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/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "SkXfermode.h"
#include "SkColorPriv.h"
#define SkAlphaMulAlpha(a, b) SkMulDiv255Round(a, b)
static SkPMColor SkFourByteInterp(SkPMColor src, SkPMColor dst, U8CPU alpha) {
unsigned scale = SkAlpha255To256(alpha);
unsigned a = SkAlphaBlend(SkGetPackedA32(src), SkGetPackedA32(dst), scale);
unsigned r = SkAlphaBlend(SkGetPackedR32(src), SkGetPackedR32(dst), scale);
unsigned g = SkAlphaBlend(SkGetPackedG32(src), SkGetPackedG32(dst), scale);
unsigned b = SkAlphaBlend(SkGetPackedB32(src), SkGetPackedB32(dst), scale);
return SkPackARGB32(a, r, g, 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
///////////////////////////////////////////////////////////////////////////////
bool SkXfermode::asCoeff(Coeff* src, Coeff* dst) {
return false;
}
SkPMColor SkXfermode::xferColor(SkPMColor src, SkPMColor dst) {
// no-op. subclasses should override this
return dst;
}
void SkXfermode::xfer32(SK_RESTRICT SkPMColor dst[],
const SK_RESTRICT SkPMColor src[], int count,
const SK_RESTRICT SkAlpha 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(SK_RESTRICT uint16_t dst[],
const SK_RESTRICT SkPMColor src[], int count,
const SK_RESTRICT SkAlpha 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(SK_RESTRICT SkPMColor16 dst[],
const SK_RESTRICT SkPMColor src[], int count,
const SK_RESTRICT SkAlpha 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(SK_RESTRICT SkAlpha dst[],
const SkPMColor src[], int count,
const SK_RESTRICT SkAlpha 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(SK_RESTRICT SkPMColor dst[],
const SK_RESTRICT SkPMColor src[], int count,
const SK_RESTRICT SkAlpha 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(SK_RESTRICT uint16_t dst[],
const SK_RESTRICT SkPMColor src[], int count,
const SK_RESTRICT SkAlpha 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(SK_RESTRICT SkPMColor16 dst[],
const SK_RESTRICT SkPMColor src[], int count,
const SK_RESTRICT SkAlpha 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(SK_RESTRICT SkAlpha dst[],
const SK_RESTRICT SkPMColor src[], int count,
const SK_RESTRICT SkAlpha 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) {
fProc = (SkXfermodeProc)buffer.readFunctionPtr();
}
void SkProcXfermode::flatten(SkFlattenableWriteBuffer& buffer) {
buffer.writeFunctionPtr((void*)fProc);
}
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
class SkProcCoeffXfermode : public SkProcXfermode {
public:
SkProcCoeffXfermode(SkXfermodeProc proc, Coeff sc, Coeff dc)
: INHERITED(proc), fSrcCoeff(sc), fDstCoeff(dc) {
}
virtual bool asCoeff(Coeff* sc, Coeff* dc) {
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(fSrcCoeff);
buffer.write32(fDstCoeff);
}
protected:
SkProcCoeffXfermode(SkFlattenableReadBuffer& buffer)
: INHERITED(buffer) {
fSrcCoeff = (Coeff)buffer.readU32();
fDstCoeff = (Coeff)buffer.readU32();
}
private:
Coeff fSrcCoeff, fDstCoeff;
static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) {
return SkNEW_ARGS(SkProcCoeffXfermode, (buffer)); }
typedef SkProcXfermode INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
// 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 + (1 - Sa)*Da, Sc + (1 - Sa)*Dc]
static SkPMColor srcover_modeproc(SkPMColor src, SkPMColor dst) {
return src + SkAlphaMulQ(dst, SkAlpha255To256(255 - SkGetPackedA32(src)));
}
// kDstOver_Mode, //!< [Sa + (1 - Sa)*Da, Dc + (1 - Da)*Sc]
static SkPMColor dstover_modeproc(SkPMColor src, SkPMColor dst) {
