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f32: replace Affine2D{} with AffineId() for identity transformations

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Reduces ambiguity by introducing AffineId() for representing identity transformation matrices.

References: https://todo.sr.ht/~eliasnaur/gio/655
Signed-off-by: Walter Werner SCHNEIDER <contact@schnwalter.eu>
This commit is contained in:
Walter Werner SCHNEIDER
2025-07-09 13:38:17 +03:00
committed by Elias Naur
parent 3e601e73c4
commit d76b4272aa
15 changed files with 49 additions and 35 deletions
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gpu/gpu.go
+3 -3
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@@ -872,7 +872,7 @@ func (r *renderer) drawLayers(layers []opacityLayer, ops []imageOp) {
r.drawOps(true, l.clip.Min.Mul(-1), l.clip.Size(), ops[l.opStart:l.opEnd])
sr := f32.FRect(v)
uvScale, uvOffset := texSpaceTransform(sr, f.size)
uvTrans := f32.Affine2D{}.Scale(f32.Point{}, uvScale).Offset(uvOffset)
uvTrans := f32.AffineId().Scale(f32.Point{}, uvScale).Offset(uvOffset)
// Replace layer ops with one textured op.
ops[l.opStart] = imageOp{
clip: l.clip,
@@ -1196,7 +1196,7 @@ func (d *drawState) materialFor(rect f32.Rectangle, off f32.Point, partTrans f32
sr.Min.Y += float32(clip.Min.Y-dr.Min.Y) * sdy / dy
sr.Max.Y -= float32(dr.Max.Y-clip.Max.Y) * sdy / dy
uvScale, uvOffset := texSpaceTransform(sr, sz)
m.uvTrans = partTrans.Mul(f32.Affine2D{}.Scale(f32.Point{}, uvScale).Offset(uvOffset))
m.uvTrans = partTrans.Mul(f32.AffineId().Scale(f32.Point{}, uvScale).Offset(uvOffset))
m.data = d.image
}
return m
@@ -1371,7 +1371,7 @@ func gradientSpaceTransform(clip image.Rectangle, off f32.Point, stop1, stop2 f3
// TODO: optimize
zp := f32.Point{}
return f32.Affine2D{}.
return f32.AffineId().
Scale(zp, layout.FPt(clip.Size())). // scale to pixel space
Offset(zp.Sub(off).Add(layout.FPt(clip.Min))). // offset to clip space
Offset(zp.Sub(stop1)). // offset to first stop point