On Fri, May 18, 2018 at 5:11 AM, Werner LEMBERG <[email protected]> wrote:
>
>>> I think that FreeType should provide a single, most basic solution
>>> for convenience – it's really just a few lines of code.
>>
>> Lets do it properly then. Let's blend a layer or a glyph (in color)
>> onto an arbitrary background image with gamma correction. I just
>> checked that finite difference approximation for gamma ramps works
>> pretty good.
>
> OK. How would an API look like?
FT_Library_SetGamma
would initialize two 256-byte look up tables in FT_LibraryRec
so that instead of power functions we could do library->gamma[red].
FT_Blend_Glyph(FT_Bitmap target,
FT_GyphSlot source,
FT_Color color
FT_Vector topleft )
target must be FT_PIXEL_MODE_BGRA
source must be FT_GLYPH_FORMAT_BITMAP
if topleft is not rounded, we can try to blend with a subpixel shift
you can start from any target but you need to blend layers sequentially.
> Note that blending onto an arbitrary background image is not necessary
> IMHO. I think the ultimate goal is to return color glyph images to
> the client that have the same format as colored bitmaps from the
> `CBDT' table.
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