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font: shaper handles special fonts

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This commit is contained in:
Mitchell Hashimoto
2022-11-24 08:59:14 -08:00
parent 9bc8d85d67
commit b9f97217ab
1 changed files with 53 additions and 7 deletions
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60
src/font/Shaper.zig
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@ -7,6 +7,7 @@ const Allocator = std.mem.Allocator;
const harfbuzz = @import("harfbuzz");
const trace = @import("tracy").trace;
const Atlas = @import("../Atlas.zig");
const font = @import("main.zig");
const Face = @import("main.zig").Face;
const DeferredFace = @import("main.zig").DeferredFace;
const Group = @import("main.zig").Group;
@ -56,14 +57,18 @@ pub fn shape(self: *Shaper, run: TextRun) ![]Cell {
const tracy = trace(@src());
defer tracy.end();
// TODO: we do not want to hardcode these
const hb_feats = &[_]harfbuzz.Feature{
harfbuzz.Feature.fromString("dlig").?,
harfbuzz.Feature.fromString("liga").?,
};
// We only do shaping if the font is not a special-case. For special-case
// fonts, the codepoint == glyph_index so we don't need to run any shaping.
if (run.font_index.special() == null) {
// TODO: we do not want to hardcode these
const hb_feats = &[_]harfbuzz.Feature{
harfbuzz.Feature.fromString("dlig").?,
harfbuzz.Feature.fromString("liga").?,
};
const face = try run.group.group.faceFromIndex(run.font_index);
harfbuzz.shape(face.hb_font, self.hb_buf, hb_feats);
const face = try run.group.group.faceFromIndex(run.font_index);
harfbuzz.shape(face.hb_font, self.hb_buf, hb_feats);
}
// If our buffer is empty, we short-circuit the rest of the work
// return nothing.
@ -569,6 +574,47 @@ test "shape Chinese characters" {
try testing.expectEqual(@as(usize, 1), count);
}
test "shape box glyphs" {
const testing = std.testing;
const alloc = testing.allocator;
var testdata = try testShaper(alloc);
defer testdata.deinit();
// Setup the box font
testdata.cache.group.box_font = font.BoxFont{
.width = 18,
.height = 36,
.thickness = 2,
};
var buf: [32]u8 = undefined;
var buf_idx: usize = 0;
buf_idx += try std.unicode.utf8Encode(0x2500, buf[buf_idx..]); // horiz line
buf_idx += try std.unicode.utf8Encode(0x2501, buf[buf_idx..]); //
// Make a screen with some data
var screen = try terminal.Screen.init(alloc, 3, 10, 0);
defer screen.deinit();
try screen.testWriteString(buf[0..buf_idx]);
// Get our run iterator
var shaper = testdata.shaper;
var it = shaper.runIterator(testdata.cache, screen.getRow(.{ .screen = 0 }));
var count: usize = 0;
while (try it.next(alloc)) |run| {
count += 1;
try testing.expectEqual(@as(u32, 2), shaper.hb_buf.getLength());
const cells = try shaper.shape(run);
try testing.expectEqual(@as(usize, 2), cells.len);
try testing.expectEqual(@as(u32, 0x2500), cells[0].glyph_index);
try testing.expectEqual(@as(u16, 0), cells[0].x);
try testing.expectEqual(@as(u32, 0x2501), cells[1].glyph_index);
try testing.expectEqual(@as(u16, 1), cells[1].x);
}
try testing.expectEqual(@as(usize, 1), count);
}
const TestShaper = struct {
alloc: Allocator,
shaper: Shaper,