Font quality in Linux #2

New issue

Closed

opened 2014-08-11 03:52:53 +00:00 by spworley · 2 comments

spworley commented

2014-08-11 03:52:53 +00:00

(Migrated from github.com)

Running Ubuntu with the latest GLWF 3.0.4, fonts are very poorly rendered. The rightmost column of each glyph is clipped off, and the y baseline of each glyph is not consistent.

Running Ubuntu with the latest GLWF 3.0.4, fonts are very poorly rendered. The rightmost column of each glyph is clipped off, and the y baseline of each glyph is not consistent. ![image](https://cloud.githubusercontent.com/assets/2530715/3871955/b207275e-210a-11e4-9a35-455357837e68.png)

ocornut commented

2014-08-11 13:40:57 +00:00

(Migrated from github.com)

In this function
void ImBitmapFont::RenderText(

You can replace

            const float s1 = (0.0f + glyph->X) * tex_scale_x;
            const float t1 = (0.0f + glyph->Y) * tex_scale_y;
            const float s2 = (0.0f + glyph->X + glyph->Width) * tex_scale_x;
            const float t2 = (0.0f + glyph->Y + glyph->Height) * tex_scale_y;

With

            const float s1 = (0.5f + glyph->X) * tex_scale_x;
            const float t1 = (0.5f + glyph->Y) * tex_scale_y;
            const float s2 = (0.5f + glyph->X + glyph->Width) * tex_scale_x;
            const float t2 = (0.5f + glyph->Y + glyph->Height) * tex_scale_y;

I am currently investigating the right way to expose that because the offset depends on your rendering architecture.

In this function void ImBitmapFont::RenderText( You can replace ``` const float s1 = (0.0f + glyph->X) * tex_scale_x; const float t1 = (0.0f + glyph->Y) * tex_scale_y; const float s2 = (0.0f + glyph->X + glyph->Width) * tex_scale_x; const float t2 = (0.0f + glyph->Y + glyph->Height) * tex_scale_y; ``` With ``` const float s1 = (0.5f + glyph->X) * tex_scale_x; const float t1 = (0.5f + glyph->Y) * tex_scale_y; const float s2 = (0.5f + glyph->X + glyph->Width) * tex_scale_x; const float t2 = (0.5f + glyph->Y + glyph->Height) * tex_scale_y; ``` I am currently investigating the right way to expose that because the offset depends on your rendering architecture.

ocornut commented

2014-08-11 14:05:16 +00:00

(Migrated from github.com)

I have commited a fix, added a 'float PixelCenterOffset' value in ImGuiIO which default to 0.5f (for OpenGL and DirectX 10+). The DirectX9 sample application sets it back to 0.0. Based on a suggestion by SimDietrich.