humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2013 Google Inc. |
| 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 "SkBitmapProcState.h" |
| 9 | #include "SkBitmap.h" |
| 10 | #include "SkColor.h" |
| 11 | #include "SkColorPriv.h" |
| 12 | #include "SkUnPreMultiply.h" |
| 13 | #include "SkShader.h" |
| 14 | #include "SkRTConf.h" |
| 15 | #include "SkMath.h" |
| 16 | |
| 17 | void highQualityFilter(const SkBitmapProcState& s, int x, int y, |
| 18 | SkPMColor* SK_RESTRICT colors, int count) { |
| 19 | |
| 20 | const int maxX = s.fBitmap->width() - 1; |
| 21 | const int maxY = s.fBitmap->height() - 1; |
| 22 | |
| 23 | while (count-- > 0) { |
| 24 | SkPoint srcPt; |
| 25 | s.fInvProc(*s.fInvMatrix, SkIntToScalar(x), |
| 26 | SkIntToScalar(y), &srcPt); |
| 27 | srcPt.fX -= SK_ScalarHalf; |
| 28 | srcPt.fY -= SK_ScalarHalf; |
| 29 | |
| 30 | int sx = SkScalarFloorToInt(srcPt.fX); |
| 31 | int sy = SkScalarFloorToInt(srcPt.fY); |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 32 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 33 | SkFixed weight = 0; |
| 34 | SkFixed fr = 0, fg = 0, fb = 0, fa = 0; |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 35 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 36 | int y0 = SkClampMax(int(ceil(sy-s.getBitmapFilter()->width() + 0.5f)), maxY); |
| 37 | int y1 = SkClampMax(int(floor(sy+s.getBitmapFilter()->width() + 0.5f)), maxY); |
| 38 | int x0 = SkClampMax(int(ceil(sx-s.getBitmapFilter()->width() + 0.5f)), maxX); |
| 39 | int x1 = SkClampMax(int(floor(sx+s.getBitmapFilter()->width() + 0.5f)), maxX); |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 40 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 41 | for (int src_y = y0; src_y <= y1; src_y++) { |
| 42 | SkFixed yweight = s.getBitmapFilter()->lookup((srcPt.fY - src_y)); |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 43 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 44 | for (int src_x = x0; src_x <= x1 ; src_x++) { |
| 45 | SkFixed xweight = s.getBitmapFilter()->lookup((srcPt.fX - src_x)); |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 46 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 47 | SkFixed combined_weight = SkFixedMul(xweight, yweight); |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 48 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 49 | SkPMColor c = *s.fBitmap->getAddr32(src_x, src_y); |
| 50 | fr += combined_weight * SkGetPackedR32(c); |
| 51 | fg += combined_weight * SkGetPackedG32(c); |
| 52 | fb += combined_weight * SkGetPackedB32(c); |
| 53 | fa += combined_weight * SkGetPackedA32(c); |
| 54 | weight += combined_weight; |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | fr = SkFixedDiv(fr, weight); |
| 59 | fg = SkFixedDiv(fg, weight); |
| 60 | fb = SkFixedDiv(fb, weight); |
| 61 | fa = SkFixedDiv(fa, weight); |
| 62 | |
| 63 | int a = SkClampMax(SkFixedRoundToInt(fa), 255); |
| 64 | int r = SkClampMax(SkFixedRoundToInt(fr), a); |
| 65 | int g = SkClampMax(SkFixedRoundToInt(fg), a); |
| 66 | int b = SkClampMax(SkFixedRoundToInt(fb), a); |
| 67 | |
| 68 | *colors++ = SkPackARGB32(a, r, g, b); |
| 69 | |
| 70 | x++; |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | void highQualityFilter_ScaleOnly(const SkBitmapProcState &s, int x, int y, |
| 75 | SkPMColor *SK_RESTRICT colors, int count) { |
| 76 | const int maxX = s.fBitmap->width() - 1; |
| 77 | const int maxY = s.fBitmap->height() - 1; |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 78 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 79 | SkPoint srcPt; |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 80 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 81 | s.fInvProc(*s.fInvMatrix, SkIntToScalar(x), |
