/*
* 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 "SkFlattenableBuffers.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(SkFlattenableReadBuffer& buffer)
: SkXfermode(buffer) {
fProc = NULL;
if (!buffer.isCrossProcess()) {
fProc = (SkXfermodeProc)buffer.readFunctionPtr();
}
}
void SkProcXfermode::flatten(SkFlattenableWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
if (!buffer.isCrossProcess()) {
buffer.writeFunctionPtr((void*)fProc);
}
}
#ifdef SK_DEVELOPER
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<XferEffect>::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<XferEffect>().mode();
const GrTexture* backgroundTex = drawEffect.castEffect<XferEffect>().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<XferEffect>().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<XferEffect>(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<SkXfermode::Mode>(mode), NULL)));
return CreateEffectRef(gEffect);
}
#endif
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
SkProcCoeffXfermode::SkProcCoeffXfermode(SkFlattenableReadBuffer& 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(SkFlattenableWriteBuffer& 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);
}
#ifdef SK_DEVELOPER
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:
SkClearXfermode(const ProcCoeff& rec) : SkProcCoeffXfermode(rec, kClear_Mode) {}
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_DEVELOPER_TO_STRING()
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkClearXfermode)
private:
SkClearXfermode(SkFlattenableReadBuffer& 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);
}
}
}
}
#ifdef SK_DEVELOPER
void SkClearXfermode::toString(SkString* str) const {
this->INHERITED::toString(str);
}
#endif
///////////////////////////////////////////////////////////////////////////////
class SkSrcXfermode : public SkProcCoeffXfermode {
public:
SkSrcXfermode(const ProcCoeff& rec) : SkProcCoeffXfermode(rec, kSrc_Mode) {}
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_DEVELOPER_TO_STRING()
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkSrcXfermode)
private:
SkSrcXfermode(SkFlattenableReadBuffer& 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));
}
}
}
}
}
#ifdef SK_DEVELOPER
void SkSrcXfermode::toString(SkString* str) const {
this->INHERITED::toString(str);
}
#endif
///////////////////////////////////////////////////////////////////////////////
class SkDstInXfermode : public SkProcCoeffXfermode {
public:
SkDstInXfermode(const ProcCoeff& rec) : SkProcCoeffXfermode(rec, kDstIn_Mode) {}
virtual void xfer32(SkPMColor*, const SkPMColor*, int, const SkAlpha*) const SK_OVERRIDE;
SK_DEVELOPER_TO_STRING()
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDstInXfermode)
private:
SkDstInXfermode(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {}
typedef SkProcCoeffXfermode INHERITED;
};
void SkDstInXfermode::xfer32(SkPMColor* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src, int count,
const SkAlpha* SK_RESTRICT aa) 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);
}
#ifdef SK_DEVELOPER
void SkDstInXfermode::toString(SkString* str) const {
this->INHERITED::toString(str);
}
#endif
///////////////////////////////////////////////////////////////////////////////
class SkDstOutXfermode : public SkProcCoeffXfermode {
public:
SkDstOutXfermode(const ProcCoeff& rec) : SkProcCoeffXfermode(rec, kDstOut_Mode) {}
virtual void xfer32(SkPMColor*, const SkPMColor*, int, const SkAlpha*) const SK_OVERRIDE;
SK_DEVELOPER_TO_STRING()
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDstOutXfermode)
private:
SkDstOutXfermode(SkFlattenableReadBuffer& buffer)
: INHERITED(buffer) {}
typedef SkProcCoeffXfermode INHERITED;
};
void SkDstOutXfermode::xfer32(SkPMColor* SK_RESTRICT dst,
const SkPMColor* SK_RESTRICT src, int count,
const SkAlpha* SK_RESTRICT aa) 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);
}
#ifdef SK_DEVELOPER
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 = SkNEW_ARGS(SkClearXfermode, (rec));
break;
case kSrc_Mode:
xfer = SkNEW_ARGS(SkSrcXfermode, (rec));
break;
case kSrcOver_Mode:
SkASSERT(false); // should not land here
break;
case kDstIn_Mode:
xfer = SkNEW_ARGS(SkDstInXfermode, (rec));
break;
case kDstOut_Mode:
xfer = SkNEW_ARGS(SkDstOutXfermode, (rec));
break;
default:
// no special-case, just rely in the rec and its function-ptrs
xfer = SkNEW_ARGS(SkProcCoeffXfermode, (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