ebiten: take performance profile to consider adding DrawImageOptions.DstRegion and/or DrawImageOptions.SrcRegions

[hajimehoshi]

Operating System

• Windows
• macOS
• Linux
• FreeBSD
• OpenBSD
• Android
• iOS
• Nintendo Switch
• PlayStation 5
• Xbox
• Web Browsers

What feature would you like to be added?

See also #2945

We know that (*ebiten.Image).SubImage has some performance penalty: this returns an interface type image.Image and always allocates a heap object. If we change this to return an *ebiten.Image directly, the situation might change. However, even if this returned *ebiten.Image, this still might have a performance penalty as this still creates a new object. What about adding options to specify regions for a source and a destination image when redering an image? Before we introduce this, we need to take performance profile.

This issue is just for taking a profile. If we decide to make new APIs, let's file another issue.

Why is this needed?

To mitigate performance penalty of SubImage.