Reland "Revert "added GrSkSLFP and converted DitherEffect to use it""

This reverts commit 97ae0c89025dfd791047f5701e57d58da37c125c.

Reason for revert: Breaking ANGLE.

Original change's description:
> Revert "Revert "added GrSkSLFP and converted DitherEffect to use it""
> 
> This reverts commit f2030783094e502fb74221077a5ee7cb41287fe4.
> 
> Bug: skia:
> Change-Id: Icaaa8b3ea652a8f126bfbcc788a360493a7ebe3e
> Reviewed-on: https://skia-review.googlesource.com/137391
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>

TBR=bsalomon@google.com,robertphillips@google.com,ethannicholas@google.com

Change-Id: I65d6d2707fceab0a99121c528d1b848d23e34bfa
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/142588
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

1 files changed, 67 insertions, 0 deletions

diff --git a/src/gpu/effects/GrDitherEffect.h b/src/gpu/effects/GrDitherEffect.h
new file mode 100644
index 0000000000..70adc45e6a
--- /dev/null
+++ b/src/gpu/effects/GrDitherEffect.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2018 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/**************************************************************************************************
+ *** This file was autogenerated from GrDitherEffect.fp; do not modify.
+ **************************************************************************************************/
+#ifndef GrDitherEffect_DEFINED
+#define GrDitherEffect_DEFINED
+#include "SkTypes.h"
+#include "GrFragmentProcessor.h"
+#include "GrCoordTransform.h"
+class GrDitherEffect : public GrFragmentProcessor {
+public:
+    int rangeType() const { return fRangeType; }
+
+    static std::unique_ptr<GrFragmentProcessor> Make(GrPixelConfig dstConfig) {
+        int rangeType;
+        switch (dstConfig) {
+            case kGray_8_GrPixelConfig:
+            case kGray_8_as_Lum_GrPixelConfig:
+            case kGray_8_as_Red_GrPixelConfig:
+            case kRGBA_8888_GrPixelConfig:
+            case kRGB_888_GrPixelConfig:
+            case kBGRA_8888_GrPixelConfig:
+                rangeType = 0;
+                break;
+            case kRGB_565_GrPixelConfig:
+                rangeType = 1;
+                break;
+            case kRGBA_4444_GrPixelConfig:
+                rangeType = 2;
+                break;
+            case kUnknown_GrPixelConfig:
+            case kSRGBA_8888_GrPixelConfig:
+            case kSBGRA_8888_GrPixelConfig:
+            case kRGBA_1010102_GrPixelConfig:
+            case kAlpha_half_GrPixelConfig:
+            case kAlpha_half_as_Red_GrPixelConfig:
+            case kRGBA_float_GrPixelConfig:
+            case kRG_float_GrPixelConfig:
+            case kRGBA_half_GrPixelConfig:
+            case kAlpha_8_GrPixelConfig:
+            case kAlpha_8_as_Alpha_GrPixelConfig:
+            case kAlpha_8_as_Red_GrPixelConfig:
+                return nullptr;
+        }
+        return std::unique_ptr<GrFragmentProcessor>(new GrDitherEffect(rangeType));
+    }
+    GrDitherEffect(const GrDitherEffect& src);
+    std::unique_ptr<GrFragmentProcessor> clone() const override;
+    const char* name() const override { return "DitherEffect"; }
+
+private:
+    GrDitherEffect(int rangeType)
+            : INHERITED(kGrDitherEffect_ClassID, kNone_OptimizationFlags), fRangeType(rangeType) {}
+    GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
+    void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override;
+    bool onIsEqual(const GrFragmentProcessor&) const override;
+    GR_DECLARE_FRAGMENT_PROCESSOR_TEST
+    int fRangeType;
+    typedef GrFragmentProcessor INHERITED;
+};
+#endif