Paint.cpp revision 6ab90ed017fb52aac4493a2fac897299d345874f
1/* libs/android_runtime/android/graphics/Paint.cpp 2** 3** Copyright 2006, The Android Open Source Project 4** 5** Licensed under the Apache License, Version 2.0 (the "License"); 6** you may not use this file except in compliance with the License. 7** You may obtain a copy of the License at 8** 9** http://www.apache.org/licenses/LICENSE-2.0 10** 11** Unless required by applicable law or agreed to in writing, software 12** distributed under the License is distributed on an "AS IS" BASIS, 13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14** See the License for the specific language governing permissions and 15** limitations under the License. 16*/ 17 18#include "jni.h" 19#include "GraphicsJNI.h" 20#include <android_runtime/AndroidRuntime.h> 21 22#include "SkBlurDrawLooper.h" 23#include "SkColorFilter.h" 24#include "SkMaskFilter.h" 25#include "SkRasterizer.h" 26#include "SkShader.h" 27#include "SkTypeface.h" 28#include "SkXfermode.h" 29#include "unicode/ushape.h" 30#include "TextLayout.h" 31 32// temporary for debugging 33#include <Caches.h> 34#include <utils/Log.h> 35 36namespace android { 37 38struct JMetricsID { 39 jfieldID top; 40 jfieldID ascent; 41 jfieldID descent; 42 jfieldID bottom; 43 jfieldID leading; 44}; 45 46static jclass gFontMetrics_class; 47static JMetricsID gFontMetrics_fieldID; 48 49static jclass gFontMetricsInt_class; 50static JMetricsID gFontMetricsInt_fieldID; 51 52static void defaultSettingsForAndroid(SkPaint* paint) { 53 // looks best we decided 54 paint->setHinting(SkPaint::kSlight_Hinting); 55 // utf16 is required for java 56 paint->setTextEncoding(SkPaint::kUTF16_TextEncoding); 57} 58 59class SkPaintGlue { 60public: 61 enum MoveOpt { 62 AFTER, AT_OR_AFTER, BEFORE, AT_OR_BEFORE, AT 63 }; 64 65 static void finalizer(JNIEnv* env, jobject clazz, SkPaint* obj) { 66 delete obj; 67 } 68 69 static SkPaint* init(JNIEnv* env, jobject clazz) { 70 SkPaint* obj = new SkPaint(); 71 defaultSettingsForAndroid(obj); 72 return obj; 73 } 74 75 static SkPaint* intiWithPaint(JNIEnv* env, jobject clazz, SkPaint* paint) { 76 SkPaint* obj = new SkPaint(*paint); 77 return obj; 78 } 79 80 static void reset(JNIEnv* env, jobject clazz, SkPaint* obj) { 81 obj->reset(); 82 defaultSettingsForAndroid(obj); 83 } 84 85 static void assign(JNIEnv* env, jobject clazz, SkPaint* dst, const SkPaint* src) { 86 *dst = *src; 87 } 88 89 static jint getFlags(JNIEnv* env, jobject paint) { 90 NPE_CHECK_RETURN_ZERO(env, paint); 91 return GraphicsJNI::getNativePaint(env, paint)->getFlags(); 92 } 93 94 static void setFlags(JNIEnv* env, jobject paint, jint flags) { 95 NPE_CHECK_RETURN_VOID(env, paint); 96 GraphicsJNI::getNativePaint(env, paint)->setFlags(flags); 97 } 98 99 static void setAntiAlias(JNIEnv* env, jobject paint, jboolean aa) { 100 NPE_CHECK_RETURN_VOID(env, paint); 101 GraphicsJNI::getNativePaint(env, paint)->setAntiAlias(aa); 102 } 103 104 static void setLinearText(JNIEnv* env, jobject paint, jboolean linearText) { 105 NPE_CHECK_RETURN_VOID(env, paint); 106 GraphicsJNI::getNativePaint(env, paint)->setLinearText(linearText); 107 } 108 109 static void setSubpixelText(JNIEnv* env, jobject paint, jboolean subpixelText) { 110 NPE_CHECK_RETURN_VOID(env, paint); 111 GraphicsJNI::getNativePaint(env, paint)->setSubpixelText(subpixelText); 112 } 113 114 static void setUnderlineText(JNIEnv* env, jobject paint, jboolean underlineText) { 115 NPE_CHECK_RETURN_VOID(env, paint); 116 GraphicsJNI::getNativePaint(env, paint)->setUnderlineText(underlineText); 117 } 118 119 static void setStrikeThruText(JNIEnv* env, jobject paint, jboolean strikeThruText) { 120 NPE_CHECK_RETURN_VOID(env, paint); 121 GraphicsJNI::getNativePaint(env, paint)->setStrikeThruText(strikeThruText); 122 } 123 124 static void setFakeBoldText(JNIEnv* env, jobject paint, jboolean fakeBoldText) { 125 NPE_CHECK_RETURN_VOID(env, paint); 126 GraphicsJNI::getNativePaint(env, paint)->setFakeBoldText(fakeBoldText); 127 } 128 129 static void setFilterBitmap(JNIEnv* env, jobject paint, jboolean filterBitmap) { 130 NPE_CHECK_RETURN_VOID(env, paint); 131 GraphicsJNI::getNativePaint(env, paint)->setFilterBitmap(filterBitmap); 132 } 133 134 static void setDither(JNIEnv* env, jobject paint, jboolean dither) { 135 NPE_CHECK_RETURN_VOID(env, paint); 136 GraphicsJNI::getNativePaint(env, paint)->setDither(dither); 137 } 138 139 static jint getStyle(JNIEnv* env, jobject clazz, SkPaint* obj) { 140 