diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/src/core/SkXfermode.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gfx/skia/trunk/src/core/SkXfermode.cpp Wed Dec 31 06:09:35 2014 +0100 @@ -0,0 +1,1992 @@ + +/* + * 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 "SkXfermode_proccoeff.h" +#include "SkColorPriv.h" +#include "SkReadBuffer.h" +#include "SkWriteBuffer.h" +#include "SkMathPriv.h" +#include "SkString.h" +#include "SkUtilsArm.h" + +#if !SK_ARM_NEON_IS_NONE +#include "SkXfermode_opts_arm_neon.h" +#endif + +#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); + } +} + +/////////////////////////////////////////////////////////////////////////////// + +// 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); +} + +// kModulate_Mode +static SkPMColor modulate_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 srcover_byte(int a, int b) { + return a + b - SkAlphaMulAlpha(a, b); +} + +// kMultiply_Mode +// B(Cb, Cs) = Cb x Cs +// multiply uses its own version of blendfunc_byte because sa and da are not needed +static int blendfunc_multiply_byte(int sc, int dc, int sa, int da) { + return clamp_div255round(sc * (255 - da) + dc * (255 - sa) + sc * dc); +} + +static SkPMColor multiply_modeproc(SkPMColor src, SkPMColor dst) { + int sa = SkGetPackedA32(src); + int da = SkGetPackedA32(dst); + int a = srcover_byte(sa, da); + int r = blendfunc_multiply_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da); + int g = blendfunc_multiply_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da); + int b = blendfunc_multiply_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da); + return SkPackARGB32(a, r, g, b); +} + +// kScreen_Mode +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 == dc) { + return SkAlphaMulAlpha(sc, 255 - da); + } else if (0 == diff) { + rc = sa * da + sc * (255 - da) + dc * (255 - sa); + } else { + diff = dc * sa / diff; + rc = sa * ((da < diff) ? da : diff) + sc * (255 - da) + dc * (255 - sa); + } + return clamp_div255round(rc); +} +static SkPMColor colordodge_modeproc(SkPMColor src, SkPMColor dst) { + 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); + 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) { + rc = sa * da + sc * (255 - da) + dc * (255 - sa); + } else if (0 == sc) { + return SkAlphaMulAlpha(dc, 255 - sa); + } else { + int tmp = (da - dc) * sa / sc; + rc = sa * (da - ((da < tmp) ? da : tmp)) + + sc * (255 - da) + dc * (255 - sa); + } + return clamp_div255round(rc); +} +static SkPMColor colorburn_modeproc(SkPMColor src, SkPMColor dst) { + 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, int) { + // 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); + + // The above equation can be simplified as follows + int r = 255*(sc + dc) - 2 * sc * dc; + 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); +} + +// The CSS compositing spec introduces the following formulas: +// (See https://dvcs.w3.org/hg/FXTF/rawfile/tip/compositing/index.html#blendingnonseparable) +// SkComputeLuminance is similar to this formula but it uses the new definition from Rec. 709 +// while PDF and CG uses the one from Rec. Rec. 601 +// See http://www.glennchan.info/articles/technical/hd-versus-sd-color-space/hd-versus-sd-color-space.htm +static inline int Lum(int r, int g, int b) +{ + return SkDiv255Round(r * 77 + g * 150 + b * 28); +} + +static inline int min2(int a, int b) { return a < b ? a : b; } +static inline int max2(int a, int b) { return a > b ? a : b; } +#define minimum(a, b, c) min2(min2(a, b), c) +#define maximum(a, b, c) max2(max2(a, b), c) + +static inline int Sat(int r, int g, int b) { + return maximum(r, g, b) - minimum(r, g, b); +} + +static inline void setSaturationComponents(int* Cmin, int* Cmid, int* Cmax, int s) { + if(*Cmax > *Cmin) { + *Cmid = SkMulDiv(*Cmid - *Cmin, s, *Cmax - *Cmin); + *Cmax = s; + } else { + *Cmax = 0; + *Cmid = 0; + } + + *Cmin = 0; +} + +static inline void SetSat(int* r, int* g, int* b, int s) { + if(*r <= *g) { + if(*g <= *b) { + setSaturationComponents(r, g, b, s); + } else if(*r <= *b) { + setSaturationComponents(r, b, g, s); + } else { + setSaturationComponents(b, r, g, s); + } + } else if(*r <= *b) { + setSaturationComponents(g, r, b, s); + } else if(*g <= *b) { + setSaturationComponents(g, b, r, s); + } else { + setSaturationComponents(b, g, r, s); + } +} + +static inline void clipColor(int* r, int* g, int* b, int a) { + int L = Lum(*r, *g, *b); + int n = minimum(*r, *g, *b); + int x = maximum(*r, *g, *b); + int denom; + if ((n < 0) && (denom = L - n)) { // Compute denom and make sure it's non zero + *r = L + SkMulDiv(*r - L, L, denom); + *g = L + SkMulDiv(*g - L, L, denom); + *b = L + SkMulDiv(*b - L, L, denom); + } + + if ((x > a) && (denom = x - L)) { // Compute denom and make sure it's non zero + int numer = a - L; + *r = L + SkMulDiv(*r - L, numer, denom); + *g = L + SkMulDiv(*g - L, numer, denom); + *b = L + SkMulDiv(*b - L, numer, denom); + } +} + +static inline void SetLum(int* r, int* g, int* b, int a, int l) { + int d = l - Lum(*r, *g, *b); + *r += d; + *g += d; + *b += d; + + clipColor(r, g, b, a); +} + +// non-separable blend modes are done in non-premultiplied alpha +#define blendfunc_nonsep_byte(sc, dc, sa, da, blendval) \ + clamp_div255round(sc * (255 - da) + dc * (255 - sa) + blendval) + +// kHue_Mode +// B(Cb, Cs) = SetLum(SetSat(Cs, Sat(Cb)), Lum(Cb)) +// Create a color with the hue of the source color and the saturation and luminosity of the backdrop color. +static SkPMColor hue_modeproc(SkPMColor src, SkPMColor dst) { + int sr = SkGetPackedR32(src); + int sg = SkGetPackedG32(src); + int sb = SkGetPackedB32(src); + int sa = SkGetPackedA32(src); + + int dr = SkGetPackedR32(dst); + int dg = SkGetPackedG32(dst); + int db = SkGetPackedB32(dst); + int da = SkGetPackedA32(dst); + int Sr, Sg, Sb; + + if(sa && da) { + Sr = sr * sa; + Sg = sg * sa; + Sb = sb * sa; + SetSat(&Sr, &Sg, &Sb, Sat(dr, dg, db) * sa); + SetLum(&Sr, &Sg, &Sb, sa * da, Lum(dr, dg, db) * sa); + } else { + Sr = 0; + Sg = 0; + Sb = 0; + } + + int a = srcover_byte(sa, da); + int r = blendfunc_nonsep_byte(sr, dr, sa, da, Sr); + int g = blendfunc_nonsep_byte(sg, dg, sa, da, Sg); + int b = blendfunc_nonsep_byte(sb, db, sa, da, Sb); + return SkPackARGB32(a, r, g, b); +} + +// kSaturation_Mode +// B(Cb, Cs) = SetLum(SetSat(Cb, Sat(Cs)), Lum(Cb)) +// Create a color with the saturation of the source color and the hue and luminosity of the backdrop color. +static SkPMColor saturation_modeproc(SkPMColor src, SkPMColor dst) { + int sr = SkGetPackedR32(src); + int sg = SkGetPackedG32(src); + int sb = SkGetPackedB32(src); + int sa = SkGetPackedA32(src); + + int dr = SkGetPackedR32(dst); + int dg = SkGetPackedG32(dst); + int db = SkGetPackedB32(dst); + int da = SkGetPackedA32(dst); + int Dr, Dg, Db; + + if(sa && da) { + Dr = dr * sa; + Dg = dg * sa; + Db = db * sa; + SetSat(&Dr, &Dg, &Db, Sat(sr, sg, sb) * da); + SetLum(&Dr, &Dg, &Db, sa * da, Lum(dr, dg, db) * sa); + } else { + Dr = 0; + Dg = 0; + Db = 0; + } + + int a = srcover_byte(sa, da); + int r = blendfunc_nonsep_byte(sr, dr, sa, da, Dr); + int g = blendfunc_nonsep_byte(sg, dg, sa, da, Dg); + int b = blendfunc_nonsep_byte(sb, db, sa, da, Db); + return SkPackARGB32(a, r, g, b); +} + +// kColor_Mode +// B(Cb, Cs) = SetLum(Cs, Lum(Cb)) +// Create a color with the hue and saturation of the source color and the luminosity of the backdrop color. +static SkPMColor color_modeproc(SkPMColor src, SkPMColor dst) { + int sr = SkGetPackedR32(src); + int sg = SkGetPackedG32(src); + int sb = SkGetPackedB32(src); + int sa = SkGetPackedA32(src); + + int dr = SkGetPackedR32(dst); + int dg = SkGetPackedG32(dst); + int db = SkGetPackedB32(dst); + int da = SkGetPackedA32(dst); + int Sr, Sg, Sb; + + if(sa && da) { + Sr = sr * da; + Sg = sg * da; + Sb = sb * da; + SetLum(&Sr, &Sg, &Sb, sa * da, Lum(dr, dg, db) * sa); + } else { + Sr = 0; + Sg = 0; + Sb = 0; + } + + int a = srcover_byte(sa, da); + int r = blendfunc_nonsep_byte(sr, dr, sa, da, Sr); + int g = blendfunc_nonsep_byte(sg, dg, sa, da, Sg); + int b = blendfunc_nonsep_byte(sb, db, sa, da, Sb); + return SkPackARGB32(a, r, g, b); +} + +// kLuminosity_Mode +// B(Cb, Cs) = SetLum(Cb, Lum(Cs)) +// Create a color with the luminosity of the source color and the hue and saturation of the backdrop color. +static SkPMColor luminosity_modeproc(SkPMColor src, SkPMColor dst) { + int sr = SkGetPackedR32(src); + int sg = SkGetPackedG32(src); + int sb = SkGetPackedB32(src); + int sa = SkGetPackedA32(src); + + int dr = SkGetPackedR32(dst); + int dg = SkGetPackedG32(dst); + int db = SkGetPackedB32(dst); + int da = SkGetPackedA32(dst); + int Dr, Dg, Db; + + if(sa && da) { + Dr = dr * sa; + Dg = dg * sa; + Db = db * sa; + SetLum(&Dr, &Dg, &Db, sa * da, Lum(sr, sg, sb) * da); + } else { + Dr = 0; + Dg = 0; + Db = 0; + } + + int a = srcover_byte(sa, da); + int r = blendfunc_nonsep_byte(sr, dr, sa, da, Dr); + int g = blendfunc_nonsep_byte(sg, dg, sa, da, Dg); + int b = blendfunc_nonsep_byte(sb, db, sa, da, Db); + return SkPackARGB32(a, r, g, b); +} + +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 }, + { modulate_modeproc,SkXfermode::kZero_Coeff, SkXfermode::kSC_Coeff }, + { screen_modeproc, SkXfermode::kOne_Coeff, SkXfermode::kISC_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 }, + { multiply_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF }, + { hue_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF }, + { saturation_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF }, + { color_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF }, + { luminosity_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF }, +}; + +/////////////////////////////////////////////////////////////////////////////// + +bool SkXfermode::asCoeff(Coeff* src, Coeff* dst) const { + return false; +} + +bool SkXfermode::asMode(Mode* mode) const { + return false; +} + +bool SkXfermode::asNewEffect(GrEffectRef** effect, GrTexture* background) const { + return false; +} + +bool SkXfermode::AsNewEffectOrCoeff(SkXfermode* xfermode, + GrEffectRef** effect, + Coeff* src, + Coeff* dst, + GrTexture* background) { + if (NULL == xfermode) { + return ModeAsCoeff(kSrcOver_Mode, src, dst); + } else if (xfermode->asCoeff(src, dst)) { + return true; + } else { + return xfermode->asNewEffect(effect, background); + } +} + +SkPMColor SkXfermode::xferColor(SkPMColor src, SkPMColor dst) const{ + // 