WIP: Skia support library for ICC tasks

As a starting point, this would be mostly trivial to implement using
SkColorSpace.

This also would give us the flexibility to begin to move all of
the ICC related code from SkColorSpace to SkICC.

What are the advantages of moving this away from SkColorSpace?
(1) A long term goal (once Chrome uses SkCodec), might be to
move SkColorSpace::MakeICC() out of the public API.  That way,
we can guarantee that we can draw to/from *any* SkColorSpace.
(2) Keeps SkColorSpace separate from ICC-specific representations
like SkColorSpaceTransferFn etc.

BUG=skia:

Change-Id: Iddeb9903221fb57fbfc01218d8641c928b4a5165
Reviewed-on: https://skia-review.googlesource.com/5676
Commit-Queue: Matt Sarett <msarett@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Reed <reed@google.com>

1 files changed, 97 insertions, 0 deletions

diff --git a/tests/ICCTest.cpp b/tests/ICCTest.cpp
new file mode 100644
index 0000000000..f4639f0003
--- /dev/null
+++ b/tests/ICCTest.cpp
@@ -0,0 +1,97 @@
+/*
+ * 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 "SkColorSpace.h"
+#include "SkData.h"
+#include "SkICC.h"
+#include "SkMatrix44.h"
+#include "Test.h"
+
+static bool almost_equal(float a, float b) {
+    return SkTAbs(a - b) < 0.001f;
+}
+
+static inline void test_to_xyz_d50(skiatest::Reporter* r, SkICC* icc, bool shouldSucceed,
+                                   const float* reference) {
+    SkMatrix44 result;
+    REPORTER_ASSERT(r, shouldSucceed == icc->toXYZD50(&result));
+    if (shouldSucceed) {
+        float resultVals[16];
+        result.asColMajorf(resultVals);
+        for (int i = 0; i < 16; i++) {
+            REPORTER_ASSERT(r, almost_equal(resultVals[i], reference[i]));
+        }
+    }
+}
+
+DEF_TEST(ICC_ToXYZD50, r) {
+    const float z30Reference[16] = {
+        0.59825f, 0.27103f, 0.00603f, 0.0f, 0.22243f, 0.67447f, 0.07368f, 0.0f, 0.14352f, 0.05449f,
+        0.74519f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f,
+    };
+
+    sk_sp<SkData> data = SkData::MakeFromFileName(
+            GetResourcePath("icc_profiles/HP_ZR30w.icc").c_str());
+    sk_sp<SkICC> z30 = SkICC::Make(data->data(), data->size());
+    test_to_xyz_d50(r, z30.get(), true, z30Reference);
+
+    const float z32Reference[16] = {
+        0.61583f, 0.28789f, 0.00513f, 0.0f, 0.20428f, 0.66972f, 0.06609f, 0.0f, 0.14409f, 0.04237f,
+        0.75368f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f,
+    };
+
+    data = SkData::MakeFromFileName( GetResourcePath("icc_profiles/HP_Z32x.icc").c_str());
+    sk_sp<SkICC> z32 = SkICC::Make(data->data(), data->size());
+    test_to_xyz_d50(r, z32.get(), true, z32Reference);
+
+    data = SkData::MakeFromFileName(GetResourcePath("icc_profiles/upperLeft.icc").c_str());
+    sk_sp<SkICC> upperLeft = SkICC::Make(data->data(), data->size());
+    test_to_xyz_d50(r, upperLeft.get(), false, z32Reference);
+
+    data = SkData::MakeFromFileName(GetResourcePath("icc_profiles/upperRight.icc").c_str());
+    sk_sp<SkICC> upperRight = SkICC::Make(data->data(), data->size());
+    test_to_xyz_d50(r, upperRight.get(), false, z32Reference);
+}
+
+static inline void test_is_numerical_transfer_fn(skiatest::Reporter* r, SkICC* icc,
+                                                 bool shouldSucceed,
+                                                 const SkColorSpaceTransferFn& reference) {
+    SkColorSpaceTransferFn result;
+    REPORTER_ASSERT(r, shouldSucceed == icc->isNumericalTransferFn(&result));
+    if (shouldSucceed) {
+        REPORTER_ASSERT(r, 0 == memcmp(&result, &reference, sizeof(SkColorSpaceTransferFn)));
+    }
+}
+
+DEF_TEST(ICC_IsNumericalTransferFn, r) {
+    SkColorSpaceTransferFn referenceFn;
+    referenceFn.fA = 1.0f;
+    referenceFn.fB = 0.0f;
+    referenceFn.fC = 0.0f;
+    referenceFn.fD = 0.0f;
+    referenceFn.fE = 0.0f;
+    referenceFn.fF = 0.0f;
+    referenceFn.fG = 2.2f;
+
+    sk_sp<SkData> data = SkData::MakeFromFileName(
+            GetResourcePath("icc_profiles/HP_ZR30w.icc").c_str());
+    sk_sp<SkICC> z30 = SkICC::Make(data->data(), data->size());
+    test_is_numerical_transfer_fn(r, z30.get(), true, referenceFn);
+
+    data = SkData::MakeFromFileName( GetResourcePath("icc_profiles/HP_Z32x.icc").c_str());
+    sk_sp<SkICC> z32 = SkICC::Make(data->data(), data->size());
+    test_is_numerical_transfer_fn(r, z32.get(), true, referenceFn);
+
+    data = SkData::MakeFromFileName(GetResourcePath("icc_profiles/upperLeft.icc").c_str());
+    sk_sp<SkICC> upperLeft = SkICC::Make(data->data(), data->size());
+    test_is_numerical_transfer_fn(r, upperLeft.get(), false, referenceFn);
+
+    data = SkData::MakeFromFileName(GetResourcePath("icc_profiles/upperRight.icc").c_str());
+    sk_sp<SkICC> upperRight = SkICC::Make(data->data(), data->size());
+    test_is_numerical_transfer_fn(r, upperRight.get(), false, referenceFn);
+}