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LibWeb: Make CSS Transformation struct a proper class

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Move it out of ComputedValues.h into its own files, and take the
transformation-to-matrix code from StackingContext.
This commit is contained in:
Sam Atkins 2023-10-13 17:25:23 +01:00 • committed by Andreas Kling
parent 3c49d0dad3
commit 642ad80960
8 changed files with 193 additions and 152 deletions
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140
Userland/Libraries/LibWeb/Painting/StackingContext.cpp
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@ -270,150 +270,12 @@ void StackingContext::paint_internal(PaintContext& context) const
paint_descendants(context, paintable_box(), StackingContextPaintPhase::FocusAndOverlay);
}
Gfx::FloatMatrix4x4 StackingContext::get_transformation_matrix(CSS::Transformation const& transformation) const
{
auto count = transformation.values.size();
auto value = [this, transformation](size_t index, CSS::Length const& reference_length = CSS::Length::make_px(0)) -> float {
return transformation.values[index].visit(
[this, reference_length](CSS::LengthPercentage const& value) -> double {
return value.resolved(paintable_box().layout_node(), reference_length).to_px(paintable_box().layout_box()).to_float();
},
[this](CSS::AngleOrCalculated const& value) {
return value.resolved(paintable_box().layout_node()).to_degrees() * M_DEG2RAD;
},
[](double value) {
return value;
});
};
auto reference_box = paintable_box().absolute_rect();
auto width = CSS::Length::make_px(reference_box.width());
auto height = CSS::Length::make_px(reference_box.height());
switch (transformation.function) {
case CSS::TransformFunction::Matrix:
if (count == 6)
return Gfx::FloatMatrix4x4(value(0), value(2), 0, value(4),
value(1), value(3), 0, value(5),
0, 0, 1, 0,
0, 0, 0, 1);
break;
case CSS::TransformFunction::Matrix3d:
if (count == 16)
return Gfx::FloatMatrix4x4(value(0), value(4), value(8), value(12),
value(1), value(5), value(9), value(13),
value(2), value(6), value(10), value(14),
value(3), value(7), value(11), value(15));
break;
case CSS::TransformFunction::Translate:
if (count == 1)
return Gfx::FloatMatrix4x4(1, 0, 0, value(0, width),
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1);
if (count == 2)
return Gfx::FloatMatrix4x4(1, 0, 0, value(0, width),
0, 1, 0, value(1, height),
0, 0, 1, 0,
0, 0, 0, 1);
break;
case CSS::TransformFunction::Translate3d:
return Gfx::FloatMatrix4x4(1, 0, 0, value(0, width),
0, 1, 0, value(1, height),
0, 0, 1, value(2),
0, 0, 0, 1);
break;
case CSS::TransformFunction::TranslateX:
if (count == 1)
return Gfx::FloatMatrix4x4(1, 0, 0, value(0, width),
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1);
break;
case CSS::TransformFunction::TranslateY:
if (count == 1)
return Gfx::FloatMatrix4x4(1, 0, 0, 0,
0, 1, 0, value(0, height),
0, 0, 1, 0,
0, 0, 0, 1);
break;
case CSS::TransformFunction::Scale:
if (count == 1)
return Gfx::FloatMatrix4x4(value(0), 0, 0, 0,
0, value(0), 0, 0,
0, 0, 1, 0,
0, 0, 0, 1);
if (count == 2)
return Gfx::FloatMatrix4x4(value(0), 0, 0, 0,
0, value(1), 0, 0,
0, 0, 1, 0,
0, 0, 0, 1);
break;
case CSS::TransformFunction::ScaleX:
if (count == 1)
return Gfx::FloatMatrix4x4(value(0), 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1);
break;
case CSS::TransformFunction::ScaleY:
if (count == 1)
return Gfx::FloatMatrix4x4(1, 0, 0, 0,
0, value(0), 0, 0,
0, 0, 1, 0,
0, 0, 0, 1);
break;
case CSS::TransformFunction::RotateX:
if (count == 1)
return Gfx::rotation_matrix({ 1.0f, 0.0f, 0.0f }, value(0));
break;
case CSS::TransformFunction::RotateY:
if (count == 1)
return Gfx::rotation_matrix({ 0.0f, 1.0f, 0.0f }, value(0));
break;
case CSS::TransformFunction::Rotate:
case CSS::TransformFunction::RotateZ:
if (count == 1)
return Gfx::rotation_matrix({ 0.0f, 0.0f, 1.0f }, value(0));
break;
case CSS::TransformFunction::Skew:
if (count == 1)
return Gfx::FloatMatrix4x4(1, tanf(value(0)), 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1);
if (count == 2)
return Gfx::FloatMatrix4x4(1, tanf(value(0)), 0, 0,
tanf(value(1)), 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1);
break;
case CSS::TransformFunction::SkewX:
if (count == 1)
return Gfx::FloatMatrix4x4(1, tanf(value(0)), 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1);
break;
case CSS::TransformFunction::SkewY:
if (count == 1)
return Gfx::FloatMatrix4x4(1, 0, 0, 0,
tanf(value(0)), 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1);
break;
default:
dbgln_if(LIBWEB_CSS_DEBUG, "FIXME: Unhandled transformation function {}", CSS::TransformationStyleValue::create(transformation.function, {})->to_string());
}
return Gfx::FloatMatrix4x4::identity();
}
Gfx::FloatMatrix4x4 StackingContext::combine_transformations(Vector<CSS::Transformation> const& transformations) const
{
auto matrix = Gfx::FloatMatrix4x4::identity();
for (auto const& transform : transformations)
matrix = matrix * get_transformation_matrix(transform);
matrix = matrix * transform.to_matrix(paintable_box());
return matrix;
}