29a4da30b7
The StyleResolver can find the specified CSS values for the parent element via the DOM. Forcing everyone to locate specified values for their parent was completely unnecessary.
105 lines
3.5 KiB
C++
105 lines
3.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Checked.h>
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#include <LibGfx/Bitmap.h>
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#include <LibWeb/CSS/StyleResolver.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/HTML/CanvasRenderingContext2D.h>
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#include <LibWeb/HTML/HTMLCanvasElement.h>
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#include <LibWeb/Layout/CanvasBox.h>
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namespace Web::HTML {
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static constexpr auto max_canvas_area = 16384 * 16384;
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HTMLCanvasElement::HTMLCanvasElement(DOM::Document& document, const QualifiedName& qualified_name)
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: HTMLElement(document, qualified_name)
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{
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}
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HTMLCanvasElement::~HTMLCanvasElement()
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{
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}
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unsigned HTMLCanvasElement::width() const
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{
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return attribute(HTML::AttributeNames::width).to_uint().value_or(300);
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}
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unsigned HTMLCanvasElement::height() const
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{
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return attribute(HTML::AttributeNames::height).to_uint().value_or(150);
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}
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RefPtr<Layout::Node> HTMLCanvasElement::create_layout_node()
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{
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auto style = document().style_resolver().resolve_style(*this);
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if (style->display() == CSS::Display::None)
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return nullptr;
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return adopt(*new Layout::CanvasBox(document(), *this, move(style)));
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}
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CanvasRenderingContext2D* HTMLCanvasElement::get_context(String type)
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{
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ASSERT(type == "2d");
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if (!m_context)
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m_context = CanvasRenderingContext2D::create(*this);
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return m_context;
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}
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static Gfx::IntSize bitmap_size_for_canvas(const HTMLCanvasElement& canvas)
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{
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auto width = canvas.width();
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auto height = canvas.height();
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Checked<size_t> area = width;
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area *= height;
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if (area.has_overflow()) {
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dbg() << "Refusing to create " << width << "x" << height << " canvas (overflow)";
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return {};
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}
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if (area.value() > max_canvas_area) {
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dbg() << "Refusing to create " << width << "x" << height << " canvas (exceeds maximum size)";
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return {};
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}
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return Gfx::IntSize(width, height);
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}
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bool HTMLCanvasElement::create_bitmap()
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{
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auto size = bitmap_size_for_canvas(*this);
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if (size.is_empty()) {
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m_bitmap = nullptr;
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return false;
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}
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if (!m_bitmap || m_bitmap->size() != size)
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m_bitmap = Gfx::Bitmap::create(Gfx::BitmapFormat::RGBA32, size);
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return m_bitmap;
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}
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}
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