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| 1 /* |
| 2 * Copyright 2016 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 "SkBlitter.h" |
| 9 #include "SkColor.h" |
| 10 #include "SkColorFilter.h" |
| 11 #include "SkPM4f.h" |
| 12 #include "SkPM4fPriv.h" |
| 13 #include "SkRasterPipeline.h" |
| 14 #include "SkShader.h" |
| 15 #include "SkSRGB.h" |
| 16 #include "SkXfermode.h" |
| 17 |
| 18 |
| 19 class SkRasterPipelineBlitter : public SkBlitter { |
| 20 public: |
| 21 static SkBlitter* Create(const SkPixmap&, const SkPaint&, SkTBlitterAllocato
r*); |
| 22 |
| 23 SkRasterPipelineBlitter(SkPixmap dst, |
| 24 SkRasterPipeline shader, |
| 25 SkRasterPipeline colorFilter, |
| 26 SkRasterPipeline xfermode, |
| 27 SkPM4f paintColor) |
| 28 : fDst(dst) |
| 29 , fShader(shader) |
| 30 , fColorFilter(colorFilter) |
| 31 , fXfermode(xfermode) |
| 32 , fPaintColor(paintColor) |
| 33 {} |
| 34 |
| 35 void blitH (int x, int y, int w) override; |
| 36 void blitAntiH(int x, int y, const SkAlpha[], const int16_t[]) override; |
| 37 void blitMask (const SkMask&, const SkIRect& clip) override; |
| 38 |
| 39 // TODO: The default implementations of the other blits look fine, |
| 40 // but some of them like blitV could probably benefit from custom |
| 41 // blits using something like a SkRasterPipeline::runFew() method. |
| 42 |
| 43 private: |
| 44 SkPixmap fDst; |
| 45 SkRasterPipeline fShader, fColorFilter, fXfermode; |
| 46 SkPM4f fPaintColor; |
| 47 |
| 48 typedef SkBlitter INHERITED; |
| 49 }; |
| 50 |
| 51 SkBlitter* SkCreateRasterPipelineBlitter(const SkPixmap& dst, |
| 52 const SkPaint& paint, |
| 53 SkTBlitterAllocator* alloc) { |
| 54 return SkRasterPipelineBlitter::Create(dst, paint, alloc); |
| 55 } |
| 56 |
| 57 |
| 58 // The default shader produces a constant color (from the SkPaint). |
| 59 static void SK_VECTORCALL constant_color(SkRasterPipeline::Stage* st, size_t x, |
| 60 Sk4f r, Sk4f g, Sk4f b, Sk4f a, |
| 61 Sk4f dr, Sk4f dg, Sk4f db, Sk4f da) { |
| 62 auto color = st->ctx<const SkPM4f*>(); |
| 63 r = color->r(); |
| 64 g = color->g(); |
| 65 b = color->b(); |
| 66 a = color->a(); |
| 67 st->next(x, r,g,b,a, dr,dg,db,da); |
| 68 } |
| 69 |
| 70 // The default transfer mode is srcover, s' = s + d*(1-sa). |
| 71 static void SK_VECTORCALL srcover(SkRasterPipeline::Stage* st, size_t x, |
| 72 Sk4f r, Sk4f g, Sk4f b, Sk4f a, |
| 73 Sk4f dr, Sk4f dg, Sk4f db, Sk4f da) { |
| 74 auto A = 1.0f - a; |
| 75 r += dr*A; |
| 76 g += dg*A; |
| 77 b += db*A; |
| 78 a += da*A; |
| 79 st->next(x, r,g,b,a, dr,dg,db,da); |
| 80 } |
| 81 |
| 82 static Sk4f lerp(const Sk4f& from, const Sk4f& to, const Sk4f& cov) { |
| 83 return from + (to-from)*cov; |
| 84 } |
| 85 |
| 86 // s' = d(1-c) + sc, for a constant c. |
| 87 static void SK_VECTORCALL lerp_constant_float(SkRasterPipeline::Stage* st, size_
t x, |
| 88 Sk4f r, Sk4f g, Sk4f b, Sk4f a
, |
| 89 Sk4f dr, Sk4f dg, Sk4f db, Sk4f da
) { |
| 90 Sk4f c = *st->ctx<const float*>(); |
