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SkXfermode.cpp
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SkXfermode.cpp
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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.
*/
#include "SkXfermode.h"
#include "SkColorPriv.h"
#define SkAlphaMulAlpha(a, b) SkMulDiv255Round(a, b)
#if 0
// idea for higher precision blends in xfer procs (and slightly faster)
// see DstATop as a probable caller
static U8CPU mulmuldiv255round(U8CPU a, U8CPU b, U8CPU c, U8CPU d) {
SkASSERT(a <= 255);
SkASSERT(b <= 255);
SkASSERT(c <= 255);
SkASSERT(d <= 255);
unsigned prod = SkMulS16(a, b) + SkMulS16(c, d) + 128;
unsigned result = (prod + (prod >> 8)) >> 8;
SkASSERT(result <= 255);
return result;
}
#endif
static inline unsigned saturated_add(unsigned a, unsigned b) {
SkASSERT(a <= 255);
SkASSERT(b <= 255);
unsigned sum = a + b;
if (sum > 255) {
sum = 255;
}
return sum;
}
static inline int clamp_signed_byte(int n) {
if (n < 0) {
n = 0;
} else if (n > 255) {
n = 255;
}
return n;
}
static inline int clamp_div255round(int prod) {
if (prod <= 0) {
return 0;
} else if (prod >= 255*255) {
return 255;
} else {
return SkDiv255Round(prod);
}
}
static inline int clamp_max(int value, int max) {
if (value > max) {
value = max;
}
return value;
}
///////////////////////////////////////////////////////////////////////////////
// kClear_Mode, //!< [0, 0]
static SkPMColor clear_modeproc(SkPMColor src, SkPMColor dst) {
return 0;
}
// kSrc_Mode, //!< [Sa, Sc]
static SkPMColor src_modeproc(SkPMColor src, SkPMColor dst) {
return src;
}
// kDst_Mode, //!< [Da, Dc]
static SkPMColor dst_modeproc(SkPMColor src, SkPMColor dst) {
return dst;
}
// kSrcOver_Mode, //!< [Sa + Da - Sa*Da, Sc + (1 - Sa)*Dc]
static SkPMColor srcover_modeproc(SkPMColor src, SkPMColor dst) {
#if 0
// this is the old, more-correct way, but it doesn't guarantee that dst==255
// will always stay opaque
return src + SkAlphaMulQ(dst, SkAlpha255To256(255 - SkGetPackedA32(src)));
#else
// this is slightly faster, but more importantly guarantees that dst==255
// will always stay opaque
return src + SkAlphaMulQ(dst, 256 - SkGetPackedA32(src));
#endif
}
// kDstOver_Mode, //!< [Sa + Da - Sa*Da, Dc + (1 - Da)*Sc]
static SkPMColor dstover_modeproc(SkPMColor src, SkPMColor dst) {
// this is the reverse of srcover, just flipping src and dst
// see srcover's comment about the 256 for opaqueness guarantees
return dst + SkAlphaMulQ(src, 256 - SkGetPackedA32(dst));
}
// kSrcIn_Mode, //!< [Sa * Da, Sc * Da]
static SkPMColor srcin_modeproc(SkPMColor src, SkPMColor dst) {
return SkAlphaMulQ(src, SkAlpha255To256(SkGetPackedA32(dst)));
}
// kDstIn_Mode, //!< [Sa * Da, Sa * Dc]
static SkPMColor dstin_modeproc(SkPMColor src, SkPMColor dst) {
return SkAlphaMulQ(dst, SkAlpha255To256(SkGetPackedA32(src)));
}
// kSrcOut_Mode, //!< [Sa * (1 - Da), Sc * (1 - Da)]
static SkPMColor srcout_modeproc(SkPMColor src, SkPMColor dst) {
return SkAlphaMulQ(src, SkAlpha255To256(255 - SkGetPackedA32(dst)));
}
// kDstOut_Mode, //!< [Da * (1 - Sa), Dc * (1 - Sa)]
static SkPMColor dstout_modeproc(SkPMColor src, SkPMColor dst) {
return SkAlphaMulQ(dst, SkAlpha255To256(255 - SkGetPackedA32(src)));
}
// kSrcATop_Mode, //!< [Da, Sc * Da + (1 - Sa) * Dc]
static SkPMColor srcatop_modeproc(SkPMColor src, SkPMColor dst) {
unsigned sa = SkGetPackedA32(src);
unsigned da = SkGetPackedA32(dst);
unsigned isa = 255 - sa;
return SkPackARGB32(da,
