Add SkImageGenerator Interface

tests/CachedDecodingPixelRefTest.cpp

Index: tests/CachedDecodingPixelRefTest.cpp
diff --git a/tests/CachedDecodingPixelRefTest.cpp b/tests/CachedDecodingPixelRefTest.cpp
index 9a005469da3bce52f138d6856fdec40feaae9f76..76882f0e0ded98458d14fc321abd2b72d06faf3c 100644
--- a/tests/CachedDecodingPixelRefTest.cpp
+++ b/tests/CachedDecodingPixelRefTest.cpp
@@ -8,6 +8,7 @@
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkData.h"
+#include "SkDecodingImageGenerator.h"
 #include "SkForceLinking.h"
 #include "SkImageDecoder.h"
 #include "SkImagePriv.h"
@@ -244,3 +245,36 @@ DEF_TEST(CachingPixelRef, reporter) {
     // onDecodePixels should fail, so getting pixels will fail.
     REPORTER_ASSERT(reporter, NULL == lazy.getPixels());
 }
+
+static void compare_with_SkDecodingImageGenerator(skiatest::Reporter* reporter,
+                                                  SkData* encoded,
+                                                  const SkBitmap& original,
+                                                  bool comparePixels) {
+
+    SkBitmap lazy;
+    bool success = SkDecodingImageGenerator::Install(encoded, &lazy);
+    REPORTER_ASSERT(reporter, success);

[scroggo, 2013/11/19 22:19:27]

If success is false, should we return false?

[hal.canary, 2013/11/20 00:07:10]

We should return early, at least.

+
+    bool getPixelsSuccess;
+    REPORTER_ASSERT(reporter, NULL == lazy.getPixels());
+    {
+        SkAutoLockPixels autoLockPixels(lazy);  // now pixels are good.
+        REPORTER_ASSERT(reporter, NULL != lazy.getPixels());
+        getPixelsSuccess = (NULL != lazy.getPixels());
+    }
+    if (!getPixelsSuccess) {
+        return;
+    }
+    // pixels should be gone!
+    REPORTER_ASSERT(reporter, NULL == lazy.getPixels());
+    {
+        SkAutoLockPixels autoLockPixels(lazy);  // now pixels are good.
+        REPORTER_ASSERT(reporter, NULL != lazy.getPixels());
+    }
+    if (getPixelsSuccess) {
+        compare_bitmaps(reporter, original, lazy, comparePixels);
+    }
+}
+DEF_TEST(DecodingImageGenerator, reporter) {
+    test_three_encodings(reporter, compare_with_SkDecodingImageGenerator);
+}