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Use GDK methods to retrieve the actual screen DPI

Browse source 
gtk-gui.c:
+ added the method get_screen_dpi() that uses a simple
formula to retrieve the actual screen DPI
display.h:
+ use get_screen_dpi() in the SCALE_PRINT macro

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Lubomir I. Ivanov 2013-02-06 01:10:40 +02:00 • committed by Dirk Hohndel
parent 6bec608ea0
commit 30466b9abb
2 changed files with 12 additions and 2 deletions
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4
display.h
View file

@ -3,12 +3,12 @@
#include <cairo.h>
#define DPI_SCREEN 72.0
#define SCALE_SCREEN 1.0
#define SCALE_PRINT (1.0 / DPI_SCREEN)
#define SCALE_PRINT (1.0 / get_screen_dpi())
extern void repaint_dive(void);
extern void do_print(void);
extern gdouble get_screen_dpi(void);
/* Plot info with smoothing, velocity indication
* and one-, two- and three-minute minimums and maximums */

10
gtk-gui.c
View file

@ -2020,3 +2020,13 @@ void set_dc_nickname(struct dive *dive)
dc = dc->next;
}
}
gdouble get_screen_dpi(void)
{
const gdouble mm_per_inch = 25.4;
GdkScreen *scr = gdk_screen_get_default();
gdouble h_mm = gdk_screen_get_height_mm(scr);
gdouble h = gdk_screen_get_height(scr);
gdouble dpi_h = floor((h / h_mm) * mm_per_inch);
return dpi_h;
}