return obj->getStyle(); 141 } 142 143 static void setStyle(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Style style) { 144 obj->setStyle(style); 145 } 146 147 static jint getColor(JNIEnv* env, jobject paint) { 148 NPE_CHECK_RETURN_ZERO(env, paint); 149 return GraphicsJNI::getNativePaint(env, paint)->getColor(); 150 } 151 152 static jint getAlpha(JNIEnv* env, jobject paint) { 153 NPE_CHECK_RETURN_ZERO(env, paint); 154 return GraphicsJNI::getNativePaint(env, paint)->getAlpha(); 155 } 156 157 static void setColor(JNIEnv* env, jobject paint, jint color) { 158 NPE_CHECK_RETURN_VOID(env, paint); 159 GraphicsJNI::getNativePaint(env, paint)->setColor(color); 160 } 161 162 static void setAlpha(JNIEnv* env, jobject paint, jint a) { 163 NPE_CHECK_RETURN_VOID(env, paint); 164 GraphicsJNI::getNativePaint(env, paint)->setAlpha(a); 165 } 166 167 static jfloat getStrokeWidth(JNIEnv* env, jobject paint) { 168 NPE_CHECK_RETURN_ZERO(env, paint); 169 return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeWidth()); 170 } 171 172 static void setStrokeWidth(JNIEnv* env, jobject paint, jfloat width) { 173 NPE_CHECK_RETURN_VOID(env, paint); 174 GraphicsJNI::getNativePaint(env, paint)->setStrokeWidth(SkFloatToScalar(width)); 175 } 176 177 static jfloat getStrokeMiter(JNIEnv* env, jobject paint) { 178 NPE_CHECK_RETURN_ZERO(env, paint); 179 return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getStrokeMiter()); 180 } 181 182 static void setStrokeMiter(JNIEnv* env, jobject paint, jfloat miter) { 183 NPE_CHECK_RETURN_VOID(env, paint); 184 GraphicsJNI::getNativePaint(env, paint)->setStrokeMiter(SkFloatToScalar(miter)); 185 } 186 187 static jint getStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj) { 188 return obj->getStrokeCap(); 189 } 190 191 static void setStrokeCap(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Cap cap) { 192 obj->setStrokeCap(cap); 193 } 194 195 static jint getStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj) { 196 return obj->getStrokeJoin(); 197 } 198 199 static void setStrokeJoin(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Join join) { 200 obj->setStrokeJoin(join); 201 } 202 203 static jboolean getFillPath(JNIEnv* env, jobject clazz, SkPaint* obj, SkPath* src, SkPath* dst) { 204 return obj->getFillPath(*src, dst); 205 } 206 207 static SkShader* setShader(JNIEnv* env, jobject clazz, SkPaint* obj, SkShader* shader) { 208 return obj->setShader(shader); 209 } 210 211 static SkColorFilter* setColorFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkColorFilter* filter) { 212 return obj->setColorFilter(filter); 213 } 214 215 static SkXfermode* setXfermode(JNIEnv* env, jobject clazz, SkPaint* obj, SkXfermode* xfermode) { 216 return obj->setXfermode(xfermode); 217 } 218 219 static SkPathEffect* setPathEffect(JNIEnv* env, jobject clazz, SkPaint* obj, SkPathEffect* effect) { 220 return obj->setPathEffect(effect); 221 } 222 223 static SkMaskFilter* setMaskFilter(JNIEnv* env, jobject clazz, SkPaint* obj, SkMaskFilter* maskfilter) { 224 return obj->setMaskFilter(maskfilter); 225 } 226 227 static SkTypeface* setTypeface(JNIEnv* env, jobject clazz, SkPaint* obj, SkTypeface* typeface) { 228 return obj->setTypeface(typeface); 229 } 230 231 static SkRasterizer* setRasterizer(JNIEnv* env, jobject clazz, SkPaint* obj, SkRasterizer* rasterizer) { 232 return obj->setRasterizer(rasterizer); 233 } 234 235 static jint getTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj) { 236 return obj->getTextAlign(); 237 } 238 239 static void setTextAlign(JNIEnv* env, jobject clazz, SkPaint* obj, SkPaint::Align align) { 240 obj->setTextAlign(align); 241 } 242 243 static jfloat getTextSize(JNIEnv* env, jobject paint) { 244 NPE_CHECK_RETURN_ZERO(env, paint); 245 return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSize()); 246 } 247 248 static void setTextSize(JNIEnv* env, jobject paint, jfloat textSize) { 249 NPE_CHECK_RETURN_VOID(env, paint); 250 GraphicsJNI::getNativePaint(env, paint)->setTextSize(SkFloatToScalar(textSize)); 251 } 252 253 static jfloat getTextScaleX(JNIEnv* env, jobject paint) { 254 NPE_CHECK_RETURN_ZERO(env, paint); 255 return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextScaleX()); 256 } 257 258 static void setTextScaleX(JNIEnv* env, jobject paint, jfloat scaleX) { 259 NPE_CHECK_RETURN_VOID(env, paint); 260 GraphicsJNI::getNativePaint(env, paint)->setTextScaleX(SkFloatToScalar(scaleX)); 261 } 262 263 static jfloat getTextSkewX(JNIEnv* env, jobject