1/* 2 * Copyright 2011 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 "gm.h" 9#include "sk_tool_utils.h" 10#include "SkBlurMask.h" 11#include "SkBlurMaskFilter.h" 12#include "SkReadBuffer.h" 13#include "SkTextBlob.h" 14#include "SkWriteBuffer.h" 15#include "SkLayerRasterizer.h" 16 17static void r0(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) { 18 p.setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle, 19 SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(3)))); 20 rastBuilder->addLayer(p, SkIntToScalar(3), SkIntToScalar(3)); 21 22 p.setMaskFilter(nullptr); 23 p.setStyle(SkPaint::kStroke_Style); 24 p.setStrokeWidth(SK_Scalar1); 25 rastBuilder->addLayer(p); 26 27 p.setAlpha(0x11); 28 p.setStyle(SkPaint::kFill_Style); 29 p.setBlendMode(SkBlendMode::kSrc); 30 rastBuilder->addLayer(p); 31} 32 33static void r1(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) { 34 rastBuilder->addLayer(p); 35 36 p.setAlpha(0x40); 37 p.setBlendMode(SkBlendMode::kSrc); 38 p.setStyle(SkPaint::kStroke_Style); 39 p.setStrokeWidth(SK_Scalar1*2); 40 rastBuilder->addLayer(p); 41} 42 43static void r2(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) { 44 p.setStyle(SkPaint::kStrokeAndFill_Style); 45 p.setStrokeWidth(SK_Scalar1*4); 46 rastBuilder->addLayer(p); 47 48 p.setStyle(SkPaint::kStroke_Style); 49 p.setStrokeWidth(SK_Scalar1*3/2); 50 p.setBlendMode(SkBlendMode::kClear); 51 rastBuilder->addLayer(p); 52} 53 54static void r3(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) { 55 p.setStyle(SkPaint::kStroke_Style); 56 p.setStrokeWidth(SK_Scalar1*3); 57 rastBuilder->addLayer(p); 58 59 p.setAlpha(0x20); 60 p.setStyle(SkPaint::kFill_Style); 61 p.setBlendMode(SkBlendMode::kSrc); 62 rastBuilder->addLayer(p); 63} 64 65static void r4(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) { 66 p.setAlpha(0x60); 67 rastBuilder->addLayer(p, SkIntToScalar(3), SkIntToScalar(3)); 68 69 p.setAlpha(0xFF); 70 p.setBlendMode(SkBlendMode::kClear); 71 rastBuilder->addLayer(p, SK_Scalar1*3/2, SK_Scalar1*3/2); 72 73 p.setBlendMode(SkBlendMode::kSrcOver); 74 rastBuilder->addLayer(p); 75} 76 77#include "SkDiscretePathEffect.h" 78 79static void r5(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) { 80 rastBuilder->addLayer(p); 81 82 p.setPathEffect(SkDiscretePathEffect::Make(SK_Scalar1*4, SK_Scalar1*3)); 83 p.setBlendMode(SkBlendMode::kSrcOut); 84 rastBuilder->addLayer(p); 85} 86 87static void r6(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) { 88 rastBuilder->addLayer(p); 89 90 p.setAntiAlias(false); 91 SkLayerRasterizer::Builder rastBuilder2; 92 r5(&rastBuilder2, p); 93 p.setRasterizer(rastBuilder2.detach()); 94 p.setBlendMode(SkBlendMode::kClear); 95 rastBuilder->addLayer(p); 96} 97 98#include "Sk2DPathEffect.h" 99 100static sk_sp<SkPathEffect> MakeDotEffect(SkScalar radius, const SkMatrix& matrix) { 101 SkPath path; 102 path.addCircle(0, 0, radius); 103 return SkPath2DPathEffect::Make(matrix, path); 104} 105 106static void r7(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) { 107 SkMatrix lattice; 108 lattice.setScale(SK_Scalar1*6, SK_Scalar1*6, 0, 0); 109 lattice.postSkew(SK_Scalar1/3, 