| 91 |
| 92 r = lerp(dr, r, c); |
| 93 g = lerp(dg, g, c); |
| 94 b = lerp(db, b, c); |
| 95 a = lerp(da, a, c); |
| 96 st->next(x, r,g,b,a, dr,dg,db,da); |
| 97 } |
| 98 |
| 99 // s' = d(1-c) + sc, 4 pixels at a time for 8-bit coverage. |
| 100 static void SK_VECTORCALL lerp_a8(SkRasterPipeline::Stage* st, size_t x, |
| 101 Sk4f r, Sk4f g, Sk4f b, Sk4f a, |
| 102 Sk4f dr, Sk4f dg, Sk4f db, Sk4f da) { |
| 103 auto ptr = st->ctx<const uint8_t*>() + x; |
| 104 Sk4f c = SkNx_cast<float>(Sk4b::Load(ptr)) * (1/255.0f); |
| 105 |
| 106 r = lerp(dr, r, c); |
| 107 g = lerp(dg, g, c); |
| 108 b = lerp(db, b, c); |
| 109 a = lerp(da, a, c); |
| 110 st->next(x, r,g,b,a, dr,dg,db,da); |
| 111 } |
| 112 |
| 113 // Tail variant of lerp_a8() handling 1 pixel at a time. |
| 114 static void SK_VECTORCALL lerp_a8_1(SkRasterPipeline::Stage* st, size_t x, |
| 115 Sk4f r, Sk4f g, Sk4f b, Sk4f a, |
| 116 Sk4f dr, Sk4f dg, Sk4f db, Sk4f da) { |
| 117 auto ptr = st->ctx<const uint8_t*>() + x; |
| 118 Sk4f c = *ptr * (1/255.0f); |
| 119 |
| 120 r = lerp(dr, r, c); |
| 121 g = lerp(dg, g, c); |
| 122 b = lerp(db, b, c); |
| 123 a = lerp(da, a, c); |
| 124 st->next(x, r,g,b,a, dr,dg,db,da); |
| 125 } |
| 126 |
| 127 static void upscale_lcd16(const Sk4h& lcd16, Sk4f* r, Sk4f* g, Sk4f* b) { |
| 128 Sk4i _32_bit = SkNx_cast<int>(lcd16); |
| 129 |
| 130 *r = SkNx_cast<float>(_32_bit & SK_R16_MASK_IN_PLACE) * (1.0f / SK_R16_MASK_
IN_PLACE); |
| 131 *g = SkNx_cast<float>(_32_bit & SK_G16_MASK_IN_PLACE) * (1.0f / SK_G16_MASK_
IN_PLACE); |
| 132 *b = SkNx_cast<float>(_32_bit & SK_B16_MASK_IN_PLACE) * (1.0f / SK_B16_MASK_
IN_PLACE); |
| 133 } |
| 134 |
| 135 // s' = d(1-c) + sc, 4 pixels at a time for 565 coverage. |
| 136 static void SK_VECTORCALL lerp_lcd16(SkRasterPipeline::Stage* st, size_t x, |
| 137 Sk4f r, Sk4f g, Sk4f b, Sk4f a, |
| 138 Sk4f dr, Sk4f dg, Sk4f db, Sk4f da) { |
| 139 auto ptr = st->ctx<const uint16_t*>() + x; |
| 140 Sk4f cr, cg, cb; |
| 141 upscale_lcd16(Sk4h::Load(ptr), &cr, &cg, &cb); |
| 142 |
| 143 r = lerp(dr, r, cr); |
| 144 g = lerp(dg, g, cg); |
| 145 b = lerp(db, b, cb); |
| 146 a = 1.0f; |
| 147 st->next(x, r,g,b,a, dr,dg,db,da); |
| 148 } |
| 149 |
| 150 // Tail variant of lerp_lcd16() handling 1 pixel at a time. |
| 151 static void SK_VECTORCALL lerp_lcd16_1(SkRasterPipeline::Stage* st, size_t x, |
| 152 Sk4f r, Sk4f g, Sk4f b, Sk4f a, |
| 153 Sk4f dr, Sk4f dg, Sk4f db, Sk4f da) { |
| 154 auto ptr = st->ctx<const uint16_t*>() + x; |
| 155 Sk4f cr, cg, cb; |
| 156 upscale_lcd16({*ptr,0,0,0}, &cr, &cg, &cb); |
| 157 |
| 158 r = lerp(dr, r, cr); |
| 159 g = lerp(dg, g, cg); |
| 160 b = lerp(db, b, cb); |
| 161 a = 1.0f; |
| 162 st->next(x, r,g,b,a, dr,dg,db,da); |
| 163 } |
| 164 |
| 165 // Load 4 8-bit sRGB pixels from SkPMColor order to RGBA. |
| 166 static void SK_VECTORCALL load_d_srgb(SkRasterPipeline::Stage* st, size_t x, |
| 167 Sk4f r, Sk4f g, Sk4f b, Sk4f a, |
| 168 Sk4f dr, Sk4f dg, Sk4f db, Sk4f da) { |
