[Git][freetype/freetype-demos][master] [ftview] Report the last available index or charcode.

[Alexei Podtelezhnikov (@apodtele)]

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

Commits:

• d6cfeda4
  by Alexei Podtelezhnikov at 2021-11-16T22:37:19-05:00

  [ftview] Report the last available index or charcode.
  
  * src/ftcommon.c (get_last_char): Implement the binary search for
  the last charcode using `FT_Get_Next_Char`.
  (FTDemo_Set_Current_Font): Set the number of indices accordingly.
  * src/ftview.c (write_header): Display the last charcode or index.
  

2 changed files:

• src/ftcommon.c
• src/ftview.c

Changes:

src/ftcommon.c

---

...	...	@@ -671,11 +671,40 @@
671	671	}
672	672
673	673
	674	+ /* binary search for the last charcode */
	675	+ static int
	676	+ get_last_char( FT_Face face,
	677	+ FT_Int idx,
	678	+ FT_ULong max )
	679	+ {
	680	+ FT_ULong res, mid, min = 0;
	681	+ FT_UInt gidx;
	682	+
	683	+
	684	+ /* activate charmap */
	685	+ face->charmap = face->charmaps[idx];
	686	+
	687	+ do
	688	+ {
	689	+ mid = ( min + max ) >> 1;
	690	+ res = FT_Get_Next_Char( face, mid, &gidx );
	691	+
	692	+ if ( gidx )
	693	+ min = res;
	694	+ else
	695	+ max = mid;
	696	+ } while ( max > min );
	697	+
	698	+ return (int)max;
	699	+ }
	700	+
	701	+
674	702	void
675	703	FTDemo_Set_Current_Font( FTDemo_Handle* handle,
676	704	PFont font )
677	705	{
678	706	FT_Face face;
	707	+ int index = font->cmap_index;
679	708
680	709
681	710	handle->current_font = font;
...	...	@@ -684,8 +713,8 @@
684	713	error = FTC_Manager_LookupFace( handle->cache_manager,
685	714	handle->scaler.face_id, &face );
686	715
687		- if ( font->cmap_index < face->num_charmaps )
688		- handle->encoding = face->charmaps[font->cmap_index]->encoding;
	716	+ if ( index < face->num_charmaps )
	717	+ handle->encoding = face->charmaps[index]->encoding;
689	718	else
690	719	handle->encoding = FT_ENCODING_ORDER;
691	720
...	...	@@ -696,7 +725,7 @@
696	725	break;
697	726
698	727	case FT_ENCODING_UNICODE:
699		- font->num_indices = 0x110000L;
	728	+ font->num_indices = get_last_char( face, index, 0x110000 ) + 1;
700	729	break;
701	730
702	731	case FT_ENCODING_ADOBE_LATIN_1:
...	...	@@ -704,16 +733,16 @@
704	733	case FT_ENCODING_ADOBE_EXPERT:
705	734	case FT_ENCODING_ADOBE_CUSTOM:
706	735	case FT_ENCODING_APPLE_ROMAN:
707		- font->num_indices = 0x100L;
	736	+ font->num_indices = 0x100;
708	737	break;
709	738
710	739	/* some fonts use range 0x00-0x100, others have 0xF000-0xF0FF */
711	740	case FT_ENCODING_MS_SYMBOL:
712		- font->num_indices = 0x10000L;
	741	+ font->num_indices = get_last_char( face, index, 0x10000 ) + 1;
713	742	break;
714	743
715	744	default:
716		- font->num_indices = 0x10000L;
	745	+ font->num_indices = get_last_char( face, index, 0x10000 ) + 1;
717	746	}
718	747	}
719	748

src/ftview.c

---

...	...	@@ -1573,6 +1573,15 @@
1573	1573	}
1574	1574	}
1575	1575
	1576	+ /* Last index or charcode */
	1577	+ snprintf( buf, sizeof ( buf ),
	1578	+ handle->encoding == FT_ENCODING_ORDER ? "last: %d" :
	1579	+ handle->encoding == FT_ENCODING_UNICODE ? "last: U+%04X" :
	1580	+ "last: 0x%X",
	1581	+ handle->current_font->num_indices - 1 );
	1582	+ grWriteCellString( display->bitmap, 0, display->bitmap->rows - GR_FONT_SIZE,
	1583	+ buf, display->fore_color );
	1584	+
1576	1585	grRefreshSurface( display->surface );
1577	1586	}
1578	1587

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