diff options
Diffstat (limited to 'src/core')
-rw-r--r-- | src/core/SkBitmapFilter.cpp | 2 | ||||
-rw-r--r-- | src/core/SkBitmapFilter.h | 95 | ||||
-rw-r--r-- | src/core/SkBitmapScaler.cpp | 113 | ||||
-rw-r--r-- | src/core/SkConvolver.cpp | 25 | ||||
-rw-r--r-- | src/core/SkConvolver.h | 21 |
5 files changed, 181 insertions, 75 deletions
diff --git a/src/core/SkBitmapFilter.cpp b/src/core/SkBitmapFilter.cpp index 55a7092ba7..d96a385405 100644 --- a/src/core/SkBitmapFilter.cpp +++ b/src/core/SkBitmapFilter.cpp @@ -20,7 +20,7 @@ SK_CONF_DECLARE(const char *, c_bitmapFilter, "bitmap.filter", "mitchell", "Whic SkBitmapFilter *SkBitmapFilter::Allocate() { if (!strcmp(c_bitmapFilter, "mitchell")) { - return new SkMitchellFilter(1.f / 3.f, 1.f / 3.f); + return new SkMitchellFilter; } else if (!strcmp(c_bitmapFilter, "lanczos")) { return new SkLanczosFilter; } else if (!strcmp(c_bitmapFilter, "hamming")) { diff --git a/src/core/SkBitmapFilter.h b/src/core/SkBitmapFilter.h index eb327d716c..038ee98eae 100644 --- a/src/core/SkBitmapFilter.h +++ b/src/core/SkBitmapFilter.h @@ -12,6 +12,10 @@ #include "SkMath.h" #include "SkScalar.h" +#ifndef SK_SUPPORT_LEGACY_BITMAP_FILTER +#include "SkNx.h" +#endif + // size of the precomputed bitmap filter tables for high quality filtering. // Used to precompute the shape of the filter kernel. // Table size chosen from experiments to see where I could start to see a difference. @@ -47,6 +51,20 @@ class SkBitmapFilter { float width() const { return fWidth; } float invWidth() const { return fInvWidth; } virtual float evaluate(float x) const = 0; + +#ifndef SK_SUPPORT_LEGACY_BITMAP_FILTER + virtual float evaluate_n(float val, float diff, int count, float* output) const { + float sum = 0; + for (int index = 0; index < count; index++) { + float filterValue = evaluate(val); + *output++ = filterValue; + sum += filterValue; + val += diff; + } + return sum; + } +#endif + virtual ~SkBitmapFilter() {} static SkBitmapFilter* Allocate(); @@ -73,27 +91,98 @@ class SkBitmapFilter { } }; -class SkMitchellFilter: public SkBitmapFilter { +class SkMitchellFilter : public SkBitmapFilter { public: - SkMitchellFilter(float b, float c, float width=2.0f) - : SkBitmapFilter(width), B(b), C(c) { +#ifdef SK_SUPPORT_LEGACY_BITMAP_FILTER + SkMitchellFilter() + : INHERITED(2), B(1.f / 3), C(1.f / 3) { + } +#else + SkMitchellFilter() + : INHERITED(2) + , fB(1.f / 3.f) + , fC(1.f / 3.f) + , fA1(-fB - 6*fC) + , fB1(6*fB + 30*fC) + , fC1(-12*fB - 48*fC) + , fD1(8*fB + 24*fC) + , fA2(12 - 9*fB - 6*fC) + , fB2(-18 + 12*fB + 6*fC) + , fD2(6 - 2*fB) { } +#endif float evaluate(float x) const override { x = fabsf(x); if (x > 2.f) { return 0; } else if (x > 1.f) { +#ifdef SK_SUPPORT_LEGACY_BITMAP_FILTER return ((-B - 6*C) * x*x*x + (6*B + 30*C) * x*x + (-12*B - 48*C) * x + (8*B + 24*C)) * (1.f/6.f); +#else + return (((fA1 * x + fB1) * x + fC1) * x + fD1) * (1.f/6.f); +#endif } else { +#ifdef SK_SUPPORT_LEGACY_BITMAP_FILTER return ((12 - 9*B - 6*C) * x*x*x + (-18 + 12*B + 6*C) * x*x + (6 - 2*B)) * (1.f/6.f); +#else + return ((fA2 * x + fB2) * x*x + fD2) * (1.f/6.f); +#endif } } + +#ifndef SK_SUPPORT_LEGACY_BITMAP_FILTER + // TODO : native Sk4f abs + static Sk4f abs(const