gpu: cache quad splitting and transform

Cache also CPU operations by moving pathCache into
drawOps and use it in collectOps to avoid splitting and
transformation of quads if in cache. In order to support
this use a concrete type in opCache instead of interface.

Signed-off-by: Viktor <viktor.ogeman@gmail.com>

gpu/caches.go

@@ -5,6 +5,7 @@ package gpu
 import (
 	"fmt"
 
+	"gioui.org/f32"
 	"gioui.org/internal/ops"
 )
 
@@ -13,11 +14,15 @@ type resourceCache struct {
 	newRes map[interface{}]resource
 }
 
-// opCache is like a resourceCache using the concrete Key
-// key type to avoid allocations.
+// opCache is like a resourceCache but using concrete types.
 type opCache struct {
-	res    map[ops.Key]resource
-	newRes map[ops.Key]resource
+	res    map[ops.Key]opCacheValue
+	newRes map[ops.Key]opCacheValue
+}
+
+type opCacheValue struct {
+	data   *pathData
+	bounds f32.Rectangle
 }
 
 func newResourceCache() *resourceCache {
@@ -66,12 +71,12 @@ func (r *resourceCache) release() {
 
 func newOpCache() *opCache {
 	return &opCache{
-		res:    make(map[ops.Key]resource),
-		newRes: make(map[ops.Key]resource),
+		res:    make(map[ops.Key]opCacheValue),
+		newRes: make(map[ops.Key]opCacheValue),
 	}
 }
 
-func (r *opCache) get(key ops.Key) (resource, bool) {
+func (r *opCache) get(key ops.Key) (opCacheValue, bool) {
 	v, exists := r.res[key]
 	if exists {
 		r.newRes[key] = v
@@ -79,7 +84,7 @@ func (r *opCache) get(key ops.Key) (resource, bool) {
 	return v, exists
 }
 
-func (r *opCache) put(key ops.Key, val resource) {
+func (r *opCache) put(key ops.Key, val opCacheValue) {
 	if _, exists := r.newRes[key]; exists {
 		panic(fmt.Errorf("key exists, %#v", key))
 	}
@@ -91,7 +96,7 @@ func (r *opCache) frame() {
 	for k, v := range r.res {
 		if _, exists := r.newRes[k]; !exists {
 			delete(r.res, k)
-			v.release()
+			v.data.release()
 		}
 	}
 	for k, v := range r.newRes {
@@ -102,7 +107,7 @@ func (r *opCache) frame() {
 
 func (r *opCache) release() {
 	for _, v := range r.newRes {
-		v.release()
+		v.data.release()
 	}
 	r.newRes = nil
 	r.res = nil