unsigned sa = SkGetPackedA32(src);
unsigned da = SkGetPackedA32(dst);
unsigned ida = 255 - da;
return SkPackARGB32(sa + da - SkAlphaMulAlpha(sa, da),
SkGetPackedR32(dst) + SkAlphaMulAlpha(ida, SkGetPackedR32(src)),
SkGetPackedG32(dst) + SkAlphaMulAlpha(ida, SkGetPackedG32(src)),
SkGetPackedB32(dst) + SkAlphaMulAlpha(ida, SkGetPackedB32(src)));
}
// 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)));
}
// kDarken_Mode, [Sa + Da - Sa·Da, Sc·(1 - Da) + Dc·(1 - Sa) + min(Sc, Dc)]
static inline unsigned darken_p(unsigned src, unsigned dst,
unsigned src_mul, unsigned dst_mul) {
return ((dst_mul * src + src_mul * dst) >> 8) + SkMin32(src, dst);
}
static SkPMColor darken_modeproc(SkPMColor src, SkPMColor dst) {
unsigned sa = SkGetPackedA32(src);
unsigned da = SkGetPackedA32(dst);
unsigned src_scale = SkAlpha255To256(255 - sa);
unsigned dst_scale = SkAlpha255To256(255 - da);
unsigned ra = sa + da - SkAlphaMulAlpha(sa, da);
unsigned rr = darken_p(SkGetPackedR32(src), SkGetPackedR32(dst),
src_scale, dst_scale);
unsigned rg = darken_p(SkGetPackedG32(src), SkGetPackedG32(dst),
src_scale, dst_scale);
unsigned rb = darken_p(SkGetPackedB32(src), SkGetPackedB32(dst),
src_scale, dst_scale);
return SkPackARGB32(ra, SkFastMin32(rr, ra),
SkFastMin32(rg, ra), SkFastMin32(rb, ra));
}
// kLighten_Mode, [Sa + Da - Sa·Da, Sc·(1 - Da) + Dc·(1 - Sa) + max(Sc, Dc)]
static inline unsigned lighten_p(unsigned src, unsigned dst,
unsigned src_mul, unsigned dst_mul) {
return ((dst_mul * src + src_mul * dst) >> 8) + SkMax32(src, dst);
}
static SkPMColor lighten_modeproc(SkPMColor src, SkPMColor dst) {
unsigned sa = SkGetPackedA32(src);
unsigned da = SkGetPackedA32(dst);
unsigned src_scale = SkAlpha255To256(255 - sa);
unsigned dst_scale = SkAlpha255To256(255 - da);
unsigned ra = sa + da - SkAlphaMulAlpha(sa, da);
unsigned rr = lighten_p(SkGetPackedR32(src), SkGetPackedR32(dst),
src_scale, dst_scale);
unsigned rg = lighten_p(SkGetPackedG32(src), SkGetPackedG32(dst),
src_scale, dst_scale);
unsigned rb = lighten_p(SkGetPackedB32(src), SkGetPackedB32(dst),
src_scale, dst_scale);
return SkPackARGB32(ra, SkFastMin32(rr, ra),
SkFastMin32(rg, ra), SkFastMin32(rb, ra));
}
static SkPMColor mult_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);
}
static inline int screen_byte(int a, int b) {
return a + b - SkAlphaMulAlpha(a, b);
}
static SkPMColor screen_modeproc(SkPMColor src, SkPMColor dst) {
int a = screen_byte(SkGetPackedA32(src), SkGetPackedA32(dst));
int r = screen_byte(SkGetPackedR32(src), SkGetPackedR32(dst));
int g = screen_byte(SkGetPackedG32(src), SkGetPackedG32(dst));
int b = screen_byte(SkGetPackedB32(src), SkGetPackedB32(dst));
return SkPackARGB32(a, r, g, b);
}
///////////////////////////////////////////////////////////////////////////////
class SkClearXfermode : public SkProcCoeffXfermode {
public:
SkClearXfermode() : SkProcCoeffXfermode(clear_modeproc,
kZero_Coeff, kZero_Coeff) {}
virtual void xfer32(SK_RESTRICT SkPMColor dst[],
const SK_RESTRICT SkPMColor[], int count,
const SK_RESTRICT SkAlpha 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));
}
}
}
}
virtual void xferA8(SK_RESTRICT SkAlpha dst[],
const SK_RESTRICT SkPMColor[], int count,
const SK_RESTRICT SkAlpha 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);
}
}
}
}
virtual Factory getFactory() { return CreateProc; }
private:
SkClearXfermode(SkFlattenableReadBuffer& buffer)
: SkProcCoeffXfermode(buffer) {}
static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) {
