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Merge pull request #1199 from lightpanda-io/nikneym/dummy-canvas
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Browse Source 
Dummy canvas
This commit is contained in:
Pierre Tachoire
2025-11-13 08:28:24 +01:00
committed by GitHub
parent 4538464df4 d48a6619a3
commit b782cc6389
7 changed files with 402 additions and 3 deletions
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58
src/browser/canvas/CanvasRenderingContext2D.zig Normal file
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@@ -0,0 +1,58 @@
// 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/>.
const std = @import("std");
const color = @import("../cssom/color.zig");
const Page = @import("../page.zig").Page;
/// 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();
/// Fill color.
/// TODO: Add support for `CanvasGradient` and `CanvasPattern`.
fill_style: color.RGBA = color.RGBA.Named.black,
pub fn _fillRect(
self: *const CanvasRenderingContext2D,
x: f64,
y: f64,
width: f64,
height: f64,
) void {
_ = self;
_ = x;
_ = y;
_ = width;
_ = height;
}
pub fn get_fillStyle(self: *const CanvasRenderingContext2D, page: *Page) ![]const u8 {
var w = std.Io.Writer.Allocating.init(page.call_arena);
try self.fill_style.format(&w.writer);
return w.written();
}
pub fn set_fillStyle(
self: *CanvasRenderingContext2D,
value: []const u8,
) !void {
// Prefer the same fill_style if fails.
self.fill_style = color.RGBA.parse(value) catch self.fill_style;
}

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"),
};

6
src/browser/cssom/CSSStyleDeclaration.zig
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@@ -190,7 +190,7 @@ fn isNumericWithUnit(value: []const u8) bool {
return CSSKeywords.isValidUnit(unit);
}
fn isHexColor(value: []const u8) bool {
pub fn isHexColor(value: []const u8) bool {
if (value.len == 0) {
return false;
}
@@ -199,7 +199,7 @@ fn isHexColor(value: []const u8) bool {
}
const hex_part = value[1..];
if (hex_part.len != 3 and hex_part.len != 6 and hex_part.len != 8) {
if (hex_part.len != 3 and hex_part.len != 4 and hex_part.len != 6 and hex_part.len != 8) {
return false;
}
@@ -551,6 +551,7 @@ test "Browser: CSS.StyleDeclaration: isNumericWithUnit - edge cases and invalid
test "Browser: CSS.StyleDeclaration: isHexColor - valid hex colors" {
try testing.expect(isHexColor("#000"));
try testing.expect(isHexColor("#0000"));
try testing.expect(isHexColor("#fff"));
try testing.expect(isHexColor("#123456"));
try testing.expect(isHexColor("#abcdef"));
@@ -563,7 +564,6 @@ test "Browser: CSS.StyleDeclaration: isHexColor - invalid hex colors" {
try testing.expect(!isHexColor("#"));
try testing.expect(!isHexColor("000"));
try testing.expect(!isHexColor("#00"));
try testing.expect(!isHexColor("#0000"));
try testing.expect(!isHexColor("#00000"));
try testing.expect(!isHexColor("#0000000"));
try testing.expect(!isHexColor("#000000000"));

283
src/browser/cssom/color.zig Normal file
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@@ -0,0 +1,283 @@
// 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/>.
const std = @import("std");
const Io = std.Io;
const CSSParser = @import("CSSParser.zig");
const isHexColor = @import("CSSStyleDeclaration.zig").isHexColor;
pub const RGBA = packed struct(u32) {
r: u8,
g: u8,
b: u8,
/// Opaque by default.
