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- // 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_H_
- #define UI_GFX_PLATFORM_FONT_H_
- #include <string>
- #include "base/memory/ref_counted.h"
- #include "build/build_config.h"
- #include "third_party/abseil-cpp/absl/types/optional.h"
- #include "third_party/skia/include/core/SkRefCnt.h"
- #include "third_party/skia/include/core/SkTypeface.h"
- #include "ui/gfx/font.h"
- #include "ui/gfx/font_render_params.h"
- #include "ui/gfx/gfx_export.h"
- #include "ui/gfx/native_widget_types.h"
- namespace gfx {
- class GFX_EXPORT PlatformFont : public base::RefCounted<PlatformFont> {
- public:
- // The size of the font returned by CreateDefault() on a "default" platform
- // configuration. This allows UI that wants to target a particular size of font
- // to obtain that size for the majority of users, while still compensating for a
- // user preference for a larger or smaller font.
- #if BUILDFLAG(IS_APPLE)
- static constexpr int kDefaultBaseFontSize = 13;
- #else
- static constexpr int kDefaultBaseFontSize = 12;
- #endif
- // Creates an appropriate PlatformFont implementation.
- static PlatformFont* CreateDefault();
- #if BUILDFLAG(IS_APPLE)
- static PlatformFont* CreateFromNativeFont(NativeFont native_font);
- #endif
- // Creates a PlatformFont implementation with the specified |font_name|
- // (encoded in UTF-8) and |font_size| in pixels.
- static PlatformFont* CreateFromNameAndSize(const std::string& font_name,
- int font_size);
- // Creates a PlatformFont instance from the provided SkTypeface, ideally by
- // just wrapping it without triggering a new font match. Implemented for
- // PlatformFontSkia which provides true wrapping of the provided SkTypeface.
- // The FontRenderParams can be provided or they will be determined by using
- // gfx::GetFontRenderParams(...) otherwise.
- static PlatformFont* CreateFromSkTypeface(
- sk_sp<SkTypeface> typeface,
- int font_size,
- const absl::optional<FontRenderParams>& params);
- // Returns a new Font derived from the existing font.
- // |size_delta| is the size in pixels to add to the current font.
- // The style parameter specifies the new style for the font, and is a
- // bitmask of the values: ITALIC and UNDERLINE.
- // The weight parameter specifies the desired weight of the font.
- virtual Font DeriveFont(int size_delta,
- int style,
- Font::Weight weight) const = 0;
- // Returns the number of vertical pixels needed to display characters from
- // the specified font. This may include some leading, i.e. height may be
- // greater than just ascent + descent. Specifically, the Windows and Mac
- // implementations include leading and the Linux one does not. This may
- // need to be revisited in the future.
- virtual int GetHeight() = 0;
- // Returns the font weight.
- virtual Font::Weight GetWeight() const = 0;
- // Returns the baseline, or ascent, of the font.
- virtual int GetBaseline() = 0;
- // Returns the cap height of the font.
- virtual int GetCapHeight() = 0;
- // Returns the expected number of horizontal pixels needed to display the
- // specified length of characters. Call GetStringWidth() to retrieve the
- // actual number.
- virtual int GetExpectedTextWidth(int length) = 0;
- // Returns the style of the font.
- virtual int GetStyle() const = 0;
- // Returns the specified font name in UTF-8.
- virtual const std::string& GetFontName() const = 0;
- // Returns the actually used font name in UTF-8.
- virtual std::string GetActualFontName() const = 0;
- // Returns the font size in pixels.
- virtual int GetFontSize() const = 0;
- // Returns an object describing how the font should be rendered.
- virtual const FontRenderParams& GetFontRenderParams() = 0;
- #if BUILDFLAG(IS_APPLE)
- // Returns the native font handle.
- virtual NativeFont GetNativeFont() const = 0;
- #endif
- // Returns the underlying Skia typeface. Used in RenderTextHarfBuzz for having
- // access to the exact Skia typeface returned by font fallback, as we would
- // otherwise lose the handle to the correct platform font instance.
- virtual sk_sp<SkTypeface> GetNativeSkTypeface() const = 0;
- protected:
- virtual ~PlatformFont() {}
- private:
- friend class base::RefCounted<PlatformFont>;
- };
- } // namespace gfx
- #endif // UI_GFX_PLATFORM_FONT_H_
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