blob: 06b5cd77d5567509f93629fb293c94b60cbf7291 [file] [log] [blame]
// 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.
#include <memory>
#include <string>
#include "base/compiler_specific.h"
#include "base/macros.h"
#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 {
// 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
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 base::Optional<FontRenderParams>& params);
// Initials the default PlatformFont. Returns true if this is successful, or
// false if fonts resources are not available. If this returns false, the
// calling service should shut down.
static bool InitDefaultFont();
// 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;
// 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