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graphics: Fix comments

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Hajime Hoshi 2019-02-12 14:24:22 +09:00
parent 17daf99c3c
commit b962d58097
1 changed files with 2 additions and 3 deletions
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5
image.go
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@ -68,6 +68,7 @@ func (m *mipmap) level(r image.Rectangle, level int) *shareable.Image {
} }
var s *shareable.Image var s *shareable.Image
if m.orig.IsVolatile() { if m.orig.IsVolatile() {
// TODO: As s is cleared every frame, is there any reason to keep it?
s = shareable.NewVolatileImage(w2, h2) s = shareable.NewVolatileImage(w2, h2)
} else { } else {
s = shareable.NewImage(w2, h2) s = shareable.NewImage(w2, h2)
@ -736,12 +737,10 @@ func NewImage(width, height int, filter Filter) (*Image, error) {
// This is suitable for offscreen images that pixels are changed often. // 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 // 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 GL context lost. // is changed, and restored automatically from the saved pixels on context lost.
// On the other hand, pixels in volatile images are not saved. // 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. // Saving pixels is an expensive operation, and it is desirable to avoid it if possible.
// //
// Note that volatile images are internal only and will never be source of drawing.
//
// If width or height is less than 1 or more than device-dependent maximum size, newVolatileImage panics. // If width or height is less than 1 or more than device-dependent maximum size, newVolatileImage panics.
func newVolatileImage(width, height int) *Image { func newVolatileImage(width, height int) *Image {
i := &Image{ i := &Image{