added the decoder and began to configure it

created new variables and initiated them with calues from the .info

added some questions

src/image_loader/mod.rs

@@ -1,15 +1,53 @@
 use std::path::Path;
-
 use crate::image::Image;
+use std::fs::File;
 
-pub fn image_loader(path: &Path) -> Image<f32> {
 
-        let vec: Vec<(f32, f32, f32, f32)> = vec![
-            (-33.0, 7732.0, 2564355.0, -79.0),
-            (1.0, 79.0, 255.0, 1.05),
-            (300.0, 300.0, 300.0, 300.0),
-        ];
-        let image: Image<f32> = Image::new(1, 3, vec);
+/*  !!!Fragen!!!
+    - was ist .unwrap()
+    - was ist ein IDAT chunk (bei read.info() in der doku)
+    - was ist .output_buffer_size()
+    - was ist .next_frame
+    - kann ich srgb nutzen für dir rgba values bzw für den rgb teil 
+    - woher ziehe ich den alpha channel
+    - ist makierter teil kommplet nötig
+ */
+
+pub fn image_loader(path: &Path) -> Image<f32> 
+{
+//marker1
+
+    // The decoder is a build for reader and can be used to set various decoding options
+    // via `Transformations`. The default output transformation is `Transformations::IDENTITY`.
+
+    //open a path in the decoder to look into the img
+    let decoder = png::Decoder::new(File::open(path).unwrap());
+
+    let mut reader = decoder.read_info().unwrap();
+    // Allocate the output buffer.
+    let mut buf = vec![0; reader.output_buffer_size()];
+    // Read the next frame. An APNG might contain multiple frames.
+    let info = reader.next_frame(&mut buf).unwrap();
+    
+    let bit_depth = reader.info().bit_depth;
+    let color_type = reader.info().color_type;
+    let width = reader.info().width;
+    let height = reader.info().height;
+
+    // Grab the bytes of the image.
+    let bytes = &buf[..info.buffer_size()];
+    // Inspect more details of the last read frame.
+    let in_animation = reader.info().frame_control.is_some();
+    
+//marker1
+    let vec: Vec<(f32, f32, f32, f32)> = vec!
+    [
+        (-33.0, 7732.0, 2564355.0, -79.0),
+        (1.0, 79.0, 255.0, 1.05),
+        (300.0, 300.0, 300.0, 300.0),
+    ];
+    let image: Image<f32> = Image::new(1, 3, vec, path.to_path_buf());
+    
     image
 }