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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, | |
reed1
2013/07/09 14:25:47
is this guy exported? (I don't see static, nor som
humper
2013/07/09 14:47:26
I suppose it's not; only a function pointer to it
humper
2013/07/09 15:26:30
ah, actually it is; I look to see if the shader pr
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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 SkScalar fractx = srcPt.fX - SkScalarFloorToScalar(srcPt.fX); | |
30 SkScalar fracty = srcPt.fY - SkScalarFloorToScalar(srcPt.fY); | |
31 | |
32 int sx = SkScalarFloorToInt(srcPt.fX); | |
33 int sy = SkScalarFloorToInt(srcPt.fY); | |
34 | |
35 SkFixed weight = 0; | |
36 SkFixed fr = 0, fg = 0, fb = 0, fa = 0; | |
37 | |
38 int y0 = SkClampMax(int(ceil(sy-s.fBitmapFilter->width() + 0.5f)), maxY) ; | |
39 int y1 = SkClampMax(int(floor(sy+s.fBitmapFilter->width() + 0.5f)), maxY ); | |
40 int x0 = SkClampMax(int(ceil(sx-s.fBitmapFilter->width() + 0.5f)), maxX) ; | |
41 int x1 = SkClampMax(int(floor(sx+s.fBitmapFilter->width() + 0.5f)), maxX ); | |
42 | |
43 for (int src_y = y0; src_y <= y1; src_y++) { | |
44 SkFixed yweight = s.fBitmapFilter->lookup((srcPt.fY - src_y)); | |
45 | |
46 for (int src_x = x0; src_x <= x1 ; src_x++) { | |
47 SkFixed xweight = s.fBitmapFilter->lookup((srcPt.fX - src_x)); | |
48 | |
49 SkFixed combined_weight = SkFixedMul(xweight, yweight); | |
50 | |
51 SkPMColor c = *s.fBitmap->getAddr32(src_x, src_y); | |
52 fr += combined_weight * SkGetPackedR32(c); | |
53 fg += combined_weight * SkGetPackedG32(c); | |
54 fb += combined_weight * SkGetPackedB32(c); | |
55 fa += combined_weight * SkGetPackedA32(c); | |
56 weight += combined_weight; | |
57 } | |
58 } | |
59 | |
60 fr = SkFixedDiv(fr, weight); | |
61 fg = SkFixedDiv(fg, weight); | |
62 fb = SkFixedDiv(fb, weight); | |
63 fa = SkFixedDiv(fa, weight); | |
64 | |
65 int a = SkClampMax(SkFixedRoundToInt(fa), 255); | |
66 int r = SkClampMax(SkFixedRoundToInt(fr), a); | |
67 int g = SkClampMax(SkFixedRoundToInt(fg), a); | |
68 int b = SkClampMax(SkFixedRoundToInt(fb), a); | |
69 | |
70 *colors++ = SkPackARGB32(a, r, g, b); | |
71 | |
72 x++; | |
73 } | |
74 } | |
75 | |
76 void highQualityFilter_ScaleOnly(const SkBitmapProcState &s, int x, int y, | |
77 SkPMColor *SK_RESTRICT colors, int count) { | |
78 const int maxX = s.fBitmap->width() - 1; | |
79 const int maxY = s.fBitmap->height() - 1; | |
80 | |
81 SkPoint srcPt; | |
82 | |
83 s.fInvProc(*s.fInvMatrix, SkIntToScalar(x), | |
84 SkIntToScalar(y), &srcPt); | |
85 srcPt.fY -= SK_ScalarHalf; | |
86 SkScalar fracty = srcPt.fY - SkScalarFloorToScalar(srcPt.fY); | |
87 int sy = SkScalarFloorToInt(srcPt.fY); | |
88 int y0 = SkClampMax(int(ceil(sy-s.fBitmapFilter->width() + 0.5f)), maxY); | |
89 int y1 = SkClampMax(int(floor(sy+s.fBitmapFilter->width() + 0.5f)), maxY); | |
90 | |
91 while (count-- > 0) { | |
