Bug Report
What's the issue you encountered?
When using C2D_AlignCenter, characters at the edges of an individual C2D_DrawText can become clipped horizontally. In the below screenshot, it is most noticeable on the (B) buttons in the center button diamond, but it is also affecting the /L/ and (A) characters to a lesser extent. Notably, the (B) in the top row is also being aligned with C2D_AlignCenter but not showing the issue.
Each button glyph is a codepoint from the system font, (A) is \uE000 and (B) is \uE001. /L/ and \R\ are \uE07B and \uE07C, respectively. I have not made any changes to devkitPro tooling, I am using the official devkitpro/devkitarm 20240202 tag in Docker.
How can the issue be reproduced?
Building my repo at vaguerant/red-viper is probably a decent start. If you want to replicate just the problematic portion, it can be found here and in the preceding variables: https://github.com/vaguerant/red-viper/blob/5ba407fbe4ab4706d8b8ab26f6c9c2ab5cbef7a3/source/3ds/gui_hard.c#L507-L510
Environment?
- What host OS are you using?
- Linux via Docker tag of devkitpro/devkitarm
20240202
- Official release or unofficial/self-compiled build:
Additional context?
- Pure guesswork: Perhaps when centered, text is not on an exact pixel boundary and so the glyph's width is no longer representative of the necessary
C2D_Text width? e.g. A single, centered glyph with an odd number of pixels in its width would need to be placed an off-integer pixel to be truly centered. If Citro2D is centering the glyph and anti-aliasing, that would mean the width of the glyph itself is two pixels less than the aliased version which is "half" in one pixel at either side. Again, just speculating, I have no idea how Citro2D renders text or does anything at all.
- EDIT: I was able to work around this issue by adjusting the x position of the
C2D_DrawText calls by 0.5, presumably forcing them back onto a pixel boundary.
Bug Report
What's the issue you encountered?
When using
C2D_AlignCenter, characters at the edges of an individualC2D_DrawTextcan become clipped horizontally. In the below screenshot, it is most noticeable on the(B)buttons in the center button diamond, but it is also affecting the/L/and(A)characters to a lesser extent. Notably, the(B)in the top row is also being aligned withC2D_AlignCenterbut not showing the issue.Each button glyph is a codepoint from the system font,
(A)is\uE000and(B)is\uE001./L/and\R\are\uE07Band\uE07C, respectively. I have not made any changes to devkitPro tooling, I am using the official devkitpro/devkitarm20240202tag in Docker.How can the issue be reproduced?
Building my repo at vaguerant/red-viper is probably a decent start. If you want to replicate just the problematic portion, it can be found here and in the preceding variables: https://github.com/vaguerant/red-viper/blob/5ba407fbe4ab4706d8b8ab26f6c9c2ab5cbef7a3/source/3ds/gui_hard.c#L507-L510
Environment?
20240202Additional context?
C2D_Text width? e.g. A single, centered glyph with an odd number of pixels in its width would need to be placed an off-integer pixel to be truly centered. If Citro2D is centering the glyph and anti-aliasing, that would mean the width of the glyph itself is two pixels less than the aliased version which is "half" in one pixel at either side. Again, just speculating, I have no idea how Citro2D renders text or does anything at all.C2D_DrawTextcalls by 0.5, presumably forcing them back onto a pixel boundary.