Fix 4444 on Vulkan devices who don't support RGBA_4444

tests/PackedConfigsTextureTest.cpp

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/*
+ * This is a straightforward test of using packed pixel configs (4444, 565).
+ * This test will make sure that these RGBA_4444 and RGB_565 are always supported
+ * as valid texturing configs.
+ */
+
+#include "Test.h"
+
+#if SK_SUPPORT_GPU
+#include "GrContext.h"
+#include "GrTexture.h"
+
+static const int DEV_W = 100, DEV_H = 100;
+static const SkIRect DEV_RECT = SkIRect::MakeWH(DEV_W, DEV_H);
+
+template <typename T>
+void runTest(skiatest::Reporter* reporter, GrContext* context,
+             T val1, T val2, int arraySize, GrPixelConfig config) {
+    SkTDArray<T> controlPixelData, readBuffer;
+    controlPixelData.setCount(arraySize);
+    readBuffer.setCount(arraySize);
+
+    for (int i = 0; i < arraySize; i += 2) {
+        controlPixelData[i] = val1;
+        controlPixelData[i + 1] = val2;
+    }
+
+    for (int origin = 0; origin < 2; ++origin) {
+        GrSurfaceDesc desc;
+        desc.fFlags = kNone_GrSurfaceFlags;
+        desc.fWidth = DEV_W;
+        desc.fHeight = DEV_H;
+        desc.fConfig = config;
+        desc.fOrigin = 0 == origin ?
+            kTopLeft_GrSurfaceOrigin : kBottomLeft_GrSurfaceOrigin;
+        SkAutoTUnref<GrTexture> fpTexture(context->textureProvider()->createTexture(
+            desc, SkBudgeted::kNo, controlPixelData.begin(), 0));
+        SkASSERT(fpTexture);
+        fpTexture->readPixels(0, 0, DEV_W, DEV_H, desc.fConfig, readBuffer.begin(), 0);
+        REPORTER_ASSERT(reporter,
+                        0 == memcmp(readBuffer.begin(), controlPixelData.begin(),
+                                    readBuffer.bytes()));
+    }
+}
+
+static const int CONTROL_ARRAY_SIZE = DEV_W * DEV_H;
+
+DEF_GPUTEST_FOR_RENDERING_CONTEXTS(RGBA4444TextureTest, reporter, ctxInfo) {
+    runTest<uint16_t>(reporter, ctxInfo.grContext(), 0xFF00, 0xFA62,
+                      CONTROL_ARRAY_SIZE, kRGBA_4444_GrPixelConfig);
+}
+
+DEF_GPUTEST_FOR_RENDERING_CONTEXTS(RGB565TextureTest, reporter, ctxInfo) {
+    runTest<uint16_t>(reporter, ctxInfo.grContext(), 0xFF00, 0xFA62,
+                      CONTROL_ARRAY_SIZE, kRGB_565_GrPixelConfig);
+}
+
+#endif