remove pixelflinger from recovery

Recovery now draws directly to the framebuffer by rolling its own
graphics code, rather than depending on libpixelflinger.

The recovery UI is modified slightly to eliminate operations that are
slow with the software implementation: when the text display / menu is
turned on, it now appears on a black background instead of a dimmed
version of the recovery icon.

There's probably substantial room for optimization of the graphics
operations.

Bug: 12131110
Change-Id: Iab6520e0a7aaec39e2ce39377c10aef82ae0c595
diff --git a/minui/minui.h b/minui/minui.h
index 3250955..83c121e 100644
--- a/minui/minui.h
+++ b/minui/minui.h
@@ -23,22 +23,30 @@
 extern "C" {
 #endif
 
-typedef void* gr_surface;
-typedef unsigned short gr_pixel;
+typedef struct {
+    int width;
+    int height;
+    int row_bytes;
+    int pixel_bytes;
+    unsigned char* data;
+} GRSurface;
+
+typedef GRSurface* gr_surface;
 
 int gr_init(void);
 void gr_exit(void);
 
 int gr_fb_width(void);
 int gr_fb_height(void);
-gr_pixel *gr_fb_data(void);
+
 void gr_flip(void);
 void gr_fb_blank(bool blank);
 
+void gr_clear();  // clear entire surface to current color
 void gr_color(unsigned char r, unsigned char g, unsigned char b, unsigned char a);
 void gr_fill(int x1, int y1, int x2, int y2);
-int gr_text(int x, int y, const char *s, int bold);
- void gr_texticon(int x, int y, gr_surface icon);
+void gr_text(int x, int y, const char *s, int bold);
+void gr_texticon(int x, int y, gr_surface icon);
 int gr_measure(const char *s);
 void gr_font_size(int *x, int *y);