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      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     /**
     20      *  Returns a texture that is safe for use with the params. If the size of the returned texture
     21      *  does not match width()/height() then the contents of the original must be scaled to fit
     22      *  the texture. Additionally, the 'scaleAdjust' must be applied to the texture matrix
     23      *  in order to correct the absolute texture coordinates.
     24      *  Places the color space of the texture in (*texColorSpace).
     25      */
     26     sk_sp<GrTextureProxy> refTextureProxyForParams(const GrSamplerParams&,
     27                                                    SkColorSpace* dstColorSpace,
     28                                                    sk_sp<SkColorSpace>* texColorSpace,
     29                                                    SkScalar scaleAdjust[2]);
     30 
     31     sk_sp<GrFragmentProcessor> createFragmentProcessor(
     32                                 const SkMatrix& textureMatrix,
     33                                 const SkRect& constraintRect,
     34                                 FilterConstraint filterConstraint,
     35                                 bool coordsLimitedToConstraintRect,
     36                                 const GrSamplerParams::FilterMode* filterOrNullForBicubic,
     37                                 SkColorSpace* dstColorSpace) override;
     38 
     39 protected:
     40     GrTextureMaker(GrContext* context, int width, int height, bool isAlphaOnly)
     41         : INHERITED(width, height, isAlphaOnly)
     42         , fContext(context) {}
     43 
     44     /**
     45      *  Return the maker's "original" texture. It is the responsibility of the maker to handle any
     46      *  caching of the original if desired.
     47      */
     48     virtual sk_sp<GrTextureProxy> refOriginalTextureProxy(bool willBeMipped,
     49                                                           SkColorSpace* dstColorSpace) = 0;
     50 
     51     /**
     52      *  Returns the color space of the maker's "original" texture, assuming it was retrieved with
     53      *  the same destination color space.
     54      */
     55     virtual sk_sp<SkColorSpace> getColorSpace(SkColorSpace* dstColorSpace) = 0;
     56 
     57     /**
     58      *  Return a new (uncached) texture that is the stretch of the maker's original.
     59      *
     60      *  The base-class handles general logic for this, and only needs access to the following
     61      *  method:
     62      *  - refOriginalTextureProxy()
     63      *
     64      *  Subclass may override this if they can handle creating the texture more directly than
     65      *  by copying.
     66      */
     67     virtual sk_sp<GrTextureProxy> generateTextureProxyForParams(const CopyParams&,
     68                                                                 bool willBeMipped,
     69                                                                 SkColorSpace* dstColorSpace);
     70 
     71     GrContext* context() const { return fContext; }
     72 
     73 private:
     74     GrContext*  fContext;
     75 
     76     typedef GrTextureProducer INHERITED;
     77 };
     78 
     79 #endif
     80