From e5ef173473e06a2c514e508cde1ae063d97497d9 Mon Sep 17 00:00:00 2001
From: servius <servius@darksailor.dev>
Date: Thu, 15 Jan 2026 17:25:09 +0530
Subject: [PATCH] fix(iced-video): Update the color matrices and subtract .5
 from uv samples to

---
 crates/iced-video/src/lib.rs                  |  1 -
 crates/iced-video/src/primitive.rs            | 56 ++++++++++---------
 .../iced-video/src/shaders/passthrough.wgsl   |  2 +-
 3 files changed, 32 insertions(+), 27 deletions(-)

diff --git a/crates/iced-video/src/lib.rs b/crates/iced-video/src/lib.rs
index 433d1a9..b23d22a 100644
--- a/crates/iced-video/src/lib.rs
+++ b/crates/iced-video/src/lib.rs
@@ -3,7 +3,6 @@ pub mod primitive;
 pub mod source;
 pub mod widget;
 pub use widget::Video;
-pub mod yuv;
 
 use error_stack::{Report, ResultExt};
 
diff --git a/crates/iced-video/src/primitive.rs b/crates/iced-video/src/primitive.rs
index 96dd381..b529db9 100644
--- a/crates/iced-video/src/primitive.rs
+++ b/crates/iced-video/src/primitive.rs
@@ -75,17 +75,17 @@ impl Vec3f {
 
 pub const BT2020_TO_RGB: ConversionMatrix = ConversionMatrix {
     matrix: [
-        Vec3f::from([1.0, 0.0, 1.13983]),
-        Vec3f::from([1.0, -0.39465, -0.58060]),
-        Vec3f::from([1.0, 2.03211, 0.0]),
+        Vec3f::from([1.0, 0.0, 1.4746]),
+        Vec3f::from([1.0, -0.16455, -0.5714]),
+        Vec3f::from([1.0, 1.8814, 0.0]),
     ],
 };
 
 pub const BT709_TO_RGB: ConversionMatrix = ConversionMatrix {
     matrix: [
-        Vec3f::from([1.0, 0.0, 1.13983]),
-        Vec3f::from([1.0, -0.39465, -0.58060]),
-        Vec3f::from([1.0, 2.03211, 0.0]),
+        Vec3f::from([1.0, 0.0, 1.5748]),
+        Vec3f::from([1.0, -0.1873, -0.4681]),
+        Vec3f::from([1.0, 1.8556, 0.0]),
     ],
 };
 
@@ -136,18 +136,28 @@ impl iced_wgpu::Primitive for VideoFrame {
                     },
                     wgpu::BindGroupEntry {
                         binding: 3,
-                        resource: wgpu::BindingResource::Buffer(buffer.as_entire_buffer_binding()),
+                        resource: wgpu::BindingResource::Buffer(
+                            texture
+                                .conversion_matrix_buffer()
+                                .as_entire_buffer_binding(),
+                        ),
                     },
                 ],
             });
 
-            // texture.write_conversion_matrix(&BT709_TO_RGB, queue);
+            let matrix = if matches!(self.format, VideoFormat::P01010le | VideoFormat::P016Le) {
+                BT2020_TO_RGB
+            } else {
+                BT709_TO_RGB
+            };
+
+            texture.write_conversion_matrix(&matrix, queue);
 
             VideoFrameData {
                 id: self.id.clone(),
                 texture,
                 bind_group,
-                conversion_matrix: BT709_TO_RGB,
+                conversion_matrix: matrix,
                 ready: Arc::clone(&self.ready),
             }
         });
@@ -156,6 +166,8 @@ impl iced_wgpu::Primitive for VideoFrame {
                 .texture
                 .resize("iced-video-texture-resized", self.size, device);
 
+            new_texture.write_conversion_matrix(&video.conversion_matrix, queue);
+
             let new_bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
                 label: Some("iced-video-texture-bind-group"),
                 layout: &pipeline.bind_group_layout,
@@ -175,7 +187,10 @@ impl iced_wgpu::Primitive for VideoFrame {
                     wgpu::BindGroupEntry {
                         binding: 3,
                         resource: wgpu::BindingResource::Buffer(
-                            video.conversion_matrix.as_entire_buffer_binding(),
+                            video
+                                .texture
+                                .conversion_matrix_buffer()
+                                .as_entire_buffer_binding(),
                         ),
                     },
                 ],
@@ -351,11 +366,6 @@ impl VideoTexture {
 
     /// This assumes that the data is laid out correctly for the texture format.
     pub fn write_texture(&self, data: &[u8], queue: &wgpu::Queue) {
-        // let (y, u, v) = match self.video_format {
-        //     VideoFormat::Nv12 | VideoFormat::P01010le | VideoFormat::P016Le => (4, 1, 1),
-        //     _ => (1, 1),
-        // };
-
         let Self { y, uv, .. } = self;
         let y_size = y.size();
         let uv_size = uv.size();
@@ -363,16 +373,8 @@ impl VideoTexture {
         let y_data_size = (y_size.width * y_size.height * 2) as usize;
         let uv_data_size = (y_data_size / 2) as usize; // UV is interleaved
 
-        // debug_assert_eq!(y_data_size, data.len() / 3 * 2);
-        // debug_assert_eq!(uv_data_size, data.len() / 3);
-        // let y_data = &data[0..y_data_size];
-        // let uv_data = &data[y_data_size..];
-        // dbg!(y_data.len());
-        // dbg!(uv_data.len());
-        // dbg!(y_data.len() + uv_data.len());
-        // dbg!(data.len());
-        // dbg!(y.size());
-        // dbg!(uv.size());
+        let y_data = &data[0..y_data_size];
+        let uv_data = &data[y_data_size..y_data_size + uv_data_size];
 
         queue.write_texture(
             wgpu::TexelCopyTextureInfo {
@@ -414,6 +416,10 @@ impl VideoTexture {
             bytemuck::bytes_of(matrix),
         );
     }
+
+    pub fn conversion_matrix_buffer(&self) -> &wgpu::Buffer {
+        &self.conversion_matrix_buffer
+    }
 }
 
 #[derive(Debug)]
diff --git a/crates/iced-video/src/shaders/passthrough.wgsl b/crates/iced-video/src/shaders/passthrough.wgsl
index d182ade..e7d02df 100644
--- a/crates/iced-video/src/shaders/passthrough.wgsl
+++ b/crates/iced-video/src/shaders/passthrough.wgsl
@@ -25,6 +25,6 @@ fn vs_main(
 fn fs_main(input: VertexOutput) -> @location(0) vec4<f32> {
     let y = textureSample(y_texture,  texture_sampler, input.tex_coords).r;
     let uv = textureSample(uv_texture, texture_sampler, input.tex_coords).rg;
-    let yuv = vec3f(y, uv);
+    let yuv = vec3f(y, uv.x - 0.5, uv.y - 0.5);
     return vec4f(yuv * rgb_primaries, 1.0);
 }