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font: synthesize bold italic

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This commit is contained in:
Mitchell Hashimoto
2024-08-23 21:03:33 -07:00
parent d22551cd31
commit ce6c5517af
1 changed files with 40 additions and 22 deletions
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52
src/font/Collection.zig
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@ -260,7 +260,8 @@ pub fn completeStyles(self: *Collection, alloc: Allocator) CompleteError!void {
// If we can't create a synthetic italic face, we'll just use the regular
// face for italic.
const italic_list = self.faces.getPtr(.italic);
if (italic_list.count() == 0) italic: {
const have_italic = italic_list.count() > 0;
if (!have_italic) italic: {
const synthetic = self.syntheticItalic(regular_entry) catch |err| {
log.warn("failed to create synthetic italic, italic style will not be available err={}", .{err});
try italic_list.append(alloc, .{ .alias = regular_entry });
@ -273,7 +274,8 @@ pub fn completeStyles(self: *Collection, alloc: Allocator) CompleteError!void {
// If we don't have bold, use the regular font.
const bold_list = self.faces.getPtr(.bold);
if (bold_list.count() == 0) bold: {
const have_bold = bold_list.count() > 0;
if (!have_bold) bold: {
const synthetic = self.syntheticBold(regular_entry) catch |err| {
log.warn("failed to create synthetic bold, bold style will not be available err={}", .{err});
try bold_list.append(alloc, .{ .alias = regular_entry });
@ -284,29 +286,45 @@ pub fn completeStyles(self: *Collection, alloc: Allocator) CompleteError!void {
try bold_list.append(alloc, .{ .loaded = synthetic });
}
// If we don't have bold italic, use the regular italic font.
// If we don't have bold italic, we attempt to synthesize a bold variant
// of the italic font. If we can't do that, we'll use the italic font.
const bold_italic_list = self.faces.getPtr(.bold_italic);
if (bold_italic_list.count() == 0) {
log.warn("bold italic style not available, using italic font", .{});
if (bold_italic_list.count() == 0) bold_italic: {
// Prefer to synthesize on top of the face we already had. If we
// have bold then we try to synthesize italic on top of bold.
if (have_bold) {
if (self.syntheticItalic(bold_list.at(0))) |synthetic| {
log.info("synthetic bold italic face created from bold", .{});
try bold_italic_list.append(alloc, .{ .loaded = synthetic });
break :bold_italic;
} else |_| {}
// Nested alias isn't allowed so if the italic entry is an
// alias then we use the aliased entry.
// If synthesizing italic failed, then we try to synthesize
// boldon whatever italic font we have.
}
// Nested alias isn't allowed so we need to unwrap the italic entry.
const base_entry = base: {
const italic_entry = italic_list.at(0);
switch (italic_entry.*) {
.alias => |v| try bold_italic_list.append(
alloc,
.{ .alias = v },
),
break :base switch (italic_entry.*) {
.alias => |v| v,
.loaded,
.fallback_loaded,
.deferred,
.fallback_deferred,
=> try bold_italic_list.append(
alloc,
.{ .alias = italic_entry },
),
}
=> italic_entry,
};
};
if (self.syntheticBold(base_entry)) |synthetic| {
log.info("synthetic bold italic face created from italic", .{});
try bold_italic_list.append(alloc, .{ .loaded = synthetic });
break :bold_italic;
} else |_| {}
log.warn("bold italic style not available, using italic font", .{});
try bold_italic_list.append(alloc, .{ .alias = base_entry });
}
}