Sk4f& x) { + Sk4f neg = x < Sk4f(0); + return neg.thenElse(Sk4f(0) - x, x); + } + + Sk4f evalcore_n(const Sk4f& val) const { + Sk4f x = abs(val); + Sk4f over2 = x > Sk4f(2); + Sk4f over1 = x > Sk4f(1); + Sk4f poly1 = (((Sk4f(fA1) * x + Sk4f(fB1)) * x + Sk4f(fC1)) * x + Sk4f(fD1)) + * Sk4f(1.f/6.f); + Sk4f poly0 = ((Sk4f(fA2) * x + Sk4f(fB2)) * x*x + Sk4f(fD2)) * Sk4f(1.f/6.f); + return over2.thenElse(Sk4f(0), over1.thenElse(poly1, poly0)); + } + + float evaluate_n(float val, float diff, int count, float* output) const override { + Sk4f sum(0); + while (count >= 4) { + float v0 = val; + float v1 = val += diff; + float v2 = val += diff; + float v3 = val += diff; + val += diff; + Sk4f filterValue = evalcore_n(Sk4f(v0, v1, v2, v3)); + filterValue.store(output); + output += 4; + sum = sum + filterValue; + count -= 4; + } + float sums[4]; + sum.store(sums); + float result = sums[0] + sums[1] + sums[2] + sums[3]; + result += INHERITED::evaluate_n(val, diff, count, output); + return result; + } +#endif + protected: +#ifdef SK_SUPPORT_LEGACY_BITMAP_FILTER float B, C; +#else + float fB, fC; + float fA1, fB1, fC1, fD1; + float fA2, fB2, fD2; +#endif + private: + typedef SkBitmapFilter INHERITED; }; class SkGaussianFilter: public SkBitmapFilter { diff --git a/src/core/SkBitmapScaler.cpp b/src/core/SkBitmapScaler.cpp index 965955a2dc..44ed83c8a2 100644 --- a/src/core/SkBitmapScaler.cpp +++ b/src/core/SkBitmapScaler.cpp @@ -11,7 +11,6 @@ #include "SkImageInfo.h" #include "SkPixmap.h" #include "SkRect.h" -#include "SkScalar.h" #include "SkTArray.h" // SkResizeFilter ---------------------------------------------------------------- @@ -74,7 +73,7 @@ SkResizeFilter::SkResizeFilter(SkBitmapScaler::ResizeMethod method, fBitmapFilter = new SkTriangleFilter; break; case SkBitmapScaler::RESIZE_MITCHELL: - fBitmapFilter = new SkMitchellFilter(1.f / 3.f, 1.f / 3.f); + fBitmapFilter = new SkMitchellFilter; break; case SkBitmapScaler::RESIZE_HAMMING: fBitmapFilter = new SkHammingFilter; @@ -130,45 +129,65 @@ void SkResizeFilter::computeFilters(int srcSize, // to support the filtering function. float srcSupport = fBitmapFilter->width() / clampedScale; - // Speed up the divisions below by turning them into multiplies. float invScale = 1.0f / scale; - SkTArray<float> filterValues(64); - SkTArray<short> fixedFilterValues(64); + SkSTArray<64, float, true> filterValuesArray; + SkSTArray<64, SkConvolutionFilter1D::ConvolutionFixed, true> fixedFilterValuesArray; // Loop over all pixels in the output range. We will generate one set of // filter values for each one. Those values will tell us how to blend the // source pixels to compute the destination pixel. - for (int destSubsetI = SkScalarFloorToInt(destSubsetLo); destSubsetI < SkScalarCeilToInt(destSubsetHi); - destSubsetI++) { - // Reset the arrays. We don't declare them inside so they can re-use the - // same malloc-ed buffer. - filterValues.reset(); - fixedFilterValues.reset(); - - // This is the pixel in the source directly under the pixel in the dest. - // Note that we base computations on the "center" of the pixels. To see - // why, observe that the destination pixel at coordinates (0, 0) in a 5.0x - // downscale should "cover" the pixels around