Re: [Inquiry] Auto-fit on monochrome output
>> No, (good) auto-hinting is not available for monochrome display. > > Does this mean even if I load the glyph with FT_LOAD_FORCE_AUTOHINT, > the autofit algorithm also will not perform any hinting? It will perform hinting but expect very ugly results. > I'm using the TrueType font, any way to improve the hinting other > than FT_LOAD_TARGET_MONO? Define 'improve hinting'. It's not clear to me what you actually want to achieve. >> A segmentation fault shouldn't happen; I guess you are forgetting >> to check a return value somewhere. If the problem persists please >> provide a small stand-alone code snippet for testing purposes that >> I can compile and run on the command line. > > bad case : Segmentation fault "potentially unexpected fatal signal 11" > -->tried with combination of > FT_LOAD_RENDER | FT_LOAD_FORCE_AUTOHINT > FT_LOAD_RENDER | FT_LOAD_TARGET_MONO | FT_LOAD_FORCE_AUTOHINT > FT_LOAD_RENDER | FT_LOAD_MONOCHROME | FT_LOAD_FORCE_AUTOHINT Thanks, but these images don't help in any way to identify a possible bug in FreeType. As I said, I need a small, compilable, stand-alone snippet (written in C) that runs on the command line and exhibits the problem. This means some work on your side to reduce your code as much as possible – you are done if removing anything from the example no longer triggers the problem. Werner
Re: FT Cache Subsystem: Custom caches
Hi Kelvin If you only interested in subpixels shifts and intend to cache 3 positions, you can achieve using LCD rendering and https://freetype.org/freetype2/docs/reference/ft2-lcd_rendering.html#ft_library_setlcdgeometry. It is apparent that LCD rendering is essentially 3 traditional antialiased bitmaps produced for shifted outlines and stacked together. Therefore, you have it already for 1/3-pixel shifts by default. Because everything is periodic, you can continue with the LCD output and clever reading frame shifts for subpixel positioning too. Theoretically, this should work. There is also https://freetype.org/freetype2/docs/reference/ft2-sizing_and_scaling.html#ft_set_transform . Perhaps you should wrap it into https://freetype.org/freetype2/docs/reference/ft2-cache_subsystem.html#ftc_face_requester. Alexei
Re: [Inquiry] Auto-fit on monochrome output
> No, (good) auto-hinting is not available for monochrome display. Does this mean even if I load the glyph with FT_LOAD_FORCE_AUTOHINT, the autofit algorithm also will not perform any hinting? I'm using the TrueType font, any way to improve the hinting other than FT_LOAD_TARGET_MONO? > A segmentation fault shouldn't happen; I guess you are forgetting to check a return value somewhere. If the problem persists please provide a small stand-alone code snippet for testing purposes that I can compile and run on the command line. bad case : Segmentation fault "potentially unexpected fatal signal 11" -->tried with combination of FT_LOAD_RENDER | FT_LOAD_FORCE_AUTOHINT FT_LOAD_RENDER | FT_LOAD_TARGET_MONO | FT_LOAD_FORCE_AUTOHINT FT_LOAD_RENDER | FT_LOAD_MONOCHROME | FT_LOAD_FORCE_AUTOHINT [image: image.png] Good case [image: image.png] Thank You. Best Regards JM Moon On Wed, 8 Nov 2023 at 00:20, Werner LEMBERG wrote: > > > I am exploring this FreeType font engine library, am wondering if the > > auto-fit(auto-hint) support for monochrome display as well? > > No, (good) auto-hinting is not available for monochrome display. > > > I get segmentation fault whenever I use this flag -> > > FT_LOAD_FORCE_AUTOHINT > > > > FT_LOAD_RENDER | FT_LOAD_MONOCHROME | FT_LOAD_FORCE_AUTOHINT > > A segmentation fault shouldn't happen; I guess you are forgetting to > check a return value somewhere. If the problem persists please > provide a small stand-alone code snippet for testing purposes that I > can compile and run on the command line. > > > Werner >
Re: [Inquiry] Auto-fit on monochrome output
> I am exploring this FreeType font engine library, am wondering if the > auto-fit(auto-hint) support for monochrome display as well? No, (good) auto-hinting is not available for monochrome display. > I get segmentation fault whenever I use this flag -> > FT_LOAD_FORCE_AUTOHINT > > FT_LOAD_RENDER | FT_LOAD_MONOCHROME | FT_LOAD_FORCE_AUTOHINT A segmentation fault shouldn't happen; I guess you are forgetting to check a return value somewhere. If the problem persists please provide a small stand-alone code snippet for testing purposes that I can compile and run on the command line. Werner
[Inquiry] Auto-fit on monochrome output
Hi, I am exploring this FreeType font engine library, am wondering if the auto-fit(auto-hint) support for monochrome display as well? I get segmentation fault whenever I use this flag -> FT_LOAD_FORCE_AUTOHINT FT_LOAD_RENDER | FT_LOAD_MONOCHROME | FT_LOAD_FORCE_AUTOHINT Thank You. Best Regards JM Moon
