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);
}
}
}
}
/**
* This is the path for apply_kernel_interp() to be taken when the kernel
* is wider than the source image.
*/
static void kernel_interp_clamped(uint8_t dst[], int rx, int ry,
const uint32_t sum[], int sw, int sh, U8CPU outerWeight) {
SkASSERT(2*rx > sw);
int innerWeight = 255 - outerWeight;
// round these guys up if they're bigger than 127
outerWeight += outerWeight >> 7;
innerWeight += innerWeight >> 7;
uint32_t outerScale = (outerWeight << 16) / ((2*rx + 1)*(2*ry + 1));
uint32_t innerScale = (innerWeight << 16) / ((2*rx - 1)*(2*ry - 1));
int sumStride = sw + 1;
int dw = sw + 2*rx;
int dh = sh + 2*ry;
int prev_y = -2*ry;
int next_y = 1;
for (int y = 0; y < dh; ++y) {
int py = SkClampPos(prev_y) * sumStride;
int ny = SkFastMin32(next_y, sh) * sumStride;
int ipy = SkClampPos(prev_y + 1) * sumStride;
int iny = SkClampMax(next_y - 1, sh) * sumStride;
int prev_x = -2*rx;
int next_x = 1;
for (int x = 0; x < dw; ++x) {
int px = SkClampPos(prev_x);
int nx = SkFastMin32(next_x, sw);
int ipx = SkClampPos(prev_x + 1);
int inx = SkClampMax(next_x - 1, sw);
uint32_t outerSum = sum[px+py] + sum[nx+ny]
- sum[nx+py] - sum[px+ny];
uint32_t innerSum = sum[ipx+ipy] + sum[inx+iny]
- sum[inx+ipy] - sum[ipx+iny];
*dst++ = SkToU8((outerSum * outerScale
+ innerSum * innerScale) >> 24);
prev_x += 1;
next_x += 1;
}
prev_y += 1;
next_y += 1;
}
}
// Perform a brute force convolution of a step function with a Gaussian.
// Return the right half in 'result'
static void brute_force_1d(SkScalar stepMin, SkScalar stepMax,
SkScalar gaussianSigma,
int* result, int resultCount) {
int gaussianRange = SkScalarCeilToInt(10 * gaussianSigma);
for (int i = 0; i < resultCount; ++i) {
SkScalar sum = 0.0f;
for (int j = -gaussianRange; j < gaussianRange; ++j) {
sum += gaussian(j, gaussianSigma) * step(i-j, stepMin, stepMax);
}
result[i] = SkClampMax(SkClampPos(int(sum + 0.5f)), 255);
}
}
bool SkAnimatorScript::EvalRGB(const char* function, size_t len, SkTDArray<SkScriptValue>& params,
void* eng, SkScriptValue* value) {
if (SK_LITERAL_STR_EQUAL("rgb", function, len) == false)
return false;
if (params.count() != 3)
return false;
SkScriptEngine* engine = (SkScriptEngine*) eng;
unsigned result = 0xFF000000;
int shift = 16;
for (SkScriptValue* valuePtr = params.begin(); valuePtr < params.end(); valuePtr++) {
engine->convertTo(SkType_Int, valuePtr);
result |= SkClampMax(valuePtr->fOperand.fS32, 255) << shift;
shift -= 8;
}
value->fOperand.fS32 = result;
value->fType = SkType_Int;
return true;
}
// One-stop-shop shader for,
// - nearest-neighbor sampling (_nofilter_),
// - clamp tiling in X and Y both (Clamp_),
// - with at most a scale and translate matrix (_DX_),
// - and no extra alpha applied (_opaque_),
// - sampling from 8888 (_S32_) and drawing to 8888 (_S32_).
