Support scaling image depended on encoding

src/Tools/tim_tool/src/gui/file_tab.rs

@@ -2,6 +2,7 @@ use crate::MainWindow;
 use super::{GUIElements, GUIElementsRef, MainWindowRef, display_error};
 use slint::{Image, SharedString};
 use std::rc::Rc;
+use tim_tool::logic::tim::Encoding;
 use tool_helper::Error;
 
 pub struct FileTab {
@@ -10,6 +11,10 @@ pub struct FileTab {
 }
 
 impl FileTab {
+    const FOUR_BIT_NAME:&str   = "4 bit";
+    const EIGHT_BIT_NAME:&str  = "8 bit";
+    const FULL_COLOR_NAME:&str = "Full color";
+
     fn update_encoding_options(&self, width: u32, height: u32, has_palette: bool) -> Result<(), Error> {
         self.encoding_options.clear();
 
@@ -22,17 +27,17 @@ impl FileTab {
             }
 
             if has_4bit {
-                self.encoding_options.push(SharedString::from(format!("4 bit ({}/{})", width/4, height)));
+                self.encoding_options.push(SharedString::from(format!("{} ({}/{})", Self::FOUR_BIT_NAME, width/4, height)));
             }
 
             if has_8bit {
-                self.encoding_options.push(SharedString::from(format!("8 bit ({}/{})", width/2, height)));
+                self.encoding_options.push(SharedString::from(format!("{} ({}/{})", Self::EIGHT_BIT_NAME, width/2, height)));
             }
             Ok(())
         }
 
         else {
-            self.encoding_options.push(SharedString::from(format!("16 bit ({}/{})", width, height)));
+            self.encoding_options.push(SharedString::from(format!("{} ({}/{})", Self::FULL_COLOR_NAME, width, height)));
             Ok(())
         }
     }
@@ -102,6 +107,26 @@ impl FileTab {
         self.main_window.borrow().get_file_tab_image_name().to_string()
     }
 
+    pub fn get_encoding(&self) -> Result<Encoding, Error> {
+        let selected_encoding = self.main_window.borrow().get_file_tab_selected_encoding();
+        
+        if selected_encoding.starts_with(Self::FOUR_BIT_NAME) {
+            Ok(Encoding::FourBit)
+        }
+
+        else if selected_encoding.starts_with(Self::EIGHT_BIT_NAME) {
+            Ok(Encoding::EightBit)
+        }
+        
+        else if selected_encoding.starts_with(Self::FULL_COLOR_NAME) {
+            Ok(Encoding::FullColor)
+        }
+
+        else {
+            Err(Error::from_str("Failed to obtain encoding"))
+        }
+    }
+
     pub fn on_browse_file(&self, gui_elements: GUIElementsRef, mut function: impl FnMut(&mut GUIElements, &MainWindow) -> Result<(), Error> + 'static) {
         let main_window_cloned = self.main_window.clone();
         let gui_cloned         = gui_elements.clone();

src/Tools/tim_tool/src/logic/mod.rs

@@ -2,7 +2,7 @@ pub mod tim;
 
 use std::path::PathBuf;
 use slint::Image;
-use tim::TIMInfo;
+use tim::{Encoding, TIMInfo};
 use tool_helper::Error;
 
 pub struct Logic {
@@ -16,18 +16,18 @@ impl Logic {
 
     pub fn set_unadded_tim(&mut self, path: &PathBuf) -> Result<(Image, Option<Image>), Error> {
         let tim_info = TIMInfo::from_image(path)?;
-        let image    = tim_info.get_slint_images();
+        let image    = tim_info.get_slint_images(Encoding::FullColor);
 
         self.unadded_tim = Some(tim_info);
         Ok(image)
     }
 
-    pub fn add_unadded_tim_as(&mut self, _name: &String) -> Result<(Image, Option<Image>), Error> {
+    pub fn add_unadded_tim_as(&mut self, _name: &String, encoding: Encoding) -> Result<(Image, Option<Image>), Error> {
         if let Some(unadded_tim) = &self.unadded_tim {
-            let image = unadded_tim.get_slint_images();
+            let (image, palette) = unadded_tim.get_slint_images(encoding);
 
             self.unadded_tim = None;
-            Ok(image)
+            Ok((image, palette))
         }
 
         else {

src/Tools/tim_tool/src/logic/tim.rs

@@ -2,6 +2,12 @@ use std::{fs::File, path::PathBuf};
 use slint::{Rgba8Pixel, SharedPixelBuffer};
 use tool_helper::Error;
 