a: u8 = std.math.maxInt(u8),
pub const Named = struct {
// Basic colors (CSS Level 1)
pub const black: RGBA = .init(0, 0, 0, 1);
pub const silver: RGBA = .init(192, 192, 192, 1);
pub const gray: RGBA = .init(128, 128, 128, 1);
pub const white: RGBA = .init(255, 255, 255, 1);
pub const maroon: RGBA = .init(128, 0, 0, 1);
pub const red: RGBA = .init(255, 0, 0, 1);
pub const purple: RGBA = .init(128, 0, 128, 1);
pub const fuchsia: RGBA = .init(255, 0, 255, 1);
pub const green: RGBA = .init(0, 128, 0, 1);
pub const lime: RGBA = .init(0, 255, 0, 1);
pub const olive: RGBA = .init(128, 128, 0, 1);
pub const yellow: RGBA = .init(255, 255, 0, 1);
pub const navy: RGBA = .init(0, 0, 128, 1);
pub const blue: RGBA = .init(0, 0, 255, 1);
pub const teal: RGBA = .init(0, 128, 128, 1);
pub const aqua: RGBA = .init(0, 255, 255, 1);
// Extended colors (CSS Level 2+)
pub const aliceblue: RGBA = .init(240, 248, 255, 1);
pub const antiquewhite: RGBA = .init(250, 235, 215, 1);
pub const aquamarine: RGBA = .init(127, 255, 212, 1);
pub const azure: RGBA = .init(240, 255, 255, 1);
pub const beige: RGBA = .init(245, 245, 220, 1);
pub const bisque: RGBA = .init(255, 228, 196, 1);
pub const blanchedalmond: RGBA = .init(255, 235, 205, 1);
pub const blueviolet: RGBA = .init(138, 43, 226, 1);
pub const brown: RGBA = .init(165, 42, 42, 1);
pub const burlywood: RGBA = .init(222, 184, 135, 1);
pub const cadetblue: RGBA = .init(95, 158, 160, 1);
pub const chartreuse: RGBA = .init(127, 255, 0, 1);
pub const chocolate: RGBA = .init(210, 105, 30, 1);
pub const coral: RGBA = .init(255, 127, 80, 1);
pub const cornflowerblue: RGBA = .init(100, 149, 237, 1);
pub const cornsilk: RGBA = .init(255, 248, 220, 1);
pub const crimson: RGBA = .init(220, 20, 60, 1);
pub const cyan: RGBA = .init(0, 255, 255, 1); // Synonym of aqua
pub const darkblue: RGBA = .init(0, 0, 139, 1);
pub const darkcyan: RGBA = .init(0, 139, 139, 1);
pub const darkgoldenrod: RGBA = .init(184, 134, 11, 1);
pub const darkgray: RGBA = .init(169, 169, 169, 1);
pub const darkgreen: RGBA = .init(0, 100, 0, 1);
pub const darkgrey: RGBA = .init(169, 169, 169, 1); // Synonym of darkgray
pub const darkkhaki: RGBA = .init(189, 183, 107, 1);
pub const darkmagenta: RGBA = .init(139, 0, 139, 1);
pub const darkolivegreen: RGBA = .init(85, 107, 47, 1);
pub const darkorange: RGBA = .init(255, 140, 0, 1);
pub const darkorchid: RGBA = .init(153, 50, 204, 1);
pub const darkred: RGBA = .init(139, 0, 0, 1);
pub const darksalmon: RGBA = .init(233, 150, 122, 1);
pub const darkseagreen: RGBA = .init(143, 188, 143, 1);
pub const darkslateblue: RGBA = .init(72, 61, 139, 1);
pub const darkslategray: RGBA = .init(47, 79, 79, 1);
pub const darkslategrey: RGBA = .init(47, 79, 79, 1); // Synonym of darkslategray
pub const darkturquoise: RGBA = .init(0, 206, 209, 1);
pub const darkviolet: RGBA = .init(148, 0, 211, 1);
pub const deeppink: RGBA = .init(255, 20, 147, 1);
pub const deepskyblue: RGBA = .init(0, 191, 255, 1);
