ui/egl-helpers: Augment parameter list of egl_texture_blend() to convey scales of viewport

This would help gtk-egl display showing scaled DMABuf cursor images when
gtk window was zoomed. A default scale of (1.0, 1.0) was presumed for
call sites where no scaling is needed.

Signed-off-by: Chen Zhang <tgfbeta@me.com>
Message-id: 23B229B3-3095-4DFB-8369-866784808D30@me.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
diff --git a/ui/spice-display.c b/ui/spice-display.c
index 52f8cb5..aea6f6e 100644
--- a/ui/spice-display.c
+++ b/ui/spice-display.c
@@ -1090,7 +1090,7 @@
         egl_texture_blit(ssd->gls, &ssd->blit_fb, &ssd->guest_fb,
                          !y_0_top);
         egl_texture_blend(ssd->gls, &ssd->blit_fb, &ssd->cursor_fb,
-                          !y_0_top, x, y);
+                          !y_0_top, x, y, 1.0, 1.0);
         glFlush();
     }