return SkNEW_ARGS(SkClearXfermode, (buffer));
}
};
///////////////////////////////////////////////////////////////////////////////
class SkSrcXfermode : public SkProcCoeffXfermode {
public:
SkSrcXfermode() : SkProcCoeffXfermode(src_modeproc,
kOne_Coeff, kZero_Coeff) {}
virtual void xfer32(SK_RESTRICT SkPMColor dst[],
const SK_RESTRICT SkPMColor src[], int count,
const SK_RESTRICT SkAlpha 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);
}
}
}
}
virtual void xferA8(SK_RESTRICT SkAlpha dst[],
const SK_RESTRICT SkPMColor src[], int count,
const SK_RESTRICT SkAlpha 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));
}
}
}
}
}
virtual Factory getFactory() { return CreateProc; }
private:
SkSrcXfermode(SkFlattenableReadBuffer& buffer)
: SkProcCoeffXfermode(buffer) {}
static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) {
return SkNEW_ARGS(SkSrcXfermode, (buffer));
}
};
class SkDstInXfermode : public SkProcCoeffXfermode {
public:
SkDstInXfermode() : SkProcCoeffXfermode(dstin_modeproc,
kZero_Coeff, kSA_Coeff) {}
virtual void xfer32(SK_RESTRICT SkPMColor dst[],
const SK_RESTRICT SkPMColor src[], int count,
const SK_RESTRICT SkAlpha 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);
}
virtual Factory getFactory() { return CreateProc; }
private:
SkDstInXfermode(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {}
static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) {
return SkNEW_ARGS(SkDstInXfermode, (buffer));
}
typedef SkProcCoeffXfermode INHERITED;
};
class SkDstOutXfermode : public SkProcCoeffXfermode {
public:
SkDstOutXfermode() : SkProcCoeffXfermode(dstout_modeproc,
kZero_Coeff, kISA_Coeff) {}
virtual void xfer32(SK_RESTRICT SkPMColor dst[],
const SK_RESTRICT SkPMColor src[], int count,
const SK_RESTRICT SkAlpha 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);
}
virtual Factory getFactory() { return CreateProc; }
private:
SkDstOutXfermode(SkFlattenableReadBuffer& buffer)
: INHERITED(buffer) {}
static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) {
return SkNEW_ARGS(SkDstOutXfermode, (buffer));
}
typedef SkProcCoeffXfermode INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
#include "SkPorterDuff.h"
struct ProcCoeff {
SkXfermodeProc fProc;
SkXfermode::Coeff fSC;
SkXfermode::Coeff fDC;
};
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 },
// these two can't be represented as coefficients
{ darken_modeproc, SkXfermode::Coeff(-1), SkXfermode::Coeff(-1) },
{ lighten_modeproc, SkXfermode::Coeff(-1), SkXfermode::Coeff(-1) },
// these can use coefficients
{ mult_modeproc, SkXfermode::kZero_Coeff, SkXfermode::kSC_Coeff },
{ screen_modeproc, SkXfermode::kOne_Coeff, SkXfermode::kISC_Coeff }
};
SkXfermode* SkPorterDuff::CreateXfermode(SkPorterDuff::Mode mode) {
SkASSERT(SK_ARRAY_COUNT(gProcCoeffs) == SkPorterDuff::kModeCount);
SkASSERT((unsigned)mode < SkPorterDuff::kModeCount);
switch (mode) {
case kClear_Mode:
return SkNEW(SkClearXfermode);
case kSrc_Mode:
return SkNEW(SkSrcXfermode);
case kSrcOver_Mode:
return NULL;
case kDstIn_Mode:
return SkNEW(SkDstInXfermode);
case kDstOut_Mode:
return SkNEW(SkDstOutXfermode);
// these two can't be represented with Coeff
case kDarken_Mode:
return SkNEW_ARGS(SkProcXfermode, (darken_modeproc));
case kLighten_Mode:
return SkNEW_ARGS(SkProcXfermode, (lighten_modeproc));
// use the table
default: {
const ProcCoeff& rec = gProcCoeffs[mode];
SkASSERT((unsigned)rec.fSC < SkXfermode::kCoeffCount);
SkASSERT((unsigned)rec.fDC < SkXfermode::kCoeffCount);
