Refactor texture image filtering

- Support only `Linear` or `Nearest`
- Simplify `Layer` groups
- Move `FilterMethod` to `Image` and `image::Viewer`

tiny_skia/src/backend.rs

@@ -445,7 +445,11 @@ impl Backend {
                 );
             }
             #[cfg(feature = "image")]
-            Primitive::Image { handle, bounds } => {
+            Primitive::Image {
+                handle,
+                filter_method,
+                bounds,
+            } => {
                 let physical_bounds = (*bounds + translation) * scale_factor;
 
                 if !clip_bounds.intersects(&physical_bounds) {
@@ -461,8 +465,14 @@ impl Backend {
                 )
                 .post_scale(scale_factor, scale_factor);
 
-                self.raster_pipeline
-                    .draw(handle, *bounds, pixels, transform, clip_mask);
+                self.raster_pipeline.draw(
+                    handle,
+                    *filter_method,
+                    *bounds,
+                    pixels,
+                    transform,
+                    clip_mask,
+                );
             }
             #[cfg(not(feature = "image"))]
             Primitive::Image { .. } => {

tiny_skia/src/raster.rs

@@ -28,6 +28,7 @@ impl Pipeline {
     pub fn draw(
         &mut self,
         handle: &raster::Handle,
+        filter_method: raster::FilterMethod,
         bounds: Rectangle,
         pixels: &mut tiny_skia::PixmapMut<'_>,
         transform: tiny_skia::Transform,
@@ -39,7 +40,7 @@ impl Pipeline {
 
             let transform = transform.pre_scale(width_scale, height_scale);
 
-            let quality = match handle.filter().mag {
+            let quality = match filter_method {
                 raster::FilterMethod::Linear => {
                     tiny_skia::FilterQuality::Bilinear
                 }