pub const dimgray: RGBA = .init(105, 105, 105, 1);
pub const dimgrey: RGBA = .init(105, 105, 105, 1); // Synonym of dimgray
pub const dodgerblue: RGBA = .init(30, 144, 255, 1);
pub const firebrick: RGBA = .init(178, 34, 34, 1);
pub const floralwhite: RGBA = .init(255, 250, 240, 1);
pub const forestgreen: RGBA = .init(34, 139, 34, 1);
pub const gainsboro: RGBA = .init(220, 220, 220, 1);
pub const ghostwhite: RGBA = .init(248, 248, 255, 1);
pub const gold: RGBA = .init(255, 215, 0, 1);
pub const goldenrod: RGBA = .init(218, 165, 32, 1);
pub const greenyellow: RGBA = .init(173, 255, 47, 1);
pub const grey: RGBA = .init(128, 128, 128, 1); // Synonym of gray
pub const honeydew: RGBA = .init(240, 255, 240, 1);
pub const hotpink: RGBA = .init(255, 105, 180, 1);
pub const indianred: RGBA = .init(205, 92, 92, 1);
pub const indigo: RGBA = .init(75, 0, 130, 1);
pub const ivory: RGBA = .init(255, 255, 240, 1);
pub const khaki: RGBA = .init(240, 230, 140, 1);
pub const lavender: RGBA = .init(230, 230, 250, 1);
pub const lavenderblush: RGBA = .init(255, 240, 245, 1);
pub const lawngreen: RGBA = .init(124, 252, 0, 1);
pub const lemonchiffon: RGBA = .init(255, 250, 205, 1);
pub const lightblue: RGBA = .init(173, 216, 230, 1);
pub const lightcoral: RGBA = .init(240, 128, 128, 1);
pub const lightcyan: RGBA = .init(224, 255, 255, 1);
pub const lightgoldenrodyellow: RGBA = .init(250, 250, 210, 1);
pub const lightgray: RGBA = .init(211, 211, 211, 1);
pub const lightgreen: RGBA = .init(144, 238, 144, 1);
pub const lightgrey: RGBA = .init(211, 211, 211, 1); // Synonym of lightgray
pub const lightpink: RGBA = .init(255, 182, 193, 1);
pub const lightsalmon: RGBA = .init(255, 160, 122, 1);
pub const lightseagreen: RGBA = .init(32, 178, 170, 1);
pub const lightskyblue: RGBA = .init(135, 206, 250, 1);
pub const lightslategray: RGBA = .init(119, 136, 153, 1);
pub const lightslategrey: RGBA = .init(119, 136, 153, 1); // Synonym of lightslategray
pub const lightsteelblue: RGBA = .init(176, 196, 222, 1);
pub const lightyellow: RGBA = .init(255, 255, 224, 1);
pub const limegreen: RGBA = .init(50, 205, 50, 1);
pub const linen: RGBA = .init(250, 240, 230, 1);
pub const magenta: RGBA = .init(255, 0, 255, 1); // Synonym of fuchsia
pub const mediumaquamarine: RGBA = .init(102, 205, 170, 1);
pub const mediumblue: RGBA = .init(0, 0, 205, 1);
pub const mediumorchid: RGBA = .init(186, 85, 211, 1);
pub const mediumpurple: RGBA = .init(147, 112, 219, 1);
pub const mediumseagreen: RGBA = .init(60, 179, 113, 1);
pub const mediumslateblue: RGBA = .init(123, 104, 238, 1);
pub const mediumspringgreen: RGBA = .init(0, 250, 154, 1);
pub const mediumturquoise: RGBA = .init(72, 209, 204, 1);
pub const mediumvioletred: RGBA = .init(199, 21, 133, 1);
pub const midnightblue: RGBA = .init(25, 25, 112, 1);
pub const mintcream: RGBA = .init(245, 255, 250, 1);
pub const mistyrose: RGBA = .init(255, 228, 225, 1);
pub const moccasin: RGBA = .init(255, 228, 181, 1);
