blending stupidity

wxbox-tiler/src/sources/grib2.rs

@@ -1,6 +1,7 @@
 use std::collections::{BTreeMap, HashMap};
 use std::f64::consts::PI;
 use std::io::{BufWriter, Cursor, Read};
+use std::ops::{Add, Mul, Sub};
 use std::sync::Arc;
 use std::time::SystemTime;
 use actix_web::error::UrlencodedError::ContentType;
@@ -97,9 +98,9 @@ pub async fn render(xtile: f64, ytile: f64, z: i32, tilesize: usize, pal: Palett
                 }).map(|u| u as f64);
 
                 let color = match nearest {
-                    Some(c) if Some(c) == no_coverage => Color { red: 0, green: 0, blue: 0, alpha: 30 },
+                    Some(c) if Some(c) == no_coverage => Color { red: 0, green: 0, blue: 0, alpha: 255 },
                     Some(c) if Some(c) == missing => Color { red: 0, green: 0, blue: 0, alpha: 0 },
-                    Some(c) if Some(c) == range_folded => Color { red: 141, green: 0, blue: 160, alpha: 0 },
+                    Some(c) if Some(c) == range_folded => Color { red: 141, green: 0, blue: 160, alpha: 255 },
                     Some(value_at_pos) => {
                         pal.colorize(value_at_pos)
                     },
@@ -126,30 +127,90 @@ fn coloru8(i: f64) -> u8 {
     (i * u8::MAX as f64).floor() as u8
 }
 
+#[derive(Clone, Copy)]
+pub struct ColorF64 {
+    pub red: f64,
+    pub green: f64,
+    pub blue: f64,
+    pub alpha: f64
+}
+impl From<Color> for ColorF64 {
+    fn from(value: Color) -> Self {
+        Self {
+            red: colorf64(value.red),
+            green: colorf64(value.green),
+            blue: colorf64(value.blue),
+            alpha: colorf64(value.alpha)
+        }
+    }
+}
+impl From<ColorF64> for Color {
+    fn from(value: ColorF64) -> Self {
+        Self {
+            red: coloru8(value.red),
+            green: coloru8(value.green),
+            blue: coloru8(value.blue),
+            alpha: coloru8(value.alpha)
+        }
+    }
+}
+impl Add for ColorF64 {
+    type Output = ColorF64;
+
+    fn add(self, rhs: Self) -> Self::Output {
+        Self {
+            red: self.red + rhs.red,
+            green: self.green + rhs.green,
+            blue: self.blue + rhs.blue,
+            alpha: self.alpha + rhs.alpha
+        }
+    }
+}
+impl Sub for ColorF64 {
+    type Output = ColorF64;
+
+    fn sub(self, rhs: Self) -> Self::Output {
+        Self {
+            red: self.red - rhs.red,
+            green: self.green - rhs.green,
+            blue: self.blue - rhs.blue,
+            alpha: self.alpha - rhs.alpha
+        }
+    }
+}
+impl Mul for ColorF64 {
+    type Output = ColorF64;
+
+    fn mul(self, rhs: Self) -> Self::Output {
+        Self {
+            red: self.red * rhs.red,
+            green: self.green * rhs.green,
+            blue: self.blue * rhs.blue,
+            alpha: self.alpha * rhs.alpha
+        }
+    }
+}
+
+
 pub fn merge(base: Pixmap, data: Pixmap, settings: &TileRequestOptions) -> Pixmap {
     let mut new = Pixmap::new();
 
-    let a = settings.data_transparency;
-
     for x in 0..256 {
         for y in 0..256 {
-            let lower = base.get(x, y);
-            let upper = data.get(x, y);
+            let mut lower: ColorF64 = base.get(x, y).into();
+            lower.alpha = 1.0;
+            let mut upper: ColorF64 = data.get(x, y).into();
+            //upper.alpha = settings.data_transparency;
 
-            let lr = colorf64(lower.red);
-            let lg = colorf64(lower.green);
-            let lb = colorf64(lower.blue);
+            if upper.red == 0.0 && upper.green == 0.0 && upper.blue == 0.0 && upper.alpha == 0.0 {
+                lower.alpha = 1.0;
+                new.set(x, y, lower.into());
+            } else {
+                upper.alpha = 1.0;
+                new.set(x, y, upper.into());
+            }
 
-            let ur = colorf64(upper.red);
-            let ug = colorf64(upper.green);
-            let ub = colorf64(upper.blue);
-
-            new.set(x, y, Color {
-                red: coloru8(lr - (lr - ur) * a),
-                green: coloru8(lg - (lg - ug) * a),
-                blue: coloru8(lb - (lb - ub) * a),
-                alpha: 255
-            });
+//            new.set(x, y, ((ColorF64 { red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0 } - ColorF64 { red: 2.0, green: 2.0, blue: 2.0, alpha: 2.0 } * upper) * (lower * lower) + ColorF64 { red: 2.0, green: 2.0, blue: 2.0, alpha: 2.0 } * lower * upper).into());
         }
     }
 

wxbox_client/src/lib.rs

@@ -52,7 +52,7 @@ impl WxboxApp {
                     baselayer: "osm".to_string(),
 
                     data: "grib2/noaa_mrms_merged_composite_reflectivity_qc".to_string(),
-                    data_transparency: 0.5,
+                    data_transparency: 0.9,
                 }),
                 Default::default(),
                 ctx.clone()