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restorable: Move 'putting random-colored dot' to restorable
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@ -72,6 +72,20 @@ type Image struct {
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screen bool
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}
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type rand struct {
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x, y, z, w uint32
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}
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func (r *rand) next() uint32 {
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// Xorshift: http://en.wikipedia.org/wiki/Xorshift
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t := r.x ^ (r.x << 11)
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r.x, r.y, r.z = r.y, r.z, r.w
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r.w = (r.w ^ (r.w >> 19)) ^ (t ^ (t >> 8))
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return r.w
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}
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var theRand = &rand{12345678, 4185243, 776511, 45411}
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// NewImage creates an empty image with the given size.
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func NewImage(width, height int, volatile bool) *Image {
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i := &Image{
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@ -80,6 +94,17 @@ func NewImage(width, height int, volatile bool) *Image {
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}
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theImages.add(i)
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runtime.SetFinalizer(i, (*Image).Dispose)
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// Put a random color pixel on newImg to make tests reliable
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// (e.g. shareable_test.TestEnsureNotShared. This test might pass
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// without this ReplacePixels even when the next DrawImage has a bug).
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// This avoids to use remaining GPU memory state unexpectedly.
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//
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// TODO: Is it better clearing the image? How about the cost?
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v := theRand.next()
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r, g, b := uint8(v>>24), uint8(v>>16), uint8(v>>8)
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i.ReplacePixels([]byte{r, g, b, 0xff}, 0, 0, 1, 1)
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return i
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}
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@ -87,20 +87,6 @@ type Image struct {
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node *packing.Node
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}
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type rand struct {
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x, y, z, w uint32
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}
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func (r *rand) next() uint32 {
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// Xorshift: http://en.wikipedia.org/wiki/Xorshift
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t := r.x ^ (r.x << 11)
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r.x, r.y, r.z = r.y, r.z, r.w
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r.w = (r.w ^ (r.w >> 19)) ^ (t ^ (t >> 8))
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return r.w
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}
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var theRand = &rand{12345678, 4185243, 776511, 45411}
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func (s *Image) ensureNotShared() {
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if s.node == nil {
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return
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@ -108,16 +94,6 @@ func (s *Image) ensureNotShared() {
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x, y, w, h := s.region()
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newImg := restorable.NewImage(w, h, false)
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// Put a random color pixel on newImg to make tests reliable.
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//
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// Of course this function works without this ReplacePixels,
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// but the tests might pass without this even if there is a bug
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// in DrawImage because of previous GPU memory state.
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v := theRand.next()
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r, g, b := uint8(v>>24), uint8(v>>16), uint8(v>>8)
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newImg.ReplacePixels([]byte{r, g, b, 0xff}, 0, 0, 1, 1)
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newImg.DrawImage(s.backend.restorable, x, y, x+w, y+h, nil, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
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s.dispose()
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