senorblanco@chromium.org | 05054f1 | 2012-03-02 21:05:45 +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 "SkMorphologyImageFilter.h" |
| 9 | #include "SkColorPriv.h" |
| 10 | |
| 11 | SkMorphologyImageFilter::SkMorphologyImageFilter(SkFlattenableReadBuffer& buffer) |
| 12 | : INHERITED(buffer) { |
| 13 | fRadius.fWidth = buffer.readScalar(); |
| 14 | fRadius.fHeight = buffer.readScalar(); |
| 15 | } |
| 16 | |
| 17 | SkMorphologyImageFilter::SkMorphologyImageFilter(int radiusX, int radiusY) |
| 18 | : fRadius(SkISize::Make(radiusX, radiusY)) { |
| 19 | } |
| 20 | |
| 21 | |
| 22 | void SkMorphologyImageFilter::flatten(SkFlattenableWriteBuffer& buffer) { |
| 23 | this->INHERITED::flatten(buffer); |
| 24 | buffer.writeScalar(fRadius.fWidth); |
| 25 | buffer.writeScalar(fRadius.fHeight); |
| 26 | } |
| 27 | |
| 28 | static void erode(const SkPMColor* src, SkPMColor* dst, |
| 29 | int radius, int width, int height, |
| 30 | int srcStrideX, int srcStrideY, |
| 31 | int dstStrideX, int dstStrideY) |
| 32 | { |
| 33 | const SkPMColor* upperSrc = src + SkMin32(radius, width - 1) * srcStrideX; |
| 34 | for (int x = 0; x < width; ++x) { |
| 35 | const SkPMColor* lp = src; |
| 36 | const SkPMColor* up = upperSrc; |
| 37 | SkPMColor* dptr = dst; |
| 38 | for (int y = 0; y < height; ++y) { |
| 39 | int minB = 255, minG = 255, minR = 255, minA = 255; |
| 40 | for (const SkPMColor* p = lp; p <= up; p += srcStrideX) { |
| 41 | int b = SkGetPackedB32(*p); |
| 42 | int g = SkGetPackedG32(*p); |
| 43 | int r = SkGetPackedR32(*p); |
| 44 | int a = SkGetPackedA32(*p); |
| 45 | if (b < minB) minB = b; |
| 46 | if (g < minG) minG = g; |
| 47 | if (r < minR) minR = r; |
| 48 | if (a < minA) minA = a; |
| 49 | } |
| 50 | *dptr = SkPackARGB32(minA, minR, minG, minB); |
| 51 | dptr += dstStrideY; |
| 52 | lp += srcStrideY; |
| 53 | up += srcStrideY; |
| 54 | } |
| 55 | if (x >= radius) src += srcStrideX; |
| 56 | if (x + radius < width - 1) upperSrc += srcStrideX; |
| 57 | dst += dstStrideX; |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | static void erodeX(const SkBitmap& src, SkBitmap* dst, int radiusX) |
| 62 | { |
| 63 | erode(src.getAddr32(0, 0), dst->getAddr32(0, 0), |
| 64 | radiusX, src.width(), src.height(), |
| 65 | 1, src.rowBytesAsPixels(), 1, dst->rowBytesAsPixels()); |
| 66 | } |
| 67 | |
| 68 | static void erodeY(const SkBitmap& src, SkBitmap* dst, int radiusY) |
| 69 | { |
| 70 | erode(src.getAddr32(0, 0), dst->getAddr32(0, 0), |
| 71 | radiusY, src.height(), src.width(), |
| 72 | src.rowBytesAsPixels(), 1, dst->rowBytesAsPixels(), 1); |
| 73 | } |
| 74 | |
| 75 | static void dilate(const SkPMColor* src, SkPMColor* dst, |
| 76 | int radius, int width, int height, |
| 77 | int srcStrideX, int srcStrideY, |
| 78 | int dstStrideX, int dstStrideY) |
| 79 | { |
| 80 | const SkPMColor* upperSrc = src + SkMin32(radius, width - 1) * srcStrideX; |
| 81 | for (int x = 0; x < width; ++x) { |
| 82 | const SkPMColor* lp = src; |
| 83 | const SkPMColor* up = upperSrc; |
| 84 | SkPMColor* dptr = dst; |
| 85 | for (int y = 0; y < height; ++y) { |
| 86 | int maxB = 0, maxG = 0, maxR = 0, maxA = 0; |
| 87 | for (const SkPMColor* p = lp; p <= up; p += srcStrideX) { |
| 88 | int b = SkGetPackedB32(*p); |
| 89 | int g = SkGetPackedG32(*p); |
| 90 | int r = SkGetPackedR32(*p); |
| 91 | int a = SkGetPackedA32(*p); |
| 92 | if (b > maxB) maxB = b; |
| 93 | if (g > maxG) maxG = g; |
| 94 | if (r > maxR) maxR = r; |
| 95 | if (a > maxA) maxA = a; |
| 96 | } |
| 97 | *dptr = SkPackARGB32(maxA, maxR, maxG, maxB); |
| 98 | dptr += dstStrideY; |
| 99 | lp += srcStrideY; |
| 100 | up += srcStrideY; |
| 101 | } |
| 102 | if (x >= radius) src += srcStrideX; |
