mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 12:32:43 +00:00
ada48a1daf
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.
29 lines
865 B
C++
29 lines
865 B
C++
/*
|
|
* Copyright (c) 2023, MacDue <macdue@dueutil.tech>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <LibGfx/Font/Font.h>
|
|
|
|
namespace Gfx {
|
|
|
|
GlyphRasterPosition GlyphRasterPosition::get_nearest_fit_for(FloatPoint position)
|
|
{
|
|
constexpr auto subpixel_divisions = GlyphSubpixelOffset::subpixel_divisions();
|
|
auto fit = [](float pos, int& blit_pos, u8& subpixel_offset) {
|
|
blit_pos = floorf(pos);
|
|
subpixel_offset = round_to<u8>((pos - blit_pos) / (1.0f / subpixel_divisions));
|
|
if (subpixel_offset >= subpixel_divisions) {
|
|
blit_pos += 1;
|
|
subpixel_offset = 0;
|
|
}
|
|
};
|
|
int blit_x, blit_y;
|
|
u8 subpixel_x, subpixel_y;
|
|
fit(position.x(), blit_x, subpixel_x);
|
|
fit(position.y(), blit_y, subpixel_y);
|
|
return GlyphRasterPosition { { blit_x, blit_y }, { subpixel_x, subpixel_y } };
|
|
}
|
|
|
|
}
|