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gsk: Fix subpixel positioning

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The previous code did not subtract the fractional part from  the
origin after determining it, and it neglected the case where we
are close enough to the next integral position to just use that.
This commit is contained in:
Matthias Clasen
2024-02-17 15:57:43 -05:00
parent ad719a9c47
commit add0afae30
1 changed files with 13 additions and 6 deletions
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19
gsk/gpu/gskgpunodeprocessor.c
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@@ -3032,12 +3032,19 @@ gsk_gpu_node_processor_add_glyph_node (GskGpuNodeProcessor *self,
offset.y + (float) glyphs[i].geometry.y_offset / PANGO_SCALE);
if (glyph_align)
{
glyph_origin.x = roundf (glyph_origin.x * scale * 4);
glyph_origin.y = roundf (glyph_origin.y * scale * 4);
flags = ((int) glyph_origin.x & 3) |
(((int) glyph_origin.y & 3) << 2);
glyph_origin.x = 0.25 * inv_scale * glyph_origin.x;
glyph_origin.y = 0.25 * inv_scale * glyph_origin.y;
float x, y;
int frac_x, frac_y;
x = glyph_origin.x * scale;
y = glyph_origin.y * scale;
frac_x = (int) roundf ((x - floor (x)) * 4);
frac_y = (int) roundf ((y - floor (y)) * 4);
flags = (frac_x & 3) | ((frac_y & 3) << 2);
glyph_origin.x = (floor (x) + (frac_x == 4 ? 1.f : 0.f)) * inv_scale;
glyph_origin.y = (floor (y) + (frac_y == 4 ? 1.f : 0.f)) * inv_scale;
}
else
{