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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 <LibGfx/ImageDecoder.h>
29#include <LibWeb/CSS/StyleResolver.h>
30#include <LibWeb/DOM/Document.h>
31#include <LibWeb/DOM/HTMLImageElement.h>
32#include <LibWeb/Layout/LayoutImage.h>
33#include <LibWeb/ResourceLoader.h>
34
35namespace Web {
36
37HTMLImageElement::HTMLImageElement(Document& document, const FlyString& tag_name)
38 : HTMLElement(document, tag_name)
39{
40}
41
42HTMLImageElement::~HTMLImageElement()
43{
44}
45
46void HTMLImageElement::parse_attribute(const FlyString& name, const String& value)
47{
48 if (name.equals_ignoring_case("src"))
49 load_image(value);
50}
51
52void HTMLImageElement::load_image(const String& src)
53{
54 URL src_url = document().complete_url(src);
55 ResourceLoader::the().load(src_url, [this, weak_element = make_weak_ptr()](auto data) {
56 if (!weak_element) {
57 dbg() << "HTMLImageElement: Load completed after element destroyed.";
58 return;
59 }
60 if (data.is_null()) {
61 dbg() << "HTMLImageElement: Failed to load " << this->src();
62 return;
63 }
64
65 m_encoded_data = data;
66 m_image_decoder = Gfx::ImageDecoder::create(m_encoded_data.data(), m_encoded_data.size());
67 document().update_layout();
68 });
69}
70
71int HTMLImageElement::preferred_width() const
72{
73 bool ok = false;
74 int width = attribute("width").to_int(ok);
75 if (ok)
76 return width;
77
78 if (m_image_decoder)
79 return m_image_decoder->width();
80
81 return 0;
82}
83
84int HTMLImageElement::preferred_height() const
85{
86 bool ok = false;
87 int height = attribute("height").to_int(ok);
88 if (ok)
89 return height;
90
91 if (m_image_decoder)
92 return m_image_decoder->height();
93
94 return 0;
95}
96
97RefPtr<LayoutNode> HTMLImageElement::create_layout_node(const StyleProperties* parent_style) const
98{
99 auto style = document().style_resolver().resolve_style(*this, parent_style);
100 auto display = style->string_or_fallback(CSS::PropertyID::Display, "inline");
101 if (display == "none")
102 return nullptr;
103 return adopt(*new LayoutImage(*this, move(style)));
104}
105
106const Gfx::Bitmap* HTMLImageElement::bitmap() const
107{
108 if (!m_image_decoder)
109 return nullptr;
110 return m_image_decoder->bitmap();
111}
112
113void HTMLImageElement::set_volatile(Badge<LayoutDocument>, bool v)
114{
115 if (!m_image_decoder)
116 return;
117 if (v) {
118 m_image_decoder->set_volatile();
119 return;
120 }
121 bool has_image = m_image_decoder->set_nonvolatile();
122 if (has_image)
123 return;
124 m_image_decoder = Gfx::ImageDecoder::create(m_encoded_data.data(), m_encoded_data.size());
125}
126
127}