the pixel with *its center* - // at coordinates (2.5, 2.5) in the source, not those around (0, 0). - // Hence we need to scale coordinates (0.5, 0.5), not (0, 0). - float srcPixel = (static_cast<float>(destSubsetI) + 0.5f) * invScale; + // This is the pixel in the source directly under the pixel in the dest. + // Note that we base computations on the "center" of the pixels. To see + // why, observe that the destination pixel at coordinates (0, 0) in a 5.0x + // downscale should "cover" the pixels around the pixel with *its center* + // at coordinates (2.5, 2.5) in the source, not those around (0, 0). + // Hence we need to scale coordinates (0.5, 0.5), not (0, 0). +#ifdef SK_SUPPORT_LEGACY_BITMAP_FILTER + int destLimit = SkScalarTruncToInt(SkScalarCeilToScalar(destSubsetHi) + - SkScalarFloorToScalar(destSubsetLo)); +#else + destSubsetLo = SkScalarFloorToScalar(destSubsetLo); + destSubsetHi = SkScalarCeilToScalar(destSubsetHi); + float srcPixel = (destSubsetLo + 0.5f) * invScale; + int destLimit = SkScalarTruncToInt(destSubsetHi - destSubsetLo); +#endif + output->reserveAdditional(destLimit, SkScalarCeilToInt(destLimit * srcSupport * 2)); +#ifdef SK_SUPPORT_LEGACY_BITMAP_FILTER + for (int destSubsetI = SkScalarFloorToInt(destSubsetLo); destSubsetI < SkScalarCeilToInt(destSubsetHi); + destSubsetI++) +#else + for (int destI = 0; destI < destLimit; srcPixel += invScale, destI++) +#endif + { // Compute the (inclusive) range of source pixels the filter covers. +#ifdef SK_SUPPORT_LEGACY_BITMAP_FILTER + float srcPixel = (static_cast<float>(destSubsetI) + 0.5f) * invScale; int srcBegin = SkTMax(0, SkScalarFloorToInt(srcPixel - srcSupport)); int srcEnd = SkTMin(srcSize - 1, SkScalarCeilToInt(srcPixel + srcSupport)); +#else + float srcBegin = SkTMax(0.f, SkScalarFloorToScalar(srcPixel - srcSupport)); + float srcEnd = SkTMin(srcSize - 1.f, SkScalarCeilToScalar(srcPixel + srcSupport)); +#endif // Compute the unnormalized filter value at each location of the source // it covers. +#ifdef SK_SUPPORT_LEGACY_BITMAP_FILTER float filterSum = 0.0f; // Sub of the filter values for normalizing. + int filterCount = srcEnd - srcBegin + 1; + filterValuesArray.reset(filterCount); for (int curFilterPixel = srcBegin; curFilterPixel <= srcEnd; curFilterPixel++) { - // Distance from the center of the filter, this is the filter coordinate - // in source space. We also need to consider the center of the pixel - // when comparing distance against 'srcPixel'. In the 5x downscale - // example used above the distance from the center of the filter to - // the pixel with coordinates (2, 2) should be 0, because its center - // is at (2.5, 2.5). +#endif + // Sum of the filter values for normalizing. + // Distance from the center of the filter, this is the filter coordinate + // in source space. We also need to consider the center of the pixel + // when comparing distance against 'srcPixel'. In the 5x downscale + // example used above the distance from the center of the filter to + // the pixel with coordinates (2, 2) should be 0, because its center + // is at (2.5, 2.5). +#ifdef SK_SUPPORT_LEGACY_BITMAP_FILTER float srcFilterDist = ((static_cast<float>(curFilterPixel) + 0.5f) - srcPixel); @@ -177,36 +196,56 @@ void SkResizeFilter::computeFilters(int srcSize, // Compute the filter value at that location. float filterValue = fBitmapFilter->evaluate(destFilterDist); - filterValues.push_back(filterValue); + filterValuesArray[curFilterPixel - srcBegin] = filterValue; filterSum += filterValue; } - SkASSERT(!filterValues.empty()); - +#else + float destFilterDist = (srcBegin + 0.5f - srcPixel) * clampedScale; + int filterCount = SkScalarTruncToInt(srcEnd - srcBegin) + 1; + SkASSERT(filterCount > 0); + filterValuesArray.reset(filterCount); + float filterSum = fBitmapFilter->evaluate_n(destFilterDist, clampedScale, filterCount, + filterValuesArray.begin()); +#endif // The filter must be normalized so that we don't affect the brightness of // the image. Convert to normalized fixed point. - short fixedSum = 0; - for (int i = 0; i < filterValues.count(); i++) { - short curFixed = output->FloatToFixed(filterValues[i] / filterSum); + int fixedSum = 0; + fixedFilterValuesArray.reset(filterCount); + const float* filterValues = filterValuesArray.begin(); + SkConvolutionFilter1D::ConvolutionFixed* fixedFilterValues = fixedFilterValuesArray.begin(); +#ifndef SK_SUPPORT_LEGACY_BITMAP_FILTER + float invFilterSum = 1 / filterSum; +#endif + for (int fixedI = 0; fixedI < filterCount; fixedI++) { +#ifdef SK_SUPPORT_LEGACY_BITMAP_FILTER + int curFixed = SkConvolutionFilter1D::FloatToFixed(filterValues[fixedI] / filterSum); +#else + int curFixed = SkConvolutionFilter1D::FloatToFixed(filterValues[fixedI] * invFilterSum); +#endif fixedSum += curFixed; - fixedFilterValues.push_back(curFixed); + fixedFilterValues[fixedI] = SkToS16(curFixed); } + SkASSERT(fixedSum <= 0x7FFF); // The conversion to fixed point will leave some rounding errors, which // we add back in to avoid affecting the brightness of the image. We // arbitrarily add this to the center of the filter array (this won't always // be the center of the filter function since it could get clipped on the // edges, but it doesn't matter enough to worry about that case). - short leftovers = output->FloatToFixed(1.0f) - fixedSum; - fixedFilterValues[fixedFilterValues.count() / 2] += leftovers; + int leftovers = SkConvolutionFilter1D::FloatToFixed(1) - fixedSum; + fixedFilterValues[filterCount / 2] += leftovers; // Now it's ready to go. - output->AddFilter(srcBegin, &fixedFilterValues[0], - static_cast<int>(fixedFilterValues.count())); +#ifdef SK_SUPPORT_LEGACY_BITMAP_FILTER + output->AddFilter(srcBegin, fixedFilterValues, filterCount); +#else + output->AddFilter(SkScalarFloorToInt(srcBegin), fixedFilterValues, filterCount); +#endif } if (convolveProcs.fApplySIMDPadding) { - convolveProcs.fApplySIMDPadding( output ); + convolveProcs.fApplySIMDPadding(output); } } diff --git a/src/core/SkConvolver.cpp b/src/core/SkConvolver.cpp index 28d3ab139c..c662e2ddaf 100644 --- a/src/core/SkConvolver.cpp +++ b/src/core/SkConvolver.cpp @@ -3,9 +3,7 @@ // found in the LICENSE file. #include "SkConvolver.h" -#include "SkMath.h" -#include "SkSize.h" -#include "SkTypes.h" +#include "SkTArray.h" namespace { @@ -285,21 +283,6 @@ SkConvolutionFilter1D::~SkConvolutionFilter1D() { } void SkConvolutionFilter1D::AddFilter(int filterOffset, - const float* filterValues, - int