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https://git.sr.ht/~eliasnaur/gio
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Elias Naur
eb9bf60b09
We're about to let clip.Path use more of the compute renderer features (lines, cubic béziers). This change prepares the gpu package for reading one of several commands types, not just the quadratic béziers of before. The old Quad type is still the basis for the stroking algorithms, but this change moves it into package gpu which is the only user. Signed-off-by: Elias Naur <mail@eliasnaur.com>
55 lines
1.3 KiB
Go
55 lines
1.3 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/byteslice"
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"gioui.org/internal/opconst"
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"gioui.org/internal/scene"
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)
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func DecodeCommand(d []byte) scene.Command {
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var cmd scene.Command
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copy(byteslice.Uint32(cmd[:]), d)
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return cmd
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}
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func DecodeTransform(data []byte) (t f32.Affine2D) {
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if opconst.OpType(data[0]) != opconst.TypeTransform {
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panic("invalid op")
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}
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data = data[1:]
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data = data[:4*6]
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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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// DecodeSave decodes the state id of a save op.
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func DecodeSave(data []byte) int {
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if opconst.OpType(data[0]) != opconst.TypeSave {
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panic("invalid op")
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}
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bo := binary.LittleEndian
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return int(bo.Uint32(data[1:]))
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}
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// DecodeLoad decodes the state id and mask of a load op.
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func DecodeLoad(data []byte) (int, opconst.StateMask) {
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if opconst.OpType(data[0]) != opconst.TypeLoad {
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panic("invalid op")
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}
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bo := binary.LittleEndian
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return int(bo.Uint32(data[2:])), opconst.StateMask(data[1])
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}
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