feat: add fill-svg and preserve-aspect-ratio attributes to image widget (#1148)

* feat: add fill-svg attribute to image widget

Co-authored-by: Eddy Otsutsuki <23711001+hypernova7@users.noreply.github.com>

* feat: add preserve-aspect-ratio attribute to image widget

* docs: document new attributes; changelog entry

---------

Co-authored-by: Eddy Otsutsuki <23711001+hypernova7@users.noreply.github.com>

CHANGELOG.md

@@ -12,6 +12,7 @@ All notable changes to eww will be listed here, starting at changes since versio
 
 ### Features
 - Update rust toolchain to 1.80.1 (By: w-lfchen)
+- Add `:fill-svg` and `:preserve-aspect-ratio` properties to images (By: hypernova7, w-lfchen)
 - Add `:truncate` property to labels, disabled by default (except in cases where truncation would be enabled in version `0.5.0` and before) (By: Rayzeq).
 - Add support for `:hover` css selectors for tray items (By: zeapoz)
 - Add `min` and `max` function calls to simplexpr (By: ovalkonia)

crates/eww/src/widgets/widget_definitions.rs

@@ -571,12 +571,35 @@ fn build_gtk_image(bargs: &mut BuilderArgs) -> Result<gtk::Image> {
         // @prop path - path to the image file
         // @prop image-width - width of the image
         // @prop image-height - height of the image
-        prop(path: as_string, image_width: as_i32 = -1, image_height: as_i32 = -1) {
+        // @prop preserve-aspect-ratio - whether to keep the aspect ratio when resizing an image. Default: true, false doesn't work for all image types
+        // @prop fill-svg - sets the color of svg images
+        prop(path: as_string, image_width: as_i32 = -1, image_height: as_i32 = -1, preserve_aspect_ratio: as_bool = true, fill_svg: as_string = "") {
+            if !path.ends_with(".svg") && !fill_svg.is_empty() {
+                log::warn!("Fill attribute ignored, file is not an svg image");
+            }
+
             if path.ends_with(".gif") {
                 let pixbuf_animation = gtk::gdk_pixbuf::PixbufAnimation::from_file(std::path::PathBuf::from(path))?;
                 gtk_widget.set_from_animation(&pixbuf_animation);
             } else {
-                let pixbuf = gtk::gdk_pixbuf::Pixbuf::from_file_at_size(std::path::PathBuf::from(path), image_width, image_height)?;
+                let pixbuf;
+                // populate the pixel buffer
+                if path.ends_with(".svg") && !fill_svg.is_empty() {
+                    let svg_data = std::fs::read_to_string(std::path::PathBuf::from(path.clone()))?;
+                    // The fastest way to add/change fill color
+                    let svg_data = if svg_data.contains("fill=") {
+                        let reg = regex::Regex::new(r#"fill="[^"]*""#)?;
+                        reg.replace(&svg_data, &format!("fill=\"{}\"", fill_svg))
+                    } else {
+                        let reg = regex::Regex::new(r"<svg")?;
+                        reg.replace(&svg_data, &format!("<svg fill=\"{}\"", fill_svg))
+                    };
+                    let stream = gtk::gio::MemoryInputStream::from_bytes(&gtk::glib::Bytes::from(svg_data.as_bytes()));
+                    pixbuf = gtk::gdk_pixbuf::Pixbuf::from_stream_at_scale(&stream, image_width, image_height, preserve_aspect_ratio, None::<&gtk::gio::Cancellable>)?;
+                    stream.close(None::<&gtk::gio::Cancellable>)?;
+                } else {
+                    pixbuf = gtk::gdk_pixbuf::Pixbuf::from_file_at_scale(std::path::PathBuf::from(path), image_width, image_height, preserve_aspect_ratio)?;
+                }
                 gtk_widget.set_from_pixbuf(Some(&pixbuf));
             }
         },