ui/gfx/font_render_params_linux.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_GFX_FONT_RENDER_PARAMS_LINUX_H_
   6 #define UI_GFX_FONT_RENDER_PARAMS_LINUX_H_
   7
   8 #include "ui/base/ui_export.h"
   9
  10 namespace gfx {
  11
  12 // A collection of parameters describing how text should be rendered on Linux.
  13 struct UI_EXPORT FontRenderParams {
  14   // No constructor to avoid static initialization.
  15
  16   // Level of hinting to be applied.
  17   enum Hinting {
  18     HINTING_NONE = 0,
  19     HINTING_SLIGHT,
  20     HINTING_MEDIUM,
  21     HINTING_FULL,
  22   };
  23
  24   // Different subpixel orders to be used for subpixel rendering.
  25   enum SubpixelRendering {
  26     SUBPIXEL_RENDERING_NONE = 0,
  27     SUBPIXEL_RENDERING_RGB,
  28     SUBPIXEL_RENDERING_BGR,
  29     SUBPIXEL_RENDERING_VRGB,
  30     SUBPIXEL_RENDERING_VBGR,
  31   };
  32
  33   // Antialiasing (grayscale if |subpixel_rendering| is SUBPIXEL_RENDERING_NONE
  34   // and RGBA otherwise).
  35   bool antialiasing;
  36
  37   // Should subpixel positioning (i.e. fractional X positions for glyphs) be
  38   // used?
  39   bool subpixel_positioning;
  40
  41   // Should FreeType's autohinter be used (as opposed to Freetype's bytecode
  42   // interpreter, which uses fonts' own hinting instructions)?
  43   bool autohinter;
  44
  45   // Should embedded bitmaps in fonts should be used?
  46   bool use_bitmaps;
  47
  48   // Hinting level.
  49   Hinting hinting;
  50
  51   // Whether subpixel rendering should be used or not, and if so, the display's
  52   // subpixel order.
  53   SubpixelRendering subpixel_rendering;
  54 };
  55
  56 // Returns the system's default parameters for font rendering.
  57 UI_EXPORT const FontRenderParams& GetDefaultFontRenderParams();
  58
  59 // Returns the system's default parameters for WebKit font rendering.
  60 UI_EXPORT const FontRenderParams& GetDefaultWebKitFontRenderParams();
  61
  62 // Returns the system's default parameters for WebKit subpixel positioning.
  63 // Subpixel positioning is special since neither GTK nor FontConfig currently
  64 // track it as a preference.
  65 // See https://bugs.freedesktop.org/show_bug.cgi?id=50736
  66 UI_EXPORT bool GetDefaultWebkitSubpixelPositioning();
  67
  68 }  // namespace gfx
  69
  70 #endif  // UI_GFX_FONT_RENDER_PARAMS_LINUX_H_