diff options
Diffstat (limited to 'libdocument')
| -rw-r--r-- | libdocument/ev-document-misc.c | 15 | ||||
| -rw-r--r-- | libdocument/ev-document-misc.h | 2 |
2 files changed, 17 insertions, 0 deletions
diff --git a/libdocument/ev-document-misc.c b/libdocument/ev-document-misc.c index 14bc3a3..0a23394 100644 --- a/libdocument/ev-document-misc.c +++ b/libdocument/ev-document-misc.c @@ -21,6 +21,7 @@ #include <config.h> #include <string.h> +#include <math.h> #include <gtk/gtk.h> @@ -363,3 +364,17 @@ ev_document_misc_invert_pixbuf (GdkPixbuf *pixbuf) } } } + +gdouble +ev_document_misc_get_screen_dpi (GdkScreen *screen) +{ + gdouble dp, di; + + /*diagonal in pixels*/ + dp = hypot (gdk_screen_get_width (screen), gdk_screen_get_height (screen)); + + /*diagonal in inches*/ + di = hypot (gdk_screen_get_width_mm(screen), gdk_screen_get_height_mm (screen)) / 25.4; + + return (dp / di); +} diff --git a/libdocument/ev-document-misc.h b/libdocument/ev-document-misc.h index 8e92983..61d070d 100644 --- a/libdocument/ev-document-misc.h +++ b/libdocument/ev-document-misc.h @@ -54,6 +54,8 @@ cairo_surface_t *ev_document_misc_surface_rotate_and_scale (cairo_surface_t *sur void ev_document_misc_invert_surface (cairo_surface_t *surface); void ev_document_misc_invert_pixbuf (GdkPixbuf *pixbuf); +gdouble ev_document_misc_get_screen_dpi (GdkScreen *screen); + G_END_DECLS #endif /* EV_DOCUMENT_MISC_H */ |