[Reland] Relocate shaders to own dir

Consolidate all shader impls under src/shaders/.

(reland of https://skia-review.googlesource.com/c/17927/)

Change-Id: I7918bdc1aafe842ed194412ba95b9ae53a2ec1d7
Reviewed-on: https://skia-review.googlesource.com/18146
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>

1 files changed, 60 insertions, 0 deletions

diff --git a/src/shaders/SkColorFilterShader.h b/src/shaders/SkColorFilterShader.h
new file mode 100644
index 0000000000..7f4202158a
--- /dev/null
+++ b/src/shaders/SkColorFilterShader.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkColorFilterShader_DEFINED
+#define SkColorFilterShader_DEFINED
+
+#include "SkColorFilter.h"
+#include "SkShaderBase.h"
+
+class SkArenaAlloc;
+
+class SkColorFilterShader : public SkShaderBase {
+public:
+    SkColorFilterShader(sk_sp<SkShader> shader, sk_sp<SkColorFilter> filter);
+
+#if SK_SUPPORT_GPU
+    sk_sp<GrFragmentProcessor> asFragmentProcessor(const AsFPArgs&) const override;
+#endif
+
+    class FilterShaderContext : public Context {
+    public:
+        // Takes ownership of shaderContext and calls its destructor.
+        FilterShaderContext(const SkColorFilterShader&, SkShaderBase::Context*, const ContextRec&);
+
+        uint32_t getFlags() const override;
+
+        void shadeSpan(int x, int y, SkPMColor[], int count) override;
+        void shadeSpan4f(int x, int y, SkPM4f[], int count) override;
+
+        void set3DMask(const SkMask* mask) override {
+            // forward to our proxy
+            fShaderContext->set3DMask(mask);
+        }
+
+    private:
+        SkShaderBase::Context* fShaderContext;
+
+        typedef Context INHERITED;
+    };
+
+    SK_TO_STRING_OVERRIDE()
+    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkColorFilterShader)
+
+protected:
+    void flatten(SkWriteBuffer&) const override;
+    Context* onMakeContext(const ContextRec&, SkArenaAlloc* alloc) const override;
+    sk_sp<SkShader> onMakeColorSpace(SkColorSpaceXformer* xformer) const override;
+
+private:
+    sk_sp<SkShader>      fShader;
+    sk_sp<SkColorFilter> fFilter;
+
+    typedef SkShaderBase INHERITED;
+};
+
+#endif