gamnit: intro `CustomTexture::fill`

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/gamnit/textures.nit b/lib/gamnit/textures.nit
index fabed02..4bc95cb 100644 (file)
--- a/lib/gamnit/textures.nit
+++ b/lib/gamnit/textures.nit
@@ -170,6 +170,29 @@ class CustomTexture
                for i in [0..4[ do cpixels[offset+i] = bytes[i]
        end
 
+       # Overwrite all pixels with `color`
+       #
+       # The argument `color` should be an array of up to 4 floats (RGBA).
+       # If `color` has less than 4 items, the missing items are replaced by 1.0.
+       #
+       # Require: `not loaded`
+       fun fill(color: Array[Float])
+       do
+               assert not loaded else print_error "{class_name}::fill already loaded"
+
+               # Simple conversion from [0.0..1.0] to [0..255]
+               var bytes = [for c in color do (c*255.0).round.to_i.clamp(0, 255).to_bytes.last]
+               while bytes.length < 4 do bytes.add 255u8
+
+               var i = 0
+               for x in [0..width.to_i[ do
+                       for y in [0..height.to_i[ do
+                               for j in [0..4[ do cpixels[i+j] = bytes[j]
+                               i += 4
+                       end
+               end
+       end
+
        redef fun load(force)
        do
                if loaded then return