ref: 25b1330a4debea616a0da3c506fa090f1df9e54a
parent: 01ce1c6a9959b745c40707970c71fb971dfafa37
author: Nikolaus Waxweiler <[email protected]>
date: Sat Nov 28 13:07:53 EST 2015
Minor documentation improvements.
--- a/include/freetype/freetype.h
+++ b/include/freetype/freetype.h
@@ -3068,8 +3068,8 @@
/* and apply gamma to get them in a linear space, */
/* */
/* 2. use OVER to blend the two linear colors using the glyph pixel */
- /* as the alpha value (remember, the glyph bitmap is a coverage */
- /* bitmap), and */
+ /* as the alpha value (remember, the glyph bitmap is an alpha */
+ /* coverage bitmap), and */
/* */
/* 3. apply inverse gamma to the blended pixel and write it back to */
/* the image. */
@@ -3089,7 +3089,8 @@
/* gives equal weight to the three color primaries and does not */
/* exceed a sum of 0x100, see section @lcd_filtering. Then the */
/* only difference to gray linear blending is that subpixel-rendered */
- /* linear blending is done 3~times per pixel. */
+ /* linear blending is done 3~times per pixel: red foreground subpixel */
+ /* to red background subpixel and so on for green and blue. */
/* */
/* <InOut> */
/* slot :: A handle to the glyph slot containing the image to */
--- a/include/freetype/ftlcdfil.h
+++ b/include/freetype/ftlcdfil.h
@@ -50,7 +50,9 @@
* subpixels are color pixels, using them unfiltered creates severe
* color fringes. Use the @FT_Library_SetLcdFilter API to specify a
* low-pass filter, which is then applied to subpixel-rendered bitmaps
- * generated through @FT_Render_Glyph.
+ * generated through @FT_Render_Glyph. The filter sacrifices some of
+ * the higher resolution to reduce color fringes, making the glyph image
+ * slightly blurrier. Positional improvements will remain.
*
* Note that no filter is active by default, and that this function is
* *not* implemented in default builds of the library. You need to