Revert "Revert "WIP: Skia support library for ICC tasks""

This reverts commit eb733fbf56538838a36814c75cd03f917462cb22.

Reason for revert: Revert patch was automatically merged incorrectly?

Original change's description:
> Revert "WIP: Skia support library for ICC tasks"
> 
> This reverts commit fc8dc3194acb959ee5980b41766660ca0644bcab.
> 
> Reason for revert: Breaks Build-Mac-Clang-Arm7-{Debug,Release}-iOS builds.
> Example tasks:
> * https://chromium-swarm.appspot.com/task?id=3322f668620b9e10&refresh=10
> * https://chromium-swarm.appspot.com/task?id=332296146331e810&refresh=10
> 
> Original change's description:
> > 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>
> > 
> 
> TBR=mtklein@google.com,msarett@google.com,brianosman@google.com,reed@google.com,reviews@skia.org
> BUG=skia:
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> 
> Change-Id: Ibdf272fce25892402bd3e85595fb8814cdf59856
> Reviewed-on: https://skia-review.googlesource.com/6232
> Commit-Queue: Ravi Mistry <rmistry@google.com>
> Reviewed-by: Ravi Mistry <rmistry@google.com>
> 

TBR=mtklein@google.com,rmistry@google.com,msarett@google.com,reviews@skia.org,brianosman@google.com,reed@google.com
BUG=skia:
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I68b1624cfab8adfe31b17e1193a7766507dec8b0
Reviewed-on: https://skia-review.googlesource.com/6233
Commit-Queue: Ravi Mistry <rmistry@google.com>
Reviewed-by: Ravi Mistry <rmistry@google.com>

1 files changed, 73 insertions, 0 deletions

diff --git a/include/core/SkICC.h b/include/core/SkICC.h
new file mode 100644
index 0000000000..3780498df9
--- /dev/null
+++ b/include/core/SkICC.h
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkICC_DEFINED
+#define SkICC_DEFINED
+
+#include "SkRefCnt.h"
+
+struct SkColorSpaceTransferFn;
+class SkColorSpace;
+class SkData;
+class SkMatrix44;
+
+class SK_API SkICC : public SkRefCnt {
+public:
+
+    /**
+     *  Parse an ICC profile.
+     *
+     *  Returns nullptr if the data is not a valid ICC profile or if the profile
+     *  input space is not RGB.
+     */
+    static sk_sp<SkICC> Make(const void*, size_t);
+
+    /**
+     *  If the gamut can be represented as transformation into XYZ D50, returns
+     *  true and sets the proper values in |toXYZD50|.
+     *
+     *  If not, returns false.  This indicates that the ICC data is too complex
+     *  to isolate a simple gamut transformation.
+     */
+    bool toXYZD50(SkMatrix44* toXYZD50) const;
+
+    /**
+     *  If the transfer function can be represented as coefficients to the standard
+     *  equation, returns true and sets |fn| to the proper values.
+     *
+     *  If not, returns false.  This indicates one of the following:
+     *  (1) The R, G, and B transfer functions are not the same.
+     *  (2) The transfer function is represented as a table that we have not managed
+     *      to match to a standard curve.
+     *  (3) The ICC data is too complex to isolate a single transfer function.
+     */
+    bool isNumericalTransferFn(SkColorSpaceTransferFn* fn) const;
+
+    /**
+     *  If the transfer function can be approximated as coefficients to the standard
+     *  equation, returns true and sets |fn| to the proper values.
+     *
+     *  If not, returns false.  This indicates one of the following:
+     *  (1) The R, G, and B transfer functions are not the same.
+     *  (2) The transfer function is represented as a table that is not increasing with
+     *      end points at zero and one.
+     *  (3) The ICC data is too complex to isolate a single transfer function.
+     */
+    bool approximateNumericalTransferFn(SkColorSpaceTransferFn* fn) const;
+
+    /**
+     *  Write an ICC profile with transfer function |fn| and gamut |toXYZD50|.
+     */
+    static sk_sp<SkData> WriteToICC(const SkColorSpaceTransferFn& fn, const SkMatrix44& toXYZD50);
+
+private:
+    SkICC(sk_sp<SkColorSpace> colorSpace);
+
+    sk_sp<SkColorSpace> fColorSpace;
+};
+
+#endif