minor cleanup to typeface serial test

Bug: skia:
Change-Id: I572fbcbb382a665c4e4e27a7cee718c4eaa7743d
Reviewed-on: https://skia-review.googlesource.com/82801
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/tests/TextBlobTest.cpp b/tests/TextBlobTest.cpp
index f20e3e1..8e272a5 100644
--- a/tests/TextBlobTest.cpp
+++ b/tests/TextBlobTest.cpp
@@ -11,6 +11,7 @@
 #include "SkTypeface.h"
 
 #include "Test.h"
+#include "sk_tool_utils.h"
 
 class TextBlobTester {
 public:
@@ -424,14 +425,15 @@
  *  Then draw the new instance and assert it draws the same as the original.
  */
 DEF_TEST(TextBlob_serialize, reporter) {
-    SkTextBlobBuilder builder;
+    sk_sp<SkTextBlob> blob0 = []() {
+        sk_sp<SkTypeface> tf0;
+        sk_sp<SkTypeface> tf1 = SkTypeface::MakeFromName("Times", SkFontStyle());
 
-    sk_sp<SkTypeface> tf0;
-    sk_sp<SkTypeface> tf1 = SkTypeface::MakeFromName("Times", SkFontStyle());
-
-    add_run(&builder, "Hello", 10, 20, tf0);
-    add_run(&builder, "World", 10, 40, tf1);
-    sk_sp<SkTextBlob> blob0 = builder.make();
+        SkTextBlobBuilder builder;
+        add_run(&builder, "Hello", 10, 20, tf0);
+        add_run(&builder, "World", 10, 40, tf1);
+        return builder.make();
+    }();
 
     SkTDArray<SkTypeface*> array;
     sk_sp<SkData> data = blob0->serialize([](SkTypeface* tf, void* ctx) {
@@ -457,15 +459,6 @@
     sk_sp<SkImage> img0 = render(blob0.get());
     sk_sp<SkImage> img1 = render(blob1.get());
     if (img0 && img1) {
-        REPORTER_ASSERT(reporter, img0->width() == img1->width());
-        REPORTER_ASSERT(reporter, img0->height() == img1->height());
-
-        sk_sp<SkData> enc0 = img0->encodeToData();
-        sk_sp<SkData> enc1 = img1->encodeToData();
-        REPORTER_ASSERT(reporter, enc0->equals(enc1.get()));
-        if (false) {    // in case you want to actually see the images...
-            SkFILEWStream("textblob_serialize_img0.png").write(enc0->data(), enc0->size());
-            SkFILEWStream("textblob_serialize_img1.png").write(enc1->data(), enc1->size());
-        }
+        REPORTER_ASSERT(reporter, sk_tool_utils::equal_pixels(img0.get(), img1.get()));
     }
 }