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cursor: Add function for calculating current frame in cursor animation

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Given a pointer to struct wl_cursor and an elapsed time in ms.,
wl_cursor_frame() will return the index of the cursor image the should
be displayed.
This commit is contained in:
Ander Conselvan de Oliveira 2012-06-15 17:27:33 +03:00 • committed by Kristian Høgsberg
parent b6aa49455e
commit 6b861f7b4d
2 changed files with 45 additions and 7 deletions
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49
cursor/wayland-cursor.c
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@ -129,6 +129,11 @@ struct cursor_image {
int offset; /* data offset of this image in the shm pool */
};
struct cursor {
struct wl_cursor cursor;
uint32_t total_delay; /* length of the animation in ms */
};
/** Get an shm buffer for a cursor image
*
* \param image The cursor image
@ -180,7 +185,7 @@ static struct wl_cursor *
wl_cursor_create_from_xcursor_images(XcursorImages *images,
struct wl_cursor_theme *theme)
{
struct wl_cursor *cursor;
struct cursor *cursor;
struct cursor_image *image;
int i, size;
@ -188,18 +193,20 @@ wl_cursor_create_from_xcursor_images(XcursorImages *images,
if (!cursor)
return NULL;
cursor->image_count = images->nimage;
cursor->images = malloc(images->nimage * sizeof cursor->images[0]);
if (!cursor->images) {
cursor->cursor.image_count = images->nimage;
cursor->cursor.images =
malloc(images->nimage * sizeof cursor->cursor.images[0]);
if (!cursor->cursor.images) {
free(cursor);
return NULL;
}
cursor->name = strdup(images->name);
cursor->cursor.name = strdup(images->name);
cursor->total_delay = 0;
for (i = 0; i < images->nimage; i++) {
image = malloc(sizeof *image);
cursor->images[i] = (struct wl_cursor_image *) image;
cursor->cursor.images[i] = (struct wl_cursor_image *) image;
image->theme = theme;
image->buffer = NULL;
@ -209,6 +216,7 @@ wl_cursor_create_from_xcursor_images(XcursorImages *images,
image->image.hotspot_x = images->images[i]->xhot;
image->image.hotspot_y = images->images[i]->yhot;
image->image.delay = images->images[i]->delay;
cursor->total_delay += image->image.delay;
/* copy pixels to shm pool */
size = image->image.width * image->image.height * 4;
@ -217,7 +225,7 @@ wl_cursor_create_from_xcursor_images(XcursorImages *images,
images->images[i]->pixels, size);
}
return cursor;
return &cursor->cursor;
}
static void
@ -318,3 +326,30 @@ wl_cursor_theme_get_cursor(struct wl_cursor_theme *theme,
return NULL;
}
/** Find the frame for a given elapsed time in a cursor animation
*
* \param cursor The cursor
* \param time Elapsed time since the beginning of the animation
*
* \return The index of the image that should be displayed for the
* given time in the cursor animation.
*/
WL_EXPORT int
wl_cursor_frame(struct wl_cursor *_cursor, uint32_t time)
{
struct cursor *cursor = (struct cursor *) _cursor;
uint32_t t;
int i;
if (cursor->cursor.image_count == 1)
return 0;
i = 0;
t = time % cursor->total_delay;
while (t - cursor->cursor.images[i]->delay < t)
t -= cursor->cursor.images[i++]->delay;
return i;
}