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LibGfx+LibWeb: Specify bottom left origin for WebGL's PaintingSurface

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By doing that we eliminate the need for the vertical flip flag.

As a side effect it fixes the bug when doing:
`canvasContext2d.drawImage(canvasWithWebGLContext, 0, 0);`
produced a flipped image because we didn't account for different origin
while serializing PaintingSurface into Gfx::Bitmap.

Visual progress on https://ciechanow.ski/curves-and-surfaces/
This commit is contained in:
Aliaksandr Kalenik 2024-12-20 16:46:12 +01:00 committed by Alexander Kalenik
parent 28388f1fd2
commit 30d915c361
Notes: github-actions[bot] 2024-12-20 19:48:39 +00:00 
Author: https://github.com/kalenikaliaksandr
Commit: https://github.com/LadybirdBrowser/ladybird/commit/30d915c361b
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2994
4 changed files with 20 additions and 19 deletions
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15
Libraries/LibGfx/PaintingSurface.cpp
View file

@ -56,7 +56,7 @@ NonnullRefPtr<PaintingSurface> PaintingSurface::wrap_bitmap(Bitmap& bitmap)
}
#ifdef AK_OS_MACOS
NonnullRefPtr<PaintingSurface> PaintingSurface::wrap_iosurface(Core::IOSurfaceHandle const& iosurface_handle, RefPtr<SkiaBackendContext> context)
NonnullRefPtr<PaintingSurface> PaintingSurface::wrap_iosurface(Core::IOSurfaceHandle const& iosurface_handle, RefPtr<SkiaBackendContext> context, Origin origin)
{
auto metal_texture = context->metal_context().create_texture_from_iosurface(iosurface_handle);
IntSize const size { metal_texture->width(), metal_texture->height() };
@ -64,7 +64,18 @@ NonnullRefPtr<PaintingSurface> PaintingSurface::wrap_iosurface(Core::IOSurfaceHa
GrMtlTextureInfo mtl_info;
mtl_info.fTexture = sk_ret_cfp(metal_texture->texture());
auto backend_render_target = GrBackendRenderTargets::MakeMtl(metal_texture->width(), metal_texture->height(), mtl_info);
auto surface = SkSurfaces::WrapBackendRenderTarget(context->sk_context(), backend_render_target, kTopLeft_GrSurfaceOrigin, kBGRA_8888_SkColorType, nullptr, nullptr);
GrSurfaceOrigin sk_origin;
switch (origin) {
case Origin::TopLeft:
sk_origin = kTopLeft_GrSurfaceOrigin;
break;
case Origin::BottomLeft:
sk_origin = kBottomLeft_GrSurfaceOrigin;
break;
default:
VERIFY_NOT_REACHED();
}
auto surface = SkSurfaces::WrapBackendRenderTarget(context->sk_context(), backend_render_target, sk_origin, kBGRA_8888_SkColorType, nullptr, nullptr);
return adopt_ref(*new PaintingSurface(make<Impl>(size, surface, nullptr, context)));
}
#endif

11
Libraries/LibGfx/PaintingSurface.h
View file

@ -24,11 +24,16 @@ namespace Gfx {
class PaintingSurface : public RefCounted<PaintingSurface> {
public:
enum class Origin {
TopLeft,
BottomLeft,
};
static NonnullRefPtr<PaintingSurface> create_with_size(RefPtr<SkiaBackendContext> context, Gfx::IntSize size, Gfx::BitmapFormat color_type, Gfx::AlphaType alpha_type);
static NonnullRefPtr<PaintingSurface> wrap_bitmap(Bitmap&);
#ifdef AK_OS_MACOS
static NonnullRefPtr<PaintingSurface> wrap_iosurface(Core::IOSurfaceHandle const&, RefPtr<SkiaBackendContext>);
static NonnullRefPtr<PaintingSurface> wrap_iosurface(Core::IOSurfaceHandle const&, RefPtr<SkiaBackendContext>, Origin = Origin::TopLeft);
#endif
void read_into_bitmap(Bitmap&);
@ -47,9 +52,6 @@ public:
void flush() const;
bool flip_vertically() const { return m_flip_vertically; }
void set_flip_vertically() { m_flip_vertically = true; }
~PaintingSurface();
private:
@ -58,7 +60,6 @@ private:
PaintingSurface(NonnullOwnPtr<Impl>&&);
NonnullOwnPtr<Impl> m_impl;
bool m_flip_vertically { false };
};
}

10
Libraries/LibWeb/Painting/DisplayListPlayerSkia.cpp
View file

@ -152,17 +152,7 @@ void DisplayListPlayerSkia::draw_painting_surface(DrawPaintingSurface const& com
auto& canvas = surface().canvas();
auto image = sk_surface.makeImageSnapshot();
SkPaint paint;
if (command.surface->flip_vertically()) {
canvas.save();
SkMatrix matrix;
matrix.setIdentity();
matrix.preScale(1, -1, dst_rect.centerX(), dst_rect.centerY());
canvas.concat(matrix);
}
canvas.drawImageRect(image, src_rect, dst_rect, to_skia_sampling_options(command.scaling_mode), &paint, SkCanvas::kStrict_SrcRectConstraint);
if (command.surface->flip_vertically()) {
canvas.restore();
}
}
void DisplayListPlayerSkia::draw_scaled_immutable_bitmap(DrawScaledImmutableBitmap const& command)

3
Libraries/LibWeb/WebGL/OpenGLContext.cpp
View file

@ -126,8 +126,7 @@ void OpenGLContext::allocate_painting_surface_if_needed()
VERIFY(!m_size.is_empty());
auto iosurface = Core::IOSurfaceHandle::create(m_size.width(), m_size.height());
m_painting_surface = Gfx::PaintingSurface::wrap_iosurface(iosurface, m_skia_backend_context);
m_painting_surface->set_flip_vertically();
m_painting_surface = Gfx::PaintingSurface::wrap_iosurface(iosurface, m_skia_backend_context, Gfx::PaintingSurface::Origin::BottomLeft);
auto width = m_size.width();
auto height = m_size.height();