1 /*
2  * Copyright 2016 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #ifndef GrTextureAdjuster_DEFINED
9 #define GrTextureAdjuster_DEFINED
10 
11 #include "GrTextureProducer.h"
12 #include "GrTextureProxy.h"
13 #include "SkTLazy.h"
14 
15 /**
16  * Base class for sources that start out as textures. Optionally allows for a content area subrect.
17  * The intent is not to use content area for subrect rendering. Rather, the pixels outside the
18  * content area have undefined values and shouldn't be read *regardless* of filtering mode or
19  * the SkCanvas::SrcRectConstraint used for subrect draws.
20  */
21 class GrTextureAdjuster : public GrTextureProducer {
22 public:
23     std::unique_ptr<GrFragmentProcessor> createFragmentProcessor(
24             const SkMatrix& textureMatrix,
25             const SkRect& constraintRect,
26             FilterConstraint,
27             bool coordsLimitedToConstraintRect,
28             const GrSamplerState::Filter* filterOrNullForBicubic) override;
29 
30     // We do not ref the texture nor the colorspace, so the caller must keep them in scope while
31     // this Adjuster is alive.
32     GrTextureAdjuster(GrContext*, sk_sp<GrTextureProxy>, SkAlphaType, uint32_t uniqueID,
33                       SkColorSpace*);
34 
35 protected:
alphaType()36     SkAlphaType alphaType() const override { return fAlphaType; }
colorSpace()37     SkColorSpace* colorSpace() const override { return fColorSpace; }
38     void makeCopyKey(const CopyParams& params, GrUniqueKey* copyKey) override;
39     void didCacheCopy(const GrUniqueKey& copyKey, uint32_t contextUniqueID) override;
40 
originalProxy()41     GrTextureProxy* originalProxy() const { return fOriginal.get(); }
originalProxyRef()42     sk_sp<GrTextureProxy> originalProxyRef() const { return fOriginal; }
43 
44 private:
45     sk_sp<GrTextureProxy> onRefTextureProxyForParams(const GrSamplerState&,
46                                                      bool willBeMipped,
47                                                      SkScalar scaleAdjust[2]) override;
48 
49     sk_sp<GrTextureProxy> refTextureProxyCopy(const CopyParams& copyParams, bool willBeMipped);
50 
51     sk_sp<GrTextureProxy> fOriginal;
52     SkAlphaType           fAlphaType;
53     SkColorSpace*         fColorSpace;
54     uint32_t              fUniqueID;
55 
56     typedef GrTextureProducer INHERITED;
57 };
58 
59 #endif
60