Add SkSpecialImage & SkSpecialSurface classes

tests/SpecialImageTest.cpp

Index: tests/SpecialImageTest.cpp
diff --git a/tests/SpecialImageTest.cpp b/tests/SpecialImageTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..0680a4292afe5802c041d6f66de240881fb19101
--- /dev/null
+++ b/tests/SpecialImageTest.cpp
@@ -0,0 +1,120 @@
+/*
+ * 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 "SkBitmap.h"
+#include "SkCanvas.h"
+#include "SkImage.h"
+#include "SkSpecialImage.h"
+#include "SkSpecialSurface.h"
+#include "Test.h"
+
+#if SK_SUPPORT_GPU
+#include "GrContext.h"
+#endif
+
+static const int kFullWidthHeight    = 16;
+static const int kSmallerWidthHeight = 10;
+
+// Create a bitmap with red in the upper-left corner and green everywhere else
+static SkBitmap create_bm() {
+    SkBitmap bm;
+    bm.allocN32Pixels(kFullWidthHeight, kFullWidthHeight, true);
+
+    SkCanvas temp(bm);
+
+    temp.clear(SK_ColorGREEN);
+    SkPaint p;
+    p.setColor(SK_ColorRED);
+    p.setAntiAlias(false);
+
+    temp.drawRect(SkRect::MakeIWH(kSmallerWidthHeight, kSmallerWidthHeight), p);
+
+    return bm;
+}
+
+// Basic test of the SkSpecialImage public API (e.g., peekTexture, peekPixels & draw)
+static void test_image(SkSpecialImage* img, skiatest::Reporter* reporter,
+                       bool peekPixelsSucceeds, bool peekTextureSucceeds) {
+    REPORTER_ASSERT(reporter, kSmallerWidthHeight == img->width());
+    REPORTER_ASSERT(reporter, kSmallerWidthHeight == img->height());
+
+    //--------------
+    REPORTER_ASSERT(reporter, peekTextureSucceeds == !!img->peekTexture());
+
+    //--------------
+    SkImageInfo info;
+    size_t rowBytes;
+    REPORTER_ASSERT(reporter, peekPixelsSucceeds == !!img->peekPixels(&info, &rowBytes));
+    if (peekPixelsSucceeds) {
+        REPORTER_ASSERT(reporter, kFullWidthHeight == info.width());
+        REPORTER_ASSERT(reporter, kFullWidthHeight == info.height());
+    }
+
+    //--------------
+    info = SkImageInfo::MakeN32(kFullWidthHeight, kFullWidthHeight, kOpaque_SkAlphaType);
+
+    SkAutoTUnref<SkSpecialSurface> surf(img->newSurface(info));
+
+    SkCanvas* canvas = surf->getCanvas();
+
+    canvas->clear(SK_ColorBLUE);
+    img->draw(canvas, 0, 0, nullptr);
+
+    SkBitmap bm;
+    bm.allocN32Pixels(kFullWidthHeight, kFullWidthHeight, true);
+
+    bool result = canvas->readPixels(bm.info(), bm.getPixels(), bm.rowBytes(), 0, 0);
+    SK_ALWAYSBREAK(result);
+
+    // Only the upper-left corner should've been drawn into the canvas
+    REPORTER_ASSERT(reporter, SK_ColorRED == bm.getColor(kSmallerWidthHeight-1,
+                                                         kSmallerWidthHeight-1));
+    REPORTER_ASSERT(reporter, SK_ColorBLUE == bm.getColor(kSmallerWidthHeight,
+                                                           kSmallerWidthHeight));
+}
+
+DEF_TEST(SpecialImage_Raster, reporter) {
+    SkBitmap bm = create_bm();
+
+    SkAutoTUnref<SkSpecialImage> img(SkSpecialImage::New(kSmallerWidthHeight, kSmallerWidthHeight,
+                                                         bm));
+    test_image(img, reporter, true, false);
+}
+
+DEF_TEST(SpecialImage_Image, reporter) {
+    SkBitmap bm = create_bm();
+
+    SkAutoTUnref<SkImage> fullImage(SkImage::NewFromBitmap(bm));
+
+    SkAutoTUnref<SkSpecialImage> img(SkSpecialImage::New(kSmallerWidthHeight, kSmallerWidthHeight,
+                                                         fullImage));
+
+    test_image(img, reporter, true, false);
+}
+
+#if SK_SUPPORT_GPU
+DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialImage_Gpu, reporter, context) {
+    SkBitmap bm = create_bm();
+
+    GrSurfaceDesc desc;
+    desc.fConfig = kSkia8888_GrPixelConfig;
+    desc.fFlags  = kNone_GrSurfaceFlags;
+    desc.fWidth  = kFullWidthHeight;
+    desc.fHeight = kFullWidthHeight;
+
+    SkAutoTUnref<GrTexture> texture(context->textureProvider()->createTexture(desc, false,
+                                                                              bm.getPixels(), 0));
+    if (!texture) {
+        return;
+    }
+
+    SkAutoTUnref<SkSpecialImage> img(SkSpecialImage::New(kSmallerWidthHeight, kSmallerWidthHeight,
+                                                         texture));
+    test_image(img, reporter, false, true);
+}
+
+#endif