| 82 | SkIntToScalar(y), &srcPt); |
| 83 | srcPt.fY -= SK_ScalarHalf; |
| 84 | int sy = SkScalarFloorToInt(srcPt.fY); |
| 85 | int y0 = SkClampMax(int(ceil(sy-s.getBitmapFilter()->width() + 0.5f)), maxY); |
| 86 | int y1 = SkClampMax(int(floor(sy+s.getBitmapFilter()->width() + 0.5f)), maxY); |
| 87 | |
| 88 | while (count-- > 0) { |
| 89 | s.fInvProc(*s.fInvMatrix, SkIntToScalar(x), |
| 90 | SkIntToScalar(y), &srcPt); |
| 91 | srcPt.fX -= SK_ScalarHalf; |
| 92 | srcPt.fY -= SK_ScalarHalf; |
| 93 | |
| 94 | int sx = SkScalarFloorToInt(srcPt.fX); |
| 95 | |
| 96 | SkFixed weight = 0; |
| 97 | SkFixed fr = 0, fg = 0, fb = 0, fa = 0; |
| 98 | |
| 99 | int x0 = SkClampMax(int(ceil(sx-s.getBitmapFilter()->width() + 0.5f)), maxX); |
| 100 | int x1 = SkClampMax(int(floor(sx+s.getBitmapFilter()->width() + 0.5f)), maxX); |
| 101 | |
| 102 | for (int src_y = y0; src_y <= y1; src_y++) { |
| 103 | SkFixed yweight = s.getBitmapFilter()->lookup((srcPt.fY - src_y)); |
| 104 | |
| 105 | for (int src_x = x0; src_x <= x1 ; src_x++) { |
| 106 | SkFixed xweight = s.getBitmapFilter()->lookup((srcPt.fX - src_x)); |
| 107 | |
| 108 | SkFixed combined_weight = SkFixedMul(xweight, yweight); |
| 109 | |
| 110 | SkPMColor c = *s.fBitmap->getAddr32(src_x, src_y); |
| 111 | fr += combined_weight * SkGetPackedR32(c); |
| 112 | fg += combined_weight * SkGetPackedG32(c); |
| 113 | fb += combined_weight * SkGetPackedB32(c); |
| 114 | fa += combined_weight * SkGetPackedA32(c); |
| 115 | weight += combined_weight; |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | fr = SkFixedDiv(fr, weight); |
| 120 | fg = SkFixedDiv(fg, weight); |
| 121 | fb = SkFixedDiv(fb, weight); |
| 122 | fa = SkFixedDiv(fa, weight); |
| 123 | |
| 124 | int a = SkClampMax(SkFixedRoundToInt(fa), 255); |
| 125 | int r = SkClampMax(SkFixedRoundToInt(fr), a); |
| 126 | int g = SkClampMax(SkFixedRoundToInt(fg), a); |
| 127 | int b = SkClampMax(SkFixedRoundToInt(fb), a); |
| 128 | |
| 129 | *colors++ = SkPackARGB32(a, r, g, b); |
| 130 | |
| 131 | x++; |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 132 | } |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 133 | } |
| 134 | |
| 135 | SK_CONF_DECLARE(const char *, c_bitmapFilter, "bitmap.filter", "mitchell", "Which bitmap filter to use [mitchell, sinc, gaussian, triangle, box]"); |
| 136 | |
| 137 | static SkBitmapFilter *allocateBitmapFilter() { |
| 138 | if (!strcmp(c_bitmapFilter, "mitchell")) { |
| 139 | return SkNEW_ARGS(SkMitchellFilter,(1.f/3.f,1.f/3.f)); |
| 140 | } else if (!strcmp(c_bitmapFilter, "sinc")) { |
| 141 | return SkNEW_ARGS(SkSincFilter,(3)); |
| 142 | } else if (!strcmp(c_bitmapFilter, "gaussian")) { |
| 143 | return SkNEW_ARGS(SkGaussianFilter,(2)); |
| 144 | } else if (!strcmp(c_bitmapFilter, "triangle")) { |
| 145 | return SkNEW(SkTriangleFilter); |
| 146 | } else if (!strcmp(c_bitmapFilter, "box")) { |
| 147 | return SkNEW(SkBoxFilter); |
| 148 | } else { |
| 149 | SkASSERT(!!!"Unknown filter type"); |
| 150 | } |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 151 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 152 | return NULL; |
| 153 | } |
| 154 | |
| 155 | SkBitmapProcState::ShaderProc32 |
| 156 | SkBitmapProcState::chooseBitmapFilterProc(const SkPaint& paint) { |
| 157 | // we need to be requested |
| 158 | uint32_t mask = SkPaint::kFilterBitmap_Flag |
| 159 | | SkPaint::kHighQualityFilterBitmap_Flag |
| 160 | ; |
| 161 | if ((paint.getFlags() & mask) != mask) { |
| 162 | return NULL; |
| 163 | } |
| 164 | |
| 165 | // TODO: consider supporting other configs (e.g. 565, A8) |
| 166 | if (fBitmap->config() != SkBitmap::kARGB_8888_Config) { |
| 167 | return NULL; |
