[gnome-shell] Add shell_texture_cache_pixbufs_equal
- From: Colin Walters <walters src gnome org>
- To: svn-commits-list gnome org
- Cc:
- Subject: [gnome-shell] Add shell_texture_cache_pixbufs_equal
- Date: Wed, 2 Sep 2009 19:02:28 +0000 (UTC)
commit 926643b025c87c9343937965131fb9b2963f6d31
Author: Colin Walters <walters verbum org>
Date: Tue Sep 1 14:13:15 2009 -0400
Add shell_texture_cache_pixbufs_equal
Mutter is currently creating separate pixbufs for window icons;
use this to analyze them.
src/shell-texture-cache.c | 29 +++++++++++++++++++++++++++++
src/shell-texture-cache.h | 2 ++
2 files changed, 31 insertions(+), 0 deletions(-)
---
diff --git a/src/shell-texture-cache.c b/src/shell-texture-cache.c
index 0ed3446..93835af 100644
--- a/src/shell-texture-cache.c
+++ b/src/shell-texture-cache.c
@@ -1236,6 +1236,35 @@ shell_texture_cache_evict_recent_thumbnail (ShellTextureCache *cache,
shell_texture_cache_evict_thumbnail (cache, gtk_recent_info_get_uri (info));
}
+static size_t
+pixbuf_byte_size (GdkPixbuf *pixbuf)
+{
+ /* This bit translated from gtk+/gdk-pixbuf/gdk-pixbuf.c:gdk_pixbuf_copy. The comment
+ * there was:
+ *
+ * Calculate a semi-exact size. Here we copy with full rowstrides;
+ * maybe we should copy each row individually with the minimum
+ * rowstride?
+ */
+ return (gdk_pixbuf_get_height (pixbuf) - 1) * gdk_pixbuf_get_rowstride (pixbuf) +
+ + gdk_pixbuf_get_width (pixbuf) * ((gdk_pixbuf_get_n_channels (pixbuf)* gdk_pixbuf_get_bits_per_sample (pixbuf) + 7) / 8);
+}
+
+/**
+ * shell_texture_cache_pixbuf_equal:
+ *
+ * Returns: %TRUE iff the given pixbufs are bytewise-equal
+ */
+gboolean
+shell_texture_cache_pixbuf_equal (ShellTextureCache *cache, GdkPixbuf *a, GdkPixbuf *b)
+{
+ size_t size_a = pixbuf_byte_size (a);
+ size_t size_b = pixbuf_byte_size (b);
+ if (size_a != size_b)
+ return FALSE;
+ return memcmp (gdk_pixbuf_get_pixels (a), gdk_pixbuf_get_pixels (b), size_a) == 0;
+}
+
static ShellTextureCache *instance = NULL;
/**
diff --git a/src/shell-texture-cache.h b/src/shell-texture-cache.h
index 940e101..057eae3 100644
--- a/src/shell-texture-cache.h
+++ b/src/shell-texture-cache.h
@@ -79,4 +79,6 @@ ClutterActor *shell_texture_cache_load_uri_sync (ShellTextureCache *cache,
int available_height,
GError **error);
+gboolean shell_texture_cache_pixbuf_equal (ShellTextureCache *cache, GdkPixbuf *a, GdkPixbuf *b);
+
#endif /* __SHELL_TEXTURE_CACHE_H__ */
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