1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #define LOG_TAG "OpenGLRenderer" 18 #define ATRACE_TAG ATRACE_TAG_VIEW 19 20 #include <cutils/compiler.h> 21 22 #include <utils/JenkinsHash.h> 23 #include <utils/Trace.h> 24 25 #include <SkGlyph.h> 26 #include <SkGlyphCache.h> 27 #include <SkUtils.h> 28 29 #include "FontUtil.h" 30 #include "Font.h" 31 #include "../Debug.h" 32 #include "../FontRenderer.h" 33 #include "../PixelBuffer.h" 34 #include "../Properties.h" 35 36 namespace android { 37 namespace uirenderer { 38 39 /////////////////////////////////////////////////////////////////////////////// 40 // Font 41 /////////////////////////////////////////////////////////////////////////////// 42 43 Font::Font(FontRenderer* state, const Font::FontDescription& desc) : 44 mState(state), mDescription(desc) { 45 } 46 47 Font::FontDescription::FontDescription(const SkPaint* paint, const mat4& matrix) { 48 mFontId = SkTypeface::UniqueID(paint->getTypeface()); 49 mFontSize = paint->getTextSize(); 50 mFlags = 0; 51 if (paint->isFakeBoldText()) { 52 mFlags |= Font::kFakeBold; 53 } 54 mItalicStyle = paint->getTextSkewX(); 55 mScaleX = paint->getTextScaleX(); 56 mStyle = paint->getStyle(); 57 mStrokeWidth = paint->getStrokeWidth(); 58 mAntiAliasing = paint->isAntiAlias(); 59 mHinting = paint->getHinting(); 60 mLookupTransform.reset(); 61 mLookupTransform[SkMatrix::kMScaleX] = roundf(fmaxf(1.0f, matrix[mat4::kScaleX])); 62 mLookupTransform[SkMatrix::kMScaleY] = roundf(fmaxf(1.0f, matrix[mat4::kScaleY])); 63 if (!mLookupTransform.invert(&mInverseLookupTransform)) { 64 ALOGW("Could not query the inverse lookup transform for this font"); 65 } 66 } 67 68 Font::~Font() { 69 mState->removeFont(this); 70 71 for (uint32_t i = 0; i < mCachedGlyphs.size(); i++) { 72 delete mCachedGlyphs.valueAt(i); 73 } 74 } 75 76 hash_t Font::FontDescription::hash() const { 77 uint32_t hash = JenkinsHashMix(0, mFontId); 78 hash = JenkinsHashMix(hash, android::hash_type(mFontSize)); 79 hash = JenkinsHashMix(hash, android::hash_type(mFlags)); 80 hash = JenkinsHashMix(hash, android::hash_type(mItalicStyle)); 81 hash = JenkinsHashMix(hash, android::hash_type(mScaleX)); 82 hash = JenkinsHashMix(hash, android::hash_type(mStyle)); 83 hash = JenkinsHashMix(hash, android::hash_type(mStrokeWidth)); 84 hash = JenkinsHashMix(hash, int(mAntiAliasing)); 85 hash = JenkinsHashMix(hash, android::hash_type(mHinting)); 86 hash = JenkinsHashMix(hash, android::hash_type(mLookupTransform[SkMatrix::kMScaleX])); 87 hash = JenkinsHashMix(hash, android::hash_type(mLookupTransform[SkMatrix::kMScaleY])); 88 return JenkinsHashWhiten(hash); 89 } 90 91 int Font::FontDescription::compare(const Font::FontDescription& lhs, 92 const Font::FontDescription& rhs) { 93 int deltaInt = int(lhs.mFontId) - int(rhs.mFontId); 94 if (deltaInt != 0) return deltaInt; 95 96 if (lhs.mFontSize < rhs.mFontSize) return -1; 97 if (lhs.mFontSize > rhs.mFontSize) return +1; 98 99 if (lhs.mItalicStyle < rhs.mItalicStyle) return -1; 100 if (lhs.mItalicStyle > rhs.mItalicStyle) return +1; 101 102 deltaInt = int(lhs.mFlags) - int(rhs.mFlags); 103 if (deltaInt != 0) return deltaInt; 104 105 if (lhs.mScaleX < rhs.mScaleX) return -1; 106 if (lhs.mScaleX > rhs.mScaleX) return +1; 107 108 deltaInt = int(lhs.mStyle) - int(rhs.mStyle); 109 if (deltaInt != 0) return deltaInt; 110 111 if (lhs.mStrokeWidth < rhs.mStrokeWidth) return -1; 112 if (lhs.mStrokeWidth > rhs.mStrokeWidth) return +1; 113 114 deltaInt = int(lhs.mAntiAliasing) - int(rhs.mAntiAliasing); 115 if (deltaInt != 0) return deltaInt; 116 117 deltaInt = int(lhs.mHinting) - int(rhs.mHinting); 118 if (deltaInt != 0) return deltaInt; 119 120 if (lhs.mLookupTransform[SkMatrix::kMScaleX] < 121 rhs.mLookupTransform[SkMatrix::kMScaleX]) return -1; 122 if (lhs.mLookupTransform[SkMatrix::kMScaleX] > 123 rhs.mLookupTransform[SkMatrix::kMScaleX]) return +1; 124 125 if (lhs.mLookupTransform[SkMatrix::kMScaleY] < 126 rhs.mLookupTransform[SkMatrix::kMScaleY]) return -1; 127 if (lhs.mLookupTransform[SkMatrix::kMScaleY] > 128 rhs.mLookupTransform[SkMatrix::kMScaleY]) return +1; 129 130 return 0; 131 } 132 133 void Font::invalidateTextureCache(CacheTexture* cacheTexture) { 134 for (uint32_t i = 0; i < mCachedGlyphs.size(); i++) { 135 CachedGlyphInfo* cachedGlyph = mCachedGlyphs.valueAt(i); 136 if (!cacheTexture || cachedGlyph->mCacheTexture == cacheTexture) { 137 cachedGlyph->mIsValid = false; 138 } 139 } 140 } 141 142 void Font::measureCachedGlyph(CachedGlyphInfo *glyph, int x, int y, 143 uint8_t* bitmap, uint32_t bitmapW, uint32_t bitmapH, Rect* bounds, const float* pos) { 144 int nPenX = x + glyph->mBitmapLeft; 145 int nPenY = y + glyph->mBitmapTop; 146 147 int width = (int) glyph->mBitmapWidth; 148 int height = (int) glyph->mBitmapHeight; 149 150 if (bounds->bottom > nPenY) { 151 bounds->bottom = nPenY; 152 } 153 if (bounds->left > nPenX) { 154 bounds->left = nPenX; 155 } 156 if (bounds->right < nPenX + width) { 157 bounds->right = nPenX + width; 158 } 159 if (bounds->top < nPenY + height) { 160 bounds->top = nPenY + height; 161 } 162 } 163 164 void Font::drawCachedGlyph(CachedGlyphInfo* glyph, int x, int y, 165 uint8_t* bitmap, uint32_t bitmapW, uint32_t bitmapH, Rect* bounds, const float* pos) { 166 float nPenX = x + glyph->mBitmapLeft; 167 float nPenY = y + glyph->mBitmapTop + glyph->mBitmapHeight; 168 169 float width = (float) glyph->mBitmapWidth; 170 float height = (float) glyph->mBitmapHeight; 171 172 float u1 = glyph->mBitmapMinU; 173 float u2 = glyph->mBitmapMaxU; 174 float v1 = glyph->mBitmapMinV; 175 float v2 = glyph->mBitmapMaxV; 176 177 mState->appendMeshQuad(nPenX, nPenY, u1, v2, 178 nPenX + width, nPenY, u2, v2, 179 nPenX + width, nPenY - height, u2, v1, 180 nPenX, nPenY - height, u1, v1, glyph->mCacheTexture); 181 } 182 183 void Font::drawCachedGlyphTransformed(CachedGlyphInfo* glyph, int x, int y, 184 uint8_t* bitmap, uint32_t bitmapW, uint32_t bitmapH, Rect* bounds, const float* pos) { 185 SkPoint p[4]; 186 p[0].iset(glyph->mBitmapLeft, glyph->mBitmapTop + glyph->mBitmapHeight); 187 p[1].iset(glyph->mBitmapLeft + glyph->mBitmapWidth, glyph->mBitmapTop + glyph->mBitmapHeight); 188 p[2].iset(glyph->mBitmapLeft + glyph->mBitmapWidth, glyph->mBitmapTop); 189 p[3].iset(glyph->mBitmapLeft, glyph->mBitmapTop); 190 191 mDescription.mInverseLookupTransform.mapPoints(p, 