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graphics: Update comments about makeVolatile

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Hajime Hoshi 2019-02-13 09:47:30 +09:00
parent 83da4ea112
commit ef31a6bb21
1 changed files with 4 additions and 4 deletions
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8
image.go
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@ -733,10 +733,10 @@ func NewImage(width, height int, filter Filter) (*Image, error) {
//
// This is suitable for offscreen images that pixels are changed often.
//
// Pixels in regular non-volatile images are saved at each end of a frame if the image
// is changed, and restored automatically from the saved pixels on context lost.
// On the other hand, pixels in volatile images are not saved.
// Saving pixels is an expensive operation, and it is desirable to avoid it if possible.
// Regular non-volatile images need to record drawing history or read its pixels from GPU if necessary so that all
// the images can be restored automatically from the context lost. However, such recording the drawing history or
// reading pixels from GPU are expensive operations. Volatile images can skip such oprations, but the image content
// is cleared every frame instead.
//
// When the image is disposed, makeVolatile does nothing.
func (i *Image) makeVolatile() {