LibGfx: Add ability to request glyphs at subpixel offsets to fonts

This adds the option to pass a subpixel offset when fetching a glyph
from a font, this offset is currently snapped to thirds of a pixel
(i.e. 0, 0.33, 0.66). This is then used when rasterizing the glyph,
which is then cached like usual.

Note that when using subpixel offsets you're trading a bit of space
for accuracy. With the current third of a pixel offsets you can end
up with up to 9 bitmaps per glyph.

1 files changed, 2 insertions, 3 deletions

diff --git a/Userland/Libraries/LibGfx/Font/PathRasterizer.cpp b/Userland/Libraries/LibGfx/Font/PathRasterizer.cpp
index dbf0d4b0e0..094adff4a8 100644
--- a/Userland/Libraries/LibGfx/Font/PathRasterizer.cpp
+++ b/Userland/Libraries/LibGfx/Font/PathRasterizer.cpp
@@ -19,9 +19,8 @@ PathRasterizer::PathRasterizer(Gfx::IntSize size)
 
 void PathRasterizer::draw_path(Gfx::Path& path)
 {
-    for (auto& line : path.split_lines()) {
-        draw_line(line.from, line.to);
-    }
+    for (auto& line : path.split_lines())
+        draw_line(line.from.translated(translation()), line.to.translated(translation()));
 }
 
 RefPtr<Gfx::Bitmap> PathRasterizer::accumulate()