senorblanco@chromium.org | 5faa2dc | 2012-09-18 20:32:34 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2012 The Android Open Source Project |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
| 8 | #include "SkMatrixConvolutionImageFilter.h" |
| 9 | #include "SkBitmap.h" |
| 10 | #include "SkColorPriv.h" |
| 11 | #include "SkFlattenableBuffers.h" |
| 12 | #include "SkRect.h" |
| 13 | |
| 14 | SkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter(const SkISize& kernelSize, const SkScalar* kernel, SkScalar gain, SkScalar bias, const SkIPoint& target, TileMode tileMode, SkImageFilter* input) |
| 15 | : INHERITED(input), |
| 16 | fKernelSize(kernelSize), |
| 17 | fGain(gain), |
| 18 | fBias(bias), |
| 19 | fTarget(target), |
| 20 | fTileMode(tileMode) { |
| 21 | uint32_t size = fKernelSize.fWidth * fKernelSize.fHeight; |
| 22 | fKernel = SkNEW_ARRAY(SkScalar, size); |
| 23 | memcpy(fKernel, kernel, size * sizeof(SkScalar)); |
| 24 | SkASSERT(target.fX >= 0 && target.fX < kernelSize.fWidth); |
| 25 | SkASSERT(target.fY >= 0 && target.fY < kernelSize.fHeight); |
| 26 | } |
| 27 | |
| 28 | SkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) { |
| 29 | fKernelSize.fWidth = buffer.readInt(); |
| 30 | fKernelSize.fHeight = buffer.readInt(); |
| 31 | uint32_t size = fKernelSize.fWidth * fKernelSize.fHeight; |
| 32 | fKernel = SkNEW_ARRAY(SkScalar, size); |
| 33 | uint32_t readSize = buffer.readScalarArray(fKernel); |
| 34 | SkASSERT(readSize == size); |
| 35 | fGain = buffer.readScalar(); |
| 36 | fBias = buffer.readScalar(); |
| 37 | fTarget.fX = buffer.readScalar(); |
| 38 | fTarget.fY = buffer.readScalar(); |
| 39 | fTileMode = (TileMode) buffer.readInt(); |
| 40 | } |
| 41 | |
| 42 | void SkMatrixConvolutionImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const { |
| 43 | this->INHERITED::flatten(buffer); |
| 44 | buffer.writeInt(fKernelSize.fWidth); |
| 45 | buffer.writeInt(fKernelSize.fHeight); |
| 46 | buffer.writeScalarArray(fKernel, fKernelSize.fWidth * fKernelSize.fHeight); |
| 47 | buffer.writeScalar(fGain); |
| 48 | buffer.writeScalar(fBias); |
| 49 | buffer.writeScalar(fTarget.fX); |
| 50 | buffer.writeScalar(fTarget.fY); |
| 51 | buffer.writeInt((int) fTileMode); |
| 52 | } |
| 53 | |
| 54 | SkMatrixConvolutionImageFilter::~SkMatrixConvolutionImageFilter() { |
| 55 | delete[] fKernel; |
| 56 | } |
| 57 | |
| 58 | class UncheckedPixelFetcher { |
| 59 | public: |
| 60 | static inline SkPMColor fetch(const SkBitmap& src, int x, int y) { |
| 61 | return *src.getAddr32(x, y); |
| 62 | } |
| 63 | }; |
| 64 | |
| 65 | class ClampPixelFetcher { |
| 66 | public: |
| 67 | static inline SkPMColor fetch(const SkBitmap& src, int x, int y) { |
| 68 | x = SkClampMax(x, src.width() - 1); |
| 69 | y = SkClampMax(y, src.height() - 1); |
| 70 | return *src.getAddr32(x, y); |
| 71 | } |
| 72 | }; |
| 73 | |
| 74 | class RepeatPixelFetcher { |
| 75 | public: |
| 76 | static inline SkPMColor fetch(const SkBitmap& src, int x, int y) { |
| 77 | x %= src.width(); |
| 78 | y %= src.height(); |
| 79 | if (x < 0) { |
| 80 | x += src.width(); |
| 81 | } |
| 82 | if (y < 0) { |
| 83 | y += src.height(); |
| 84 | } |
| 85 | return *src.getAddr32(x, y); |
| 86 | } |
| 87 | }; |
| 88 | |
| 89 | class ClampToBlackPixelFetcher { |
| 90 | public: |
| 91 | static inline SkPMColor fetch(const SkBitmap& src, int x, int y) { |
| 92 | if (x < 0 || x >= src.width() || y < 0 || y >= src.height()) { |
| 93 | return 0; |
| 94 | } else { |
| 95 | return *src.getAddr32(x, y); |
| 96 | } |
| 97 | } |
| 98 | }; |
| 99 | |
| 100 | template<class PixelFetcher> |
