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e926b4cbfb
This was already the case for `context.createImageData()`, but I forgot to do the same for `new ImageData()`. Add a regression test for both cases.
128 lines
4.9 KiB
C++
128 lines
4.9 KiB
C++
/*
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* Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2024, Kenneth Myhra <kennethmyhra@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGfx/Bitmap.h>
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#include <LibJS/Runtime/TypedArray.h>
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#include <LibWeb/Bindings/ImageDataPrototype.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/HTML/ImageData.h>
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#include <LibWeb/WebIDL/Buffers.h>
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#include <LibWeb/WebIDL/DOMException.h>
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#include <LibWeb/WebIDL/ExceptionOr.h>
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namespace Web::HTML {
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JS_DEFINE_ALLOCATOR(ImageData);
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// https://html.spec.whatwg.org/multipage/canvas.html#dom-imagedata
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WebIDL::ExceptionOr<JS::NonnullGCPtr<ImageData>> ImageData::create(JS::Realm& realm, u32 sw, u32 sh, Optional<ImageDataSettings> const&)
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{
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auto& vm = realm.vm();
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// 1. If one or both of sw and sh are zero, then throw an "IndexSizeError" DOMException.
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if (sw == 0 || sh == 0)
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return WebIDL::IndexSizeError::create(realm, "The source width and height must be greater than zero."_fly_string);
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// 2. Initialize this given sw, sh, and settings set to settings.
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// 3. Initialize the image data of this to transparent black.
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auto data = TRY(JS::Uint8ClampedArray::create(realm, sw * sh * 4));
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auto bitmap = TRY_OR_THROW_OOM(vm, Gfx::Bitmap::create_wrapper(Gfx::BitmapFormat::RGBA8888, Gfx::AlphaType::Unpremultiplied, Gfx::IntSize(sw, sh), sw * sizeof(u32), data->data().data()));
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return realm.heap().allocate<ImageData>(realm, realm, bitmap, data);
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}
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WebIDL::ExceptionOr<JS::NonnullGCPtr<ImageData>> ImageData::construct_impl(JS::Realm& realm, u32 sw, u32 sh, Optional<ImageDataSettings> const& settings)
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{
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return ImageData::create(realm, sw, sh, settings);
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}
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// https://html.spec.whatwg.org/multipage/canvas.html#dom-imagedata-with-data
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WebIDL::ExceptionOr<JS::NonnullGCPtr<ImageData>> ImageData::create(JS::Realm& realm, JS::Handle<WebIDL::BufferSource> const& data, u32 sw, Optional<u32> sh, Optional<ImageDataSettings> const&)
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{
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auto& vm = realm.vm();
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if (!is<JS::Uint8ClampedArray>(*data->raw_object()))
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return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Uint8ClampedArray");
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auto& uint8_clamped_array_data = static_cast<JS::Uint8ClampedArray&>(*data->raw_object());
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// 1. Let length be the number of bytes in data.
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auto length = uint8_clamped_array_data.byte_length().length();
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// 2. If length is not a nonzero integral multiple of four, then throw an "InvalidStateError" DOMException.
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if (length == 0 || length % 4 != 0)
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return WebIDL::InvalidStateError::create(realm, "Source data must have a non-sero length that is a multiple of four."_fly_string);
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// 3. Let length be length divided by four.
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length = length / 4;
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// 4. If length is not an integral multiple of sw, then throw an "IndexSizeError" DOMException.
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// NOTE: At this step, the length is guaranteed to be greater than zero (otherwise the second step above would have aborted the steps),
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// so if sw is zero, this step will throw the exception and return.
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if (sw == 0 || length % sw != 0)
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return WebIDL::IndexSizeError::create(realm, "Source width must be a multiple of source data's length."_fly_string);
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// 5. Let height be length divided by sw.
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auto height = length / sw;
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// 6. If sh was given and its value is not equal to height, then throw an "IndexSizeError" DOMException.
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if (sh.has_value() && sh.value() != height)
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return WebIDL::IndexSizeError::create(realm, "Source height must be equal to the calculated height of the data."_fly_string);
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// 7. Initialize this given sw, sh, settings set to settings, and source set to data.
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auto bitmap = TRY_OR_THROW_OOM(vm, Gfx::Bitmap::create_wrapper(Gfx::BitmapFormat::RGBA8888, Gfx::AlphaType::Unpremultiplied, Gfx::IntSize(sw, height), sw * sizeof(u32), uint8_clamped_array_data.data().data()));
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return realm.heap().allocate<ImageData>(realm, realm, bitmap, uint8_clamped_array_data);
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}
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WebIDL::ExceptionOr<JS::NonnullGCPtr<ImageData>> ImageData::construct_impl(JS::Realm& realm, JS::Handle<WebIDL::BufferSource> const& data, u32 sw, Optional<u32> sh, Optional<ImageDataSettings> const& settings)
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{
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return ImageData::create(realm, data, sw, move(sh), settings);
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}
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ImageData::ImageData(JS::Realm& realm, NonnullRefPtr<Gfx::Bitmap> bitmap, JS::NonnullGCPtr<JS::Uint8ClampedArray> data)
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: PlatformObject(realm)
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, m_bitmap(move(bitmap))
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, m_data(move(data))
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{
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}
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ImageData::~ImageData() = default;
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void ImageData::initialize(JS::Realm& realm)
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{
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Base::initialize(realm);
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WEB_SET_PROTOTYPE_FOR_INTERFACE(ImageData);
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}
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void ImageData::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_data);
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}
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unsigned ImageData::width() const
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{
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return m_bitmap->width();
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}
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unsigned ImageData::height() const
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{
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return m_bitmap->height();
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}
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JS::Uint8ClampedArray* ImageData::data()
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{
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return m_data;
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}
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const JS::Uint8ClampedArray* ImageData::data() const
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{
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return m_data;
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}
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}
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