SkAlphaMulAlpha(da, SkGetPackedR32(src)) +
SkAlphaMulAlpha(isa, SkGetPackedR32(dst)),
SkAlphaMulAlpha(da, SkGetPackedG32(src)) +
SkAlphaMulAlpha(isa, SkGetPackedG32(dst)),
SkAlphaMulAlpha(da, SkGetPackedB32(src)) +
SkAlphaMulAlpha(isa, SkGetPackedB32(dst)));
}
// kDstATop_Mode, //!< [Sa, Sa * Dc + Sc * (1 - Da)]
static SkPMColor dstatop_modeproc(SkPMColor src, SkPMColor dst) {
unsigned sa = SkGetPackedA32(src);
unsigned da = SkGetPackedA32(dst);
unsigned ida = 255 - da;
return SkPackARGB32(sa,
SkAlphaMulAlpha(ida, SkGetPackedR32(src)) +
SkAlphaMulAlpha(sa, SkGetPackedR32(dst)),
SkAlphaMulAlpha(ida, SkGetPackedG32(src)) +
SkAlphaMulAlpha(sa, SkGetPackedG32(dst)),
SkAlphaMulAlpha(ida, SkGetPackedB32(src)) +
SkAlphaMulAlpha(sa, SkGetPackedB32(dst)));
}
// kXor_Mode [Sa + Da - 2 * Sa * Da, Sc * (1 - Da) + (1 - Sa) * Dc]
static SkPMColor xor_modeproc(SkPMColor src, SkPMColor dst) {
unsigned sa = SkGetPackedA32(src);
unsigned da = SkGetPackedA32(dst);
unsigned isa = 255 - sa;
unsigned ida = 255 - da;
return SkPackARGB32(sa + da - (SkAlphaMulAlpha(sa, da) << 1),
SkAlphaMulAlpha(ida, SkGetPackedR32(src)) +
SkAlphaMulAlpha(isa, SkGetPackedR32(dst)),
SkAlphaMulAlpha(ida, SkGetPackedG32(src)) +
SkAlphaMulAlpha(isa, SkGetPackedG32(dst)),
SkAlphaMulAlpha(ida, SkGetPackedB32(src)) +
SkAlphaMulAlpha(isa, SkGetPackedB32(dst)));
}
///////////////////////////////////////////////////////////////////////////////
// kPlus_Mode
static SkPMColor plus_modeproc(SkPMColor src, SkPMColor dst) {
unsigned b = saturated_add(SkGetPackedB32(src), SkGetPackedB32(dst));
unsigned g = saturated_add(SkGetPackedG32(src), SkGetPackedG32(dst));
unsigned r = saturated_add(SkGetPackedR32(src), SkGetPackedR32(dst));
unsigned a = saturated_add(SkGetPackedA32(src), SkGetPackedA32(dst));
return SkPackARGB32(a, r, g, b);
}
// kMultiply_Mode
static SkPMColor multiply_modeproc(SkPMColor src, SkPMColor dst) {
int a = SkAlphaMulAlpha(SkGetPackedA32(src), SkGetPackedA32(dst));
int r = SkAlphaMulAlpha(SkGetPackedR32(src), SkGetPackedR32(dst));
int g = SkAlphaMulAlpha(SkGetPackedG32(src), SkGetPackedG32(dst));
int b = SkAlphaMulAlpha(SkGetPackedB32(src), SkGetPackedB32(dst));
return SkPackARGB32(a, r, g, b);
}
// kScreen_Mode
static inline int srcover_byte(int a, int b) {
return a + b - SkAlphaMulAlpha(a, b);
}
static SkPMColor screen_modeproc(SkPMColor src, SkPMColor dst) {
int a = srcover_byte(SkGetPackedA32(src), SkGetPackedA32(dst));
int r = srcover_byte(SkGetPackedR32(src), SkGetPackedR32(dst));
int g = srcover_byte(SkGetPackedG32(src), SkGetPackedG32(dst));
int b = srcover_byte(SkGetPackedB32(src), SkGetPackedB32(dst));
return SkPackARGB32(a, r, g, b);
}
// kOverlay_Mode
static inline int overlay_byte(int sc, int dc, int sa, int da) {
int tmp = sc * (255 - da) + dc * (255 - sa);
int rc;
if (2 * dc <= da) {
rc = 2 * sc * dc;
} else {
rc = sa * da - 2 * (da - dc) * (sa - sc);
}
return clamp_div255round(rc + tmp);
}
static SkPMColor overlay_modeproc(SkPMColor src, SkPMColor dst) {
int sa = SkGetPackedA32(src);
int da = SkGetPackedA32(dst);
int a = srcover_byte(sa, da);
int r = overlay_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da);
int g = overlay_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da);
int b = overlay_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da);
return SkPackARGB32(a, r, g, b);
}
// kDarken_Mode
static inline int darken_byte(int sc, int dc, int sa, int da) {
int sd = sc * da;
int ds = dc * sa;
if (sd < ds) {