| 169 auto ptr = st->ctx<const uint32_t*>() + x; |
| 170 |
| 171 dr = { sk_linear_from_srgb[(ptr[0] >> SK_R32_SHIFT) & 0xff], |
| 172 sk_linear_from_srgb[(ptr[1] >> SK_R32_SHIFT) & 0xff], |
| 173 sk_linear_from_srgb[(ptr[2] >> SK_R32_SHIFT) & 0xff], |
| 174 sk_linear_from_srgb[(ptr[3] >> SK_R32_SHIFT) & 0xff] }; |
| 175 |
| 176 dg = { sk_linear_from_srgb[(ptr[0] >> SK_G32_SHIFT) & 0xff], |
| 177 sk_linear_from_srgb[(ptr[1] >> SK_G32_SHIFT) & 0xff], |
| 178 sk_linear_from_srgb[(ptr[2] >> SK_G32_SHIFT) & 0xff], |
| 179 sk_linear_from_srgb[(ptr[3] >> SK_G32_SHIFT) & 0xff] }; |
| 180 |
| 181 db = { sk_linear_from_srgb[(ptr[0] >> SK_B32_SHIFT) & 0xff], |
| 182 sk_linear_from_srgb[(ptr[1] >> SK_B32_SHIFT) & 0xff], |
| 183 sk_linear_from_srgb[(ptr[2] >> SK_B32_SHIFT) & 0xff], |
| 184 sk_linear_from_srgb[(ptr[3] >> SK_B32_SHIFT) & 0xff] }; |
| 185 |
| 186 // TODO: this >> doesn't really need mask if we make it logical instead of a
rithmetic. |
| 187 da = SkNx_cast<float>((Sk4i::Load(ptr) >> SK_A32_SHIFT) & 0xff) * (1/255.0f)
; |
| 188 |
| 189 st->next(x, r,g,b,a, dr,dg,db,da); |
| 190 } |
| 191 |
| 192 // Tail variant of load_d_srgb() handling 1 pixel at a time. |
| 193 static void SK_VECTORCALL load_d_srgb_1(SkRasterPipeline::Stage* st, size_t x, |
| 194 Sk4f r, Sk4f g, Sk4f b, Sk4f a, |
| 195 Sk4f dr, Sk4f dg, Sk4f db, Sk4f da) { |
| 196 auto ptr = st->ctx<const uint32_t*>() + x; |
| 197 |
| 198 dr = { sk_linear_from_srgb[(*ptr >> SK_R32_SHIFT) & 0xff], 0,0,0 }; |
| 199 dg = { sk_linear_from_srgb[(*ptr >> SK_G32_SHIFT) & 0xff], 0,0,0 }; |
| 200 db = { sk_linear_from_srgb[(*ptr >> SK_B32_SHIFT) & 0xff], 0,0,0 }; |
| 201 da = { (1/255.0f) * (*ptr >> SK_A32_SHIFT) , 0,0,0 }; |
| 202 |
| 203 st->next(x, r,g,b,a, dr,dg,db,da); |
| 204 } |
| 205 |
| 206 // Write out 4 pixels as 8-bit SkPMColor-order sRGB. |
| 207 static void SK_VECTORCALL store_srgb(SkRasterPipeline::Stage* st, size_t x, |
| 208 Sk4f r, Sk4f g, Sk4f b, Sk4f a, |
| 209 Sk4f dr, Sk4f dg, Sk4f db, Sk4f da) { |
| 210 auto dst = st->ctx<uint32_t*>() + x; |
| 211 ( sk_linear_to_srgb(r) << SK_R32_SHIFT |
| 212 | sk_linear_to_srgb(g) << SK_G32_SHIFT |
| 213 | sk_linear_to_srgb(b) << SK_B32_SHIFT |
| 214 | Sk4f_round(255.0f*a) << SK_A32_SHIFT).store(dst); |
| 215 } |
| 216 |
| 217 // Tail variant of store_srgb() handling 1 pixel at a time. |
| 218 static void SK_VECTORCALL store_srgb_1(SkRasterPipeline::Stage* st, size_t x, |
| 219 Sk4f r, Sk4f g, Sk4f b, Sk4f a, |
| 220 Sk4f dr, Sk4f dg, Sk4f db, Sk4f da) { |
| 221 auto dst = st->ctx<uint32_t*>() + x; |
| 222 *dst = Sk4f_toS32(swizzle_rb_if_bgra({ r[0], g[0], b[0], a[0] })); |
| 223 } |
| 224 |
| 225 |
| 226 template <typename Effect> |
| 227 static bool append_effect_stages(const Effect* effect, SkRasterPipeline* pipelin
e) { |
| 228 return !effect || effect->appendStages(pipeline); |
| 229 } |
| 230 |
| 231 |
| 232 SkBlitter* SkRasterPipelineBlitter::Create(const SkPixmap& dst, |
| 233 const SkPaint& paint, |
| 234 SkTBlitterAllocator* alloc) { |
