[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, 79 insertions, 0 deletions

diff --git a/src/shaders/SkPictureShader.h b/src/shaders/SkPictureShader.h
new file mode 100644
index 0000000000..f7a509f181
--- /dev/null
+++ b/src/shaders/SkPictureShader.h
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkPictureShader_DEFINED
+#define SkPictureShader_DEFINED
+
+#include "SkShaderBase.h"
+
+class SkArenaAlloc;
+class SkBitmap;
+class SkPicture;
+
+/*
+ * An SkPictureShader can be used to draw SkPicture-based patterns.
+ *
+ * The SkPicture is first rendered into a tile, which is then used to shade the area according
+ * to specified tiling rules.
+ */
+class SkPictureShader : public SkShaderBase {
+public:
+    static sk_sp<SkShader> Make(sk_sp<SkPicture>, TileMode, TileMode, const SkMatrix*,
+                                const SkRect*);
+
+    SK_TO_STRING_OVERRIDE()
+    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPictureShader)
+
+#if SK_SUPPORT_GPU
+    sk_sp<GrFragmentProcessor> asFragmentProcessor(const AsFPArgs&) const override;
+#endif
+
+protected:
+    SkPictureShader(SkReadBuffer&);
+    void flatten(SkWriteBuffer&) const override;
+    bool onAppendStages(SkRasterPipeline*, SkColorSpace*, SkArenaAlloc*,
+                        const SkMatrix&, const SkPaint&, const SkMatrix*) const override;
+    Context* onMakeContext(const ContextRec&, SkArenaAlloc*) const override;
+    sk_sp<SkShader> onMakeColorSpace(SkColorSpaceXformer* xformer) const override;
+
+private:
+    SkPictureShader(sk_sp<SkPicture>, TileMode, TileMode, const SkMatrix*, const SkRect*,
+                    sk_sp<SkColorSpace>);
+
+    sk_sp<SkShader> refBitmapShader(const SkMatrix&, const SkMatrix* localMatrix,
+                                    SkColorSpace* dstColorSpace,
+                                    const int maxTextureSize = 0) const;
+
+    sk_sp<SkPicture>    fPicture;
+    SkRect              fTile;
+    TileMode            fTmx, fTmy;
+
+    class PictureShaderContext : public Context {
+    public:
+        PictureShaderContext(
+            const SkPictureShader&, const ContextRec&, sk_sp<SkShader> bitmapShader, SkArenaAlloc*);
+
+        uint32_t getFlags() const override;
+
+        ShadeProc asAShadeProc(void** ctx) override;
+        void shadeSpan(int x, int y, SkPMColor dstC[], int count) override;
+
+        sk_sp<SkShader>         fBitmapShader;
+        SkShaderBase::Context*  fBitmapShaderContext;
+        void*                   fBitmapShaderContextStorage;
+
+        typedef Context INHERITED;
+    };
+
+    // Should never be set by a public constructor.  This is only used when onMakeColorSpace()
+    // forces a deferred color space xform.
+    sk_sp<SkColorSpace>   fColorSpace;
+
+    typedef SkShaderBase INHERITED;
+};
+
+#endif // SkPictureShader_DEFINED