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/*
* Copyright (c) 2023, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGfx/Bitmap.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/Fetch/Infrastructure/HTTP/Responses.h>
#include <LibWeb/HTML/BrowsingContext.h>
#include <LibWeb/HTML/NavigationParams.h>
#include <LibWeb/HTML/Parser/HTMLParser.h>
#include <LibWeb/Layout/Viewport.h>
#include <LibWeb/Painting/PaintContext.h>
#include <LibWeb/SVG/SVGDecodedImageData.h>
#include <LibWeb/SVG/SVGSVGElement.h>
namespace Web::SVG {
class SVGDecodedImageData::SVGPageClient final : public PageClient {
public:
explicit SVGPageClient(Page& host_page)
: m_host_page(host_page)
{
}
virtual ~SVGPageClient() override = default;
Page& m_host_page;
Page* m_svg_page { nullptr };
virtual Page& page() override { return *m_svg_page; }
virtual Page const& page() const override { return *m_svg_page; }
virtual bool is_connection_open() const override { return false; }
virtual Gfx::Palette palette() const override { return m_host_page.client().palette(); }
virtual DevicePixelRect screen_rect() const override { return {}; }
virtual float device_pixels_per_css_pixel() const override { return m_host_page.client().device_pixels_per_css_pixel(); }
virtual CSS::PreferredColorScheme preferred_color_scheme() const override { return m_host_page.client().preferred_color_scheme(); }
virtual void request_file(FileRequest) override { }
virtual void paint(DevicePixelRect const&, Gfx::Bitmap&) override { }
};
ErrorOr<NonnullRefPtr<SVGDecodedImageData>> SVGDecodedImageData::create(Page& host_page, AK::URL const& url, ByteBuffer data)
{
auto page_client = make<SVGPageClient>(host_page);
auto page = make<Page>(*page_client);
page_client->m_svg_page = page.ptr();
auto browsing_context = HTML::BrowsingContext::create_a_new_top_level_browsing_context(*page);
auto response = Fetch::Infrastructure::Response::create(browsing_context->vm());
response->url_list().append(url);
HTML::NavigationParams navigation_params {
.id = {},
.request = nullptr,
.response = response,
.origin = HTML::Origin {},
.policy_container = HTML::PolicyContainer {},
.final_sandboxing_flag_set = HTML::SandboxingFlagSet {},
.cross_origin_opener_policy = HTML::CrossOriginOpenerPolicy {},
.coop_enforcement_result = HTML::CrossOriginOpenerPolicyEnforcementResult {},
.reserved_environment = {},
.browsing_context = browsing_context,
.navigable = nullptr,
};
auto document = DOM::Document::create_and_initialize(DOM::Document::Type::HTML, "text/html", move(navigation_params)).release_value_but_fixme_should_propagate_errors();
browsing_context->set_active_document(document);
auto parser = HTML::HTMLParser::create_with_uncertain_encoding(document, data);
parser->run(document->url());
// Perform some DOM surgery to make the SVG root element be the first child of the Document.
// FIXME: This is a huge hack until we figure out how to actually parse separate SVG files.
auto* svg_root = document->body()->first_child_of_type<SVG::SVGSVGElement>();
svg_root->remove();
document->remove_all_children();
MUST(document->append_child(*svg_root));
return adopt_nonnull_ref_or_enomem(new (nothrow) SVGDecodedImageData(move(page), move(page_client), move(document), move(svg_root)));
}
SVGDecodedImageData::SVGDecodedImageData(NonnullOwnPtr<Page> page, NonnullOwnPtr<SVGPageClient> page_client, JS::Handle<DOM::Document> document, JS::Handle<SVG::SVGSVGElement> root_element)
: m_page(move(page))
, m_page_client(move(page_client))
, m_document(move(document))
, m_root_element(move(root_element))
{
}
SVGDecodedImageData::~SVGDecodedImageData() = default;
void SVGDecodedImageData::render(Gfx::IntSize size) const
{
m_document->browsing_context()->set_viewport_rect({ 0, 0, size.width(), size.height() });
m_document->update_layout();
Gfx::Painter painter(*m_bitmap);
PaintContext context(painter, m_page_client->palette(), m_page_client->device_pixels_per_css_pixel());
m_document->layout_node()->paint_all_phases(context);
}
RefPtr<Gfx::Bitmap const> SVGDecodedImageData::bitmap(size_t, Gfx::IntSize size) const
{
if (size.is_empty())
return nullptr;
if (m_bitmap && m_bitmap->size() == size)
return m_bitmap;
m_bitmap = Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, size).release_value_but_fixme_should_propagate_errors();
render(size);
return m_bitmap;
}
Optional<CSSPixels> SVGDecodedImageData::intrinsic_width() const
{
// https://www.w3.org/TR/SVG2/coords.html#SizingSVGInCSS
m_document->update_style();
auto const* root_element_style = m_root_element->computed_css_values();
VERIFY(root_element_style);
auto const& width_value = root_element_style->size_value(CSS::PropertyID::Width);
if (width_value.is_length() && width_value.length().is_absolute())
return width_value.length().absolute_length_to_px();
return {};
}
Optional<CSSPixels> SVGDecodedImageData::intrinsic_height() const
{
// https://www.w3.org/TR/SVG2/coords.html#SizingSVGInCSS
m_document->update_style();
auto const* root_element_style = m_root_element->computed_css_values();
VERIFY(root_element_style);
auto const& height_value = root_element_style->size_value(CSS::PropertyID::Height);
if (height_value.is_length() && height_value.length().is_absolute())
return height_value.length().absolute_length_to_px();
return {};
}
Optional<float> SVGDecodedImageData::intrinsic_aspect_ratio() const
{
// https://www.w3.org/TR/SVG2/coords.html#SizingSVGInCSS
auto width = intrinsic_width();
auto height = intrinsic_height();
if (width.has_value() && height.has_value())
return (width.value() / height.value()).value();
if (auto const& viewbox = m_root_element->view_box(); viewbox.has_value())
return viewbox->width / viewbox->height;
return {};
}
}
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