// srcover
return sc + dc - SkDiv255Round(ds);
} else {
// dstover
return dc + sc - SkDiv255Round(sd);
}
}
static SkPMColor darken_modeproc(SkPMColor src, SkPMColor dst) {
int sa = SkGetPackedA32(src);
int da = SkGetPackedA32(dst);
int a = srcover_byte(sa, da);
int r = darken_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da);
int g = darken_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da);
int b = darken_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da);
return SkPackARGB32(a, r, g, b);
}
// kLighten_Mode
static inline int lighten_byte(int sc, int dc, int sa, int da) {
int sd = sc * da;
int ds = dc * sa;
if (sd > ds) {
// srcover
return sc + dc - SkDiv255Round(ds);
} else {
// dstover
return dc + sc - SkDiv255Round(sd);
}
}
static SkPMColor lighten_modeproc(SkPMColor src, SkPMColor dst) {
int sa = SkGetPackedA32(src);
int da = SkGetPackedA32(dst);
int a = srcover_byte(sa, da);
int r = lighten_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da);
int g = lighten_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da);
int b = lighten_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da);
return SkPackARGB32(a, r, g, b);
}
// kColorDodge_Mode
static inline int colordodge_byte(int sc, int dc, int sa, int da) {
int diff = sa - sc;
int rc;
if (0 == diff) {
rc = sa * da + sc * (255 - da) + dc * (255 - sa);
rc = SkDiv255Round(rc);
} else {
int tmp = (dc * sa << 15) / (da * diff);
rc = SkDiv255Round(sa * da) * tmp >> 15;
// don't clamp here, since we'll do it in our modeproc
}
return rc;
}
static SkPMColor colordodge_modeproc(SkPMColor src, SkPMColor dst) {
// added to avoid div-by-zero in colordodge_byte
if (0 == dst) {
return src;
}
int sa = SkGetPackedA32(src);
int da = SkGetPackedA32(dst);
int a = srcover_byte(sa, da);
int r = colordodge_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da);
int g = colordodge_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da);
int b = colordodge_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da);
r = clamp_max(r, a);
g = clamp_max(g, a);
b = clamp_max(b, a);
return SkPackARGB32(a, r, g, b);
}
// kColorBurn_Mode
static inline int colorburn_byte(int sc, int dc, int sa, int da) {
int rc;
if (dc == da && 0 == sc) {
rc = sa * da + dc * (255 - sa);
} else if (0 == sc) {
return SkAlphaMulAlpha(dc, 255 - sa);
} else {
int tmp = (sa * (da - dc) * 256) / (sc * da);
if (tmp > 256) {
tmp = 256;
}
int tmp2 = sa * da;
rc = tmp2 - (tmp2 * tmp >> 8) + sc * (255 - da) + dc * (255 - sa);
}
return SkDiv255Round(rc);
}
static SkPMColor colorburn_modeproc(SkPMColor src, SkPMColor dst) {
// added to avoid div-by-zero in colorburn_byte
if (0 == dst) {
return src;
}
int sa = SkGetPackedA32(src);
int da = SkGetPackedA32(dst);
int a = srcover_byte(sa, da);
int r = colorburn_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da);
int g = colorburn_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da);
int b = colorburn_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da);
return SkPackARGB32(a, r, g, b);
}
// kHardLight_Mode
static inline int hardlight_byte(int sc, int dc, int sa, int da) {
int rc;
if (2 * sc <= sa) {
rc = 2 * sc * dc;
} else {
rc = sa * da - 2 * (da - dc) * (sa - sc);
}
return clamp_div255round(rc + sc * (255 - da) + dc * (255 - sa));
}
static SkPMColor hardlight_modeproc(SkPMColor src, SkPMColor dst) {
int sa = SkGetPackedA32(src);
int da = SkGetPackedA32(dst);
int a = srcover_byte(sa, da);
