bool SkColorShader::setContext(const SkBitmap& device, const SkPaint& paint,
const SkMatrix& matrix) {
if (!this->INHERITED::setContext(device, paint, matrix)) {
return false;
}
SkColor c;
unsigned a;
if (fInheritColor) {
c = paint.getColor();
a = SkColorGetA(c);
} else {
c = fColor;
a = SkAlphaMul(SkColorGetA(c), SkAlpha255To256(paint.getAlpha()));
}
unsigned r = SkColorGetR(c);
unsigned g = SkColorGetG(c);
unsigned b = SkColorGetB(c);
// we want this before we apply any alpha
fColor16 = SkPack888ToRGB16(r, g, b);
if (a != 255) {
a = SkAlpha255To256(a);
r = SkAlphaMul(r, a);
g = SkAlphaMul(g, a);
b = SkAlphaMul(b, a);
}
fPMColor = SkPackARGB32(a, r, g, b);
return true;
}
void SkTransparentShader::TransparentShaderContext::shadeSpan(int x, int y, SkPMColor span[],
int count) {
unsigned scale = SkAlpha255To256(this->getPaintAlpha());
switch (fDevice->colorType()) {
case kN32_SkColorType:
if (scale == 256) {
SkPMColor* src = fDevice->getAddr32(x, y);
if (src != span) {
memcpy(span, src, count * sizeof(SkPMColor));
}
} else {
const SkPMColor* src = fDevice->getAddr32(x, y);
for (int i = count - 1; i >= 0; --i) {
span[i] = SkAlphaMulQ(src[i], scale);
}
}
break;
case kRGB_565_SkColorType: {
const uint16_t* src = fDevice->getAddr16(x, y);
if (scale == 256) {
for (int i = count - 1; i >= 0; --i) {
span[i] = SkPixel16ToPixel32(src[i]);
}
} else {
unsigned alpha = this->getPaintAlpha();
for (int i = count - 1; i >= 0; --i) {
uint16_t c = src[i];
unsigned r = SkPacked16ToR32(c);
unsigned g = SkPacked16ToG32(c);
unsigned b = SkPacked16ToB32(c);
span[i] = SkPackARGB32( alpha,
SkAlphaMul(r, scale),
SkAlphaMul(g, scale),
SkAlphaMul(b, scale));
}
}
break;
}
case kAlpha_8_SkColorType: {
const uint8_t* src = fDevice->getAddr8(x, y);
if (scale == 256) {
for (int i = count - 1; i >= 0; --i) {
span[i] = SkPackARGB32(src[i], 0, 0, 0);
}
} else {
for (int i = count - 1; i >= 0; --i) {
span[i] = SkPackARGB32(SkAlphaMul(src[i], scale), 0, 0, 0);
}
}
break;
}
default:
SkDEBUGFAIL("colorType not supported as a destination device");
break;
}
}
SkARGB32_Blitter::SkARGB32_Blitter(const SkBitmap& device, const SkPaint& paint)
: INHERITED(device) {
uint32_t color = paint.getColor();
fSrcA = SkColorGetA(color);
unsigned scale = SkAlpha255To256(fSrcA);
fSrcR = SkAlphaMul(SkColorGetR(color), scale);
fSrcG = SkAlphaMul(SkColorGetG(color), scale);
fSrcB = SkAlphaMul(SkColorGetB(color), scale);
fPMColor = SkPackARGB32(fSrcA, fSrcR, fSrcG, fSrcB);
}
SkARGB32_Blitter::SkARGB32_Blitter(const SkBitmap& device, const SkPaint& paint)
: INHERITED(device) {
SkColor color = paint.getColor();
fColor = color;
fSrcA = SkColorGetA(color);
unsigned scale = SkAlpha255To256(fSrcA);
fSrcR = SkAlphaMul(SkColorGetR(color), scale);
fSrcG = SkAlphaMul(SkColorGetG(color), scale);
fSrcB = SkAlphaMul(SkColorGetB(color), scale);
fPMColor = SkPackARGB32(fSrcA, fSrcR, fSrcG, fSrcB);
fColor32Proc = SkBlitRow::ColorProcFactory();
fColorRect32Proc = SkBlitRow::ColorRectProcFactory();
}