paint) { 264 NPE_CHECK_RETURN_ZERO(env, paint); 265 return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSkewX()); 266 } 267 268 static void setTextSkewX(JNIEnv* env, jobject paint, jfloat skewX) { 269 NPE_CHECK_RETURN_VOID(env, paint); 270 GraphicsJNI::getNativePaint(env, paint)->setTextSkewX(SkFloatToScalar(skewX)); 271 } 272 273 static jfloat ascent(JNIEnv* env, jobject paint) { 274 NPE_CHECK_RETURN_ZERO(env, paint); 275 SkPaint::FontMetrics metrics; 276 (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics); 277 return SkScalarToFloat(metrics.fAscent); 278 } 279 280 static jfloat descent(JNIEnv* env, jobject paint) { 281 NPE_CHECK_RETURN_ZERO(env, paint); 282 SkPaint::FontMetrics metrics; 283 (void)GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics); 284 return SkScalarToFloat(metrics.fDescent); 285 } 286 287 static jfloat getFontMetrics(JNIEnv* env, jobject paint, jobject metricsObj) { 288 NPE_CHECK_RETURN_ZERO(env, paint); 289 SkPaint::FontMetrics metrics; 290 SkScalar spacing = GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics); 291 292 if (metricsObj) { 293 SkASSERT(env->IsInstanceOf(metricsObj, gFontMetrics_class)); 294 env->SetFloatField(metricsObj, gFontMetrics_fieldID.top, SkScalarToFloat(metrics.fTop)); 295 env->SetFloatField(metricsObj, gFontMetrics_fieldID.ascent, SkScalarToFloat(metrics.fAscent)); 296 env->SetFloatField(metricsObj, gFontMetrics_fieldID.descent, SkScalarToFloat(metrics.fDescent)); 297 env->SetFloatField(metricsObj, gFontMetrics_fieldID.bottom, SkScalarToFloat(metrics.fBottom)); 298 env->SetFloatField(metricsObj, gFontMetrics_fieldID.leading, SkScalarToFloat(metrics.fLeading)); 299 } 300 return SkScalarToFloat(spacing); 301 } 302 303 static jint getFontMetricsInt(JNIEnv* env, jobject paint, jobject metricsObj) { 304 NPE_CHECK_RETURN_ZERO(env, paint); 305 SkPaint::FontMetrics metrics; 306 307 GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics); 308 int ascent = SkScalarRound(metrics.fAscent); 309 int descent = SkScalarRound(metrics.fDescent); 310 int leading = SkScalarRound(metrics.fLeading); 311 312 if (metricsObj) { 313 SkASSERT(env->IsInstanceOf(metricsObj, gFontMetricsInt_class)); 314 env->SetIntField(metricsObj, gFontMetricsInt_fieldID.top, SkScalarFloor(metrics.fTop)); 315 env->SetIntField(metricsObj, gFontMetricsInt_fieldID.ascent, ascent); 316 env->SetIntField(metricsObj, gFontMetricsInt_fieldID.descent, descent); 317 env->SetIntField(metricsObj, gFontMetricsInt_fieldID.bottom, SkScalarCeil(metrics.fBottom)); 318 env->SetIntField(metricsObj, gFontMetricsInt_fieldID.leading, leading); 319 } 320 return descent - ascent + leading; 321 } 322 323 static jfloat measureText_CII(JNIEnv* env, jobject jpaint, jcharArray text, int index, int count) { 324 NPE_CHECK_RETURN_ZERO(env, jpaint); 325 NPE_CHECK_RETURN_ZERO(env, text); 326 327 size_t textLength = env->GetArrayLength(text); 328 if ((index | count) < 0 || (size_t)(index + count) > textLength) { 329 doThrowAIOOBE(env); 330 return 0; 331 } 332 if (count == 0) { 333 return 0; 334 } 335 336 SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint); 337 const jchar* textArray = env->GetCharArrayElements(text, NULL); 338 jfloat result = 0; 339#if RTL_USE_HARFBUZZ 340 TextLayout::getTextRunAdvances(paint, textArray, index, count, textLength, 341 paint->getFlags(), NULL /* dont need all advances */, result); 342#else 343 // we double count, since measureText wants a byteLength 344 SkScalar width = paint->measureText(textArray + index, count << 1); 345 result = SkScalarToFloat(width); 346#endif 347 env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT); 348 return result; 349 } 350 351 static jfloat measureText_StringII(JNIEnv* env, jobject jpaint, jstring text, int start, int end) { 352 NPE_CHECK_RETURN_ZERO(env, jpaint); 353 NPE_CHECK_RETURN_ZERO(env, text); 354 355 int count = end - start; 356 if ((start | count) < 0) { 357 doThrowAIOOBE(env); 358 return 0; 359 } 360 if (count == 0) { 361 return 0; 362 } 363 size_t textLength = env->GetStringLength(text); 364 if ((size_t)count > textLength) { 365 doThrowAIOOBE(env); 366 return 0; 367 } 368 369 const jchar* textArray = env->GetStringChars(text, NULL); 370 SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint); 371 jfloat width = 0; 372 373#if RTL_USE_HARFBUZZ 374 TextLayout::getTextRunAdvances(paint, textArray, start, count, end, 375 paint->getFlags(), NULL /* dont need all advances */, width); 376#else 377 