int r = hardlight_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da);
int g = hardlight_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da);
int b = hardlight_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da);
return SkPackARGB32(a, r, g, b);
}
// returns 255 * sqrt(n/255)
static U8CPU sqrt_unit_byte(U8CPU n) {
return SkSqrtBits(n, 15+4);
}
// kSoftLight_Mode
static inline int softlight_byte(int sc, int dc, int sa, int da) {
int m = da ? dc * 256 / da : 0;
int rc;
if (2 * sc <= sa) {
rc = dc * (sa + ((2 * sc - sa) * (256 - m) >> 8));
} else if (4 * dc <= da) {
int tmp = (4 * m * (4 * m + 256) * (m - 256) >> 16) + 7 * m;
rc = dc * sa + (da * (2 * sc - sa) * tmp >> 8);
} else {
int tmp = sqrt_unit_byte(m) - m;
rc = dc * sa + (da * (2 * sc - sa) * tmp >> 8);
}
return clamp_div255round(rc + sc * (255 - da) + dc * (255 - sa));
}
static SkPMColor softlight_modeproc(SkPMColor src, SkPMColor dst) {
int sa = SkGetPackedA32(src);
int da = SkGetPackedA32(dst);
int a = srcover_byte(sa, da);
int r = softlight_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da);
int g = softlight_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da);
int b = softlight_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da);
return SkPackARGB32(a, r, g, b);
}
// kDifference_Mode
static inline int difference_byte(int sc, int dc, int sa, int da) {
int tmp = SkMin32(sc * da, dc * sa);
return clamp_signed_byte(sc + dc - 2 * SkDiv255Round(tmp));
}
static SkPMColor difference_modeproc(SkPMColor src, SkPMColor dst) {
int sa = SkGetPackedA32(src);
int da = SkGetPackedA32(dst);
int a = srcover_byte(sa, da);
int r = difference_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da);
int g = difference_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da);
int b = difference_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da);
return SkPackARGB32(a, r, g, b);
}
// kExclusion_Mode
static inline int exclusion_byte(int sc, int dc, int sa, int da) {
// this equations is wacky, wait for SVG to confirm it
int r = sc * da + dc * sa - 2 * sc * dc + sc * (255 - da) + dc * (255 - sa);
return clamp_div255round(r);
}
static SkPMColor exclusion_modeproc(SkPMColor src, SkPMColor dst) {
int sa = SkGetPackedA32(src);
int da = SkGetPackedA32(dst);
int a = srcover_byte(sa, da);
int r = exclusion_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da);
int g = exclusion_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da);
int b = exclusion_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da);
return SkPackARGB32(a, r, g, b);
}
struct ProcCoeff {
SkXfermodeProc fProc;
SkXfermode::Coeff fSC;
SkXfermode::Coeff fDC;
};
#define CANNOT_USE_COEFF SkXfermode::Coeff(-1)
static const ProcCoeff gProcCoeffs[] = {
{ clear_modeproc, SkXfermode::kZero_Coeff, SkXfermode::kZero_Coeff },
{ src_modeproc, SkXfermode::kOne_Coeff, SkXfermode::kZero_Coeff },
{ dst_modeproc, SkXfermode::kZero_Coeff, SkXfermode::kOne_Coeff },
{ srcover_modeproc, SkXfermode::kOne_Coeff, SkXfermode::kISA_Coeff },
{ dstover_modeproc, SkXfermode::kIDA_Coeff, SkXfermode::kOne_Coeff },
{ srcin_modeproc, SkXfermode::kDA_Coeff, SkXfermode::kZero_Coeff },
{ dstin_modeproc, SkXfermode::kZero_Coeff, SkXfermode::kSA_Coeff },
{ srcout_modeproc, SkXfermode::kIDA_Coeff, SkXfermode::kZero_Coeff },
{ dstout_modeproc, SkXfermode::kZero_Coeff, SkXfermode::kISA_Coeff },
{ srcatop_modeproc, SkXfermode::kDA_Coeff, SkXfermode::kISA_Coeff },
{ dstatop_modeproc, SkXfermode::kIDA_Coeff, SkXfermode::kSA_Coeff },