0, 0, 0); 110 p.setPathEffect(MakeDotEffect(SK_Scalar1*4, lattice)); 111 rastBuilder->addLayer(p); 112} 113 114static void r8(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) { 115 rastBuilder->addLayer(p); 116 117 SkMatrix lattice; 118 lattice.setScale(SK_Scalar1*6, SK_Scalar1*6, 0, 0); 119 lattice.postSkew(SK_Scalar1/3, 0, 0, 0); 120 p.setPathEffect(MakeDotEffect(SK_Scalar1*2, lattice)); 121 p.setBlendMode(SkBlendMode::kClear); 122 rastBuilder->addLayer(p); 123 124 p.setPathEffect(nullptr); 125 p.setBlendMode(SkBlendMode::kSrcOver); 126 p.setStyle(SkPaint::kStroke_Style); 127 p.setStrokeWidth(SK_Scalar1); 128 rastBuilder->addLayer(p); 129} 130 131static void r9(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) { 132 rastBuilder->addLayer(p); 133 134 SkMatrix lattice; 135 lattice.setScale(SK_Scalar1, SK_Scalar1*6, 0, 0); 136 lattice.postRotate(SkIntToScalar(30), 0, 0); 137 p.setPathEffect(SkLine2DPathEffect::Make(SK_Scalar1*2, lattice)); 138 p.setBlendMode(SkBlendMode::kClear); 139 rastBuilder->addLayer(p); 140 141 p.setPathEffect(nullptr); 142 p.setBlendMode(SkBlendMode::kSrcOver); 143 p.setStyle(SkPaint::kStroke_Style); 144 p.setStrokeWidth(SK_Scalar1); 145 rastBuilder->addLayer(p); 146} 147 148typedef void (*raster_proc)(SkLayerRasterizer::Builder*, SkPaint&); 149 150constexpr raster_proc gRastProcs[] = { 151 r0, r1, r2, r3, r4, r5, r6, r7, r8, r9 152}; 153 154static void apply_shader(SkPaint* paint, int index) { 155 raster_proc proc = gRastProcs[index]; 156 if (proc) { 157 SkPaint p; 158 SkLayerRasterizer::Builder rastBuilder; 159 160 p.setAntiAlias(true); 161 proc(&rastBuilder, p); 162 paint->setRasterizer(rastBuilder.detach()); 163 } 164 165#if 0 166 SkScalar dir[] = { SK_Scalar1, SK_Scalar1, SK_Scalar1 }; 167 paint->setMaskFilter(SkBlurMaskFilter::CreateEmboss(dir, SK_Scalar1/4, SkIntToScalar(4), SkIntToScalar(3)))->unref(); 168#endif 169 paint->setColor(SK_ColorBLUE); 170} 171 172DEF_SIMPLE_GM(texteffects, canvas, 460, 680) { 173 canvas->save(); 174 175 SkPaint paint; 176 paint.setAntiAlias(true); 177 sk_tool_utils::set_portable_typeface(&paint); 178 paint.setTextSize(SkIntToScalar(56)); 179 180 SkScalar x = SkIntToScalar(20); 181 SkScalar y = paint.getTextSize(); 182 183 SkString str("Hamburgefons"); 184 185 for (int i = 0; i < static_cast<int>(SK_ARRAY_COUNT(gRastProcs)); i++) { 186 apply_shader(&paint, i); 187 188 // paint.setMaskFilter(nullptr); 189 // paint.setColor(SK_ColorBLACK); 190 191 canvas->drawText(str.c_str(), str.size(), x, y, paint); 192 193 y += paint.getFontSpacing(); 194 } 195 196 canvas->restore(); 197} 198 199static SkPath create_underline(const SkTDArray<SkScalar>& intersections, 200 SkScalar last, SkScalar finalPos, 201 SkScalar uPos, SkScalar uWidth, SkScalar textSize) { 202 SkPath underline; 203 SkScalar end = last; 204 for (int index = 0; index < intersections.count(); index += 2) { 205 SkScalar start = intersections[index] - uWidth;; 206 end = intersections[index + 1] + uWidth; 207 if (start > last && last + textSize / 12 < start) { 208 underline.moveTo(last, uPos); 209 underline.lineTo(start, uPos); 210 } 211 last = end; 212 } 213 if (end < finalPos) { 214 underline.moveTo(end, uPos); 215 underline.lineTo(finalPos, uPos); 216 } 217 return underline; 218} 219 220static void find_intercepts(const char* test, size_t len, SkScalar x, SkScalar y, 221 const SkPaint& paint, SkScalar uWidth, SkTDArray<SkScalar>* intersections) { 222 SkScalar uPos = y + uWidth; 223 SkScalar bounds[2] = { uPos - uWidth / 2, uPos + uWidth / 2 }; 224 int count = paint.getTextIntercepts(test, len, x, y, bounds, nullptr); 225 SkASSERT(!(count % 2)); 226 if (count) { 227 intersections->setCount(count); 228 paint.getTextIntercepts(test, len, x, y, bounds, intersections->begin()); 229 } 230} 231 232DEF_SIMPLE_GM(fancyunderline, canvas, 900, 1350) { 233 SkPaint paint; 234 paint.setAntiAlias(true); 235 const char* fam[] = { "sans-serif", "serif", "monospace" }; 236 const char test[] = "aAjJgGyY_|{-(~[,]qQ}pP}zZ"; 237 SkPoint textPt = { 10, 80 }; 238 for (size_t font = 0; font < SK_ARRAY_COUNT(fam); ++font) { 239 sk_tool_utils::set_portable_typeface(&paint, fam[font]); 240 for (SkScalar textSize = 100; textSize > 10; textSize -= 20) { 241 paint.setTextSize(textSize); 242 const SkScalar uWidth = textSize / 15; 243 paint.setStrokeWidth(uWidth); 244 paint.setStyle(SkPaint::kFill_Style); 245 canvas->drawText(test, sizeof(test) - 1, textPt.fX, textPt.fY, paint); 246 247 SkTDArray<SkScalar> intersections; 248 find_intercepts(test, sizeof(test) - 1, textPt.fX, textPt.fY, paint, uWidth, 249 &intersections); 250 251 SkScalar start = textPt.fX; 252 SkScalar end = paint.measureText(test, sizeof(test) - 1) + textPt.fX; 253 SkScalar uPos = textPt.fY + uWidth; 254 SkPath underline = create_underline(intersections, start, end, uPos, uWidth, textSize); 255 paint.setStyle(SkPaint::kStroke_Style); 256 canvas->drawPath(underline, paint); 257 258 canvas->translate(0, textSize * 1.3f); 259 } 260 canvas->translate(0, 60); 261 } 262} 263 264static void find_intercepts(const char* test, size_t len, const SkPoint* pos, const SkPaint& paint, 265 SkScalar uWidth, SkTDArray<SkScalar>* intersections) { 266 SkScalar uPos = pos[0].fY + uWidth; 267 SkScalar bounds[2] = { uPos - uWidth / 2, uPos + uWidth / 2 }; 268 int count = paint.getPosTextIntercepts(test, len, pos, bounds, nullptr); 269 SkASSERT(!(count % 2)); 270 if (count) { 271 intersections->setCount(count); 272 paint.getPosTextIntercepts(test, len, pos, bounds, intersections->begin()); 273 } 274} 275 276DEF_SIMPLE_GM(fancyposunderline, canvas, 900, 1350) { 277 SkPaint paint; 278 paint.setAntiAlias(true); 279 const char* fam[] = { "sans-serif", "serif", "monospace" }; 280 const char test[] = "aAjJgGyY_|{-(~[,]qQ}pP}zZ"; 281 SkPoint textPt = { 10, 80 }; 282 for (size_t font = 0; font < SK_ARRAY_COUNT(fam); ++font) { 283 sk_tool_utils::set_portable_typeface(&paint, fam[font]); 284 for (SkScalar textSize = 100; textSize > 10; textSize -= 20) { 285 paint.setTextSize(textSize); 286 const SkScalar uWidth = textSize / 15; 287 paint.setStrokeWidth(uWidth); 288 paint.setStyle(SkPaint::kFill_Style); 289 int widthCount = paint.getTextWidths(test, sizeof(test) - 1, nullptr); 290 SkTDArray<SkScalar> widths; 291 widths.setCount(widthCount); 