From bee2883e1015327e0d1f4b04b502dede4ca9a3d6 Mon Sep 17 00:00:00 2001
From: rhetenor <rhetenor@rhetenor.de>
Date: Sat, 26 Sep 2026 19:41:08 +0200
Subject: [PATCH] sprite: add parameters to pass start position and render
 target size

---
 src/display/sprite.rs  | 35 ++++++++++++++++++++---------------
 src/views/card_view.rs |  8 +++++++-
 2 files changed, 27 insertions(+), 16 deletions(-)

diff --git a/src/display/sprite.rs b/src/display/sprite.rs
index b5dec5b..b089c8c 100644
--- a/src/display/sprite.rs
+++ b/src/display/sprite.rs
@@ -4,26 +4,31 @@ use embedded_graphics::{
 };
 use embedded_graphics_core::draw_target::DrawTarget;
 
-pub fn render_sprite_onto_ili9341<D>(ili9341: &mut D, sprite: &[u8], palette: &Palette)
-where
+pub fn render_sprite_onto_ili9341<D>(
+    ili9341: &mut D,
+    sprite: &[u8],
+    palette: &Palette,
+    start_pos: Point,
+    size: usize,
+) where
     D: DrawTarget<Color = Rgb565>,
 {
+    log::info!("rendering sprite...");
     let pixel_count = sprite.len() * 2;
     if pixel_count == 0 {
         return;
     }
 
-    let mut src_width = 1usize;
-    while src_width * src_width < pixel_count {
-        src_width += 1;
-    }
+    let src_size = pixel_count.isqrt();
 
-    let target_width = 240usize;
-    let scale = core::cmp::max(1, target_width / src_width);
+    log::debug!("pixel count: {pixel_count}");
+    log::debug!("src size: {src_size}");
+    let scale = size as f64 / src_size as f64;
 
-    for y in 0..src_width {
-        for x in 0..src_width {
-            let pixel_index = y * src_width + x;
+    log::debug!("scale: {scale}");
+    for y in 0..src_size {
+        for x in 0..src_size {
+            let pixel_index = y * src_size + x;
             if pixel_index >= pixel_count {
                 break;
             }
@@ -39,10 +44,10 @@ where
 
             let color = palette[color_index as usize];
 
-            let start_x = (x * scale) as i32;
-            let start_y = (y * scale) as i32;
-            let end_x = core::cmp::min(start_x + scale as i32, target_width as i32);
-            let end_y = core::cmp::min(start_y + scale as i32, target_width as i32);
+            let start_x = start_pos.x + (x as f64 * scale) as i32;
+            let start_y = start_pos.y + (y as f64 * scale) as i32;
+            let end_x = start_x + scale as i32 + 1;
+            let end_y = start_y + scale as i32 + 1;
 
             let width = u32::try_from(end_x - start_x).unwrap();
             let height = u32::try_from(end_y - start_y).unwrap();
diff --git a/src/views/card_view.rs b/src/views/card_view.rs
index d67ff56..9eb71b9 100644
--- a/src/views/card_view.rs
+++ b/src/views/card_view.rs
@@ -104,7 +104,13 @@ impl Navigable for CardView {
             .map_err(PrimaryDisplayError::from)?;
 
             let palette: Palette = self.card.cardtype.clone().into();
-            render_sprite_onto_ili9341(display, self.card.sprite.data.as_slice(), &palette);
+            render_sprite_onto_ili9341(
+                display,
+                self.card.sprite.data.as_slice(),
+                &palette,
+                Point::new(13, 10),
+                215,
+            );
             Ok(())
         }
     }