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// Copyright (c) 2011 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 GFX_PLATFORM_FONT_GTK_
#define GFX_PLATFORM_FONT_GTK_
#pragma once
#include "base/scoped_ptr.h"
#include "gfx/platform_font.h"
#include "third_party/skia/include/core/SkRefCnt.h"
class SkTypeface;
class SkPaint;
namespace gfx {
class PlatformFontGtk : public PlatformFont {
public:
PlatformFontGtk();
explicit PlatformFontGtk(const Font& other);
explicit PlatformFontGtk(NativeFont native_font);
PlatformFontGtk(const string16& font_name,
int font_size);
// 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);
// Return the scale factor for fonts that account for DPI.
static float GetPangoScaleFactor();
// 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;
virtual int GetHeight() const;
virtual int GetBaseline() const;
virtual int GetAverageCharacterWidth() const;
virtual int GetStringWidth(const string16& text) const;
virtual int GetExpectedTextWidth(int length) const;
virtual int GetStyle() const;
virtual string16 GetFontName() const;
virtual int GetFontSize() const;
virtual NativeFont GetNativeFont() const;
private:
// Create a new instance of this object with the specified properties. Called
// from DeriveFont.
PlatformFontGtk(SkTypeface* typeface,
const string16& name,
int size,
int style);
virtual ~PlatformFontGtk();
// Initialize this object.
void InitWithNameAndSize(const string16& font_name, int font_size);
void InitWithTypefaceNameSizeAndStyle(SkTypeface* typeface,
const string16& name,
int size,
int style);
void InitFromPlatformFont(const PlatformFontGtk* 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;
// These two both point to the same SkTypeface. We use the SkAutoUnref to
// handle the reference counting, but without @typeface_ we would have to
// cast the SkRefCnt from @typeface_helper_ every time.
scoped_ptr<SkAutoUnref> typeface_helper_;
SkTypeface *typeface_;
// Additional information about the face
// Skia actually expects a family name and not a font name.
string16 font_family_;
int font_size_;
int style_;
// Cached metrics, generated at construction
int height_;
int ascent_;
// The pango metrics are much more expensive so we wait until we need them
// to compute them.
bool pango_metrics_inited_;
double average_width_;
double underline_position_;
double underline_thickness_;
// The default font, used for the default constructor.
static Font* default_font_;
};
} // namespace gfx
#endif // GFX_PLATFORM_FONT_GTK_
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