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LibGfx: Add AffineTransform::is_identity_or_translation()

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This will allow us to implement fast paths in cases where a simple
translation can be handled faster than a full affine transform.
This commit is contained in:
Andreas Kling 2022-04-10 18:40:26 +02:00
parent adc92beed1
commit b4c3882d9c
Notes: sideshowbarker 2024-07-17 12:08:04 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/b4c3882d9c
2 changed files with 6 additions and 0 deletions
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5
Userland/Libraries/LibGfx/AffineTransform.cpp
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@ -16,6 +16,11 @@ bool AffineTransform::is_identity() const
return m_values[0] == 1 && m_values[1] == 0 && m_values[2] == 0 && m_values[3] == 1 && m_values[4] == 0 && m_values[5] == 0;
}
bool AffineTransform::is_identity_or_translation() const
{
return a() == 1 && b() == 0 && c() == 0 && d() == 1;
}
static float hypotenuse(float x, float y)
{
// FIXME: This won't handle overflow :(

1
Userland/Libraries/LibGfx/AffineTransform.h
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@ -25,6 +25,7 @@ public:
}
bool is_identity() const;
bool is_identity_or_translation() const;
void map(float unmapped_x, float unmapped_y, float& mapped_x, float& mapped_y) const;