static void Clamp_S32_opaque_D32_nofilter_DX_shaderproc(const void* sIn, int x, int y,
SkPMColor* dst, int count) {
const SkBitmapProcState& s = *static_cast<const SkBitmapProcState*>(sIn);
SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask |
SkMatrix::kScale_Mask)) == 0);
SkASSERT(s.fAlphaScale == 256);
const unsigned maxX = s.fPixmap.width() - 1;
SkFractionalInt fx;
int dstY;
{
const SkBitmapProcStateAutoMapper mapper(s, x, y);
const unsigned maxY = s.fPixmap.height() - 1;
dstY = SkClampMax(mapper.intY(), maxY);
fx = mapper.fractionalIntX();
}
const SkPMColor* src = s.fPixmap.addr32(0, dstY);
const SkFractionalInt dx = s.fInvSxFractionalInt;
// Check if we're safely inside [0...maxX] so no need to clamp each computed index.
//
if ((uint64_t)SkFractionalIntToInt(fx) <= maxX &&
(uint64_t)SkFractionalIntToInt(fx + dx * (count - 1)) <= maxX)
{
int count4 = count >> 2;
for (int i = 0; i < count4; ++i) {
SkPMColor src0 = src[SkFractionalIntToInt(fx)]; fx += dx;
SkPMColor src1 = src[SkFractionalIntToInt(fx)]; fx += dx;
SkPMColor src2 = src[SkFractionalIntToInt(fx)]; fx += dx;
SkPMColor src3 = src[SkFractionalIntToInt(fx)]; fx += dx;
dst[0] = src0;
dst[1] = src1;
dst[2] = src2;
dst[3] = src3;
dst += 4;
}
for (int i = (count4 << 2); i < count; ++i) {
unsigned index = SkFractionalIntToInt(fx);
SkASSERT(index <= maxX);
*dst++ = src[index];
fx += dx;
}
} else {
static SkBitmap indexed_bitmap() {
SkBitmap n32bitmap;
n32bitmap.allocN32Pixels(SCALE, SCALE);
n32bitmap.eraseColor(SK_ColorTRANSPARENT);
SkCanvas canvas(n32bitmap);
color_wheel_native(&canvas);
const SkColor colors[] = {
SK_ColorTRANSPARENT,
SK_ColorWHITE,
SK_ColorBLACK,
SK_ColorRED,
SK_ColorGREEN,
SK_ColorBLUE,
SK_ColorCYAN,
SK_ColorMAGENTA,
SK_ColorYELLOW,
};
SkPMColor pmColors[SK_ARRAY_COUNT(colors)];
for (size_t i = 0; i < SK_ARRAY_COUNT(colors); ++i) {
pmColors[i] = premultiply_color(colors[i]);
}
SkBitmap bm;
SkAutoTUnref<SkColorTable> ctable(new SkColorTable(pmColors, SK_ARRAY_COUNT(pmColors)));
SkImageInfo info = SkImageInfo::Make(SCALE, SCALE, kIndex_8_SkColorType,
kPremul_SkAlphaType);
bm.allocPixels(info, nullptr, ctable);
SkAutoLockPixels autoLockPixels1(n32bitmap);
SkAutoLockPixels autoLockPixels2(bm);
for (int y = 0; y < SCALE; ++y) {
for (int x = 0; x < SCALE; ++x) {
SkPMColor c = *n32bitmap.getAddr32(x, y);
int idx = find(pmColors, SK_ARRAY_COUNT(pmColors), c);
*bm.getAddr8(x, y) = SkClampMax(idx, SK_ARRAY_COUNT(pmColors) - 1);
}
}
return bm;
}
SkScalar fy, SkScalar dy,
SkScalar b, SkScalar db,
SkScalar fSr2D2, SkScalar foura, SkScalar fOneOverTwoA, bool posRoot,
SkPMColor* SK_RESTRICT dstC, const SkPMColor* SK_RESTRICT cache,
int count);
void shadeSpan_twopoint_clamp(SkScalar fx, SkScalar dx,
SkScalar fy, SkScalar dy,
SkScalar b, SkScalar db,
SkScalar fSr2D2, SkScalar foura, SkScalar fOneOverTwoA, bool posRoot,
SkPMColor* SK_RESTRICT dstC, const SkPMColor* SK_RESTRICT cache,
int count) {
for (; count > 0; --count) {
SkFixed t = two_point_radial(b, fx, fy, fSr2D2, foura,
fOneOverTwoA, posRoot);
SkFixed index = SkClampMax(t, 0xFFFF);
SkASSERT(index <= 0xFFFF);
*dstC++ = cache[index >> SkGradientShaderBase::kCache32Shift];
fx += dx;
fy += dy;
b += db;
}
}
void shadeSpan_twopoint_mirror(SkScalar fx, SkScalar dx,
SkScalar fy, SkScalar dy,
SkScalar b, SkScalar db,
SkScalar fSr2D2, SkScalar foura, SkScalar fOneOverTwoA, bool posRoot,
SkPMColor* SK_RESTRICT dstC, const SkPMColor* SK_RESTRICT cache,
int count) {
for (; count > 0; --count) {
SkFixed t = two_point_radial(b, fx, fy, fSr2D2, foura,
static inline SkPMColor fetch(const SkBitmap& src, int x, int y) {
x = SkClampMax(x, src.width() - 1);
y = SkClampMax(y, src.height() - 1);
return *src.getAddr32(x, y);
}
template <typename Color, typename ColorPacker>
void highQualityFilter(ColorPacker pack, const SkBitmapProcState& s, int x, int y, Color* SK_RESTRICT colors, int count) {
const int maxX = s.fBitmap->width();
const int maxY = s.fBitmap->height();
while (count-- > 0) {
SkPoint srcPt;
s.fInvProc(s.fInvMatrix, x + 0.5f,
y + 0.5f, &srcPt);
srcPt.fX -= SK_ScalarHalf;
srcPt.fY -= SK_ScalarHalf;
SkScalar weight = 0;
SkScalar fr = 0, fg = 0, fb = 0, fa = 0;
int y0 = SkClampMax(SkScalarCeilToInt(srcPt.fY-s.getBitmapFilter()->width()), maxY);
int y1 = SkClampMax(SkScalarFloorToInt(srcPt.fY+s.getBitmapFilter()->width()+1), maxY);
int x0 = SkClampMax(SkScalarCeilToInt(srcPt.fX-s.getBitmapFilter()->width()), maxX);
int x1 = SkClampMax(SkScalarFloorToInt(srcPt.fX+s.getBitmapFilter()->width())+1, maxX);
for (int srcY = y0; srcY < y1; srcY++) {
SkScalar yWeight = s.getBitmapFilter()->lookupScalar((srcPt.fY - srcY));
for (int srcX = x0; srcX < x1 ; srcX++) {
SkScalar xWeight = s.getBitmapFilter()->lookupScalar((srcPt.fX - srcX));
SkScalar combined_weight = SkScalarMul(xWeight, yWeight);
SkPMColor c = *s.fBitmap->getAddr32(srcX, srcY);
fr += combined_weight * SkGetPackedR32(c);
fg += combined_weight * SkGetPackedG32(c);
bool SkBlurMask::BlurGroundTruth(SkMask* dst, const SkMask& src, SkScalar provided_radius,
Style style, SkIPoint* margin) {
if (src.fFormat != SkMask::kA8_Format) {
return false;
}
float radius = SkScalarToFloat(SkScalarMul(provided_radius, kBlurRadiusFudgeFactor));
float stddev = SkScalarToFloat(radius) /2.0f;
float variance = stddev * stddev;
int windowSize = SkScalarCeil(stddev*4);
// round window size up to nearest odd number
windowSize |= 1;
SkAutoTMalloc<float> gaussWindow(windowSize);
int halfWindow = windowSize >> 1;
gaussWindow[halfWindow] = 1;
float windowSum = 1;
for (int x = 1 ; x <= halfWindow ; ++x) {
float gaussian = expf(-x*x / variance);
gaussWindow[halfWindow + x] = gaussWindow[halfWindow-x] = gaussian;
windowSum += 2*gaussian;
}
// leave the filter un-normalized for now; we will divide by the normalization
// sum later;
int pad = halfWindow;
if (margin) {
margin->set( pad, pad );
}
dst->fBounds = src.fBounds;
dst->fBounds.outset(pad, pad);
dst->fRowBytes = dst->fBounds.width();
dst->fFormat = SkMask::kA8_Format;
dst->fImage = NULL;
if (src.fImage) {
size_t dstSize = dst->computeImageSize();
if (0 == dstSize) {
return false; // too big to allocate, abort
}
int srcWidth = src.fBounds.width();
int srcHeight = src.fBounds.height();
int dstWidth = dst->fBounds.width();
const uint8_t* srcPixels = src.fImage;
uint8_t* dstPixels = SkMask::AllocImage(dstSize);
SkAutoTCallVProc<uint8_t, SkMask_FreeImage> autoCall(dstPixels);
// do the actual blur. First, make a padded copy of the source.
// use double pad so we never have to check if we're outside anything
int padWidth = srcWidth + 4*pad;
int padHeight = srcHeight;
int padSize = padWidth * padHeight;
SkAutoTMalloc<uint8_t> padPixels(padSize);
memset(padPixels, 0, padSize);
for (int y = 0 ; y < srcHeight; ++y) {
uint8_t* padptr = padPixels + y * padWidth + 2*pad;
const uint8_t* srcptr = srcPixels + y * srcWidth;
memcpy(padptr, srcptr, srcWidth);
}
// blur in X, transposing the result into a temporary floating point buffer.
// also double-pad the intermediate result so that the second blur doesn't
// have to do extra conditionals.
int tmpWidth = padHeight + 4*pad;
int tmpHeight = padWidth - 2*pad;
int tmpSize = tmpWidth * tmpHeight;
SkAutoTMalloc<float> tmpImage(tmpSize);
memset(tmpImage, 0, tmpSize*sizeof(tmpImage[0]));
for (int y = 0 ; y < padHeight ; ++y) {
uint8_t *srcScanline = padPixels + y*padWidth;
for (int x = pad ; x < padWidth - pad ; ++x) {
float *outPixel = tmpImage + (x-pad)*tmpWidth + y + 2*pad; // transposed output
uint8_t *windowCenter = srcScanline + x;
for (int i = -pad ; i <= pad ; ++i) {
*outPixel += gaussWindow[pad+i]*windowCenter[i];
}
*outPixel /= windowSum;
}
}
// blur in Y; now filling in the actual desired destination. We have to do
// the transpose again; these transposes guarantee that we read memory in
// linear order.
for (int y = 0 ; y < tmpHeight ; ++y) {
float *srcScanline = tmpImage + y*tmpWidth;
for (int x = pad ; x < tmpWidth - pad ; ++x) {
float *windowCenter = srcScanline + x;
float finalValue = 0;
for (int i = -pad ; i <= pad ; ++i) {
finalValue += gaussWindow[pad+i]*windowCenter[i];
}
finalValue /= windowSum;
uint8_t *outPixel = dstPixels + (x-pad)*dstWidth + y; // transposed output
int integerPixel = int(finalValue + 0.5f);
*outPixel = SkClampMax( SkClampPos(integerPixel), 255 );
}
}
dst->fImage = dstPixels;
// if need be, alloc the "real" dst (same size as src) and copy/merge
// the blur into it (applying the src)
if (style == kInner_Style) {
// now we allocate the "real" dst, mirror the size of src
size_t srcSize = src.computeImageSize();
if (0 == srcSize) {
return false; // too big to allocate, abort
}
dst->fImage = SkMask::AllocImage(srcSize);
merge_src_with_blur(dst->fImage, src.fRowBytes,
srcPixels, src.fRowBytes,
dstPixels + pad*dst->fRowBytes + pad,
dst->fRowBytes, srcWidth, srcHeight);
SkMask::FreeImage(dstPixels);
} else if (style != kNormal_Style) {
clamp_with_orig(dstPixels + pad*dst->fRowBytes + pad,
dst->fRowBytes, srcPixels, src.fRowBytes, srcWidth, srcHeight, style);
}
(void)autoCall.detach();
}
if (style == kInner_Style) {
dst->fBounds = src.fBounds; // restore trimmed bounds
dst->fRowBytes = src.fRowBytes;
}
return true;
}
}
static void Clamp_S32_D32_nofilter_trans_shaderproc(const void* sIn,
int x, int y,
SkPMColor* SK_RESTRICT colors,
int count) {
const SkBitmapProcState& s = *static_cast<const SkBitmapProcState*>(sIn);
SkASSERT(((s.fInvType & ~SkMatrix::kTranslate_Mask)) == 0);
SkASSERT(s.fInvKy == 0);
SkASSERT(count > 0 && colors != nullptr);
SkASSERT(kNone_SkFilterQuality == s.fFilterQuality);
const int maxX = s.fPixmap.width() - 1;
const int maxY = s.fPixmap.height() - 1;
int ix = s.fFilterOneX + x;
int iy = SkClampMax(s.fFilterOneY + y, maxY);
const SkPMColor* row = s.fPixmap.addr32(0, iy);
// clamp to the left
if (ix < 0) {
int n = SkMin32(-ix, count);
sk_memset32(colors, row[0], n);
count -= n;
if (0 == count) {
return;
}
colors += n;
SkASSERT(-ix == n);
ix = 0;
}
// copy the middle
/**
* sw and sh are the width and height of the src. Since the sum buffer
* matches that, but has an extra row and col at the beginning (with zeros),
* we can just use sw and sh as our "max" values for pinning coordinates
* when sampling into sum[][]
*
* The inner loop is conceptually simple; we break it into several variants
* to improve performance. Here's the original version:
for (int x = 0; x < dw; ++x) {
int px = SkClampPos(prev_x);
int nx = SkFastMin32(next_x, sw);
int ipx = SkClampPos(prev_x + 1);
int inx = SkClampMax(next_x - 1, sw);
uint32_t outerSum = sum[px+py] + sum[nx+ny]
- sum[nx+py] - sum[px+ny];
uint32_t innerSum = sum[ipx+ipy] + sum[inx+iny]
- sum[inx+ipy] - sum[ipx+iny];
*dst++ = SkToU8((outerSum * outerScale
+ innerSum * innerScale) >> 24);
prev_x += 1;
next_x += 1;
}
* The sections are:
* left-hand section, where prev_x is clamped to 0
* center section, where neither prev_x nor next_x is clamped
* right-hand section, where next_x is clamped to sw
* On some operating systems, the center section is unrolled for additional
* speedup.
*/
static void apply_kernel_interp(uint8_t dst[], int rx, int ry,
const uint32_t sum[], int sw, int sh, U8CPU outerWeight) {
SkASSERT(rx > 0 && ry > 0);
SkASSERT(outerWeight <= 255);
if (2*rx > sw) {
kernel_interp_clamped(dst, rx, ry, sum, sw, sh, outerWeight);
return;
}
int innerWeight = 255 - outerWeight;
// round these guys up if they're bigger than 127
outerWeight += outerWeight >> 7;
innerWeight += innerWeight >> 7;
uint32_t outerScale = (outerWeight << 16) / ((2*rx + 1)*(2*ry + 1));
uint32_t innerScale = (innerWeight << 16) / ((2*rx - 1)*(2*ry - 1));
int sumStride = sw + 1;
int dw = sw + 2*rx;
int dh = sh + 2*ry;
int prev_y = -2*ry;
int next_y = 1;
SkASSERT(2*rx <= dw - 2*rx);
for (int y = 0; y < dh; ++y) {
int py = SkClampPos(prev_y) * sumStride;
int ny = SkFastMin32(next_y, sh) * sumStride;
int ipy = SkClampPos(prev_y + 1) * sumStride;
int iny = SkClampMax(next_y - 1, sh) * sumStride;
int prev_x = -2*rx;
int next_x = 1;
int x = 0;
for (; x < 2*rx; ++x) {
SkASSERT(prev_x < 0);
SkASSERT(next_x <= sw);
int px = 0;
int nx = next_x;
int ipx = 0;
int inx = next_x - 1;
uint32_t outerSum = sum[px+py] + sum[nx+ny]
- sum[nx+py] - sum[px+ny];
uint32_t innerSum = sum[ipx+ipy] + sum[inx+iny]
- sum[inx+ipy] - sum[ipx+iny];
*dst++ = SkToU8((outerSum * outerScale
+ innerSum * innerScale) >> 24);
prev_x += 1;
next_x += 1;
}
int i0 = prev_x + py;
int i1 = next_x + ny;
int i2 = next_x + py;
int i3 = prev_x + ny;
int i4 = prev_x + 1 + ipy;
int i5 = next_x - 1 + iny;
int i6 = next_x - 1 + ipy;
int i7 = prev_x + 1 + iny;
#if UNROLL_KERNEL_LOOP
for (; x < dw - 2*rx - 4; x += 4) {
SkASSERT(prev_x >= 0);
SkASSERT(next_x <= sw);
uint32_t outerSum = sum[i0++] + sum[i1++] - sum[i2++] - sum[i3++];
uint32_t innerSum = sum[i4++] + sum[i5++] - sum[i6++] - sum[i7++];
*dst++ = SkToU8((outerSum * outerScale
+ innerSum * innerScale) >> 24);
outerSum = sum[i0++] + sum[i1++] - sum[i2++] - sum[i3++];
innerSum = sum[i4++] + sum[i5++] - sum[i6++] - sum[i7++];
*dst++ = SkToU8((outerSum * outerScale
+ innerSum * innerScale) >> 24);
outerSum = sum[i0++] + sum[i1++] - sum[i2++] - sum[i3++];
innerSum = sum[i4++] + sum[i5++] - sum[i6++] - sum[i7++];
*dst++ = SkToU8((outerSum * outerScale
+ innerSum * innerScale) >> 24);
outerSum = sum[i0++] + sum[i1++] - sum[i2++] - sum[i3++];
innerSum = sum[i4++] + sum[i5++] - sum[i6++] - sum[i7++];
*dst++ = SkToU8((outerSum * outerScale
+ innerSum * innerScale) >> 24);
prev_x += 4;
next_x += 4;
}
#endif
for (; x < dw - 2*rx; ++x) {
SkASSERT(prev_x >= 0);
SkASSERT(next_x <= sw);
uint32_t outerSum = sum[i0++] + sum[i1++] - sum[i2++] - sum[i3++];
uint32_t innerSum = sum[i4++] + sum[i5++] - sum[i6++] - sum[i7++];
*dst++ = SkToU8((outerSum * outerScale
+ innerSum * innerScale) >> 24);
prev_x += 1;
next_x += 1;
}
for (; x < dw; ++x) {
SkASSERT(prev_x >= 0);
SkASSERT(next_x > sw);
int px = prev_x;
int nx = sw;
int ipx = prev_x + 1;
int inx = sw;
uint32_t outerSum = sum[px+py] + sum[nx+ny]
- sum[nx+py] - sum[px+ny];
