mappings: implement some debug traits for viewing pixbufs

src/mappings.rs

@@ -4,6 +4,8 @@ use crate::lib8::scale8;
 
 use std::cmp::max;
 use std::fmt::{Formatter, Debug};
+use ansi_term::Color;
+use rgb::Rgb;
 
 pub trait CoordinateView: Debug {
     fn next(&mut self) -> Option<(VirtualCoordinates, PhysicalCoordinates)>;
@@ -13,6 +15,43 @@ pub trait PixelMapping<CoordData: CoordLimits<Data = CoordData>> {
     fn select(&self, rect: &Rectangle<CoordData, Virtual>) -> impl CoordinateView;
 }
 
+pub trait DisplayDump<T: PixelMapping<CoordData>, CoordData: CoordLimits<Data = CoordData>> {
+    fn dump(&self, map: &T);
+}
+
+impl<const PIXEL_NUM: usize> DisplayDump<LinearPixelMapping, u8> for [Rgb<u8>; PIXEL_NUM] {
+    fn dump(&self, _map: &LinearPixelMapping) {
+        for ref pixel in self {
+            print!("{}", Color::RGB(pixel.r, pixel.g, pixel.b).paint("█"));
+        }
+        println!();
+    }
+}
+
+impl<const PIXEL_NUM: usize> DisplayDump<StrideMapping, u8> for [Rgb<u8>; PIXEL_NUM] {
+    fn dump(&self, map: &StrideMapping) {
+        for y in 0..map.stride_count {
+            let stride = &map.strides[y];
+            for x in 0..stride.length {
+                let idx = if stride.reverse {
+                    stride.physical_idx + stride.length as usize - x as usize
+                } else {
+                    stride.physical_idx + x as usize
+                };
+                if idx >= self.len() {
+                    println!();
+                    println!("frame!!!");
+                    return;
+                }
+                let pixel = &self[idx];
+                print!("{}", Color::RGB(pixel.r, pixel.g, pixel.b).paint("█"));
+            }
+            println!();
+        }
+        println!("frame!!!");
+    }
+}
+
 #[derive(Debug)]
 struct LinearCoordView {
     rect: Rectangle<u8, Virtual>,