fix color premul complaints in examples

this should fix T498

legacy/elementary/src/bin/test_colorselector.c

@@ -13,12 +13,7 @@ _colorselector_changed_cb(void *data, Evas_Object *obj,
 
    elm_colorselector_color_get(obj, &r, &g, &b, &a);
    printf("Changed Color [r=%d g=%d b=%d a=%d]\n", r, g, b, a);
-
-   /* Fix Alpha pre multiplication by edje */
-   r = (r * a) / 255;
-   g = (g * a) / 255;
-   b = (b * a) / 255;
-
+   evas_color_argb_premul(&a, &r, &g, &b);
    evas_object_color_set(re, r, g, b, a);
 }
 

legacy/elementary/src/examples/colorselector_example_01.c

@@ -67,6 +67,8 @@ _change_color(void *data, Evas_Object *obj, void *event_info)
 {
    int r, g, b, a;
    elm_colorselector_color_get(obj, &r, &g, &b, &a);
+   // ensure colors are pre-multiplied by alpha
+   evas_color_argb_premul(a, &r, &g, &b);
    evas_object_color_set(data, r, g, b, a);
 }
 
@@ -76,6 +78,8 @@ _colorpalette_clicked_cb(void *data, Evas_Object *obj, void *event_info)
    int r = 0, g = 0, b = 0 ,a = 0;
    Elm_Object_Item *color_it = (Elm_Object_Item *) event_info;
    elm_colorselector_palette_item_color_get(color_it, &r, &g, &b, &a);
+   // ensure colors are pre-multiplied by alpha
+   evas_color_argb_premul(a, &r, &g, &b);
    evas_object_color_set(data, r, g, b, a);
 }
 

legacy/elementary/src/examples/transit_example_03.c

@@ -27,8 +27,8 @@ static void
 _transit_color(Elm_Transit *trans)
 {
    /* changes the object color from 100, 255, 100, 255 to
-    * 200, 50, 200, 50 */
-   elm_transit_effect_color_add(trans, 100, 255, 100, 255, 200, 50, 200, 50);
+    * 40, 10, 40, 50 */
+   elm_transit_effect_color_add(trans, 100, 255, 100, 255, 40, 10, 40, 50);
 }
 
 static void