Add cropped background image mode

src/config/Config.zig

@@ -461,7 +461,9 @@ foreground: Color = .{ .r = 0xFF, .g = 0xFF, .b = 0xFF },
 /// Valid values are:
 ///
 ///   * `zoomed` - Image is scaled to fit the window, preserving aspect ratio.
-///   * `scaled` - Image is scaled to fill the window, not preserving aspect ratio.
+///   * `stretched` - Image is stretched to fill the window, not preserving aspect ratio.
+///   * `cropped` - Image is centered in the window, preserving the aspect ratio
+///     but cropping the image to fill the window, as needed.
 ///   * `tiled` - Image is repeated horizontally and vertically to fill the window.
 ///   * `centered` - Image is centered in the window and displayed 1-to-1 pixel
 ///     scale, preserving both the aspect ratio and the image size.
@@ -5922,12 +5924,13 @@ pub const TextBlending = enum {
 pub const BackgroundImageMode = enum(u8) {
     zoomed = 0,
     stretched = 1,
-    tiled = 2,
-    centered = 3,
-    upper_left = 4,
-    upper_right = 5,
-    lower_left = 6,
-    lower_right = 7,
+    cropped = 2,
+    tiled = 3,
+    centered = 4,
+    upper_left = 5,
+    upper_right = 6,
+    lower_left = 7,
+    lower_right = 8,
 };
 
 /// See freetype-load-flag

src/renderer/shaders/bgimage.v.glsl

@@ -5,12 +5,13 @@
 // NOTE: this must be kept in sync with the BackgroundImageMode
 const uint MODE_ZOOMED = 0u;
 const uint MODE_STRETCHED = 1u;
-const uint MODE_TILED = 2u;
-const uint MODE_CENTERED = 3u;
-const uint MODE_UPPER_LEFT = 4u;
-const uint MODE_UPPER_RIGHT = 5u;
-const uint MODE_LOWER_LEFT = 6u;
-const uint MODE_LOWER_RIGHT = 7u;
+const uint MODE_CROPPED = 2u;
+const uint MODE_TILED = 3u;
+const uint MODE_CENTERED = 4u;
+const uint MODE_UPPER_LEFT = 5u;
+const uint MODE_UPPER_RIGHT = 6u;
+const uint MODE_LOWER_LEFT = 7u;
+const uint MODE_LOWER_RIGHT = 8u;
 
 layout (location = 0) in vec2 terminal_size;
 layout (location = 1) in uint mode;
@@ -32,20 +33,31 @@ void main() {
 	// Handles the scale of the image relative to the terminal size
 	vec2 scale = vec2(1.0, 1.0);
 
+	// Calculate the aspect ratio of the terminal and the image
+	vec2 aspect_ratio = vec2(
+		terminal_size.x / terminal_size.y,
+		image_size.x / image_size.y
+	);
+
 	switch (mode) {
 	case MODE_ZOOMED:
 		// If zoomed, we want to scale the image to fit the terminal
-		vec2 aspect_ratio = vec2(
-			terminal_size.x / terminal_size.y,
-			image_size.x / image_size.y
-		);
 		if (aspect_ratio.x > aspect_ratio.y) {
 			scale.x = aspect_ratio.y / aspect_ratio.x;
 		}
 		else {
 			scale.y = aspect_ratio.x / aspect_ratio.y;
 		}
 		break;
+	case MODE_CROPPED:
+		// If cropped, we want to scale the image to fit the terminal
+		if (aspect_ratio.x < aspect_ratio.y) {
+			scale.x = aspect_ratio.y / aspect_ratio.x;
+		}
+		else {
+			scale.y = aspect_ratio.x / aspect_ratio.y;
+		}
+		break;
 	case MODE_CENTERED:
 	case MODE_UPPER_LEFT:
 	case MODE_UPPER_RIGHT:
@@ -67,6 +79,7 @@ void main() {
 	switch (mode) {
 	case MODE_ZOOMED:
 	case MODE_STRETCHED:
+	case MODE_CROPPED:
 	case MODE_TILED:
 	case MODE_CENTERED:
 		offset = (terminal_size * (1.0 - scale)) / 2.0;