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LibWeb: Delegate painting surface allocation to canvas's active context

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This change prepares for the addition of WebGL support, where painting
surface allocation process will differ from that of context2d.
This commit is contained in:
Aliaksandr Kalenik 2024-11-29 20:17:25 +01:00 • committed by Alexander Kalenik
commit f719b05ab9
Notes: github-actions[bot] 2024-12-03 22:37:53 +00:00
8 changed files with 116 additions and 67 deletions
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21
Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp
View file

@ -21,6 +21,7 @@
#include <LibWeb/HTML/ImageData.h>
#include <LibWeb/HTML/Path2D.h>
#include <LibWeb/HTML/TextMetrics.h>
#include <LibWeb/HTML/TraversableNavigable.h>
#include <LibWeb/Infra/CharacterTypes.h>
#include <LibWeb/Layout/TextNode.h>
#include <LibWeb/Painting/Paintable.h>
@ -41,6 +42,7 @@ CanvasRenderingContext2D::CanvasRenderingContext2D(JS::Realm& realm, HTMLCanvasE
: PlatformObject(realm)
, CanvasPath(static_cast<Bindings::PlatformObject&>(*this), *this)
, m_element(element)
, m_size(element.bitmap_size_for_canvas())
{
}
@ -198,14 +200,29 @@ void CanvasRenderingContext2D::did_draw(Gfx::FloatRect const&)
Gfx::Painter* CanvasRenderingContext2D::painter()
{
if (!canvas_element().surface()) {
if (!canvas_element().allocate_painting_surface())
return nullptr;
allocate_painting_surface_if_needed();
canvas_element().document().invalidate_display_list();
m_painter = make<Gfx::PainterSkia>(*canvas_element().surface());
}
return m_painter.ptr();
}
void CanvasRenderingContext2D::set_size(Gfx::IntSize const& size)
{
if (m_size == size)
return;
m_size = size;
m_surface = nullptr;
}
void CanvasRenderingContext2D::allocate_painting_surface_if_needed()
{
if (m_surface)
return;
auto skia_backend_context = canvas_element().navigable()->traversable_navigable()->skia_backend_context();
m_surface = Gfx::PaintingSurface::create_with_size(skia_backend_context, canvas_element().bitmap_size_for_canvas(), Gfx::BitmapFormat::BGRA8888, Gfx::AlphaType::Premultiplied);
}
Gfx::Path CanvasRenderingContext2D::text_path(StringView text, float x, float y, Optional<double> max_width)
{
if (max_width.has_value() && max_width.value() <= 0)