| 168 | } |
| 169 | |
| 170 | // TODO: consider supporting repeat and mirror |
| 171 | if (SkShader::kClamp_TileMode != fTileModeX || SkShader::kClamp_TileMode != fTileModeY) { |
| 172 | return NULL; |
| 173 | } |
| 174 | |
| 175 | // TODO: support blending inside our procs |
| 176 | if (0xFF != paint.getAlpha()) { |
| 177 | return NULL; |
| 178 | } |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 179 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 180 | if (fInvType & (SkMatrix::kAffine_Mask | SkMatrix::kScale_Mask)) { |
| 181 | fBitmapFilter = allocateBitmapFilter(); |
| 182 | } |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 183 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 184 | if (fInvType & SkMatrix::kAffine_Mask) { |
| 185 | return highQualityFilter; |
| 186 | } else if (fInvType & SkMatrix::kScale_Mask) { |
| 187 | return highQualityFilter_ScaleOnly; |
| 188 | } else { |
| 189 | return NULL; |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | static void divideByWeights(SkFixed *sums, SkFixed *weights, SkBitmap *dst) { |
| 194 | for (int y = 0 ; y < dst->height() ; y++) { |
| 195 | for (int x = 0 ; x < dst->width() ; x++) { |
| 196 | SkFixed fr = SkFixedDiv(sums[4*(y*dst->width() + x) + 0], weights[y*dst->width() + x]); |
| 197 | SkFixed fg = SkFixedDiv(sums[4*(y*dst->width() + x) + 1], weights[y*dst->width() + x]); |
| 198 | SkFixed fb = SkFixedDiv(sums[4*(y*dst->width() + x) + 2], weights[y*dst->width() + x]); |
| 199 | SkFixed fa = SkFixedDiv(sums[4*(y*dst->width() + x) + 3], weights[y*dst->width() + x]); |
| 200 | int a = SkClampMax(SkFixedRoundToInt(fa), 255); |
| 201 | int r = SkClampMax(SkFixedRoundToInt(fr), a); |
| 202 | int g = SkClampMax(SkFixedRoundToInt(fg), a); |
| 203 | int b = SkClampMax(SkFixedRoundToInt(fb), a); |
| 204 | |
| 205 | *dst->getAddr32(x,y) = SkPackARGB32(a, r, g, b); |
| 206 | } |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | static void upScaleHoriz(const SkBitmap *src, SkBitmap *dst, float scale, SkBitmapFilter *filter) { |
| 211 | for (int y = 0 ; y < src->height() ; y++) { |
| 212 | for (int x = 0 ; x < dst->width() ; x++) { |
| 213 | float sx = x / scale - 0.5f; |
| 214 | int x0 = SkClampMax(int(ceil(sx-filter->width() + 0.5f)), src->width()-1); |
| 215 | int x1 = SkClampMax(int(floor(sx+filter->width() + 0.5f)), src->width()-1); |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 216 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 217 | SkFixed total_weight = 0; |
| 218 | SkFixed fr = 0, fg = 0, fb = 0, fa = 0; |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 219 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 220 | for (int src_x = x0 ; src_x <= x1 ; src_x++) { |
| 221 | SkFixed weight = filter->lookup(sx - src_x); |
| 222 | SkPMColor c = *src->getAddr32(src_x,y); |
| 223 | fr += weight * SkGetPackedR32(c); |
| 224 | fg += weight * SkGetPackedG32(c); |
| 225 | fb += weight * SkGetPackedB32(c); |
| 226 | fa += weight * SkGetPackedA32(c); |
| 227 | total_weight += weight; |
| 228 | } |
| 229 | fr = SkFixedDiv(fr, total_weight); |
| 230 | fg = SkFixedDiv(fg, total_weight); |
| 231 | fb = SkFixedDiv(fb, total_weight); |
| 232 | fa = SkFixedDiv(fa, total_weight); |
| 233 | |
| 234 | int a = SkClampMax(SkFixedRoundToInt(fa), 255); |
| 235 | int r = SkClampMax(SkFixedRoundToInt(fr), a); |
| 236 | int g = SkClampMax(SkFixedRoundToInt(fg), a); |
| 237 | int b = SkClampMax(SkFixedRoundToInt(fb), a); |
| 238 | |
| 239 | *dst->getAddr32(x,y) = SkPackARGB32(a, r, g, b); |
| 240 | } |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | static void downScaleHoriz(const SkBitmap *src, SkBitmap *dst, float scale, SkBitmapFilter *filter) { |
