ARM Skia NEON patches - 28 - Xfermode: SIMD modeprocs

src/core/SkXfermode_proccoeff.h

+#ifndef SkXfermode_proccoeff_DEFINED
+#define SkXfermode_proccoeff_DEFINED
+
+#include "SkXfermode.h"
+#include "SkFlattenableBuffers.h"
+
+struct ProcCoeff {
+    SkXfermodeProc      fProc;
+    SkXfermode::Coeff   fSC;
+    SkXfermode::Coeff   fDC;
+};
+
+#define CANNOT_USE_COEFF    SkXfermode::Coeff(-1)
+
+extern  const ProcCoeff gProcCoeffs[];
+
+class SkProcCoeffXfermode : public SkProcXfermode {
+public:
+    SkProcCoeffXfermode(const ProcCoeff& rec, Mode mode)
+            : INHERITED(rec.fProc) {
+        fMode = mode;
+        // these may be valid, or may be CANNOT_USE_COEFF
+        fSrcCoeff = rec.fSC;
+        fDstCoeff = rec.fDC;
+    }
+
+    virtual bool asMode(Mode* mode) const SK_OVERRIDE;
+
+    virtual bool asCoeff(Coeff* sc, Coeff* dc) const SK_OVERRIDE;
+
+#if SK_SUPPORT_GPU
+    virtual bool asNewEffectOrCoeff(GrContext*,
+                                    GrEffectRef** effect,
+                                    Coeff* src,
+                                    Coeff* dst,
+                                    GrTexture* background) const SK_OVERRIDE;
+#endif
+
+    SK_DEVELOPER_TO_STRING()
+    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkProcCoeffXfermode)
+
+protected:
+    SkProcCoeffXfermode(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
+        fMode = (SkXfermode::Mode)buffer.read32();
+
+        const ProcCoeff& rec = gProcCoeffs[fMode];
+        // these may be valid, or may be CANNOT_USE_COEFF
+        fSrcCoeff = rec.fSC;
+        fDstCoeff = rec.fDC;
+        // now update our function-ptr in the super class
+        this->INHERITED::setProc(rec.fProc);
+    }
+
+    virtual void flatten(SkFlattenableWriteBuffer& buffer) const SK_OVERRIDE;
+
+private:
+    Mode    fMode;
+    Coeff   fSrcCoeff, fDstCoeff;
+
+    typedef SkProcXfermode INHERITED;
+};
+
+#endif // #ifndef SkXfermode_proccoeff_DEFINED