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author | Anuj Verma <anujv@iitbhilai.ac.in> | 2020-08-23 05:35:46 +0530 |
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committer | Anuj Verma <anujv@iitbhilai.ac.in> | 2020-08-23 05:35:46 +0530 |
commit | 8cce50b9b8d770f03d32abf260a8602c220c5e02 (patch) | |
tree | dc32d5a3fcf80e4efb0a2ce19b83cfa9106bca1b | |
parent | 7c2a64b70996c2ec612d10b3be1acac580d703d9 (diff) | |
download | freetype2-8cce50b9b8d770f03d32abf260a8602c220c5e02.tar.gz |
Be more explicit about the output of the SDF rasterizers.
* include/freetype/fttypes.h (FT_F6Dot10): Add a new data type which can be\
used to convert the output buffer appropriately.
* include/freetype/freetype.h (FT_Render_Mode): Add information about the
output while using `FT_RENDER_MODE_SDF'.
* include/freetype/ftimage.h (FT_Pixel_Mode): Add more information about the
`FT_PIXEL_MODE_GRAY16' pixel mode.
-rw-r--r-- | include/freetype/freetype.h | 4 | ||||
-rw-r--r-- | include/freetype/ftimage.h | 6 | ||||
-rw-r--r-- | include/freetype/fttypes.h | 12 |
3 files changed, 19 insertions, 3 deletions
diff --git a/include/freetype/freetype.h b/include/freetype/freetype.h index aca7fcf2d..4b7da64df 100644 --- a/include/freetype/freetype.h +++ b/include/freetype/freetype.h @@ -3247,7 +3247,9 @@ FT_BEGIN_HEADER * pixel in a SDF bitmap contains information about the nearest edge of * the glyph outline. The distances are calculated from the center of * the pixel and are positive if they are filled by the outline (i.e. - * inside the outline) and negative otherwise. + * inside the outline) and negative otherwise. The output bitmap buffer + * is represented as 6.10 fixed point values, use @FT_6Dot10 and convert + * accordingly. * * @note: * The selected render mode only affects vector glyphs of a font. diff --git a/include/freetype/ftimage.h b/include/freetype/ftimage.h index 5b41ca280..b2b9f78d4 100644 --- a/include/freetype/ftimage.h +++ b/include/freetype/ftimage.h @@ -160,8 +160,10 @@ FT_BEGIN_HEADER * FT_PIXEL_MODE_GRAY16 :: * A 16-bit per pixel bitmap used to represent signed distances in a * signed distance field bitmap. This is currently only used while - * rendering using @FT_RENDER_MODE_SDF. Note that this is a 2.14 - * fixed-point fractional value. + * rendering using @FT_RENDER_MODE_SDF. One Impotant Note: + * This pixel format is represented as 6.10 fixed point format. That + * means you have to divide the values by 1024.0F in order to get + * actual data that is outputted by the SDF rasterizers. * * FT_PIXEL_MODE_LCD :: * An 8-bit bitmap, representing RGB or BGR decimated glyph images used diff --git a/include/freetype/fttypes.h b/include/freetype/fttypes.h index aaeb9e878..8200ba066 100644 --- a/include/freetype/fttypes.h +++ b/include/freetype/fttypes.h @@ -78,6 +78,7 @@ FT_BEGIN_HEADER * FT_FWord * FT_UFWord * FT_F2Dot14 + * FT_F6Dot10 * FT_UnitVector * FT_F26Dot6 * FT_Data @@ -267,6 +268,17 @@ FT_BEGIN_HEADER /************************************************************************** * * @type: + * FT_F6Dot10 + * + * @description: + * A signed 6.10 fixed-point type used for signed distance values. + */ + typedef signed short FT_F6Dot10; + + + /************************************************************************** + * + * @type: * FT_F26Dot6 * * @description: |