1 /*
2  * Copyright 2016 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #ifndef GrColorSpaceXform_DEFINED
9 #define GrColorSpaceXform_DEFINED
10 
11 #include "GrColor.h"
12 #include "SkMatrix44.h"
13 #include "SkRefCnt.h"
14 
15 class SkColorSpace;
16 
17  /**
18   * Represents a color gamut transformation (as a 4x4 color matrix)
19   */
20 class GrColorSpaceXform : public SkRefCnt {
21 public:
22     GrColorSpaceXform(const SkMatrix44& srcToDst);
23 
24     static sk_sp<GrColorSpaceXform> Make(const SkColorSpace* src, const SkColorSpace* dst);
25 
srcToDst()26     const SkMatrix44& srcToDst() const { return fSrcToDst; }
27 
28     /**
29      * GrGLSLFragmentProcessor::GenKey() must call this and include the returned value in its
30      * computed key.
31      */
XformKey(const GrColorSpaceXform * xform)32     static uint32_t XformKey(const GrColorSpaceXform* xform) {
33         // Code generation changes if there is an xform, but it otherwise constant
34         return SkToBool(xform) ? 1 : 0;
35     }
36 
37     static bool Equals(const GrColorSpaceXform* a, const GrColorSpaceXform* b);
38 
39     GrColor4f apply(const GrColor4f& srcColor);
40 
41 private:
42     SkMatrix44 fSrcToDst;
43 };
44 
45 #endif
46