fix(exporters): scale legend text with cell_size, extract layer_block_height helper

crates/exporters/src/image_export.rs

@@ -231,14 +231,18 @@ fn active_voxel_types(palette: &BlockPalette, grid: &VoxelGrid) -> Vec<VoxelType
     candidates
 }
 
-pub fn image_dimensions(grid: &VoxelGrid, palette: &BlockPalette, cell_size: u32) -> (u32, u32) {
+fn layer_block_height(grid: &VoxelGrid, cell_size: u32) -> u32 {
     let label_height = cell_size + 4;
     let per_layer_height = if grid.height == 0 {
         0
     } else {
         grid.height * (cell_size + GAP) - GAP
     };
-    let layer_block_height = label_height + GAP + per_layer_height;
+    label_height + GAP + per_layer_height
+}
+
+pub fn image_dimensions(grid: &VoxelGrid, palette: &BlockPalette, cell_size: u32) -> (u32, u32) {
+    let layer_block_height = layer_block_height(grid, cell_size);
     let total_grid_height = grid.depth * layer_block_height
         + grid.depth.saturating_sub(1) * GAP;
 
@@ -293,8 +297,8 @@ fn draw_legend(img: &mut RgbaImage, y_start: u32, palette: &BlockPalette, grid:
         draw_char(img, lx, ly, voxel_letter(*vt), lscale, COLOR_TEXT);
         let block_name = palette.resolve(vt);
         let text_x = GAP + cell_size + GAP * 3;
-        let text_y = y + (cell_size.saturating_sub(7)) / 2;
-        draw_text(img, text_x, text_y, &block_name, 1, COLOR_TEXT);
+        let text_y = y + (cell_size.saturating_sub(7 * lscale)) / 2;
+        draw_text(img, text_x, text_y, &block_name, lscale, COLOR_TEXT);
     }
 }
 
@@ -303,19 +307,14 @@ impl StructureExporter for PngExporter {
         use std::io::Cursor;
 
         let cs = self.cell_size;
+        let lbh = layer_block_height(grid, cs);
         let label_height = cs + 4;
-        let per_layer_height = if grid.height == 0 {
-            0
-        } else {
-            grid.height * (cs + GAP) - GAP
-        };
-        let layer_block_height = label_height + GAP + per_layer_height;
 
         let (img_w, img_h) = image_dimensions(grid, &self.palette, cs);
         let mut img = RgbaImage::from_pixel(img_w, img_h, Rgba(COLOR_BG));
 
         for z in 0..grid.depth {
-            let layer_top_y = z * (layer_block_height + GAP);
+            let layer_top_y = z * (lbh + GAP);
             draw_layer_label(&mut img, layer_top_y, z, cs);
 
             let grid_top_y = layer_top_y + label_height + GAP;
@@ -340,7 +339,7 @@ impl StructureExporter for PngExporter {
             }
         }
 
-        let total_grid_height = grid.depth * layer_block_height
+        let total_grid_height = grid.depth * lbh
             + grid.depth.saturating_sub(1) * GAP;
         draw_legend(&mut img, total_grid_height + GAP, &self.palette, grid, cs);