4); 192 193 p[0].offset(x, y); 194 p[1].offset(x, y); 195 p[2].offset(x, y); 196 p[3].offset(x, y); 197 198 float u1 = glyph->mBitmapMinU; 199 float u2 = glyph->mBitmapMaxU; 200 float v1 = glyph->mBitmapMinV; 201 float v2 = glyph->mBitmapMaxV; 202 203 mState->appendRotatedMeshQuad( 204 p[0].x(), p[0].y(), u1, v2, 205 p[1].x(), p[1].y(), u2, v2, 206 p[2].x(), p[2].y(), u2, v1, 207 p[3].x(), p[3].y(), u1, v1, glyph->mCacheTexture); 208 } 209 210 void Font::drawCachedGlyphBitmap(CachedGlyphInfo* glyph, int x, int y, uint8_t* bitmap, 211 uint32_t bitmapWidth, uint32_t bitmapHeight, Rect* bounds, const float* pos) { 212 int dstX = x + glyph->mBitmapLeft; 213 int dstY = y + glyph->mBitmapTop; 214 215 CacheTexture* cacheTexture = glyph->mCacheTexture; 216 217 uint32_t cacheWidth = cacheTexture->getWidth(); 218 uint32_t startY = glyph->mStartY * cacheWidth; 219 uint32_t endY = startY + (glyph->mBitmapHeight * cacheWidth); 220 221 PixelBuffer* pixelBuffer = cacheTexture->getPixelBuffer(); 222 const uint8_t* cacheBuffer = pixelBuffer->map(); 223 224 for (uint32_t cacheY = startY, bitmapY = dstY * bitmapWidth; cacheY < endY; 225 cacheY += cacheWidth, bitmapY += bitmapWidth) { 226 memcpy(&bitmap[bitmapY + dstX], &cacheBuffer[cacheY + glyph->mStartX], glyph->mBitmapWidth); 227 } 228 } 229 230 void Font::drawCachedGlyph(CachedGlyphInfo* glyph, float x, float hOffset, float vOffset, 231 SkPathMeasure& measure, SkPoint* position, SkVector* tangent) { 232 const float halfWidth = glyph->mBitmapWidth * 0.5f; 233 const float height = glyph->mBitmapHeight; 234 235 vOffset += glyph->mBitmapTop + height; 236 237 SkPoint destination[4]; 238 bool ok = measure.getPosTan(x + hOffset + glyph->mBitmapLeft + halfWidth, position, tangent); 239 if (!ok) { 240 ALOGW("The path for drawTextOnPath is empty or null"); 241 } 242 243 // Move along the tangent and offset by the normal 244 destination[0].set(-tangent->fX * halfWidth - tangent->fY * vOffset, 245 -tangent->fY * halfWidth + tangent->fX * vOffset); 246 destination[1].set(tangent->fX * halfWidth - tangent->fY * vOffset, 247 tangent->fY * halfWidth + tangent->fX * vOffset); 248 destination[2].set(destination[1].fX + tangent->fY * height, 249 destination[1].fY - tangent->fX * height); 250 destination[3].set(destination[0].fX + tangent->fY * height, 251 destination[0].fY - tangent->fX * height); 252 253 const float u1 = glyph->mBitmapMinU; 254 const float u2 = glyph->mBitmapMaxU; 255 const float v1 = glyph->mBitmapMinV; 256 const float v2 = glyph->mBitmapMaxV; 257 258 mState->appendRotatedMeshQuad( 259 position->x() + destination[0].x(), 260 position->y() + destination[0].y(), u1, v2, 261 position->x() + destination[1].x(), 262 position->y() + destination[1].y(), u2, v2, 263 position->x() + destination[2].x(), 264 position->y() + destination[2].y(), u2, v1, 265 position->x() + destination[3].x(), 266 position->y() + destination[3].y(), u1, v1, 267 glyph->mCacheTexture); 268 } 269 270 CachedGlyphInfo* Font::getCachedGlyph(SkPaint* paint, glyph_t textUnit, bool precaching) { 271 CachedGlyphInfo* cachedGlyph = mCachedGlyphs.valueFor(textUnit); 272 if (cachedGlyph) { 273 // Is the glyph still in texture cache? 