1 files changed, 78 insertions, 0 deletions
diff --git a/src/gpu/effects/GrConstColorProcessor.h b/src/gpu/effects/GrConstColorProcessor.h
new file mode 100644
index 0000000000..b543aa5069
--- /dev/null
+++ b/src/gpu/effects/GrConstColorProcessor.h
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrColorProcessor_DEFINED
+#define GrColorProcessor_DEFINED
+
+#include "GrFragmentProcessor.h"
+
+/**
+ * This is a simple GrFragmentProcessor that outputs a constant color. It may do one of the
+ * following with its input color: ignore it, or multiply it by the constant color, multiply its
+ * alpha by the constant color and ignore the input color's r, g, and b.
+ */
+class GrConstColorProcessor : public GrFragmentProcessor {
+public:
+    enum InputMode {
+        kIgnore_InputMode,
+        kModulateRGBA_InputMode,
+        kModulateA_InputMode,
+
+        kLastInputMode = kModulateA_InputMode
+    };
+    static const int kInputModeCnt = kLastInputMode + 1;
+
+    static sk_sp<GrFragmentProcessor> Make(GrColor4f color, InputMode mode) {
+        return sk_sp<GrFragmentProcessor>(new GrConstColorProcessor(color, mode));
+    }
+
+    const char* name() const override { return "Color"; }
+
+    SkString dumpInfo() const override {
+        SkString str;
+        str.appendf("Color: 0x%08x", fColor.toGrColor());
+        return str;
+    }
+
+    GrColor4f color() const { return fColor; }
+
+    InputMode inputMode() const { return fMode; }
+
+private:
+    static OptimizationFlags OptFlags(GrColor4f color, InputMode mode) {
+        OptimizationFlags flags = kConstantOutputForConstantInput_OptimizationFlag;
+        if (mode != kIgnore_InputMode) {
+            flags |= kCompatibleWithCoverageAsAlpha_OptimizationFlag;
+        }
+        if (color.isOpaque()) {
+            flags |= kPreservesOpaqueInput_OptimizationFlag;
+        }
+        return flags;
+    }
+
+    GrConstColorProcessor(GrColor4f color, InputMode mode)
+            : INHERITED(OptFlags(color, mode)), fColor(color), fMode(mode) {
+        this->initClassID<GrConstColorProcessor>();
+    }
+
+    GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
+
+    void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override;
+
+    bool onIsEqual(const GrFragmentProcessor&) const override;
+
+    GrColor4f constantOutputForConstantInput(GrColor4f input) const override;
+
+    GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
+
+    GrColor4f   fColor;
+    InputMode   fMode;
+
+    typedef GrFragmentProcessor INHERITED;
+};
+
+#endif