Add SkColorSpaceXform to the public API

tests/ColorSpaceXformTest.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 "Resources.h"
 #include "SkCodec.h"
 #include "SkCodecPriv.h"
 #include "SkColorPriv.h"
 #include "SkColorSpace.h"
 #include "SkColorSpace_Base.h"
-#include "SkColorSpaceXform.h"
+#include "SkColorSpaceXform_Base.h"
 #include "Test.h"
 
 class ColorSpaceXformTest {
 public:
     static std::unique_ptr<SkColorSpaceXform> CreateIdentityXform(const sk_sp<SkGammas>& gammas) {
         // Logically we can pass any matrix here.  For simplicty, pass I(), i.e. D50 XYZ gamut.
         sk_sp<SkColorSpace> space(new SkColorSpace_Base(
                 nullptr, kNonStandard_SkGammaNamed, gammas, SkMatrix::I(), nullptr));
 
         // Use special testing entry point, so we don't skip the xform, even though src == dst.
         return SlowIdentityXform(space.get());
     }
 };
 
 static bool almost_equal(int x, int y) {
     return SkTAbs(x - y) <= 1;
 }
 
 static void test_identity_xform(skiatest::Reporter* r, const sk_sp<SkGammas>& gammas) {
     // Arbitrary set of 10 pixels
     constexpr int width = 10;
     constexpr uint32_t srcPixels[width] = {
             0xFFABCDEF, 0xFF146829, 0xFF382759, 0xFF184968, 0xFFDE8271,
             0xFF32AB52, 0xFF0383BC, 0xFF000102, 0xFFFFFFFF, 0xFFDDEEFF, };
     uint32_t dstPixels[width];
 
     // Create and perform an identity xform.
     std::unique_ptr<SkColorSpaceXform> xform = ColorSpaceXformTest::CreateIdentityXform(gammas);
-    xform->apply(dstPixels, srcPixels, width, select_xform_format(kN32_SkColorType),
-                 SkColorSpaceXform::kBGRA_8888_ColorFormat, kOpaque_SkAlphaType);
+    bool result = xform->apply(select_xform_format(kN32_SkColorType), dstPixels,
+                               SkColorSpaceXform::kBGRA_8888_ColorFormat, srcPixels, width,
+                               kOpaque_SkAlphaType);
+    REPORTER_ASSERT(r, result);
 
     // Since the src->dst matrix is the identity, and the gamma curves match,
     // the pixels should be unchanged.
     for (int i = 0; i < width; i++) {
         REPORTER_ASSERT(r, almost_equal(((srcPixels[i] >>  0) & 0xFF),
                                         SkGetPackedB32(dstPixels[i])));
         REPORTER_ASSERT(r, almost_equal(((srcPixels[i] >>  8) & 0xFF),
                                         SkGetPackedG32(dstPixels[i])));
         REPORTER_ASSERT(r, almost_equal(((srcPixels[i] >> 16) & 0xFF),
                                         SkGetPackedR32(dstPixels[i])));
@@ skipping 120 matching lines @@
     for (uint32_t i = 0; i < len; ++i) {
         src[i] = i;
     }
     // this ICC profile has a CLUT in it
     const SkString filename(GetResourcePath("icc_profiles/upperRight.icc"));
     sk_sp<SkData> iccData = SkData::MakeFromFileName(filename.c_str());
     REPORTER_ASSERT_MESSAGE(r, iccData, "upperRight.icc profile required for test");
     sk_sp<SkColorSpace> srcSpace = SkColorSpace::NewICC(iccData->bytes(), iccData->size());
     sk_sp<SkColorSpace> dstSpace = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named);
     auto xform = SkColorSpaceXform::New(srcSpace.get(), dstSpace.get());
-    xform->apply(dst.get(), src.get(), len, SkColorSpaceXform::kRGBA_8888_ColorFormat,
-                 SkColorSpaceXform::kRGBA_8888_ColorFormat, kUnpremul_SkAlphaType);
+    bool result = xform->apply(SkColorSpaceXform::kRGBA_8888_ColorFormat, dst.get(),
+                               SkColorSpaceXform::kRGBA_8888_ColorFormat, src.get(), len,
+                               kUnpremul_SkAlphaType);
+    REPORTER_ASSERT(r, result);
 }