image: minor tweaks

- make init methods return Image(T) instead of Self to help ZLS
- remove unneeded pointers

examples/src/face_alignment.zig

@@ -94,7 +94,7 @@ pub fn extractAlignedFace(
     // Resize it to the desired size.
     var resized = try Image(Rgba).initAlloc(allocator, out.rows, out.cols);
     defer resized.deinit(allocator);
-    chip.resize(&resized);
+    chip.resize(resized);
     for (out.data, resized.data) |*c, b| {
         c.* = b;
     }

src/image.zig

@@ -19,11 +19,11 @@ pub fn Image(comptime T: type) type {
         const Self = @This();
         /// Constructs an image of rows and cols size.  If the slice is owned by this image,
         /// deinit should also be called.
-        pub fn init(rows: usize, cols: usize, data: []T) Self {
+        pub fn init(rows: usize, cols: usize, data: []T) Image(T) {
             return .{ .rows = rows, .cols = cols, .data = data };
         }
 
-        pub fn initAlloc(allocator: std.mem.Allocator, rows: usize, cols: usize) !Self {
+        pub fn initAlloc(allocator: std.mem.Allocator, rows: usize, cols: usize) !Image(T) {
             var array = std.ArrayList(T).init(allocator);
             try array.resize(rows * cols);
             return .{ .rows = rows, .cols = cols, .data = try array.toOwnedSlice() };
@@ -117,7 +117,7 @@ pub fn Image(comptime T: type) type {
         }
 
         /// Resizes an image to fit in out, using bilinear interpolation.
-        pub fn resize(self: Self, out: *Self) void {
+        pub fn resize(self: Self, out: Self) void {
             const x_scale: f32 = as(f32, self.cols - 1) / as(f32, @max(out.cols - 1, 1));
             const y_scale: f32 = as(f32, self.rows - 1) / as(f32, @max(out.rows - 1, 1));
             var sy: f32 = -y_scale;