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 16 #include "Sk2DPathEffect.h" 17 18 static SkPath create_underline(const SkTDArray<SkScalar>& intersections, 19 SkScalar last, SkScalar finalPos, 20 SkScalar uPos, SkScalar uWidth, SkScalar textSize) { 21 SkPath underline; 22 SkScalar end = last; 23 for (int index = 0; index < intersections.count(); index += 2) { 24 SkScalar start = intersections[index] - uWidth;; 25 end = intersections[index + 1] + uWidth; 26 if (start > last && last + textSize / 12 < start) { 27 underline.moveTo(last, uPos); 28 underline.lineTo(start, uPos); 29 } 30 last = end; 31 } 32 if (end < finalPos) { 33 underline.moveTo(end, uPos); 34 underline.lineTo(finalPos, uPos); 35 } 36 return underline; 37 } 38 39 static void find_intercepts(const char* test, size_t len, SkScalar x, SkScalar y, 40 const SkPaint& paint, SkScalar uWidth, SkTDArray<SkScalar>* intersections) { 41 SkScalar uPos = y + uWidth; 42 SkScalar bounds[2] = { uPos - uWidth / 2, uPos + uWidth / 2 }; 43 int count = paint.getTextIntercepts(test, len, x, y, bounds, nullptr); 44 SkASSERT(!(count % 2)); 45 if (count) { 46 intersections->setCount(count); 47 paint.getTextIntercepts(test, len, x, y, bounds, intersections->begin()); 48 } 49 } 50 51 DEF_SIMPLE_GM(fancyunderline, canvas, 900, 1350) { 52 SkPaint paint; 53 paint.setAntiAlias(true); 54 const char* fam[] = { "sans-serif", "serif", "monospace" }; 55 const char test[] = "aAjJgGyY_|{-(~[,]qQ}pP}zZ"; 56 SkPoint textPt = { 10, 80 }; 57 for (size_t font = 0; font < SK_ARRAY_COUNT(fam); ++font) { 58 sk_tool_utils::set_portable_typeface(&paint, fam[font]); 59 for (SkScalar textSize = 100; textSize > 10; textSize -= 20) { 60 paint.setTextSize(textSize); 61 const SkScalar uWidth = textSize / 15; 62 paint.setStrokeWidth(uWidth); 63 paint.setStyle(SkPaint::kFill_Style); 64 canvas->drawText(test, sizeof(test) - 1, textPt.fX, textPt.fY, paint); 65 66 SkTDArray<SkScalar> intersections; 67 find_intercepts(test, sizeof(test) - 1, textPt.fX, textPt.fY, paint, uWidth, 68 &intersections); 69 70 SkScalar start = textPt.fX; 71 SkScalar end = paint.measureText(test, sizeof(test) - 1) + textPt.fX; 72 SkScalar uPos = textPt.fY + uWidth; 73 SkPath underline = create_underline(intersections, start, end, uPos, uWidth, textSize); 74 paint.setStyle(SkPaint::kStroke_Style); 75 canvas->drawPath(underline, paint); 76 77 canvas->translate(0, textSize * 1.3f); 78 } 79 canvas->translate(0, 60); 80 } 81 } 82 83 static void find_intercepts(const char* test, size_t len, const SkPoint* pos, const SkPaint& paint, 84 SkScalar uWidth, SkTDArray<SkScalar>* intersections) { 85 SkScalar uPos = pos[0].fY + uWidth; 86 SkScalar bounds[2] = { uPos - uWidth / 2, uPos + uWidth / 2 }; 87 int count = paint.getPosTextIntercepts(test, len, pos, bounds, nullptr); 88 SkASSERT(!(count % 2)); 89 if (count) { 90 intersections->setCount(count); 91 paint.getPosTextIntercepts(test, len, pos, bounds, intersections->begin()); 92 } 93 } 94 95 DEF_SIMPLE_GM(fancyposunderline, canvas, 900, 1350) { 96 SkPaint paint; 97 paint.setAntiAlias(true); 98 const char* fam[] = { "sans-serif", "serif", "monospace" }; 99 const char test[] = "aAjJgGyY_|{-(~[,]qQ}pP}zZ"; 100 SkPoint textPt = { 10, 80 }; 101 for (size_t font = 0; font < SK_ARRAY_COUNT(fam); ++font) { 102 sk_tool_utils::set_portable_typeface(&paint, fam[font]); 103 for (SkScalar textSize = 100; textSize > 10; textSize -= 20) { 104 paint.setTextSize(textSize); 105 const SkScalar uWidth = textSize / 15; 106 paint.setStrokeWidth(uWidth); 107 paint.setStyle(SkPaint::kFill_Style); 108 int widthCount = paint.getTextWidths(test, sizeof(test) - 1, nullptr); 109 SkTDArray<SkScalar> widths; 110 widths.setCount(widthCount); 111 (void) paint.getTextWidths(test, sizeof(test) - 1, widths.begin()); 112 SkTDArray<SkPoint> pos; 113 pos.setCount(widthCount); 114 SkScalar posX = textPt.fX; 115 for (int index = 0; index < widthCount; ++index) { 116 pos[index].fX = posX; 117 posX += widths[index]; 118 pos[index].fY = textPt.fY + (textSize / 25) * (index % 4); 119 } 120 canvas->drawPosText(test, sizeof(test) - 1, pos.begin(), paint); 121 122 SkTDArray<SkScalar> intersections; 123 find_intercepts(test, sizeof(test) - 1, pos.begin(), paint, uWidth, &intersections); 124 125 SkScalar start = textPt.fX; 126 SkScalar end = posX; 127 SkScalar uPos = textPt.fY + uWidth; 128 SkPath underline = create_underline(intersections, start, end, uPos, uWidth, textSize); 129 paint.setStyle(SkPaint::kStroke_Style); 130 canvas->drawPath(underline, paint); 131 132 canvas->translate(0, textSize * 1.3f); 133 } 134 canvas->translate(0, 60); 135 } 136 } 137 138 namespace { 139 140 sk_sp<SkTextBlob> MakeFancyBlob(const SkPaint& paint, const char* text) { 141 SkPaint blobPaint(paint); 142 143 const size_t textLen = strlen(text); 144 const int glyphCount = blobPaint.textToGlyphs(text, textLen, nullptr); 145 SkAutoTArray<SkGlyphID> glyphs(glyphCount); 146 blobPaint.textToGlyphs(text, textLen, glyphs.get()); 147 148 blobPaint.setTextEncoding(SkPaint::kGlyphID_TextEncoding); 149 const size_t glyphTextBytes = SkTo<uint32_t>(glyphCount) * sizeof(SkGlyphID); 150 const int widthCount = blobPaint.getTextWidths(glyphs.get(), glyphTextBytes, nullptr); 151 SkAssertResult(widthCount == glyphCount); 152 153 SkAutoTArray<SkScalar> widths(glyphCount); 154 blobPaint.getTextWidths(glyphs.get(), glyphTextBytes, widths.get()); 155 156 SkTextBlobBuilder blobBuilder; 157 int glyphIndex = 0; 158 SkScalar advance = 0; 159 160 // Default-positioned run. 161 { 162 const int defaultRunLen = glyphCount / 3; 163 const SkTextBlobBuilder::RunBuffer& buf = blobBuilder.allocRun(blobPaint, 164 defaultRunLen, 165 advance, 0); 166 memcpy(buf.glyphs, glyphs.get(), SkTo<uint32_t>(defaultRunLen) * sizeof(SkGlyphID)); 167 168 for (int i = 0; i < defaultRunLen; ++i) { 169 advance += widths[glyphIndex++]; 170 } 171 } 172 173 // Horizontal-positioned run. 174 { 175 const int horizontalRunLen = glyphCount / 3; 176 const SkTextBlobBuilder::RunBuffer& buf = blobBuilder.allocRunPosH(blobPaint, 177 horizontalRunLen, 178 0); 179 memcpy(buf.glyphs, glyphs.get() + glyphIndex, 180 SkTo<uint32_t>(horizontalRunLen) * sizeof(SkGlyphID)); 181 for (int i = 0; i < horizontalRunLen; ++i) { 182 buf.pos[i] = advance; 183 advance += widths[glyphIndex++]; 184 } 185 } 186 187 // Full-positioned run. 188 { 189 const int fullRunLen = glyphCount - glyphIndex; 190 const SkTextBlobBuilder::RunBuffer& buf = blobBuilder.allocRunPos(blobPaint, fullRunLen); 191 memcpy(buf.glyphs, glyphs.get() + glyphIndex, 192 SkTo<uint32_t>(fullRunLen) * sizeof(SkGlyphID)); 193 for (int i = 0; i < fullRunLen; ++i) { 194 buf.pos[i * 2 + 