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font/freetype: add a 1px border to each glyph in the texture atlas

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This commit is contained in:
Mitchell Hashimoto
2023-03-16 22:54:21 -07:00
parent cb80daa1b2
commit 20f9e98894
1 changed files with 31 additions and 3 deletions
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34
src/font/face/freetype.zig
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@ -231,6 +231,11 @@ pub const Face = struct {
const tgt_w = bitmap.width;
const tgt_h = bitmap.rows;
// Must have non-empty bitmap because we return earlier
// if zero. We assume the rest of this that it is nont-zero so
// this is important.
assert(tgt_w > 0 and tgt_h > 0);
// If we resized our bitmap, we need to recalculate some metrics that
// we use such as the top/left offsets. These need to be scaled by the
// same ratio as the resize.
@ -248,10 +253,33 @@ pub const Face = struct {
break :metrics copy;
} else glyph.*;
const region = try atlas.reserve(alloc, tgt_w, tgt_h);
// Allocate our texture atlas region
const region = region: {
// We need to add a 1px padding to the font so that we don't
// get fuzzy issues when blending textures.
const padding = 1;
// If we have data, copy it into the atlas
if (region.width > 0 and region.height > 0) {
// Get the full padded region
var region = try atlas.reserve(
alloc,
tgt_w + (padding * 2), // * 2 because left+right
tgt_h + (padding * 2), // * 2 because top+bottom
);
// Modify the region so that we remove the padding so that
// we write to the non-zero location. The data in an Altlas
// is always initialized to zero (Atlas.clear) so we don't
// need to worry about zero-ing that.
region.x += padding;
region.y += padding;
region.width -= padding * 2;
region.height -= padding * 2;
break :region region;
};
// Copy the image into the region.
assert(region.width > 0 and region.height > 0);
{
const depth = atlas.format.depth();
// We can avoid a buffer copy if our atlas width and bitmap