static SkPMColor mult_modeproc(SkPMColor src, SkPMColor dst) {
int a = SkAlphaMulAlpha(SkGetPackedA32(src), SkGetPackedA32(dst));
int r = SkAlphaMulAlpha(SkGetPackedR32(src), SkGetPackedR32(dst));
int g = SkAlphaMulAlpha(SkGetPackedG32(src), SkGetPackedG32(dst));
int b = SkAlphaMulAlpha(SkGetPackedB32(src), SkGetPackedB32(dst));
return SkPackARGB32(a, r, g, b);
}
DEF_TEST(LumaColorFilter, reporter) {
SkPMColor in, out;
auto lf(SkLumaColorFilter::Make());
// Applying luma to white produces black with the same transparency.
for (unsigned i = 0; i < 256; ++i) {
in = SkPackARGB32(i, i, i, i);
lf->filterSpan(&in, 1, &out);
REPORTER_ASSERT(reporter, SkGetPackedA32(out) == i);
REPORTER_ASSERT(reporter, SkGetPackedR32(out) == 0);
REPORTER_ASSERT(reporter, SkGetPackedG32(out) == 0);
REPORTER_ASSERT(reporter, SkGetPackedB32(out) == 0);
}
// Applying luma to black yields transparent black (luminance(black) == 0)
for (unsigned i = 0; i < 256; ++i) {
in = SkPackARGB32(i, 0, 0, 0);
lf->filterSpan(&in, 1, &out);
REPORTER_ASSERT(reporter, out == SK_ColorTRANSPARENT);
}
// For general colors, a luma filter generates black with an attenuated alpha channel.
for (unsigned i = 1; i < 256; ++i) {
in = SkPackARGB32(i, i, i / 2, i / 3);
lf->filterSpan(&in, 1, &out);
REPORTER_ASSERT(reporter, out != in);
REPORTER_ASSERT(reporter, SkGetPackedA32(out) <= i);
REPORTER_ASSERT(reporter, SkGetPackedR32(out) == 0);
REPORTER_ASSERT(reporter, SkGetPackedG32(out) == 0);
REPORTER_ASSERT(reporter, SkGetPackedB32(out) == 0);
}
}
// 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);
}
static SkPMColor screen_modeproc(SkPMColor src, SkPMColor dst) {
int a = screen_byte(SkGetPackedA32(src), SkGetPackedA32(dst));
int r = screen_byte(SkGetPackedR32(src), SkGetPackedR32(dst));
int g = screen_byte(SkGetPackedG32(src), SkGetPackedG32(dst));
int b = screen_byte(SkGetPackedB32(src), SkGetPackedB32(dst));
return SkPackARGB32(a, r, g, b);
}
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);
}
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);
}
static SkPMColor SkFourByteInterp(SkPMColor src, SkPMColor dst, unsigned scale)
{
unsigned a = SkAlphaBlend(SkGetPackedA32(src), SkGetPackedA32(dst), scale);
unsigned r = SkAlphaBlend(SkGetPackedR32(src), SkGetPackedR32(dst), scale);
unsigned g = SkAlphaBlend(SkGetPackedG32(src), SkGetPackedG32(dst), scale);
unsigned b = SkAlphaBlend(SkGetPackedB32(src), SkGetPackedB32(dst), scale);
return SkPackARGB32(a, r, g, b);
}
static void boxBlur(const SkPMColor* src, int srcStride, SkPMColor* dst, int kernelSize,
int leftOffset, int rightOffset, int width, int height)
{
int rightBorder = SkMin32(rightOffset + 1, width);
int srcStrideX = srcDirection == kX ? 1 : srcStride;
int dstStrideX = dstDirection == kX ? 1 : height;
int srcStrideY = srcDirection == kX ? srcStride : 1;