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) const { + 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) const { + 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::xferA8(SkAlpha* SK_RESTRICT dst, + const SkPMColor src[], int count, + const SkAlpha* SK_RESTRICT aa) const { + 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) const { + 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) const { + 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::xferA8(SkAlpha* SK_RESTRICT dst, + const SkPMColor* SK_RESTRICT src, int count, + const SkAlpha* SK_RESTRICT aa) const { + 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(SkReadBuffer& buffer) + : SkXfermode(buffer) { + fProc = NULL; + if (!buffer.isCrossProcess()) { + fProc = (SkXfermodeProc)buffer.readFunctionPtr(); + } +} + +void SkProcXfermode::flatten(SkWriteBuffer& buffer) const { + this->INHERITED::flatten(buffer); + if (!buffer.isCrossProcess()) { + buffer.writeFunctionPtr((void*)fProc); + } +} + +#ifndef SK_IGNORE_TO_STRING +void SkProcXfermode::toString(SkString* str) const { + str->appendf("SkProcXfermode: %p", fProc); +} +#endif + +////////////////////////////////////////////////////////////////////////////// + +#if SK_SUPPORT_GPU + +#include "GrEffect.h" +#include "GrCoordTransform.h" +#include "GrEffectUnitTest.h" +#include "GrTBackendEffectFactory.h" +#include "gl/GrGLEffect.h" + +/** + * GrEffect that implements the all the separable xfer modes that cannot be expressed as Coeffs. + */ +class XferEffect : public GrEffect { +public: + static bool IsSupportedMode(SkXfermode::Mode mode) { + return mode > SkXfermode::kLastCoeffMode && mode <= SkXfermode::kLastMode; + } + + static GrEffectRef* Create(SkXfermode::Mode mode, GrTexture* background) { + if (!IsSupportedMode(mode)) { + return NULL; + } else { + AutoEffectUnref effect(SkNEW_ARGS(XferEffect, (mode, background))); + return CreateEffectRef(effect); + } + } + + virtual void getConstantColorComponents(GrColor* color, + uint32_t* validFlags) const SK_OVERRIDE { + *validFlags = 0; + } + + virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE { + return GrTBackendEffectFactory::getInstance(); + } + + static const char* Name() { return "XferEffect"; } + + SkXfermode::Mode mode() const { return fMode; } + const GrTextureAccess& backgroundAccess() const { return fBackgroundAccess; } + + class GLEffect : public GrGLEffect { + public: + GLEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&) + : GrGLEffect(factory) { + } + virtual void emitCode(GrGLShaderBuilder* builder, + const GrDrawEffect& drawEffect, + EffectKey key, + const char* outputColor, + const char* inputColor, + const TransformedCoordsArray& coords, + const TextureSamplerArray& samplers) SK_OVERRIDE { + SkXfermode::Mode mode = drawEffect.castEffect().mode(); + const GrTexture* backgroundTex = drawEffect.castEffect().backgroundAccess().getTexture(); + const char* dstColor; + if (backgroundTex) { + dstColor = "bgColor"; + builder->fsCodeAppendf("\t\tvec4 %s = ", dstColor); + builder->fsAppendTextureLookup(samplers[0], coords[0].c_str(), coords[0].type()); + builder->fsCodeAppendf(";\n"); + } else { + dstColor = builder->dstColor(); + } + SkASSERT(NULL != dstColor); + + // We don't try to optimize for this case at all + if (NULL == inputColor) { + builder->fsCodeAppendf("\t\tconst vec4 ones = vec4(1);\n"); + inputColor = "ones"; + } + builder->fsCodeAppendf("\t\t// SkXfermode::Mode: %s\n", SkXfermode::ModeName(mode)); + + // These all perform src-over on the alpha channel. + builder->fsCodeAppendf("\t\t%s.a = %s.a + (1.0 - %s.a) * %s.a;\n", + outputColor, inputColor, inputColor, dstColor); + + switch (mode) { + case SkXfermode::kOverlay_Mode: + // Overlay is Hard-Light with the src and dst reversed + HardLight(builder, outputColor, dstColor, inputColor); + break; + case SkXfermode::kDarken_Mode: + builder->fsCodeAppendf("\t\t%s.rgb = min((1.0 - %s.a) * %s.rgb + %s.rgb, " + "(1.0 - %s.a) * %s.rgb + %s.rgb);\n", + outputColor, + inputColor, dstColor, inputColor, + dstColor, inputColor, dstColor); + break; + case SkXfermode::kLighten_Mode: + builder->fsCodeAppendf("\t\t%s.rgb = max((1.0 - %s.a) * %s.rgb + %s.rgb, " + "(1.0 - %s.a) * %s.rgb + %s.rgb);\n", + outputColor, + inputColor, dstColor, inputColor, + dstColor, inputColor, dstColor); + break; + case SkXfermode::kColorDodge_Mode: + ColorDodgeComponent(builder, outputColor, inputColor, dstColor, 'r'); + ColorDodgeComponent(builder, outputColor, inputColor, dstColor, 'g'); + ColorDodgeComponent(builder, outputColor, inputColor, dstColor, 'b'); + break; + case SkXfermode::kColorBurn_Mode: + ColorBurnComponent(builder, outputColor, inputColor, dstColor, 'r'); + ColorBurnComponent(builder, outputColor, inputColor, dstColor, 'g'); + ColorBurnComponent(builder, outputColor, inputColor, dstColor, 'b'); + break; + case SkXfermode::kHardLight_Mode: + HardLight(builder, outputColor, inputColor, dstColor); + break; + case SkXfermode::kSoftLight_Mode: + builder->fsCodeAppendf("\t\tif (0.0 == %s.a) {\n", dstColor); + builder->fsCodeAppendf("\t\t\t%s.rgba = %s;\n", outputColor, inputColor); + builder->fsCodeAppendf("\t\t} else {\n"); + SoftLightComponentPosDstAlpha(builder, outputColor, inputColor, dstColor, 'r'); + SoftLightComponentPosDstAlpha(builder, outputColor, inputColor, dstColor, 'g'); + SoftLightComponentPosDstAlpha(builder, outputColor, inputColor, dstColor, 'b'); + builder->fsCodeAppendf("\t\t}\n"); + break; + case SkXfermode::kDifference_Mode: + builder->fsCodeAppendf("\t\t%s.rgb = %s.rgb + %s.rgb -" + "2.0 * min(%s.rgb * %s.a, %s.rgb * %s.a);\n", + outputColor, inputColor, dstColor, inputColor, dstColor, + dstColor, inputColor); + break; + case SkXfermode::kExclusion_Mode: + builder->fsCodeAppendf("\t\t%s.rgb = %s.rgb + %s.rgb - " + "2.0 * %s.rgb * %s.rgb;\n", + outputColor, dstColor, inputColor, dstColor, inputColor); + break; + case SkXfermode::kMultiply_Mode: + builder->fsCodeAppendf("\t\t%s.rgb = (1.0 - %s.a) * %s.rgb + " + "(1.0 - %s.a) * %s.rgb + " + "%s.rgb * %s.rgb;\n", + outputColor, inputColor, dstColor, dstColor, inputColor, + inputColor, dstColor); + break; + case SkXfermode::kHue_Mode: { + // SetLum(SetSat(S * Da, Sat(D * Sa)), Sa*Da, D*Sa) + (1 - Sa) * D + (1 - Da) * S + SkString setSat, setLum; + AddSatFunction(builder, &setSat); + AddLumFunction(builder, &setLum); + builder->fsCodeAppendf("\t\tvec4 dstSrcAlpha = %s * %s.a;\n", + dstColor, inputColor); + builder->fsCodeAppendf("\t\t%s.rgb = %s(%s(%s.rgb * %s.a, dstSrcAlpha.rgb), dstSrcAlpha.a, dstSrcAlpha.rgb);\n", + outputColor, setLum.c_str(), setSat.c_str(), inputColor, + dstColor); + builder->fsCodeAppendf("\t\t%s.rgb += (1.0 - %s.a) * %s.rgb + (1.0 - %s.a) * %s.rgb;\n", + outputColor, inputColor, dstColor, dstColor, inputColor); + break; + } + case SkXfermode::kSaturation_Mode: { + // SetLum(SetSat(D * Sa, Sat(S * Da)), Sa*Da, D*Sa)) + (1 - Sa) * D + (1 - Da) * S + SkString setSat, setLum; + AddSatFunction(builder, &setSat); + AddLumFunction(builder, &setLum); + builder->fsCodeAppendf("\t\tvec4 dstSrcAlpha = %s * %s.a;\n", + dstColor, inputColor); + builder->fsCodeAppendf("\t\t%s.rgb = %s(%s(dstSrcAlpha.rgb, %s.rgb * %s.a), dstSrcAlpha.a, dstSrcAlpha.rgb);\n", + outputColor, setLum.c_str(), setSat.c_str(), inputColor, + dstColor); + builder->fsCodeAppendf("\t\t%s.rgb += (1.0 - %s.a) * %s.rgb + (1.0 - %s.a) * %s.rgb;\n", + outputColor, inputColor, dstColor, dstColor, inputColor); + break; + } + case SkXfermode::kColor_Mode: { + // SetLum(S * Da, Sa* Da, D * Sa) + (1 - Sa) * D + (1 - Da) * S + SkString setLum; + AddLumFunction(builder, &setLum); + builder->fsCodeAppendf("\t\tvec4 srcDstAlpha = %s * %s.a;\n", + inputColor, dstColor); + builder->fsCodeAppendf("\t\t%s.rgb = %s(srcDstAlpha.rgb, srcDstAlpha.a, %s.rgb * %s.a);\n", + outputColor, setLum.c_str(), dstColor, inputColor); + builder->fsCodeAppendf("\t\t%s.rgb += (1.0 - %s.a) * %s.rgb + (1.0 - %s.a) * %s.rgb;\n", + outputColor, inputColor, dstColor, dstColor, inputColor); + break; + } + case SkXfermode::kLuminosity_Mode: { + // SetLum(D * Sa, Sa* Da, S * Da) + (1 - Sa) * D + (1 - Da) * S + SkString setLum; + AddLumFunction(builder, &setLum); + builder->fsCodeAppendf("\t\tvec4 srcDstAlpha = %s * %s.a;\n", + inputColor, dstColor); + builder->fsCodeAppendf("\t\t%s.rgb = %s(%s.rgb * %s.a, srcDstAlpha.a, srcDstAlpha.rgb);\n", + outputColor, setLum.c_str(), dstColor, inputColor); + builder->fsCodeAppendf("\t\t%s.rgb += (1.0 - %s.a) * %s.rgb + (1.0 - %s.a) * %s.rgb;\n", + outputColor, inputColor, dstColor, dstColor, inputColor); + break; + } + default: + GrCrash("Unknown XferEffect mode."); + break; + } + } + + static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) { + return drawEffect.castEffect().mode(); + } + + private: + static void HardLight(GrGLShaderBuilder* builder, + const char* final, + const char* src, + const char* dst) { + static const char kComponents[] = {'r', 'g', 'b'}; + for (size_t i = 0; i < SK_ARRAY_COUNT(kComponents); ++i) { + char component = kComponents[i]; + builder->fsCodeAppendf("\t\tif (2.0 * %s.%c <= %s.a) {\n", src, component, src); + builder->fsCodeAppendf("\t\t\t%s.%c = 2.0 * %s.%c * %s.%c;\n", final, component, src, component, dst, component); + builder->fsCodeAppend("\t\t} else {\n"); + builder->fsCodeAppendf("\t\t\t%s.%c = %s.a * %s.a - 2.0 * (%s.a - %s.%c) * (%s.a - %s.%c);\n", + final, component, src, dst, dst, dst, component, src, src, component); + builder->fsCodeAppend("\t\t}\n"); + } + builder->fsCodeAppendf("\t\t%s.rgb += %s.rgb * (1.0 - %s.a) + %s.rgb * (1.0 - %s.a);\n", + final, src, dst, dst, src); + } + + // Does one component of color-dodge + static void ColorDodgeComponent(GrGLShaderBuilder* builder, + const char* final, + const char* src, + const char* dst, + const char component) { + builder->fsCodeAppendf("\t\tif (0.0 == %s.%c) {\n", dst, component); + builder->fsCodeAppendf("\t\t\t%s.%c = %s.%c * (1.0 - %s.a);\n", + final, component, src, component, dst); + builder->fsCodeAppend("\t\t} else {\n"); + builder->fsCodeAppendf("\t\t\tfloat d = %s.a - %s.%c;\n", src, src, component); + builder->fsCodeAppend("\t\t\tif (0.0 == d) {\n"); + builder->fsCodeAppendf("\t\t\t\t%s.%c = %s.a * %s.a + %s.%c * (1.0 - %s.a) + %s.%c * (1.0 - %s.a);\n", + final, component, src, dst, src, component, dst, dst, component, + src); + builder->fsCodeAppend("\t\t\t} else {\n"); + builder->fsCodeAppendf("\t\t\t\td = min(%s.a, %s.%c * %s.a / d);\n", + dst, dst, component, src); + builder->fsCodeAppendf("\t\t\t\t%s.%c = d * %s.a + %s.%c * (1.0 - %s.a) + %s.%c * (1.0 - %s.a);\n", + final, component, src, src, component, dst, dst, component, src); + builder->fsCodeAppend("\t\t\t}\n"); + builder->fsCodeAppend("\t\t}\n"); + } + + // Does one component of color-burn + static void ColorBurnComponent(GrGLShaderBuilder* builder, + const char* final, + const char* src, + const char* dst, + const char component) { + builder->fsCodeAppendf("\t\tif (%s.a == %s.%c) {\n", dst, dst, component); + builder->fsCodeAppendf("\t\t\t%s.%c = %s.a * %s.a + %s.%c * (1.0 - %s.a) + %s.%c * (1.0 - %s.a);\n", + final, component, src, dst, src, component, dst, dst, component, + src); + builder->fsCodeAppendf("\t\t} else if (0.0 == %s.%c) {\n", src, component); + builder->fsCodeAppendf("\t\t\t%s.%c = %s.%c * (1.0 - %s.a);\n", + final, component, dst, component, src); + builder->fsCodeAppend("\t\t} else {\n"); + builder->fsCodeAppendf("\t\t\tfloat d = max(0.0, %s.a - (%s.a - %s.%c) * %s.a / %s.%c);\n", + dst, dst, dst, component, src, src, component); + builder->fsCodeAppendf("\t\t\t%s.%c = %s.a * d + %s.%c * (1.0 - %s.a) + %s.%c * (1.0 - %s.a);\n", + final, component, src, src, component, dst, dst, component, src); + builder->fsCodeAppend("\t\t}\n"); + } + + // Does one component of soft-light. Caller should have already checked that dst alpha > 0. + static void SoftLightComponentPosDstAlpha(GrGLShaderBuilder* builder, + const char* final, + const char* src, + const char* dst, + const char component) { + // if (2S < Sa) + builder->fsCodeAppendf("\t\t\tif (2.0 * %s.%c <= %s.a) {\n", src, component, src); + // (D^2 (Sa-2 S))/Da+(1-Da) S+D (-Sa+2 S+1) + builder->fsCodeAppendf("\t\t\t\t%s.%c = (%s.%c*%s.%c*(%s.a - 2.0*%s.%c)) / %s.a + (1.0 - %s.a) * %s.%c + %s.%c*(-%s.a + 2.0*%s.%c + 1.0);\n", + final, component, dst, component, dst, component, src, src, + component, dst, dst, src, component, dst, component, src, src, + component); + // else if (4D < Da) + builder->fsCodeAppendf("\t\t\t} else if (4.0 * %s.%c <= %s.a) {\n", + dst, component, dst); + builder->fsCodeAppendf("\t\t\t\tfloat DSqd = %s.%c * %s.%c;\n", + dst, component, dst, component); + builder->fsCodeAppendf("\t\t\t\tfloat DCub = DSqd * %s.%c;\n", dst, component); + builder->fsCodeAppendf("\t\t\t\tfloat DaSqd = %s.a * %s.a;\n", dst, dst); + builder->fsCodeAppendf("\t\t\t\tfloat DaCub = DaSqd * %s.a;\n", dst); + // (Da^3 (-S)+Da^2 (S-D (3 Sa-6 S-1))+12 Da D^2 (Sa-2 S)-16 D^3 (Sa-2 S))/Da^2 + builder->fsCodeAppendf("\t\t\t\t%s.%c = (-DaCub*%s.%c + DaSqd*(%s.%c - %s.%c * (3.0*%s.a - 6.0*%s.%c - 1.0)) + 12.0*%s.a*DSqd*(%s.a - 2.0*%s.%c) - 16.0*DCub * (%s.a - 2.0*%s.%c)) / DaSqd;\n", + final, component, src, component, src, component, dst, component, + src, src, component, dst, src, src, component, src, src, + component); + builder->fsCodeAppendf("\t\t\t} else {\n"); + // -sqrt(Da * D) (Sa-2 S)-Da S+D (Sa-2 S+1)+S + builder->fsCodeAppendf("\t\t\t\t%s.%c = -sqrt(%s.a*%s.%c)*(%s.a - 2.0*%s.%c) - %s.a*%s.%c + %s.%c*(%s.a - 2.0*%s.%c + 1.0) + %s.%c;\n", + final, component, dst, dst, component, src, src, component, dst, + src, component, dst, component, src, src, component, src, + component); + builder->fsCodeAppendf("\t\t\t}\n"); + } + + // Adds a function that takes two colors and an alpha as input. It produces a color with the + // hue and saturation of the first color, the luminosity of the second color, and the input + // alpha. It has this signature: + // vec3 set_luminance(vec3 hueSatColor, float alpha, vec3 lumColor). + static void AddLumFunction(GrGLShaderBuilder* builder, SkString* setLumFunction) { + // Emit a helper that gets the luminance of a color. + SkString getFunction; + GrGLShaderVar getLumArgs[] = { + GrGLShaderVar("color", kVec3f_GrSLType), + }; + SkString getLumBody("\treturn dot(vec3(0.3, 0.59, 0.11), color);\n"); + builder->fsEmitFunction(kFloat_GrSLType, + "luminance", + SK_ARRAY_COUNT(getLumArgs), getLumArgs, + getLumBody.c_str(), + &getFunction); + + // Emit the set luminance function. + GrGLShaderVar setLumArgs[] = { + GrGLShaderVar("hueSat", kVec3f_GrSLType), + GrGLShaderVar("alpha", kFloat_GrSLType), + GrGLShaderVar("lumColor", kVec3f_GrSLType), + }; + SkString setLumBody; + setLumBody.printf("\tfloat diff = %s(lumColor - hueSat);\n", getFunction.c_str()); + setLumBody.append("\tvec3 outColor = hueSat + diff;\n"); + setLumBody.appendf("\tfloat outLum = %s(outColor);\n", getFunction.c_str()); + setLumBody.append("\tfloat minComp = min(min(outColor.r, outColor.g), outColor.b);\n" + "\tfloat maxComp = max(max(outColor.r, outColor.g), outColor.b);\n" + "\tif (minComp < 0.0) {\n" + "\t\toutColor = outLum + ((outColor - vec3(outLum, outLum, outLum)) * outLum) / (outLum - minComp);\n" + "\t}\n" + "\tif (maxComp > alpha) {\n" + "\t\toutColor = outLum + ((outColor - vec3(outLum, outLum, outLum)) * (alpha - outLum)) / (maxComp - outLum);\n" + "\t}\n" + "\treturn outColor;\n"); + builder->fsEmitFunction(kVec3f_GrSLType, + "set_luminance", + SK_ARRAY_COUNT(setLumArgs), setLumArgs, + setLumBody.c_str(), + setLumFunction); + } + + // Adds a function that creates a color with the hue and luminosity of one input color and + // the saturation of another color. It will have this signature: + // float set_saturation(vec3 hueLumColor, vec3 satColor) + static void AddSatFunction(GrGLShaderBuilder* builder, SkString* setSatFunction) { + // Emit a helper that gets the saturation of a color + SkString getFunction; + GrGLShaderVar getSatArgs[] = { GrGLShaderVar("color", kVec3f_GrSLType) }; + SkString getSatBody; + getSatBody.printf("\treturn max(max(color.r, color.g), color.b) - " + "min(min(color.r, color.g), color.b);\n"); + builder->fsEmitFunction(kFloat_GrSLType, + "saturation", + SK_ARRAY_COUNT(getSatArgs), getSatArgs, + getSatBody.c_str(), + &getFunction); + + // Emit a helper that sets the saturation given sorted input channels. This used + // to use inout params for min, mid, and max components but that seems to cause + // problems on PowerVR drivers. So instead it returns a vec3 where r, g ,b are the + // adjusted min, mid, and max inputs, respectively. + SkString helperFunction; + GrGLShaderVar helperArgs[] = { + GrGLShaderVar("minComp", kFloat_GrSLType), + GrGLShaderVar("midComp", kFloat_GrSLType), + GrGLShaderVar("maxComp", kFloat_GrSLType), + GrGLShaderVar("sat", kFloat_GrSLType), + }; + static const char kHelperBody[] = "\tif (minComp < maxComp) {\n" + "\t\tvec3 result;\n" + "\t\tresult.r = 0.0;\n" + "\t\tresult.g = sat * (midComp - minComp) / (maxComp - minComp);\n" + "\t\tresult.b = sat;\n" + "\t\treturn result;\n" + "\t} else {\n" + "\t\treturn vec3(0, 0, 0);\n" + "\t}\n"; + builder->fsEmitFunction(kVec3f_GrSLType, + "set_saturation_helper", + SK_ARRAY_COUNT(helperArgs), helperArgs, + kHelperBody, + &helperFunction); + + GrGLShaderVar setSatArgs[] = { + GrGLShaderVar("hueLumColor", kVec3f_GrSLType), + GrGLShaderVar("satColor", kVec3f_GrSLType), + }; + const char* helpFunc = helperFunction.c_str(); + SkString setSatBody; + setSatBody.appendf("\tfloat sat = %s(satColor);\n" + "\tif (hueLumColor.r <= hueLumColor.g) {\n" + "\t\tif (hueLumColor.g <= hueLumColor.b) {\n" + "\t\t\thueLumColor.rgb = %s(hueLumColor.r, hueLumColor.g, hueLumColor.b, sat);\n" + "\t\t} else if (hueLumColor.r <= hueLumColor.b) {\n" + "\t\t\thueLumColor.rbg = %s(hueLumColor.r, hueLumColor.b, hueLumColor.g, sat);\n" + "\t\t} else {\n" + "\t\t\thueLumColor.brg = %s(hueLumColor.b, hueLumColor.r, hueLumColor.g, sat);\n" + "\t\t}\n" + "\t} else if (hueLumColor.r <= hueLumColor.b) {\n" + "\t\thueLumColor.grb = %s(hueLumColor.g, hueLumColor.r, hueLumColor.b, sat);\n" + "\t} else if (hueLumColor.g <= hueLumColor.b) {\n" + "\t\thueLumColor.gbr = %s(hueLumColor.g, hueLumColor.b, hueLumColor.r, sat);\n" + "\t} else {\n" + "\t\thueLumColor.bgr = %s(hueLumColor.b, hueLumColor.g, hueLumColor.r, sat);\n" + "\t}\n" + "\treturn hueLumColor;\n", + getFunction.c_str(), helpFunc, helpFunc, helpFunc, helpFunc, + helpFunc, helpFunc); + builder->fsEmitFunction(kVec3f_GrSLType, + "set_saturation", + SK_ARRAY_COUNT(setSatArgs), setSatArgs, + setSatBody.c_str(), + setSatFunction); + + } + + typedef GrGLEffect INHERITED; + }; + + GR_DECLARE_EFFECT_TEST; + +private: + XferEffect(SkXfermode::Mode mode, GrTexture* background) + : fMode(mode) { + if (background) { + fBackgroundTransform.reset(kLocal_GrCoordSet, background); + this->addCoordTransform(&fBackgroundTransform); + fBackgroundAccess.reset(background); + this->addTextureAccess(&fBackgroundAccess); + } else { + this->setWillReadDstColor(); + } + } + virtual bool onIsEqual(const GrEffect& other) const SK_OVERRIDE { + const XferEffect& s = CastEffect(other); + return fMode == s.fMode && + fBackgroundAccess.getTexture() == s.fBackgroundAccess.getTexture(); + } + + SkXfermode::Mode fMode; + GrCoordTransform fBackgroundTransform; + GrTextureAccess fBackgroundAccess; + + typedef GrEffect INHERITED; +}; + +GR_DEFINE_EFFECT_TEST(XferEffect); +GrEffectRef* XferEffect::TestCreate(SkRandom* rand, + GrContext*, + const GrDrawTargetCaps&, + GrTexture*[]) { + int mode = rand->nextRangeU(SkXfermode::kLastCoeffMode + 1, SkXfermode::kLastSeparableMode); + + AutoEffectUnref gEffect(SkNEW_ARGS(XferEffect, (static_cast(mode), NULL))); + return CreateEffectRef(gEffect); +} + +#endif + +/////////////////////////////////////////////////////////////////////////////// +/////////////////////////////////////////////////////////////////////////////// + +SkProcCoeffXfermode::SkProcCoeffXfermode(SkReadBuffer& buffer) : INHERITED(buffer) { + uint32_t mode32 = buffer.read32() % SK_ARRAY_COUNT(gProcCoeffs); + if (mode32 >= SK_ARRAY_COUNT(gProcCoeffs)) { + // out of range, just set to something harmless + mode32 = SkXfermode::kSrcOut_Mode; + } + fMode = (SkXfermode::Mode)mode32; + + 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); +} + +bool SkProcCoeffXfermode::asMode(Mode* mode) const { + if (mode) { + *mode = fMode; + } + return true; +} + +bool SkProcCoeffXfermode::asCoeff(Coeff* sc, Coeff* dc) const { + if (CANNOT_USE_COEFF == fSrcCoeff) { + return false; + } + + if (sc) { + *sc = fSrcCoeff; + } + if (dc) { + *dc = fDstCoeff; + } + return true; +} + +#if SK_SUPPORT_GPU +bool SkProcCoeffXfermode::asNewEffect(GrEffectRef** effect, + GrTexture* background) const { + if (XferEffect::IsSupportedMode(fMode)) { + if (NULL != effect) { + *effect = XferEffect::Create(fMode, background); + SkASSERT(NULL != *effect); + } + return true; + } + return false; +} +#endif + +void SkProcCoeffXfermode::flatten(SkWriteBuffer& buffer) const { + this->INHERITED::flatten(buffer); + buffer.write32(fMode); +} + +const char* SkXfermode::ModeName(Mode mode) { + SkASSERT((unsigned) mode <= (unsigned)kLastMode); + const char* gModeStrings[] = { + "Clear", "Src", "Dst", "SrcOver", "DstOver", "SrcIn", "DstIn", + "SrcOut", "DstOut", "SrcATop", "DstATop", "Xor", "Plus", + "Modulate", "Screen", "Overlay", "Darken", "Lighten", "ColorDodge", + "ColorBurn", "HardLight", "SoftLight", "Difference", "Exclusion", + "Multiply", "Hue", "Saturation", "Color", "Luminosity" + }; + return gModeStrings[mode]; + SK_COMPILE_ASSERT(SK_ARRAY_COUNT(gModeStrings) == kLastMode + 1, mode_count); +} + +#ifndef SK_IGNORE_TO_STRING +void SkProcCoeffXfermode::toString(SkString* str) const { + str->append("SkProcCoeffXfermode: "); + + str->append("mode: "); + str->append(ModeName(fMode)); + + static const char* gCoeffStrings[kCoeffCount] = { + "Zero", "One", "SC", "ISC", "DC", "IDC", "SA", "ISA", "DA", "IDA" + }; + + str->append(" src: "); + if (CANNOT_USE_COEFF == fSrcCoeff) { + str->append("can't use"); + } else { + str->append(gCoeffStrings[fSrcCoeff]); + } + + str->append(" dst: "); + if (CANNOT_USE_COEFF == fDstCoeff) { + str->append("can't use"); + } else { + str->append(gCoeffStrings[fDstCoeff]); + } +} +#endif + +/////////////////////////////////////////////////////////////////////////////// + +class SkClearXfermode : public SkProcCoeffXfermode { +public: + static SkClearXfermode* Create(const ProcCoeff& rec) { + return SkNEW_ARGS(SkClearXfermode, (rec)); + } + + virtual void xfer32(SkPMColor*, const SkPMColor*, int, const SkAlpha*) const SK_OVERRIDE; + virtual void xferA8(SkAlpha*, const SkPMColor*, int, const SkAlpha*) const SK_OVERRIDE; + + SK_TO_STRING_OVERRIDE() + SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkClearXfermode) + +private: + SkClearXfermode(const ProcCoeff& rec) : SkProcCoeffXfermode(rec, kClear_Mode) {} + SkClearXfermode(SkReadBuffer& buffer) + : SkProcCoeffXfermode(buffer) {} + + typedef SkProcCoeffXfermode INHERITED; +}; + +void SkClearXfermode::xfer32(SkPMColor* SK_RESTRICT dst, + const SkPMColor* SK_RESTRICT, int count, + const SkAlpha* SK_RESTRICT aa) const { + 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) const { + 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); + } + } + } +} + +#ifndef SK_IGNORE_TO_STRING +void SkClearXfermode::toString(SkString* str) const { + this->INHERITED::toString(str); +} +#endif + +/////////////////////////////////////////////////////////////////////////////// + +class SkSrcXfermode : public SkProcCoeffXfermode { +public: + static SkSrcXfermode* Create(const ProcCoeff& rec) { + return SkNEW_ARGS(SkSrcXfermode, (rec)); + } + + virtual void xfer32(SkPMColor*, const SkPMColor*, int, const SkAlpha*) const SK_OVERRIDE; + virtual void xferA8(SkAlpha*, const SkPMColor*, int, const SkAlpha*) const SK_OVERRIDE; + + SK_TO_STRING_OVERRIDE() + SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkSrcXfermode) + +private: + SkSrcXfermode(const ProcCoeff& rec) : SkProcCoeffXfermode(rec, kSrc_Mode) {} + SkSrcXfermode(SkReadBuffer& buffer) + : SkProcCoeffXfermode(buffer) {} + + typedef SkProcCoeffXfermode INHERITED; +}; + +void SkSrcXfermode::xfer32(SkPMColor* SK_RESTRICT dst, + const SkPMColor* SK_RESTRICT src, int count, + const SkAlpha* SK_RESTRICT aa) const { + 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) const { + 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)); + } + } + } + } +} +#ifndef SK_IGNORE_TO_STRING +void SkSrcXfermode::toString(SkString* str) const { + this->INHERITED::toString(str); +} +#endif + +/////////////////////////////////////////////////////////////////////////////// + +class SkDstInXfermode : public SkProcCoeffXfermode { +public: + static SkDstInXfermode* Create(const ProcCoeff& rec) { + return SkNEW_ARGS(SkDstInXfermode, (rec)); + } + + virtual void xfer32(SkPMColor*, const SkPMColor*, int, const SkAlpha*) const SK_OVERRIDE; + + SK_TO_STRING_OVERRIDE() + SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDstInXfermode) + +private: + SkDstInXfermode(const ProcCoeff& rec) : SkProcCoeffXfermode(rec, kDstIn_Mode) {} + SkDstInXfermode(SkReadBuffer& 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) const { + 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); +} + +#ifndef SK_IGNORE_TO_STRING +void SkDstInXfermode::toString(SkString* str) const { + this->INHERITED::toString(str); +} +#endif + +/////////////////////////////////////////////////////////////////////////////// + +class SkDstOutXfermode : public SkProcCoeffXfermode { +public: + static SkDstOutXfermode* Create(const ProcCoeff& rec) { + return SkNEW_ARGS(SkDstOutXfermode, (rec)); + } + + virtual void xfer32(SkPMColor*, const SkPMColor*, int, const SkAlpha*) const SK_OVERRIDE; + + SK_TO_STRING_OVERRIDE() + SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDstOutXfermode) + +private: + SkDstOutXfermode(const ProcCoeff& rec) : SkProcCoeffXfermode(rec, kDstOut_Mode) {} + SkDstOutXfermode(SkReadBuffer& 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) const { + 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); +} + +#ifndef SK_IGNORE_TO_STRING +void SkDstOutXfermode::toString(SkString* str) const { + this->INHERITED::toString(str); +} +#endif + +/////////////////////////////////////////////////////////////////////////////// + +SK_DECLARE_STATIC_MUTEX(gCachedXfermodesMutex); +static SkXfermode* gCachedXfermodes[SkXfermode::kLastMode + 1]; + +void SkXfermode::Term() { + SkAutoMutexAcquire ac(gCachedXfermodesMutex); + + for (size_t i = 0; i < SK_ARRAY_COUNT(gCachedXfermodes); ++i) { + SkSafeUnref(gCachedXfermodes[i]); + gCachedXfermodes[i] = NULL; + } +} + +extern SkProcCoeffXfermode* SkPlatformXfermodeFactory(const ProcCoeff& rec, + SkXfermode::Mode mode); +extern SkXfermodeProc SkPlatformXfermodeProcFactory(SkXfermode::Mode mode); + +SkXfermode* SkXfermode::Create(Mode mode) { + SkASSERT(SK_ARRAY_COUNT(gProcCoeffs) == kModeCount); + SkASSERT(SK_ARRAY_COUNT(gCachedXfermodes) == kModeCount); + + if ((unsigned)mode >= kModeCount) { + // report error + return NULL; + } + + // Skia's "defaut" mode is srcover. NULL in SkPaint is interpreted as srcover + // so we can just return NULL from the factory. + if (kSrcOver_Mode == mode) { + return NULL; + } + + // guard our access to gCachedXfermodes, since we may write into it + SkAutoMutexAcquire ac(gCachedXfermodesMutex); + + SkXfermode* xfer = gCachedXfermodes[mode]; + if (NULL == xfer) { + ProcCoeff rec = gProcCoeffs[mode]; + + SkXfermodeProc pp = SkPlatformXfermodeProcFactory(mode); + + if (pp != NULL) { + rec.fProc = pp; + } + + // check if we have a platform optim for that + SkProcCoeffXfermode* xfm = SkPlatformXfermodeFactory(rec, mode); + if (xfm != NULL) { + xfer = xfm; + } else { + // All modes can in theory be represented by the ProcCoeff rec, since + // it contains function ptrs. However, a few modes are both simple and + // commonly used, so we call those out for their own subclasses here. + switch (mode) { + case kClear_Mode: + xfer = SkClearXfermode::Create(rec); + break; + case kSrc_Mode: + xfer = SkSrcXfermode::Create(rec); + break; + case kSrcOver_Mode: + SkASSERT(false); // should not land here + break; + case kDstIn_Mode: + xfer = SkDstInXfermode::Create(rec); + break; + case kDstOut_Mode: + xfer = SkDstOutXfermode::Create(rec); + break; + default: + // no special-case, just rely in the rec and its function-ptrs + xfer = SkProcCoeffXfermode::Create(rec, mode); + break; + } + } + gCachedXfermodes[mode] = xfer; + } + return SkSafeRef(xfer); +} + +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) { + SkASSERT(SK_ARRAY_COUNT(gProcCoeffs) == kModeCount); + + if ((unsigned)mode >= (unsigned)kModeCount) { + // illegal mode parameter + return false; + } + + const ProcCoeff& rec = gProcCoeffs[mode]; + + if (CANNOT_USE_COEFF == rec.fSC) { + return false; + } + + SkASSERT(CANNOT_USE_COEFF != rec.fDC); + if (src) { + *src = rec.fSC; + } + if (dst) { + *dst = rec.fDC; + } + return true; +} + +bool SkXfermode::AsMode(const SkXfermode* xfer, Mode* mode) { + if (NULL == xfer) { + if (mode) { + *mode = kSrcOver_Mode; + } + return true; + } + return xfer->asMode(mode); +} + +bool SkXfermode::AsCoeff(const SkXfermode* xfer, Coeff* src, Coeff* dst) { + if (NULL == xfer) { + return ModeAsCoeff(kSrcOver_Mode, src, dst); + } + return xfer->asCoeff(src, dst); +} + +bool SkXfermode::IsMode(const SkXfermode* xfer, Mode mode) { + // if xfer==null then the mode is srcover + Mode m = kSrcOver_Mode; + if (xfer && !xfer->asMode(&m)) { + return false; + } + return mode == m; +} + +/////////////////////////////////////////////////////////////////////////////// +//////////// 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 gModeProcs16[] = { + { 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 + + { NULL, NULL, NULL }, // plus + { NULL, NULL, NULL }, // modulate + { NULL, NULL, NULL }, // screen + { NULL, NULL, NULL }, // overlay + { darken_modeproc16_0, darken_modeproc16_255, NULL }, // darken + { lighten_modeproc16_0, lighten_modeproc16_255, NULL }, // lighten + { NULL, NULL, NULL }, // colordodge + { NULL, NULL, NULL }, // colorburn + { NULL, NULL, NULL }, // hardlight + { NULL, NULL, NULL }, // softlight + { NULL, NULL, NULL }, // difference + { NULL, NULL, NULL }, // exclusion + { NULL, NULL, NULL }, // multiply + { NULL, NULL, NULL }, // hue + { NULL, NULL, NULL }, // saturation + { NULL, NULL, NULL }, // color + { NULL, NULL, NULL }, // luminosity +}; + +SkXfermodeProc16 SkXfermode::GetProc16(Mode mode, SkColor srcColor) { + SkXfermodeProc16 proc16 = NULL; + if ((unsigned)mode < kModeCount) { + const Proc16Rec& rec = gModeProcs16[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; +} + +SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkXfermode) + SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkProcCoeffXfermode) + SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkClearXfermode) + SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkSrcXfermode) + SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkDstInXfermode) + SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkDstOutXfermode) +#if !SK_ARM_NEON_IS_NONE + SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkNEONProcCoeffXfermode) +#endif +SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END