| 245 | SkFixed *sums = SkNEW_ARRAY(SkFixed, dst->width() * dst->height() * 4); |
| 246 | SkFixed *weights = SkNEW_ARRAY(SkFixed, dst->width() * dst->height()); |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 247 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 248 | SkAutoTDeleteArray<SkFixed> ada1(sums); |
| 249 | SkAutoTDeleteArray<SkFixed> ada2(weights); |
| 250 | |
| 251 | memset(sums, 0, dst->width() * dst->height() * sizeof(SkFixed) * 4); |
| 252 | memset(weights, 0, dst->width() * dst->height() * sizeof(SkFixed)); |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 253 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 254 | for (int y = 0 ; y < src->height() ; y++) { |
| 255 | for (int x = 0 ; x < src->width() ; x++) { |
| 256 | // splat each source pixel into the destination image |
| 257 | float dx = (x + 0.5f) * scale; |
| 258 | int x0 = SkClampMax(int(ceil(dx-filter->width() + 0.5f)), dst->width()-1); |
| 259 | int x1 = SkClampMax(int(floor(dx+filter->width() + 0.5f)), dst->width()-1); |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 260 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 261 | SkPMColor c = *src->getAddr32(x,y); |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 262 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 263 | for (int dst_x = x0 ; dst_x <= x1 ; dst_x++) { |
| 264 | SkFixed weight = filter->lookup(dx - dst_x); |
| 265 | sums[4*(y*dst->width() + dst_x) + 0] += weight*SkGetPackedR32(c); |
| 266 | sums[4*(y*dst->width() + dst_x) + 1] += weight*SkGetPackedG32(c); |
| 267 | sums[4*(y*dst->width() + dst_x) + 2] += weight*SkGetPackedB32(c); |
| 268 | sums[4*(y*dst->width() + dst_x) + 3] += weight*SkGetPackedA32(c); |
| 269 | weights[y*dst->width() + dst_x] += weight; |
| 270 | } |
| 271 | } |
| 272 | } |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 273 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 274 | divideByWeights(sums, weights, dst); |
| 275 | } |
| 276 | |
| 277 | static void upScaleVert(const SkBitmap *src, SkBitmap *dst, float scale, SkBitmapFilter *filter) { |
| 278 | for (int y = 0 ; y < dst->height() ; y++) { |
| 279 | for (int x = 0 ; x < dst->width() ; x++) { |
| 280 | float sy = y / scale - 0.5f; |
| 281 | int y0 = SkClampMax(int(ceil(sy-filter->width() + 0.5f)), src->height()-1); |
| 282 | int y1 = SkClampMax(int(floor(sy+filter->width() + 0.5f)), src->height()-1); |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 283 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 284 | SkFixed total_weight = 0; |
| 285 | SkFixed fr = 0, fg = 0, fb = 0, fa = 0; |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 286 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 287 | for (int src_y = y0 ; src_y <= y1 ; src_y++) { |
| 288 | SkFixed weight = filter->lookup(sy - src_y); |
| 289 | SkPMColor c = *src->getAddr32(x,src_y); |
| 290 | fr += weight * SkGetPackedR32(c); |
| 291 | fg += weight * SkGetPackedG32(c); |
| 292 | fb += weight * SkGetPackedB32(c); |
| 293 | fa += weight * SkGetPackedA32(c); |
| 294 | total_weight += weight; |
| 295 | } |
| 296 | fr = SkFixedDiv(fr, total_weight); |
| 297 | fg = SkFixedDiv(fg, total_weight); |
| 298 | fb = SkFixedDiv(fb, total_weight); |
| 299 | fa = SkFixedDiv(fa, total_weight); |
| 300 | |
| 301 | int a = SkClampMax(SkFixedRoundToInt(fa), 255); |
| 302 | int r = SkClampMax(SkFixedRoundToInt(fr), a); |
| 303 | int g = SkClampMax(SkFixedRoundToInt(fg), a); |
| 304 | int b = SkClampMax(SkFixedRoundToInt(fb), a); |
| 305 | |
| 306 | *dst->getAddr32(x,y) = SkPackARGB32(a, r, g, b); |
| 307 | } |
| 308 | } |
| 309 | } |
| 310 | |
| 311 | static void downScaleVert(const SkBitmap *src, SkBitmap *dst, float scale, SkBitmapFilter *filter) { |
