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62ae4e878f
We already had the API, but drawing to the canvas was not affected by any created CanvasPattern. This moves CanvasPatternPaintStyle to LibGfx so we don't have to reach into LibWeb, and implements the plumbing to let Skia use images as a fill pattern.
79 lines
2.9 KiB
C++
79 lines
2.9 KiB
C++
/*
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* Copyright (c) 2023, MacDue <macdue@dueutil.tech>
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* Copyright (c) 2024, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
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* Copyright (c) 2025, Jelle Raaijmakers <jelle@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/Bindings/CanvasPatternPrototype.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/HTML/CanvasPattern.h>
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#include <LibWeb/HTML/CanvasRenderingContext2D.h>
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namespace Web::HTML {
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GC_DEFINE_ALLOCATOR(CanvasPattern);
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CanvasPattern::CanvasPattern(JS::Realm& realm, Gfx::CanvasPatternPaintStyle& pattern)
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: PlatformObject(realm)
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, m_pattern(pattern)
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{
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}
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CanvasPattern::~CanvasPattern() = default;
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// https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-createpattern
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WebIDL::ExceptionOr<GC::Ptr<CanvasPattern>> CanvasPattern::create(JS::Realm& realm, CanvasImageSource const& image, StringView repetition)
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{
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auto parse_repetition = [&](auto value) -> Optional<Gfx::CanvasPatternPaintStyle::Repetition> {
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if (value == "repeat"sv)
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return Gfx::CanvasPatternPaintStyle::Repetition::Repeat;
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if (value == "repeat-x"sv)
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return Gfx::CanvasPatternPaintStyle::Repetition::RepeatX;
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if (value == "repeat-y"sv)
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return Gfx::CanvasPatternPaintStyle::Repetition::RepeatY;
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if (value == "no-repeat"sv)
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return Gfx::CanvasPatternPaintStyle::Repetition::NoRepeat;
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return {};
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};
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// 1. Let usability be the result of checking the usability of image.
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auto usability = TRY(check_usability_of_image(image));
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// 2. If usability is bad, then return null.
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if (usability == CanvasImageSourceUsability::Bad)
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return GC::Ptr<CanvasPattern> {};
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// 3. Assert: usability is good.
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VERIFY(usability == CanvasImageSourceUsability::Good);
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// 4. If repetition is the empty string, then set it to "repeat".
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if (repetition.is_empty())
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repetition = "repeat"sv;
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// 5. If repetition is not identical to one of "repeat", "repeat-x", "repeat-y", or "no-repeat",
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// then throw a "SyntaxError" DOMException.
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auto repetition_value = parse_repetition(repetition);
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if (!repetition_value.has_value())
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return WebIDL::SyntaxError::create(realm, "Repetition value is not valid"_utf16);
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// 6. Let pattern be a new CanvasPattern object with the image image and the repetition behavior given by repetition.
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auto immutable_bitmap = canvas_image_source_bitmap(image);
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auto paint_style = TRY_OR_THROW_OOM(realm.vm(), Gfx::CanvasPatternPaintStyle::create(immutable_bitmap, *repetition_value));
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auto pattern = realm.create<CanvasPattern>(realm, *paint_style);
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// FIXME: 7. If image is not origin-clean, then mark pattern as not origin-clean.
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// 8. Return pattern.
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return pattern;
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}
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void CanvasPattern::initialize(JS::Realm& realm)
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{
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WEB_SET_PROTOTYPE_FOR_INTERFACE(CanvasPattern);
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Base::initialize(realm);
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}
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}
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