Bug 620526 - yv12 to rgb565 neon should not be used on cpus without neon. r=jmuizelaar. have ycbcr to rgb565. a=blocking-fennec

gfx/ycbcr/Makefile.in

@@ -20,6 +20,7 @@ EXPORTS      = chromium_types.h \
 CPPSRCS = yuv_convert.cpp \
           yuv_row_c.cpp \
           yuv_row_table.cpp \
+          ycbcr_to_rgb565.cpp \
           $(NULL)
 
 # Are we targeting x86 or x64?  If so, build yuv_convert_mmx.cpp and

gfx/ycbcr/ycbcr_to_rgb565.cpp

@@ -0,0 +1,120 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is mozilla.org code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 2002
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *  Tom Brinkman <reportbase@gmail.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "ycbcr_to_rgb565.h"
+
+//The logic for have_ycbcr_to_rgb565 is taken from pixman-cpu.c
+
+#if !defined (__arm__)
+
+int have_ycbcr_to_rgb565 ()
+{
+    return 0;
+}
+
+#else
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <elf.h>
+
+#ifdef ANDROID
+
+int have_ycbcr_to_rgb565 ()
+{
+    static int have_ycbcr_to_rgb565_initialized = 0;
+    static int arm_has_neon = 0;
+    if (!have_ycbcr_to_rgb565_initialized)
+    {
+        have_ycbcr_to_rgb565_initialized = 1;
+
+        char buf[1024];
+        const char* ver_token = "CPU architecture: ";
+        FILE* f = fopen("/proc/cpuinfo", "r");
+        if (!f) {
+	        return 0;
+        }
+
+        fread(buf, sizeof(char), 1024, f);
+        arm_has_neon = strstr(buf, "neon") != NULL;
+        fclose(f);
+    }
+    return arm_has_neon;
+}
+
+#else
+
+int have_ycbcr_to_rgb565 ()
+{
+    static int have_ycbcr_to_rgb565_initialized = 0;
+    static int arm_has_neon = 0;
+    if (!have_ycbcr_to_rgb565_initialized)
+    {
+        have_ycbcr_to_rgb565_initialized = 1;
+        int fd;
+        Elf32_auxv_t aux;
+
+        fd = open ("/proc/self/auxv", O_RDONLY);
+        if (fd >= 0)
+        {
+            while (read (fd, &aux, sizeof(Elf32_auxv_t)) == sizeof(Elf32_auxv_t))
+            {
+                if (aux.a_type == AT_HWCAP)
+                {
+                    uint32_t hwcap = aux.a_un.a_val;
+                    arm_has_neon = (hwcap & 4096) != 0;
+                    break;
+                }
+            }
+            close (fd);
+         }
+    }
+
+    return arm_has_neon;
+}
+
+#endif //ANDROID
+
+#endif //_MSC_VER
+

gfx/ycbcr/ycbcr_to_rgb565.h

@@ -0,0 +1,5 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+int have_ycbcr_to_rgb565();