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