+pub enum Encoding {
+    FourBit,
+    EightBit,
+    FullColor,
+}
+
 pub struct TIMInfo {
     image_data: SharedPixelBuffer<Rgba8Pixel>,
     palette:    Option<PaletteInfo>,
@@ -86,8 +92,28 @@ impl TIMInfo {
         }
     }
 
-    pub fn get_slint_images(&self) -> (slint::Image, Option<slint::Image>) {
+    pub fn get_slint_images(&self, encoding: Encoding) -> (slint::Image, Option<slint::Image>) {
-        (slint::Image::from_rgba8_premultiplied(self.image_data.clone()), if let Some(palette) = &self.palette {
+        fn scaled_copy(src: &SharedPixelBuffer<Rgba8Pixel>, factor: u32) -> SharedPixelBuffer<Rgba8Pixel> {
+            let mut image_data = SharedPixelBuffer::<Rgba8Pixel>::new(src.width()/factor, src.height());
+            let mut dst_pixel  = image_data.make_mut_slice();
+            let     src_pixel  = src.as_slice();
+
+            for (idx, pixel) in src_pixel.into_iter().enumerate() {
+                if idx%factor as usize == 0 {
+                    dst_pixel[0] = *pixel;
+                    dst_pixel    = &mut dst_pixel[1..];
+                }
+            }
+            image_data
+        }
+
+        let image_data = match encoding {
+            Encoding::FourBit   => scaled_copy(&self.image_data, 4),
+            Encoding::EightBit  => scaled_copy(&self.image_data, 2),
+            Encoding::FullColor => self.image_data.clone()
+        };
+
+        (slint::Image::from_rgba8_premultiplied(image_data), if let Some(palette) = &self.palette {
             Some(palette.get_image())
         } else {
             None

src/Tools/tim_tool/src/main.rs

@@ -84,7 +84,8 @@ fn setup_file_tab(gui_elements_ref: Rc<RefCell<GUIElements>>, logic_ref: Rc<RefC
         let file_tab = &gui_elements.file_tab;
 
         let file_name              = file_tab.get_file_name();
-        let (image, palette_image) = logic.borrow_mut().add_unadded_tim_as(&file_name)?;
+        let encoding               = file_tab.get_encoding()?;
+        let (image, palette_image) = logic.borrow_mut().add_unadded_tim_as(&file_name, encoding)?;
 
         main_tab.add_new_vram_file(&file_name, image, palette_image);
         file_tab.clear_load();

src/Tools/tim_tool/ui/app-window.slint

@@ -22,6 +22,7 @@ export component MainWindow inherits Window {
     in-out property file_tab-palette_width        <=> file_tab.conv-palette_width;
     in-out property file_tab-palette_height       <=> file_tab.conv-palette_height;
     in-out property file_tab-palette_visible      <=> file_tab.conv-palette_enable;
+    in-out property file_tab-selected_encoding    <=> file_tab.conv-selected_encoding;
     in-out property file_tab-image_name           <=> file_tab.conv-image_name;
     in-out property file_tab-enable               <=> file_tab.conv-enable_view;
     callback        file_tab-update_palette_size  <=> file_tab.conv-image_update_palette_size;

src/Tools/tim_tool/ui/tab/file-tab.slint

@@ -21,6 +21,7 @@ component ConvertImageWidget inherits Rectangle {
     in-out property <image>    palette_data;
     in-out property <int>      palette_width:     0;
     in-out property <int>      palette_height:    0;
+    in-out property <string>   selected_encoding;
     in-out property <bool>     enable_view:       false;
     in-out property <bool>     palette_visible:   false;
 
@@ -94,6 +95,11 @@ component ConvertImageWidget inherits Rectangle {
                             ComboBox {
                                 model:         root.encoding_options;
                                 enabled:       root.enable_view;
+                                current-value: root.encoding_options[0];
+
+                                selected(current-value) => {
+                                    root.selected_encoding = current-value;
+                                }
                             }
                         }
                     }
@@ -205,6 +211,7 @@ export component FileTab inherits Rectangle {
     in-out property <image>    conv-palette_data;
     in-out property <int>      conv-palette_width;
     in-out property <int>      conv-palette_height;
+    in-out property <string>   conv-selected_encoding;
     in-out property <bool>     conv-palette_enable;
     in-out property <bool>     conv-enable_view;
 
@@ -253,6 +260,7 @@ export component FileTab inherits Rectangle {
                 palette_width     <=> root.conv-palette_width;
                 palette_height    <=> root.conv-palette_height;
                 palette_visible   <=> root.conv-palette_enable;
+                selected_encoding <=> root.conv-selected_encoding;
                 image_name        <=> root.conv-image_name;
                 enable_view       <=> root.conv-enable_view;