{ xor_modeproc, SkXfermode::kIDA_Coeff, SkXfermode::kISA_Coeff },
{ plus_modeproc, SkXfermode::kOne_Coeff, SkXfermode::kOne_Coeff },
{ multiply_modeproc,SkXfermode::kZero_Coeff, SkXfermode::kSC_Coeff },
{ screen_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF },
{ overlay_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF },
{ darken_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF },
{ lighten_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF },
{ colordodge_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF },
{ colorburn_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF },
{ hardlight_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF },
{ softlight_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF },
{ difference_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF },
{ exclusion_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF },
};
///////////////////////////////////////////////////////////////////////////////
bool SkXfermode::asCoeff(Coeff* src, Coeff* dst) {
return false;
}
bool SkXfermode::asMode(Mode* mode) {
return false;
}
SkPMColor SkXfermode::xferColor(SkPMColor src, SkPMColor dst) {
// no-op. subclasses should override this
return dst;
}
void SkXfermode::xfer32(SkPMColor* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src, int count,
const SkAlpha* SK_RESTRICT aa) {
SkASSERT(dst && src && count >= 0);
if (NULL == aa) {
for (int i = count - 1; i >= 0; --i) {
dst[i] = this->xferColor(src[i], dst[i]);
}
} else {
for (int i = count - 1; i >= 0; --i) {
unsigned a = aa[i];
if (0 != a) {
SkPMColor dstC = dst[i];
SkPMColor C = this->xferColor(src[i], dstC);
if (0xFF != a) {
C = SkFourByteInterp(C, dstC, a);
}
dst[i] = C;
}
}
}
}
void SkXfermode::xfer16(uint16_t* dst,
const SkPMColor* SK_RESTRICT src, int count,
const SkAlpha* SK_RESTRICT aa) {
SkASSERT(dst && src && count >= 0);
if (NULL == aa) {
for (int i = count - 1; i >= 0; --i) {
SkPMColor dstC = SkPixel16ToPixel32(dst[i]);
dst[i] = SkPixel32ToPixel16_ToU16(this->xferColor(src[i], dstC));
}
} else {
for (int i = count - 1; i >= 0; --i) {
unsigned a = aa[i];
if (0 != a) {
SkPMColor dstC = SkPixel16ToPixel32(dst[i]);
SkPMColor C = this->xferColor(src[i], dstC);
if (0xFF != a) {
C = SkFourByteInterp(C, dstC, a);
}
dst[i] = SkPixel32ToPixel16_ToU16(C);
}
}
}
}
void SkXfermode::xfer4444(SkPMColor16* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src, int count,
const SkAlpha* SK_RESTRICT aa)
{
SkASSERT(dst && src && count >= 0);
if (NULL == aa) {
for (int i = count - 1; i >= 0; --i) {
SkPMColor dstC = SkPixel4444ToPixel32(dst[i]);
dst[i] = SkPixel32ToPixel4444(this->xferColor(src[i], dstC));
}
} else {
for (int i = count - 1; i >= 0; --i) {
unsigned a = aa[i];
if (0 != a) {
SkPMColor dstC = SkPixel4444ToPixel32(dst[i]);
SkPMColor C = this->xferColor(src[i], dstC);
if (0xFF != a) {
C = SkFourByteInterp(C, dstC, a);
}
dst[i] = SkPixel32ToPixel4444(C);
}
}
}
}
void SkXfermode::xferA8(SkAlpha* SK_RESTRICT dst,
const SkPMColor src[], int count,
const SkAlpha* SK_RESTRICT aa)
{
SkASSERT(dst && src && count >= 0);
if (NULL == aa) {
for (int i = count - 1; i >= 0; --i) {
SkPMColor res = this->xferColor(src[i], (dst[i] << SK_A32_SHIFT));
dst[i] = SkToU8(SkGetPackedA32(res));
}
} else {
for (int i = count - 1; i >= 0; --i) {
unsigned a = aa[i];
if (0 != a) {
SkAlpha dstA = dst[i];
unsigned A = SkGetPackedA32(this->xferColor(src[i],
(SkPMColor)(dstA << SK_A32_SHIFT)));
