mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-20 17:58:18 +03:00
b91c49364d
This makes it more symmetrical with adopt_own() (which is used to create a NonnullOwnPtr from the result of a naked new.)
98 lines
2.6 KiB
C++
98 lines
2.6 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/Base64.h>
|
|
#include <AK/Checked.h>
|
|
#include <LibGfx/Bitmap.h>
|
|
#include <LibGfx/PNGWriter.h>
|
|
#include <LibWeb/CSS/StyleResolver.h>
|
|
#include <LibWeb/DOM/Document.h>
|
|
#include <LibWeb/HTML/CanvasRenderingContext2D.h>
|
|
#include <LibWeb/HTML/HTMLCanvasElement.h>
|
|
#include <LibWeb/Layout/CanvasBox.h>
|
|
|
|
namespace Web::HTML {
|
|
|
|
static constexpr auto max_canvas_area = 16384 * 16384;
|
|
|
|
HTMLCanvasElement::HTMLCanvasElement(DOM::Document& document, QualifiedName qualified_name)
|
|
: HTMLElement(document, move(qualified_name))
|
|
{
|
|
}
|
|
|
|
HTMLCanvasElement::~HTMLCanvasElement()
|
|
{
|
|
}
|
|
|
|
unsigned HTMLCanvasElement::width() const
|
|
{
|
|
return attribute(HTML::AttributeNames::width).to_uint().value_or(300);
|
|
}
|
|
|
|
unsigned HTMLCanvasElement::height() const
|
|
{
|
|
return attribute(HTML::AttributeNames::height).to_uint().value_or(150);
|
|
}
|
|
|
|
RefPtr<Layout::Node> HTMLCanvasElement::create_layout_node()
|
|
{
|
|
auto style = document().style_resolver().resolve_style(*this);
|
|
if (style->display() == CSS::Display::None)
|
|
return nullptr;
|
|
return adopt_ref(*new Layout::CanvasBox(document(), *this, move(style)));
|
|
}
|
|
|
|
CanvasRenderingContext2D* HTMLCanvasElement::get_context(String type)
|
|
{
|
|
VERIFY(type == "2d");
|
|
if (!m_context)
|
|
m_context = CanvasRenderingContext2D::create(*this);
|
|
return m_context;
|
|
}
|
|
|
|
static Gfx::IntSize bitmap_size_for_canvas(const HTMLCanvasElement& canvas)
|
|
{
|
|
auto width = canvas.width();
|
|
auto height = canvas.height();
|
|
|
|
Checked<size_t> area = width;
|
|
area *= height;
|
|
|
|
if (area.has_overflow()) {
|
|
dbgln("Refusing to create {}x{} canvas (overflow)", width, height);
|
|
return {};
|
|
}
|
|
if (area.value() > max_canvas_area) {
|
|
dbgln("Refusing to create {}x{} canvas (exceeds maximum size)", width, height);
|
|
return {};
|
|
}
|
|
return Gfx::IntSize(width, height);
|
|
}
|
|
|
|
bool HTMLCanvasElement::create_bitmap()
|
|
{
|
|
auto size = bitmap_size_for_canvas(*this);
|
|
if (size.is_empty()) {
|
|
m_bitmap = nullptr;
|
|
return false;
|
|
}
|
|
if (!m_bitmap || m_bitmap->size() != size)
|
|
m_bitmap = Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, size);
|
|
return m_bitmap;
|
|
}
|
|
|
|
String HTMLCanvasElement::to_data_url(const String& type, [[maybe_unused]] Optional<double> quality) const
|
|
{
|
|
if (!m_bitmap)
|
|
return {};
|
|
if (type != "image/png")
|
|
return {};
|
|
auto encoded_bitmap = Gfx::PNGWriter::encode(*m_bitmap);
|
|
return URL::create_with_data(type, encode_base64(encoded_bitmap), true).to_string();
|
|
}
|
|
|
|
}
|