static void reverseRedAndBlue(const SkBitmap& bm) {
SkASSERT(bm.config() == SkBitmap::kARGB_8888_Config);
uint8_t* p = (uint8_t*)bm.getPixels();
uint8_t* stop = p + bm.getSize();
while (p < stop) {
// swap red/blue (to go from ARGB(int) to RGBA(memory) and premultiply
unsigned scale = SkAlpha255To256(p[3]);
unsigned r = p[2];
unsigned b = p[0];
p[0] = SkAlphaMul(r, scale);
p[1] = SkAlphaMul(p[1], scale);
p[2] = SkAlphaMul(b, scale);
p += 4;
}
}
SkPMColor SkPreMultiplyARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b) {
if (a != 255) {
#if 0
unsigned scale = SkAlpha255To256(a);
r = SkAlphaMul(r, scale);
g = SkAlphaMul(g, scale);
b = SkAlphaMul(b, scale);
#else
r = SkMulDiv255Round(r, a);
g = SkMulDiv255Round(g, a);
b = SkMulDiv255Round(b, a);
#endif
}
return SkPackARGB32(a, r, g, b);
}
SkColorShader::ColorShaderContext::ColorShaderContext(const SkColorShader& shader,
const ContextRec& rec)
: INHERITED(shader, rec)
{
SkColor color = shader.fColor;
unsigned a = SkAlphaMul(SkColorGetA(color), SkAlpha255To256(rec.fPaint->getAlpha()));
unsigned r = SkColorGetR(color);
unsigned g = SkColorGetG(color);
unsigned b = SkColorGetB(color);
// we want this before we apply any alpha
fColor16 = SkPack888ToRGB16(r, g, b);
if (a != 255) {
r = SkMulDiv255Round(r, a);
g = SkMulDiv255Round(g, a);
b = SkMulDiv255Round(b, a);
}
fPMColor = SkPackARGB32(a, r, g, b);
fFlags = kConstInY32_Flag;
if (255 == a) {
fFlags |= kOpaqueAlpha_Flag;
if (rec.fPaint->isDither() == false) {
fFlags |= kHasSpan16_Flag;
}
}
}
SkColor SkHSVToColor(U8CPU a, const SkScalar hsv[3]) {
SkASSERT(hsv);
U8CPU s = SkUnitScalarClampToByte(hsv[1]);
U8CPU v = SkUnitScalarClampToByte(hsv[2]);
if (0 == s) { // shade of gray
return SkColorSetARGB(a, v, v, v);
}
SkFixed hx = (hsv[0] < 0 || hsv[0] >= SkIntToScalar(360)) ? 0 : SkScalarToFixed(hsv[0]/60);
SkFixed f = hx & 0xFFFF;
unsigned v_scale = SkAlpha255To256(v);
unsigned p = SkAlphaMul(255 - s, v_scale);
unsigned q = SkAlphaMul(255 - (s * f >> 16), v_scale);
unsigned t = SkAlphaMul(255 - (s * (SK_Fixed1 - f) >> 16), v_scale);
unsigned r, g, b;
SkASSERT((unsigned)(hx >> 16) < 6);
switch (hx >> 16) {
case 0: r = v; g = t; b = p; break;
case 1: r = q; g = v; b = p; break;
case 2: r = p; g = v; b = t; break;
case 3: r = p; g = q; b = v; break;
case 4: r = t; g = p; b = v; break;
default: r = v; g = p; b = q; break;
}
return SkColorSetARGB(a, r, g, b);
}
void SkBaseDevice::drawImageLattice(const SkImage* image,
const SkCanvas::Lattice& lattice, const SkRect& dst,
const SkPaint& paint) {
SkLatticeIter iter(lattice, dst);
SkRect srcR, dstR;
SkColor c;
bool isFixedColor = false;
const SkImageInfo info = SkImageInfo::Make(1, 1, kBGRA_8888_SkColorType, kUnpremul_SkAlphaType);
while (iter.next(&srcR, &dstR, &isFixedColor, &c)) {
if (isFixedColor || (srcR.width() <= 1.0f && srcR.height() <= 1.0f &&
image->readPixels(info, &c, 4, srcR.fLeft, srcR.fTop))) {
// Fast draw with drawRect, if this is a patch containing a single color
// or if this is a patch containing a single pixel.