if (0xFF != a) {
A = SkAlphaBlend(A, dstA, SkAlpha255To256(a));
}
dst[i] = SkToU8(A);
}
}
}
}
///////////////////////////////////////////////////////////////////////////////
void SkProcXfermode::xfer32(SkPMColor* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src, int count,
const SkAlpha* SK_RESTRICT aa) {
SkASSERT(dst && src && count >= 0);
SkXfermodeProc proc = fProc;
if (NULL != proc) {
if (NULL == aa) {
for (int i = count - 1; i >= 0; --i) {
dst[i] = proc(src[i], dst[i]);
}
} else {
for (int i = count - 1; i >= 0; --i) {
unsigned a = aa[i];
if (0 != a) {
SkPMColor dstC = dst[i];
SkPMColor C = proc(src[i], dstC);
if (a != 0xFF) {
C = SkFourByteInterp(C, dstC, a);
}
dst[i] = C;
}
}
}
}
}
void SkProcXfermode::xfer16(uint16_t* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src, int count,
const SkAlpha* SK_RESTRICT aa) {
SkASSERT(dst && src && count >= 0);
SkXfermodeProc proc = fProc;
if (NULL != proc) {
if (NULL == aa) {
for (int i = count - 1; i >= 0; --i) {
SkPMColor dstC = SkPixel16ToPixel32(dst[i]);
dst[i] = SkPixel32ToPixel16_ToU16(proc(src[i], dstC));
}
} else {
for (int i = count - 1; i >= 0; --i) {
unsigned a = aa[i];
if (0 != a) {
SkPMColor dstC = SkPixel16ToPixel32(dst[i]);
SkPMColor C = proc(src[i], dstC);
if (0xFF != a) {
C = SkFourByteInterp(C, dstC, a);
}
dst[i] = SkPixel32ToPixel16_ToU16(C);
}
}
}
}
}
void SkProcXfermode::xfer4444(SkPMColor16* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src, int count,
const SkAlpha* SK_RESTRICT aa) {
SkASSERT(dst && src && count >= 0);
SkXfermodeProc proc = fProc;
if (NULL != proc) {
if (NULL == aa) {
for (int i = count - 1; i >= 0; --i) {
SkPMColor dstC = SkPixel4444ToPixel32(dst[i]);
dst[i] = SkPixel32ToPixel4444(proc(src[i], dstC));
}
} else {
for (int i = count - 1; i >= 0; --i) {
unsigned a = aa[i];
if (0 != a) {
SkPMColor dstC = SkPixel4444ToPixel32(dst[i]);
SkPMColor C = proc(src[i], dstC);
if (0xFF != a) {
C = SkFourByteInterp(C, dstC, a);
}
dst[i] = SkPixel32ToPixel4444(C);
}
}
}
}
}
void SkProcXfermode::xferA8(SkAlpha* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src, int count,
const SkAlpha* SK_RESTRICT aa) {
SkASSERT(dst && src && count >= 0);
SkXfermodeProc proc = fProc;
if (NULL != proc) {
if (NULL == aa) {
for (int i = count - 1; i >= 0; --i) {
SkPMColor res = proc(src[i], dst[i] << SK_A32_SHIFT);
dst[i] = SkToU8(SkGetPackedA32(res));
}
} else {
for (int i = count - 1; i >= 0; --i) {
unsigned a = aa[i];
if (0 != a) {
SkAlpha dstA = dst[i];
SkPMColor res = proc(src[i], dstA << SK_A32_SHIFT);
unsigned A = SkGetPackedA32(res);
if (0xFF != a) {
A = SkAlphaBlend(A, dstA, SkAlpha255To256(a));
}
dst[i] = SkToU8(A);
}
}
}
}
}
SkProcXfermode::SkProcXfermode(SkFlattenableReadBuffer& buffer)
: SkXfermode(buffer) {
// Might be a NULL if the Xfermode is recorded using the CrossProcess flag
fProc = (SkXfermodeProc)buffer.readFunctionPtr();
}
void SkProcXfermode::flatten(SkFlattenableWriteBuffer& buffer) {
if (buffer.isCrossProcess()) {
// function pointer is only valid in the current process. Write a NULL
// so it can't be accidentally used
buffer.writeFunctionPtr(NULL);
} else {
buffer.writeFunctionPtr((void*)fProc);
}
}
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
class SkProcCoeffXfermode : public SkProcXfermode {
public:
SkProcCoeffXfermode(const ProcCoeff& rec, Mode mode)
: INHERITED(rec.fProc) {
fMode = mode;
// these may be valid, or may be CANNOT_USE_COEFF
fSrcCoeff = rec.fSC;
fDstCoeff = rec.fDC;
}
