Use GTK_UNIT_INCH when printing to provide consistency across OS

Tests have shown that the most multi-platform way to do printing with GTK is
to use GTK_UNIT_INCH (or GTK_UNIT_MM) with GtkPrintOperation. Tested on
Linux, OSX, Windows.

However this requires the appropriate scaling for Pango and Cairo to be done,
with separate plotting logic for printing and drawing on the screen. To achieve
that, profile.c:plot() now accepts a scaling parameter from type
"scale_mode_t" defined in "display.h".

Also due to new scale, small decimal numbers (such as 6.12345) cannot be well
stored in "cairo_rectangle_int_t" therefore it is replaced with
"cairo_rectangle_t", which uses doubles to provide Cairo with a drawing
area.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>

Minor whitespace cleanup.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/gtk-gui.c b/gtk-gui.c
index 79933fb85..843f63e0c 100644
--- a/gtk-gui.c
+++ b/gtk-gui.c
@@ -1014,7 +1014,7 @@ static gboolean expose_event(GtkWidget *widget, GdkEventExpose *event, gpointer
 {
 	struct dive *dive = current_dive;
 	struct graphics_context gc = { .printer = 0 };
-	static cairo_rectangle_int_t drawing_area;
+	static cairo_rectangle_t drawing_area;
 
 	/* the drawing area gives TOTAL width * height - x,y is used as the topx/topy offset
 	 * so effective drawing area is width-2x * height-2y */
@@ -1035,7 +1035,7 @@ static gboolean expose_event(GtkWidget *widget, GdkEventExpose *event, gpointer
 			tooltip_rects = NULL;
 		}
 		tooltips = 0;
-		plot(&gc, &drawing_area, dive);
+		plot(&gc, &drawing_area, dive, SC_SCREEN);
 	}
 	cairo_destroy(gc.cr);