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LibGfx: Add fast path for multiply() with identity transforms

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This is a no-op, and exiting early is useful as it cuts time spent in
AffineTransform::multiply() from 3% to 2% when hovering links on
ziglang.org.
This commit is contained in:
Andreas Kling 2024-03-02 10:48:15 +01:00
parent e46deec846
commit c69b266e43
Notes: sideshowbarker 2024-07-17 02:56:25 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/c69b266e43
Pull-request: https://github.com/SerenityOS/serenity/pull/23423
1 changed files with 2 additions and 0 deletions
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2
Userland/Libraries/LibGfx/AffineTransform.cpp
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@ -108,6 +108,8 @@ AffineTransform& AffineTransform::set_translation(FloatPoint t)
AffineTransform& AffineTransform::multiply(AffineTransform const& other)
{
if (other.is_identity())
return *this;
AffineTransform result;
result.m_values[0] = other.a() * a() + other.b() * c();
result.m_values[1] = other.a() * b() + other.b() * d();