virtual bool asMode(Mode* mode) {
if (mode) {
*mode = fMode;
}
return true;
}
virtual bool asCoeff(Coeff* sc, Coeff* dc) {
if (CANNOT_USE_COEFF == fSrcCoeff) {
return false;
}
if (sc) {
*sc = fSrcCoeff;
}
if (dc) {
*dc = fDstCoeff;
}
return true;
}
virtual Factory getFactory() { return CreateProc; }
virtual void flatten(SkFlattenableWriteBuffer& buffer) {
this->INHERITED::flatten(buffer);
buffer.write32(fMode);
}
static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) {
return SkNEW_ARGS(SkProcCoeffXfermode, (buffer));
}
protected:
SkProcCoeffXfermode(SkFlattenableReadBuffer& buffer)
: INHERITED(buffer) {
fMode = (SkXfermode::Mode)buffer.readU32();
if (buffer.getPictureVersion() == PICTURE_VERSION_ICS) {
fSrcCoeff = (Coeff)buffer.readU32();
fDstCoeff = (Coeff)buffer.readU32();
return;
}
const ProcCoeff& rec = gProcCoeffs[fMode];
// these may be valid, or may be CANNOT_USE_COEFF
fSrcCoeff = rec.fSC;
fDstCoeff = rec.fDC;
// now update our function-ptr in the super class
this->INHERITED::setProc(rec.fProc);
}
private:
Mode fMode;
Coeff fSrcCoeff, fDstCoeff;
typedef SkProcXfermode INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
class SkClearXfermode : public SkProcCoeffXfermode {
public:
SkClearXfermode(const ProcCoeff& rec) : SkProcCoeffXfermode(rec, kClear_Mode) {}
virtual void xfer32(SkPMColor*, const SkPMColor*, int, const SkAlpha*) SK_OVERRIDE;
virtual void xferA8(SkAlpha*, const SkPMColor*, int, const SkAlpha*) SK_OVERRIDE;
virtual Factory getFactory() SK_OVERRIDE { return CreateProc; }
static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) {
return SkNEW_ARGS(SkClearXfermode, (buffer));
}
private:
SkClearXfermode(SkFlattenableReadBuffer& buffer)
: SkProcCoeffXfermode(buffer) {}
};
void SkClearXfermode::xfer32(SkPMColor* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT, int count,
const SkAlpha* SK_RESTRICT aa) {
SkASSERT(dst && count >= 0);
if (NULL == aa) {
memset(dst, 0, count << 2);
} else {
for (int i = count - 1; i >= 0; --i) {
unsigned a = aa[i];
if (0xFF == a) {
dst[i] = 0;
} else if (a != 0) {
dst[i] = SkAlphaMulQ(dst[i], SkAlpha255To256(255 - a));
}
}
}
}
void SkClearXfermode::xferA8(SkAlpha* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT, int count,
const SkAlpha* SK_RESTRICT aa) {
SkASSERT(dst && count >= 0);
if (NULL == aa) {
memset(dst, 0, count);
} else {
for (int i = count - 1; i >= 0; --i) {
unsigned a = aa[i];
if (0xFF == a) {
dst[i] = 0;
} else if (0 != a) {
dst[i] = SkAlphaMulAlpha(dst[i], 255 - a);
}
}
}
}
///////////////////////////////////////////////////////////////////////////////
class SkSrcXfermode : public SkProcCoeffXfermode {
public:
SkSrcXfermode(const ProcCoeff& rec) : SkProcCoeffXfermode(rec, kSrc_Mode) {}
virtual void xfer32(SkPMColor*, const SkPMColor*, int, const SkAlpha*) SK_OVERRIDE;
virtual void xferA8(SkAlpha*, const SkPMColor*, int, const SkAlpha*) SK_OVERRIDE;
virtual Factory getFactory() SK_OVERRIDE { return CreateProc; }
static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) {
return SkNEW_ARGS(SkSrcXfermode, (buffer));
}
private:
SkSrcXfermode(SkFlattenableReadBuffer& buffer)
: SkProcCoeffXfermode(buffer) {}
};
void SkSrcXfermode::xfer32(SkPMColor* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src, int count,
const SkAlpha* SK_RESTRICT aa) {
SkASSERT(dst && src && count >= 0);
if (NULL == aa) {
memcpy(dst, src, count << 2);
} else {
for (int i = count - 1; i >= 0; --i) {
unsigned a = aa[i];
if (a == 0xFF) {
