SkBlurMask.cpp File Reference

#include "src/core/SkBlurMask.h"
#include "include/core/SkBlurTypes.h"
#include "include/core/SkColorPriv.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/private/base/SkMath.h"
#include "include/private/base/SkSafe32.h"
#include "include/private/base/SkTPin.h"
#include "include/private/base/SkTemplates.h"
#include "include/private/base/SkTo.h"
#include "src/base/SkMathPriv.h"
#include "src/core/SkMaskBlurFilter.h"
#include <cmath>
#include <cstring>
#include <utility>

Go to the source code of this file.

Functions
template<typename AlphaIter >
static void	merge_src_with_blur (uint8_t dst[], int dstRB, AlphaIter src, int srcRB, const uint8_t blur[], int blurRB, int sw, int sh)
template<typename AlphaIter >
static void	clamp_solid_with_orig (uint8_t dst[], int dstRowBytes, AlphaIter src, int srcRowBytes, int sw, int sh)
template<typename AlphaIter >
static void	clamp_outer_with_orig (uint8_t dst[], int dstRowBytes, AlphaIter src, int srcRowBytes, int sw, int sh)
void	SkMask_FreeImage (uint8_t *image)
static float	gaussianIntegral (float x)

Variables
static const SkScalar	kBLUR_SIGMA_SCALE = 0.57735f

Function Documentation

clamp_outer_with_orig()

template<typename AlphaIter >

static void clamp_outer_with_orig ( uint8_t  dst[], int  dstRowBytes, AlphaIter  src, int  srcRowBytes, int  sw, int  sh  )

static

Definition at line 89 of file SkBlurMask.cpp.

                                                  {
    int x;
    while (--sh >= 0) {
        AlphaIter rowSrc(src);
        for (x = sw - 1; x >= 0; --x) {
            int srcValue = *rowSrc;
            if (srcValue) {
                *dst = SkToU8(SkAlphaMul(*dst, SkAlpha255To256(255 - srcValue)));
            }
            ++dst;
            ++rowSrc;
        }
        dst += dstRowBytes - sw;
        src >>= srcRowBytes;
    }
}

clamp_solid_with_orig()

template<typename AlphaIter >

static void clamp_solid_with_orig ( uint8_t  dst[], int  dstRowBytes, AlphaIter  src, int  srcRowBytes, int  sw, int  sh  )

static

Definition at line 70 of file SkBlurMask.cpp.

                                                  {
    int x;
    while (--sh >= 0) {
        AlphaIter rowSrc(src);
        for (x = sw - 1; x >= 0; --x) {
            int s = *rowSrc;
            int d = *dst;
            *dst = SkToU8(s + d - SkMulDiv255Round(s, d));
            ++dst;
            ++rowSrc;
        }
        dst += dstRowBytes - sw;
        src >>= srcRowBytes;
    }
}

gaussianIntegral()

static float gaussianIntegral ( float  x )

static

Definition at line 321 of file SkBlurMask.cpp.

                                       {
    if (x > 1.5f) {
        return 0.0f;
    }
    if (x < -1.5f) {
        return 1.0f;
    }
 
    float x2 = x*x;
    float x3 = x2*x;
 
    if ( x > 0.5f ) {
        return 0.5625f - (x3 / 6.0f - 3.0f * x2 * 0.25f + 1.125f * x);
    }
    if ( x > -0.5f ) {
        return 0.5f - (0.75f * x - x3 / 3.0f);
    }
    return 0.4375f + (-x3 / 6.0f - 3.0f * x2 * 0.25f - 1.125f * x);
}

merge_src_with_blur()

template<typename AlphaIter >

static void merge_src_with_blur ( uint8_t  dst[], int  dstRB, AlphaIter  src, int  srcRB, const uint8_t  blur[], int  blurRB, int  sw, int  sh  )

static

Definition at line 49 of file SkBlurMask.cpp.

                                                {
    dstRB -= sw;
    blurRB -= sw;
    while (--sh >= 0) {
        AlphaIter rowSrc(src);
        for (int x = sw - 1; x >= 0; --x) {
            *dst = SkToU8(SkAlphaMul(*blur, SkAlpha255To256(*rowSrc)));
            ++dst;
            ++rowSrc;
            ++blur;
        }
        dst += dstRB;
        src >>= srcRB;
        blur += blurRB;
    }
}

SkMask_FreeImage()

void SkMask_FreeImage

(

uint8_t *

image

)

Definition at line 112 of file SkBlurMask.cpp.

                                      {
    SkMaskBuilder::FreeImage(image);
}

Variable Documentation

kBLUR_SIGMA_SCALE

const SkScalar kBLUR_SIGMA_SCALE = 0.57735f

static

Definition at line 37 of file SkBlurMask.cpp.