| 103 | if (x + radius < width - 1) upperSrc += srcStrideX; |
| 104 | dst += dstStrideX; |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | static void dilateX(const SkBitmap& src, SkBitmap* dst, int radiusX) |
| 109 | { |
| 110 | dilate(src.getAddr32(0, 0), dst->getAddr32(0, 0), |
| 111 | radiusX, src.width(), src.height(), |
| 112 | 1, src.rowBytesAsPixels(), 1, dst->rowBytesAsPixels()); |
| 113 | } |
| 114 | |
| 115 | static void dilateY(const SkBitmap& src, SkBitmap* dst, int radiusY) |
| 116 | { |
| 117 | dilate(src.getAddr32(0, 0), dst->getAddr32(0, 0), |
| 118 | radiusY, src.height(), src.width(), |
| 119 | src.rowBytesAsPixels(), 1, dst->rowBytesAsPixels(), 1); |
| 120 | } |
| 121 | |
| 122 | bool SkErodeImageFilter::onFilterImage(Proxy*, |
| 123 | const SkBitmap& src, const SkMatrix&, |
| 124 | SkBitmap* dst, SkIPoint*) { |
| 125 | if (src.config() != SkBitmap::kARGB_8888_Config) { |
| 126 | return false; |
| 127 | } |
| 128 | |
| 129 | SkAutoLockPixels alp(src); |
| 130 | if (!src.getPixels()) { |
| 131 | return false; |
| 132 | } |
| 133 | |
| 134 | dst->setConfig(src.config(), src.width(), src.height()); |
| 135 | dst->allocPixels(); |
| 136 | |
| 137 | int width = radius().width(); |
| 138 | int height = radius().height(); |
| 139 | |
| 140 | if (width < 0 || height < 0) { |
| 141 | return false; |
| 142 | } |
| 143 | |
| 144 | if (width == 0 && height == 0) { |
| 145 | src.copyTo(dst, dst->config()); |
| 146 | return true; |
| 147 | } |
| 148 | |
| 149 | SkBitmap temp; |
| 150 | temp.setConfig(dst->config(), dst->width(), dst->height()); |
| 151 | if (!temp.allocPixels()) { |
| 152 | return false; |
| 153 | } |
| 154 | |
| 155 | if (width > 0 && height > 0) { |
| 156 | erodeX(src, &temp, width); |
| 157 | erodeY(temp, dst, height); |
| 158 | } else if (width > 0) { |
| 159 | erodeX(src, dst, width); |
| 160 | } else if (height > 0) { |
| 161 | erodeY(src, dst, height); |
| 162 | } |
| 163 | return true; |
| 164 | } |
| 165 | |
| 166 | bool SkDilateImageFilter::onFilterImage(Proxy*, |
| 167 | const SkBitmap& src, const SkMatrix&, |
| 168 | SkBitmap* dst, SkIPoint*) { |
| 169 | if (src.config() != SkBitmap::kARGB_8888_Config) { |
| 170 | return false; |
| 171 | } |
| 172 | |
| 173 | SkAutoLockPixels alp(src); |
| 174 | if (!src.getPixels()) { |
| 175 | return false; |
| 176 | } |
| 177 | |
| 178 | dst->setConfig(src.config(), src.width(), src.height()); |
| 179 | dst->allocPixels(); |
| 180 | |
| 181 | int width = radius().width(); |
| 182 | int height = radius().height(); |
| 183 | |
| 184 | if (width < 0 || height < 0) { |
| 185 | return false; |
| 186 | } |
| 187 | |
| 188 | if (width == 0 && height == 0) { |
| 189 | src.copyTo(dst, dst->config()); |
| 190 | return true; |
| 191 | } |
| 192 | |
| 193 | SkBitmap temp; |
| 194 | temp.setConfig(dst->config(), dst->width(), dst->height()); |
| 195 | if (!temp.allocPixels()) { |
| 196 | return false; |
| 197 | } |
| 198 | |
| 199 | if (width > 0 && height > 0) { |
| 200 | dilateX(src, &temp, width); |
| 201 | dilateY(temp, dst, height); |
| 202 | } else if (width > 0) { |
| 203 | dilateX(src, dst, width); |
| 204 | } else if (height > 0) { |
| 205 | dilateY(src, dst, height); |
| 206 | } |
| 207 | return true; |
| 208 | } |
| 209 | |
| 210 | bool SkDilateImageFilter::asADilate(SkISize* radius) const { |
| 211 | *radius = this->radius(); |
| 212 | return true; |
| 213 | } |
| 214 | |
| 215 | bool SkErodeImageFilter::asAnErode(SkISize* radius) const { |
| 216 | *radius = this->radius(); |
| 217 | return true; |
| 218 | } |
| 219 | |
| 220 | SK_DEFINE_FLATTENABLE_REGISTRAR(SkDilateImageFilter) |
| 221 | SK_DEFINE_FLATTENABLE_REGISTRAR(SkErodeImageFilter) |