Add SkSpecialImage & SkSpecialSurface classes

tests/SpecialSurfaceTest.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
+*/
+
+#include "SkCanvas.h"
+#include "SkSpecialImage.h"
+#include "SkSpecialSurface.h"
+#include "Test.h"
+
+#if SK_SUPPORT_GPU
+#include "GrContext.h"
+#endif
+
+// This needs to be a non-power-of-2 to exercise the gpu's loose fit behavior
+static const int kWidthHeight = 10;
+
+// Exercise the public API of SkSpecialSurface (e.g., getCanvas, newImageSnapshot)
+static void test_surface(SkSpecialSurface* surf, skiatest::Reporter* reporter) {
+
+    REPORTER_ASSERT(reporter, kWidthHeight == surf->width());
+    REPORTER_ASSERT(reporter, kWidthHeight == surf->height());
+
+    SkCanvas* canvas = surf->getCanvas();
+    SK_ALWAYSBREAK(canvas);
+
+    canvas->clear(SK_ColorRED);
+
+    SkAutoTUnref<SkSpecialImage> img(surf->newImageSnapshot());
+    REPORTER_ASSERT(reporter, img);
+
+    REPORTER_ASSERT(reporter, kWidthHeight == img->width());
+    REPORTER_ASSERT(reporter, kWidthHeight == img->height());
+
+    REPORTER_ASSERT(reporter, !surf->getCanvas());
+}
+
+DEF_TEST(SpecialSurface_Raster, reporter) {
+
+    SkImageInfo info = SkImageInfo::MakeN32(kWidthHeight, kWidthHeight, kOpaque_SkAlphaType);
+    SkAutoTUnref<SkSpecialSurface> surf(SkSpecialSurface::New(info));
+
+    test_surface(surf, reporter);
+}
+
+#if SK_SUPPORT_GPU
+DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialSurface_Gpu, reporter, context) {
+    GrSurfaceDesc desc;
+    desc.fConfig = kSkia8888_GrPixelConfig;
+    desc.fFlags  = kRenderTarget_GrSurfaceFlag;
+    desc.fWidth  = kWidthHeight;
+    desc.fHeight = kWidthHeight;
+
+    SkAutoTUnref<SkSpecialSurface> surf(SkSpecialSurface::New(context, desc));
+
+    test_surface(surf, reporter);
+}
+
+#endif