Add a "noop" implementation.

This new implementation is ahead of all other implementations in the
fallback chain and is supposed to contain operations that don't
require any work. For examples, it might contain a "fast path" for the
DST operator that doesn't actually do anything.

4 files changed, 51 insertions, 0 deletions

diff --git a/pixman/Makefile.am b/pixman/Makefile.am
index be082668..1e20bb02 100644
--- a/pixman/Makefile.am
+++ b/pixman/Makefile.am
@@ -20,6 +20,7 @@ libpixman_1_la_SOURCES =			\
 	pixman-combine64.h			\
 	pixman-general.c			\
 	pixman.c				\
+	pixman-noop.c				\
 	pixman-fast-path.c			\
 	pixman-fast-path.h			\
 	pixman-solid-fill.c			\
diff --git a/pixman/pixman-cpu.c b/pixman/pixman-cpu.c
index 0e14ecb6..973ed54e 100644
--- a/pixman/pixman-cpu.c
+++ b/pixman/pixman-cpu.c
@@ -606,6 +606,8 @@ _pixman_choose_implementation (void)
 	imp = _pixman_implementation_create_vmx (imp);
 #endif
 
+    imp = _pixman_implementation_create_noop (imp);
+    
     return imp;
 }
 
diff --git a/pixman/pixman-noop.c b/pixman/pixman-noop.c
new file mode 100644
index 00000000..f4462082
--- /dev/null
+++ b/pixman/pixman-noop.c
@@ -0,0 +1,45 @@
+/* -*- Mode: c; c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t; -*- */
+/*
+ * Copyright © 2011 Red Hat, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <string.h>
+#include <stdlib.h>
+#include "pixman-private.h"
+#include "pixman-combine32.h"
+#include "pixman-fast-path.h"
+
+static const pixman_fast_path_t noop_fast_paths[] =
+{
+    { PIXMAN_OP_NONE },
+};
+
+pixman_implementation_t *
+_pixman_implementation_create_noop (pixman_implementation_t *fallback)
+{
+    pixman_implementation_t *imp =
+	_pixman_implementation_create (fallback, noop_fast_paths);
+
+    return imp;
+}
diff --git a/pixman/pixman-private.h b/pixman/pixman-private.h
index 60060a99..2996907f 100644
--- a/pixman/pixman-private.h
+++ b/pixman/pixman-private.h
@@ -523,6 +523,9 @@ _pixman_implementation_create_general (void);
 pixman_implementation_t *
 _pixman_implementation_create_fast_path (pixman_implementation_t *fallback);
 
+pixman_implementation_t *
+_pixman_implementation_create_noop (pixman_implementation_t *fallback);
+
 #ifdef USE_MMX
 pixman_implementation_t *
 _pixman_implementation_create_mmx (pixman_implementation_t *fallback);