dst[i] = src[i];
} else if (a != 0) {
dst[i] = SkFourByteInterp(src[i], dst[i], a);
}
}
}
}
void SkSrcXfermode::xferA8(SkAlpha* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src, int count,
const SkAlpha* SK_RESTRICT aa) {
SkASSERT(dst && src && count >= 0);
if (NULL == aa) {
for (int i = count - 1; i >= 0; --i) {
dst[i] = SkToU8(SkGetPackedA32(src[i]));
}
} else {
for (int i = count - 1; i >= 0; --i) {
unsigned a = aa[i];
if (0 != a) {
unsigned srcA = SkGetPackedA32(src[i]);
if (a == 0xFF) {
dst[i] = SkToU8(srcA);
} else {
dst[i] = SkToU8(SkAlphaBlend(srcA, dst[i], a));
}
}
}
}
}
////////////////////////////////////////////////////////////////////////////////////
class SkDstInXfermode : public SkProcCoeffXfermode {
public:
SkDstInXfermode(const ProcCoeff& rec) : SkProcCoeffXfermode(rec, kDstIn_Mode) {}
virtual void xfer32(SkPMColor*, const SkPMColor*, int, const SkAlpha*) SK_OVERRIDE;
virtual Factory getFactory() SK_OVERRIDE { return CreateProc; }
static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) {
return SkNEW_ARGS(SkDstInXfermode, (buffer));
}
private:
SkDstInXfermode(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {}
typedef SkProcCoeffXfermode INHERITED;
};
void SkDstInXfermode::xfer32(SkPMColor* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src, int count,
const SkAlpha* SK_RESTRICT aa) {
SkASSERT(dst && src);
if (count <= 0) {
return;
}
if (NULL != aa) {
return this->INHERITED::xfer32(dst, src, count, aa);
}
do {
unsigned a = SkGetPackedA32(*src);
*dst = SkAlphaMulQ(*dst, SkAlpha255To256(a));
dst++;
src++;
} while (--count != 0);
}
/////////////////////////////////////////////////////////////////////////////////////////
class SkDstOutXfermode : public SkProcCoeffXfermode {
public:
SkDstOutXfermode(const ProcCoeff& rec) : SkProcCoeffXfermode(rec, kDstOut_Mode) {}
virtual void xfer32(SkPMColor*, const SkPMColor*, int, const SkAlpha*) SK_OVERRIDE;
virtual Factory getFactory() SK_OVERRIDE { return CreateProc; }
static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) {
return SkNEW_ARGS(SkDstOutXfermode, (buffer));
}
private:
SkDstOutXfermode(SkFlattenableReadBuffer& buffer)
: INHERITED(buffer) {}
typedef SkProcCoeffXfermode INHERITED;
};
void SkDstOutXfermode::xfer32(SkPMColor* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src, int count,
const SkAlpha* SK_RESTRICT aa) {
SkASSERT(dst && src);
if (count <= 0) {
return;
}
if (NULL != aa) {
return this->INHERITED::xfer32(dst, src, count, aa);
}
do {
unsigned a = SkGetPackedA32(*src);
*dst = SkAlphaMulQ(*dst, SkAlpha255To256(255 - a));
dst++;
src++;
} while (--count != 0);
}
///////////////////////////////////////////////////////////////////////////////
SkXfermode* SkXfermode::Create(Mode mode) {
SkASSERT(SK_ARRAY_COUNT(gProcCoeffs) == kModeCount);
SkASSERT((unsigned)mode < kModeCount);
const ProcCoeff& rec = gProcCoeffs[mode];
switch (mode) {
case kClear_Mode:
return SkNEW_ARGS(SkClearXfermode, (rec));
case kSrc_Mode:
return SkNEW_ARGS(SkSrcXfermode, (rec));
case kSrcOver_Mode:
return NULL;
case kDstIn_Mode:
return SkNEW_ARGS(SkDstInXfermode, (rec));
case kDstOut_Mode:
return SkNEW_ARGS(SkDstOutXfermode, (rec));
default:
return SkNEW_ARGS(SkProcCoeffXfermode, (rec, mode));
}
}
SkXfermodeProc SkXfermode::GetProc(Mode mode) {
SkXfermodeProc proc = NULL;
if ((unsigned)mode < kModeCount) {
proc = gProcCoeffs[mode].fProc;
}
return proc;
}
bool SkXfermode::ModeAsCoeff(Mode mode, Coeff* src, Coeff* dst) {