292 (void) paint.getTextWidths(test, sizeof(test) - 1, widths.begin()); 293 SkTDArray<SkPoint> pos; 294 pos.setCount(widthCount); 295 SkScalar posX = textPt.fX; 296 for (int index = 0; index < widthCount; ++index) { 297 pos[index].fX = posX; 298 posX += widths[index]; 299 pos[index].fY = textPt.fY + (textSize / 25) * (index % 4); 300 } 301 canvas->drawPosText(test, sizeof(test) - 1, pos.begin(), paint); 302 303 SkTDArray<SkScalar> intersections; 304 find_intercepts(test, sizeof(test) - 1, pos.begin(), paint, uWidth, &intersections); 305 306 SkScalar start = textPt.fX; 307 SkScalar end = posX; 308 SkScalar uPos = textPt.fY + uWidth; 309 SkPath underline = create_underline(intersections, start, end, uPos, uWidth, textSize); 310 paint.setStyle(SkPaint::kStroke_Style); 311 canvas->drawPath(underline, paint); 312 313 canvas->translate(0, textSize * 1.3f); 314 } 315 canvas->translate(0, 60); 316 } 317} 318 319namespace { 320 321sk_sp<SkTextBlob> MakeFancyBlob(const SkPaint& paint, const char* text) { 322 SkPaint blobPaint(paint); 323 324 const size_t textLen = strlen(text); 325 const int glyphCount = blobPaint.textToGlyphs(text, textLen, nullptr); 326 SkAutoTArray<SkGlyphID> glyphs(glyphCount); 327 blobPaint.textToGlyphs(text, textLen, glyphs.get()); 328 329 blobPaint.setTextEncoding(SkPaint::kGlyphID_TextEncoding); 330 const size_t glyphTextBytes = SkTo<uint32_t>(glyphCount) * sizeof(SkGlyphID); 331 const int widthCount = blobPaint.getTextWidths(glyphs.get(), glyphTextBytes, nullptr); 332 SkAssertResult(widthCount == glyphCount); 333 334 SkAutoTArray<SkScalar> widths(glyphCount); 335 blobPaint.getTextWidths(glyphs.get(), glyphTextBytes, widths.get()); 336 337 SkTextBlobBuilder blobBuilder; 338 int glyphIndex = 0; 339 SkScalar advance = 0; 340 341 // Default-positioned run. 342 { 343 const int defaultRunLen = glyphCount / 3; 344 const SkTextBlobBuilder::RunBuffer& buf = blobBuilder.allocRun(blobPaint, 345 defaultRunLen, 346 advance, 0); 347 memcpy(buf.glyphs, glyphs.get(), SkTo<uint32_t>(defaultRunLen) * sizeof(SkGlyphID)); 348 349 for (int i = 0; i < defaultRunLen; ++i) { 350 advance += widths[glyphIndex++]; 351 } 352 } 353 354 // Horizontal-positioned run. 355 { 356 const int horizontalRunLen = glyphCount / 3; 357 const SkTextBlobBuilder::RunBuffer& buf = blobBuilder.allocRunPosH(blobPaint, 358 horizontalRunLen, 359 0); 360 memcpy(buf.glyphs, glyphs.get() + glyphIndex, 361 SkTo<uint32_t>(horizontalRunLen) * sizeof(SkGlyphID)); 362 for (int i = 0; i < horizontalRunLen; ++i) { 363 buf.pos[i] = advance; 364 advance += widths[glyphIndex++]; 365 } 366 } 367 368 // Full-positioned run. 369 { 370 const int fullRunLen = glyphCount - glyphIndex; 371 const SkTextBlobBuilder::RunBuffer& buf = blobBuilder.allocRunPos(blobPaint, fullRunLen); 372 memcpy(buf.glyphs, glyphs.get() + glyphIndex, 373 SkTo<uint32_t>(fullRunLen) * sizeof(SkGlyphID)); 374 for (int i = 0; i < fullRunLen; ++i) { 375 buf.pos[i * 2 + 0] = advance; // x offset 376 buf.pos[i * 2 + 1] = 0; // y offset 377 advance += widths[glyphIndex++]; 378 } 379 } 380 381 return blobBuilder.make(); 382} 383 384} // anonymous ns 385 