Removing Image#CreateSurface from GTK

Removing CreateSurface method from image class and its callers as this method currently does not do anything.

Author: arunjose696

bundles/org.eclipse.swt/Eclipse SWT/cairo/org/eclipse/swt/graphics/Pattern.java

@@ -85,7 +85,6 @@ public Pattern(Device device, Image image) {
 	super(device);
 	if (image == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
 	if (image.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
-	image.createSurface();
 	handle = Cairo.cairo_pattern_create_for_surface(image.surface);
 	if (handle == 0) SWT.error(SWT.ERROR_NO_HANDLES);
 	Cairo.cairo_pattern_set_extend(handle, Cairo.CAIRO_EXTEND_REPEAT);

bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/graphics/GC.java

@@ -940,7 +940,6 @@ void drawImage(Image srcImage, int srcX, int srcY, int srcWidth, int srcHeight,
 	}
 	long cairo = data.cairo;
 	if (data.alpha != 0) {
-		srcImage.createSurface();
 		Cairo.cairo_save(cairo);
 		if ((data.style & SWT.MIRRORED) != 0) {
 			Cairo.cairo_scale(cairo, -1f,  1);

bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/graphics/Image.java

@@ -909,10 +909,6 @@ void createMask() {
 	C.memmove(surfaceData, srcData, srcData.length);
 }
 
-void createSurface() {
-	if (surface != 0) return;
-}
-
 /**
  * Destroy the receiver's mask if it exists.
  */