| 235 if (!dst.info().gammaCloseToSRGB()) { |
| 236 return nullptr; // TODO: f16, etc. |
| 237 } |
| 238 if (paint.getShader()) { |
| 239 return nullptr; // TODO: need to work out how shaders and their context
s work |
| 240 } |
| 241 |
| 242 SkRasterPipeline shader, colorFilter, xfermode; |
| 243 if (!append_effect_stages(paint.getColorFilter(), &colorFilter) || |
| 244 !append_effect_stages(paint.getXfermode(), &xfermode )) { |
| 245 return nullptr; |
| 246 } |
| 247 |
| 248 auto blitter = alloc->createT<SkRasterPipelineBlitter>( |
| 249 dst, |
| 250 shader, colorFilter, xfermode, |
| 251 SkColor4f::FromColor(paint.getColor()).premul()); |
| 252 |
| 253 if (!paint.getShader()) { |
| 254 blitter->fShader.append(constant_color, &blitter->fPaintColor); |
| 255 } |
| 256 if (!paint.getXfermode()) { |
| 257 blitter->fXfermode.append(srcover); |
| 258 } |
| 259 |
| 260 return blitter; |
| 261 } |
| 262 |
| 263 void SkRasterPipelineBlitter::blitH(int x, int y, int w) { |
| 264 auto dst = fDst.writable_addr(0,y); |
| 265 |
| 266 SkRasterPipeline p; |
| 267 p.extend(fShader); |
| 268 p.extend(fColorFilter); |
| 269 p.append(load_d_srgb, load_d_srgb_1, dst); |
| 270 p.extend(fXfermode); |
| 271 p.append(store_srgb, store_srgb_1, dst); |
| 272 |
| 273 p.run(x, w); |
| 274 } |
| 275 |
| 276 void SkRasterPipelineBlitter::blitAntiH(int x, int y, const SkAlpha aa[], const
int16_t runs[]) { |
| 277 auto dst = fDst.writable_addr(0,y); |
| 278 float coverage; |
| 279 |
| 280 SkRasterPipeline p; |
| 281 p.extend(fShader); |
| 282 p.extend(fColorFilter); |
| 283 p.append(load_d_srgb, load_d_srgb_1, dst); |
| 284 p.extend(fXfermode); |
| 285 p.append(lerp_constant_float, &coverage); |
| 286 p.append(store_srgb, store_srgb_1, dst); |
| 287 |
| 288 for (int16_t run = *runs; run > 0; run = *runs) { |
| 289 coverage = *aa * (1/255.0f); |
| 290 p.run(x, run); |
| 291 |
| 292 x += run; |
| 293 runs += run; |
| 294 aa += run; |
| 295 } |
| 296 } |
| 297 |
| 298 void SkRasterPipelineBlitter::blitMask(const SkMask& mask, const SkIRect& clip)
{ |
| 299 if (mask.fFormat == SkMask::kBW_Format) { |
| 300 // TODO: native BW masks? |
| 301 return INHERITED::blitMask(mask, clip); |
| 302 } |
| 303 |
| 304 int x = clip.left(); |
| 305 for (int y = clip.top(); y < clip.bottom(); y++) { |
| 306 auto dst = fDst.writable_addr(0,y); |
| 307 |
| 308 SkRasterPipeline p; |
| 309 p.extend(fShader); |
| 310 p.extend(fColorFilter); |
| 311 p.append(load_d_srgb, load_d_srgb_1, dst); |
| 312 p.extend(fXfermode); |
| 313 switch (mask.fFormat) { |
| 314 case SkMask::kA8_Format: |
| 315 p.append(lerp_a8, lerp_a8_1, mask.getAddr8(x,y)-x); |
| 316 break; |
| 317 case SkMask::kLCD16_Format: |
| 318 p.append(lerp_lcd16, lerp_lcd16_1, mask.getAddrLCD16(x,y)-x); |
| 319 break; |
| 320 default: break; |
| 321 } |
| 322 p.append(store_srgb, store_srgb_1, dst); |
| 323 |
| 324 p.run(x, clip.width()); |
| 325 } |
| 326 } |
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