diff options
Diffstat (limited to 'ui/iconprovider.go')
| -rw-r--r-- | ui/iconprovider.go | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/ui/iconprovider.go b/ui/iconprovider.go index e5177ac3..c4daa61e 100644 --- a/ui/iconprovider.go +++ b/ui/iconprovider.go @@ -84,6 +84,45 @@ func iconForState(state manager.TunnelState, size int) (icon *walk.Icon, err err return } +var cachedBitmapsForWidthAndState = make(map[widthAndState]*walk.Bitmap) + +func bitmapForState(state manager.TunnelState, iconSize, margin, dpi int) (bitmap *walk.Bitmap, err error) { + icon, err := iconForState(state, iconSize) + if err != nil { + return + } + + bitmapSize := walk.IntFrom96DPI(iconSize+margin*2, dpi) + + cacheKey := widthAndState{bitmapSize, state} + if cacheValue, ok := cachedBitmapsForWidthAndState[cacheKey]; ok { + bitmap = cacheValue + return + } + + bitmap, err = walk.NewBitmapWithTransparentPixelsForDPI(walk.Size{bitmapSize, bitmapSize}, dpi) + if err != nil { + return + } + + var canvas *walk.Canvas + canvas, err = walk.NewCanvasFromImage(bitmap) + if err != nil { + return + } + + bounds := walk.Rectangle{X: margin, Y: margin, Height: iconSize, Width: iconSize} + err = canvas.DrawImageStretchedPixels(icon, bounds) + canvas.Dispose() + if err != nil { + return + } + + cachedBitmapsForWidthAndState[cacheKey] = bitmap + + return +} + func textForState(state manager.TunnelState, withEllipsis bool) (text string) { switch state { case manager.TunnelStarted: |