| /* |
| * 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); |
| } |
| |
| // 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; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| 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_DEBUG |
| 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; |
| } |
| |