return SkNEW_ARGS(SkProcCoeffXfermode, (rec.fProc,
rec.fSC, rec.fDC));
}
}
}
bool SkPorterDuff::IsMode(SkXfermode* xfer, Mode* mode) {
if (NULL == xfer) {
if (mode) {
*mode = kSrcOver_Mode;
}
return true;
}
SkXfermode::Coeff sc, dc;
if (xfer->asCoeff(&sc, &dc)) {
SkASSERT((unsigned)sc < (unsigned)SkXfermode::kCoeffCount);
SkASSERT((unsigned)dc < (unsigned)SkXfermode::kCoeffCount);
const ProcCoeff* rec = gProcCoeffs;
for (size_t i = 0; i < SK_ARRAY_COUNT(gProcCoeffs); i++) {
if (rec[i].fSC == sc && rec[i].fDC == dc) {
if (mode) {
*mode = SkPorterDuff::Mode(i);
}
return true;
}
}
}
// no coefficients, or not found in our table
return false;
}
///////////////////////////////////////////////////////////////////////////////
#ifdef SK_DEBUGx
static void unit_test() {
for (unsigned a = 0; a <= 255; a++) {
for (unsigned c = 0; c <= a; c++) {
SkPMColor pm = SkPackARGB32(a, c, c, c);
for (unsigned aa = 0; aa <= 255; aa++) {
for (unsigned cc = 0; cc <= aa; cc++) {
SkPMColor pm2 = SkPackARGB32(aa, cc, cc, cc);
const size_t N = SK_ARRAY_COUNT(gProcCoeffs);
for (size_t i = 0; i < N; i++) {
gProcCoeffs[i].fProc(pm, pm2);
}
}
}
}
}
}
#endif
SkXfermodeProc SkPorterDuff::GetXfermodeProc(Mode mode) {
#ifdef SK_DEBUGx
static bool gUnitTest;
if (!gUnitTest) {
gUnitTest = true;
unit_test();
}
#endif
SkXfermodeProc proc = NULL;
if ((unsigned)mode < SkPorterDuff::kModeCount) {
proc = gProcCoeffs[mode].fProc;
}
return proc;
}
///////////////////////////////////////////////////////////////////////////////
//////////// 16bit xfermode procs
#ifdef SK_DEBUG
static bool require_255(SkPMColor src) { return SkGetPackedA32(src) == 0xFF; }
static bool require_0(SkPMColor src) { return SkGetPackedA32(src) == 0; }
#endif
static uint16_t src_modeproc16_255(SkPMColor src, uint16_t dst) {
SkASSERT(require_255(src));
return SkPixel32ToPixel16(src);
}
static uint16_t dst_modeproc16(SkPMColor src, uint16_t dst) {
return dst;
}
static uint16_t srcover_modeproc16_0(SkPMColor src, uint16_t dst) {
SkASSERT(require_0(src));
return dst;
}
static uint16_t srcover_modeproc16_255(SkPMColor src, uint16_t dst) {
SkASSERT(require_255(src));
return SkPixel32ToPixel16(src);
}
static uint16_t dstover_modeproc16_0(SkPMColor src, uint16_t dst) {
SkASSERT(require_0(src));
return dst;
}
static uint16_t dstover_modeproc16_255(SkPMColor src, uint16_t dst) {
SkASSERT(require_255(src));
return dst;
}
static uint16_t srcin_modeproc16_255(SkPMColor src, uint16_t dst) {
SkASSERT(require_255(src));
return SkPixel32ToPixel16(src);
}
static uint16_t dstin_modeproc16_255(SkPMColor src, uint16_t dst) {
SkASSERT(require_255(src));
return dst;
}
static uint16_t dstout_modeproc16_0(SkPMColor src, uint16_t dst) {
SkASSERT(require_0(src));
return dst;
}
static uint16_t srcatop_modeproc16(SkPMColor src, uint16_t dst) {
unsigned isa = 255 - SkGetPackedA32(src);
return SkPackRGB16(
SkPacked32ToR16(src) + SkAlphaMulAlpha(SkGetPackedR16(dst), isa),
SkPacked32ToG16(src) + SkAlphaMulAlpha(SkGetPackedG16(dst), isa),
SkPacked32ToB16(src) + SkAlphaMulAlpha(SkGetPackedB16(dst), isa));
}
static uint16_t srcatop_modeproc16_0(SkPMColor src, uint16_t dst) {
SkASSERT(require_0(src));
return dst;
}
static uint16_t srcatop_modeproc16_255(SkPMColor src, uint16_t dst) {
SkASSERT(require_255(src));
return SkPixel32ToPixel16(src);
}
static uint16_t dstatop_modeproc16_255(SkPMColor src, uint16_t dst) {
SkASSERT(require_255(src));
return dst;
}
/*********
darken and lighten boil down to this.
