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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_PANGO_H_
#define UI_GFX_PLATFORM_FONT_PANGO_H_
#include <string>
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "skia/ext/refptr.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 PlatformFontPango : public PlatformFont {
public:
PlatformFontPango();
explicit PlatformFontPango(NativeFont native_font);
PlatformFontPango(const std::string& font_name, int font_size_pixels);
// Converts |gfx_font| to a new pango font. Free the returned font with
// pango_font_description_free().
static PangoFontDescription* PangoFontFromGfxFont(const gfx::Font& gfx_font);
// 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.
static void SetDefaultFontDescription(const std::string& font_description);
#endif
// Position as an offset from the height of the drawn text, used to draw
// an underline. This is a negative number, so the underline would be
// drawn at y + height + underline_position.
double underline_position() const;
// The thickness to draw the underline.
double underline_thickness() const;
// Overridden from PlatformFont:
virtual Font DeriveFont(int size_delta, int style) const OVERRIDE;
virtual int GetHeight() const OVERRIDE;
virtual int GetBaseline() const OVERRIDE;
virtual int GetCapHeight() const OVERRIDE;
virtual int GetExpectedTextWidth(int length) const OVERRIDE;
virtual int GetStyle() const OVERRIDE;
virtual std::string GetFontName() const OVERRIDE;
virtual std::string GetActualFontNameForTesting() const OVERRIDE;
virtual int GetFontSize() const OVERRIDE;
virtual const FontRenderParams& GetFontRenderParams() const OVERRIDE;
virtual NativeFont GetNativeFont() const OVERRIDE;
private:
// Create a new instance of this object with the specified properties. Called
// from DeriveFont.
PlatformFontPango(const skia::RefPtr<SkTypeface>& typeface,
const std::string& name,
int size_pixels,
int style,
const FontRenderParams& params);
virtual ~PlatformFontPango();
// Initializes this object based on the passed-in details. If |typeface| is
// empty, a new typeface will be loaded.
void InitFromDetails(
const skia::RefPtr<SkTypeface>& typeface,
const std::string& font_family,
int font_size_pixels,
int style,
const FontRenderParams& params);
// Initializes this object as a copy of another PlatformFontPango.
void InitFromPlatformFont(const PlatformFontPango* other);
// Potentially slow call to get pango metrics (average width, underline info).
void InitPangoMetrics();
// Setup a Skia context to use the current typeface.
void PaintSetup(SkPaint* paint) const;
// Make |this| a copy of |other|.
void CopyFont(const Font& other);
// The average width of a character, initialized and cached if needed.
double GetAverageWidth() const;
skia::RefPtr<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_;
// Information describing how the font should be rendered.
FontRenderParams font_render_params_;
// Cached metrics, generated at construction.
int ascent_pixels_;
int height_pixels_;
int cap_height_pixels_;
// The pango metrics are much more expensive so we wait until we need them
// to compute them.
bool pango_metrics_inited_;
double average_width_pixels_;
double underline_position_pixels_;
double underline_thickness_pixels_;
// The default font, used for the default constructor.
static Font* default_font_;
#if defined(OS_CHROMEOS)
static std::string* default_font_description_;
#endif
DISALLOW_COPY_AND_ASSIGN(PlatformFontPango);
};
} // namespace gfx
#endif // UI_GFX_PLATFORM_FONT_PANGO_H_
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