[smooth] Turn on LCD filtering during FreeType initialization.
* src/smooth/ftsmooth.c (ft_smooth_init): Enable LCD filtering. * include/freetype/ftlcdfil.h: Document it, remove patent warnings. * include/freetype/freetype.h (FT_Render_Mode): Updated. * include/freetype/config/ftoption.h, devel/ftoption.h [FT_CONFIG_OPTION_SUBPIXEL_RENDERING]: Do not mention patents.
This commit is contained in:
Alexei Podtelezhnikov
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652f886319
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11
ChangeLog
11
ChangeLog
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@ -1,3 +1,14 @@
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2020-05-12 Alexei Podtelezhnikov <apodtele@gmail.com>
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[smooth] Turn on LCD filtering during FreeType initialization.
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* src/smooth/ftsmooth.c (ft_smooth_init): Enable LCD filtering.
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* include/freetype/ftlcdfil.h: Document it, remove patent warnings.
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* include/freetype/freetype.h (FT_Render_Mode): Updated.
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* include/freetype/config/ftoption.h, devel/ftoption.h
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[FT_CONFIG_OPTION_SUBPIXEL_RENDERING]: Do not mention patents.
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2020-05-11 Alexei Podtelezhnikov <apodtele@gmail.com>
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[smooth] Stop using dedicated LCD modules and classes.
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@ -121,10 +121,8 @@ FT_BEGIN_HEADER
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* mitigate color fringes inherent to this technology, you also need to
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* explicitly set up LCD filtering.
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*
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* Note that this feature is covered by several Microsoft patents and
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* should not be activated in any default build of the library. When this
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* macro is not defined, FreeType offers alternative LCD rendering
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* technology that produces excellent output without LCD filtering.
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* When this macro is not defined, FreeType offers alternative LCD
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* rendering technology that produces excellent output.
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*/
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/* #define FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
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@ -121,10 +121,8 @@ FT_BEGIN_HEADER
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* mitigate color fringes inherent to this technology, you also need to
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* explicitly set up LCD filtering.
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*
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* Note that this feature is covered by several Microsoft patents and
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* should not be activated in any default build of the library. When this
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* macro is not defined, FreeType offers alternative LCD rendering
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* technology that produces excellent output without LCD filtering.
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* When this macro is not defined, FreeType offers alternative LCD
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* rendering technology that produces excellent output.
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*/
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/* #define FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
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@ -3246,14 +3246,6 @@ FT_BEGIN_HEADER
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* pixels and use the @FT_PIXEL_MODE_LCD_V mode.
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*
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* @note:
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* Should you define `FT_CONFIG_OPTION_SUBPIXEL_RENDERING` in your
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* `ftoption.h`, which enables patented ClearType-style rendering, the
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* LCD-optimized glyph bitmaps should be filtered to reduce color fringes
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* inherent to this technology. You can either set up LCD filtering with
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* @FT_Library_SetLcdFilter or @FT_Face_Properties, or do the filtering
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* yourself. The default FreeType LCD rendering technology does not
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* require filtering.
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*
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* The selected render mode only affects vector glyphs of a font.
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* Embedded bitmaps often have a different pixel mode like
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* @FT_PIXEL_MODE_MONO. You can use @FT_Bitmap_Convert to transform them
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@ -47,7 +47,7 @@ FT_BEGIN_HEADER
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* @description:
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* FreeType provides two alternative subpixel rendering technologies.
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* Should you define `FT_CONFIG_OPTION_SUBPIXEL_RENDERING` in your
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* `ftoption.h` file, this enables patented ClearType-style rendering.
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* `ftoption.h` file, this enables ClearType-style rendering.
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* Otherwise, Harmony LCD rendering is enabled. These technologies are
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* controlled differently and API described below, although always
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* available, performs its function when appropriate method is enabled
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@ -177,7 +177,7 @@ FT_BEGIN_HEADER
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* FT_Library_SetLcdFilter
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*
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* @description:
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* This function is used to apply color filtering to LCD decimated
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* This function is used to change filter applied to LCD decimated
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* bitmaps, like the ones used when calling @FT_Render_Glyph with
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* @FT_RENDER_MODE_LCD or @FT_RENDER_MODE_LCD_V.
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*
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@ -196,15 +196,14 @@ FT_BEGIN_HEADER
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* FreeType error code. 0~means success.
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*
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* @note:
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* This feature is always disabled by default. Clients must make an
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* explicit call to this function with a `filter` value other than
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* @FT_LCD_FILTER_NONE in order to enable it.
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* Since 2.11 the LCD filtering is enabled with @FT_LCD_FILTER_DEFAULT.
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* It is no longer necessary to call this function explicitly except
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* to choose a different filter or disable filtering altogether with
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* @FT_LCD_FILTER_NONE.
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*
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* Due to **PATENTS** covering subpixel rendering, this function doesn't
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* do anything except returning `FT_Err_Unimplemented_Feature` if the
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* configuration macro `FT_CONFIG_OPTION_SUBPIXEL_RENDERING` is not
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* defined in your build of the library, which should correspond to all
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* default builds of FreeType.
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* This function does nothing but returns `FT_Err_Unimplemented_Feature`
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* if the configuration macro `FT_CONFIG_OPTION_SUBPIXEL_RENDERING` is
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* not defined in your build of the library.
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*
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* @since:
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* 2.3.0
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@ -235,11 +234,9 @@ FT_BEGIN_HEADER
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* FreeType error code. 0~means success.
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*
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* @note:
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* Due to **PATENTS** covering subpixel rendering, this function doesn't
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* do anything except returning `FT_Err_Unimplemented_Feature` if the
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* configuration macro `FT_CONFIG_OPTION_SUBPIXEL_RENDERING` is not
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* defined in your build of the library, which should correspond to all
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* default builds of FreeType.
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* This function does nothing but returns `FT_Err_Unimplemented_Feature`
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* if the configuration macro `FT_CONFIG_OPTION_SUBPIXEL_RENDERING` is
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* not defined in your build of the library.
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*
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* LCD filter weights can also be set per face using @FT_Face_Properties
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* with @FT_PARAM_TAG_LCD_FILTER_WEIGHTS.
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@ -44,7 +44,7 @@
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sub[2].x = 21;
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sub[2].y = 0;
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#elif 0 /* or else, once ClearType patents expire */
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#else /* set up default LCD filtering */
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FT_Library_SetLcdFilter( render->root.library, FT_LCD_FILTER_DEFAULT );
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