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LibGfx: Add fast paths for identity/translate-only transforms

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This shrinks time spent in AffineTransform::map() from 3.3% to 1.6%
when hovering links on ziglang.org.
This commit is contained in:
Andreas Kling 2024-03-02 09:55:30 +01:00
parent 20ff69cd41
commit 2dacd1252c
1 changed files with 11 additions and 0 deletions
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11
Userland/Libraries/LibGfx/AffineTransform.cpp
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@ -89,6 +89,11 @@ AffineTransform& AffineTransform::skew_radians(float x_radians, float y_radians)
AffineTransform& AffineTransform::translate(float tx, float ty)
{
if (is_identity_or_translation()) {
m_values[4] += tx;
m_values[5] += ty;
return *this;
}
m_values[4] += tx * m_values[0] + ty * m_values[2];
m_values[5] += tx * m_values[1] + ty * m_values[3];
return *this;
@ -208,6 +213,12 @@ static T largest_of(T p1, T p2, T p3, T p4)
template<>
FloatRect AffineTransform::map(FloatRect const& rect) const
{
if (is_identity()) {
return rect;
}
if (is_identity_or_translation()) {
return rect.translated(e(), f());
}
FloatPoint p1 = map(rect.top_left());
FloatPoint p2 = map(rect.top_right());
FloatPoint p3 = map(rect.bottom_right());