if (0 != c || !paint.isSrcOver()) {
SkPaint paintCopy(paint);
int alpha = SkAlphaMul(SkColorGetA(c), SkAlpha255To256(paint.getAlpha()));
paintCopy.setColor(SkColorSetA(c, alpha));
this->drawRect(dstR, paintCopy);
}
} else {
this->drawImageRect(image, &srcR, dstR, paint, SkCanvas::kStrict_SrcRectConstraint);
}
}
}
static void clamp_with_orig(uint8_t dst[], int dstRowBytes,
const uint8_t src[], int srcRowBytes,
int sw, int sh,
SkBlurMask::Style style) {
int x;
while (--sh >= 0) {
switch (style) {
case SkBlurMask::kSolid_Style:
for (x = sw - 1; x >= 0; --x) {
int s = *src;
int d = *dst;
*dst = SkToU8(s + d - SkMulDiv255Round(s, d));
dst += 1;
src += 1;
}
break;
case SkBlurMask::kOuter_Style:
for (x = sw - 1; x >= 0; --x) {
if (*src) {
*dst = SkToU8(SkAlphaMul(*dst, SkAlpha255To256(255 - *src)));
}
dst += 1;
src += 1;
}
break;
default:
SkDEBUGFAIL("Unexpected blur style here");
break;
}
dst += dstRowBytes - sw;
src += srcRowBytes - sw;
}
}
SkColorShader::ColorShaderContext::ColorShaderContext(const SkColorShader& shader,
const ContextRec& rec)
: INHERITED(shader, rec)
{
SkColor color = shader.fColor;
unsigned a = SkAlphaMul(SkColorGetA(color), SkAlpha255To256(rec.fPaint->getAlpha()));
unsigned r = SkColorGetR(color);
unsigned g = SkColorGetG(color);
unsigned b = SkColorGetB(color);
if (a != 255) {
r = SkMulDiv255Round(r, a);
g = SkMulDiv255Round(g, a);
b = SkMulDiv255Round(b, a);
}
fPMColor = SkPackARGB32(a, r, g, b);
SkColor4f c4 = SkColor4f::FromColor(shader.fColor);
c4.fA *= rec.fPaint->getAlpha() / 255.0f;
fPM4f = c4.premul();
fFlags = kConstInY32_Flag;
if (255 == a) {
fFlags |= kOpaqueAlpha_Flag;
}
}
SkARGB32_Blitter::SkARGB32_Blitter(const SkBitmap& device, const SkPaint& paint)
: INHERITED(device) {
SkColor color = paint.getColor();
fColor = color;
fSrcA = SkColorGetA(color);
unsigned scale = SkAlpha255To256(fSrcA);
fSrcR = SkAlphaMul(SkColorGetR(color), scale);
fSrcG = SkAlphaMul(SkColorGetG(color), scale);
fSrcB = SkAlphaMul(SkColorGetB(color), scale);
fPMColor = SkPackARGB32(fSrcA, fSrcR, fSrcG, fSrcB);
fColor32Proc = SkBlitRow::ColorProcFactory();
// init the pro for blitmask
fBlitMaskProc = SkBlitMask::Factory(SkBitmap::kARGB_8888_Config, color);
}
virtual void filterSpan(const SkPMColor shader[], int count,
SkPMColor result[]) {
unsigned scaleR = SkAlpha255To256(SkColorGetR(fMul));
unsigned scaleG = SkAlpha255To256(SkColorGetG(fMul));
unsigned scaleB = SkAlpha255To256(SkColorGetB(fMul));
for (int i = 0; i < count; i++) {
SkPMColor c = shader[i];
if (c) {
unsigned a = SkGetPackedA32(c);
unsigned r = SkAlphaMul(SkGetPackedR32(c), scaleR);
