Render image widgets correctly on HiDPI displays when the display's window scale is not equal to 1.

CHANGELOG.md

@@ -21,6 +21,7 @@ All notable changes to eww will be listed here, starting at changes since versio
 - Load systray items that are registered without a path (By: Kage-Yami)
 - `get_locale` now follows POSIX standard for locale selection (By: mirhahn, w-lfchen)
 - Improve multi-monitor handling under wayland (By: bkueng)
+-  Render image widget at full resolution when display scaling is enabled (By: zane-weissman)
 
 ### Features
 - Add warning and docs for incompatible `:anchor` and `:exclusive` options

crates/eww/src/widgets/widget_definitions.rs

@@ -12,6 +12,7 @@ use eww_shared_util::Spanned;
 use gdk::{ModifierType, NotifyType};
 use glib::translate::FromGlib;
 use gtk::{self, glib, prelude::*, DestDefaults, TargetEntry, TargetList};
+use gtk::{cairo, gdk::ffi::gdk_cairo_surface_create_from_pixbuf};
 use gtk::{gdk, pango};
 use itertools::Itertools;
 use once_cell::sync::Lazy;
@@ -594,6 +595,7 @@ fn build_gtk_image(bargs: &mut BuilderArgs) -> Result<gtk::Image> {
         // @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");
             }
@@ -602,9 +604,11 @@ fn build_gtk_image(bargs: &mut BuilderArgs) -> Result<gtk::Image> {
                 let pixbuf_animation = gtk::gdk_pixbuf::PixbufAnimation::from_file(std::path::PathBuf::from(path))?;
                 gtk_widget.set_from_animation(&pixbuf_animation);
             } else {
-                let pixbuf;
+                let scale = gtk_widget.scale_factor();
+                let pixbuf: gtk::gdk_pixbuf::Pixbuf;
+
                 // populate the pixel buffer
-                if path.ends_with(".svg") && !fill_svg.is_empty() {
+                if path.ends_with(".svg") && !fill_svg.is_empty() { // render with fill
                     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=") {
@@ -615,12 +619,27 @@ fn build_gtk_image(bargs: &mut BuilderArgs) -> Result<gtk::Image> {
                         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>)?;
+                    pixbuf = gtk::gdk_pixbuf::Pixbuf::from_stream_at_scale(&stream, image_width * scale, image_height * scale, 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)?;
+                    let w = if image_width > 0 {image_width * scale} else {-1};
+                    let h = if image_height > 0 {image_height * scale} else {-1};
+                    pixbuf = gtk::gdk_pixbuf::Pixbuf::from_file_at_scale(std::path::PathBuf::from(path), w, h, preserve_aspect_ratio)?;
+                    //gtk_widget.set_from_pixbuf(Some(&pixbuf));
                 }
-                gtk_widget.set_from_pixbuf(Some(&pixbuf));
+
+                // render to surface
+                let surface = unsafe {
+                    // gtk::cairo::Surface will destroy the underlying surface on drop
+                    let ptr = gdk_cairo_surface_create_from_pixbuf(
+                        pixbuf.as_ptr(),
+                        scale,
+                        std::ptr::null_mut(),
+                    );
+                    cairo::Surface::from_raw_full(ptr)?
+                };
+
+                gtk_widget.set_from_surface(Some(surface.as_ref()));
             }
         },
         // @prop icon - name of a theme icon