378 width = SkScalarToFloat(paint->measureText(textArray + start, count << 1)); 379#endif 380 env->ReleaseStringChars(text, textArray); 381 return width; 382 } 383 384 static jfloat measureText_String(JNIEnv* env, jobject jpaint, jstring text) { 385 NPE_CHECK_RETURN_ZERO(env, jpaint); 386 NPE_CHECK_RETURN_ZERO(env, text); 387 388 size_t textLength = env->GetStringLength(text); 389 if (textLength == 0) { 390 return 0; 391 } 392 393 const jchar* textArray = env->GetStringChars(text, NULL); 394 SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint); 395 jfloat width = 0; 396 397#if RTL_USE_HARFBUZZ 398 TextLayout::getTextRunAdvances(paint, textArray, 0, textLength, textLength, 399 paint->getFlags(), NULL /* dont need all advances */, width); 400#else 401 width = SkScalarToFloat(paint->measureText(textArray, textLength << 1)); 402#endif 403 env->ReleaseStringChars(text, textArray); 404 return width; 405 } 406 407 static int dotextwidths(JNIEnv* env, SkPaint* paint, const jchar text[], int count, jfloatArray widths) { 408 NPE_CHECK_RETURN_ZERO(env, paint); 409 NPE_CHECK_RETURN_ZERO(env, text); 410 411 if (count < 0 || !widths) { 412 doThrowAIOOBE(env); 413 return 0; 414 } 415 if (count == 0) { 416 return 0; 417 } 418 size_t widthsLength = env->GetArrayLength(widths); 419 if ((size_t)count > widthsLength) { 420 doThrowAIOOBE(env); 421 return 0; 422 } 423 424 AutoJavaFloatArray autoWidths(env, widths, count); 425 jfloat* widthsArray = autoWidths.ptr(); 426 427#if RTL_USE_HARFBUZZ 428 jfloat totalAdvance; 429 430 TextLayout::getTextRunAdvances(paint, text, 0, count, count, 431 paint->getFlags(), widthsArray, totalAdvance); 432#else 433 SkScalar* scalarArray = (SkScalar*)widthsArray; 434 435 count = paint->getTextWidths(text, count << 1, scalarArray); 436 for (int i = 0; i < count; i++) { 437 widthsArray[i] = SkScalarToFloat(scalarArray[i]); 438 } 439#endif 440 return count; 441 } 442 443 static int getTextWidths___CII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text, int index, int count, jfloatArray widths) { 444 const jchar* textArray = env->GetCharArrayElements(text, NULL); 445 count = dotextwidths(env, paint, textArray + index, count, widths); 446 env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), 447 JNI_ABORT); 448 return count; 449 } 450 451 static int getTextWidths__StringII_F(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text, 452 int start, int end, jfloatArray widths) { 453 const jchar* textArray = env->GetStringChars(text, NULL); 454 int count = dotextwidths(env, paint, textArray + start, end - start, widths); 455 env->ReleaseStringChars(text, textArray); 456 return count; 457 } 458 459 static int doTextGlyphs(JNIEnv* env, SkPaint* paint, const jchar* text, jint start, jint count, 460 jint contextCount, jint flags, jcharArray glyphs) { 461 NPE_CHECK_RETURN_ZERO(env, paint); 462 NPE_CHECK_RETURN_ZERO(env, text); 463 464 if ((start | count | contextCount) < 0 || contextCount < count || !glyphs) { 465 doThrowAIOOBE(env); 466 return 0; 467 } 468 if (count == 0) { 469 return 0; 470 } 471 size_t glypthsLength = env->GetArrayLength(glyphs); 472 if ((size_t)count > glypthsLength) { 473 doThrowAIOOBE(env); 474 return 0; 475 } 476 477 jchar* glyphsArray = env->GetCharArrayElements(glyphs, NULL); 478 HB_ShaperItem shaperItem; 479 HB_FontRec font; 480 FontData fontData; 481 TextLayoutCacheValue::shapeWithHarfbuzz(&shaperItem, &font, &fontData, paint, text, 482 start, count, contextCount, flags); 483 484 int glyphCount = shaperItem.num_glyphs; 485 for (int i = 0; i < glyphCount; i++) { 486 glyphsArray[i] = (jchar) shaperItem.glyphs[i]; 487 } 488 env->ReleaseCharArrayElements(glyphs, glyphsArray, JNI_ABORT); 489 return glyphCount; 490 } 491 492 static int getTextGlyphs__StringIIIII_C(JNIEnv* env, jobject clazz, SkPaint* paint, 493 jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags, 494 jcharArray glyphs) { 495 const jchar* textArray = env->GetStringChars(text, NULL); 496 int count = doTextGlyphs(env, paint, textArray + contextStart, start - contextStart, 497 end - start, contextEnd - contextStart, flags, glyphs); 498 env->ReleaseStringChars(text, textArray); 499 return count; 500 } 501 502 static jfloat doTextRunAdvances(JNIEnv *env, SkPaint *paint, const jchar *text, 503 jint start, jint count, jint contextCount, jint flags, 504 jfloatArray advances, jint advancesIndex) { 505 NPE_CHECK_RETURN_ZERO(env, paint); 506 NPE_CHECK_RETURN_ZERO(env, text); 507 508 