Add debug package

debug/debug.go

@@ -0,0 +1,28 @@
+package debug
+
+import "image/draw"
+import "image/color"
+import "golang.org/x/image/math/fixed"
+import "git.tebibyte.media/tomo/typeset"
+import "git.tebibyte.media/tomo/typeset/internal"
+
+// DrawBounds draws the LayoutBounds, MinimumSize, and LayoutBoundsSpace of a
+// TypeSetter to the given image using these colors:
+//   - Red:   LayoutBounds
+//   - Green: MinimumSize
+//   - Blue:  LayoutBoundsSpace
+func DrawBounds (destination draw.Image, setter *typeset.TypeSetter, offset fixed.Point26_6) {
+	blue  := color.RGBA { B: 255, A: 255 }
+	red   := color.RGBA { R: 255, A: 255 }
+	green := color.RGBA { G: 255, A: 255 }
+
+	layoutBoundsSpace := setter.LayoutBoundsSpace()
+	layoutBounds      := setter.LayoutBounds()
+	
+	minimum     := setter.MinimumSize()
+	minimumRect := internal.RoundRect(fixed.Rectangle26_6 { Max: minimum }.Add(offset).Add(layoutBounds.Min))
+	internal.DrawRectangleOutline(destination, minimumRect, green)
+	
+	internal.DrawRectangleOutline(destination, internal.RoundRect(layoutBoundsSpace.Add(offset)), blue)
+	internal.DrawRectangleOutline(destination, internal.RoundRect(layoutBounds.Add(offset)), red)
+}