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monitor-manager: Add method to find an output matrix

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This will be useful to determine input device matrices for touchscreens
and tablets.

https://bugzilla.gnome.org/show_bug.cgi?id=739397
This commit is contained in:
Carlos Garnacho 2014-12-11 18:14:00 +01:00 committed by Jasper St. Pierre
parent 9d73b4efbb
commit 71c4138933
2 changed files with 69 additions and 0 deletions
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65
src/backends/meta-monitor-manager.c
View File

@ -45,6 +45,18 @@ enum {
SIGNALS_LAST
};
/* Array index matches MetaMonitorTransform */
static gfloat transform_matrices[][6] = {
{ 1, 0, 0, 0, 1, 0 }, /* normal */
{ 0, -1, 1, 1, 0, 0 }, /* 90° */
{ -1, 0, 1, 0, -1, 1 }, /* 180° */
{ 0, 1, 0, -1, 0, 1 }, /* 270° */
{ -1, 0, 1, 0, 1, 0 }, /* normal flipped */
{ 0, 1, 0, 1, 0, 0 }, /* 90° flipped */
{ 1, 0, 0, 0, -1, 1 }, /* 180° flipped */
{ 0, -1, 1, -1, 0, 1 }, /* 270° flipped */
};
static int signals[SIGNALS_LAST];
static void meta_monitor_manager_display_config_init (MetaDBusDisplayConfigIface *iface);
@ -1262,3 +1274,56 @@ meta_monitor_manager_on_hotplug (MetaMonitorManager *manager)
if (!applied_config)
meta_monitor_config_make_default (manager->config, manager);
}
static gboolean
calculate_viewport_matrix (MetaMonitorManager *manager,
MetaOutput *output,
gfloat viewport[6])
{
gfloat x, y, width, height;
if (!output->crtc)
return FALSE;
x = (float) output->crtc->rect.x / manager->screen_width;
y = (float) output->crtc->rect.y / manager->screen_height;
width = (float) output->crtc->rect.width / manager->screen_width;
height = (float) output->crtc->rect.height / manager->screen_height;
viewport[0] = width;
viewport[1] = 0.0f;
viewport[2] = x;
viewport[3] = 0.0f;
viewport[4] = height;
viewport[5] = y;
return TRUE;
}
static inline void
multiply_matrix (float a[6],
float b[6],
float res[6])
{
res[0] = a[0] * b[0] + a[1] * b[3];
res[1] = a[0] * b[1] + a[1] * b[4];
res[2] = a[0] * b[2] + a[1] * b[5] + a[2];
res[3] = a[3] * b[0] + a[4] * b[3];
res[4] = a[3] * b[1] + a[4] * b[4];
res[5] = a[3] * b[2] + a[4] * b[5] + a[5];
}
gboolean
meta_monitor_manager_get_monitor_matrix (MetaMonitorManager *manager,
MetaOutput *output,
gfloat matrix[6])
{
gfloat viewport[9];
if (!calculate_viewport_matrix (manager, output, viewport))
return FALSE;
multiply_matrix (viewport, transform_matrices[output->crtc->transform],
matrix);
return TRUE;
}

4
src/backends/meta-monitor-manager.h
View File

@ -371,6 +371,10 @@ gboolean meta_monitor_manager_has_hotplug_mode_update (MetaMonitorMana
void meta_monitor_manager_read_current_config (MetaMonitorManager *manager);
void meta_monitor_manager_on_hotplug (MetaMonitorManager *manager);
gboolean meta_monitor_manager_get_monitor_matrix (MetaMonitorManager *manager,
MetaOutput *output,
gfloat matrix[6]);
/* Returns true if transform causes width and height to be inverted
This is true for the odd transforms in the enum */
static inline gboolean