[Git][freetype/freetype-demos][master] [ftinspect] Support gray level scaling.

[Werner Lemberg (@wl)]

Werner Lemberg pushed to branch master at FreeType / FreeType Demo Programs

Commits:

• 9f864441
  by Charlie Jiang at 2023-03-15T05:55:46+01:00

  [ftinspect] Support gray level scaling.
  
  See commit 746d5be5: Convert to 256 grays. Slightly tweaked code style.
  
  * src/ftinspect/engine/rendering.cpp (RenderingEngine::convertBitmapTo8Bpp):
  Implement it.
  

1 changed file:

• src/ftinspect/engine/rendering.cpp

Changes:

src/ftinspect/engine/rendering.cpp

---

...	...	@@ -143,6 +143,26 @@ RenderingEngine::convertBitmapTo8Bpp(FT_Bitmap* bitmap)
143	143	{
144	144	// XXX handling?
145	145	}
	146	+
	147	+ if (out.num_grays == 256)
	148	+ return out;
	149	+
	150	+ // Also scale gray values.
	151	+ auto buf = reinterpret_cast<uint32_t*>(out.buffer);
	152	+ uint32_t scale = 255U / (out.num_grays - 1);
	153	+
	154	+ // Four bytes at a time.
	155	+ unsigned i = 0;
	156	+ unsigned size = std::abs(out.pitch) * out.rows;
	157	+ for (; i <= size - 4; i += 4, buf++)
	158	+ *buf *= scale;
	159	+
	160	+ // The remaining bytes.
	161	+ for (; i < size; i++ )
	162	+ out.buffer[i] *= scale;
	163	+
	164	+ out.num_grays = 256;
	165	+
146	166	return out;
147	167	}
148	168

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