Add image adjustments pipeline (brightness, contrast, crop, effects)

pixstrip-core/src/operations/mod.rs

@@ -1,3 +1,4 @@
+pub mod adjustments;
 pub mod metadata;
 pub mod rename;
 pub mod resize;
@@ -195,6 +196,35 @@ pub enum WatermarkConfig {
     },
 }
 
+// --- Adjustments ---
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AdjustmentsConfig {
+    pub brightness: i32,
+    pub contrast: i32,
+    pub saturation: i32,
+    pub sharpen: bool,
+    pub grayscale: bool,
+    pub sepia: bool,
+    pub crop_aspect_ratio: Option<(f64, f64)>,
+    pub trim_whitespace: bool,
+    pub canvas_padding: u32,
+}
+
+impl AdjustmentsConfig {
+    pub fn is_noop(&self) -> bool {
+        self.brightness == 0
+            && self.contrast == 0
+            && self.saturation == 0
+            && !self.sharpen
+            && !self.grayscale
+            && !self.sepia
+            && self.crop_aspect_ratio.is_none()
+            && !self.trim_whitespace
+            && self.canvas_padding == 0
+    }
+}
+
 // --- Rename ---
 
 #[derive(Debug, Clone, Serialize, Deserialize)]