add more tests

assetbake/opaque_bounds_test.odin

@@ -0,0 +1,46 @@
+package main
+
+import "core:testing"
+
+@(test)
+opaque_bounds_inset :: proc(t: ^testing.T) {
+	// 4x4, opaque 2x2 at (1,1)
+	pixels := make([]u8, 4 * 4 * 4)
+	defer delete(pixels)
+	for y in 1 ..= 2 {
+		for x in 1 ..= 2 {
+			i := (y * 4 + x) * 4
+			pixels[i + 3] = 255
+		}
+	}
+	x, y, w, h := opaque_bounds_rgba(pixels, 4, 4)
+	testing.expect_value(t, x, 1)
+	testing.expect_value(t, y, 1)
+	testing.expect_value(t, w, 2)
+	testing.expect_value(t, h, 2)
+}
+
+@(test)
+opaque_bounds_full :: proc(t: ^testing.T) {
+	pixels := make([]u8, 2 * 2 * 4)
+	defer delete(pixels)
+	for i := 3; i < len(pixels); i += 4 {
+		pixels[i] = 255
+	}
+	x, y, w, h := opaque_bounds_rgba(pixels, 2, 2)
+	testing.expect_value(t, x, 0)
+	testing.expect_value(t, y, 0)
+	testing.expect_value(t, w, 2)
+	testing.expect_value(t, h, 2)
+}
+
+@(test)
+opaque_bounds_empty :: proc(t: ^testing.T) {
+	pixels := make([]u8, 3 * 3 * 4)
+	defer delete(pixels)
+	x, y, w, h := opaque_bounds_rgba(pixels, 3, 3)
+	testing.expect_value(t, x, 0)
+	testing.expect_value(t, y, 0)
+	testing.expect_value(t, w, 1)
+	testing.expect_value(t, h, 1)
+}