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https://git.sr.ht/~eliasnaur/gio
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Viktor
b247395c62
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>
60 lines
1.5 KiB
Go
60 lines
1.5 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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package ops
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import (
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"encoding/binary"
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"math"
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"gioui.org/f32"
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"gioui.org/internal/opconst"
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)
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const QuadSize = 4 * 2 * 3
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type Quad struct {
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From, Ctrl, To f32.Point
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}
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func EncodeQuad(d []byte, q Quad) {
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bo := binary.LittleEndian
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bo.PutUint32(d[0:], math.Float32bits(q.From.X))
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bo.PutUint32(d[4:], math.Float32bits(q.From.Y))
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bo.PutUint32(d[8:], math.Float32bits(q.Ctrl.X))
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bo.PutUint32(d[12:], math.Float32bits(q.Ctrl.Y))
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bo.PutUint32(d[16:], math.Float32bits(q.To.X))
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bo.PutUint32(d[20:], math.Float32bits(q.To.Y))
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}
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func DecodeQuad(d []byte) (q Quad) {
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bo := binary.LittleEndian
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q.From.X = math.Float32frombits(bo.Uint32(d[0:]))
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q.From.Y = math.Float32frombits(bo.Uint32(d[4:]))
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q.Ctrl.X = math.Float32frombits(bo.Uint32(d[8:]))
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q.Ctrl.Y = math.Float32frombits(bo.Uint32(d[12:]))
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q.To.X = math.Float32frombits(bo.Uint32(d[16:]))
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q.To.Y = math.Float32frombits(bo.Uint32(d[20:]))
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return
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}
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func DecodeTransform(d []byte) (t f32.Affine2D) {
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if opconst.OpType(d[0]) != opconst.TypeTransform {
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panic("invalid op")
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}
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if len(d) < 1+6*4 {
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panic("too short buffer")
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}
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return decodeAffine2D(d[1:])
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}
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func decodeAffine2D(data []byte) f32.Affine2D {
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bo := binary.LittleEndian
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a := math.Float32frombits(bo.Uint32(data))
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b := math.Float32frombits(bo.Uint32(data[4*1:]))
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c := math.Float32frombits(bo.Uint32(data[4*2:]))
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d := math.Float32frombits(bo.Uint32(data[4*3:]))
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e := math.Float32frombits(bo.Uint32(data[4*4:]))
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f := math.Float32frombits(bo.Uint32(data[4*5:]))
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return f32.NewAffine2D(a, b, c, d, e, f)
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}
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