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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrTextureMaker_DEFINED
#define GrTextureMaker_DEFINED
#include "GrTextureProducer.h"
/**
* Base class for sources that start out as something other than a texture (encoded image,
* picture, ...).
*/
class GrTextureMaker : public GrTextureProducer {
public:
enum class AllowedTexGenType : bool { kCheap, kAny };
/**
* Returns a texture that is safe for use with the params. If the size of the returned texture
* does not match width()/height() then the contents of the original must be scaled to fit
* the texture. Additionally, the 'scaleAdjust' must be applied to the texture matrix
* in order to correct the absolute texture coordinates.
* Places the color space of the texture in (*texColorSpace).
*/
sk_sp<GrTextureProxy> refTextureProxyForParams(const GrSamplerState&,
SkColorSpace* dstColorSpace,
sk_sp<SkColorSpace>* texColorSpace,
SkScalar scaleAdjust[2]);
std::unique_ptr<GrFragmentProcessor> createFragmentProcessor(
const SkMatrix& textureMatrix,
const SkRect& constraintRect,
FilterConstraint filterConstraint,
bool coordsLimitedToConstraintRect,
const GrSamplerState::Filter* filterOrNullForBicubic,
SkColorSpace* dstColorSpace) override;
protected:
GrTextureMaker(GrContext* context, int width, int height, bool isAlphaOnly)
: INHERITED(width, height, isAlphaOnly)
, fContext(context) {}
/**
* Return the maker's "original" texture. It is the responsibility of the maker to handle any
* caching of the original if desired.
* If "genType" argument equals AllowedTexGenType::kCheap and the texture is not trivial to
* construct then refOriginalTextureProxy should return nullptr (for example if texture is made
* by drawing into a render target).
*/
virtual sk_sp<GrTextureProxy> refOriginalTextureProxy(bool willBeMipped,
SkColorSpace* dstColorSpace,
AllowedTexGenType genType) = 0;
/**
* Returns the color space of the maker's "original" texture, assuming it was retrieved with
* the same destination color space.
*/
virtual sk_sp<SkColorSpace> getColorSpace(SkColorSpace* dstColorSpace) = 0;
/**
* Return a new (uncached) texture that is the stretch of the maker's original.
*
* The base-class handles general logic for this, and only needs access to the following
* method:
* - refOriginalTextureProxy()
*
* Subclass may override this if they can handle creating the texture more directly than
* by copying.
*/
virtual sk_sp<GrTextureProxy> generateTextureProxyForParams(const CopyParams&,
bool willBeMipped,
SkColorSpace* dstColorSpace);
GrContext* context() const { return fContext; }
private:
GrContext* fContext;
typedef GrTextureProducer INHERITED;
};
#endif
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