Add GrColorSpaceXformEffect

This is an FP that just applies a GrColorSpaceXform. I have a long string
of follow-up changes that use this, which greatly simplifies many other
FPs, and ultimately eliminates the need for color space xforms to be a
first-class type in SkSL.

Bug: skia:
Change-Id: I070d8bab81c9a620a2173c83b0013c63ad53bc8e
Reviewed-on: https://skia-review.googlesource.com/60726
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/src/gpu/GrColorSpaceXform.h b/src/gpu/GrColorSpaceXform.h
index 68cd3b0563..b871563387 100644
--- a/src/gpu/GrColorSpaceXform.h
+++ b/src/gpu/GrColorSpaceXform.h
@@ -9,6 +9,7 @@
 #define GrColorSpaceXform_DEFINED
 
 #include "GrColor.h"
+#include "GrFragmentProcessor.h"
 #include "SkMatrix44.h"
 #include "SkRefCnt.h"
 
@@ -42,4 +43,34 @@ private:
     SkMatrix44 fSrcToDst;
 };
 
+class GrColorSpaceXformEffect : public GrFragmentProcessor {
+public:
+    /**
+     *  Returns a fragment processor that calls the passed in fragment processor, and then converts
+     *  the color space of the output from src to dst.
+     */
+    static std::unique_ptr<GrFragmentProcessor> Make(std::unique_ptr<GrFragmentProcessor> child,
+                                                     const SkColorSpace* src,
+                                                     const SkColorSpace* dst);
+
+    const char* name() const override { return "ColorSpaceXform"; }
+    std::unique_ptr<GrFragmentProcessor> clone() const override;
+
+    const GrColorSpaceXform* colorXform() const { return fColorXform.get(); }
+
+private:
+    GrColorSpaceXformEffect(std::unique_ptr<GrFragmentProcessor> child,
+                            sk_sp<GrColorSpaceXform> colorXform);
+
+    static OptimizationFlags OptFlags(const GrFragmentProcessor* child);
+
+    GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
+    void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override;
+    bool onIsEqual(const GrFragmentProcessor&) const override;
+
+    sk_sp<GrColorSpaceXform> fColorXform;
+
+    typedef GrFragmentProcessor INHERITED;
+};
+
 #endif