92 s.fInvProc(*s.fInvMatrix, SkIntToScalar(x), | |
93 SkIntToScalar(y), &srcPt); | |
94 srcPt.fX -= SK_ScalarHalf; | |
95 srcPt.fY -= SK_ScalarHalf; | |
96 SkScalar fractx = srcPt.fX - SkScalarFloorToScalar(srcPt.fX); | |
97 | |
98 int sx = SkScalarFloorToInt(srcPt.fX); | |
99 | |
100 SkFixed weight = 0; | |
101 SkFixed fr = 0, fg = 0, fb = 0, fa = 0; | |
102 | |
103 int x0 = SkClampMax(int(ceil(sx-s.fBitmapFilter->width() + 0.5f)), maxX ); | |
104 int x1 = SkClampMax(int(floor(sx+s.fBitmapFilter->width() + 0.5f)), max X); | |
105 | |
106 for (int src_y = y0; src_y <= y1; src_y++) { | |
107 SkFixed yweight = s.fBitmapFilter->lookup((srcPt.fY - src_y)); | |
108 | |
109 for (int src_x = x0; src_x <= x1 ; src_x++) { | |
110 SkFixed xweight = s.fBitmapFilter->lookup((srcPt.fX - src_x)); | |
111 | |
112 SkFixed combined_weight = SkFixedMul(xweight, yweight); | |
113 | |
114 SkPMColor c = *s.fBitmap->getAddr32(src_x, src_y); | |
115 fr += combined_weight * SkGetPackedR32(c); | |
116 fg += combined_weight * SkGetPackedG32(c); | |
117 fb += combined_weight * SkGetPackedB32(c); | |
118 fa += combined_weight * SkGetPackedA32(c); | |
119 weight += combined_weight; | |
120 } | |
121 } | |
122 | |
123 fr = SkFixedDiv(fr, weight); | |
124 fg = SkFixedDiv(fg, weight); | |
125 fb = SkFixedDiv(fb, weight); | |
126 fa = SkFixedDiv(fa, weight); | |
127 | |
128 int a = SkClampMax(SkFixedRoundToInt(fa), 255); | |
129 int r = SkClampMax(SkFixedRoundToInt(fr), a); | |
130 int g = SkClampMax(SkFixedRoundToInt(fg), a); | |
131 int b = SkClampMax(SkFixedRoundToInt(fb), a); | |
132 | |
133 *colors++ = SkPackARGB32(a, r, g, b); | |
134 | |
135 x++; | |
136 } | |
137 } | |
138 | |
139 SK_CONF_DECLARE(const char *, c_bitmapFilter, "bitmap.filter", "mitchell", "Whic h bitmap filter to use [mitchell, sinc, gaussian, triangle, box]"); | |
140 | |
141 static SkBitmapFilter *allocateBitmapFilter() { | |
142 if (!strcmp(c_bitmapFilter, "mitchell")) { | |
143 return SkNEW_ARGS(SkMitchellFilter,(1.f/3.f,1.f/3.f)); | |
144 } else if (!strcmp(c_bitmapFilter, "sinc")) { | |
145 return SkNEW_ARGS(SkSincFilter,(3)); | |
146 } else if (!strcmp(c_bitmapFilter, "gaussian")) { | |
147 return SkNEW_ARGS(SkGaussianFilter,(2)); | |
148 } else if (!strcmp(c_bitmapFilter, "triangle")) { | |
149 return SkNEW(SkTriangleFilter); | |
150 } else if (!strcmp(c_bitmapFilter, "box")) { | |
151 return SkNEW(SkBoxFilter); | |
152 } else { | |
153 SkASSERT(!!!"Unknown filter type"); | |
154 } | |
155 | |
156 return NULL; | |
157 } | |
158 | |
159 SkBitmapProcState::ShaderProc32 | |
160 SkBitmapProcState::chooseBitmapFilterProc(const SkPaint& paint) { | |
161 // we need to be requested | |
162 uint32_t mask = SkPaint::kFilterBitmap_Flag | |
163 | SkPaint::kHighQualityFilterBitmap_Flag | |
164 ; | |
165 if ((paint.getFlags() & mask) != mask) { | |
166 return NULL; | |
167 } | |
168 | |