if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) { 509 doThrowAIOOBE(env); 510 return 0; 511 } 512 if (count == 0) { 513 return 0; 514 } 515 if (advances) { 516 size_t advancesLength = env->GetArrayLength(advances); 517 if ((size_t)count > advancesLength) { 518 doThrowAIOOBE(env); 519 return 0; 520 } 521 } 522 jfloat advancesArray[count]; 523 jfloat totalAdvance = 0; 524 525 TextLayout::getTextRunAdvances(paint, text, start, count, contextCount, flags, 526 advancesArray, totalAdvance); 527 528 if (advances != NULL) { 529 env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray); 530 } 531 return totalAdvance; 532 } 533 534 static jfloat doTextRunAdvancesICU(JNIEnv *env, SkPaint *paint, const jchar *text, 535 jint start, jint count, jint contextCount, jint flags, 536 jfloatArray advances, jint advancesIndex) { 537 NPE_CHECK_RETURN_ZERO(env, paint); 538 NPE_CHECK_RETURN_ZERO(env, text); 539 540 if ((start | count | contextCount | advancesIndex) < 0 || contextCount < count) { 541 doThrowAIOOBE(env); 542 return 0; 543 } 544 if (count == 0) { 545 return 0; 546 } 547 if (advances) { 548 size_t advancesLength = env->GetArrayLength(advances); 549 if ((size_t)count > advancesLength) { 550 doThrowAIOOBE(env); 551 return 0; 552 } 553 } 554 555 jfloat advancesArray[count]; 556 jfloat totalAdvance = 0; 557 558 TextLayout::getTextRunAdvancesICU(paint, text, start, count, contextCount, flags, 559 advancesArray, totalAdvance); 560 561 if (advances != NULL) { 562 env->SetFloatArrayRegion(advances, advancesIndex, count, advancesArray); 563 } 564 return totalAdvance; 565 } 566 567 static float getTextRunAdvances___CIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint, 568 jcharArray text, jint index, jint count, jint contextIndex, jint contextCount, 569 jint flags, jfloatArray advances, jint advancesIndex, jint reserved) { 570 jchar* textArray = env->GetCharArrayElements(text, NULL); 571 jfloat result = (reserved == 0) ? 572 doTextRunAdvances(env, paint, textArray + contextIndex, index - contextIndex, 573 count, contextCount, flags, advances, advancesIndex) : 574 doTextRunAdvancesICU(env, paint, textArray + contextIndex, index - contextIndex, 575 count, contextCount, flags, advances, advancesIndex); 576 env->ReleaseCharArrayElements(text, textArray, JNI_ABORT); 577 return result; 578 } 579 580 static float getTextRunAdvances__StringIIIII_FII(JNIEnv* env, jobject clazz, SkPaint* paint, 581 jstring text, jint start, jint end, jint contextStart, jint contextEnd, jint flags, 582 jfloatArray advances, jint advancesIndex, jint reserved) { 583 const jchar* textArray = env->GetStringChars(text, NULL); 584 jfloat result = (reserved == 0) ? 585 doTextRunAdvances(env, paint, textArray + contextStart, start - contextStart, 586 end - start, contextEnd - contextStart, flags, advances, advancesIndex) : 587 doTextRunAdvancesICU(env, paint, textArray + contextStart, start - contextStart, 588 end - start, contextEnd - contextStart, flags, advances, advancesIndex); 589 env->ReleaseStringChars(text, textArray); 590 return result; 591 } 592 593 static jint doTextRunCursor(JNIEnv *env, SkPaint* paint, const jchar *text, jint start, 594 jint count, jint flags, jint offset, jint opt) { 595#if RTL_USE_HARFBUZZ 596 jfloat scalarArray[count]; 597 jfloat totalAdvance = 0; 598 599 TextLayout::getTextRunAdvances(paint, text, start, count, count, flags, 600 scalarArray, totalAdvance); 601#else 602 SkScalar scalarArray[count]; 603 jchar buffer[count]; 604 605 // this is where we'd call harfbuzz 606 // for now we just use ushape.c and widths returned from skia 607 608 int widths; 609 if (flags & 0x1) { // rtl, call arabic shaping in case 610 UErrorCode status = U_ZERO_ERROR; 611 // Use fixed length since we need to keep start and count valid 612 u_shapeArabic(text + start, count, buffer, count, 613 U_SHAPE_LENGTH_FIXED_SPACES_NEAR | U_SHAPE_TEXT_DIRECTION_LOGICAL | 614 U_SHAPE_LETTERS_SHAPE | U_SHAPE_X_LAMALEF_SUB_ALTERNATE, &status); 615 // we shouldn't fail unless there's an out of memory condition, 616 // in which case we're hosed anyway 617 for (int i = 0; i < count; ++i) { 618 if (buffer[i] == 0xffff) { 619 buffer[i] = 0x200b; // zero-width-space for skia 620 } 621 } 622 widths = paint->getTextWidths(buffer, count << 1, scalarArray); 623 } else { 624 widths = paint->getTextWidths(text + start, count << 1, scalarArray); 625 } 626 627 if (widths < count) { 628 // Skia operates on code points, not code units, so surrogate