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region-utils: Add API to transform an integer region

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The added API requires additional width and height arguments
to calculate transformed coordinates.
This commit is contained in:
Robert Mader 2018-11-26 18:26:47 +01:00
parent 1467b6b02a
commit 452ef4d5bb
2 changed files with 78 additions and 0 deletions
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72
src/compositor/region-utils.c
View File

@ -385,3 +385,75 @@ meta_make_border_region (cairo_region_t *region,
return border_region;
}
cairo_region_t *
meta_region_transform (cairo_region_t *region,
MetaMonitorTransform transform,
int width,
int height)
{
int n_rects, i;
cairo_rectangle_int_t *rects;
cairo_region_t *transformed_region;
if (transform == META_MONITOR_TRANSFORM_NORMAL)
return cairo_region_copy (region);
n_rects = cairo_region_num_rectangles (region);
rects = g_new0 (cairo_rectangle_int_t, n_rects);
for (i = 0; i < n_rects; i++)
{
cairo_rectangle_int_t rect;
cairo_region_get_rectangle (region, i, &rects[i]);
rect = rects[i];
switch (transform)
{
case META_MONITOR_TRANSFORM_90:
rects[i].x = width - (rect.y + rect.height);
rects[i].y = rect.x;
rects[i].width = rect.height;
rects[i].height = rect.width;
break;
case META_MONITOR_TRANSFORM_180:
rects[i].x = width - (rect.x + rect.width);
rects[i].y = height - (rect.y + rect.height);
break;
case META_MONITOR_TRANSFORM_270:
rects[i].x = rect.y;
rects[i].y = height - (rect.x + rect.width);
rects[i].width = rect.height;
rects[i].height = rect.width;
break;
case META_MONITOR_TRANSFORM_FLIPPED:
rects[i].x = width - (rect.x + rect.width);
break;
case META_MONITOR_TRANSFORM_FLIPPED_90:
rects[i].x = width - (rect.y + rect.height);
rects[i].y = height - (rect.x + rect.width);
rects[i].width = rect.height;
rects[i].height = rect.width;
break;
case META_MONITOR_TRANSFORM_FLIPPED_180:
rects[i].y = height - (rect.y + rect.height);
break;
case META_MONITOR_TRANSFORM_FLIPPED_270:
rects[i].x = rect.y;
rects[i].y = rect.x;
rects[i].width = rect.height;
rects[i].height = rect.width;
break;
case META_MONITOR_TRANSFORM_NORMAL:
g_assert_not_reached ();
}
}
transformed_region = cairo_region_create_rectangles (rects, n_rects);
g_free (rects);
return transformed_region;
}

6
src/compositor/region-utils.h
View File

@ -24,6 +24,7 @@
#include <cairo.h>
#include <glib.h>
#include "backends/meta-backend-types.h"
#include "clutter/clutter.h"
typedef enum _MetaRoundingStrategy
@ -110,4 +111,9 @@ cairo_region_t * meta_make_border_region (cairo_region_t *region,
int y_amount,
gboolean flip);
cairo_region_t * meta_region_transform (cairo_region_t *region,
MetaMonitorTransform transform,
int width,
int height);
#endif /* __META_REGION_UTILS_H__ */