| 312 | SkFixed *sums = SkNEW_ARRAY(SkFixed, dst->width() * dst->height() * 4); |
| 313 | SkFixed *weights = SkNEW_ARRAY(SkFixed, dst->width() * dst->height()); |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 314 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 315 | SkAutoTDeleteArray<SkFixed> ada1(sums); |
| 316 | SkAutoTDeleteArray<SkFixed> ada2(weights); |
| 317 | |
| 318 | memset(sums, 0, dst->width() * dst->height() * sizeof(SkFixed) * 4); |
| 319 | memset(weights, 0, dst->width() * dst->height() * sizeof(SkFixed)); |
| 320 | |
| 321 | for (int y = 0 ; y < src->height() ; y++) { |
| 322 | for (int x = 0 ; x < src->width() ; x++) { |
| 323 | // splat each source pixel into the destination image |
| 324 | float dy = (y + 0.5f) * scale; |
| 325 | int y0 = SkClampMax(int(ceil(dy-filter->width() + 0.5f)), dst->height()-1); |
| 326 | int y1 = SkClampMax(int(floor(dy+filter->width() + 0.5f)), dst->height()-1); |
| 327 | |
| 328 | SkPMColor c = *src->getAddr32(x,y); |
| 329 | |
| 330 | for (int dst_y = y0 ; dst_y <= y1 ; dst_y++) { |
| 331 | SkFixed weight = filter->lookup(dy - dst_y); |
| 332 | sums[4*(dst_y*dst->width() + x) + 0] += weight*SkGetPackedR32(c); |
| 333 | sums[4*(dst_y*dst->width() + x) + 1] += weight*SkGetPackedG32(c); |
| 334 | sums[4*(dst_y*dst->width() + x) + 2] += weight*SkGetPackedB32(c); |
| 335 | sums[4*(dst_y*dst->width() + x) + 3] += weight*SkGetPackedA32(c); |
| 336 | weights[dst_y*dst->width() + x] += weight; |
| 337 | } |
| 338 | } |
| 339 | } |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 340 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 341 | divideByWeights(sums, weights, dst); |
| 342 | } |
| 343 | |
| 344 | void SkBitmap::scale(SkBitmap *dst) const { |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 345 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 346 | SkBitmap horiz_temp; |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 347 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 348 | horiz_temp.setConfig(SkBitmap::kARGB_8888_Config, dst->width(), height()); |
| 349 | horiz_temp.allocPixels(); |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 350 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 351 | SkBitmapFilter *filter = allocateBitmapFilter(); |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 352 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 353 | float horiz_scale = float(dst->width()) / width(); |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 354 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 355 | if (horiz_scale == 1) { |
| 356 | this->copyPixelsTo(horiz_temp.getPixels(), getSize()); |
| 357 | } else if (horiz_scale > 1) { |
| 358 | upScaleHoriz(this, &horiz_temp, horiz_scale, filter); |
| 359 | } else if (horiz_scale < 1) { |
| 360 | downScaleHoriz(this, &horiz_temp, horiz_scale, filter); |
| 361 | } |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 362 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 363 | float vert_scale = float(dst->height()) / height(); |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 364 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 365 | if (vert_scale == 1) { |
| 366 | horiz_temp.copyPixelsTo(dst->getPixels(), dst->getSize()); |
| 367 | } else if (vert_scale > 1) { |
| 368 | upScaleVert(&horiz_temp, dst, vert_scale, filter); |
| 369 | } else if (vert_scale < 1) { |
| 370 | downScaleVert(&horiz_temp, dst, vert_scale, filter); |
| 371 | } |
skia.committer@gmail.com | 9e1ec1a | 2013-07-10 07:00:58 +0000 | [diff] [blame^] | 372 | |
humper@google.com | b088947 | 2013-07-09 21:37:14 +0000 | [diff] [blame] | 373 | SkDELETE(filter); |
| 374 | } |