int dstStrideY = dstDirection == kX ? width : 1;
uint32_t scale = (1 << 24) / kernelSize;
uint32_t half = 1 << 23;
for (int y = 0; y < height; ++y) {
int sumA = 0, sumR = 0, sumG = 0, sumB = 0;
const SkPMColor* p = src;
for (int i = 0; i < rightBorder; ++i) {
sumA += SkGetPackedA32(*p);
sumR += SkGetPackedR32(*p);
sumG += SkGetPackedG32(*p);
sumB += SkGetPackedB32(*p);
p += srcStrideX;
}
const SkPMColor* sptr = src;
SkColor* dptr = dst;
for (int x = 0; x < width; ++x) {
*dptr = SkPackARGB32((sumA * scale + half) >> 24,
(sumR * scale + half) >> 24,
(sumG * scale + half) >> 24,
(sumB * scale + half) >> 24);
if (x >= leftOffset) {
SkColor l = *(sptr - leftOffset * srcStrideX);
sumA -= SkGetPackedA32(l);
sumR -= SkGetPackedR32(l);
sumG -= SkGetPackedG32(l);
sumB -= SkGetPackedB32(l);
}
if (x + rightOffset + 1 < width) {
SkColor r = *(sptr + (rightOffset + 1) * srcStrideX);
sumA += SkGetPackedA32(r);
sumR += SkGetPackedR32(r);
sumG += SkGetPackedG32(r);
sumB += SkGetPackedB32(r);
}
sptr += srcStrideX;
if (srcDirection == kY) {
SK_PREFETCH(sptr + (rightOffset + 1) * srcStrideX);
}
dptr += dstStrideX;
}
src += srcStrideY;
dst += dstStrideY;
}
}
// 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)));
}
inline SkPMColor cubicBlend(const SkScalar c[16], SkScalar t, SkPMColor c0, SkPMColor c1, SkPMColor c2, SkPMColor c3) {
SkScalar t2 = t * t, t3 = t2 * t;
SkScalar cc[4];
// FIXME: For the fractx case, this should be refactored out of this function.
cc[0] = c[0] + SkScalarMul(c[1], t) + SkScalarMul(c[2], t2) + SkScalarMul(c[3], t3);
cc[1] = c[4] + SkScalarMul(c[5], t) + SkScalarMul(c[6], t2) + SkScalarMul(c[7], t3);
cc[2] = c[8] + SkScalarMul(c[9], t) + SkScalarMul(c[10], t2) + SkScalarMul(c[11], t3);
cc[3] = c[12] + SkScalarMul(c[13], t) + SkScalarMul(c[14], t2) + SkScalarMul(c[15], t3);
SkScalar a = SkScalarMul(cc[0], SkGetPackedA32(c0)) + SkScalarMul(cc[1], SkGetPackedA32(c1)) + SkScalarMul(cc[2], SkGetPackedA32(c2)) + SkScalarMul(cc[3], SkGetPackedA32(c3));
SkScalar r = SkScalarMul(cc[0], SkGetPackedR32(c0)) + SkScalarMul(cc[1], SkGetPackedR32(c1)) + SkScalarMul(cc[2], SkGetPackedR32(c2)) + SkScalarMul(cc[3], SkGetPackedR32(c3));
SkScalar g = SkScalarMul(cc[0], SkGetPackedG32(c0)) + SkScalarMul(cc[1], SkGetPackedG32(c1)) + SkScalarMul(cc[2], SkGetPackedG32(c2)) + SkScalarMul(cc[3], SkGetPackedG32(c3));
SkScalar b = SkScalarMul(cc[0], SkGetPackedB32(c0)) + SkScalarMul(cc[1], SkGetPackedB32(c1)) + SkScalarMul(cc[2], SkGetPackedB32(c2)) + SkScalarMul(cc[3], SkGetPackedB32(c3));
return SkPackARGB32(SkScalarRoundToInt(SkScalarClampMax(a, 255)), SkScalarRoundToInt(SkScalarClampMax(r, 255)), SkScalarRoundToInt(SkScalarClampMax(g, 255)), SkScalarRoundToInt(SkScalarClampMax(b, 255)));
}
static SkStream* extract_argb8888_data(const SkBitmap& bitmap,
const SkIRect& srcRect,
bool extractAlpha,
bool* isOpaque,
bool* isTransparent) {
size_t streamSize = extractAlpha ? srcRect.width() * srcRect.height()
: get_uncompressed_size(bitmap, srcRect);
SkStream* stream = SkNEW_ARGS(SkMemoryStream, (streamSize));
uint8_t* dst = (uint8_t*)stream->getMemoryBase();
const SkUnPreMultiply::Scale* scaleTable = SkUnPreMultiply::GetScaleTable();
for (int y = srcRect.fTop; y < srcRect.fBottom; y++) {
uint32_t* src = bitmap.getAddr32(0, y);
for (int x = srcRect.fLeft; x < srcRect.fRight; x++) {
SkPMColor c = src[x];
U8CPU alpha = SkGetPackedA32(c);
if (extractAlpha) {
*isOpaque &= alpha == SK_AlphaOPAQUE;
*isTransparent &= alpha == SK_AlphaTRANSPARENT;
*dst++ = alpha;
} else {
if (SK_AlphaTRANSPARENT == alpha) {
// It is necessary to average the color component of
// transparent pixels with their surrounding neighbors
// since the PDF renderer may separately re-sample the
// alpha and color channels when the image is not
// displayed at its native resolution. Since an alpha of
// zero gives no information about the color component,
// the pathological case is a white image with sharp
// transparency bounds - the color channel goes to black,
// and the should-be-transparent pixels are rendered
// as grey because of the separate soft mask and color
// resizing.
c = get_argb8888_neighbor_avg_color(bitmap, x, y);
*dst++ = SkGetPackedR32(c);
*dst++ = SkGetPackedG32(c);
*dst++ = SkGetPackedB32(c);
} else {
SkUnPreMultiply::Scale s = scaleTable[alpha];
*dst++ = SkUnPreMultiply::ApplyScale(s, SkGetPackedR32(c));
*dst++ = SkUnPreMultiply::ApplyScale(s, SkGetPackedG32(c));
*dst++ = SkUnPreMultiply::ApplyScale(s, SkGetPackedB32(c));
}
}
}
}
SkASSERT(dst == streamSize + (uint8_t*)stream->getMemoryBase());
return stream;
}
static uint8_t compute_666_index(SkPMColor c) {
int r = SkGetPackedR32(c);
int g = SkGetPackedG32(c);
int b = SkGetPackedB32(c);
return conv_byte_to_6(r) * 36 + conv_byte_to_6(g) * 6 + conv_byte_to_6(b);
}
static SkStream* extract_argb8888_data(const SkBitmap& bitmap,
const SkIRect& srcRect,
bool extractAlpha,
bool* isOpaque,
bool* isTransparent) {
SkStream* stream;
if (extractAlpha) {
stream = SkNEW_ARGS(SkMemoryStream,
(srcRect.width() * srcRect.height()));
} else {
stream = SkNEW_ARGS(SkMemoryStream,
(get_uncompressed_size(bitmap, srcRect)));
}
uint8_t* dst = (uint8_t*)stream->getMemoryBase();
for (int y = srcRect.fTop; y < srcRect.fBottom; y++) {
uint32_t* src = bitmap.getAddr32(0, y);
for (int x = srcRect.fLeft; x < srcRect.fRight; x++) {
if (extractAlpha) {
dst[0] = SkGetPackedA32(src[x]);
*isOpaque &= dst[0] == SK_AlphaOPAQUE;
*isTransparent &= dst[0] == SK_AlphaTRANSPARENT;
dst++;
} else {
dst[0] = SkGetPackedR32(src[x]);
dst[1] = SkGetPackedG32(src[x]);
dst[2] = SkGetPackedB32(src[x]);
dst += 3;
}
}
}
return stream;
}
static uint8_t compute666Index(SkPMColor c) {
int r = SkGetPackedR32(c);
int g = SkGetPackedG32(c);
int b = SkGetPackedB32(c);
return convByteTo6(r) * 36 + convByteTo6(g) * 6 + convByteTo6(b);
}
static void pre_dither(const SkBitmap& bm) {
SkAutoLockPixels alp(bm);
for (int y = 0; y < bm.height(); y++) {
DITHER_4444_SCAN(y);
SkPMColor* p = bm.getAddr32(0, y);
for (int x = 0; x < bm.width(); x++) {
SkPMColor c = *p;
unsigned a = SkGetPackedA32(c);
unsigned r = SkGetPackedR32(c);
unsigned g = SkGetPackedG32(c);
unsigned b = SkGetPackedB32(c);
unsigned d = DITHER_VALUE(x);
a = SkDITHER_A32To4444(a, d);
r = SkDITHER_R32To4444(r, d);
g = SkDITHER_G32To4444(g, d);
b = SkDITHER_B32To4444(b, d);
a = SkA4444ToA32(a);
r = SkR4444ToR32(r);
g = SkG4444ToG32(g);
b = SkB4444ToB32(b);
*p++ = SkPackARGB32(a, r, g, b);
}
}
}
void SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) {
for (int y = rect.fTop; y < rect.fBottom; ++y) {
SkPMColor* dptr = result->getAddr32(rect.fLeft, y);
for (int x = rect.fLeft; x < rect.fRight; ++x) {
SkScalar sumA = 0, sumR = 0, sumG = 0, sumB = 0;
for (int cy = 0; cy < fKernelSize.fHeight; cy++) {
for (int cx = 0; cx < fKernelSize.fWidth; cx++) {
SkPMColor s = PixelFetcher::fetch(src, x + cx - fTarget.fX, y + cy - fTarget.fY);
SkScalar k = fKernel[cy * fKernelSize.fWidth + cx];
if (convolveAlpha) {
sumA += SkScalarMul(SkIntToScalar(SkGetPackedA32(s)), k);
}
sumR += SkScalarMul(SkIntToScalar(SkGetPackedR32(s)), k);
sumG += SkScalarMul(SkIntToScalar(SkGetPackedG32(s)), k);
sumB += SkScalarMul(SkIntToScalar(SkGetPackedB32(s)), k);
}
}
int a = convolveAlpha
? SkClampMax(SkScalarFloorToInt(SkScalarMul(sumA, fGain) + fBias), 255)
: 255;
int r = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumR, fGain) + fBias), a);
int g = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumG, fGain) + fBias), a);
int b = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumB, fGain) + fBias), a);
if (!convolveAlpha) {
a = SkGetPackedA32(PixelFetcher::fetch(src, x, y));
*dptr++ = SkPreMultiplyARGB(a, r, g, b);
} else {
*dptr++ = SkPackARGB32(a, r, g, b);
}
}
}
}
static bool check_4x4_pixel(SkPMColor color, unsigned x, unsigned y) {
SkASSERT(x < 4 && y < 4);
return 0xFF == SkGetPackedA32(color) &&
x == SkGetPackedR32(color) &&
y == SkGetPackedG32(color) &&
0x80 == SkGetPackedB32(color);
}
// Look at each pixel in bm, and if its color appears in colors[], find the
// corresponding value in refs[] and append that ref into array, skipping
// duplicates of the same value.
static void gather_from_colors(const SkBitmap& bm, SkPixelRef* const refs[],
int count, SkTDArray<SkPixelRef*>* array) {
// Since we only want to return unique values in array, when we scan we just
// set a bit for each index'd color found. In practice we only have a few
// distinct colors, so we just use an int's bits as our array. Hence the
// assert that count <= number-of-bits-in-our-int.
SkASSERT((unsigned)count <= 32);
uint32_t bitarray = 0;
SkAutoLockPixels alp(bm);
for (int y = 0; y < bm.height(); ++y) {
for (int x = 0; x < bm.width(); ++x) {
SkPMColor pmc = *bm.getAddr32(x, y);
// the only good case where the color is not found would be if
// the color is transparent, meaning no bitmap was drawn in that
// pixel.
if (pmc) {
uint32_t index = SkGetPackedR32(pmc);
SkASSERT(SkGetPackedG32(pmc) == index);
SkASSERT(SkGetPackedB32(pmc) == index);
SkASSERT(static_cast<int>(index) < count);
bitarray |= 1 << index;
}
}
}
for (int i = 0; i < count; ++i) {
if (bitarray & (1 << i)) {
*array->append() = refs[i];
}
}
}
void TransparencyWin::compositeTextComposite()
{
if (!m_validLayer)
return;
const SkBitmap& bitmap = m_layerBuffer->context()->layerBitmap(GraphicsContext::ReadWrite);
SkColor textColor = m_textCompositeColor.rgb();
for (int y = 0; y < m_layerSize.height(); y++) {
uint32_t* row = bitmap.getAddr32(0, y);
for (int x = 0; x < m_layerSize.width(); x++) {
// The alpha is the average of the R, G, and B channels.
int alpha = (SkGetPackedR32(row[x]) + SkGetPackedG32(row[x]) + SkGetPackedB32(row[x])) / 3;
// Apply that alpha to the text color and write the result.
row[x] = SkAlphaMulQ(textColor, SkAlpha255To256(255 - alpha));
}
}
// Now the layer has text with the proper color and opacity.
m_destContext->save();
// We want to use Untransformed space (see above)
SkMatrix identity;
identity.reset();
m_destContext->setMatrix(identity);
SkRect destRect = { m_transformedSourceRect.x(), m_transformedSourceRect.y(), m_transformedSourceRect.maxX(), m_transformedSourceRect.maxY() };
// Note that we need to specify the source layer subset, since the bitmap
// may have been cached and it could be larger than what we're using.
SkIRect sourceRect = { 0, 0, m_layerSize.width(), m_layerSize.height() };
m_destContext->drawBitmapRect(bitmap, &sourceRect, destRect, 0);
m_destContext->restore();
}
static void erode(const SkPMColor* src, SkPMColor* dst,
int radius, int width, int height,
int srcStrideX, int srcStrideY,
int dstStrideX, int dstStrideY)
{
radius = SkMin32(radius, width - 1);
const SkPMColor* upperSrc = src + radius * srcStrideX;
for (int x = 0; x < width; ++x) {
const SkPMColor* lp = src;
const SkPMColor* up = upperSrc;
SkPMColor* dptr = dst;
for (int y = 0; y < height; ++y) {
int minB = 255, minG = 255, minR = 255, minA = 255;
for (const SkPMColor* p = lp; p <= up; p += srcStrideX) {
int b = SkGetPackedB32(*p);
int g = SkGetPackedG32(*p);
int r = SkGetPackedR32(*p);
int a = SkGetPackedA32(*p);
if (b < minB) minB = b;
if (g < minG) minG = g;
if (r < minR) minR = r;
if (a < minA) minA = a;
}
*dptr = SkPackARGB32(minA, minR, minG, minB);
dptr += dstStrideY;
lp += srcStrideY;
up += srcStrideY;
}
if (x >= radius) src += srcStrideX;
if (x + radius < width - 1) upperSrc += srcStrideX;
dst += dstStrideX;
}
}
static void dilate(const SkPMColor* src, SkPMColor* dst,
int radius, int width, int height,
int srcStrideX, int srcStrideY,
int dstStrideX, int dstStrideY)
{
radius = SkMin32(radius, width - 1);
const SkPMColor* upperSrc = src + radius * srcStrideX;
for (int x = 0; x < width; ++x) {
const SkPMColor* lp = src;
const SkPMColor* up = upperSrc;
SkPMColor* dptr = dst;
for (int y = 0; y < height; ++y) {
int maxB = 0, maxG = 0, maxR = 0, maxA = 0;
for (const SkPMColor* p = lp; p <= up; p += srcStrideX) {
int b = SkGetPackedB32(*p);
int g = SkGetPackedG32(*p);
int r = SkGetPackedR32(*p);
int a = SkGetPackedA32(*p);
if (b > maxB) maxB = b;
if (g > maxG) maxG = g;
if (r > maxR) maxR = r;
if (a > maxA) maxA = a;
}
*dptr = SkPackARGB32(maxA, maxR, maxG, maxB);
dptr += dstStrideY;
lp += srcStrideY;
up += srcStrideY;
}
if (x >= radius) src += srcStrideX;
if (x + radius < width - 1) upperSrc += srcStrideX;
dst += dstStrideX;
}
}
static uint32_t get_argb8888_neighbor_avg_color(const SkBitmap& bitmap,
int xOrig, int yOrig) {
uint8_t count = 0;
uint16_t r = 0;
uint16_t g = 0;
uint16_t b = 0;
for (int y = yOrig - 1; y <= yOrig + 1; y++) {
if (y < 0 || y >= bitmap.height()) {
continue;
}
uint32_t* src = bitmap.getAddr32(0, y);
for (int x = xOrig - 1; x <= xOrig + 1; x++) {
if (x < 0 || x >= bitmap.width()) {
continue;
}
if (SkGetPackedA32(src[x]) != SK_AlphaTRANSPARENT) {
uint32_t color = remove_alpha_argb8888(src[x]);
r += SkGetPackedR32(color);
g += SkGetPackedG32(color);
b += SkGetPackedB32(color);
count++;
}
}
}
if (count == 0) {
return SkPackARGB32NoCheck(SK_AlphaOPAQUE, 0, 0, 0);
} else {
return SkPackARGB32NoCheck(SK_AlphaOPAQUE,
r / count, g / count, b / count);
}
}
void SkGL::SetColor(SkColor c) {
SkPMColor pm = SkPreMultiplyColor(c);
gl_pmcolor(SkGetPackedR32(pm),
SkGetPackedG32(pm),
SkGetPackedB32(pm),
SkGetPackedA32(pm));
}
/* It is necessary to average the color component of transparent
pixels with their surrounding neighbors since the PDF renderer may
separately re-sample the alpha and color channels when the image is
not displayed at its native resolution. Since an alpha of zero
gives no information about the color component, the pathological
case is a white image with sharp transparency bounds - the color
channel goes to black, and the should-be-transparent pixels are
rendered as grey because of the separate soft mask and color
resizing. e.g.: gm/bitmappremul.cpp */
static void get_neighbor_avg_color(const SkBitmap& bm,
int xOrig,
int yOrig,
uint8_t rgb[3]) {
SkASSERT(kN32_SkColorType == bm.colorType());
unsigned a = 0, r = 0, g = 0, b = 0;
// Clamp the range to the edge of the bitmap.
int ymin = SkTMax(0, yOrig - 1);
int ymax = SkTMin(yOrig + 1, bm.height() - 1);
int xmin = SkTMax(0, xOrig - 1);
int xmax = SkTMin(xOrig + 1, bm.width() - 1);
for (int y = ymin; y <= ymax; ++y) {
SkPMColor* scanline = bm.getAddr32(0, y);
for (int x = xmin; x <= xmax; ++x) {
SkPMColor pmColor = scanline[x];
a += SkGetPackedA32(pmColor);
r += SkGetPackedR32(pmColor);
g += SkGetPackedG32(pmColor);
b += SkGetPackedB32(pmColor);
}
}
if (a > 0) {
rgb[0] = SkToU8(255 * r / a);
rgb[1] = SkToU8(255 * g / a);
rgb[2] = SkToU8(255 * b / a);
} else {
rgb[0] = rgb[1] = rgb[2] = 0;
}
}
/**
* Interprets c as an unpremultiplied color, and returns the
* premultiplied equivalent.
*/
static SkPMColor premultiply_unpmcolor(SkPMColor c) {
U8CPU a = SkGetPackedA32(c);
U8CPU r = SkGetPackedR32(c);
U8CPU g = SkGetPackedG32(c);
U8CPU b = SkGetPackedB32(c);
return SkPreMultiplyARGB(a, r, g, b);
}
static int similarBits(const SkBitmap& gr, const SkBitmap& sk) {
const int kRowCount = 3;
const int kThreshold = 3;
int width = SkTMin(gr.width(), sk.width());
if (width < kRowCount) {
return true;
}
int height = SkTMin(gr.height(), sk.height());
if (height < kRowCount) {
return true;
}
int errorTotal = 0;
SkTArray<int, true> errorRows;
errorRows.push_back_n(width * kRowCount);
SkAutoLockPixels autoGr(gr);
SkAutoLockPixels autoSk(sk);
for (int y = 0; y < height; ++y) {
SkPMColor* grRow = gr.getAddr32(0, y);
SkPMColor* skRow = sk.getAddr32(0, y);
int* base = &errorRows[0];
int* cOut = &errorRows[y % kRowCount];
for (int x = 0; x < width; ++x) {
SkPMColor grColor = grRow[x];
SkPMColor skColor = skRow[x];
int dr = SkGetPackedR32(grColor) - SkGetPackedR32(skColor);
int dg = SkGetPackedG32(grColor) - SkGetPackedG32(skColor);
int db = SkGetPackedB32(grColor) - SkGetPackedB32(skColor);
int error = cOut[x] = SkTMax(SkAbs32(dr), SkTMax(SkAbs32(dg), SkAbs32(db)));
if (error < kThreshold || x < 2) {
continue;
}
if (base[x - 2] < kThreshold
|| base[width + x - 2] < kThreshold
|| base[width * 2 + x - 2] < kThreshold
|| base[x - 1] < kThreshold
|| base[width + x - 1] < kThreshold
|| base[width * 2 + x - 1] < kThreshold
|| base[x] < kThreshold
|| base[width + x] < kThreshold
|| base[width * 2 + x] < kThreshold) {
continue;
}
errorTotal += error;
}
}
return errorTotal;
}
// Returns an unpremultiplied version of color. It will have the same ordering and size as an
// SkPMColor, but the alpha will not be premultiplied.
static SkPMColor unpremultiply_pmcolor(SkPMColor color) {
U8CPU a = SkGetPackedA32(color);
const SkUnPreMultiply::Scale scale = SkUnPreMultiply::GetScale(a);
return SkPackARGB32NoCheck(a,
SkUnPreMultiply::ApplyScale(scale, SkGetPackedR32(color)),
SkUnPreMultiply::ApplyScale(scale, SkGetPackedG32(color)),
SkUnPreMultiply::ApplyScale(scale, SkGetPackedB32(color)));
}
static void preMultipliedBGRAtoRGB(const SkPMColor* input, unsigned int pixels, unsigned char* output)
{
for (; pixels-- > 0; ++input) {
*output++ = SkGetPackedR32(*input);
*output++ = SkGetPackedG32(*input);
*output++ = SkGetPackedB32(*input);
}
}
static SkPMColor lighten_modeproc(SkPMColor src, SkPMColor dst) {
unsigned sa = SkGetPackedA32(src);
unsigned da = SkGetPackedA32(dst);
unsigned src_scale = SkAlpha255To256(255 - sa);
unsigned dst_scale = SkAlpha255To256(255 - da);
unsigned ra = sa + da - SkAlphaMulAlpha(sa, da);
unsigned rr = lighten_p(SkGetPackedR32(src), SkGetPackedR32(dst),
src_scale, dst_scale);
unsigned rg = lighten_p(SkGetPackedG32(src), SkGetPackedG32(dst),
src_scale, dst_scale);
unsigned rb = lighten_p(SkGetPackedB32(src), SkGetPackedB32(dst),
src_scale, dst_scale);
return SkPackARGB32(ra, SkFastMin32(rr, ra),
SkFastMin32(rg, ra), SkFastMin32(rb, ra));
}
static void preMultipliedBGRAtoRGB(const unsigned char* pixels, unsigned int pixelCount, unsigned char* output)
{
const SkPMColor* input = reinterpret_cast_ptr<const SkPMColor*>(pixels);
for (; pixelCount-- > 0; ++input) {
*output++ = SkGetPackedR32(*input);
*output++ = SkGetPackedG32(*input);
*output++ = SkGetPackedB32(*input);
}
}