darken = (1 - Sa) * Dc + min(Sc, Dc)
lighten = (1 - Sa) * Dc + max(Sc, Dc)
if (Sa == 0) these become
darken = Dc + min(0, Dc) = 0
lighten = Dc + max(0, Dc) = Dc
if (Sa == 1) these become
darken = min(Sc, Dc)
lighten = max(Sc, Dc)
*/
static uint16_t darken_modeproc16_0(SkPMColor src, uint16_t dst) {
SkASSERT(require_0(src));
return 0;
}
static uint16_t darken_modeproc16_255(SkPMColor src, uint16_t dst) {
SkASSERT(require_255(src));
unsigned r = SkFastMin32(SkPacked32ToR16(src), SkGetPackedR16(dst));
unsigned g = SkFastMin32(SkPacked32ToG16(src), SkGetPackedG16(dst));
unsigned b = SkFastMin32(SkPacked32ToB16(src), SkGetPackedB16(dst));
return SkPackRGB16(r, g, b);
}
static uint16_t lighten_modeproc16_0(SkPMColor src, uint16_t dst) {
SkASSERT(require_0(src));
return dst;
}
static uint16_t lighten_modeproc16_255(SkPMColor src, uint16_t dst) {
SkASSERT(require_255(src));
unsigned r = SkMax32(SkPacked32ToR16(src), SkGetPackedR16(dst));
unsigned g = SkMax32(SkPacked32ToG16(src), SkGetPackedG16(dst));
unsigned b = SkMax32(SkPacked32ToB16(src), SkGetPackedB16(dst));
return SkPackRGB16(r, g, b);
}
struct Proc16Rec {
SkXfermodeProc16 fProc16_0;
SkXfermodeProc16 fProc16_255;
SkXfermodeProc16 fProc16_General;
};
static const Proc16Rec gPorterDuffModeProcs16[] = {
{ NULL, NULL, NULL }, // CLEAR
{ NULL, src_modeproc16_255, NULL },
{ dst_modeproc16, dst_modeproc16, dst_modeproc16 },
{ srcover_modeproc16_0, srcover_modeproc16_255, NULL },
{ dstover_modeproc16_0, dstover_modeproc16_255, NULL },
{ NULL, srcin_modeproc16_255, NULL },
{ NULL, dstin_modeproc16_255, NULL },
{ NULL, NULL, NULL },// SRC_OUT
{ dstout_modeproc16_0, NULL, NULL },
{ srcatop_modeproc16_0, srcatop_modeproc16_255, srcatop_modeproc16 },
{ NULL, dstatop_modeproc16_255, NULL },
{ NULL, NULL, NULL }, // XOR
{ darken_modeproc16_0, darken_modeproc16_255, NULL },
{ lighten_modeproc16_0, lighten_modeproc16_255, NULL },
{ NULL, NULL, NULL },//multiply
{ NULL, NULL, NULL }// screen
};
SkXfermodeProc16 SkPorterDuff::GetXfermodeProc16(Mode mode, SkColor srcColor) {
SkXfermodeProc16 proc16 = NULL;
if ((unsigned)mode < SkPorterDuff::kModeCount) {
const Proc16Rec& rec = gPorterDuffModeProcs16[mode];
unsigned a = SkColorGetA(srcColor);
if (0 == a) {
proc16 = rec.fProc16_0;
} else if (255 == a) {
proc16 = rec.fProc16_255;
} else {
proc16 = rec.fProc16_General;
}
}
return proc16;
}