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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkBlurMaskFilter_DEFINED
#define SkBlurMaskFilter_DEFINED
// we include this since our callers will need to at least be able to ref/unref
#include "SkMaskFilter.h"
#include "SkScalar.h"
#include "SkBlurTypes.h"
class SK_API SkBlurMaskFilter {
public:
/**
* If radius > 0, return the corresponding sigma, else return 0. Use this to convert from the
* (legacy) idea of specify the blur "radius" to the standard notion of specifying its sigma.
*/
static SkScalar ConvertRadiusToSigma(SkScalar radius);
enum BlurFlags {
kNone_BlurFlag = 0x00,
/** The blur layer's radius is not affected by transforms */
kIgnoreTransform_BlurFlag = 0x01,
/** Use a smother, higher qulity blur algorithm */
kHighQuality_BlurFlag = 0x02,
/** mask for all blur flags */
kAll_BlurFlag = 0x03
};
/** Create a blur maskfilter.
* @param style The SkBlurStyle to use
* @param sigma Standard deviation of the Gaussian blur to apply. Must be > 0.
* @param flags Flags to use - defaults to none
* @return The new blur maskfilter
*/
static sk_sp<SkMaskFilter> Make(SkBlurStyle style, SkScalar sigma,
uint32_t flags = kNone_BlurFlag);
/** Create an emboss maskfilter
@param blurSigma standard deviation of the Gaussian blur to apply
before applying lighting (e.g. 3)
@param direction array of 3 scalars [x, y, z] specifying the direction of the light source
@param ambient 0...1 amount of ambient light
@param specular coefficient for specular highlights (e.g. 8)
@return the emboss maskfilter
*/
static sk_sp<SkMaskFilter> MakeEmboss(SkScalar blurSigma, const SkScalar direction[3],
SkScalar ambient, SkScalar specular);
#ifdef SK_SUPPORT_LEGACY_MASKFILTER_PTR
static SkMaskFilter* Create(SkBlurStyle style, SkScalar sigma, uint32_t flags = kNone_BlurFlag){
return Make(style, sigma, flags).release();
}
static SkMaskFilter* CreateEmboss(SkScalar blurSigma, const SkScalar direction[3],
SkScalar ambient, SkScalar specular) {
return MakeEmboss(blurSigma, direction, ambient, specular).release();
}
SK_ATTR_DEPRECATED("use sigma version")
static SkMaskFilter* CreateEmboss(const SkScalar direction[3],
SkScalar ambient, SkScalar specular,
SkScalar blurRadius);
#endif
SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP()
private:
SkBlurMaskFilter(); // can't be instantiated
};
#endif
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