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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/Font.h>
28#include <LibGfx/StylePainter.h>
29#include <LibGUI/Painter.h>
30#include <LibHTML/Layout/LayoutImage.h>
31
32LayoutImage::LayoutImage(const HTMLImageElement& element, NonnullRefPtr<StyleProperties> style)
33 : LayoutReplaced(element, move(style))
34{
35}
36
37LayoutImage::~LayoutImage()
38{
39}
40
41void LayoutImage::layout()
42{
43 if (node().preferred_width() && node().preferred_height()) {
44 rect().set_width(node().preferred_width());
45 rect().set_height(node().preferred_height());
46 } else if (renders_as_alt_text()) {
47 auto& font = Gfx::Font::default_font();
48 auto alt = node().alt();
49 if (alt.is_empty())
50 alt = node().src();
51 rect().set_width(font.width(alt) + 16);
52 rect().set_height(font.glyph_height() + 16);
53 } else {
54 rect().set_width(16);
55 rect().set_height(16);
56 }
57
58 LayoutReplaced::layout();
59}
60
61void LayoutImage::render(RenderingContext& context)
62{
63 if (!is_visible())
64 return;
65
66 // FIXME: This should be done at a different level. Also rect() does not include padding etc!
67 if (!context.viewport_rect().intersects(enclosing_int_rect(rect())))
68 return;
69
70 if (renders_as_alt_text()) {
71 context.painter().set_font(Gfx::Font::default_font());
72 Gfx::StylePainter::paint_frame(context.painter(), enclosing_int_rect(rect()), context.palette(), Gfx::FrameShape::Container, Gfx::FrameShadow::Sunken, 2);
73 auto alt = node().alt();
74 if (alt.is_empty())
75 alt = node().src();
76 context.painter().draw_text(enclosing_int_rect(rect()), alt, Gfx::TextAlignment::Center, style().color_or_fallback(CSS::PropertyID::Color, document(), Color::Black), Gfx::TextElision::Right);
77 } else if (node().bitmap())
78 context.painter().draw_scaled_bitmap(enclosing_int_rect(rect()), *node().bitmap(), node().bitmap()->rect());
79 LayoutReplaced::render(context);
80}
81
82bool LayoutImage::renders_as_alt_text() const
83{
84 return !node().image_decoder();
85}