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feature request: allow easily saving and restoring state

3

Idea suggested by @kettek, mimicking html canvas `save()` and `restore()` methods. Here's an API prototype: ```Golang // Registers a new restore point for the renderer's state. You can jump //...

tinne26

Panic when drawing off the edge of an offscreen image

3

``` panic: runtime error: index out of range [28] with length 28 goroutine 10 [running]: golang.org/x/image/vector.(*Rasterizer).rasterizeDstAlphaSrcOpaqueOpSrc(0x1400016cab0, 0x140010f9200, {{0x14000f715f8?, 0x100a74078?}, {0x14000f715f8?, 0x100a74018?}}) /Users/kalexmills/go/pkg/mod/golang.org/x/[email protected]/vector/vector.go:384 +0x1b4 golang.org/x/image/vector.(*Rasterizer).Draw(0x1400016cab0, {0x1012f21b8?, 0x140010f9200}, {{0x24?, 0x0?}, {0x0?, 0x0?}},...

kalexmills