From b5d0bd024cbf7b33b67f51e712f4557488aa4d01 Mon Sep 17 00:00:00 2001
From: Carlos Silva <r3pek@r3pek.org>
Date: Mon, 17 Jan 2011 00:22:40 +0000
Subject: [PATCH] Add support for devices that have an upside-down mounted
 display.

ZTE Blade is an example of this type of devices.
The original patch comes from Sebastian404 -> http://goo.gl/QC37W

Change-Id: Idffd97adf7da8a352617342bb6ff2161e6eac3a5
---
 minui/Android.mk |  4 ++++
 minui/graphics.c | 10 ++++++++++
 2 files changed, 14 insertions(+)

diff --git a/minui/Android.mk b/minui/Android.mk
index d71cea2..44f9fa1 100644
--- a/minui/Android.mk
+++ b/minui/Android.mk
@@ -15,6 +15,10 @@ ifneq ($(BOARD_HAS_JANKY_BACKBUFFER),)
     LOCAL_CFLAGS += -DBOARD_HAS_JANKY_BACKBUFFER
 endif
 
+ifeq ($(BOARD_HAS_FLIPPED_SCREEN), true)
+    LOCAL_CFLAGS += -DBOARD_HAS_FLIPPED_SCREEN
+endif
+
 LOCAL_MODULE := libminui
 
 include $(BUILD_STATIC_LIBRARY)
diff --git a/minui/graphics.c b/minui/graphics.c
index 915873b..8192d3f 100644
--- a/minui/graphics.c
+++ b/minui/graphics.c
@@ -144,6 +144,16 @@ void gr_flip(void)
     /* swap front and back buffers */
     gr_active_fb = (gr_active_fb + 1) & 1;
 
+#ifdef BOARD_HAS_FLIPPED_SCREEN
+    /* flip buffer 180 degrees for devices with physicaly inverted screens */
+    unsigned int i;
+    for (i = 1; i < (vi.xres * vi.yres); i++) {
+        unsigned short tmp = gr_mem_surface.data[i];
+        gr_mem_surface.data[i] = gr_mem_surface.data[(vi.xres * vi.yres * 2) - i];
+        gr_mem_surface.data[(vi.xres * vi.yres * 2) - i] = tmp;
+    }
+#endif
+
     /* copy data from the in-memory surface to the buffer we're about
      * to make active. */
     memcpy(gr_framebuffer[gr_active_fb].data, gr_mem_surface.data,