Add error types and core image types: ImageFormat, ImageSource, Dimensions, QualityPreset

pixstrip-core/src/error.rs

@@ -1 +1,27 @@
-// Error types
+use std::path::PathBuf;
+
+#[derive(Debug, thiserror::Error)]
+pub enum PixstripError {
+    #[error("Failed to load image '{path}': {reason}")]
+    ImageLoad { path: PathBuf, reason: String },
+
+    #[error("Unsupported format: {format}")]
+    UnsupportedFormat { format: String },
+
+    #[error("I/O error: {0}")]
+    Io(#[from] std::io::Error),
+
+    #[error("Output file already exists: {path}")]
+    OutputExists { path: PathBuf },
+
+    #[error("Processing error in '{operation}': {reason}")]
+    Processing { operation: String, reason: String },
+
+    #[error("Preset error: {0}")]
+    Preset(String),
+
+    #[error("Configuration error: {0}")]
+    Config(String),
+}
+
+pub type Result<T> = std::result::Result<T, PixstripError>;