[gnome-settings-daemon] wacom: rotate OLED labels on left-handed setups

[Carlos Garnacho <carlosg src gnome org>]

commit 3dbb560ab26c0d3984c906270dc0904b6a134c64
Author: Carlos Garnacho <carlosg gnome org>
Date:   Tue Nov 19 15:28:32 2013 +0100

    wacom: rotate OLED labels on left-handed setups
    
    If the tablet is set to left-handed mode, invert the labels so
    they look natural with the tablet physically rotated. CW and CCW
    modes are also taken into account, so text is always displayed
    from top to bottom, even though rotated 90 degrees.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=709667

 plugins/wacom/gsd-wacom-oled.c |   32 +++++++++++++++++++++++++-------
 1 files changed, 25 insertions(+), 7 deletions(-)
---
diff --git a/plugins/wacom/gsd-wacom-oled.c b/plugins/wacom/gsd-wacom-oled.c
index e610e92..35cc0a8 100644
--- a/plugins/wacom/gsd-wacom-oled.c
+++ b/plugins/wacom/gsd-wacom-oled.c
@@ -33,6 +33,7 @@
 
 #define MAGIC_BASE64           "base64:"               /*Label starting with base64: is treated as already 
encoded*/
 #define MAGIC_BASE64_LEN       strlen(MAGIC_BASE64)
+#define ROTATION_KEY           "rotation"
 
 static void
 oled_scramble_icon (guchar* image)
@@ -119,8 +120,9 @@ oled_split_text (char *label,
 }
 
 static void
-oled_render_text (char   *label,
-                 guchar *image)
+oled_render_text (char             *label,
+                 guchar           *image,
+                 GsdWacomRotation  rotation)
 {
        cairo_t *cr;
        cairo_surface_t *surface;
@@ -138,6 +140,16 @@ oled_render_text (char   *label,
 
        surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, OLED_WIDTH, OLED_HEIGHT);
        cr = cairo_create (surface);
+
+        /* Rotate text so it's seen correctly on the device, or at
+         * least from top to bottom for LTR text in vertical modes.
+         */
+        if (rotation == GSD_WACOM_ROTATION_HALF ||
+            rotation == GSD_WACOM_ROTATION_CCW) {
+               cairo_translate (cr, OLED_WIDTH, OLED_HEIGHT);
+               cairo_scale (cr, -1, -1);
+        }
+
        cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.99);
        cairo_paint (cr);
 
@@ -219,14 +231,15 @@ gsd_wacom_oled_gdkpixbuf_to_base64 (GdkPixbuf *pixbuf)
 }
 
 static char *
-oled_encode_image (char *label)
+oled_encode_image (char             *label,
+                   GsdWacomRotation  rotation)
 {
        guchar *image;
 
        image = g_malloc (MAX_IMAGE_SIZE);
 
        /* convert label to image */
-       oled_render_text (label, image);
+       oled_render_text (label, image, rotation);
        oled_scramble_icon (image);
 
        return (g_base64_encode (image, MAX_IMAGE_SIZE));
@@ -237,7 +250,9 @@ set_oled (GsdWacomDevice    *device,
          char                  *button_id,
          char                  *label)
 {
+       GsdWacomRotation device_rotation;
        GError *error = NULL;
+       GSettings *settings;
        const char *path;
        char *command;
        gboolean ret;
@@ -254,10 +269,13 @@ set_oled (GsdWacomDevice  *device,
        button_id_short = (int)button_id_1[6];
        button_id_short = button_id_short - 'A' - 1;
 
-       if (g_str_has_prefix (label, MAGIC_BASE64))
+       if (g_str_has_prefix (label, MAGIC_BASE64)) {
                buffer = g_strdup (label + MAGIC_BASE64_LEN);
-       else
-               buffer = oled_encode_image (label);
+        } else {
+               settings = gsd_wacom_device_get_settings (device);
+               device_rotation = g_settings_get_enum (settings, ROTATION_KEY);
+               buffer = oled_encode_image (label, device_rotation);
+       }
 
        path = gsd_wacom_device_get_path (device);