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2007-07-31 Emmanuele Bassi <ebassi@openedhand.com>

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* clutter/clutter-backend.[ch]: Add clutter_backend_set_resolution()
	and clutter_backend_get_resolution(); backends should use the former
	to set the resolution of the display when initialising, while actors
	should use the latter when sizing themselves depending on the
	resolution or the font size.

	* clutter/glx/clutter-backend-glx.c: Set the resolution as 96 dpi
	as a default and query the X server when opening the display.

	* clutter/clutter-entry.c: Drop the hardcoded dpi value and use
	clutter_backend_get_resolution() to compute the default size.
This commit is contained in:
Emmanuele Bassi
2007-07-31 10:38:23 +00:00
parent cae72ec419
commit dd93a0a13c
5 changed files with 92 additions and 10 deletions
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55
clutter/clutter-backend.c
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@ -41,6 +41,7 @@
#include "config.h"
#endif
#include "clutter-fixed.h"
#include "clutter-backend.h"
#include "clutter-private.h"
@ -55,7 +56,7 @@ struct _ClutterBackendPrivate
guint double_click_time;
guint double_click_distance;
ClutterFixed resolution;
};
static void
@ -91,6 +92,7 @@ clutter_backend_init (ClutterBackend *backend)
ClutterBackendPrivate *priv;
priv = backend->priv = CLUTTER_BACKEND_GET_PRIVATE(backend);
priv->resolution = -1.0;
}
ClutterActor *
@ -298,3 +300,54 @@ clutter_backend_get_double_click_distance (ClutterBackend *backend)
return backend->priv->double_click_distance;
}
/**
* clutter_backend_set_resolution:
* @backend: a #ClutterBackend
* @dpi: the resolution in "dots per inch" (Physical inches aren't
* actually involved; the terminology is conventional).
*
* Sets the resolution for font handling on the screen. This is a
* scale factor between points specified in a #PangoFontDescription
* and cairo units. The default value is 96, meaning that a 10 point
* font will be 13 units high. (10 * 96. / 72. = 13.3).
*
* Applications should never need to call this function.
*
* Since: 0.4
*/
void
clutter_backend_set_resolution (ClutterBackend *backend,
gdouble dpi)
{
ClutterFixed fixed_dpi;
g_return_if_fail (CLUTTER_IS_BACKEND (backend));
if (dpi < 0)
dpi = -1.0
fixed_dpi = CLUTTER_FLOAT_TO_FIXED (dpi);
if (priv->resolution != fixed_dpi)
priv->resolution = fixed_dpi;
}
/**
* clutter_backend_get_resolution:
* @backend: a #ClutterBackend
*
* Gets the resolution for font handling on the screen; see
* clutter_backend_set_resolution() for full details.
*
* Return value: the current resolution, or -1 if no resolution
* has been set.
*
* Since: 0.4
*/
gdouble
clutter_backend_get_resolution (ClutterBackend *backend)
{
g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), -1.0);
return CLUTTER_FIXED_TO_FLOAT (backend->priv->resolution);
}