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| 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); |
| 32 |
| 33 SkFixed weight = 0; |
| 34 SkFixed fr = 0, fg = 0, fb = 0, fa = 0; |
| 35 |
| 36 int y0 = SkClampMax(int(ceil(sy-s.getBitmapFilter()->width() + 0.5f)), m
axY); |
| 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)), m
axX); |
| 39 int x1 = SkClampMax(int(floor(sx+s.getBitmapFilter()->width() + 0.5f)),
maxX); |
| 40 |
| 41 for (int src_y = y0; src_y <= y1; src_y++) { |
| 42 SkFixed yweight = s.getBitmapFilter()->lookup((srcPt.fY - src_y)); |
| 43 |
| 44 for (int src_x = x0; src_x <= x1 ; src_x++) { |
| 45 SkFixed xweight = s.getBitmapFilter()->lookup((srcPt.fX - src_x)
); |
| 46 |
| 47 SkFixed combined_weight = SkFixedMul(xweight, yweight); |
| 48 |
| 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; |
| 78 |
| 79 SkPoint srcPt; |
| 80 |
| 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)), max
Y); |
| 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++; |
| 132 } |
| 133 } |
| 134 |
| 135 SK_CONF_DECLARE(const char *, c_bitmapFilter, "bitmap.filter", "mitchell", "Whic
h 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 } |
| 151 |
| 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 } |
| 179 |
| 180 if (fInvType & (SkMatrix::kAffine_Mask | SkMatrix::kScale_Mask)) { |
| 181 fBitmapFilter = allocateBitmapFilter(); |
| 182 } |
| 183 |
| 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, SkBitm
apFilter *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->widt
h()-1); |
| 216 |
| 217 SkFixed total_weight = 0; |
| 218 SkFixed fr = 0, fg = 0, fb = 0, fa = 0; |
| 219 |
| 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, SkBi
tmapFilter *filter) { |
| 245 SkFixed *sums = SkNEW_ARRAY(SkFixed, dst->width() * dst->height() * 4); |
| 246 SkFixed *weights = SkNEW_ARRAY(SkFixed, dst->width() * dst->height()); |
| 247 |
| 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)); |
| 253 |
| 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->widt
h()-1); |
| 260 |
| 261 SkPMColor c = *src->getAddr32(x,y); |
| 262 |
| 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 } |
| 273 |
| 274 divideByWeights(sums, weights, dst); |
| 275 } |
| 276 |
| 277 static void upScaleVert(const SkBitmap *src, SkBitmap *dst, float scale, SkBitma
pFilter *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->heigh
t()-1); |
| 282 int y1 = SkClampMax(int(floor(sy+filter->width() + 0.5f)), src->heig
ht()-1); |
| 283 |
| 284 SkFixed total_weight = 0; |
| 285 SkFixed fr = 0, fg = 0, fb = 0, fa = 0; |
| 286 |
| 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, SkBit
mapFilter *filter) { |
| 312 SkFixed *sums = SkNEW_ARRAY(SkFixed, dst->width() * dst->height() * 4); |
| 313 SkFixed *weights = SkNEW_ARRAY(SkFixed, dst->width() * dst->height()); |
| 314 |
| 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->heigh
t()-1); |
| 326 int y1 = SkClampMax(int(floor(dy+filter->width() + 0.5f)), dst->heig
ht()-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 } |
| 340 |
| 341 divideByWeights(sums, weights, dst); |
| 342 } |
| 343 |
| 344 void SkBitmap::scale(SkBitmap *dst) const { |
| 345 |
| 346 SkBitmap horiz_temp; |
| 347 |
| 348 horiz_temp.setConfig(SkBitmap::kARGB_8888_Config, dst->width(), height()); |
| 349 horiz_temp.allocPixels(); |
| 350 |
| 351 SkBitmapFilter *filter = allocateBitmapFilter(); |
| 352 |
| 353 float horiz_scale = float(dst->width()) / width(); |
| 354 |
| 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 } |
| 362 |
| 363 float vert_scale = float(dst->height()) / height(); |
| 364 |
| 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 } |
| 372 |
| 373 SkDELETE(filter); |
| 374 } |
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