[Git][freetype/freetype-demos][master] [ftlint] Examine the outline shape complexity.

[Alexei Podtelezhnikov (@apodtele)]

Alexei Podtelezhnikov pushed to branch master at FreeType / FreeType Demo Programs

Commits:

• ec7731ec
  by Alexei Podtelezhnikov at 2023-03-25T22:36:53-04:00

  [ftlint] Examine the outline shape complexity.
  
  Measured as a ratio of the outline half-perimeter to the sum of its
  control box dimensions, the shape complexity is a useful metric.
  For example, an `I` and an `M` would have complexities of about
  1.0 and 2.0, respectively.
  
  * src/ftlint.c (Examine): Implement the shape complexity calculation.
  (main) Report the shape complexity.
  * man/ftlint.1: Add a brief explanation.
  

2 changed files:

• man/ftlint.1
• src/ftlint.c

Changes:

man/ftlint.1

---

...	...	@@ -18,6 +18,8 @@ ftlint \- simple font tester
18	18	.
19	19	.B ftlint
20	20	opens the given font(s), loads and renders glyphs at the given ppem value.
	21	+The shape complexity of outline glyphs are examined based on their taxicab
	22	+perimeters: the higher the number, the more complex the shape.
21	23	For successfully rendered glyphs, it calculates the bitmap MD5 checksum
22	24	for regression testing as well as horizontal (X) and vertical (Y) acutances
23	25	for quality assessment. The acutance is equal to 2.0 for monochrome bitmap

src/ftlint.c

---

...	...	@@ -15,6 +15,7 @@
15	15
16	16	#include <ft2build.h>
17	17	#include <freetype/freetype.h>
	18	+#include <freetype/ftoutln.h>
18	19	#include <freetype/ftbitmap.h>
19	20
20	21
...	...	@@ -84,6 +85,58 @@
84	85	}
85	86
86	87
	88	+ static void
	89	+ Examine( FT_GlyphSlot slot )
	90	+ {
	91	+ unsigned long format = slot->format;
	92	+ FT_Outline* outline = &slot->outline;
	93	+ short c, p, first, last;
	94	+ FT_Vector u, v;
	95	+ FT_Pos taxi;
	96	+ FT_BBox cbox;
	97	+
	98	+
	99	+ if ( format != FT_GLYPH_FORMAT_OUTLINE )
	100	+ {
	101	+ putchar( ' ' );
	102	+ putchar( ( format >> 24 ) & 0xFF );
	103	+ putchar( ( format >> 16 ) & 0xFF );
	104	+ putchar( ( format >> 8 ) & 0xFF );
	105	+ putchar( ( format ) & 0xFF );
	106	+ putchar( ' ' );
	107	+ return;
	108	+ }
	109	+
	110	+ taxi = 0;
	111	+ last = -1;
	112	+ for ( c = 0; c < outline->n_contours; c++ )
	113	+ {
	114	+ first = last + 1;
	115	+ last = outline->contours[c];
	116	+
	117	+ u = outline->points[last];
	118	+ for ( p = first; p <= last; p++ )
	119	+ {
	120	+ v = outline->points[p];
	121	+
	122	+ taxi += v.x > u.x ? v.x - u.x : u.x - v.x;
	123	+ taxi += v.y > u.y ? v.y - u.y : u.y - v.y;
	124	+
	125	+ u = v;
	126	+ }
	127	+ }
	128	+
	129	+ if ( taxi )
	130	+ {
	131	+ FT_Outline_Get_CBox( outline, &cbox );
	132	+ printf( "%5.2f ", 0.5 * taxi /
	133	+ ( cbox.xMax - cbox.xMin + cbox.yMax - cbox.yMin ) );
	134	+ }
	135	+ else
	136	+ printf( " void " );
	137	+ }
	138	+
	139	+
87	140	/* Analyze X- and Y-acutance; bitmap should have positive pitch */
88	141	static void
89	142	Analyze( FT_Bitmap* bitmap )
...	...	@@ -281,9 +334,9 @@
281	334
282	335	if ( !quiet )
283	336	{
284		- /* "NNNNN AAAxBBBB X.XXXX Y.YYYY MMDD55MMDD55MMDD55MMDD55MMDD55MM" */
285		- printf( "\n GID imgsize Xacut Yacut MD5 hashsum" );
286		- printf( "\n-------------------------------------------------------------\n" );
	337	+ /* "NNNNN SS.SS WWWxHHHH X.XXXX Y.YYYY MMDD55MMDD55MMDD55MMDD55MMDD55MM" */
	338	+ printf( "\n GID shape imgsize Xacut Yacut MD5 hashsum" );
	339	+ printf( "\n-------------------------------------------------------------------\n" );
287	340	}
288	341
289	342	Fail = 0;
...	...	@@ -309,6 +362,8 @@
309	362
310	363	printf( "%5u ", id );
311	364
	365	+ Examine( face->glyph );
	366	+
312	367	error = FT_Render_Glyph( face->glyph, render_mode );
313	368	if ( error && error != FT_Err_Cannot_Render_Glyph )
314	369	{

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