SkImage::NewFromGenerator(SkImageGenerator*), and a unit test.

tests/CachedDecodingPixelRefTest.cpp

Index: tests/CachedDecodingPixelRefTest.cpp
diff --git a/tests/CachedDecodingPixelRefTest.cpp b/tests/CachedDecodingPixelRefTest.cpp
index 8de7da79a252e54404cd64457dee387234b70f32..b409987392ab36af2e8ea1554f9dfa06048d0d8f 100644
--- a/tests/CachedDecodingPixelRefTest.cpp
+++ b/tests/CachedDecodingPixelRefTest.cpp
@@ -322,3 +322,42 @@ DEF_TEST(DiscardableAndCachingPixelRef, reporter) {
     check_pixelref(TestImageGenerator::kSucceedGetPixels_TestType,
                    reporter, kSkDiscardable_PixelRefType, globalPool);
 }
+
+////////////////////////////////////////////////////////////////////////////////
+
+DEF_TEST(Image_NewFromGenerator, r) {
+    TestImageGenerator::TestType testTypes[] = {
+        TestImageGenerator::kFailGetInfo_TestType,
+        TestImageGenerator::kFailGetPixels_TestType,
+        TestImageGenerator::kSucceedGetPixels_TestType,
+    };
+    for (size_t i = 0; i < SK_ARRAY_COUNT(testTypes); ++i) {
+        TestImageGenerator::TestType test = testTypes[i];
+        SkImageGenerator* gen = SkNEW_ARGS(TestImageGenerator, (test, r));
+        SkAutoTUnref<SkImage> image(SkImage::NewFromGenerator(gen));
+        if (TestImageGenerator::kFailGetInfo_TestType == test) {
+            REPORTER_ASSERT(r, NULL == image.get());
+            continue;
+        }
+        if (NULL == image.get()) {
+            ERRORF(r, "SkImage::NewFromGenerator unexpecedly failed ["
+                   SK_SIZE_T_SPECIFIER "]", i);
+            continue;
+        }
+        REPORTER_ASSERT(r, TestImageGenerator::Width() == image->width());
+        REPORTER_ASSERT(r, TestImageGenerator::Height() == image->height());
+
+        SkBitmap bitmap;
+        SkAssertResult(bitmap.allocN32Pixels(TestImageGenerator::Width(),
+                                             TestImageGenerator::Height()));
+        SkCanvas canvas(bitmap);
+        canvas.clear(SK_ColorMAGENTA);
+        image->draw(&canvas, 0, 0, NULL);
+        SkColor color = bitmap.getColor(0, 0);
+        if (TestImageGenerator::kSucceedGetPixels_TestType == test) {
+            REPORTER_ASSERT(r, TestImageGenerator::Color() == color);
+        } else {
+            REPORTER_ASSERT(r, SK_ColorMAGENTA == color);
+        }
+    }
+}