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 */
21class GrTextureAdjuster : public GrTextureProducer {
22public:
23    std::unique_ptr<GrFragmentProcessor> createFragmentProcessor(
24            const SkMatrix& textureMatrix,
25            const SkRect& constraintRect,
26            FilterConstraint,
27            bool coordsLimitedToConstraintRect,
28            const GrSamplerState::Filter* filterOrNullForBicubic,
29            SkColorSpace* dstColorSpace) override;
30
31    // We do not ref the texture nor the colorspace, so the caller must keep them in scope while
32    // this Adjuster is alive.
33    GrTextureAdjuster(GrContext*, sk_sp<GrTextureProxy>, SkAlphaType, uint32_t uniqueID,
34                      SkColorSpace*);
35
36protected:
37    SkAlphaType alphaType() const override { return fAlphaType; }
38    void makeCopyKey(const CopyParams& params, GrUniqueKey* copyKey,
39                     SkColorSpace* dstColorSpace) override;
40    void didCacheCopy(const GrUniqueKey& copyKey) override;
41
42    GrTextureProxy* originalProxy() const { return fOriginal.get(); }
43    sk_sp<GrTextureProxy> originalProxyRef() const { return fOriginal; }
44
45private:
46    sk_sp<GrTextureProxy> onRefTextureProxyForParams(const GrSamplerState&,
47                                                     SkColorSpace* dstColorSpace,
48                                                     sk_sp<SkColorSpace>* proxyColorSpace,
49                                                     SkScalar scaleAdjust[2]) override;
50
51    sk_sp<GrTextureProxy> refTextureProxyCopy(const CopyParams& copyParams, bool willBeMipped);
52
53    GrContext*            fContext;
54    sk_sp<GrTextureProxy> fOriginal;
55    SkAlphaType           fAlphaType;
56    SkColorSpace*         fColorSpace;
57    uint32_t              fUniqueID;
58
59    typedef GrTextureProducer INHERITED;
60};
61
62#endif
63