Touchscreen: Improved scroll threshold

Remove the hardcoded (and way too small) scroll threshold (the distance moved in pixels before we think the users wants to scroll) and replace it with something based on the actual DPI of the screen.
On Android we call the API for that, on other touchscreens we reimplemented Android's formula (as of 2.2) and calculate it.

Flyspray: 11727

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28548 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 2 insertions, 0 deletions

diff --git a/firmware/export/config/mrobe500.h b/firmware/export/config/mrobe500.h
index 9a201951fc..776b0315f8 100644
--- a/firmware/export/config/mrobe500.h
+++ b/firmware/export/config/mrobe500.h
@@ -87,9 +87,11 @@
 #if _RESOLUTION == _LCD_RES_VGA 
 #define LCD_NATIVE_WIDTH 480
 #define LCD_NATIVE_HEIGHT 640
+#define LCD_DPI 216
 #else
 #define LCD_NATIVE_WIDTH 240
 #define LCD_NATIVE_HEIGHT 320
+#define LCD_DPI 108
 #endif
 
 /* choose the lcd orientation. CONFIG_ORIENTATION defined in config.h */