joejulian/gio
1
0
Fork 1
mirror of https://git.sr.ht/~eliasnaur/gio synced 2026-07-06 09:55:40 +00:00
Code Issues Packages Projects Releases Wiki Activity

gpu, io/router, op: use f32.Affine2D instead of op.TransformOp for transforms

Browse Source 
Encode TransformOp as an Affince2D matrix instead and use that in gpu and io transform handling.
There are no changes to user facing API and so far only the offset part of the matrix is used.

This patch is a step towards full affine transformations.

Signed-off-by: Viktor <viktor.ogeman@gmail.com>
This commit is contained in:
Viktor
2020-06-20 23:29:50 +02:00
committed by Elias Naur
parent e7bc1a4553
commit b247395c62
5 changed files with 32 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files
internal/ops/ops.go
+16 -7
View File
@@ -8,7 +8,6 @@ import (
"gioui.org/f32"
"gioui.org/internal/opconst"
"gioui.org/op"
)
const QuadSize = 4 * 2 * 3
@@ -38,13 +37,23 @@ func DecodeQuad(d []byte) (q Quad) {
return
}
func DecodeTransformOp(d []byte) op.TransformOp {
bo := binary.LittleEndian
func DecodeTransform(d []byte) (t f32.Affine2D) {
if opconst.OpType(d[0]) != opconst.TypeTransform {
panic("invalid op")
}
return op.TransformOp{}.Offset(f32.Point{
X: math.Float32frombits(bo.Uint32(d[1:])),
Y: math.Float32frombits(bo.Uint32(d[5:])),
})
if len(d) < 1+6*4 {
panic("too short buffer")
}
return decodeAffine2D(d[1:])
}
func decodeAffine2D(data []byte) f32.Affine2D {
bo := binary.LittleEndian
a := math.Float32frombits(bo.Uint32(data))
b := math.Float32frombits(bo.Uint32(data[4*1:]))
c := math.Float32frombits(bo.Uint32(data[4*2:]))
d := math.Float32frombits(bo.Uint32(data[4*3:]))
e := math.Float32frombits(bo.Uint32(data[4*4:]))
f := math.Float32frombits(bo.Uint32(data[4*5:]))
return f32.NewAffine2D(a, b, c, d, e, f)
}