123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117 |
- // Copyright (c) 2012 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.
- #ifndef UI_GFX_PLATFORM_FONT_SKIA_H_
- #define UI_GFX_PLATFORM_FONT_SKIA_H_
- #include <memory>
- #include <string>
- #include "build/build_config.h"
- #include "third_party/skia/include/core/SkTypeface.h"
- #include "ui/gfx/font_render_params.h"
- #include "ui/gfx/platform_font.h"
- namespace gfx {
- class GFX_EXPORT PlatformFontSkia : public PlatformFont {
- public:
- // TODO(derat): Get rid of the default constructor in favor of using
- // FontList (which also has the concept of a default font but may contain
- // multiple font families) everywhere. See http://crbug.com/398885#c16.
- PlatformFontSkia();
- PlatformFontSkia(const std::string& font_name, int font_size_pixels);
- // Wraps the provided SkTypeface without triggering a font rematch.
- PlatformFontSkia(sk_sp<SkTypeface> typeface,
- int font_size_pixels,
- const absl::optional<FontRenderParams>& params);
- PlatformFontSkia(const PlatformFontSkia&) = delete;
- PlatformFontSkia& operator=(const PlatformFontSkia&) = delete;
- // Initializes the default PlatformFont.
- static void EnsuresDefaultFontIsInitialized();
- // Resets and reloads the cached system font used by the default constructor.
- // This function is useful when the system font has changed, for example, when
- // the locale has changed.
- static void ReloadDefaultFont();
- // Sets the default font. |font_description| is a FontList font description;
- // only the first family will be used.
- // TODO(sergeyu): Remove this function. Currently it is used only on ChromeOS
- // to set the default font to the one loaded from resources.
- //
- static void SetDefaultFontDescription(const std::string& font_description);
- // Overridden from PlatformFont:
- Font DeriveFont(int size_delta,
- int style,
- Font::Weight weight) const override;
- int GetHeight() override;
- Font::Weight GetWeight() const override;
- int GetBaseline() override;
- int GetCapHeight() override;
- int GetExpectedTextWidth(int length) override;
- int GetStyle() const override;
- const std::string& GetFontName() const override;
- std::string GetActualFontName() const override;
- int GetFontSize() const override;
- const FontRenderParams& GetFontRenderParams() override;
- sk_sp<SkTypeface> GetNativeSkTypeface() const override;
- private:
- // Create a new instance of this object with the specified properties. Called
- // from DeriveFont.
- PlatformFontSkia(sk_sp<SkTypeface> typeface,
- const std::string& family,
- int size_pixels,
- int style,
- Font::Weight weight,
- const FontRenderParams& params);
- ~PlatformFontSkia() override;
- // Initializes this object based on the passed-in details. If |typeface| is
- // empty, a new typeface will be loaded.
- void InitFromDetails(sk_sp<SkTypeface> typeface,
- const std::string& font_family,
- int font_size_pixels,
- int style,
- Font::Weight weight,
- const FontRenderParams& params);
- // Initializes this object as a copy of another PlatformFontSkia.
- void InitFromPlatformFont(const PlatformFontSkia* other);
- // Computes the metrics if they have not yet been computed.
- void ComputeMetricsIfNecessary();
- sk_sp<SkTypeface> typeface_;
- // Additional information about the face.
- // Skia actually expects a family name and not a font name.
- std::string font_family_;
- int font_size_pixels_;
- int style_;
- float device_scale_factor_;
- // Information describing how the font should be rendered.
- FontRenderParams font_render_params_;
- // Cached metrics, generated on demand.
- bool metrics_need_computation_ = true;
- int ascent_pixels_;
- int height_pixels_;
- int cap_height_pixels_;
- double average_width_pixels_;
- Font::Weight weight_;
- // A font description string of the format used by FontList.
- static std::string* default_font_description_;
- };
- } // namespace gfx
- #endif // UI_GFX_PLATFORM_FONT_SKIA_H_
|