Deconstruct PNG imag

src/Tools/jaby_engine_fconv/src/images/reduced_tim/mod.rs

@@ -42,15 +42,46 @@ fn convert_full16(input: Input, output: Output) -> Result<(), Error> {
                 DynamicImage::ImageRgb8(image)  => encode(RgbImage::new(image), output),
                 DynamicImage::ImageRgba8(image) => encode(RgbaImage::new(image), output),
 
-                _ => Err(Error::from_text("Only RGB and RGBA images are supported for 16bit encoding".to_owned()))
+                _ => Err(Error::from_str("Only RGB and RGBA images are supported for 16bit encoding"))
             }
         },
         Err(error) => Err(Error::from_error(error))
     }
 }
 
-fn convert_palette_based(_: Input, _: Output, _: ColorType) -> Result<(), Error> {
-    Err(Error::from_text("Not implemented yet".to_owned()))
+fn convert_palette_based(input: Input, _: Output, _: ColorType) -> Result<(), Error> {
+    match png::Decoder::new(input).read_info() {
+        Ok(mut reader) => {
+            let mut buf  = vec![0; reader.output_buffer_size()];
+
+            loop {
+                match reader.next_frame(&mut buf) {
+                    Ok(_) => {
+                        println!("Frame: {}", buf.len());
+                        for byte in &buf {
+                            print!("[{}] ", byte);
+                        }
+                        println!("");
+                    }
+                    Err(err) => {
+                        println!("Wuff: {}", err);
+                        break;
+                    }
+                }
+            }
+
+            let info = reader.info();
+            println!("picture: {} - {}, ({:?}, {:?}) ", info.width, info.height, info.color_type, info.bit_depth);
+            if let Some(pal) = &info.palette {
+                println!("Size of PAL: {}", pal.len());
+            }
+
+
+
+            Err(Error::from_str("Under construction"))
+        },
+        Err(error) => Err(Error::from_error(error))
+    }
 }
 
 pub fn convert(args: Arguments, input: Input, output: Output) -> Result<(), Error> {

src/Tools/tool_helper/src/lib.rs

@@ -15,6 +15,10 @@ pub struct Error {
 impl Error {
     const DEFAULT_EXITCODE:i32 = -1;
 
+    pub fn from_str(str: &str) -> Error {
+        Self::from_text(str.to_owned())
+    }
+
     pub fn from_text(text: String) -> Error {
         Error{exit_code: Self::DEFAULT_EXITCODE, action: String::new(), text}
     }