[Git][freetype/freetype-demos][master] [graph] Handle glyphs with 4 or 16 grays.

[Alexei Podtelezhnikov (@apodtele)]

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

Commits:

• 746d5be5
  by Alexei Podtelezhnikov at 2023-03-02T07:25:47-05:00

  [graph] Handle glyphs with 4 or 16 grays.
  
  * graph/gblblit.c (gblender_glyph_upgray): Convert to 256 grays.
  (gblender_blit_init): Call it if necessary.
  

1 changed file:

• graph/gblblit.c

Changes:

graph/gblblit.c

---

...	...	@@ -241,6 +241,29 @@
241	241
242	242	/* */
243	243
	244	+/* works best to convert from 4 or 16 grays to 256 grays,
	245	+ * needs aligned buffers and clean padding
	246	+ */
	247	+static void
	248	+gblender_glyph_upgray( grBitmap* glyph )
	249	+{
	250	+ int i, size = abs( glyph->pitch ) * glyph->rows;
	251	+ uint32_t* buf = (uint32_t*)glyph->buffer;
	252	+ uint32_t scale = 255U / ( glyph->grays - 1 );
	253	+
	254	+
	255	+ /* four bytes at a time */
	256	+ for ( i = 0; i <= size - 4; i += 4, buf++ )
	257	+ *buf *= scale;
	258	+
	259	+ /* remaining bytes */
	260	+ for ( ; i < size; i++ )
	261	+ glyph->buffer[i] *= scale;
	262	+
	263	+ glyph->grays = 256;
	264	+}
	265	+
	266	+
244	267	static int
245	268	gblender_blit_init( GBlenderBlit blit,
246	269	int dst_x,
...	...	@@ -269,6 +292,8 @@ gblender_blit_init( GBlenderBlit blit,
269	292	{
270	293	case gr_pixel_mode_gray:
271	294	src_format = GBLENDER_SOURCE_GRAY8;
	295	+ if ( glyph->grays != 256 )
	296	+ gblender_glyph_upgray( glyph );
272	297	if ( blender->channels )
273	298	gblender_clear( blender );
274	299	break;

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