pairs return only one 629 // value. Expand the result so we have one value per UTF-16 code unit. 630 631 // Note, skia's getTextWidth gets confused if it encounters a surrogate pair, 632 // leaving the remaining widths zero. Not nice. 633 const jchar *chars = text + start; 634 for (int i = count, p = widths - 1; --i > p;) { 635 if (chars[i] >= 0xdc00 && chars[i] < 0xe000 && 636 chars[i-1] >= 0xd800 && chars[i-1] < 0xdc00) { 637 scalarArray[i] = 0; 638 } else { 639 scalarArray[i] = scalarArray[--p]; 640 } 641 } 642 } 643#endif 644 jint pos = offset - start; 645 switch (opt) { 646 case AFTER: 647 if (pos < count) { 648 pos += 1; 649 } 650 // fall through 651 case AT_OR_AFTER: 652 while (pos < count && scalarArray[pos] == 0) { 653 ++pos; 654 } 655 break; 656 case BEFORE: 657 if (pos > 0) { 658 --pos; 659 } 660 // fall through 661 case AT_OR_BEFORE: 662 while (pos > 0 && scalarArray[pos] == 0) { 663 --pos; 664 } 665 break; 666 case AT: 667 default: 668 if (scalarArray[pos] == 0) { 669 pos = -1; 670 } 671 break; 672 } 673 674 if (pos != -1) { 675 pos += start; 676 } 677 678 return pos; 679 } 680 681 static jint getTextRunCursor___C(JNIEnv* env, jobject clazz, SkPaint* paint, jcharArray text, 682 jint contextStart, jint contextCount, jint flags, jint offset, jint cursorOpt) { 683 jchar* textArray = env->GetCharArrayElements(text, NULL); 684 jint result = doTextRunCursor(env, paint, textArray, contextStart, contextCount, flags, 685 offset, cursorOpt); 686 env->ReleaseCharArrayElements(text, textArray, JNI_ABORT); 687 return result; 688 } 689 690 static jint getTextRunCursor__String(JNIEnv* env, jobject clazz, SkPaint* paint, jstring text, 691 jint contextStart, jint contextEnd, jint flags, jint offset, jint cursorOpt) { 692 const jchar* textArray = env->GetStringChars(text, NULL); 693 jint result = doTextRunCursor(env, paint, textArray, contextStart, 694 contextEnd - contextStart, flags, offset, cursorOpt); 695 env->ReleaseStringChars(text, textArray); 696 return result; 697 } 698 699 static void getTextPath(JNIEnv* env, SkPaint* paint, const jchar* text, jint count, 700 jint bidiFlags, jfloat x, jfloat y, SkPath *path) { 701 TextLayout::getTextPath(paint, text, count, bidiFlags, x, y, path); 702 } 703 704 static void getTextPath___C(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags, 705 jcharArray text, int index, int count, jfloat x, jfloat y, SkPath* path) { 706 const jchar* textArray = env->GetCharArrayElements(text, NULL); 707 getTextPath(env, paint, textArray + index, count, bidiFlags, x, y, path); 708 env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), JNI_ABORT); 709 } 710 711 static void getTextPath__String(JNIEnv* env, jobject clazz, SkPaint* paint, jint bidiFlags, 712 jstring text, int start, int end, jfloat x, jfloat y, SkPath* path) { 713 const jchar* textArray = env->GetStringChars(text, NULL); 714 getTextPath(env, paint, textArray + start, end - start, bidiFlags, x, y, path); 715 env->ReleaseStringChars(text, textArray); 716 } 717 718 static void setShadowLayer(JNIEnv* env, jobject jpaint, jfloat radius, 719 jfloat dx, jfloat dy, int color) { 720 NPE_CHECK_RETURN_VOID(env, jpaint); 721 722 SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint); 723 if (radius <= 0) { 724 paint->setLooper(NULL); 725 } 726 else { 727 paint->setLooper(new SkBlurDrawLooper(SkFloatToScalar(radius), 728 SkFloatToScalar(dx), 729 SkFloatToScalar(dy), 730 (SkColor)color))->unref(); 731 } 732 } 733 734 static int breakText(JNIEnv* env, const SkPaint& paint, const jchar text[], 735 int count, float maxWidth, jfloatArray jmeasured, 736 SkPaint::TextBufferDirection tbd) { 737 SkASSERT(paint.getTextEncoding() == SkPaint::kUTF16_TextEncoding); 738 739 SkScalar measured; 740 size_t bytes = paint.breakText(text, count << 1, 741 SkFloatToScalar(maxWidth), &measured, tbd); 742 SkASSERT((bytes & 1) == 0); 743 744 if (jmeasured && env->GetArrayLength(jmeasured) > 0) { 745 AutoJavaFloatArray autoMeasured(env, jmeasured, 1); 746 jfloat* array = autoMeasured.ptr(); 747 array[0] = SkScalarToFloat(measured); 748 } 749 return bytes >> 1; 750 } 751 752 static int breakTextC(JNIEnv* env, jobject jpaint, jcharArray jtext, 753 int index, int count, float maxWidth, jfloatArray jmeasuredWidth) { 754 NPE_CHECK_RETURN_ZERO(env, jpaint); 755 NPE_CHECK_RETURN_ZERO(env, jtext); 756 757 SkPaint::TextBufferDirection tbd; 758 if (count < 0) { 759 tbd = SkPaint::kBackward_TextBufferDirection; 760 count = -count; 761 } 762 else { 763 tbd = SkPaint::kForward_TextBufferDirection; 764 } 765 766 if ((index < 0) || (index + count > env->GetArrayLength(jtext))) { 767 doThrowAIOOBE(env); 768 return 0; 769 } 770 771 SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint); 772 const jchar* text = env->GetCharArrayElements(jtext, NULL); 773 count = breakText(env, *paint, text + index, count, maxWidth, 774 jmeasuredWidth, tbd); 775 env->ReleaseCharArrayElements(jtext, const_cast<jchar*>(text), 776 JNI_ABORT); 777 return count; 778 } 779 780 static int breakTextS(JNIEnv* env, jobject jpaint, jstring jtext, 781 bool forwards, float maxWidth, jfloatArray jmeasuredWidth) { 782 NPE_CHECK_RETURN_ZERO(env, jpaint); 783 NPE_CHECK_RETURN_ZERO(env, jtext); 784 785 SkPaint::TextBufferDirection tbd = forwards ? 786 SkPaint::kForward_TextBufferDirection : 787 SkPaint::kBackward_TextBufferDirection; 788 789 SkPaint* paint = GraphicsJNI::getNativePaint(env, jpaint); 790 int count = env->GetStringLength(jtext); 791 const jchar* text = env->GetStringChars(jtext, NULL); 792 count = breakText(env, *paint, text, count, maxWidth, 793 jmeasuredWidth, tbd); 794 env->ReleaseStringChars(jtext, text); 795 return count; 796 } 797 798 static void doTextBounds(JNIEnv* env, const jchar* text, int count, 799 jobject bounds, const SkPaint& paint) 800 { 801 SkRect r; 802 SkIRect ir; 803 804 paint.measureText(text, count << 1, &r); 805 r.roundOut(&ir); 806 GraphicsJNI::irect_to_jrect(ir, env, bounds); 807 } 808 809 static void getStringBounds(JNIEnv* env, jobject, const SkPaint* paint, 810 jstring text, int start, int end, jobject bounds) 811 { 812 const jchar* textArray = env->GetStringChars(text, NULL); 813 doTextBounds(env, textArray + start, end - start, bounds, *paint); 814 env->ReleaseStringChars(text, textArray); 815 } 816 817 static void getCharArrayBounds(JNIEnv* env, jobject, const SkPaint* paint, 818 jcharArray text, int index, int count, jobject bounds) 819 { 820 const jchar* textArray = env->GetCharArrayElements(text, NULL); 821 doTextBounds(env, textArray + index, count, bounds, *paint); 822 env->ReleaseCharArrayElements(text, const_cast<jchar*>(textArray), 823 JNI_ABORT); 824 } 825 826}; 827 828static JNINativeMethod methods[] = { 829 {"finalizer", "(I)V", (void*) SkPaintGlue::finalizer}, 830 {"native_init","()I", (void*) SkPaintGlue::init}, 831 {"native_initWithPaint","(I)I", (void*) SkPaintGlue::intiWithPaint}, 832 {"native_reset","(I)V", (void*) SkPaintGlue::reset}, 833 {"native_set","(II)V", (void*) SkPaintGlue::assign}, 834 {"getFlags","()I", (void*) SkPaintGlue::getFlags}, 835 {"setFlags","(I)V", (void*) SkPaintGlue::setFlags}, 836 {"setAntiAlias","(Z)V", (void*) SkPaintGlue::setAntiAlias}, 837 {"setSubpixelText","(Z)V", (void*) SkPaintGlue::setSubpixelText}, 838 {"setLinearText","(Z)V", (void*) SkPaintGlue::setLinearText}, 839 {"setUnderlineText","(Z)V", (void*) SkPaintGlue::setUnderlineText}, 840 {"setStrikeThruText","(Z)V", (void*) SkPaintGlue::setStrikeThruText}, 841 {"setFakeBoldText","(Z)V", (void*) SkPaintGlue::setFakeBoldText}, 842 {"setFilterBitmap","(Z)V", (void*) SkPaintGlue::setFilterBitmap}, 843 {"setDither","(Z)V", (void*) SkPaintGlue::setDither}, 844 {"native_getStyle","(I)I", (void*) SkPaintGlue::getStyle}, 845 {"native_setStyle","(II)V", (void*) SkPaintGlue::setStyle}, 846 {"getColor","()I", (void*) SkPaintGlue::getColor}, 847 {"setColor","(I)V", (void*) SkPaintGlue::setColor}, 848 {"getAlpha","()I", (void*) SkPaintGlue::getAlpha}, 849 {"setAlpha","(I)V", (void*) SkPaintGlue::setAlpha}, 850 {"getStrokeWidth","()F", (void*) SkPaintGlue::getStrokeWidth}, 851 {"setStrokeWidth","(F)V", (void*) SkPaintGlue::setStrokeWidth}, 852 {"getStrokeMiter","()F", (void*) SkPaintGlue::getStrokeMiter}, 853 {"setStrokeMiter","(F)V", (void*) SkPaintGlue::setStrokeMiter}, 854 {"native_getStrokeCap","(I)I", (void*) SkPaintGlue::getStrokeCap}, 855 {"native_setStrokeCap","(II)V", (void*) SkPaintGlue::setStrokeCap}, 856 {"native_getStrokeJoin","(I)I", (void*) SkPaintGlue::getStrokeJoin}, 857 {"native_setStrokeJoin","(II)V", (void*) SkPaintGlue::setStrokeJoin}, 858 {"native_getFillPath","(III)Z", (void*) SkPaintGlue::getFillPath}, 859 {"native_setShader","(II)I", (void*) SkPaintGlue::setShader}, 860 {"native_setColorFilter","(II)I", (void*) SkPaintGlue::setColorFilter}, 861 {"native_setXfermode","(II)I", (void*) SkPaintGlue::setXfermode}, 862 {"native_setPathEffect","(II)I", (void*) SkPaintGlue::setPathEffect}, 863 {"native_setMaskFilter","(II)I", (void*) SkPaintGlue::setMaskFilter}, 864 {"native_setTypeface","(II)I", (void*) SkPaintGlue::setTypeface}, 865 {"native_setRasterizer","(II)I", (void*) SkPaintGlue::setRasterizer}, 866 {"native_getTextAlign","(I)I", (void*) SkPaintGlue::getTextAlign}, 867 {"native_setTextAlign","(II)V", (void*) SkPaintGlue::setTextAlign}, 868 {"getTextSize","()F", (void*) SkPaintGlue::getTextSize}, 869 {"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize}, 870 {"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX}, 871 {"setTextScaleX","(F)V", (void*) SkPaintGlue::setTextScaleX}, 872 {"getTextSkewX","()F", (void*) SkPaintGlue::getTextSkewX}, 873 {"setTextSkewX","(F)V", (void*) SkPaintGlue::setTextSkewX}, 874 {"ascent","()F", (void*) SkPaintGlue::ascent}, 875 {"descent","()F", (void*) SkPaintGlue::descent}, 876 {"getFontMetrics", "(Landroid/graphics/Paint$FontMetrics;)F", (void*)SkPaintGlue::getFontMetrics}, 877 {"getFontMetricsInt", "(Landroid/graphics/Paint$FontMetricsInt;)I", (void*)SkPaintGlue::getFontMetricsInt}, 878 {"native_measureText","([CII)F", (void*) SkPaintGlue::measureText_CII}, 879 {"native_measureText","(Ljava/lang/String;)F", (void*) SkPaintGlue::measureText_String}, 880 {"native_measureText","(Ljava/lang/String;II)F", (void*) SkPaintGlue::measureText_StringII}, 881 {"native_breakText","([CIIF[F)I", (void*) SkPaintGlue::breakTextC}, 882 {"native_breakText","(Ljava/lang/String;ZF[F)I", (void*) SkPaintGlue::breakTextS}, 883 {"native_getTextWidths","(I[CII[F)I", (void*) SkPaintGlue::getTextWidths___CII_F}, 884 {"native_getTextWidths","(ILjava/lang/String;II[F)I", (void*) SkPaintGlue::getTextWidths__StringII_F}, 885 {"native_getTextRunAdvances","(I[CIIIII[FII)F", 886 (void*) SkPaintGlue::getTextRunAdvances___CIIIII_FII}, 887 {"native_getTextRunAdvances","(ILjava/lang/String;IIIII[FII)F", 888 (void*) SkPaintGlue::getTextRunAdvances__StringIIIII_FII}, 889 890 891 {"native_getTextGlyphs","(ILjava/lang/String;IIIII[C)I", 892 (void*) SkPaintGlue::getTextGlyphs__StringIIIII_C}, 893 {"native_getTextRunCursor", "(I[CIIIII)I", (void*) SkPaintGlue::getTextRunCursor___C}, 894 {"native_getTextRunCursor", "(ILjava/lang/String;IIIII)I", 895 (void*) SkPaintGlue::getTextRunCursor__String}, 896 {"native_getTextPath","(II[CIIFFI)V", (void*) SkPaintGlue::getTextPath___C}, 897 {"native_getTextPath","(IILjava/lang/String;IIFFI)V", (void*) SkPaintGlue::getTextPath__String}, 898 {"nativeGetStringBounds", "(ILjava/lang/String;IILandroid/graphics/Rect;)V", 899 (void*) SkPaintGlue::getStringBounds }, 900 {"nativeGetCharArrayBounds", "(I[CIILandroid/graphics/Rect;)V", 901 (void*) SkPaintGlue::getCharArrayBounds }, 902 {"nSetShadowLayer", "(FFFI)V", (void*)SkPaintGlue::setShadowLayer} 903}; 904 905static jfieldID req_fieldID(jfieldID id) { 906 SkASSERT(id); 907 return id; 908} 909 910int register_android_graphics_Paint(JNIEnv* env) { 911 gFontMetrics_class = env->FindClass("android/graphics/Paint$FontMetrics"); 912 SkASSERT(gFontMetrics_class); 913 gFontMetrics_class = (jclass)env->NewGlobalRef(gFontMetrics_class); 914 915 gFontMetrics_fieldID.top = req_fieldID(env->GetFieldID(gFontMetrics_class, "top", "F")); 916 gFontMetrics_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetrics_class, "ascent", "F")); 917 gFontMetrics_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetrics_class, "descent", "F")); 918 gFontMetrics_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetrics_class, "bottom", "F")); 919 gFontMetrics_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetrics_class, "leading", "F")); 920 921 gFontMetricsInt_class = env->FindClass("android/graphics/Paint$FontMetricsInt"); 922 SkASSERT(gFontMetricsInt_class); 923 gFontMetricsInt_class = (jclass)env->NewGlobalRef(gFontMetricsInt_class); 924 925 gFontMetricsInt_fieldID.top = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "top", "I")); 926 gFontMetricsInt_fieldID.ascent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "ascent", "I")); 927 gFontMetricsInt_fieldID.descent = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "descent", "I")); 928 gFontMetricsInt_fieldID.bottom = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "bottom", "I")); 929 gFontMetricsInt_fieldID.leading = req_fieldID(env->GetFieldID(gFontMetricsInt_class, "leading", "I")); 930 931 int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Paint", methods, 932 sizeof(methods) / sizeof(methods[0])); 933 return result; 934} 935 936} 937