neon code for bgra to rgba conversion for copyFTBitmap

src/ports/SkFontHost_FreeType_common.cpp

 /*
  * Copyright 2006-2012 The Android Open Source Project
  * Copyright 2012 Mozilla Foundation
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkColor.h"
 #include "SkColorPriv.h"
 #include "SkFDot6.h"
 #include "SkFontHost_FreeType_common.h"
 #include "SkPath.h"
 
+#include "SkUtilsArm.h"
+#include "SkFontHost_FreeType_common_opts_neon.h"
+
 #include <ft2build.h>
 #include FT_FREETYPE_H
 #include FT_BITMAP_H
 #include FT_IMAGE_H
 #include FT_OUTLINE_H
 // In the past, FT_GlyphSlot_Own_Bitmap was defined in this header file.
 #include FT_SYNTHESIS_H
 
 // FT_LOAD_COLOR and the corresponding FT_Pixel_Mode::FT_PIXEL_MODE_BGRA
 // were introduced in FreeType 2.5.0.
@@ skipping 192 matching lines @@
                     bits = 8;
                 }
                 *dst_row++ = byte & 0x80 ? 0xff : 0x00;
                 bits--;
                 byte <<= 1;
             }
             src += srcPitch;
             dst += dstRowBytes;
         }
     } else if (FT_PIXEL_MODE_BGRA == srcFormat && SkMask::kARGB32_Format == dstFormat) {
+#if !defined(SK_CPU_ARM64) && !defined(SK_SHOW_TEXT_BLIT_COVERAGE) && !defined(SK_CPU_BENDIAN)
+        if (sk_cpu_arm_has_neon())
+        {

[reed1, 2015/01/29 15:47:20]

SkPMColor (which is the desired output swizzle) can be either BGRA or RGBA,
depending on compile flags, so we can't always call the new function. The
existing code calls a macro for packing, which always does the correct thing.

[frederic.ma, 2015/01/29 18:33:09]

My bad. I added compile flag to handle SkPMColor formats.

+            BGRA2RGBA_Neon(src, dst, height, width, dstRowBytes, srcPitch);
+            return;
+        }
+#endif            
         // FT_PIXEL_MODE_BGRA is pre-multiplied.
         for (size_t y = height; y --> 0;) {
             const uint8_t* src_row = src;
             SkPMColor* dst_row = reinterpret_cast<SkPMColor*>(dst);
             for (size_t x = 0; x < width; ++x) {
                 uint8_t b = *src_row++;
                 uint8_t g = *src_row++;
                 uint8_t r = *src_row++;
                 uint8_t a = *src_row++;
                 *dst_row++ = SkPackARGB32(a, r, g, b);
@@ skipping 317 matching lines @@
 
     FT_Error err = FT_Outline_Decompose(&face->glyph->outline, &funcs, path);
 
     if (err != 0) {
         path->reset();
         return;
     }
 
     path->close();
 }