Re: 2.10.3 BW renderer changes

Thank you very much.

This solves my problem.

Davide Rizzo

Il 12/01/23 02:53, Alexei Podtelezhnikov ha scritto:
> Hi Davide,
>
> Thank you. I don't know how much you know about hinting vs rendering.
> You seem to be confused about FT_LOAD flags.
>
>> FT_Load_Char(face, 'e', FT_LOAD_DEFAULT | FT_LOAD_TARGET_LIGHT | FT_LOAD_MONOCHROME | FT_LOAD_NO_BITMAP);
> FT_LOAD_DEFAULT is just 0 and is meaningless in the OR-chain.
> FT_LOAD_NO_BITMAP mean no embedded bitmaps, which Arial does not have,
> if I am not mistaken
> FT_LOAD_MONOCHROME is a selector of rendering algorithm, but you
> postpone it until later. It has no effect
> FT_LOAD_TARGET_LIGHTis the only flag that does a lot here: it enables
> autohinting but only vertically, bytecode is disabled.
>
> As a result you might indeed use wrong hinting (or without horizontal
> hinting) for a mono rendering. Please try FT_LOAD_TARGET_MONO as our
> documentation clearly suggests for monochrome rendering. See
> https://freetype.org/freetype2/docs/reference/ft2-base_interface.html#ft_load_xxx.
>
>> FT_Render_Glyph(face->glyph, FT_RENDER_MODE_MONO);
> You might argue that it used to work. I really do not know how. Again,
> you should get an Ok output with just FT_LOAD_TARGET_MONO do not make
> it more complicated than that.
>
> Alexei
>
> On Wed, Jan 11, 2023 at 3:29 AM Davide Rizzo <[email protected]> wrote:
>> Hi,
>>
>> You're right.
>>
>> I wrote a very simple test program to evidence the difference in the output.
>>
>> I attach the program, the font we use (a standard arial.ttf) and the
>> different outputs I obtain at size 58.
>>
>> With freetype up to 2.10.2 I obtain the desired nice bitmap, with
>> freetype since 2.10.3 (including the last 2.12.1) I obtain a different
>> bitmap.
>>
>> My question is if it's possible with some parameter to obtain the "old"
>> bitmap with freetype 2.12.1.
>>
>> Thank you
>>
>> Davide Rizzo
>>
>>
>> Il 10/01/23 00:03, Alexei Podtelezhnikov ha scritto:
>>> Davide,
>>>
>>>> The new output is much worse, most of chars have single dots protruding
>>> in the external outline.
>>>
>>> We won't be able to help you unless you help us to reproduce or see
>>> the issue. At the very least you should name the font and the size,
>>> and give a screenshot.  Also, in our mind, only bugs in 2.12.1 are
>>> worth fixing. You should try this most recent version in case it is
>>> fixed already. There could be other software that disabled the hinting
>>> too. Therefore, we prefer that you show the issue using freetype demos
>>> like ftview or ftgrid.
>>>
>>> Does this make sense? Your report does not have any details. You can
>>> use https://gitlab.freedesktop.org/freetype/freetype/-/issues once you
>>> have mode details.
>>>
>>> Can you help us to help you?
>>>
>>> Alexei
>
>