shithub: freetype+ttf2subf

git/fs: mount .git/fs: mount/attach disallowed

--- a/ChangeLog

+++ b/ChangeLog

@@ -1,5 +1,20 @@

 2020-08-16  Anuj Verma  <anujv@iitbhilai.ac.in>

+	Add data types required for the forthcoming 'sdf' module.

+	* include/freetype/freetype.h (FT_Render_Mode): Add new render mode

+	`FT_RENDER_MODE_SDF`, which will be used to generate SDF.

+	* include/freetype/ftimage.h (FT_Pixel_Mode): Add new pixel mode

+	`FT_PIXEL_MODE_GRAY16`, which will be the output of the 'sdf'

+	module.

+	(FT_RASTER_FLAG_SDF): New raster flag to be used internally by the

+	'sdf' module.

+	* include/freetype/fttypes.h (FT_F6Dot10): New data type.

+2020-08-16  Anuj Verma  <anujv@iitbhilai.ac.in>

 	[base] Allow renderers of different formats.

 	* src/base/ftobjs.c (FT_Render_Glyph_Internal): Do not return if the

--- a/include/freetype/freetype.h

+++ b/include/freetype/freetype.h

@@ -3204,7 +3204,7 @@

    * @note:

    *   This function is provided as a convenience, but keep in mind that

-   *   @FT_Matrix coefficients are only 16.16 fixed point values, which can

+   *   @FT_Matrix coefficients are only 16.16 fixed-point values, which can

    *   limit the accuracy of the results.  Using floating-point computations

    *   to perform the transform directly in client code instead will always

    *   yield better numbers.

@@ -3236,11 +3236,15 @@

    *   in the @FT_GlyphSlotRec structure gives the format of the returned

    *   bitmap.

-   *   All modes except @FT_RENDER_MODE_MONO use 256 levels of opacity,

-   *   indicating pixel coverage.  Use linear alpha blending and gamma

-   *   correction to correctly render non-monochrome glyph bitmaps onto a

-   *   surface; see @FT_Render_Glyph.

+   *   All modes except @FT_RENDER_MODE_MONO and @FT_RENDER_MODE_SDF use 256

+   *   levels of opacity, indicating pixel coverage.  Use linear alpha

+   *   blending and gamma correction to correctly render non-monochrome

+   *   glyph bitmaps onto a surface; see @FT_Render_Glyph.

+   *   The @FT_RENDER_MODE_SDF is a special render mode that uses up to

+   *   65536 distance values, indicating the signed distance from the grid

+   *   position to the nearest outline.

+   *

    * @values:

    *   FT_RENDER_MODE_NORMAL ::

    *     Default render mode; it corresponds to 8-bit anti-aliased bitmaps.

@@ -3266,6 +3270,15 @@

    *     bitmaps that are 3~times the height of the original glyph outline in

    *     pixels and use the @FT_PIXEL_MODE_LCD_V mode.

+   *   FT_RENDER_MODE_SDF ::

+   *     This mode corresponds to 16-bit signed distance fields (SDF)

+   *     bitmaps.  Each 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.  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.

    *   Embedded bitmaps often have a different pixel mode like

@@ -3279,6 +3292,7 @@

     FT_RENDER_MODE_MONO,

     FT_RENDER_MODE_LCD,

     FT_RENDER_MODE_LCD_V,

+    FT_RENDER_MODE_SDF,

     FT_RENDER_MODE_MAX

--- a/include/freetype/ftimage.h

+++ b/include/freetype/ftimage.h

@@ -157,6 +157,13 @@

    *     in font files according to the OpenType specification.  We haven't

    *     found a single font using this format, however.

+   *   FT_PIXEL_MODE_GRAY16 ::

+   *     A 16-bit per pixel bitmap used to represent signed distances in a

+   *     signed distance field bitmap as needed by @FT_RENDER_MODE_SDF.

+   *     Values are represented in a 6.10 fixed-point format; this means

+   *     that you have to divide by 1024 to get the actual data generated by

+   *     the SDF rasterizers.

+   *

    *   FT_PIXEL_MODE_LCD ::

    *     An 8-bit bitmap, representing RGB or BGR decimated glyph images used

    *     for display on LCD displays; the bitmap is three times wider than

@@ -184,6 +191,7 @@

     FT_PIXEL_MODE_GRAY,

     FT_PIXEL_MODE_GRAY2,

     FT_PIXEL_MODE_GRAY4,

+    FT_PIXEL_MODE_GRAY16,

     FT_PIXEL_MODE_LCD,

     FT_PIXEL_MODE_LCD_V,

     FT_PIXEL_MODE_BGRA,

@@ -959,11 +967,17 @@

    *     will be clipped to a box specified in the `clip_box` field of the

    *     @FT_Raster_Params structure.  Otherwise, the `clip_box` is

    *     effectively set to the bounding box and all spans are generated.

+   *

+   *   FT_RASTER_FLAG_SDF ::

+   *     This flag is set to indicate that a signed distance field glyph

+   *     image should be generated.  This is only used while rendering with

+   *     the @FT_RENDER_MODE_SDF render mode.

*/

 #define FT_RASTER_FLAG_DEFAULT  0x0

 #define FT_RASTER_FLAG_AA       0x1

 #define FT_RASTER_FLAG_DIRECT   0x2

 #define FT_RASTER_FLAG_CLIP     0x4

+#define FT_RASTER_FLAG_SDF      0x8

   /* these constants are deprecated; use the corresponding */

   /* `FT_RASTER_FLAG_XXX` values instead                   */

--- a/include/freetype/fttypes.h

+++ b/include/freetype/fttypes.h

@@ -78,6 +78,7 @@

    *   FT_FWord

    *   FT_UFWord

    *   FT_F2Dot14

+   *   FT_F6Dot10

    *   FT_UnitVector

    *   FT_F26Dot6

    *   FT_Data

@@ -262,6 +263,17 @@

    *   A signed 2.14 fixed-point type used for unit vectors.

*/

   typedef signed short  FT_F2Dot14;

+  /**************************************************************************

+   *

+   * @type:

+   *   FT_F6Dot10

+   *

+   * @description:

+   *   A signed 6.10 fixed-point type used for signed distance values.

+   */

+  typedef signed short  FT_F6Dot10;

   /**************************************************************************