unsigned g = SkAlphaMul(SkGetPackedG32(c), scaleG);
unsigned b = SkAlphaMul(SkGetPackedB32(c), scaleB);
c = SkPackARGB32(a, r, g, b);
}
result[i] = c;
}
}
virtual void filterSpan(const SkPMColor shader[], int count,
SkPMColor result[]) {
unsigned addR = SkColorGetR(fAdd);
unsigned addG = SkColorGetG(fAdd);
unsigned addB = SkColorGetB(fAdd);
for (int i = 0; i < count; i++) {
SkPMColor c = shader[i];
if (c) {
unsigned a = SkGetPackedA32(c);
unsigned scaleA = SkAlpha255To256(a);
unsigned r = pin(SkGetPackedR32(c) + SkAlphaMul(addR, scaleA), a);
unsigned g = pin(SkGetPackedG32(c) + SkAlphaMul(addG, scaleA), a);
unsigned b = pin(SkGetPackedB32(c) + SkAlphaMul(addB, scaleA), a);
c = SkPackARGB32(a, r, g, b);
}
result[i] = c;
}
}
SkColor PlatformContextSkia::State::applyAlpha(SkColor c) const
{
int s = roundf(m_alpha * 256);
if (s >= 256)
return c;
if (s < 0)
return 0;
int a = SkAlphaMul(SkColorGetA(c), s);
return (c & 0x00FFFFFF) | (a << 24);
}
SkColor PlatformGraphicsContext::State::applyAlpha(SkColor c) const
{
int s = RoundToInt(alpha * 256);
if (s >= 256)
return c;
if (s < 0)
return 0;
int a = SkAlphaMul(SkColorGetA(c), s);
return (c & 0x00FFFFFF) | (a << 24);
}
static inline void D16_S32A_Blend_Pixel_helper(uint16_t* dst, SkPMColor sc,
unsigned src_scale) {
uint16_t dc = *dst;
unsigned sa = SkGetPackedA32(sc);
unsigned dr, dg, db;
if (255 == sa) {
dr = SkAlphaBlend(SkPacked32ToR16(sc), SkGetPackedR16(dc), src_scale);
dg = SkAlphaBlend(SkPacked32ToG16(sc), SkGetPackedG16(dc), src_scale);
db = SkAlphaBlend(SkPacked32ToB16(sc), SkGetPackedB16(dc), src_scale);
} else {
unsigned dst_scale = 255 - SkAlphaMul(sa, src_scale);
dr = (SkPacked32ToR16(sc) * src_scale + SkGetPackedR16(dc) * dst_scale) >> 8;
dg = (SkPacked32ToG16(sc) * src_scale + SkGetPackedG16(dc) * dst_scale) >> 8;
db = (SkPacked32ToB16(sc) * src_scale + SkGetPackedB16(dc) * dst_scale) >> 8;
}
*dst = SkPackRGB16(dr, dg, db);
}
static void merge_src_with_blur(uint8_t dst[], int dstRB,
const uint8_t src[], int srcRB,
const uint8_t blur[], int blurRB,
int sw, int sh) {
dstRB -= sw;
srcRB -= sw;
blurRB -= sw;
while (--sh >= 0) {
for (int x = sw - 1; x >= 0; --x) {
*dst = SkToU8(SkAlphaMul(*blur, SkAlpha255To256(*src)));
dst += 1;
src += 1;
blur += 1;
}
dst += dstRB;
src += srcRB;
blur += blurRB;
}
}
bool SkColorShader::setContext(const SkBitmap& device, const SkPaint& paint,
const SkMatrix& matrix) {
if (!this->INHERITED::setContext(device, paint, matrix)) {
return false;
}
SkColor c;
unsigned a;
if (fInheritColor) {
c = paint.getColor();
a = SkColorGetA(c);
