ref: 6af024231b65f8a10b9d1f5f08b5774cf3edbe0a
parent: ae6d1d7b98880e90af9452d25e9cbdd4f9d97966
author: Werner Lemberg <[email protected]>
date: Tue Feb 22 05:29:30 EST 2011
[autofit] Add ASCII drawing for better explanation.
--- a/src/autofit/afhints.h
+++ b/src/autofit/afhints.h
@@ -91,6 +91,20 @@
* edges; they are specific to a script.
*
*
+ * A H
+ * | |
+ * | |
+ * | |
+ * | |
+ * C | | F
+ * +------<-----+ +-----<------+
+ * | B G |
+ * | |
+ * | |
+ * +--------------->------------------+
+ * D E
+ *
+ *
* Stems
*
* Segments need to be `linked' to other ones in order to detect stems.
@@ -99,6 +113,9 @@
* vocabulary from the TrueType specification, stem segments form a
* `black distance'.
*
+ * In the above ASCII drawing, the horizontal segments are BC, DE, and
+ * FG; the vertical segments are AB, CD, EF, and GH.
+ *
* Each segment has at most one `best' candidate to form a black
* distance, or no candidate at all. Notice that two distinct segments
* can have the same candidate, which frequently means a serif.
@@ -112,7 +129,12 @@
*
* Stems are detected by `af_{cjk,latin,...}_hint_edges'.*
+ * In the above ASCII drawing, the best candidate for both AB and CD is
+ * GH, while the best candidate for GH is AB. Similarly, the best
+ * candidate for EF and GH is AB, while the best candidate for AB is
+ * GH.
*
+ *
* Serifs
*
* On the opposite, a serif has
@@ -119,7 +141,8 @@
*
* best segment_1 = segment_2 && best segment_2 != segment_1
*
- * where segment_1 corresponds to the serif segment.
+ * where segment_1 corresponds to the serif segment (CD and EF in the
+ * above ASCII drawing).
*
* The best candidate is stored in field `serif' in structure
* `AF_Segment' (and `link' is set to NULL).