From 05a30e6fda4baa57aad5adfb8c5fb970b08c4970 Mon Sep 17 00:00:00 2001
From: Rohit-Bevinahally <rohit.bevinahally27@gmail.com>
Date: Sun, 23 Feb 2025 19:30:41 +0530
Subject: [PATCH] Add cropped mode

---
 src/config/Config.zig           | 17 ++++++++++-------
 src/renderer/shaders/cell.metal | 33 +++++++++++++++++++++++----------
 2 files changed, 33 insertions(+), 17 deletions(-)

diff --git a/src/config/Config.zig b/src/config/Config.zig
index 880105634..6fa895702 100644
--- a/src/config/Config.zig
+++ b/src/config/Config.zig
@@ -470,7 +470,9 @@ 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.
@@ -6634,12 +6636,13 @@ pub const AlphaBlending = 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
diff --git a/src/renderer/shaders/cell.metal b/src/renderer/shaders/cell.metal
index 9cef3397c..06f61cff0 100644
--- a/src/renderer/shaders/cell.metal
+++ b/src/renderer/shaders/cell.metal
@@ -692,12 +692,13 @@ fragment float4 image_fragment(
 enum BgImageMode : uint8_t {
   MODE_ZOOMED =  0u,
   MODE_STRETCHED = 1u,
-  MODE_TILED = 2u,
-  MODE_CENTERED = 3u,
-  MODE_UPPER_LEFT = 4u,
-  MODE_UPPER_RIGHT = 5u,
-  MODE_LOWER_LEFT = 6u,
-  MODE_LOWER_RIGHT = 7u,
+  MODE_CROPPED = 2u,
+  MODE_TILED = 3u,
+  MODE_CENTERED = 4u,
+  MODE_UPPER_LEFT = 5u,
+  MODE_UPPER_RIGHT = 6u,
+  MODE_LOWER_LEFT = 7u,
+  MODE_LOWER_RIGHT = 8u,
 };
 
 struct BgImageVertexIn {
@@ -729,13 +730,15 @@ vertex BgImageVertexOut bg_image_vertex(
   // Handles the scale of the image relative to the terminal size
   float2 scale = float2(1.0, 1.0);
 
+  // Calculate the aspect ratio of the terminal and the image
+  float2 aspect_ratio = float2(
+      in.terminal_size.x / in.terminal_size.y,
+      image_size.x / image_size.y
+  );
+
   switch (in.mode) {
     case MODE_ZOOMED: {
         // Scale to fit the terminal size
-        float2 aspect_ratio = float2(
-            in.terminal_size.x / in.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 {
@@ -743,6 +746,15 @@ vertex BgImageVertexOut bg_image_vertex(
         }
         break;
     }
+    case MODE_CROPPED: {
+        // Scale to fit the terminal size
+        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:
@@ -764,6 +776,7 @@ vertex BgImageVertexOut bg_image_vertex(
   float2 offset = float2(0.0, 0.0);
   switch (in.mode) {
     case MODE_ZOOMED:
+    case MODE_CROPPED:
     case MODE_STRETCHED:
     case MODE_TILED:
     case MODE_CENTERED: