| |
| /* |
| * 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 "SkMathPriv.h" |
| #include "SkOncePtr.h" |
| #include "SkOpts.h" |
| #include "SkReadBuffer.h" |
| #include "SkString.h" |
| #include "SkWriteBuffer.h" |
| |
| #define SkAlphaMulAlpha(a, b) SkMulDiv255Round(a, b) |
| |
| 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::asMode(Mode* mode) const { |
| return false; |
| } |
| |
| bool SkXfermode::asFragmentProcessor(GrFragmentProcessor**, GrProcessorDataManager*, |
| GrTexture*) const { |
| return false; |
| } |
| |
| bool SkXfermode::asXPFactory(GrXPFactory**) const { |
| return false; |
| } |
| |
| |
| #if SK_SUPPORT_GPU |
| #include "effects/GrPorterDuffXferProcessor.h" |
| |
| bool SkXfermode::AsXPFactory(SkXfermode* xfermode, GrXPFactory** xpf) { |
| if (nullptr == xfermode) { |
| if (xpf) { |
| *xpf = GrPorterDuffXPFactory::Create(kSrcOver_Mode); |
| } |
| return true; |
| } else { |
| return xfermode->asXPFactory(xpf); |
| } |
| } |
| #else |
| bool SkXfermode::AsXPFactory(SkXfermode* xfermode, GrXPFactory** xpf) { |
| return false; |
| } |
| #endif |
| |
| 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 (nullptr == 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 (nullptr == 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 (nullptr == 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); |
| } |
| } |
| } |
| } |
| |
| bool SkXfermode::supportsCoverageAsAlpha() const { |
| return false; |
| } |
| |
| bool SkXfermode::isOpaque(SkXfermode::SrcColorOpacity opacityType) const { |
| return false; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkFlattenable* SkProcCoeffXfermode::CreateProc(SkReadBuffer& buffer) { |
| uint32_t mode32 = buffer.read32(); |
| if (!buffer.validate(mode32 < SK_ARRAY_COUNT(gProcCoeffs))) { |
| return nullptr; |
| } |
| return SkXfermode::Create((SkXfermode::Mode)mode32); |
| } |
| |
| void SkProcCoeffXfermode::flatten(SkWriteBuffer& buffer) const { |
| buffer.write32(fMode); |
| } |
| |
| bool SkProcCoeffXfermode::asMode(Mode* mode) const { |
| if (mode) { |
| *mode = fMode; |
| } |
| return true; |
| } |
| |
| bool SkProcCoeffXfermode::supportsCoverageAsAlpha() const { |
| if (CANNOT_USE_COEFF == fSrcCoeff) { |
| return false; |
| } |
| |
| switch (fDstCoeff) { |
| case SkXfermode::kOne_Coeff: |
| case SkXfermode::kISA_Coeff: |
| case SkXfermode::kISC_Coeff: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| bool SkProcCoeffXfermode::isOpaque(SkXfermode::SrcColorOpacity opacityType) const { |
| if (CANNOT_USE_COEFF == fSrcCoeff) { |
| return false; |
| } |
| |
| if (SkXfermode::kDA_Coeff == fSrcCoeff || SkXfermode::kDC_Coeff == fSrcCoeff || |
| SkXfermode::kIDA_Coeff == fSrcCoeff || SkXfermode::kIDC_Coeff == fSrcCoeff) { |
| return false; |
| } |
| |
| switch (fDstCoeff) { |
| case SkXfermode::kZero_Coeff: |
| return true; |
| case SkXfermode::kISA_Coeff: |
| return SkXfermode::kOpaque_SrcColorOpacity == opacityType; |
| case SkXfermode::kSA_Coeff: |
| return SkXfermode::kTransparentBlack_SrcColorOpacity == opacityType || |
| SkXfermode::kTransparentAlpha_SrcColorOpacity == opacityType; |
| case SkXfermode::kSC_Coeff: |
| return SkXfermode::kTransparentBlack_SrcColorOpacity == opacityType; |
| default: |
| return false; |
| } |
| |
| } |
| |
| void SkProcCoeffXfermode::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 (proc) { |