pub const navajowhite: RGBA = .init(255, 222, 173, 1);
pub const oldlace: RGBA = .init(253, 245, 230, 1);
pub const olivedrab: RGBA = .init(107, 142, 35, 1);
pub const orange: RGBA = .init(255, 165, 0, 1);
pub const orangered: RGBA = .init(255, 69, 0, 1);
pub const orchid: RGBA = .init(218, 112, 214, 1);
pub const palegoldenrod: RGBA = .init(238, 232, 170, 1);
pub const palegreen: RGBA = .init(152, 251, 152, 1);
pub const paleturquoise: RGBA = .init(175, 238, 238, 1);
pub const palevioletred: RGBA = .init(219, 112, 147, 1);
pub const papayawhip: RGBA = .init(255, 239, 213, 1);
pub const peachpuff: RGBA = .init(255, 218, 185, 1);
pub const peru: RGBA = .init(205, 133, 63, 1);
pub const pink: RGBA = .init(255, 192, 203, 1);
pub const plum: RGBA = .init(221, 160, 221, 1);
pub const powderblue: RGBA = .init(176, 224, 230, 1);
pub const rebeccapurple: RGBA = .init(102, 51, 153, 1);
pub const rosybrown: RGBA = .init(188, 143, 143, 1);
pub const royalblue: RGBA = .init(65, 105, 225, 1);
pub const saddlebrown: RGBA = .init(139, 69, 19, 1);
pub const salmon: RGBA = .init(250, 128, 114, 1);
pub const sandybrown: RGBA = .init(244, 164, 96, 1);
pub const seagreen: RGBA = .init(46, 139, 87, 1);
pub const seashell: RGBA = .init(255, 245, 238, 1);
pub const sienna: RGBA = .init(160, 82, 45, 1);
pub const skyblue: RGBA = .init(135, 206, 235, 1);
pub const slateblue: RGBA = .init(106, 90, 205, 1);
pub const slategray: RGBA = .init(112, 128, 144, 1);
pub const slategrey: RGBA = .init(112, 128, 144, 1); // Synonym of slategray
pub const snow: RGBA = .init(255, 250, 250, 1);
pub const springgreen: RGBA = .init(0, 255, 127, 1);
pub const steelblue: RGBA = .init(70, 130, 180, 1);
pub const tan: RGBA = .init(210, 180, 140, 1);
pub const thistle: RGBA = .init(216, 191, 216, 1);
pub const tomato: RGBA = .init(255, 99, 71, 1);
pub const transparent: RGBA = .init(0, 0, 0, 0);
pub const turquoise: RGBA = .init(64, 224, 208, 1);
pub const violet: RGBA = .init(238, 130, 238, 1);
pub const wheat: RGBA = .init(245, 222, 179, 1);
pub const whitesmoke: RGBA = .init(245, 245, 245, 1);
pub const yellowgreen: RGBA = .init(154, 205, 50, 1);
};
pub fn init(r: u8, g: u8, b: u8, a: f32) RGBA {
const clamped = std.math.clamp(a, 0, 1);
return .{ .r = r, .g = g, .b = b, .a = @intFromFloat(clamped * 255) };
}
/// Finds a color by its name.
pub fn find(name: []const u8) ?RGBA {
const match = std.meta.stringToEnum(std.meta.DeclEnum(Named), name) orelse return null;
return switch (match) {
inline else => |comptime_enum| @field(Named, @tagName(comptime_enum)),
};
}
/// Parses the given color.
/// Currently we only parse hex colors and named colors; other variants
/// require CSS evaluation.
pub fn parse(input: []const u8) !RGBA {
if (!isHexColor(input)) {
// Try named colors.
return find(input) orelse return error.Invalid;
}
const slice = input[1..];
switch (slice.len) {
// This means the digit for a color is repeated.
// Given HEX is #f0c, its interpreted the same as #FF00CC.
