Some minor cleanup in the Blender/Psychopath communication code.

psychoblend/render.py

@@ -77,7 +77,7 @@ class PsychopathRender(bpy.types.RenderEngine):
 
         # Start Rendering!
         try:
-            self._process = subprocess.Popen([psy_binary] + args, bufsize=1, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
+            self._process = subprocess.Popen([psy_binary] + args, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
         except OSError:
             # TODO, report api
             print("Psychopath: could not execute '%s'" % psy_binary)
@@ -99,16 +99,16 @@ class PsychopathRender(bpy.types.RenderEngine):
         height = bucket_info[3] - bucket_info[1]
 
         # Decode pixel data
-        pixels = [p for p in struct.iter_unpack("ffff", base64.b64decode(pixels_encoded))]
-        pixels_flipped = []
+        pixels_unpacked = [p for p in struct.iter_unpack("ffff", base64.b64decode(pixels_encoded))]
+        pixels = []
         for i in range(height):
             n = height - i - 1
-            pixels_flipped += pixels[n*width:(n+1)*width]
+            pixels += pixels_unpacked[n*width:(n+1)*width]
 
         # Write pixel data to render image
         result = self.begin_result(x, y, width, height)
         lay = result.layers[0].passes["Combined"]
-        lay.rect = pixels_flipped
+        lay.rect = pixels
         self.end_result(result)
 
     def _render(self, depsgraph):

psychoblend/ui.py

@@ -74,7 +74,6 @@ register_engine_with_panels(
         "DATA_PT_mesh_attributes",
         "DATA_PT_normals",
         "DATA_PT_remesh",
-        "DATA_PT_sculpt_vertex_colors",
         "DATA_PT_shape_keys",
         "DATA_PT_texture_space",
         "DATA_PT_uv_texture",

src/image.rs

@@ -235,25 +235,39 @@ impl<'a> Bucket<'a> {
     /// encoding to base64.  The fourth channel is alpha, and is set to 1.0 for
     /// all pixels.
     pub fn rgba_base64<F>(&mut self, color_convert: F) -> String
+    where
+        F: Fn((f32, f32, f32)) -> (f32, f32, f32),
+    {
+        let data_u8 = self.rgba_raw(color_convert);
+        base64::encode(&data_u8)
+    }
+
+    /// Returns the bucket's contents as a binary string.
+    ///
+    /// The data is laid out as four-floats-per-pixel in scanline order.
+    /// The fourth channel is alpha, and is set to 1.0 for all pixels.
+    ///
+    /// `color_convert` lets you do a colorspace conversion before base64
+    /// encoding if desired.
+    pub fn rgba_raw<F>(&mut self, color_convert: F) -> Vec<u8>
     where
         F: Fn((f32, f32, f32)) -> (f32, f32, f32),
     {
         use std::slice;
-        let mut data = Vec::with_capacity(
-            (4 * (self.max.0 - self.min.0) * (self.max.1 - self.min.1)) as usize,
+        let mut data: Vec<u8> = Vec::with_capacity(
+            std::mem::size_of::<f32>()
+                * (4 * (self.max.0 - self.min.0) * (self.max.1 - self.min.1)) as usize,
         );
         for y in self.min.1..self.max.1 {
             for x in self.min.0..self.max.0 {
                 let color = color_convert(self.get(x, y).to_tuple());
-                data.push(color.0);
-                data.push(color.1);
-                data.push(color.2);
-                data.push(1.0);
+                data.extend_from_slice(&color.0.to_ne_bytes());
+                data.extend_from_slice(&color.1.to_ne_bytes());
+                data.extend_from_slice(&color.2.to_ne_bytes());
+                data.extend_from_slice(&1.0f32.to_ne_bytes());
             }
         }
-        let data_u8 =
-            unsafe { slice::from_raw_parts(&data[0] as *const f32 as *const u8, data.len() * 4) };
-        base64::encode(data_u8)
+        data
     }
 }
 

src/renderer.rs

@@ -293,16 +293,26 @@ impl<'a> Renderer<'a> {
             let new_string = format!("{:.2}%", percentage_new);
 
             if let Some(bucket_data) = base64_enc {
+                let mut stdout = std::io::stdout().lock();
                 // If doing Blender output
-                println!("DIV");
-                println!("{}", new_string);
-                println!(
-                    "{} {} {} {}",
+                stdout.write_all(b"DIV\n").unwrap();
+                stdout
+                    .write_all(format!("{}\n", new_string).as_bytes())
+                    .unwrap();
+                stdout
+                    .write_all(
+                        format!(
+                            "{} {} {} {}\n",
                             bucket_min.0, bucket_min.1, bucket_max.0, bucket_max.1
-                );
-                println!("{}", bucket_data);
-                println!("BUCKET_END");
-                println!("DIV");
+                        )
+                        .as_bytes(),
+                    )
+                    .unwrap();
+                stdout
+                    .write_all(format!("{}\n", bucket_data).as_bytes())
+                    .unwrap();
+                stdout.write_all(b"BUCKET_END\n").unwrap();
+                stdout.write_all(b"DIV\n").unwrap();
             } else {
                 // If doing console output
                 if new_string != old_string {