static function DrawTextureAlpha (position : Rect, image : Texture, scaleMode : ScaleMode = ScaleMode.StretchToFill, imageAspect : float = 0) : void

Parameters

Description

Draws the alpha channel of a texture within a rectangle.

See Also: GUI.color, GUI.contentColor

Alpha texture in an Editor Window.

// Load a texture, display the texture, display its alpha channel and
// show a preview of the inverted texture

class EditorGUITextures extends EditorWindow {

    var texture : Texture2D;
    var invertedTexture : Texture2D;
    var showInverted = false;
    
    @MenuItem("Examples/Texture Previewer")
    static function Init() {
        var window = GetWindow(EditorGUITextures);
        window.position = Rect(0,0,400, 200);
        window.Show();
    }
    
    function OnGUI() {
        texture = EditorGUI.ObjectField(Rect(3,3,200,20),
                "Add a Texture:",
                texture,
                Texture);
        if(GUI.Button(Rect(208,3, position.width - 210, 20),"Process Inverted")) {
            if(invertedTexture)
                DestroyImmediate(invertedTexture);
            //Copy the new texture
            invertedTexture = new Texture2D(texture.width, 
                    texture.height, 
                    texture.format, 
                    (texture.mipmapCount != 0));
            for (var m : int  = 0; m < texture.mipmapCount; m++) 
                invertedTexture.SetPixels(texture.GetPixels(m), m);
            InvertColors();
            showInverted = true;
        }
        if(texture) {
            EditorGUI.PrefixLabel(Rect(25,45,100,15),0,GUIContent("Preview:"));
            EditorGUI.DrawPreviewTexture(Rect(25,60,100,100),texture);
            EditorGUI.PrefixLabel(Rect(150,45,100,15),0,GUIContent("Alpha:"));
            EditorGUI.DrawTextureAlpha(Rect(150,60,100,100),texture);
            EditorGUI.PrefixLabel(Rect(275,45,100,15),0,GUIContent("Inverted:"));
            if(showInverted)
                EditorGUI.DrawPreviewTexture(Rect(275,60,100,100),invertedTexture);
            if(GUI.Button(Rect(3,position.height - 25, position.width-6,20),"Clear texture")) {
                texture = EditorGUIUtility.whiteTexture;
                showInverted = false;
            }
        } else {
            EditorGUI.PrefixLabel(
                Rect(3,position.height - 25,position.width - 6, 20),
                0,
                GUIContent("No texture found"));
        }
    }
    
    function InvertColors() { 
        for (var m : int  = 0; m < invertedTexture.mipmapCount; m++) {
            var c : Color[] = invertedTexture.GetPixels(m);
            for (var i : int = 0 ;i < c.Length; i++) {
                c[i].r = 1 - c[i].r;
                c[i].g = 1 - c[i].g;
                c[i].b = 1 - c[i].b;
            }
            invertedTexture.SetPixels(c, m); 
        }
        invertedTexture.Apply();
    }
    function OnInspectorUpdate() {
        Repaint();
    }
}