third_party/WebKit/Source/platform/fonts/linux/FontRenderStyle.h

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#ifndef FontRenderStyle_h
#define FontRenderStyle_h

#include "SkPaint.h"
#include "SkTypeface.h"
#include "platform/PlatformExport.h"
#include "wtf/Allocator.h"
#include "wtf/text/CString.h"

namespace blink {

// FontRenderStyle describes the user's preferences for rendering a font at a
// given size.
struct FontRenderStyle {
  DISALLOW_NEW();
  enum {
    NoPreference = 2,
  };

  FontRenderStyle()
      : useBitmaps(0),
        useAutoHint(0),
        useHinting(0),
        hintStyle(0),
        useAntiAlias(0),
        useSubpixelRendering(0),
        useSubpixelPositioning(0) {}

  bool operator==(const FontRenderStyle& a) const {
    return useBitmaps == a.useBitmaps && useAutoHint == a.useAutoHint &&
           useHinting == a.useHinting && hintStyle == a.hintStyle &&
           useAntiAlias == a.useAntiAlias &&
           useSubpixelRendering == a.useSubpixelRendering &&
           useSubpixelPositioning == a.useSubpixelPositioning;
  }

  PLATFORM_EXPORT static void setHinting(SkPaint::Hinting);
  PLATFORM_EXPORT static void setAutoHint(bool);
  PLATFORM_EXPORT static void setUseBitmaps(bool);
  PLATFORM_EXPORT static void setAntiAlias(bool);
  PLATFORM_EXPORT static void setSubpixelRendering(bool);

  static FontRenderStyle querySystem(const CString& family,
                                     float textSize,
                                     SkTypeface::Style typefaceStyle);
  void applyToPaint(SkPaint&, float deviceScaleFactor) const;

  // Each of the use* members below can take one of three values:
  //   0: off
  //   1: on
  //   NoPreference: no preference expressed
  char useBitmaps;    // use embedded bitmap strike if possible
  char useAutoHint;   // use 'auto' hinting (FreeType specific)
  char useHinting;    // hint glyphs to the pixel grid
  char hintStyle;     // level of hinting, 0..3
  char useAntiAlias;  // antialias glyph shapes
  // use subpixel rendering (partially-filled pixels)
  char useSubpixelRendering;
  // use subpixel positioning (fractional X positions for glyphs)
  char useSubpixelPositioning;
};

}  // namespace blink

#endif  // FontRenderStyle_h