libui: Add an interface to fill a Canvas with an array of pixels

libui/include/ui/Canvas.h

@@ -52,5 +52,13 @@ namespace ui
          * @param color The color to use.
          */
         void fill(Color color);
+
+        /**
+         * @brief Fill the canvas with pixels.
+         *
+         * @param pixels The array of pixels (must be at least width*height).
+         * @param stride The number of pixels to skip to go to the next line.
+         */
+        void fill(u32* pixels, int stride);
     };
 };

libui/src/Canvas.cpp

@@ -33,4 +33,21 @@ namespace ui
             p += stride * sizeof(Color);
         }
     }
+
+    void Canvas::fill(u32* pixels, int _stride)
+    {
+        u8* p = ptr;
+        for (int i = 0; i < height; i++)
+        {
+            u32* colorp = (u32*)p;
+            for (int j = 0; j < width; j++)
+            {
+                u32 pix = pixels[j];
+                if (Color::from_u32(pix).alpha() == 0xff) *colorp = pix;
+                colorp++;
+            }
+            pixels += _stride;
+            p += stride * sizeof(Color);
+        }
+    }
 }