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LibWeb: Flush 2D canvas transformation matrix after making changes to it

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Andreas Kling 2024-08-15 07:21:24 +02:00 • committed by Andreas Kling
commit feae36f218
Notes: github-actions[bot] 2024-08-20 07:37:41 +00:00
1 changed files with 12 additions and 5 deletions
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17
Userland/Libraries/LibWeb/HTML/Canvas/CanvasTransform.h
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@ -26,18 +26,21 @@ public:
dbgln_if(CANVAS_RENDERING_CONTEXT_2D_DEBUG, "CanvasTransform::scale({}, {})", sx, sy);
my_drawing_state().transform.scale(sx, sy);
flush_transform();
}
void translate(float tx, float ty)
{
dbgln_if(CANVAS_RENDERING_CONTEXT_2D_DEBUG, "CanvasTransform::translate({}, {})", tx, ty);
my_drawing_state().transform.translate(tx, ty);
flush_transform();
}
void rotate(float radians)
{
dbgln_if(CANVAS_RENDERING_CONTEXT_2D_DEBUG, "CanvasTransform::rotate({})", radians);
my_drawing_state().transform.rotate_radians(radians);
flush_transform();
}
// https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-transform
@ -52,6 +55,7 @@ public:
// b d f
// 0 0 1
my_drawing_state().transform.multiply({ static_cast<float>(a), static_cast<float>(b), static_cast<float>(c), static_cast<float>(d), static_cast<float>(e), static_cast<float>(f) });
flush_transform();
}
// https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-gettransform
@ -72,8 +76,7 @@ public:
// 2. Reset the current transformation matrix to the identity matrix.
my_drawing_state().transform = {};
if (auto* painter = static_cast<IncludingClass&>(*this).painter())
painter->set_transform({});
flush_transform();
// 3. Invoke the transform(a, b, c, d, e, f) method with the same arguments.
transform(a, b, c, d, e, f);
@ -93,8 +96,7 @@ public:
// 3. Reset the current transformation matrix to matrix.
auto transform = Gfx::AffineTransform { static_cast<float>(matrix->a()), static_cast<float>(matrix->b()), static_cast<float>(matrix->c()), static_cast<float>(matrix->d()), static_cast<float>(matrix->e()), static_cast<float>(matrix->f()) };
my_drawing_state().transform = transform;
if (auto* painter = static_cast<IncludingClass&>(*this).painter())
painter->set_transform(transform);
flush_transform();
return {};
}
@ -103,8 +105,13 @@ public:
{
// The resetTransform() method, when invoked, must reset the current transformation matrix to the identity matrix.
my_drawing_state().transform = {};
flush_transform();
}
void flush_transform()
{
if (auto* painter = static_cast<IncludingClass&>(*this).painter())
painter->set_transform({});
painter->set_transform(my_drawing_state().transform);
}
protected: