| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkLinearBitmapPipeline_sampler_DEFINED |
| #define SkLinearBitmapPipeline_sampler_DEFINED |
| |
| #include <tuple> |
| |
| #include "SkColor.h" |
| #include "SkColorPriv.h" |
| #include "SkFixed.h" |
| #include "SkHalf.h" |
| #include "SkLinearBitmapPipeline_core.h" |
| #include "SkNx.h" |
| #include "SkPM4fPriv.h" |
| |
| namespace { |
| // Explaination of the math: |
| // 1 - x x |
| // +--------+--------+ |
| // | | | |
| // 1 - y | px00 | px10 | |
| // | | | |
| // +--------+--------+ |
| // | | | |
| // y | px01 | px11 | |
| // | | | |
| // +--------+--------+ |
| // |
| // |
| // Given a pixelxy each is multiplied by a different factor derived from the fractional part of x |
| // and y: |
| // * px00 -> (1 - x)(1 - y) = 1 - x - y + xy |
| // * px10 -> x(1 - y) = x - xy |
| // * px01 -> (1 - x)y = y - xy |
| // * px11 -> xy |
| // So x * y is calculated first and then used to calculate all the other factors. |
| static Sk4s VECTORCALL bilerp4(Sk4s xs, Sk4s ys, Sk4f px00, Sk4f px10, |
| Sk4f px01, Sk4f px11) { |
| // Calculate fractional xs and ys. |
| Sk4s fxs = xs - xs.floor(); |
| Sk4s fys = ys - ys.floor(); |
| Sk4s fxys{fxs * fys}; |
| Sk4f sum = px11 * fxys; |
| sum = sum + px01 * (fys - fxys); |
| sum = sum + px10 * (fxs - fxys); |
| sum = sum + px00 * (Sk4f{1.0f} - fxs - fys + fxys); |
| return sum; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////////////////////////// |
| // PixelGetter is the lowest level interface to the source data. There is a PixelGetter for each |
| // of the different SkColorTypes. |
| template <SkColorType colorType, SkColorProfileType colorProfile> class PixelGetter; |
| |
| // Alpha handling: |
| // The alpha from the paint (tintColor) is used in the blend part of the pipeline to modulate |
| // the entire bitmap. So, the tint color is given an alpha of 1.0 so that the later alpha can |
| // modulate this color later. |
| template <> |
| class PixelGetter<kAlpha_8_SkColorType, kLinear_SkColorProfileType> { |
| public: |
| using Element = uint8_t; |
| PixelGetter(const SkPixmap& srcPixmap, SkColor tintColor) |
| : fTintColor{set_alpha(Sk4f_from_SkColor(tintColor), 1.0f)} { } |
| |
| Sk4f getPixelAt(const uint8_t* src) { |
| return fTintColor * (*src * (1.0f/255.0f)); |
| } |
| |
| private: |
| const Sk4f fTintColor; |
| }; |
| |
| template <SkColorProfileType colorProfile> |
| class PixelGetter<kRGB_565_SkColorType, colorProfile> { |
| public: |
| using Element = uint16_t; |
| PixelGetter(const SkPixmap& srcPixmap) { } |
| |
| Sk4f getPixelAt(const uint16_t* src) { |
| SkPMColor pixel = SkPixel16ToPixel32(*src); |
| return colorProfile == kSRGB_SkColorProfileType |
| ? Sk4f_fromS32(pixel) |
| : Sk4f_fromL32(pixel); |
| } |
| }; |
| |
| template <SkColorProfileType colorProfile> |
| class PixelGetter<kARGB_4444_SkColorType, colorProfile> { |
| public: |
| using Element = uint16_t; |
| PixelGetter(const SkPixmap& srcPixmap) { } |
| |
| Sk4f getPixelAt(const uint16_t* src) { |
| SkPMColor pixel = SkPixel4444ToPixel32(*src); |
| return colorProfile == kSRGB_SkColorProfileType |
| ? Sk4f_fromS32(pixel) |
| : Sk4f_fromL32(pixel); |
| } |
| }; |
| |
| template <SkColorProfileType colorProfile> |
| class PixelGetter<kRGBA_8888_SkColorType, colorProfile> { |
| public: |
| using Element = uint32_t; |
| PixelGetter(const SkPixmap& srcPixmap) { } |
| |
| Sk4f getPixelAt(const uint32_t* src) { |
| return colorProfile == kSRGB_SkColorProfileType |
| ? Sk4f_fromS32(*src) |
| : Sk4f_fromL32(*src); |
| } |
| }; |
| |
| template <SkColorProfileType colorProfile> |
| class PixelGetter<kBGRA_8888_SkColorType, colorProfile> { |
| public: |
| using Element = uint32_t; |
| PixelGetter(const SkPixmap& srcPixmap) { } |
| |
| Sk4f getPixelAt(const uint32_t* src) { |
| Sk4f pixel = colorProfile == kSRGB_SkColorProfileType |
| ? Sk4f_fromS32(*src) |
| : Sk4f_fromL32(*src); |
| return swizzle_rb(pixel); |
| } |
| }; |
| |
| template <SkColorProfileType colorProfile> |
| class PixelGetter<kIndex_8_SkColorType, colorProfile> { |
| public: |
| using Element = uint8_t; |
| PixelGetter(const SkPixmap& srcPixmap) { |
| SkColorTable* skColorTable = srcPixmap.ctable(); |
| SkASSERT(skColorTable != nullptr); |
| |
| fColorTable = (Sk4f*)SkAlign16((intptr_t)fColorTableStorage.get()); |
| for (int i = 0; i < skColorTable->count(); i++) { |
| fColorTable[i] = this->convertPixel((*skColorTable)[i]); |
| } |
| } |
| |
| PixelGetter(const PixelGetter& strategy) { |
| fColorTable = (Sk4f*)SkAlign16((intptr_t)fColorTableStorage.get()); |
| // TODO: figure out the count. |
| for (int i = 0; i < 256; i++) { |
| fColorTable[i] = strategy.fColorTable[i]; |
| } |
| } |
| |
| Sk4f getPixelAt(const uint8_t* src) { |
| return fColorTable[*src]; |
| } |
| |
| private: |
| static const size_t kColorTableSize = sizeof(Sk4f[256]) + 12; |
| Sk4f convertPixel(SkPMColor pmColor) { |
| Sk4f pixel = to_4f(pmColor); |
| float alpha = get_alpha(pixel); |
| if (alpha != 0.0f) { |
| float invAlpha = 1.0f / alpha; |
| Sk4f normalize = {invAlpha, invAlpha, invAlpha, 1.0f / 255.0f}; |
| pixel = pixel * normalize; |
| if (colorProfile == kSRGB_SkColorProfileType) { |
| pixel = linear_to_srgb(pixel); |
| } |
| return pixel; |
| } else { |
| return Sk4f{0.0f}; |
| } |
| } |
| SkAutoMalloc fColorTableStorage{kColorTableSize}; |
| Sk4f* fColorTable; |
| }; |
| |
| template <SkColorProfileType colorProfile> |
| class PixelGetter<kGray_8_SkColorType, colorProfile> { |
| public: |
| using Element = uint8_t; |
| PixelGetter(const SkPixmap& srcPixmap) { } |
| |
| Sk4f getPixelAt(const uint8_t* src) { |
| float gray = *src * (1.0f/255.0f); |
| Sk4f pixel = Sk4f{gray, gray, gray, 1.0f}; |
| return colorProfile == kSRGB_SkColorProfileType |
| ? srgb_to_linear(pixel) |
| : pixel; |
| } |
| }; |
| |
| template <> |
| class PixelGetter<kRGBA_F16_SkColorType, kLinear_SkColorProfileType> { |
| public: |
| using Element = uint64_t; |
| PixelGetter(const SkPixmap& srcPixmap) { } |
| |
| Sk4f getPixelAt(const uint64_t* src) { |
| return SkHalfToFloat_01(*src); |
| } |
| }; |
| |
| //////////////////////////////////////////////////////////////////////////////////////////////////// |
| // PixelAccessor handles all the same plumbing for all the PixelGetters. |
| template <SkColorType colorType, SkColorProfileType colorProfile> |
| class PixelAccessor { |
| using Element = typename PixelGetter<colorType, colorProfile>::Element; |
| public: |
| template <typename... Args> |
| PixelAccessor(const SkPixmap& srcPixmap, Args&&... args) |
| : fSrc{static_cast<const Element*>(srcPixmap.addr())} |
| , fWidth{srcPixmap.rowBytesAsPixels()} |
| , fGetter{srcPixmap, std::move<Args>(args)...} { } |
| |
| void VECTORCALL getFewPixels(int n, Sk4s xs, Sk4s ys, Sk4f* px0, Sk4f* px1, Sk4f* px2) { |
| Sk4i XIs = SkNx_cast<int, SkScalar>(xs); |
| Sk4i YIs = SkNx_cast<int, SkScalar>(ys); |
| Sk4i bufferLoc = YIs * fWidth + XIs; |
| switch (n) { |
| case 3: |
| *px2 = this->getPixelAt(bufferLoc[2]); |
| case 2: |
| *px1 = this->getPixelAt(bufferLoc[1]); |
| case 1: |
| *px0 = this->getPixelAt(bufferLoc[0]); |
| default: |
| break; |
| } |
| } |
| |
| void VECTORCALL get4Pixels(Sk4s xs, Sk4s ys, Sk4f* px0, Sk4f* px1, Sk4f* px2, Sk4f* px3) { |
| Sk4i XIs = SkNx_cast<int, SkScalar>(xs); |
| Sk4i YIs = SkNx_cast<int, SkScalar>(ys); |
| Sk4i bufferLoc = YIs * fWidth + XIs; |
| *px0 = this->getPixelAt(bufferLoc[0]); |
| *px1 = this->getPixelAt(bufferLoc[1]); |
| *px2 = this->getPixelAt(bufferLoc[2]); |
| *px3 = this->getPixelAt(bufferLoc[3]); |
| } |
| |
| void get4Pixels(const void* src, int index, Sk4f* px0, Sk4f* px1, Sk4f* px2, Sk4f* px3) { |
| *px0 = this->getPixelFromRow(src, index + 0); |
| *px1 = this->getPixelFromRow(src, index + 1); |
| *px2 = this->getPixelFromRow(src, index + 2); |
| *px3 = this->getPixelFromRow(src, index + 3); |
| } |
| |
| Sk4f getPixelFromRow(const void* row, int index) { |
| const Element* src = static_cast<const Element*>(row); |
| return fGetter.getPixelAt(src + index); |
| } |
| |
| Sk4f getPixelAt(int index) { |
| return this->getPixelFromRow(fSrc, index); |
| } |
| |
| const void* row(int y) const { return fSrc + y * fWidth[0]; } |
| |
| private: |
| const Element* const fSrc; |
| const Sk4i fWidth; |
| PixelGetter<colorType, colorProfile> fGetter; |
| }; |
| |
| // We're moving through source space at a rate of 1 source pixel per 1 dst pixel. |
| // We'll never re-use pixels, but we can at least load contiguous pixels. |
| template <typename Next, typename Strategy> |
| static void src_strategy_blend(Span span, Next* next, Strategy* strategy) { |
| SkPoint start; |
| SkScalar length; |
| int count; |
| std::tie(start, length, count) = span; |
| int ix = SkScalarFloorToInt(X(start)); |
| const void* row = strategy->row((int)std::floor(Y(start))); |
| if (length > 0) { |
| while (count >= 4) { |
| Sk4f px0, px1, px2, px3; |
| strategy->get4Pixels(row, ix, &px0, &px1, &px2, &px3); |
| next->blend4Pixels(px0, px1, px2, px3); |
| ix += 4; |
| count -= 4; |
| } |
| |
| while (count > 0) { |
| next->blendPixel(strategy->getPixelFromRow(row, ix)); |
| ix += 1; |
| count -= 1; |
| } |
| } else { |
| while (count >= 4) { |
| Sk4f px0, px1, px2, px3; |
| strategy->get4Pixels(row, ix - 3, &px3, &px2, &px1, &px0); |
| next->blend4Pixels(px0, px1, px2, px3); |
| ix -= 4; |
| count -= 4; |
| } |
| |
| while (count > 0) { |
| next->blendPixel(strategy->getPixelFromRow(row, ix)); |
| ix -= 1; |
| count -= 1; |
| } |
| } |
| } |
| |
| // NearestNeighborSampler - use nearest neighbor filtering to create runs of destination pixels. |
| template<SkColorType colorType, SkColorProfileType colorProfile, typename Next> |
| class NearestNeighborSampler : public SkLinearBitmapPipeline::SampleProcessorInterface { |
| public: |
| template<typename... Args> |
| NearestNeighborSampler(SkLinearBitmapPipeline::BlendProcessorInterface* next, Args&& ... args) |
| : fNext{next}, fStrategy{std::forward<Args>(args)...} { } |
| |
| NearestNeighborSampler(SkLinearBitmapPipeline::BlendProcessorInterface* next, |
| const NearestNeighborSampler& sampler) |
| : fNext{next}, fStrategy{sampler.fStrategy} { } |
| |
| void VECTORCALL pointListFew(int n, Sk4s xs, Sk4s ys) override { |
| SkASSERT(0 < n && n < 4); |
| Sk4f px0, px1, px2; |
| fStrategy.getFewPixels(n, xs, ys, &px0, &px1, &px2); |
| if (n >= 1) fNext->blendPixel(px0); |
| if (n >= 2) fNext->blendPixel(px1); |
| if (n >= 3) fNext->blendPixel(px2); |
| } |
| |
| void VECTORCALL pointList4(Sk4s xs, Sk4s ys) override { |
| Sk4f px0, px1, px2, px3; |
| fStrategy.get4Pixels(xs, ys, &px0, &px1, &px2, &px3); |
| fNext->blend4Pixels(px0, px1, px2, px3); |
| } |
| |
| void pointSpan(Span span) override { |
| SkASSERT(!span.isEmpty()); |
| SkPoint start; |
| SkScalar length; |
| int count; |
| std::tie(start, length, count) = span; |
| SkScalar absLength = SkScalarAbs(length); |
| if (absLength < (count - 1)) { |
| this->spanSlowRate(span); |
| } else if (absLength == (count - 1)) { |
| src_strategy_blend(span, fNext, &fStrategy); |
| } else { |
| this->spanFastRate(span); |
| } |
| } |
| |
| void repeatSpan(Span span, int32_t repeatCount) override { |
| while (repeatCount > 0) { |
| this->pointSpan(span); |
| repeatCount--; |
| } |
| } |
| |
| void VECTORCALL bilerpEdge(Sk4s xs, Sk4s ys) override { |
| SkFAIL("Using nearest neighbor sampler, but calling a bilerpEdge."); |
| } |
| |
| void bilerpSpan(Span span, SkScalar y) override { |
| SkFAIL("Using nearest neighbor sampler, but calling a bilerpSpan."); |
| } |
| |
| private: |
| // When moving through source space more slowly than dst space (zoomed in), |
| // we'll be sampling from the same source pixel more than once. |
| void spanSlowRate(Span span) { |
| SkPoint start; |
| SkScalar length; |
| int count; |
| std::tie(start, length, count) = span; |
| SkScalar x = X(start); |
| SkFixed fx = SkScalarToFixed(x); |
| SkScalar dx = length / (count - 1); |
| SkFixed fdx = SkScalarToFixed(dx); |
| |
| const void* row = fStrategy.row((int)std::floor(Y(start))); |
| Next* next = fNext; |
| |
| int ix = SkFixedFloorToInt(fx); |
| int prevIX = ix; |
| Sk4f fpixel = fStrategy.getPixelFromRow(row, ix); |
| |
| // When dx is less than one, each pixel is used more than once. Using the fixed point fx |
| // allows the code to quickly check that the same pixel is being used. The code uses this |
| // same pixel check to do the sRGB and normalization only once. |
| auto getNextPixel = [&]() { |
| if (ix != prevIX) { |
| fpixel = fStrategy.getPixelFromRow(row, ix); |
| prevIX = ix; |
| } |
| fx += fdx; |
| ix = SkFixedFloorToInt(fx); |
| return fpixel; |
| }; |
| |
| while (count >= 4) { |
| Sk4f px0 = getNextPixel(); |
| Sk4f px1 = getNextPixel(); |
| Sk4f px2 = getNextPixel(); |
| Sk4f px3 = getNextPixel(); |
| next->blend4Pixels(px0, px1, px2, px3); |
| count -= 4; |
| } |
| while (count > 0) { |
| next->blendPixel(getNextPixel()); |
| count -= 1; |
| } |
| } |
| |
| // We're moving through source space at a rate of 1 source pixel per 1 dst pixel. |
| // We'll never re-use pixels, but we can at least load contiguous pixels. |
| void spanUnitRate(Span span) { |
| src_strategy_blend(span, fNext, &fStrategy); |
| } |
| |
| // We're moving through source space faster than dst (zoomed out), |
| // so we'll never reuse a source pixel or be able to do contiguous loads. |
| void spanFastRate(Span span) { |
| span_fallback(span, this); |
| } |
| |
| Next* const fNext; |
| PixelAccessor<colorType, colorProfile> fStrategy; |
| }; |
| |
| // -- BilerpSampler -------------------------------------------------------------------------------- |
| // BilerpSampler - use a bilerp filter to create runs of destination pixels. |
| template<SkColorType colorType, SkColorProfileType colorProfile, typename Next> |
| class BilerpSampler : public SkLinearBitmapPipeline::SampleProcessorInterface { |
| public: |
| template<typename... Args> |
| BilerpSampler(SkLinearBitmapPipeline::BlendProcessorInterface* next, Args&& ... args) |
| : fNext{next}, fStrategy{std::forward<Args>(args)...} { } |
| |
| BilerpSampler(SkLinearBitmapPipeline::BlendProcessorInterface* next, |
| const BilerpSampler& sampler) |
| : fNext{next}, fStrategy{sampler.fStrategy} { } |
| |
| Sk4f bilerpNonEdgePixel(SkScalar x, SkScalar y) { |
| Sk4f px00, px10, px01, px11; |
| |
| // bilerp4() expects xs, ys are the top-lefts of the 2x2 kernel. |
| Sk4f xs = Sk4f{x} - 0.5f; |
| Sk4f ys = Sk4f{y} - 0.5f; |
| Sk4f sampleXs = xs + Sk4f{0.0f, 1.0f, 0.0f, 1.0f}; |
| Sk4f sampleYs = ys + Sk4f{0.0f, 0.0f, 1.0f, 1.0f}; |
| fStrategy.get4Pixels(sampleXs, sampleYs, &px00, &px10, &px01, &px11); |
| return bilerp4(xs, ys, px00, px10, px01, px11); |
| } |
| |
| void VECTORCALL pointListFew(int n, Sk4s xs, Sk4s ys) override { |
| SkASSERT(0 < n && n < 4); |
| auto bilerpPixel = [&](int index) { |
| return this->bilerpNonEdgePixel(xs[index], ys[index]); |
| }; |
| |
| if (n >= 1) fNext->blendPixel(bilerpPixel(0)); |
| if (n >= 2) fNext->blendPixel(bilerpPixel(1)); |
| if (n >= 3) fNext->blendPixel(bilerpPixel(2)); |
| } |
| |
| void VECTORCALL pointList4(Sk4s xs, Sk4s ys) override { |
| auto bilerpPixel = [&](int index) { |
| return this->bilerpNonEdgePixel(xs[index], ys[index]); |
| }; |
| fNext->blend4Pixels(bilerpPixel(0), bilerpPixel(1), bilerpPixel(2), bilerpPixel(3)); |
| } |
| |
| void pointSpan(Span span) override { |
| this->bilerpSpan(span, span.startY()); |
| } |
| |
| void repeatSpan(Span span, int32_t repeatCount) override { |
| while (repeatCount > 0) { |
| this->pointSpan(span); |
| repeatCount--; |
| } |
| } |
| |
| void VECTORCALL bilerpEdge(Sk4s sampleXs, Sk4s sampleYs) override { |
| Sk4f px00, px10, px01, px11; |
| Sk4f xs = Sk4f{sampleXs[0]}; |
| Sk4f ys = Sk4f{sampleYs[0]}; |
| fStrategy.get4Pixels(sampleXs, sampleYs, &px00, &px10, &px01, &px11); |
| Sk4f pixel = bilerp4(xs, ys, px00, px10, px01, px11); |
| fNext->blendPixel(pixel); |
| } |
| |
| void bilerpSpan(Span span, SkScalar y) override { |
| SkASSERT(!span.isEmpty()); |
| SkPoint start; |
| SkScalar length; |
| int count; |
| std::tie(start, length, count) = span; |
| SkScalar absLength = SkScalarAbs(length); |
| if (absLength == 0.0f) { |
| this->spanZeroRate(span, y); |
| } else if (absLength < (count - 1)) { |
| this->spanSlowRate(span, y); |
| } else if (absLength == (count - 1)) { |
| if (std::fmod(span.startX() - 0.5f, 1.0f) == 0.0f) { |
| if (std::fmod(span.startY() - 0.5f, 1.0f) == 0.0f) { |
| src_strategy_blend(span, fNext, &fStrategy); |
| } else { |
| this->spanUnitRateAlignedX(span, y); |
| } |
| } else { |
| this->spanUnitRate(span, y); |
| } |
| } else { |
| this->spanFastRate(span, y); |
| } |
| } |
| |
| private: |
| void spanZeroRate(Span span, SkScalar y1) { |
| SkScalar y0 = span.startY() - 0.5f; |
| y1 += 0.5f; |
| int iy0 = SkScalarFloorToInt(y0); |
| SkScalar filterY1 = y0 - iy0; |
| SkScalar filterY0 = 1.0f - filterY1; |
| int iy1 = SkScalarFloorToInt(y1); |
| int ix = SkScalarFloorToInt(span.startX()); |
| Sk4f pixelY0 = fStrategy.getPixelFromRow(fStrategy.row(iy0), ix); |
| Sk4f pixelY1 = fStrategy.getPixelFromRow(fStrategy.row(iy1), ix); |
| Sk4f filterPixel = pixelY0 * filterY0 + pixelY1 * filterY1; |
| int count = span.count(); |
| while (count >= 4) { |
| fNext->blend4Pixels(filterPixel, filterPixel, filterPixel, filterPixel); |
| count -= 4; |
| } |
| while (count > 0) { |
| fNext->blendPixel(filterPixel); |
| count -= 1; |
| } |
| } |
| |
| // When moving through source space more slowly than dst space (zoomed in), |
| // we'll be sampling from the same source pixel more than once. |
| void spanSlowRate(Span span, SkScalar ry1) { |
| SkPoint start; |
| SkScalar length; |
| int count; |
| std::tie(start, length, count) = span; |
| SkFixed fx = SkScalarToFixed(X(start)-0.5f); |
| |
| SkFixed fdx = SkScalarToFixed(length / (count - 1)); |
| |
| Sk4f xAdjust; |
| if (fdx >= 0) { |
| xAdjust = Sk4f{-1.0f}; |
| } else { |
| xAdjust = Sk4f{1.0f}; |
| } |
| int ix = SkFixedFloorToInt(fx); |
| int ioldx = ix; |
| Sk4f x{SkFixedToScalar(fx) - ix}; |
| Sk4f dx{SkFixedToScalar(fdx)}; |
| SkScalar ry0 = Y(start) - 0.5f; |
| ry1 += 0.5f; |
| SkScalar yFloor = std::floor(ry0); |
| Sk4f y1 = Sk4f{ry0 - yFloor}; |
| Sk4f y0 = Sk4f{1.0f} - y1; |
| const void* const row0 = fStrategy.row(SkScalarFloorToInt(ry0)); |
| const void* const row1 = fStrategy.row(SkScalarFloorToInt(ry1)); |
| Sk4f fpixel00 = y0 * fStrategy.getPixelFromRow(row0, ix); |
| Sk4f fpixel01 = y1 * fStrategy.getPixelFromRow(row1, ix); |
| Sk4f fpixel10 = y0 * fStrategy.getPixelFromRow(row0, ix + 1); |
| Sk4f fpixel11 = y1 * fStrategy.getPixelFromRow(row1, ix + 1); |
| auto getNextPixel = [&]() { |
| if (ix != ioldx) { |
| fpixel00 = fpixel10; |
| fpixel01 = fpixel11; |
| fpixel10 = y0 * fStrategy.getPixelFromRow(row0, ix + 1); |
| fpixel11 = y1 * fStrategy.getPixelFromRow(row1, ix + 1); |
| ioldx = ix; |
| x = x + xAdjust; |
| } |
| |
| Sk4f x0, x1; |
| x0 = Sk4f{1.0f} - x; |
| x1 = x; |
| Sk4f fpixel = x0 * (fpixel00 + fpixel01) + x1 * (fpixel10 + fpixel11); |
| fx += fdx; |
| ix = SkFixedFloorToInt(fx); |
| x = x + dx; |
| return fpixel; |
| }; |
| |
| while (count >= 4) { |
| Sk4f fpixel0 = getNextPixel(); |
| Sk4f fpixel1 = getNextPixel(); |
| Sk4f fpixel2 = getNextPixel(); |
| Sk4f fpixel3 = getNextPixel(); |
| |
| fNext->blend4Pixels(fpixel0, fpixel1, fpixel2, fpixel3); |
| count -= 4; |
| } |
| |
| while (count > 0) { |
| fNext->blendPixel(getNextPixel()); |
| |
| count -= 1; |
| } |
| } |
| |
| // We're moving through source space at a rate of 1 source pixel per 1 dst pixel. |
| // We'll never re-use pixels, but we can at least load contiguous pixels. |
| void spanUnitRate(Span span, SkScalar y1) { |
| y1 += 0.5f; |
| SkScalar y0 = span.startY() - 0.5f; |
| int iy0 = SkScalarFloorToInt(y0); |
| SkScalar filterY1 = y0 - iy0; |
| SkScalar filterY0 = 1.0f - filterY1; |
| int iy1 = SkScalarFloorToInt(y1); |
| const void* rowY0 = fStrategy.row(iy0); |
| const void* rowY1 = fStrategy.row(iy1); |
| SkScalar x0 = span.startX() - 0.5f; |
| int ix0 = SkScalarFloorToInt(x0); |
| SkScalar filterX1 = x0 - ix0; |
| SkScalar filterX0 = 1.0f - filterX1; |
| |
| auto getPixelY0 = [&]() { |
| Sk4f px = fStrategy.getPixelFromRow(rowY0, ix0); |
| return px * filterY0; |
| }; |
| |
| auto getPixelY1 = [&]() { |
| Sk4f px = fStrategy.getPixelFromRow(rowY1, ix0); |
| return px * filterY1; |
| }; |
| |
| auto get4PixelsY0 = [&](int ix, Sk4f* px0, Sk4f* px1, Sk4f* px2, Sk4f* px3) { |
| fStrategy.get4Pixels(rowY0, ix, px0, px1, px2, px3); |
| *px0 = *px0 * filterY0; |
| *px1 = *px1 * filterY0; |
| *px2 = *px2 * filterY0; |
| *px3 = *px3 * filterY0; |
| }; |
| |
| auto get4PixelsY1 = [&](int ix, Sk4f* px0, Sk4f* px1, Sk4f* px2, Sk4f* px3) { |
| fStrategy.get4Pixels(rowY1, ix, px0, px1, px2, px3); |
| *px0 = *px0 * filterY1; |
| *px1 = *px1 * filterY1; |
| *px2 = *px2 * filterY1; |
| *px3 = *px3 * filterY1; |
| }; |
| |
| auto lerp = [&](Sk4f& pixelX0, Sk4f& pixelX1) { |
| return pixelX0 * filterX0 + pixelX1 * filterX1; |
| }; |
| |
| // Mid making 4 unit rate. |
| Sk4f pxB = getPixelY0() + getPixelY1(); |
| if (span.length() > 0) { |
| int count = span.count(); |
| while (count >= 4) { |
| Sk4f px00, px10, px20, px30; |
| get4PixelsY0(ix0, &px00, &px10, &px20, &px30); |
| Sk4f px01, px11, px21, px31; |
| get4PixelsY1(ix0, &px01, &px11, &px21, &px31); |
| Sk4f pxS0 = px00 + px01; |
| Sk4f px0 = lerp(pxB, pxS0); |
| Sk4f pxS1 = px10 + px11; |
| Sk4f px1 = lerp(pxS0, pxS1); |
| Sk4f pxS2 = px20 + px21; |
| Sk4f px2 = lerp(pxS1, pxS2); |
| Sk4f pxS3 = px30 + px31; |
| Sk4f px3 = lerp(pxS2, pxS3); |
| pxB = pxS3; |
| fNext->blend4Pixels(px0, px1, px2, px3); |
| ix0 += 4; |
| count -= 4; |
| } |
| while (count > 0) { |
| Sk4f pixelY0 = fStrategy.getPixelFromRow(rowY0, ix0); |
| Sk4f pixelY1 = fStrategy.getPixelFromRow(rowY1, ix0); |
| |
| fNext->blendPixel(lerp(pixelY0, pixelY1)); |
| ix0 += 1; |
| count -= 1; |
| } |
| } else { |
| int count = span.count(); |
| while (count >= 4) { |
| Sk4f px00, px10, px20, px30; |
| get4PixelsY0(ix0 - 3, &px00, &px10, &px20, &px30); |
| Sk4f px01, px11, px21, px31; |
| get4PixelsY1(ix0 - 3, &px01, &px11, &px21, &px31); |
| Sk4f pxS3 = px30 + px31; |
| Sk4f px0 = lerp(pxS3, pxB); |
| Sk4f pxS2 = px20 + px21; |
| Sk4f px1 = lerp(pxS2, pxS3); |
| Sk4f pxS1 = px10 + px11; |
| Sk4f px2 = lerp(pxS1, pxS2); |
| Sk4f pxS0 = px00 + px01; |
| Sk4f px3 = lerp(pxS0, pxS1); |
| pxB = pxS0; |
| fNext->blend4Pixels(px0, px1, px2, px3); |
| ix0 -= 4; |
| count -= 4; |
| } |
| while (count > 0) { |
| Sk4f pixelY0 = fStrategy.getPixelFromRow(rowY0, ix0); |
| Sk4f pixelY1 = fStrategy.getPixelFromRow(rowY1, ix0); |
| |
| fNext->blendPixel(lerp(pixelY0, pixelY1)); |
| ix0 -= 1; |
| count -= 1; |
| } |
| } |
| } |
| |
| void spanUnitRateAlignedX(Span span, SkScalar y1) { |
| SkScalar y0 = span.startY() - 0.5f; |
| y1 += 0.5f; |
| int iy0 = SkScalarFloorToInt(y0); |
| SkScalar filterY1 = y0 - iy0; |
| SkScalar filterY0 = 1.0f - filterY1; |
| int iy1 = SkScalarFloorToInt(y1); |
| int ix = SkScalarFloorToInt(span.startX()); |
| const void* rowY0 = fStrategy.row(iy0); |
| const void* rowY1 = fStrategy.row(iy1); |
| auto lerp = [&](Sk4f* pixelY0, Sk4f* pixelY1) { |
| return *pixelY0 * filterY0 + *pixelY1 * filterY1; |
| }; |
| |
| if (span.length() > 0) { |
| int count = span.count(); |
| while (count >= 4) { |
| Sk4f px00, px10, px20, px30; |
| fStrategy.get4Pixels(rowY0, ix, &px00, &px10, &px20, &px30); |
| Sk4f px01, px11, px21, px31; |
| fStrategy.get4Pixels(rowY1, ix, &px01, &px11, &px21, &px31); |
| fNext->blend4Pixels( |
| lerp(&px00, &px01), lerp(&px10, &px11), lerp(&px20, &px21), lerp(&px30, &px31)); |
| ix += 4; |
| count -= 4; |
| } |
| while (count > 0) { |
| Sk4f pixelY0 = fStrategy.getPixelFromRow(rowY0, ix); |
| Sk4f pixelY1 = fStrategy.getPixelFromRow(rowY1, ix); |
| |
| fNext->blendPixel(lerp(&pixelY0, &pixelY1)); |
| ix += 1; |
| count -= 1; |
| } |
| } else { |
| int count = span.count(); |
| while (count >= 4) { |
| Sk4f px00, px10, px20, px30; |
| fStrategy.get4Pixels(rowY0, ix - 3, &px30, &px20, &px10, &px00); |
| Sk4f px01, px11, px21, px31; |
| fStrategy.get4Pixels(rowY1, ix - 3, &px31, &px21, &px11, &px01); |
| fNext->blend4Pixels( |
| lerp(&px00, &px01), lerp(&px10, &px11), lerp(&px20, &px21), lerp(&px30, &px31)); |
| ix -= 4; |
| count -= 4; |
| } |
| while (count > 0) { |
| Sk4f pixelY0 = fStrategy.getPixelFromRow(rowY0, ix); |
| Sk4f pixelY1 = fStrategy.getPixelFromRow(rowY1, ix); |
| |
| fNext->blendPixel(lerp(&pixelY0, &pixelY1)); |
| ix -= 1; |
| count -= 1; |
| } |
| } |
| } |
| |
| // We're moving through source space faster than dst (zoomed out), |
| // so we'll never reuse a source pixel or be able to do contiguous loads. |
| void spanFastRate(Span span, SkScalar y1) { |
| SkPoint start; |
| SkScalar length; |
| int count; |
| std::tie(start, length, count) = span; |
| SkScalar x = X(start); |
| SkScalar y = Y(start); |
| |
| // In this sampler, it is assumed that if span.StartY() and y1 are the same then both |
| // y-lines are on the same tile. |
| if (y == y1) { |
| // Both y-lines are on the same tile. |
| span_fallback(span, this); |
| } else { |
| // The y-lines are on different tiles. |
| SkScalar dx = length / (count - 1); |
| Sk4f ys = {y - 0.5f, y - 0.5f, y1 + 0.5f, y1 + 0.5f}; |
| while (count > 0) { |
| Sk4f xs = Sk4f{-0.5f, 0.5f, -0.5f, 0.5f} + Sk4f{x}; |
| this->bilerpEdge(xs, ys); |
| x += dx; |
| count -= 1; |
| } |
| } |
| } |
| |
| Next* const fNext; |
| PixelAccessor<colorType, colorProfile> fStrategy; |
| }; |
| |
| } // namespace |
| |
| #endif // SkLinearBitmapPipeline_sampler_DEFINED |
