mirror of
https://github.com/lightpanda-io/browser.git
synced 2026-09-16 16:01:30 -04:00
Karl Seguin
d5807bf8a0
Follows https://github.com/lightpanda-io/browser/pull/3104. Also applies to Html and Svg. A div chain shrinks by 24 bytes.
88 lines
2.7 KiB
Zig
88 lines
2.7 KiB
Zig
// Copyright (C) 2023-2026 Lightpanda (Selecy SAS)
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//
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// Francis Bouvier <francis@lightpanda.io>
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// Pierre Tachoire <pierre@lightpanda.io>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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const std = @import("std");
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const lp = @import("lightpanda");
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const js = @import("../../../js/js.zig");
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const Node = @import("../../Node.zig");
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const Element = @import("../../Element.zig");
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const Factory = @import("../../../Factory.zig");
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const TextContent = @import("TextContent.zig");
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pub const Text = @import("Text.zig");
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pub const TSpan = @import("TSpan.zig");
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const TextPositioning = @This();
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pub const Proto = TextContent;
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_type: Type,
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_proto_canary: if (lp.IS_DEBUG) *TextContent else void = undefined,
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pub const Type = enum(u8) {
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text,
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tspan,
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};
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pub fn Subtype(comptime tag: Type) type {
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return switch (tag) {
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.text => Text,
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.tspan => TSpan,
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};
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}
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pub fn subtype(self: *const TextPositioning, comptime T: type) *T {
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const offset = comptime Factory.chainOffsetOf(T, T) - Factory.chainOffsetOf(T, TextPositioning);
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const sub: *T = @ptrFromInt(@intFromPtr(self) + offset);
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if (comptime lp.IS_DEBUG) {
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// This pointer dance only works because the factory allocates the chain
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// in a contiguous block of memory. In debug, we assert this holds via
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// the _proto_canary back pointer.
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std.debug.assert(Factory.protoOf(sub) == self);
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}
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return sub;
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}
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pub fn is(self: *TextPositioning, comptime T: type) ?*T {
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switch (self._type) {
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inline else => |tag| {
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if (Subtype(tag) == T) {
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return self.subtype(T);
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}
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},
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}
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return null;
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}
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pub fn asElement(self: *TextPositioning) *Element {
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return Factory.protoOf(self).asElement();
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}
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pub fn asNode(self: *TextPositioning) *Node {
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return self.asElement().asNode();
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}
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pub const JsApi = struct {
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pub const bridge = js.Bridge(TextPositioning);
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pub const Meta = struct {
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pub const name = "SVGTextPositioningElement";
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pub const prototype_chain = bridge.prototypeChain();
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pub var class_id: bridge.ClassId = undefined;
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};
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};
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