filterLength) { - SkASSERT(filterLength > 0); - - SkTArray<ConvolutionFixed> fixedValues; - fixedValues.reset(filterLength); - - for (int i = 0; i < filterLength; ++i) { - fixedValues.push_back(FloatToFixed(filterValues[i])); - } - - AddFilter(filterOffset, &fixedValues[0], filterLength); -} - -void SkConvolutionFilter1D::AddFilter(int filterOffset, const ConvolutionFixed* filterValues, int filterLength) { // It is common for leading/trailing filter values to be zeros. In such @@ -323,9 +306,7 @@ void SkConvolutionFilter1D::AddFilter(int filterOffset, filterLength = lastNonZero + 1 - firstNonZero; SkASSERT(filterLength > 0); - for (int i = firstNonZero; i <= lastNonZero; i++) { - fFilterValues.push_back(filterValues[i]); - } + fFilterValues.append(filterLength, &filterValues[firstNonZero]); } else { // Here all the factors were zeroes. filterLength = 0; @@ -339,7 +320,7 @@ void SkConvolutionFilter1D::AddFilter(int filterOffset, instance.fOffset = filterOffset; instance.fTrimmedLength = filterLength; instance.fLength = filterSize; - fFilters.push_back(instance); + fFilters.push(instance); fMaxFilter = SkTMax(fMaxFilter, filterLength); } diff --git a/src/core/SkConvolver.h b/src/core/SkConvolver.h index 00305fa9fa..4e23f6cc17 100644 --- a/src/core/SkConvolver.h +++ b/src/core/SkConvolver.h @@ -6,8 +6,7 @@ #define SK_CONVOLVER_H #include "SkSize.h" -#include "SkTypes.h" -#include "SkTArray.h" +#include "SkTDArray.h" // avoid confusion with Mac OS X's math library (Carbon) #if defined(__APPLE__) @@ -58,6 +57,11 @@ public: // output image. int numValues() const { return static_cast<int>(fFilters.count()); } + void reserveAdditional(int filterCount, int filterValueCount) { + fFilters.setReserve(fFilters.count() + filterCount); + fFilterValues.setReserve(fFilterValues.count() + filterValueCount); + } + // Appends the given list of scaling values for generating a given output // pixel. |filterOffset| is the distance from the edge of the image to where // the scaling factors start. The scaling factors apply to the source pixels @@ -68,13 +72,6 @@ public: // brighness of the image. // // The filterLength must be > 0. - // - // This version will automatically convert your input to ConvolutionFixed point. - SK_API void AddFilter(int filterOffset, - const float* filterValues, - int filterLength); - - // Same as the above version, but the input is already ConvolutionFixed point. void AddFilter(int filterOffset, const ConvolutionFixed* filterValues, int filterLength); @@ -112,7 +109,7 @@ public: // SIMD padding which happens outside of this class. void addFilterValue( ConvolutionFixed val ) { - fFilterValues.push_back( val ); + fFilterValues.push( val ); } private: struct FilterInstance { @@ -132,12 +129,12 @@ private: }; // Stores the information for each filter added to this class. - SkTArray<FilterInstance> fFilters; + SkTDArray<FilterInstance> fFilters; // We store all the filter values in this flat list, indexed by // |FilterInstance.data_location| to avoid the mallocs required for storing // each one separately. - SkTArray<ConvolutionFixed> fFilterValues; + SkTDArray<ConvolutionFixed> fFilterValues; // The maximum size of any filter we've added. int fMaxFilter; |