gpu,internal/ops: move gpu.clipOp to ops.ClipOp

We're about to use clip.Ops for pointer areas; this change makes the
decoding accessible from the router package.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

gpu/compute.go

@@ -1772,9 +1772,10 @@ func (c *collector) collect(root *op.Ops, viewport image.Point, texOps *[]textur
 			pathData.key = encOp.Key
 			pathData.hash = hash
 		case ops.TypeClip:
-			var op clipOp
-			op.decode(encOp.Data)
-			c.addClip(&state, fview, op.bounds, pathData.data, pathData.key, pathData.hash, strWidth, true)
+			var op ops.ClipOp
+			op.Decode(encOp.Data)
+			bounds := layout.FRect(op.Bounds)
+			c.addClip(&state, fview, bounds, pathData.data, pathData.key, pathData.hash, strWidth, true)
 			pathData.data = nil
 			strWidth = 0
 		case ops.TypePopClip:

gpu/gpu.go

@@ -165,13 +165,6 @@ type material struct {
 	uvTrans f32.Affine2D
 }
 
-// clipOp is the shadow of clip.Op.
-type clipOp struct {
-	// TODO: Use image.Rectangle?
-	bounds  f32.Rectangle
-	outline bool
-}
-
 // imageOpData is the shadow of paint.ImageOp.
 type imageOpData struct {
 	src    *image.RGBA
@@ -185,27 +178,6 @@ type linearGradientOpData struct {
 	color2 color.NRGBA
 }
 
-func (op *clipOp) decode(data []byte) {
-	if ops.OpType(data[0]) != ops.TypeClip {
-		panic("invalid op")
-	}
-	bo := binary.LittleEndian
-	r := image.Rectangle{
-		Min: image.Point{
-			X: int(int32(bo.Uint32(data[1:]))),
-			Y: int(int32(bo.Uint32(data[5:]))),
-		},
-		Max: image.Point{
-			X: int(int32(bo.Uint32(data[9:]))),
-			Y: int(int32(bo.Uint32(data[13:]))),
-		},
-	}
-	*op = clipOp{
-		bounds:  layout.FRect(r),
-		outline: data[17] == 1,
-	}
-}
-
 func decodeImageOp(data []byte, refs []interface{}) imageOpData {
 	if ops.OpType(data[0]) != ops.TypeImage {
 		panic("invalid op")
@@ -937,10 +909,10 @@ loop:
 			quads.key.Key = encOp.Key
 
 		case ops.TypeClip:
-			var op clipOp
-			op.decode(encOp.Data)
-			quads.key.outline = op.outline
-			bounds := op.bounds
+			var op ops.ClipOp
+			op.Decode(encOp.Data)
+			quads.key.outline = op.Outline
+			bounds := layout.FRect(op.Bounds)
 			trans, off := splitTransform(state.t)
 			if len(quads.aux) > 0 {
 				// There is a clipping path, build the gpu data and update the
@@ -950,22 +922,22 @@ loop:
 				if v, ok := d.pathCache.get(quads.key); ok {
 					// Since the GPU data exists in the cache aux will not be used.
 					// Why is this not used for the offset shapes?
-					op.bounds = v.bounds
+					bounds = v.bounds
 				} else {
-					pathData, bounds := d.buildVerts(
+					var pathData []byte
+					pathData, bounds = d.buildVerts(
 						quads.aux, trans, quads.key.outline, quads.key.strokeWidth,
 					)
-					op.bounds = bounds
 					quads.aux = pathData
 					// add it to the cache, without GPU data, so the transform can be
 					// reused.
-					d.pathCache.put(quads.key, opCacheValue{bounds: op.bounds})
+					d.pathCache.put(quads.key, opCacheValue{bounds: bounds})
 				}
 			} else {
-				quads.aux, op.bounds, _ = d.boundsForTransformedRect(bounds, trans)
+				quads.aux, bounds, _ = d.boundsForTransformedRect(bounds, trans)
 				quads.key = opKey{Key: encOp.Key}
 			}
-			d.addClipPath(&state, quads.aux, quads.key, op.bounds, off, true)
+			d.addClipPath(&state, quads.aux, quads.key, bounds, off, true)
 			quads = quadsOp{}
 		case ops.TypePopClip:
 			state.cpath = state.cpath.parent

internal/ops/ops.go

@@ -4,6 +4,7 @@ package ops
 
 import (
 	"encoding/binary"
+	"image"
 	"math"
 
 	"gioui.org/f32"
@@ -86,6 +87,12 @@ type stack struct {
 
 type StackKind uint8
 
+// ClipOp is the shadow of clip.Op.
+type ClipOp struct {
+	Bounds  image.Rectangle
+	Outline bool
+}
+
 const (
 	ClipStack StackKind = iota
 	AreaStack
@@ -126,6 +133,27 @@ const (
 	TypeStrokeLen          = 1 + 4
 )
 
+func (op *ClipOp) Decode(data []byte) {
+	if OpType(data[0]) != TypeClip {
+		panic("invalid op")
+	}
+	bo := binary.LittleEndian
+	r := image.Rectangle{
+		Min: image.Point{
+			X: int(int32(bo.Uint32(data[1:]))),
+			Y: int(int32(bo.Uint32(data[5:]))),
+		},
+		Max: image.Point{
+			X: int(int32(bo.Uint32(data[9:]))),
+			Y: int(int32(bo.Uint32(data[13:]))),
+		},
+	}
+	*op = ClipOp{
+		Bounds:  r,
+		Outline: data[17] == 1,
+	}
+}
+
 func Reset(o *Ops) {
 	o.macroStack = stack{}
 	for i := range o.stacks {