} else {
c = fColor;
a = SkAlphaMul(SkColorGetA(c), SkAlpha255To256(paint.getAlpha()));
}
unsigned r = SkColorGetR(c);
unsigned g = SkColorGetG(c);
unsigned b = SkColorGetB(c);
// we want this before we apply any alpha
fColor16 = SkPack888ToRGB16(r, g, b);
if (a != 255) {
r = SkMulDiv255Round(r, a);
g = SkMulDiv255Round(g, a);
b = SkMulDiv255Round(b, a);
}
fPMColor = SkPackARGB32(a, r, g, b);
fFlags = kConstInY32_Flag;
if (255 == a) {
fFlags |= kOpaqueAlpha_Flag;
if (paint.isDither() == false) {
fFlags |= kHasSpan16_Flag;
}
}
return true;
}
void SkAvoidXfermode::xfer32(SkPMColor dst[], const SkPMColor src[], int count,
const SkAlpha aa[])
{
unsigned opR = SkColorGetR(fOpColor);
unsigned opG = SkColorGetG(fOpColor);
unsigned opB = SkColorGetB(fOpColor);
uint32_t mul = fDistMul;
uint32_t sub = (fDistMul - (1 << 14)) << 8;
int MAX, mask;
if (kTargetColor_Mode == fMode) {
mask = -1;
MAX = 255;
} else {
mask = 0;
MAX = 0;
}
for (int i = 0; i < count; i++) {
int d = color_dist32(dst[i], opR, opG, opB);
// now reverse d if we need to
d = MAX + (d ^ mask) - mask;
SkASSERT((unsigned)d <= 255);
d = Accurate255To256(d);
d = scale_dist_14(d, mul, sub);
SkASSERT(d <= 256);
if (d > 0) {
if (NULL != aa) {
d = SkAlphaMul(d, Accurate255To256(*aa++));
if (0 == d) {
continue;
}
}
dst[i] = SkFourByteInterp(src[i], dst[i], d);
}
}
}
void SkAvoidXfermode::xfer4444(uint16_t dst[], const SkPMColor src[], int count,
const SkAlpha aa[])
{
unsigned opR = SkColorGetR(fOpColor) >> 4;
unsigned opG = SkColorGetG(fOpColor) >> 4;
unsigned opB = SkColorGetB(fOpColor) >> 4;
uint32_t mul = fDistMul;
uint32_t sub = (fDistMul - (1 << 14)) << 4;
int MAX, mask;
if (kTargetColor_Mode == fMode) {
mask = -1;
MAX = 15;
} else {
mask = 0;
MAX = 0;
}
for (int i = 0; i < count; i++) {
int d = color_dist4444(dst[i], opR, opG, opB);
// now reverse d if we need to
d = MAX + (d ^ mask) - mask;
SkASSERT((unsigned)d <= 15);
// convert from 0..15 to 0..16
d += d >> 3;
d = scale_dist_14(d, mul, sub);
SkASSERT(d <= 16);
if (d > 0) {
if (NULL != aa) {
d = SkAlphaMul(d, Accurate255To256(*aa++));
if (0 == d) {
continue;
}
}
dst[i] = SkBlend4444(SkPixel32ToPixel4444(src[i]), dst[i], d);
}
}
}
void SkAvoidXfermode::xfer16(uint16_t dst[], const SkPMColor src[], int count,
const SkAlpha aa[]) const {
unsigned opR = SkColorGetR(fOpColor) >> (8 - SK_R16_BITS);
unsigned opG = SkColorGetG(fOpColor) >> (8 - SK_G16_BITS);
unsigned opB = SkColorGetB(fOpColor) >> (8 - SK_R16_BITS);
uint32_t mul = fDistMul;
uint32_t sub = (fDistMul - (1 << 14)) << SK_R16_BITS;
int MAX, mask;
