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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 "base/strings/string16.h"
#include "ui/gfx/gfx_export.h"
#include "ui/gfx/native_widget_types.h"
namespace gfx {
class Font;
struct FontRenderParams;
class GFX_EXPORT PlatformFont : public base::RefCounted<PlatformFont> {
public:
// Creates an appropriate PlatformFont implementation.
static PlatformFont* CreateDefault();
static PlatformFont* CreateFromNativeFont(NativeFont native_font);
// 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);
// 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: BOLD, ITALIC and UNDERLINE.
virtual Font DeriveFont(int size_delta, int style) 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() const = 0;
// Returns the baseline, or ascent, of the font.
virtual int GetBaseline() const = 0;
// Returns the cap height of the font.
virtual int GetCapHeight() const = 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) const = 0;
// Returns the style of the font.
virtual int GetStyle() const = 0;
// Returns the specified font name in UTF-8.
virtual std::string GetFontName() const = 0;
// Returns the actually used font name in UTF-8.
virtual std::string GetActualFontNameForTesting() 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;
// Returns the native font handle.
virtual NativeFont GetNativeFont() const = 0;
protected:
virtual ~PlatformFont() {}
private:
friend class base::RefCounted<PlatformFont>;
};
} // namespace gfx
#endif // UI_GFX_PLATFORM_FONT_H_
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