From 264c71677b8dd6877e98df76dff91e0cb56a17b1 Mon Sep 17 00:00:00 2001
From: gered <gered@blarg.ca>
Date: Sat, 21 May 2022 16:40:09 -0400
Subject: [PATCH] add helper/debug method to draw a palette to a bitmap

---
 libretrogd/src/graphics/palette.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/libretrogd/src/graphics/palette.rs b/libretrogd/src/graphics/palette.rs
index 2258f75..5c3480c 100644
--- a/libretrogd/src/graphics/palette.rs
+++ b/libretrogd/src/graphics/palette.rs
@@ -8,6 +8,7 @@ use byteorder::{ReadBytesExt, WriteBytesExt};
 use thiserror::Error;
 
 use crate::NUM_COLORS;
+use crate::graphics::*;
 use crate::utils::abs_diff;
 
 // silly "hack" (???) which allows us to alias the generic constraint `RangeBounds<u8> + Iterator<Item = u8>` to `ColorRange`
@@ -454,6 +455,20 @@ impl Palette {
 
         closest
     }
+
+    /// Debug helper that draws this palette to the given bitmap as a 16x16 pixel grid, where each
+    /// pixel is one of the colors from this palette, in ascending order, left-to-right,
+    /// top-to-bottom. The coordinates given specify the top-left coordinate on the destination
+    /// bitmap to begin drawing the palette at.
+    pub fn draw(&self, dest: &mut Bitmap, x: i32, y: i32) {
+        let mut color = 0;
+        for yd in 0..16 {
+            for xd in 0..16 {
+                dest.set_pixel(x + xd, y + yd, color);
+                color = color.wrapping_add(1);
+            }
+        }
+    }
 }
 
 impl Index<u8> for Palette {