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 GrTextureMaker_DEFINED
9 #define GrTextureMaker_DEFINED
10 
11 #include "GrTextureProducer.h"
12 
13 /**
14  * Base class for sources that start out as something other than a texture (encoded image,
15  * picture, ...).
16  */
17 class GrTextureMaker : public GrTextureProducer {
18 public:
19     enum class AllowedTexGenType : bool { kCheap, kAny };
20 
21     std::unique_ptr<GrFragmentProcessor> createFragmentProcessor(
22             const SkMatrix& textureMatrix,
23             const SkRect& constraintRect,
24             FilterConstraint filterConstraint,
25             bool coordsLimitedToConstraintRect,
26             const GrSamplerState::Filter* filterOrNullForBicubic) override;
27 
28 protected:
29     GrTextureMaker(GrContext* context, int width, int height, bool isAlphaOnly)
30         : INHERITED(context, width, height, isAlphaOnly) {}
31 
32     /**
33      *  Return the maker's "original" texture. It is the responsibility of the maker to handle any
34      *  caching of the original if desired.
35      *  If "genType" argument equals AllowedTexGenType::kCheap and the texture is not trivial to
36      *  construct then refOriginalTextureProxy should return nullptr (for example if texture is made
37      *  by drawing into a render target).
38      */
39     virtual sk_sp<GrTextureProxy> refOriginalTextureProxy(bool willBeMipped,
40                                                           AllowedTexGenType genType) = 0;
41 
42     GrContext* context() const { return fContext; }
43 
44 private:
45     sk_sp<GrTextureProxy> onRefTextureProxyForParams(const GrSamplerState&,
46                                                      bool willBeMipped,
47                                                      SkScalar scaleAdjust[2]) override;
48 
49     typedef GrTextureProducer INHERITED;
50 };
51 
52 #endif
53