| 101 | void SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) { |
| 102 | for (int y = rect.fTop; y < rect.fBottom; ++y) { |
| 103 | SkPMColor* dptr = result->getAddr32(rect.fLeft, y); |
| 104 | for (int x = rect.fLeft; x < rect.fRight; ++x) { |
| 105 | SkScalar sumA = 0, sumR = 0, sumG = 0, sumB = 0; |
| 106 | for (int cy = 0; cy < fKernelSize.fHeight; cy++) { |
| 107 | for (int cx = 0; cx < fKernelSize.fWidth; cx++) { |
| 108 | SkPMColor s = PixelFetcher::fetch(src, x + cx - fTarget.fX, y + cy - fTarget.fY); |
| 109 | SkScalar k = fKernel[cy * fKernelSize.fWidth + cx]; |
| 110 | sumA += SkScalarMul(SkIntToScalar(SkGetPackedA32(s)), k); |
| 111 | sumR += SkScalarMul(SkIntToScalar(SkGetPackedR32(s)), k); |
| 112 | sumG += SkScalarMul(SkIntToScalar(SkGetPackedG32(s)), k); |
| 113 | sumB += SkScalarMul(SkIntToScalar(SkGetPackedB32(s)), k); |
| 114 | } |
| 115 | } |
| 116 | int a = SkScalarFloorToInt(SkScalarMul(sumA, fGain) + fBias); |
| 117 | int r = SkScalarFloorToInt(SkScalarMul(sumR, fGain) + fBias); |
| 118 | int g = SkScalarFloorToInt(SkScalarMul(sumG, fGain) + fBias); |
| 119 | int b = SkScalarFloorToInt(SkScalarMul(sumB, fGain) + fBias); |
| 120 | *dptr++ = SkPackARGB32(SkClampMax(a, 255), |
| 121 | SkClampMax(r, 255), |
| 122 | SkClampMax(g, 255), |
| 123 | SkClampMax(b, 255)); |
| 124 | } |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | void SkMatrixConvolutionImageFilter::filterInteriorPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) { |
| 129 | filterPixels<UncheckedPixelFetcher>(src, result, rect); |
| 130 | } |
| 131 | |
| 132 | void SkMatrixConvolutionImageFilter::filterBorderPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) { |
| 133 | switch (fTileMode) { |
| 134 | case kClamp_TileMode: |
| 135 | filterPixels<ClampPixelFetcher>(src, result, rect); |
| 136 | break; |
| 137 | case kRepeat_TileMode: |
| 138 | filterPixels<RepeatPixelFetcher>(src, result, rect); |
| 139 | break; |
| 140 | case kClampToBlack_TileMode: |
| 141 | filterPixels<ClampToBlackPixelFetcher>(src, result, rect); |
| 142 | break; |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | bool SkMatrixConvolutionImageFilter::onFilterImage(Proxy* proxy, |
| 147 | const SkBitmap& source, |
| 148 | const SkMatrix& matrix, |
| 149 | SkBitmap* result, |
| 150 | SkIPoint* loc) { |
| 151 | SkBitmap src = this->getInputResult(proxy, source, matrix, loc); |
| 152 | if (src.config() != SkBitmap::kARGB_8888_Config) { |
| 153 | return false; |
| 154 | } |
| 155 | |
| 156 | SkAutoLockPixels alp(src); |
| 157 | if (!src.getPixels()) { |
| 158 | return false; |
| 159 | } |
| 160 | |
| 161 | result->setConfig(src.config(), src.width(), src.height()); |
| 162 | result->allocPixels(); |
| 163 | |
| 164 | SkIRect interior = SkIRect::MakeXYWH(fTarget.fX, fTarget.fY, |
| 165 | src.width() - fKernelSize.fWidth + 1, |
| 166 | src.height() - fKernelSize.fHeight + 1); |
| 167 | SkIRect top = SkIRect::MakeWH(src.width(), fTarget.fY); |
| 168 | SkIRect bottom = SkIRect::MakeLTRB(0, interior.bottom(), |
| 169 | src.width(), src.height()); |
| 170 | SkIRect left = SkIRect::MakeXYWH(0, interior.top(), |
| 171 | fTarget.fX, interior.height()); |
| 172 | SkIRect right = SkIRect::MakeLTRB(interior.right(), interior.top(), |
| 173 | src.width(), interior.bottom()); |
| 174 | filterBorderPixels(src, result, top); |
| 175 | filterBorderPixels(src, result, left); |
| 176 | filterInteriorPixels(src, result, interior); |
| 177 | filterBorderPixels(src, result, right); |
| 178 | filterBorderPixels(src, result, bottom); |
| 179 | return true; |
| 180 | } |
| 181 | |
| 182 | SK_DEFINE_FLATTENABLE_REGISTRAR(SkMatrixConvolutionImageFilter) |
| 183 | |