uint32_t innerSum = sum[ipx+ipy] + sum[inx+iny]
- sum[inx+ipy] - sum[ipx+iny];
*dst++ = SkToU8((outerSum * outerScale
+ innerSum * innerScale) >> 24);
prev_x += 1;
next_x += 1;
}
prev_y += 1;
next_y += 1;
}
}
bool SkBicubicImageFilter::onFilterImage(Proxy* proxy,
const SkBitmap& source,
const SkMatrix& matrix,
SkBitmap* result,
SkIPoint* loc) {
SkBitmap src = source;
if (getInput(0) && !getInput(0)->filterImage(proxy, source, matrix, &src, loc)) {
return false;
}
if (src.config() != SkBitmap::kARGB_8888_Config) {
return false;
}
SkAutoLockPixels alp(src);
if (!src.getPixels()) {
return false;
}
SkRect dstRect = SkRect::MakeWH(SkScalarMul(SkIntToScalar(src.width()), fScale.fWidth),
SkScalarMul(SkIntToScalar(src.height()), fScale.fHeight));
SkIRect dstIRect;
dstRect.roundOut(&dstIRect);
result->setConfig(src.config(), dstIRect.width(), dstIRect.height());
result->allocPixels();
if (!result->getPixels()) {
return false;
}
SkRect srcRect;
src.getBounds(&srcRect);
SkMatrix inverse;
inverse.setRectToRect(dstRect, srcRect, SkMatrix::kFill_ScaleToFit);
inverse.postTranslate(SkFloatToScalar(-0.5f), SkFloatToScalar(-0.5f));
for (int y = dstIRect.fTop; y < dstIRect.fBottom; ++y) {
SkPMColor* dptr = result->getAddr32(dstIRect.fLeft, y);
for (int x = dstIRect.fLeft; x < dstIRect.fRight; ++x) {
SkPoint srcPt, dstPt = SkPoint::Make(SkIntToScalar(x), SkIntToScalar(y));
inverse.mapPoints(&srcPt, &dstPt, 1);
SkScalar fractx = srcPt.fX - SkScalarFloorToScalar(srcPt.fX);
SkScalar fracty = srcPt.fY - SkScalarFloorToScalar(srcPt.fY);
int sx = SkScalarFloorToInt(srcPt.fX);
int sy = SkScalarFloorToInt(srcPt.fY);
int x0 = SkClampMax(sx - 1, src.width() - 1);
int x1 = SkClampMax(sx , src.width() - 1);
int x2 = SkClampMax(sx + 1, src.width() - 1);
int x3 = SkClampMax(sx + 2, src.width() - 1);
int y0 = SkClampMax(sy - 1, src.height() - 1);
int y1 = SkClampMax(sy , src.height() - 1);
int y2 = SkClampMax(sy + 1, src.height() - 1);
int y3 = SkClampMax(sy + 2, src.height() - 1);
SkPMColor s00 = *src.getAddr32(x0, y0);
SkPMColor s10 = *src.getAddr32(x1, y0);
SkPMColor s20 = *src.getAddr32(x2, y0);
SkPMColor s30 = *src.getAddr32(x3, y0);
SkPMColor s0 = cubicBlend(fCoefficients, fractx, s00, s10, s20, s30);
SkPMColor s01 = *src.getAddr32(x0, y1);
SkPMColor s11 = *src.getAddr32(x1, y1);
SkPMColor s21 = *src.getAddr32(x2, y1);
SkPMColor s31 = *src.getAddr32(x3, y1);
SkPMColor s1 = cubicBlend(fCoefficients, fractx, s01, s11, s21, s31);
SkPMColor s02 = *src.getAddr32(x0, y2);
SkPMColor s12 = *src.getAddr32(x1, y2);
SkPMColor s22 = *src.getAddr32(x2, y2);
SkPMColor s32 = *src.getAddr32(x3, y2);
SkPMColor s2 = cubicBlend(fCoefficients, fractx, s02, s12, s22, s32);
SkPMColor s03 = *src.getAddr32(x0, y3);
SkPMColor s13 = *src.getAddr32(x1, y3);
SkPMColor s23 = *src.getAddr32(x2, y3);
SkPMColor s33 = *src.getAddr32(x3, y3);
SkPMColor s3 = cubicBlend(fCoefficients, fractx, s03, s13, s23, s33);
*dptr++ = cubicBlend(fCoefficients, fracty, s0, s1, s2, s3);
}
}
return true;
}