169 // TODO: consider supporting other configs (e.g. 565, A8) | |
170 if (fBitmap->config() != SkBitmap::kARGB_8888_Config) { | |
171 return NULL; | |
172 } | |
173 | |
174 // TODO: consider supporting repeat and mirror | |
175 if (SkShader::kClamp_TileMode != fTileModeX || SkShader::kClamp_TileMode != fTileModeY) { | |
176 return NULL; | |
177 } | |
178 | |
179 // TODO: support blending inside our procs | |
180 if (0xFF != paint.getAlpha()) { | |
181 return NULL; | |
182 } | |
183 | |
184 if (fInvType & (SkMatrix::kAffine_Mask | SkMatrix::kScale_Mask)) { | |
185 fBitmapFilter = allocateBitmapFilter(); | |
186 } | |
187 | |
188 if (fInvType & SkMatrix::kAffine_Mask) { | |
189 return highQualityFilter; | |
190 } else if (fInvType & SkMatrix::kScale_Mask) { | |
191 return highQualityFilter_ScaleOnly; | |
192 } else { | |
193 return NULL; | |
194 } | |
195 } | |
196 | |
197 static void divideByWeights(SkFixed *sums, SkFixed *weights, SkBitmap *dst) { | |
198 for (int y = 0 ; y < dst->height() ; y++) { | |
199 for (int x = 0 ; x < dst->width() ; x++) { | |
200 SkFixed fr = SkFixedDiv(sums[4*(y*dst->width() + x) + 0], weights[y* dst->width() + x]); | |
201 SkFixed fg = SkFixedDiv(sums[4*(y*dst->width() + x) + 1], weights[y* dst->width() + x]); | |
202 SkFixed fb = SkFixedDiv(sums[4*(y*dst->width() + x) + 2], weights[y* dst->width() + x]); | |
203 SkFixed fa = SkFixedDiv(sums[4*(y*dst->width() + x) + 3], weights[y* dst->width() + x]); | |
204 int a = SkClampMax(SkFixedRoundToInt(fa), 255); | |
205 int r = SkClampMax(SkFixedRoundToInt(fr), a); | |
206 int g = SkClampMax(SkFixedRoundToInt(fg), a); | |
207 int b = SkClampMax(SkFixedRoundToInt(fb), a); | |
208 | |
209 *dst->getAddr32(x,y) = SkPackARGB32(a, r, g, b); | |
210 } | |
211 } | |
212 } | |
213 | |
214 static void upScaleHoriz(const SkBitmap *src, SkBitmap *dst, float scale, SkBitm apFilter *filter) { | |
215 for (int y = 0 ; y < src->height() ; y++) { | |
216 for (int x = 0 ; x < dst->width() ; x++) { | |
217 float sx = x / scale - 0.5f; | |
218 int x0 = SkClampMax(int(ceil(sx-filter->width() + 0.5f)), src->width ()-1); | |
219 int x1 = SkClampMax(int(floor(sx+filter->width() + 0.5f)), src->widt h()-1); | |
220 | |
221 SkFixed total_weight = 0; | |
222 SkFixed fr = 0, fg = 0, fb = 0, fa = 0; | |
223 | |
224 for (int src_x = x0 ; src_x <= x1 ; src_x++) { | |
225 SkFixed weight = filter->lookup(sx - src_x); | |
226 SkPMColor c = *src->getAddr32(src_x,y); | |
227 fr += weight * SkGetPackedR32(c); | |
228 fg += weight * SkGetPackedG32(c); | |
229 fb += weight * SkGetPackedB32(c); | |
230 fa += weight * SkGetPackedA32(c); | |
231 total_weight += weight; | |
232 } | |
233 fr = SkFixedDiv(fr, total_weight); | |
234 fg = SkFixedDiv(fg, total_weight); | |
235 fb = SkFixedDiv(fb, total_weight); | |
236 fa = SkFixedDiv(fa, total_weight); | |
237 | |
238 int a = SkClampMax(SkFixedRoundToInt(fa), 255); | |
239 int r = SkClampMax(SkFixedRoundToInt(fr), a); | |
240 int g = SkClampMax(SkFixedRoundToInt(fg), a); | |
241 int b = SkClampMax(SkFixedRoundToInt(fb), a); | |
242 | |
243 *dst->getAddr32(x,y) = SkPackARGB32(a, r, g, b); | |
244 } | |
245 } | |
246 } | |
247 | |
248 static void downScaleHoriz(const SkBitmap *src, SkBitmap *dst, float scale, SkBi tmapFilter *filter) { | |
249 SkFixed *sums = SkNEW_ARRAY(SkFixed, dst->width() * dst->height() * 4); | |
250 SkFixed *weights = SkNEW_ARRAY(SkFixed, dst->width() * dst->height()); | |
251 | |
252 SkAutoTDeleteArray<SkFixed> ada1(sums); | |
253 SkAutoTDeleteArray<SkFixed> ada2(weights); | |
254 | |
255 memset(sums, 0, dst->width() * dst->height() * sizeof(SkFixed) * 4); | |
256 memset(weights, 0, dst->width() * dst->height() * sizeof(SkFixed)); | |
257 | |
258 for (int y = 0 ; y < src->height() ; y++) { | |
259 for (int x = 0 ; x < src->width() ; x++) { | |
260 // splat each source pixel into the destination image | |
261 float dx = (x + 0.5f) * scale; | |
262 int x0 = SkClampMax(int(ceil(dx-filter->width() + 0.5f)), dst->width ()-1); | |
263 int x1 = SkClampMax(int(floor(dx+filter->width() + 0.5f)), dst->widt h()-1); | |
264 | |
265 SkPMColor c = *src->getAddr32(x,y); | |
266 | |
267 for (int dst_x = x0 ; dst_x <= x1 ; dst_x++) { | |
268 SkFixed weight = filter->lookup(dx - dst_x); | |
269 sums[4*(y*dst->width() + dst_x) + 0] += weight*SkGetPackedR32(c) ; | |
270 sums[4*(y*dst->width() + dst_x) + 1] += weight*SkGetPackedG32(c) ; | |
271 sums[4*(y*dst->width() + dst_x) + 2] += weight*SkGetPackedB32(c) ; | |
272 sums[4*(y*dst->width() + dst_x) + 3] += weight*SkGetPackedA32(c) ; | |
273 weights[y*dst->width() + dst_x] += weight; | |
274 } | |
275 } | |
276 } | |
277 | |
278 divideByWeights(sums, weights, dst); | |
279 } | |
280 | |
281 static void upScaleVert(const SkBitmap *src, SkBitmap *dst, float scale, SkBitma pFilter *filter) { | |
282 for (int y = 0 ; y < dst->height() ; y++) { | |
283 for (int x = 0 ; x < dst->width() ; x++) { | |
284 float sy = y / scale - 0.5f; | |
285 int y0 = SkClampMax(int(ceil(sy-filter->width() + 0.5f)), src->heigh t()-1); | |
286 int y1 = SkClampMax(int(floor(sy+filter->width() + 0.5f)), src->heig ht()-1); | |
287 | |
288 SkFixed total_weight = 0; | |
289 SkFixed fr = 0, fg = 0, fb = 0, fa = 0; | |
290 | |
291 for (int src_y = y0 ; src_y <= y1 ; src_y++) { | |
292 SkFixed weight = filter->lookup(sy - src_y); | |
293 SkPMColor c = *src->getAddr32(x,src_y); | |
294 fr += weight * SkGetPackedR32(c); | |
295 fg += weight * SkGetPackedG32(c); | |
296 fb += weight * SkGetPackedB32(c); | |
297 fa += weight * SkGetPackedA32(c); | |
298 total_weight += weight; | |
299 } | |
300 fr = SkFixedDiv(fr, total_weight); | |
301 fg = SkFixedDiv(fg, total_weight); | |
302 fb = SkFixedDiv(fb, total_weight); | |
303 fa = SkFixedDiv(fa, total_weight); | |
304 | |
305 int a = SkClampMax(SkFixedRoundToInt(fa), 255); | |
306 int r = SkClampMax(SkFixedRoundToInt(fr), a); | |
307 int g = SkClampMax(SkFixedRoundToInt(fg), a); | |
308 int b = SkClampMax(SkFixedRoundToInt(fb), a); | |
309 | |
310 *dst->getAddr32(x,y) = SkPackARGB32(a, r, g, b); | |
311 } | |
312 } | |
313 } | |
314 | |
315 static void downScaleVert(const SkBitmap *src, SkBitmap *dst, float scale, SkBit mapFilter *filter) { | |
316 SkFixed *sums = SkNEW_ARRAY(SkFixed, dst->width() * dst->height() * 4); | |
317 SkFixed *weights = SkNEW_ARRAY(SkFixed, dst->width() * dst->height()); | |
318 | |
319 SkAutoTDeleteArray<SkFixed> ada1(sums); | |
320 SkAutoTDeleteArray<SkFixed> ada2(weights); | |
321 | |
322 memset(sums, 0, dst->width() * dst->height() * sizeof(SkFixed) * 4); | |
323 memset(weights, 0, dst->width() * dst->height() * sizeof(SkFixed)); | |
324 | |
325 for (int y = 0 ; y < src->height() ; y++) { | |
326 for (int x = 0 ; x < src->width() ; x++) { | |
327 // splat each source pixel into the destination image | |
328 float dy = (y + 0.5f) * scale; | |
329 int y0 = SkClampMax(int(ceil(dy-filter->width() + 0.5f)), dst->heigh t()-1); | |
330 int y1 = SkClampMax(int(floor(dy+filter->width() + 0.5f)), dst->heig ht()-1); | |
331 | |
332 SkPMColor c = *src->getAddr32(x,y); | |
333 | |
334 for (int dst_y = y0 ; dst_y <= y1 ; dst_y++) { | |
335 SkFixed weight = filter->lookup(dy - dst_y); | |
336 sums[4*(dst_y*dst->width() + x) + 0] += weight*SkGetPackedR32(c) ; | |
337 sums[4*(dst_y*dst->width() + x) + 1] += weight*SkGetPackedG32(c) ; | |
338 sums[4*(dst_y*dst->width() + x) + 2] += weight*SkGetPackedB32(c) ; | |
339 sums[4*(dst_y*dst->width() + x) + 3] += weight*SkGetPackedA32(c) ; | |
340 weights[dst_y*dst->width() + x] += weight; | |
341 } | |
342 } | |
343 } | |
344 | |
345 divideByWeights(sums, weights, dst); | |
346 } | |
347 | |
348 void SkBitmap::scale(SkBitmap *dst) const { | |
349 | |
350 SkBitmap horiz_temp; | |
351 | |
352 horiz_temp.setConfig(SkBitmap::kARGB_8888_Config, dst->width(), height()); | |
353 horiz_temp.allocPixels(); | |
354 | |
355 SkBitmapFilter *filter = allocateBitmapFilter(); | |
356 | |
357 float horiz_scale = float(dst->width()) / width(); | |
358 | |
359 if (horiz_scale == 1) { | |
360 this->copyPixelsTo(horiz_temp.getPixels(), getSize()); | |
361 } else if (horiz_scale > 1) { | |
362 upScaleHoriz(this, &horiz_temp, horiz_scale, filter); | |
363 } else if (horiz_scale < 1) { | |
364 downScaleHoriz(this, &horiz_temp, horiz_scale, filter); | |
365 } | |
366 | |
367 float vert_scale = float(dst->height()) / height(); | |
368 | |
369 if (vert_scale == 1) { | |
370 horiz_temp.copyPixelsTo(dst->getPixels(), dst->getSize()); | |
371 } else if (vert_scale > 1) { | |
372 upScaleVert(&horiz_temp, dst, vert_scale, filter); | |
373 } else if (vert_scale < 1) { | |
374 downScaleVert(&horiz_temp, dst, vert_scale, filter); | |
375 } | |
376 | |
377 SkDELETE(filter); | |
378 } | |
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