Add horizontal predictor support (#240)

tests/encode_images_with_compression.rs

@@ -6,7 +6,7 @@ use tiff::{
     encoder::{
         colortype::{self, ColorType},
         compression::*,
-        TiffEncoder, TiffValue,
+        Compression, TiffEncoder, TiffValue,
     },
 };
 
@@ -18,15 +18,12 @@ trait TestImage<const NUM_CHANNELS: usize>: From<Vec<<Self::Color as ColorType>:
     fn reference_data(&self) -> &[<Self::Color as ColorType>::Inner];
     fn generate_pixel(x: u32, y: u32) -> [<Self::Color as ColorType>::Inner; NUM_CHANNELS];
 
-    fn compress<C: Compression, W: Write + Seek>(
-        &self,
-        encoder: &mut TiffEncoder<W>,
-        compression: C,
-    ) where
+    fn compress<W: Write + Seek>(&self, encoder: &mut TiffEncoder<W>)
+    where
         [<Self::Color as ColorType>::Inner]: TiffValue,
     {
         let image = encoder
-            .new_image_with_compression::<Self::Color, C>(Self::WIDTH, Self::HEIGHT, compression)
+            .new_image::<Self::Color>(Self::WIDTH, Self::HEIGHT)
             .unwrap();
         image.write_data(self.reference_data()).unwrap();
     }
@@ -94,7 +91,7 @@ impl TestImage<1> for TestImageGrayscale {
     }
 }
 
-fn encode_decode_with_compression<C: Compression + Clone>(compression: C) {
+fn encode_decode_with_compression(compression: Compression) {
     let mut data = Cursor::new(Vec::new());
 
     let image_rgb = TestImageColor::generate();
@@ -103,9 +100,11 @@ fn encode_decode_with_compression<C: Compression + Clone>(compression: C) {
     // Encode tiff with compression
     {
         // Create a multipage image with 2 images
-        let mut encoder = TiffEncoder::new(&mut data).unwrap();
-        image_rgb.compress(&mut encoder, compression.clone());
-        image_grayscale.compress(&mut encoder, compression);
+        let mut encoder = TiffEncoder::new(&mut data)
+            .unwrap()
+            .with_compression(compression);
+        image_rgb.compress(&mut encoder);
+        image_grayscale.compress(&mut encoder);
     }
 
     // Decode tiff
@@ -136,22 +135,22 @@ fn encode_decode_with_compression<C: Compression + Clone>(compression: C) {
 
 #[test]
 fn encode_decode_without_compression() {
-    encode_decode_with_compression(Uncompressed::default());
+    encode_decode_with_compression(Compression::Uncompressed);
 }
 
 #[test]
 fn encode_decode_with_lzw() {
-    encode_decode_with_compression(Lzw::default());
+    encode_decode_with_compression(Compression::Lzw);
 }
 
 #[test]
 fn encode_decode_with_deflate() {
-    encode_decode_with_compression(Deflate::with_level(DeflateLevel::Fast));
-    encode_decode_with_compression(Deflate::with_level(DeflateLevel::Balanced));
-    encode_decode_with_compression(Deflate::with_level(DeflateLevel::Best));
+    encode_decode_with_compression(Compression::Deflate(DeflateLevel::Fast));
+    encode_decode_with_compression(Compression::Deflate(DeflateLevel::Balanced));
+    encode_decode_with_compression(Compression::Deflate(DeflateLevel::Best));
 }
 
 #[test]
 fn encode_decode_with_packbits() {
-    encode_decode_with_compression(Packbits::default());
+    encode_decode_with_compression(Compression::Packbits);
 }