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initial dummy canvas

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This commit is contained in:
Halil Durak
2025-11-05 11:50:57 +03:00
parent 47ceabc43f
commit 4cf61d101c
5 changed files with 75 additions and 0 deletions
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35
src/browser/canvas/CanvasRenderingContext2D.zig Normal file
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@@ -0,0 +1,35 @@
// Copyright (C) 2023-2025 Lightpanda (Selecy SAS)
//
// Francis Bouvier <francis@lightpanda.io>
// Pierre Tachoire <pierre@lightpanda.io>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
/// This class doesn't implement a `constructor`.
/// It can be obtained with a call to `HTMLCanvasElement#getContext`.
/// https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D
const CanvasRenderingContext2D = @This();
pub fn _fillRect(x: f64, y: f64, width: f64, height: f64) void {
_ = x;
_ = y;
_ = width;
_ = height;
}
pub fn get_fillStyle(_: *const CanvasRenderingContext2D) []const u8 {
return "";
}
pub fn set_fillStyle(_: *const CanvasRenderingContext2D, _: []const u8) void {}

6
src/browser/canvas/root.zig Normal file
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@@ -0,0 +1,6 @@
//! Canvas API.
//! https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API
pub const Interfaces = .{
@import("./CanvasRenderingContext2D.zig"),
};

22
src/browser/html/elements.zig
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@@ -32,6 +32,7 @@ const DataSet = @import("DataSet.zig");
const StyleSheet = @import("../cssom/StyleSheet.zig");
const CSSStyleDeclaration = @import("../cssom/CSSStyleDeclaration.zig");
const CanvasRenderingContext2D = @import("../canvas/CanvasRenderingContext2D.zig");
// HTMLElement interfaces
pub const Interfaces = .{
@@ -487,6 +488,23 @@ pub const HTMLCanvasElement = struct {
pub const Self = parser.Canvas;
pub const prototype = *HTMLElement;
pub const subtype = .node;
/// This should be a union once we support other context types.
const ContextAttributes = struct {
alpha: bool,
color_space: []const u8 = "srgb",
};
pub fn _getContext(
ctx_type: []const u8,
_: ?ContextAttributes,
) !CanvasRenderingContext2D {
if (!std.mem.eql(u8, ctx_type, "2d")) {
return error.NotSupported;
}
return .{};
}
};
pub const HTMLDListElement = struct {
@@ -1356,3 +1374,7 @@ test "Browser: HTML.HtmlScriptElement" {
test "Browser: HTML.HtmlSlotElement" {
try testing.htmlRunner("html/slot.html");
}
test "Browser: HTML.HTMLCanvasElement" {
try testing.htmlRunner("html/canvas.html");
}

1
src/browser/js/types.zig
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@@ -18,6 +18,7 @@ const Interfaces = generate.Tuple(.{
@import("../xhr/xhr.zig").Interfaces,
@import("../navigation/root.zig").Interfaces,
@import("../file/root.zig").Interfaces,
@import("../canvas/root.zig").Interfaces,
@import("../xhr/form_data.zig").Interfaces,
@import("../xmlserializer/xmlserializer.zig").Interfaces,
@import("../fetch/fetch.zig").Interfaces,

11
src/tests/html/canvas.html Normal file
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@@ -0,0 +1,11 @@
<!DOCTYPE html>
<script src="../testing.js"></script>
<script id=canvas>
const element = document.createElement("canvas");
const ctx = element.getContext("2d");
testing.expectEqual(true, ctx instanceof CanvasRenderingContext2D);
// We can't really test this but let's try to call it.
ctx.fillRect(0, 0, 0, 0);
testing.expectEqual("", ctx.fillStyle);
</script>