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font: move auto-italicization to Group

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This commit is contained in:
Mitchell Hashimoto
2023-08-25 13:16:42 -07:00
parent 1dcf921ed9
commit ad6c2b6cc8
5 changed files with 60 additions and 91 deletions
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35
src/Surface.zig
View File

@ -230,7 +230,7 @@ pub fn init(
defer disco_it.deinit();
if (try disco_it.next()) |face| {
log.info("font regular: {s}", .{try face.name()});
try group.addFace(alloc, .regular, face);
try group.addFace(.regular, face);
} else log.warn("font-family not found: {s}", .{family});
}
if (config.@"font-family-bold") |family| {
@ -242,7 +242,7 @@ pub fn init(
defer disco_it.deinit();
if (try disco_it.next()) |face| {
log.info("font bold: {s}", .{try face.name()});
try group.addFace(alloc, .bold, face);
try group.addFace(.bold, face);
} else log.warn("font-family-bold not found: {s}", .{family});
}
if (config.@"font-family-italic") |family| {
@ -254,7 +254,7 @@ pub fn init(
defer disco_it.deinit();
if (try disco_it.next()) |face| {
log.info("font italic: {s}", .{try face.name()});
try group.addFace(alloc, .italic, face);
try group.addFace(.italic, face);
} else log.warn("font-family-italic not found: {s}", .{family});
}
if (config.@"font-family-bold-italic") |family| {
@ -267,53 +267,32 @@ pub fn init(
defer disco_it.deinit();
if (try disco_it.next()) |face| {
log.info("font bold+italic: {s}", .{try face.name()});
try group.addFace(alloc, .bold_italic, face);
try group.addFace(.bold_italic, face);
} else log.warn("font-family-bold-italic not found: {s}", .{family});
}
}
// Our built-in font will be used as a backup
try group.addFace(
alloc,
.regular,
font.DeferredFace.initLoaded(try font.Face.init(font_lib, face_ttf, font_size)),
);
try group.addFace(
alloc,
.bold,
font.DeferredFace.initLoaded(try font.Face.init(font_lib, face_bold_ttf, font_size)),
);
// If we support auto-italicization and we don't have an italic face,
// then we can try to auto-italicize our regular face.
if (comptime font.DeferredFace.canItalicize()) {
if (group.getFace(.italic) == null) {
if (group.getFace(.regular)) |regular| {
if (try regular.italicize()) |face| {
log.info("font auto-italicized: {s}", .{try face.name()});
try group.addFace(alloc, .italic, face);
}
}
}
} else {
// We don't support auto-italics. If we don't have an italic font
// face let the user know so they aren't surprised (if they look
// at logs).
if (group.getFace(.italic) == null) {
log.warn("no italic font face available, italics will not render", .{});
}
}
// Auto-italicize if we have to.
try group.italicize();
// Emoji fallback. We don't include this on Mac since Mac is expected
// to always have the Apple Emoji available.
if (builtin.os.tag != .macos or font.Discover == void) {
try group.addFace(
alloc,
.regular,
font.DeferredFace.initLoaded(try font.Face.init(font_lib, face_emoji_ttf, font_size)),
);
try group.addFace(
alloc,
.regular,
font.DeferredFace.initLoaded(try font.Face.init(font_lib, face_emoji_text_ttf, font_size)),
);
@ -329,7 +308,7 @@ pub fn init(
defer disco_it.deinit();
if (try disco_it.next()) |face| {
log.info("font emoji: {s}", .{try face.name()});
try group.addFace(alloc, .regular, face);
try group.addFace(.regular, face);
}
}
}

