font_funcs_set_glyph_h_origin_func(
- font_funcs_, GetGlyphHorizontalOrigin, 0, 0);
- hb_font_funcs_set_glyph_v_kerning_func(
- font_funcs_, GetGlyphVerticalKerning, 0, 0);
- hb_font_funcs_set_glyph_extents_func(
- font_funcs_, GetGlyphExtents, 0, 0);
- hb_font_funcs_make_immutable(font_funcs_);
- }
- FontFuncs(const FontFuncs&) = delete;
- FontFuncs& operator=(const FontFuncs&) = delete;
- ~FontFuncs() {
- hb_font_funcs_destroy(font_funcs_);
- }
- hb_font_funcs_t* get() { return font_funcs_; }
- private:
- raw_ptr<hb_font_funcs_t> font_funcs_;
- };
- base::LazyInstance<FontFuncs>::Leaky g_font_funcs = LAZY_INSTANCE_INITIALIZER;
- // Returns the raw data of the font table |tag|.
- hb_blob_t* GetFontTable(hb_face_t* face, hb_tag_t tag, void* user_data) {
- SkTypeface* typeface = reinterpret_cast<SkTypeface*>(user_data);
- const size_t table_size = typeface->getTableSize(tag);
- if (!table_size)
- return 0;
- std::unique_ptr<char[]> buffer(new char[table_size]);
- if (!buffer)
- return 0;
- size_t actual_size = typeface->getTableData(tag, 0, table_size, buffer.get());
- if (table_size != actual_size)
- return 0;
- char* buffer_raw = buffer.release();
- return hb_blob_create(buffer_raw, static_cast<uint32_t>(table_size),
- HB_MEMORY_MODE_WRITABLE, buffer_raw,
- DeleteArrayByType<char>);
- }
- // For a given skia typeface, maps to its harfbuzz face and its glyphs cache.
- class TypefaceData {
- public:
- explicit TypefaceData(sk_sp<SkTypeface> skia_face) : sk_typeface_(skia_face) {
- face_ = hb_face_create_for_tables(GetFontTable, skia_face.get(), nullptr);
- DCHECK(face_);
- }
- TypefaceData(TypefaceData&& data) {
- face_ = data.face_;
- glyphs_ = std::move(data.glyphs_);
- data.face_ = nullptr;
- }
- TypefaceData(const TypefaceData&) = delete;
- TypefaceData& operator=(const TypefaceData&) = delete;
- ~TypefaceData() { hb_face_destroy(face_); }
- hb_face_t* face() { return face_; }
- GlyphCache* glyphs() { return &glyphs_; }
- private:
- TypefaceData() = delete;
- GlyphCache glyphs_;
- raw_ptr<hb_face_t> face_ = nullptr;
- // The skia typeface must outlive |face_| since it's being used by harfbuzz.
- sk_sp<SkTypeface> sk_typeface_;
- };
- } // namespace
- // Creates a HarfBuzz font from the given Skia face and text size.
- hb_font_t* CreateHarfBuzzFont(sk_sp<SkTypeface> skia_face,
- SkScalar text_size,
- const FontRenderParams& params,
- bool subpixel_rendering_suppressed) {
- // A cache from Skia font to harfbuzz typeface information.
- using TypefaceCache = base::LRUCache<SkFontID, TypefaceData>;
- constexpr int kTypefaceCacheSize = 64;
- static base::NoDestructor<TypefaceCache> face_caches(kTypefaceCacheSize);
- TypefaceCache* typeface_cache = face_caches.get();
- TypefaceCache::iterator typeface_data =
- typeface_cache->Get(skia_face->uniqueID());
- if (typeface_data == typeface_cache->end()) {
- TypefaceData new_typeface_data(skia_face);
- typeface_data = typeface_cache->Put(skia_face->uniqueID(),
- std::move(new_typeface_data));
- }
- DCHECK(typeface_data->second.face());
- hb_font_t* harfbuzz_font = hb_font_create(typeface_data->second.face());
- const int scale = SkiaScalarToHarfBuzzUnits(text_size);
- hb_font_set_scale(harfbuzz_font, scale, scale);
- FontData* hb_font_data = new FontData(typeface_data->second.glyphs());
- hb_font_data->font_.setTypeface(std::move(skia_face));
- hb_font_data->font_.setSize(text_size);
- // TODO(ckocagil): Do we need to update these params later?
- internal::ApplyRenderParams(params, subpixel_rendering_suppressed,
- &hb_font_data->font_);
- hb_font_set_funcs(harfbuzz_font, g_font_funcs.Get().get(), hb_font_data,
- DeleteByType<FontData>);
- hb_font_make_immutable(harfbuzz_font);
- return harfbuzz_font;
- }
- } // namespace gfx
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