386DEF_SIMPLE_GM(fancyblobunderline, canvas, 1480, 1380) { 387 SkPaint paint; 388 paint.setAntiAlias(true); 389 const char* fam[] = { "sans-serif", "serif", "monospace" }; 390 const char test[] = "aAjJgGyY_|{-(~[,]qQ}pP}zZ"; 391 const SkPoint blobOffset = { 10, 80 }; 392 393 for (size_t font = 0; font < SK_ARRAY_COUNT(fam); ++font) { 394 sk_tool_utils::set_portable_typeface(&paint, fam[font]); 395 for (SkScalar textSize = 100; textSize > 10; textSize -= 20) { 396 paint.setTextSize(textSize); 397 const SkScalar uWidth = textSize / 15; 398 paint.setStrokeWidth(uWidth); 399 paint.setStyle(SkPaint::kFill_Style); 400 401 sk_sp<SkTextBlob> blob = MakeFancyBlob(paint, test); 402 canvas->drawTextBlob(blob, blobOffset.x(), blobOffset.y(), paint); 403 404 const SkScalar uPos = uWidth; 405 const SkScalar bounds[2] = { uPos - uWidth / 2, uPos + uWidth / 2 }; 406 const int interceptCount = paint.getTextBlobIntercepts(blob.get(), bounds, nullptr); 407 SkASSERT(!(interceptCount % 2)); 408 409 SkTDArray<SkScalar> intercepts; 410 intercepts.setCount(interceptCount); 411 paint.getTextBlobIntercepts(blob.get(), bounds, intercepts.begin()); 412 413 const SkScalar start = blob->bounds().left(); 414 const SkScalar end = blob->bounds().right(); 415 SkPath underline = create_underline(intercepts, start, end, uPos, uWidth, textSize); 416 underline.offset(blobOffset.x(), blobOffset.y()); 417 paint.setStyle(SkPaint::kStroke_Style); 418 canvas->drawPath(underline, paint); 419 420 canvas->translate(0, textSize * 1.3f); 421 } 422 423 canvas->translate(0, 60); 424 } 425} 426 427DEF_SIMPLE_GM(fancyunderlinebars, canvas, 1500, 460) { 428 SkPaint paint; 429 paint.setAntiAlias(true); 430 const char test[] = " .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_"; 431 SkPoint textPt = { 10, 80 }; 432 sk_tool_utils::set_portable_typeface(&paint, "serif"); 433 for (SkScalar textSize = 100; textSize > 10; textSize -= 20) { 434 paint.setTextSize(textSize); 435 SkScalar uWidth = textSize / 15; 436 paint.setStrokeWidth(uWidth); 437 paint.setStyle(SkPaint::kFill_Style); 438 int widthCount = paint.getTextWidths(test, sizeof(test) - 1, nullptr); 439 SkTDArray<SkScalar> widths; 440 widths.setCount(widthCount); 441 (void) paint.getTextWidths(test, sizeof(test) - 1, widths.begin()); 442 SkTDArray<SkPoint> pos; 443 pos.setCount(widthCount); 444 SkScalar posX = textPt.fX; 445 pos[0] = textPt; 446 posX += widths[0]; 447 for (int index = 1; index < widthCount; ++index) { 448 pos[index].fX = posX; 449 posX += widths[index]; 450 pos[index].fY = textPt.fY - (textSize / 50) * (index / 5) + textSize / 50 * 4; 451 } 452 canvas->drawPosText(test, sizeof(test) - 1, pos.begin(), paint); 453 454 SkTDArray<SkScalar> intersections; 455 find_intercepts(test, sizeof(test) - 1, pos.begin(), paint, uWidth, &intersections); 456 457 SkScalar start = textPt.fX; 458 SkScalar end = posX; 459 SkScalar uPos = pos[0].fY + uWidth; 460 SkPath underline = create_underline(intersections, start, end, uPos, uWidth, textSize); 461 paint.setStyle(SkPaint::kStroke_Style); 462 canvas->drawPath(underline, paint); 463 canvas->translate(0, textSize * 1.3f); 464 } 465} 466