[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, 93 insertions, 0 deletions

diff --git a/src/shaders/gradients/SkTwoPointConicalGradient.h b/src/shaders/gradients/SkTwoPointConicalGradient.h
new file mode 100644
index 0000000000..b32f52c1e0
--- /dev/null
+++ b/src/shaders/gradients/SkTwoPointConicalGradient.h
@@ -0,0 +1,93 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkTwoPointConicalGradient_DEFINED
+#define SkTwoPointConicalGradient_DEFINED
+
+#include "SkColorSpaceXformer.h"
+#include "SkGradientShaderPriv.h"
+
+// TODO(dominikg): Worth making it truly immutable (i.e. set values in constructor)?
+// Should only be initialized once via init(). Immutable afterwards.
+struct TwoPtRadial {
+    enum {
+        // This value is outside the range SK_FixedMin to SK_FixedMax.
+        kDontDrawT  = 0x80000000
+    };
+
+    float   fCenterX, fCenterY;
+    float   fDCenterX, fDCenterY;
+    float   fRadius;
+    float   fDRadius;
+    float   fA;
+    float   fRadius2;
+    float   fRDR;
+    bool    fFlipped;
+
+    void init(const SkPoint& center0, SkScalar rad0,
+              const SkPoint& center1, SkScalar rad1,
+              bool flipped);
+
+    static bool DontDrawT(SkFixed t) {
+        return kDontDrawT == (uint32_t)t;
+    }
+};
+
+
+class SkTwoPointConicalGradient : public SkGradientShaderBase {
+    TwoPtRadial fRec;
+public:
+    SkTwoPointConicalGradient(const SkPoint& start, SkScalar startRadius,
+                              const SkPoint& end, SkScalar endRadius,
+                              bool flippedGrad, const Descriptor&);
+
+    class TwoPointConicalGradientContext : public SkGradientShaderBase::GradientShaderBaseContext {
+    public:
+        TwoPointConicalGradientContext(const SkTwoPointConicalGradient&, const ContextRec&);
+        ~TwoPointConicalGradientContext() override {}
+
+        void shadeSpan(int x, int y, SkPMColor dstC[], int count) override;
+
+    private:
+        typedef SkGradientShaderBase::GradientShaderBaseContext INHERITED;
+    };
+
+    SkShader::GradientType asAGradient(GradientInfo* info) const  override;
+#if SK_SUPPORT_GPU
+    sk_sp<GrFragmentProcessor> asFragmentProcessor(const AsFPArgs&) const override;
+#endif
+    bool isOpaque() const override;
+
+    SkScalar getCenterX1() const { return SkPoint::Distance(fCenter1, fCenter2); }
+    SkScalar getStartRadius() const { return fRadius1; }
+    SkScalar getDiffRadius() const { return fRadius2 - fRadius1; }
+    const SkPoint& getStartCenter() const { return fCenter1; }
+    const SkPoint& getEndCenter() const { return fCenter2; }
+    SkScalar getEndRadius() const { return fRadius2; }
+    bool isFlippedGrad() const { return fFlippedGrad; }
+
+    SK_TO_STRING_OVERRIDE()
+    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTwoPointConicalGradient)
+
+protected:
+    SkTwoPointConicalGradient(SkReadBuffer& buffer);
+    void flatten(SkWriteBuffer& buffer) const override;
+    Context* onMakeContext(const ContextRec&, SkArenaAlloc*) const override;
+    sk_sp<SkShader> onMakeColorSpace(SkColorSpaceXformer* xformer) const override;
+
+private:
+    SkPoint fCenter1;
+    SkPoint fCenter2;
+    SkScalar fRadius1;
+    SkScalar fRadius2;
+    bool fFlippedGrad;
+
+    friend class SkGradientShader;
+    typedef SkGradientShaderBase INHERITED;
+};
+
+#endif