[PATCH wayland 2/2] cursor: Add function for calculating current frame in cursor animation
Ander Conselvan de Oliveira
ander.conselvan.de.oliveira at intel.com
Fri Jun 15 07:27:33 PDT 2012
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.
---
cursor/wayland-cursor.c | 49 ++++++++++++++++++++++++++++++++++++++++------
cursor/wayland-cursor.h | 3 ++
2 files changed, 45 insertions(+), 7 deletions(-)
diff --git a/cursor/wayland-cursor.c b/cursor/wayland-cursor.c
index 05d79e8..7621020 100644
--- a/cursor/wayland-cursor.c
+++ b/cursor/wayland-cursor.c
@@ -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;
+}
diff --git a/cursor/wayland-cursor.h b/cursor/wayland-cursor.h
index 355cdb4..c7548ae 100644
--- a/cursor/wayland-cursor.h
+++ b/cursor/wayland-cursor.h
@@ -60,6 +60,9 @@ wl_cursor_theme_get_cursor(struct wl_cursor_theme *theme,
struct wl_buffer *
wl_cursor_image_get_buffer(struct wl_cursor_image *image);
+int
+wl_cursor_frame(struct wl_cursor *cursor, uint32_t time);
+
#ifdef __cplusplus
}
#endif
--
1.7.4.1
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