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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <LibGfx/Bitmap.h>
28#include <LibWeb/CSS/StyleResolver.h>
29#include <LibWeb/DOM/CanvasRenderingContext2D.h>
30#include <LibWeb/DOM/Document.h>
31#include <LibWeb/DOM/HTMLCanvasElement.h>
32#include <LibWeb/Layout/LayoutCanvas.h>
33
34namespace Web {
35
36HTMLCanvasElement::HTMLCanvasElement(Document& document, const FlyString& tag_name)
37 : HTMLElement(document, tag_name)
38{
39}
40
41HTMLCanvasElement::~HTMLCanvasElement()
42{
43}
44
45int HTMLCanvasElement::preferred_width() const
46{
47 bool ok = false;
48 int width = attribute("width").to_int(ok);
49 if (ok)
50 return width;
51
52 return 300;
53}
54
55int HTMLCanvasElement::preferred_height() const
56{
57 bool ok = false;
58 int height = attribute("height").to_int(ok);
59 if (ok)
60 return height;
61
62 return 150;
63}
64
65RefPtr<LayoutNode> HTMLCanvasElement::create_layout_node(const StyleProperties* parent_style) const
66{
67 auto style = document().style_resolver().resolve_style(*this, parent_style);
68 auto display = style->string_or_fallback(CSS::PropertyID::Display, "inline");
69 if (display == "none")
70 return nullptr;
71 return adopt(*new LayoutCanvas(*this, move(style)));
72}
73
74CanvasRenderingContext2D* HTMLCanvasElement::get_context(String type)
75{
76 ASSERT(type.to_lowercase() == "2d");
77 if (!m_context)
78 m_context = CanvasRenderingContext2D::create(*this);
79 return m_context;
80}
81
82Gfx::Bitmap& HTMLCanvasElement::ensure_bitmap()
83{
84 if (!m_bitmap || m_bitmap->size() != Gfx::Size(preferred_width(), preferred_height())) {
85 m_bitmap = Gfx::Bitmap::create(Gfx::BitmapFormat::RGBA32, { preferred_width(), preferred_height() });
86 }
87 return *m_bitmap;
88}
89
90}