Add build flag for forcing single buffer mode

RECOVERY_GRAPHICS_FORCE_SINGLE_BUFFER := true

Change-Id: Id5144ea772c3b7ae382b064c41c23acdd0decb84

minuitwrp/Android.mk

@@ -80,8 +80,8 @@ ifeq ($(RECOVERY_GRAPHICS_FORCE_USE_LINELENGTH), true)
 LOCAL_CFLAGS += -DRECOVERY_GRAPHICS_FORCE_USE_LINELENGTH
 endif
 
-ifeq ($(TW_DISABLE_DOUBLE_BUFFERING), true)
-LOCAL_CFLAGS += -DTW_DISABLE_DOUBLE_BUFFERING
+ifeq ($(RECOVERY_GRAPHICS_FORCE_SINGLE_BUFFER), true)
+LOCAL_CFLAGS += -DRECOVERY_GRAPHICS_FORCE_SINGLE_BUFFER
 endif
 
 #Remove the # from the line below to enable event logging

minuitwrp/graphics_fbdev.cpp

@@ -249,6 +249,7 @@ static GRSurface* fbdev_init(minui_backend* backend) {
     }
 
     /* check if we can use double buffering */
+#ifndef RECOVERY_GRAPHICS_FORCE_SINGLE_BUFFER
     if (vi.yres * fi.line_length * 2 <= fi.smem_len) {
         double_buffered = true;
         printf("double buffered\n");
@@ -258,6 +259,10 @@ static GRSurface* fbdev_init(minui_backend* backend) {
             gr_framebuffer[0].height * gr_framebuffer[0].row_bytes;
 
     } else {
+#else
+    {
+        printf("RECOVERY_GRAPHICS_FORCE_SINGLE_BUFFER := true\n");
+#endif
         double_buffered = false;
         printf("single buffered\n");
     }