Move SkColorSpace ICC parsing/writing code to its own file

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2101823003

Review-Url: https://codereview.chromium.org/2101823003

1 files changed, 25 insertions, 0 deletions

diff --git a/src/core/SkColorSpacePriv.h b/src/core/SkColorSpacePriv.h
new file mode 100644
index 0000000000..7c7b9d0c21
--- /dev/null
+++ b/src/core/SkColorSpacePriv.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#define SkColorSpacePrintf(...)
+
+inline bool color_space_almost_equal(float a, float b) {
+    return SkTAbs(a - b) < 0.01f;
+}
+
+inline void set_gamma_value(SkGammaCurve* gamma, float value) {
+    if (color_space_almost_equal(2.2f, value)) {
+        gamma->fNamed = SkColorSpace::k2Dot2Curve_GammaNamed;
+    } else if (color_space_almost_equal(1.0f, value)) {
+        gamma->fNamed = SkColorSpace::kLinear_GammaNamed;
+    } else if (color_space_almost_equal(0.0f, value)) {
+        SkColorSpacePrintf("Treating invalid zero gamma as linear.");
+        gamma->fNamed = SkColorSpace::kLinear_GammaNamed;
+    } else {
+        gamma->fValue = value;
+    }
+}