0] = advance; // x offset 195 buf.pos[i * 2 + 1] = 0; // y offset 196 advance += widths[glyphIndex++]; 197 } 198 } 199 200 return blobBuilder.make(); 201 } 202 203 } // anonymous ns 204 205 DEF_SIMPLE_GM(fancyblobunderline, canvas, 1480, 1380) { 206 SkPaint paint; 207 paint.setAntiAlias(true); 208 const char* fam[] = { "sans-serif", "serif", "monospace" }; 209 const char test[] = "aAjJgGyY_|{-(~[,]qQ}pP}zZ"; 210 const SkPoint blobOffset = { 10, 80 }; 211 212 for (size_t font = 0; font < SK_ARRAY_COUNT(fam); ++font) { 213 sk_tool_utils::set_portable_typeface(&paint, fam[font]); 214 for (SkScalar textSize = 100; textSize > 10; textSize -= 20) { 215 paint.setTextSize(textSize); 216 const SkScalar uWidth = textSize / 15; 217 paint.setStrokeWidth(uWidth); 218 paint.setStyle(SkPaint::kFill_Style); 219 220 sk_sp<SkTextBlob> blob = MakeFancyBlob(paint, test); 221 canvas->drawTextBlob(blob, blobOffset.x(), blobOffset.y(), paint); 222 223 const SkScalar uPos = uWidth; 224 const SkScalar bounds[2] = { uPos - uWidth / 2, uPos + uWidth / 2 }; 225 const int interceptCount = paint.getTextBlobIntercepts(blob.get(), bounds, nullptr); 226 SkASSERT(!(interceptCount % 2)); 227 228 SkTDArray<SkScalar> intercepts; 229 intercepts.setCount(interceptCount); 230 paint.getTextBlobIntercepts(blob.get(), bounds, intercepts.begin()); 231 232 const SkScalar start = blob->bounds().left(); 233 const SkScalar end = blob->bounds().right(); 234 SkPath underline = create_underline(intercepts, start, end, uPos, uWidth, textSize); 235 underline.offset(blobOffset.x(), blobOffset.y()); 236 paint.setStyle(SkPaint::kStroke_Style); 237 canvas->drawPath(underline, paint); 238 239 canvas->translate(0, textSize * 1.3f); 240 } 241 242 canvas->translate(0, 60); 243 } 244 } 245 246 DEF_SIMPLE_GM(fancyunderlinebars, canvas, 1500, 460) { 247 SkPaint paint; 248 paint.setAntiAlias(true); 249 const char test[] = " .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_"; 250 SkPoint textPt = { 10, 80 }; 251 sk_tool_utils::set_portable_typeface(&paint, "serif"); 252 for (SkScalar textSize = 100; textSize > 10; textSize -= 20) { 253 paint.setTextSize(textSize); 254 SkScalar uWidth = textSize / 15; 255 paint.setStrokeWidth(uWidth); 256 paint.setStyle(SkPaint::kFill_Style); 257 int widthCount = paint.getTextWidths(test, sizeof(test) - 1, nullptr); 258 SkTDArray<SkScalar> widths; 259 widths.setCount(widthCount); 260 (void) paint.getTextWidths(test, sizeof(test) - 1, widths.begin()); 261 SkTDArray<SkPoint> pos; 262 pos.setCount(widthCount); 263 SkScalar posX = textPt.fX; 264 pos[0] = textPt; 265 posX += widths[0]; 266 for (int index = 1; index < widthCount; ++index) { 267 pos[index].fX = posX; 268 posX += widths[index]; 269 pos[index].fY = textPt.fY - (textSize / 50) * (index / 5) + textSize / 50 * 4; 270 } 271 canvas->drawPosText(test, sizeof(test) - 1, pos.begin(), paint); 272 273 SkTDArray<SkScalar> intersections; 274 find_intercepts(test, sizeof(test) - 1, pos.begin(), paint, uWidth, &intersections); 275 276 SkScalar start = textPt.fX; 277 SkScalar end = posX; 278 SkScalar uPos = pos[0].fY + uWidth; 279 SkPath underline = create_underline(intersections, start, end, uPos, uWidth, textSize); 280 paint.setStyle(SkPaint::kStroke_Style); 281 canvas->drawPath(underline, paint); 282 canvas->translate(0, textSize * 1.3f); 283 } 284 } 285