| if (nullptr == 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 SkProcCoeffXfermode::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 (proc) { |
| if (nullptr == 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 SkProcCoeffXfermode::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 (proc) { |
| if (nullptr == 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); |
| } |
| } |
| } |
| } |
| } |
| |
| #if SK_SUPPORT_GPU |
| #include "effects/GrCustomXfermode.h" |
| |
| bool SkProcCoeffXfermode::asFragmentProcessor(GrFragmentProcessor** fp, |
| GrProcessorDataManager* procDataManager, |
| GrTexture* background) const { |
| if (GrCustomXfermode::IsSupportedMode(fMode)) { |
| if (fp) { |
| SkASSERT(procDataManager); |
| *fp = GrCustomXfermode::CreateFP(procDataManager, fMode, background); |
| SkASSERT(*fp); |
| } |
| return true; |
| } |
| return false; |
| } |
| |
| bool SkProcCoeffXfermode::asXPFactory(GrXPFactory** xp) const { |
| if (CANNOT_USE_COEFF != fSrcCoeff) { |
| if (xp) { |
| *xp = GrPorterDuffXPFactory::Create(fMode); |
| SkASSERT(*xp); |
| } |
| return true; |
| } |
| |
| if (GrCustomXfermode::IsSupportedMode(fMode)) { |
| if (xp) { |
| *xp = GrCustomXfermode::CreateXPFactory(fMode); |
| SkASSERT(*xp); |
| } |
| return true; |
| } |
| return false; |
| } |
| #endif |
| |
| 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]; |
| static_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 |
| |
| |
| SK_DECLARE_STATIC_ONCE_PTR(SkXfermode, cached[SkXfermode::kLastMode + 1]); |
| |
| SkXfermode* SkXfermode::Create(Mode mode) { |
| SkASSERT(SK_ARRAY_COUNT(gProcCoeffs) == kModeCount); |
| |
| if ((unsigned)mode >= kModeCount) { |
| // report error |
| return nullptr; |
| } |
| |
| // Skia's "default" mode is srcover. nullptr in SkPaint is interpreted as srcover |
| // so we can just return nullptr from the factory. |
| if (kSrcOver_Mode == mode) { |
| return nullptr; |
| } |
| |
| return SkSafeRef(cached[mode].get([=]{ |
| ProcCoeff rec = gProcCoeffs[mode]; |
| if (auto xfermode = SkOpts::create_xfermode(rec, mode)) { |
| return xfermode; |
| } |
| return (SkXfermode*) new SkProcCoeffXfermode(rec, mode); |
| })); |
| } |
| |
| SkXfermodeProc SkXfermode::GetProc(Mode mode) { |
| SkXfermodeProc proc = nullptr; |
| 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 (nullptr == xfer) { |
| if (mode) { |
| *mode = kSrcOver_Mode; |
| } |
| return true; |
| } |
| return xfer->asMode(mode); |
| } |
| |
| 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; |
| } |
| |
| bool SkXfermode::SupportsCoverageAsAlpha(const SkXfermode* xfer) { |
| // if xfer is nullptr we treat it as srcOver which always supports coverageAsAlpha |
| if (!xfer) { |
| return true; |
| } |
| |
| return xfer->supportsCoverageAsAlpha(); |
| } |
| |
| bool SkXfermode::IsOpaque(const SkXfermode* xfer, SrcColorOpacity opacityType) { |
| // if xfer is nullptr we treat it as srcOver which is opaque if our src is opaque |
| if (!xfer) { |
| return SkXfermode::kOpaque_SrcColorOpacity == opacityType; |
| } |
| |
| return xfer->isOpaque(opacityType); |
| } |
| |
| SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkXfermode) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkProcCoeffXfermode) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END |
