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Serenity Operating System
1/*
2 * Copyright (c) 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 <AK/OwnPtr.h>
28#include <LibGfx/Painter.h>
29#include <LibWeb/DOM/CanvasRenderingContext2D.h>
30#include <LibWeb/DOM/HTMLCanvasElement.h>
31
32namespace Web {
33
34CanvasRenderingContext2D::CanvasRenderingContext2D(HTMLCanvasElement& element)
35 : m_element(element.make_weak_ptr())
36{
37}
38
39CanvasRenderingContext2D::~CanvasRenderingContext2D()
40{
41}
42
43void CanvasRenderingContext2D::set_fill_style(String style)
44{
45 m_fill_style = Gfx::Color::from_string(style).value_or(Color::Black);
46}
47
48String CanvasRenderingContext2D::fill_style() const
49{
50 return m_fill_style.to_string();
51}
52
53void CanvasRenderingContext2D::fill_rect(float x, float y, float width, float height)
54{
55 auto painter = this->painter();
56 if (!painter)
57 return;
58
59 Gfx::FloatRect rect = compute_rect(x, y, width, height);
60 painter->fill_rect(enclosing_int_rect(rect), m_fill_style);
61 did_draw(rect);
62}
63
64void CanvasRenderingContext2D::set_stroke_style(String style)
65{
66 m_stroke_style = Gfx::Color::from_string(style).value_or(Color::Black);
67}
68
69String CanvasRenderingContext2D::stroke_style() const
70{
71 return m_fill_style.to_string();
72}
73
74void CanvasRenderingContext2D::stroke_rect(float x, float y, float width, float height)
75{
76 auto painter = this->painter();
77 if (!painter)
78 return;
79
80 Gfx::FloatRect rect = compute_rect(x, y, width, height);
81 painter->draw_rect(enclosing_int_rect(rect), m_stroke_style);
82 did_draw(rect);
83}
84
85void CanvasRenderingContext2D::scale(float sx, float sy)
86{
87 // FIXME: Actually do something with the scale factor!
88 dbg() << "CanvasRenderingContext2D::scale(): " << String::format("%f", sx) << ", " << String::format("%f", sy);
89 m_scale_x = sx;
90 m_scale_y = sy;
91}
92
93void CanvasRenderingContext2D::translate(float x, float y)
94{
95 // FIXME: Actually do something with the translation!
96 dbg() << "CanvasRenderingContext2D::translate(): " << String::format("%f", x) << ", " << String::format("%f", y);
97 m_translate_x = x;
98 m_translate_y = y;
99}
100
101Gfx::FloatRect CanvasRenderingContext2D::compute_rect(float x, float y, float width, float height)
102{
103 return {
104 (x + m_translate_x) * m_scale_x,
105 (y + m_translate_y) * m_scale_y,
106 width * m_scale_x,
107 height * m_scale_y
108 };
109}
110
111void CanvasRenderingContext2D::did_draw(const Gfx::FloatRect&)
112{
113 // FIXME: Make use of the rect to reduce the invalidated area when possible.
114 if (!m_element)
115 return;
116 if (!m_element->layout_node())
117 return;
118 m_element->layout_node()->set_needs_display();
119}
120
121OwnPtr<Gfx::Painter> CanvasRenderingContext2D::painter()
122{
123 if (!m_element)
124 return nullptr;
125
126 return make<Gfx::Painter>(m_element->ensure_bitmap());
127}
128
129}