more font improvements and cleanup

Get rid of the notion of a font's "ascent"; the reference point for
drawing is the top-left corner of the character box rather than the
baseline.  Add some more space between the menu entries and make the
highlight bar around the text.

Replace the default font.png with two images; the build system will
include one or the other based on the resolutions of the device.

Restore the original compiled-in bitmap font, to fall back on when
font.png can't be found (eg, in the charger binary).

Add support for bold text (when a font.png image is used).

Change-Id: I6d211a486a3636f20208502b1cd2aeae8b9f5b02

1 files changed, 31 insertions, 17 deletions

diff --git a/screen_ui.cpp b/screen_ui.cpp
index 12af082..222de00 100644
--- a/screen_ui.cpp
+++ b/screen_ui.cpp
@@ -192,11 +192,9 @@ void ScreenRecoveryUI::draw_progress_locked()
     }
 }
 
-void ScreenRecoveryUI::draw_text_line(int row, const char* t) {
-  if (t[0] != '\0') {
-    gr_text(0, (row+1)*char_height-1, t);
-  }
-}
+#define C_HEADER  247,0,6
+#define C_MENU    0,106,157
+#define C_LOG     249,194,0
 
 // Redraw everything on the screen.  Does not flip pages.
 // Should only be called with updateMutex locked.
@@ -209,30 +207,46 @@ void ScreenRecoveryUI::draw_screen_locked()
         gr_color(0, 0, 0, 160);
         gr_fill(0, 0, gr_fb_width(), gr_fb_height());
 
+        int y = 0;
         int i = 0;
         if (show_menu) {
-            gr_color(64, 96, 255, 255);
-            gr_fill(0, (menu_top+menu_sel) * char_height,
-                    gr_fb_width(), (menu_top+menu_sel+1)*char_height+1);
+            gr_color(C_HEADER, 255);
 
             for (; i < menu_top + menu_items; ++i) {
+                if (i == menu_top) gr_color(C_MENU, 255);
+
                 if (i == menu_top + menu_sel) {
+                    // draw the highlight bar
+                    gr_fill(0, y-2, gr_fb_width(), y+char_height+2);
+                    // white text of selected item
                     gr_color(255, 255, 255, 255);
-                    draw_text_line(i, menu[i]);
-                    gr_color(64, 96, 255, 255);
+                    if (menu[i][0]) gr_text(4, y, menu[i], 1);
+                    gr_color(C_MENU, 255);
                 } else {
-                    draw_text_line(i, menu[i]);
+                    if (menu[i][0]) gr_text(4, y, menu[i], i < menu_top);
                 }
+                y += char_height+4;
             }
-            gr_fill(0, i*char_height+char_height/2-1,
-                    gr_fb_width(), i*char_height+char_height/2+1);
+            gr_color(C_MENU, 255);
+            y += 4;
+            gr_fill(0, y, gr_fb_width(), y+2);
+            y += 4;
             ++i;
         }
 
-        gr_color(255, 255, 0, 255);
-
-        for (; i < text_rows; ++i) {
-            draw_text_line(i, text[(i+text_top) % text_rows]);
+        gr_color(C_LOG, 255);
+
+        // display from the bottom up, until we hit the top of the
+        // screen, the bottom of the menu, or we've displayed the
+        // entire text buffer.
+        int ty;
+        int row = (text_top+text_rows-1) % text_rows;
+        for (int ty = gr_fb_height() - char_height, count = 0;
+             ty > y+2 && count < text_rows;
+             ty -= char_height, ++count) {
+            gr_text(4, ty, text[row], 0);
+            --row;
+            if (row < 0) row = text_rows-1;
         }
     }
 }