Implement support for rendering color emoji on Windows

tools/sk_tool_utils.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "sk_tool_utils.h"
 #include "sk_tool_utils_flags.h"
 
 #include "Resources.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkCommonFlags.h"
+#include "SkFontMgr.h"
+#include "SkFontStyle.h"
 #include "SkPoint3.h"
 #include "SkShader.h"
 #include "SkTestScalerContext.h"
 #include "SkTextBlob.h"
 
 DEFINE_bool(portableFonts, false, "Use portable fonts");
 
 namespace sk_tool_utils {
 
 /* these are the default fonts chosen by Chrome for serif, sans-serif, and monospace */
@@ skipping 40 matching lines @@
 }
 
 const char* platform_os_emoji() {
     const char* osName = platform_os_name();
     if (!strcmp(osName, "Android") || !strcmp(osName, "Ubuntu")) {
         return "CBDT";
     }
     if (!strncmp(osName, "Mac", 3)) {
         return "SBIX";
     }
+    if (!strncmp(osName, "Win", 3)) {
+        return "COLR";
+    }
     return "";
 }
 
 sk_sp<SkTypeface> emoji_typeface() {
     if (!strcmp(sk_tool_utils::platform_os_emoji(), "CBDT")) {
         return MakeResourceAsTypeface("/fonts/Funkster.ttf");
     }
     if (!strcmp(sk_tool_utils::platform_os_emoji(), "SBIX")) {
         return SkTypeface::MakeFromName("Apple Color Emoji", SkTypeface::kNormal);
     }
+    if (!strcmp(sk_tool_utils::platform_os_emoji(), "COLR")) {
+        sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault());
+        const char *colorEmojiFontName = "Segoe UI Emoji";
+        sk_sp<SkTypeface> typeface(fm->matchFamilyStyle(colorEmojiFontName, SkFontStyle()));
+        if (typeface) {
+            return typeface;
+        }
+        sk_sp<SkTypeface> fallback(fm->matchFamilyStyleCharacter(
+            colorEmojiFontName, SkFontStyle(), nullptr /* bcp47 */, 0 /* bcp47Count */,
+            0x1f4b0 /* character: 💰 */));
+        if (fallback) {
+            return fallback;
+        }
+        // If we don't have Segoe UI Emoji and can't find a fallback, try Segoe UI Symbol.
+        // Windows 7 does not have Segoe UI Emoji; Segoe UI Symbol has the (non - color) emoji.
+        return SkTypeface::MakeFromName("Segoe UI Symbol", SkTypeface::kNormal);

[bungeman-skia, 2016/05/31 19:19:58]

This line conflicts with another change that just landed.
SkTypeface::MakeFromName now takes SkFontStyle instead of SkTypeface::Style.
This should now be

return SkTypeface::MakeFromName("Segoe UI Symbol", SkFontStyle());

You'll probably want to rebase as well.

[Ilya Kulshin, 2016/06/01 05:47:43]

Done. Thanks for the headsup.

+    }
     return nullptr;
 }
 
 const char* emoji_sample_text() {
     if (!strcmp(sk_tool_utils::platform_os_emoji(), "CBDT")) {
         return "Hamburgefons";
     }
-    if (!strcmp(sk_tool_utils::platform_os_emoji(), "SBIX")) {
+    if (!strcmp(sk_tool_utils::platform_os_emoji(), "SBIX") ||
+        !strcmp(sk_tool_utils::platform_os_emoji(), "COLR"))
+    {
         return "\xF0\x9F\x92\xB0" "\xF0\x9F\x8F\xA1" "\xF0\x9F\x8E\x85"  // 💰🏡🎅
                "\xF0\x9F\x8D\xAA" "\xF0\x9F\x8D\x95" "\xF0\x9F\x9A\x80"  // 🍪🍕🚀
                "\xF0\x9F\x9A\xBB" "\xF0\x9F\x92\xA9" "\xF0\x9F\x93\xB7" // 🚻💩📷
                "\xF0\x9F\x93\xA6" // 📦
                "\xF0\x9F\x87\xBA" "\xF0\x9F\x87\xB8" "\xF0\x9F\x87\xA6"; // 🇺🇸🇦
     }
     return "";
 }
 
 const char* platform_os_name() {
@@ skipping 330 matching lines @@
     for (int y = 0; y < src.height(); ++y) {
         for (int x = 0; x < src.width(); ++x) {
             *dst.getAddr32(x, y) = blur_pixel(src, x, y, kernel.get(), wh);
         }
     }
 
     return dst;
 }
 
 }  // namespace sk_tool_utils