if (kTargetColor_Mode == fMode) {
mask = -1;
MAX = 31;
} else {
mask = 0;
MAX = 0;
}
for (int i = 0; i < count; i++) {
int d = color_dist16(dst[i], opR, opG, opB);
// now reverse d if we need to
d = MAX + (d ^ mask) - mask;
SkASSERT((unsigned)d <= 31);
// convert from 0..31 to 0..32
d += d >> 4;
d = scale_dist_14(d, mul, sub);
SkASSERT(d <= 32);
if (d > 0) {
if (aa) {
d = SkAlphaMul(d, Accurate255To256(*aa++));
if (0 == d) {
continue;
}
}
dst[i] = SkBlend3216(src[i], dst[i], d);
}
}
}
// our std SkAlpha255To256
static int test_srcover0(unsigned dst, unsigned alpha) {
return alpha + SkAlphaMul(dst, SkAlpha255To256(255 - alpha));
}
void SkTransparentShader::shadeSpan(int x, int y, SkPMColor span[], int count) {
unsigned scale = SkAlpha255To256(fAlpha);
switch (fDevice->getConfig()) {
case SkBitmap::kARGB_8888_Config:
if (scale == 256) {
SkPMColor* src = fDevice->getAddr32(x, y);
if (src != span) {
memcpy(span, src, count * sizeof(SkPMColor));
}
} else {
const SkPMColor* src = fDevice->getAddr32(x, y);
for (int i = count - 1; i >= 0; --i) {
span[i] = SkAlphaMulQ(src[i], scale);
}
}
break;
case SkBitmap::kRGB_565_Config: {
const uint16_t* src = fDevice->getAddr16(x, y);
if (scale == 256) {
for (int i = count - 1; i >= 0; --i) {
span[i] = SkPixel16ToPixel32(src[i]);
}
} else {
unsigned alpha = fAlpha;
for (int i = count - 1; i >= 0; --i) {
uint16_t c = src[i];
unsigned r = SkPacked16ToR32(c);
unsigned g = SkPacked16ToG32(c);
unsigned b = SkPacked16ToB32(c);
span[i] = SkPackARGB32( alpha,
SkAlphaMul(r, scale),
SkAlphaMul(g, scale),
SkAlphaMul(b, scale));
}
}
break;
}
case SkBitmap::kARGB_4444_Config: {
const uint16_t* src = fDevice->getAddr16(x, y);
if (scale == 256) {
for (int i = count - 1; i >= 0; --i) {
span[i] = SkPixel4444ToPixel32(src[i]);
}
} else {
unsigned scale16 = scale >> 4;
for (int i = count - 1; i >= 0; --i) {
uint32_t c = SkExpand_4444(src[i]) * scale16;
span[i] = SkCompact_8888(c);
}
}
break;
}
case SkBitmap::kIndex8_Config:
SkDEBUGFAIL("index8 not supported as a destination device");
break;
case SkBitmap::kA8_Config: {
const uint8_t* src = fDevice->getAddr8(x, y);
if (scale == 256) {
for (int i = count - 1; i >= 0; --i) {
span[i] = SkPackARGB32(src[i], 0, 0, 0);
}
} else {
for (int i = count - 1; i >= 0; --i) {
span[i] = SkPackARGB32(SkAlphaMul(src[i], scale), 0, 0, 0);
}
}
break;
}
case SkBitmap::kA1_Config:
SkDEBUGFAIL("kA1_Config umimplemented at this time");
break;
default: // to avoid warnings
break;
}
}
// faster hack +1
static int test_srcover1(unsigned dst, unsigned alpha) {
return alpha + SkAlphaMul(dst, 256 - alpha);
}