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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_LINUX_H_
#define UI_GFX_PLATFORM_FONT_LINUX_H_
#include <memory>
#include <string>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "build/build_config.h"
#include "third_party/skia/include/core/SkRefCnt.h"
#include "ui/gfx/font_render_params.h"
#include "ui/gfx/platform_font.h"
class SkTypeface;
class SkPaint;
namespace gfx {
class GFX_EXPORT PlatformFontLinux : public PlatformFont {
public:
// TODO(derat): Get rid of the default constructor in favor of using
// gfx::FontList (which also has the concept of a default font but may contain
// multiple font families) everywhere. See http://crbug.com/398885#c16.
PlatformFontLinux();
PlatformFontLinux(const std::string& font_name, int font_size_pixels);
// 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();
#if defined(OS_CHROMEOS)
// Sets the default font. |font_description| is a gfx::FontList font
// description; only the first family will be used.
static void SetDefaultFontDescription(const std::string& font_description);
#endif
// Overridden from PlatformFont:
Font DeriveFont(int size_delta, int style) const override;
int GetHeight() override;
int GetBaseline() override;
int GetCapHeight() override;
int GetExpectedTextWidth(int length) override;
int GetStyle() const override;
const std::string& GetFontName() const override;
std::string GetActualFontNameForTesting() const override;
int GetFontSize() const override;
const FontRenderParams& GetFontRenderParams() override;
private:
// Create a new instance of this object with the specified properties. Called
// from DeriveFont.
PlatformFontLinux(sk_sp<SkTypeface> typeface,
const std::string& family,
int size_pixels,
int style,
const FontRenderParams& params);
~PlatformFontLinux() 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,
const FontRenderParams& params);
// Initializes this object as a copy of another PlatformFontLinux.
void InitFromPlatformFont(const PlatformFontLinux* 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_;
#if defined(OS_CHROMEOS)
// A font description string of the format used by gfx::FontList.
static std::string* default_font_description_;
#endif
DISALLOW_COPY_AND_ASSIGN(PlatformFontLinux);
};
} // namespace gfx
#endif // UI_GFX_PLATFORM_FONT_LINUX_H_