config: remove experimental linear and merge into text-blending

src/config/Config.zig

@@ -264,24 +264,16 @@ const c = @cImport({
 ///   This is also sometimes known as "gamma correction".
 ///   (Currently only supported on macOS. Has no effect on Linux.)
 ///
-///   To prevent the uneven thickness caused by linear blending, you can use
-///   the `experimental-linear-correction` option which applies a correction
-///   curve to the text alpha depending on its brightness, which compensates
-///   for the thinning and makes the weight of most text appear very similar
-///   to when it's blendeded non-linearly.
+/// * `linear-corrected` - Corrects the thinning/thickening effect of linear
+///   by applying a correction curve to the text alpha depending on its
+///   brightness. This compensates for the thinning and makes the weight of
+///   most text appear very similar to when it's blended non-linearly.
 ///
 /// Note: This setting affects more than just text, images will also be blended
 /// in the selected color space, and custom shaders will receive colors in that
 /// color space as well.
 @"text-blending": TextBlending = .native,
 
-/// Apply a correction curve to text alpha to compensate for uneven apparent
-/// thickness of different colors of text, roughly matching the appearance of
-/// text rendered with non-linear blending.
-///
-/// Has no effect if not using linear `text-blending`.
-@"experimental-linear-correction": bool = false,
-
 /// All of the configurations behavior adjust various metrics determined by the
 /// font. The values can be integers (1, -1, etc.) or a percentage (20%, -15%,
 /// etc.). In each case, the values represent the amount to change the original
@@ -5787,6 +5779,14 @@ pub const GraphemeWidthMethod = enum {
 pub const TextBlending = enum {
     native,
     linear,
+    @"linear-corrected",
+
+    pub fn isLinear(self: TextBlending) bool {
+        return switch (self) {
+            .native => false,
+            .linear, .@"linear-corrected" => true,
+        };
+    }
 };
 
 /// See freetype-load-flag

src/renderer/Metal.zig

@@ -389,7 +389,6 @@ pub const DerivedConfig = struct {
     vsync: bool,
     colorspace: configpkg.Config.WindowColorspace,
     blending: configpkg.Config.TextBlending,
-    experimental_linear_correction: bool,
 
     pub fn init(
         alloc_gpa: Allocator,
@@ -462,8 +461,6 @@ pub const DerivedConfig = struct {
             .vsync = config.@"window-vsync",
             .colorspace = config.@"window-colorspace",
             .blending = config.@"text-blending",
-            .experimental_linear_correction = config.@"text-blending" == .linear and config.@"experimental-linear-correction",
-
             .arena = arena,
         };
     }
@@ -559,7 +556,7 @@ pub fn init(alloc: Allocator, options: renderer.Options) !Metal {
         // the pixels written to it *after* blending, which means
         // we get linear alpha blending rather than gamma-incorrect
         // blending.
-        if (options.config.blending == .linear)
+        if (options.config.blending.isLinear())
             @intFromEnum(mtl.MTLPixelFormat.bgra8unorm_srgb)
         else
             @intFromEnum(mtl.MTLPixelFormat.bgra8unorm),
@@ -655,8 +652,8 @@ pub fn init(alloc: Allocator, options: renderer.Options) !Metal {
             },
             .cursor_wide = false,
             .use_display_p3 = options.config.colorspace == .@"display-p3",
-            .use_linear_blending = options.config.blending == .linear,
-            .use_experimental_linear_correction = options.config.experimental_linear_correction,
+            .use_linear_blending = options.config.blending.isLinear(),
+            .use_experimental_linear_correction = options.config.blending == .@"linear-corrected",
         },
 
         // Fonts
@@ -774,7 +771,7 @@ fn initShaders(self: *Metal) !void {
         // the pixels written to it *after* blending, which means
         // we get linear alpha blending rather than gamma-incorrect
         // blending.
-        if (self.config.blending == .linear)
+        if (self.config.blending.isLinear())
             mtl.MTLPixelFormat.bgra8unorm_srgb
         else
             mtl.MTLPixelFormat.bgra8unorm,
@@ -2071,9 +2068,8 @@ pub fn changeConfig(self: *Metal, config: *DerivedConfig) !void {
 
     // Set our new color space and blending
     self.uniforms.use_display_p3 = config.colorspace == .@"display-p3";
-    self.uniforms.use_linear_blending = config.blending == .linear;
-
-    self.uniforms.use_experimental_linear_correction = config.experimental_linear_correction;
+    self.uniforms.use_linear_blending = config.blending.isLinear();
+    self.uniforms.use_experimental_linear_correction = config.blending == .@"linear-corrected";
 
     // Set our new colors
     self.default_background_color = config.background;
@@ -2105,7 +2101,7 @@ pub fn changeConfig(self: *Metal, config: *DerivedConfig) !void {
         // And we update our layer's pixel format appropriately.
         self.layer.setProperty(
             "pixelFormat",
-            if (config.blending == .linear)
+            if (config.blending.isLinear())
                 @intFromEnum(mtl.MTLPixelFormat.bgra8unorm_srgb)
             else
                 @intFromEnum(mtl.MTLPixelFormat.bgra8unorm),
@@ -2231,7 +2227,7 @@ pub fn setScreenSize(
                 // the pixels written to it *after* blending, which means
                 // we get linear alpha blending rather than gamma-incorrect
                 // blending.
-                if (self.config.blending == .linear)
+                if (self.config.blending.isLinear())
                     @intFromEnum(mtl.MTLPixelFormat.bgra8unorm_srgb)
                 else
                     @intFromEnum(mtl.MTLPixelFormat.bgra8unorm),
@@ -2271,7 +2267,7 @@ pub fn setScreenSize(
                 // the pixels written to it *after* blending, which means
                 // we get linear alpha blending rather than gamma-incorrect
                 // blending.
-                if (self.config.blending == .linear)
+                if (self.config.blending.isLinear())
                     @intFromEnum(mtl.MTLPixelFormat.bgra8unorm_srgb)
                 else
                     @intFromEnum(mtl.MTLPixelFormat.bgra8unorm),