41
src/font/DeferredFace.zig
View File

@ -72,13 +72,6 @@ pub const CoreText = struct {
self.font.release();
self.* = undefined;
}
/// Auto-italicize the font by applying a skew.
pub fn italicize(self: *const CoreText) !CoreText {
const ct_font = try self.font.copyWithAttributes(0.0, &Face.italic_skew, null);
errdefer ct_font.release();
return .{ .font = ct_font };
}
};
/// WebCanvas specific data. This is only present when building with canvas.
@ -351,40 +344,6 @@ pub fn hasCodepoint(self: DeferredFace, cp: u32, p: ?Presentation) bool {
unreachable;
}
/// Returns true if our deferred font implementation supports auto-itacilization.
pub fn canItalicize() bool {
return @hasDecl(FaceState, "italicize") and @hasDecl(Face, "italicize");
}
/// Returns a new deferred face with the italicized version of this face
/// by applying a skew. This is NOT TRUE italics. You should use the discovery
/// mechanism to try to find an italic font. This is a fallback for when
/// that fails.
pub fn italicize(self: *const DeferredFace) !?DeferredFace {
if (comptime !canItalicize()) return null;
var result: DeferredFace = .{};
if (self.face) |face| {
result.face = try face.italicize();
}
switch (options.backend) {
.freetype => {},
.fontconfig_freetype => if (self.fc) |*fc| {
result.fc = try fc.italicize();
},
.coretext, .coretext_freetype => if (self.ct) |*ct| {
result.ct = try ct.italicize();
},
.web_canvas => if (self.wc) |*wc| {
result.wc = try wc.italicize();
},
}
return result;
}
/// The wasm-compatible API.
pub const Wasm = struct {
const wasm = @import("../os/wasm.zig");

67
src/font/Group.zig
View File

@ -98,22 +98,55 @@ pub fn deinit(self: *Group) void {
///
/// The group takes ownership of the face. The face will be deallocated when
/// the group is deallocated.
pub fn addFace(self: *Group, alloc: Allocator, style: Style, face: DeferredFace) !void {
pub fn addFace(self: *Group, style: Style, face: DeferredFace) !void {
const list = self.faces.getPtr(style);
// We have some special indexes so we must never pass those.
if (list.items.len >= FontIndex.Special.start - 1) return error.GroupFull;
try list.append(alloc, .{ .deferred = face });
try list.append(self.alloc, .{ .deferred = face });
}
/// Get the face for the given style. This will always return the first
/// face (if it exists). The returned pointer is only valid as long as
/// the faces do not change.
pub fn getFace(self: *Group, style: Style) ?*DeferredFace {
const list = self.faces.getPtr(style);
if (list.items.len == 0) return null;
return &list.items[0];
/// Returns true if we have a face for the given style, though the face may
/// not be loaded yet.
pub fn hasFaceForStyle(self: Group, style: Style) bool {
const list = self.faces.get(style);
return list.items.len > 0;
}
/// This will automatically create an italicized font from the regular
/// font face if we don't have any italicized fonts.
pub fn italicize(self: *Group) !void {
// If we have an italic font, do nothing.
const italic_list = self.faces.getPtr(.italic);
if (italic_list.items.len > 0) return;
// Not all font backends support auto-italicization.
if (comptime !@hasDecl(Face, "italicize")) {
log.warn("no italic font face available, italics will not render", .{});
return;
}
// Our regular font. If we have no regular font we also do nothing.
const regular = regular: {
const list = self.faces.get(.regular);
if (list.items.len == 0) return;
// The font must be loaded.
break :regular try self.faceFromIndex(.{
.style = .regular,
.idx = 0,
});
};
// Try to italicize it.
const face = try regular.italicize();
try italic_list.append(self.alloc, .{ .loaded = face });
var buf: [128]u8 = undefined;
if (face.name(&buf)) |name| {
log.info("font auto-italicized: {s}", .{name});
} else |_| {}
}
/// Resize the fonts to the desired size.
@ -229,7 +262,7 @@ pub fn indexForCodepoint(
cp,
face.name() catch "<error>",
});
self.addFace(self.alloc, style, face) catch break :discover;
self.addFace(style, face) catch break :discover;
if (self.indexForCodepointExact(cp, style, p)) |value| return value;
}
}
@ -377,7 +410,7 @@ pub const Wasm = struct {
}
export fn group_add_face(self: *Group, style: u16, face: *font.DeferredFace) void {
return self.addFace(alloc, @enumFromInt(style), face.*) catch |err| {
return self.addFace(@enumFromInt(style), face.*) catch |err| {
log.warn("error adding face to group err={}", .{err});
return;
};
@ -450,13 +483,13 @@ test {
var group = try init(alloc, lib, .{ .points = 12 });
defer group.deinit();
try group.addFace(alloc, .regular, DeferredFace.initLoaded(try Face.init(lib, testFont, .{ .points = 12 })));
try group.addFace(.regular, DeferredFace.initLoaded(try Face.init(lib, testFont, .{ .points = 12 })));
if (font.options.backend != .coretext) {
// Coretext doesn't support Noto's format
try group.addFace(alloc, .regular, DeferredFace.initLoaded(try Face.init(lib, testEmoji, .{ .points = 12 })));
try group.addFace(.regular, DeferredFace.initLoaded(try Face.init(lib, testEmoji, .{ .points = 12 })));
}
try group.addFace(alloc, .regular, DeferredFace.initLoaded(try Face.init(lib, testEmojiText, .{ .points = 12 })));
try group.addFace(.regular, DeferredFace.initLoaded(try Face.init(lib, testEmojiText, .{ .points = 12 })));
// Should find all visible ASCII
var i: u32 = 32;
@ -549,7 +582,7 @@ test "resize" {
var group = try init(alloc, lib, .{ .points = 12, .xdpi = 96, .ydpi = 96 });
defer group.deinit();
try group.addFace(alloc, .regular, DeferredFace.initLoaded(try Face.init(lib, testFont, .{ .points = 12, .xdpi = 96, .ydpi = 96 })));
try group.addFace(.regular, DeferredFace.initLoaded(try Face.init(lib, testFont, .{ .points = 12, .xdpi = 96, .ydpi = 96 })));
// Load a letter
{
@ -602,7 +635,7 @@ test "discover monospace with fontconfig and freetype" {
defer lib.deinit();
var group = try init(alloc, lib, .{ .points = 12 });
defer group.deinit();
try group.addFace(alloc, .regular, (try it.next()).?);
try group.addFace(.regular, (try it.next()).?);
// Should find all visible ASCII
var atlas_greyscale = try font.Atlas.init(alloc, 512, .greyscale);
@ -640,7 +673,7 @@ test "faceFromIndex returns pointer" {
var group = try init(alloc, lib, .{ .points = 12, .xdpi = 96, .ydpi = 96 });
defer group.deinit();
try group.addFace(alloc, .regular, DeferredFace.initLoaded(try Face.init(lib, testFont, .{ .points = 12, .xdpi = 96, .ydpi = 96 })));
try group.addFace(.regular, DeferredFace.initLoaded(try Face.init(lib, testFont, .{ .points = 12, .xdpi = 96, .ydpi = 96 })));
{
const idx = group.indexForCodepoint('A', .regular, null).?;

2
src/font/GroupCache.zig
View File

@ -183,7 +183,6 @@ test {
// Setup group
try cache.group.addFace(
alloc,
.regular,
DeferredFace.initLoaded(try Face.init(lib, testFont, .{ .points = 12 })),
);
@ -340,7 +339,6 @@ test "resize" {
// Setup group
try cache.group.addFace(
alloc,
.regular,
DeferredFace.initLoaded(try Face.init(lib, testFont, .{ .points = 12, .xdpi = 96, .ydpi = 96 })),
);

6
src/font/shaper/harfbuzz.zig
View File

@ -795,12 +795,12 @@ fn testShaper(alloc: Allocator) !TestShaper {
errdefer cache_ptr.*.deinit(alloc);
// Setup group
try cache_ptr.group.addFace(alloc, .regular, DeferredFace.initLoaded(try Face.init(lib, testFont, .{ .points = 12 })));
try cache_ptr.group.addFace(.regular, DeferredFace.initLoaded(try Face.init(lib, testFont, .{ .points = 12 })));
if (font.options.backend != .coretext) {
// Coretext doesn't support Noto's format
try cache_ptr.group.addFace(alloc, .regular, DeferredFace.initLoaded(try Face.init(lib, testEmoji, .{ .points = 12 })));
try cache_ptr.group.addFace(.regular, DeferredFace.initLoaded(try Face.init(lib, testEmoji, .{ .points = 12 })));
}
try cache_ptr.group.addFace(alloc, .regular, DeferredFace.initLoaded(try Face.init(lib, testEmojiText, .{ .points = 12 })));
try cache_ptr.group.addFace(.regular, DeferredFace.initLoaded(try Face.init(lib, testEmojiText, .{ .points = 12 })));
var cell_buf = try alloc.alloc(font.shape.Cell, 80);
errdefer alloc.free(cell_buf);