3 => {
const r = try std.fmt.parseInt(u8, &.{ slice[0], slice[0] }, 16);
const g = try std.fmt.parseInt(u8, &.{ slice[1], slice[1] }, 16);
const b = try std.fmt.parseInt(u8, &.{ slice[2], slice[2] }, 16);
return .{ .r = r, .g = g, .b = b, .a = 255 };
},
4 => {
const r = try std.fmt.parseInt(u8, &.{ slice[0], slice[0] }, 16);
const g = try std.fmt.parseInt(u8, &.{ slice[1], slice[1] }, 16);
const b = try std.fmt.parseInt(u8, &.{ slice[2], slice[2] }, 16);
const a = try std.fmt.parseInt(u8, &.{ slice[3], slice[3] }, 16);
return .{ .r = r, .g = g, .b = b, .a = a };
},
// Regular HEX format.
6 => {
const r = try std.fmt.parseInt(u8, slice[0..2], 16);
const g = try std.fmt.parseInt(u8, slice[2..4], 16);
const b = try std.fmt.parseInt(u8, slice[4..6], 16);
return .{ .r = r, .g = g, .b = b, .a = 255 };
},
8 => {
const r = try std.fmt.parseInt(u8, slice[0..2], 16);
const g = try std.fmt.parseInt(u8, slice[2..4], 16);
const b = try std.fmt.parseInt(u8, slice[4..6], 16);
const a = try std.fmt.parseInt(u8, slice[6..8], 16);
return .{ .r = r, .g = g, .b = b, .a = a };
},
else => return error.Invalid,
}
}
/// By default, browsers prefer lowercase formatting.
const format_upper = false;
/// Formats the `Color` according to web expectations.
/// If color is opaque, HEX is preferred; RGBA otherwise.
pub fn format(self: *const RGBA, writer: *Io.Writer) Io.Writer.Error!void {
if (self.isOpaque()) {
// Convert RGB to HEX.
// https://gristle.tripod.com/hexconv.html
// Hexadecimal characters up to 15.
const char: []const u8 = "0123456789" ++ if (format_upper) "ABCDEF" else "abcdef";
// This variant always prefers 6 digit format, +1 is for hash char.
const buffer = [7]u8{
'#',
char[self.r >> 4],
char[self.r & 15],
char[self.g >> 4],
char[self.g & 15],
char[self.b >> 4],
char[self.b & 15],
};
return writer.writeAll(&buffer);
}
// Prefer RGBA format for everything else.
return writer.print("rgba({d}, {d}, {d}, {d:.2})", .{ self.r, self.g, self.b, self.normalizedAlpha() });
}
/// Returns true if `Color` is opaque.
pub inline fn isOpaque(self: *const RGBA) bool {
return self.a == std.math.maxInt(u8);
}
/// Returns the normalized alpha value.
pub inline fn normalizedAlpha(self: *const RGBA) f32 {
return @as(f32, @floatFromInt(self.a)) / 255;
}
};

22
src/browser/html/elements.zig
View File

@@ -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");
const WalkerChildren = @import("../dom/walker.zig").WalkerChildren;
@@ -489,6 +490,23 @@ 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 {
@@ -1369,3 +1387,7 @@ 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
View File

@@ -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,

29
src/tests/html/canvas.html Normal file
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@@ -0,0 +1,29 @@
<!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 at least.
ctx.fillRect(0, 0, 0, 0);
}
</script>
<script id=canvas#fillStyle>
{
const element = document.createElement("canvas");
const ctx = element.getContext("2d");
// Black by default.
testing.expectEqual(ctx.fillStyle, "#000000");
ctx.fillStyle = "red";
testing.expectEqual(ctx.fillStyle, "#ff0000");
ctx.fillStyle = "rebeccapurple";
testing.expectEqual(ctx.fillStyle, "#663399");
// No changes made if color is invalid.
ctx.fillStyle = "invalid-color";
testing.expectEqual(ctx.fillStyle, "#663399");
}
</script>