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restorable: Lock At operation between frames

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Updates #913
This commit is contained in:
Hajime Hoshi 2019-08-12 16:54:15 +09:00
parent d2719188b4
commit 1156dfdc7e
1 changed files with 5 additions and 2 deletions
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7
internal/restorable/image.go
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@ -444,8 +444,11 @@ func (i *Image) readPixelsFromGPUIfNeeded() {
//
// Note that this must not be called until context is available.
func (i *Image) At(x, y int) (byte, byte, byte, byte) {
// As this should not affect the information for restoring, this doesn't have to be deferred.
// TODO: If there are deferred operations, At doesn't return the correct color. Fix this (#913).
// As At can be affected by deferred functions, and At itself cannot be deferred, lock this operation.
theImages.deferCh <- struct{}{}
defer func() {
<-theImages.deferCh
}()
w, h := i.image.Size()
if x < 0 || y < 0 || w <= x || h <= y {