274 if (!cachedGlyph->mIsValid) { 275 SkAutoGlyphCache autoCache(*paint, NULL, &mDescription.mLookupTransform); 276 const SkGlyph& skiaGlyph = GET_METRICS(autoCache.getCache(), textUnit); 277 updateGlyphCache(paint, skiaGlyph, autoCache.getCache(), cachedGlyph, precaching); 278 } 279 } else { 280 cachedGlyph = cacheGlyph(paint, textUnit, precaching); 281 } 282 283 return cachedGlyph; 284 } 285 286 void Font::render(SkPaint* paint, const char *text, uint32_t start, uint32_t len, 287 int numGlyphs, int x, int y, const float* positions) { 288 render(paint, text, start, len, numGlyphs, x, y, FRAMEBUFFER, NULL, 289 0, 0, NULL, positions); 290 } 291 292 void Font::render(SkPaint* paint, const char *text, uint32_t start, uint32_t len, 293 int numGlyphs, SkPath* path, float hOffset, float vOffset) { 294 if (numGlyphs == 0 || text == NULL || len == 0) { 295 return; 296 } 297 298 text += start; 299 300 int glyphsCount = 0; 301 SkFixed prevRsbDelta = 0; 302 303 float penX = 0.0f; 304 305 SkPoint position; 306 SkVector tangent; 307 308 SkPathMeasure measure(*path, false); 309 float pathLength = SkScalarToFloat(measure.getLength()); 310 311 if (paint->getTextAlign() != SkPaint::kLeft_Align) { 312 float textWidth = SkScalarToFloat(paint->measureText(text, len)); 313 float pathOffset = pathLength; 314 if (paint->getTextAlign() == SkPaint::kCenter_Align) { 315 textWidth *= 0.5f; 316 pathOffset *= 0.5f; 317 } 318 penX += pathOffset - textWidth; 319 } 320 321 while (glyphsCount < numGlyphs && penX < pathLength) { 322 glyph_t glyph = GET_GLYPH(text); 323 324 if (IS_END_OF_STRING(glyph)) { 325 break; 326 } 327 328 CachedGlyphInfo* cachedGlyph = getCachedGlyph(paint, glyph); 329 penX += SkFixedToFloat(AUTO_KERN(prevRsbDelta, cachedGlyph->mLsbDelta)); 330 prevRsbDelta = cachedGlyph->mRsbDelta; 331 332 if (cachedGlyph->mIsValid && cachedGlyph->mCacheTexture) { 333 drawCachedGlyph(cachedGlyph, penX, hOffset, vOffset, measure, &position, &tangent); 334 } 335 336 penX += SkFixedToFloat(cachedGlyph->mAdvanceX); 337 338 glyphsCount++; 339 } 340 } 341 342 void Font::measure(SkPaint* paint, const char* text, uint32_t start, uint32_t len, 343 int numGlyphs, Rect *bounds, const float* positions) { 344 if (bounds == NULL) { 345 ALOGE("No return rectangle provided to measure text"); 346 return; 347 } 348 bounds->set(1e6, -1e6, -1e6, 1e6); 349 render(paint, text, start, len, numGlyphs, 0, 0, MEASURE, NULL, 0, 0, bounds, positions); 350 } 351 352 void Font::precache(SkPaint* paint, const char* text, int numGlyphs) { 353 ATRACE_NAME("precacheText"); 354 355 if (numGlyphs == 0 || text == NULL) { 356 return; 357 } 358 359 int glyphsCount = 0; 360 while (glyphsCount < numGlyphs) { 361 glyph_t glyph = GET_GLYPH(text); 362 363 // Reached the end of the string 364 if (IS_END_OF_STRING(glyph)) { 365 break; 366 } 367 368 CachedGlyphInfo* cachedGlyph = getCachedGlyph(paint, glyph, true); 369 glyphsCount++; 370 } 371 } 372 373 void Font::render(SkPaint* paint, const char* text, uint32_t start, uint32_t len, 374 int numGlyphs, int x, int y, RenderMode mode, uint8_t *bitmap, 375 uint32_t bitmapW, uint32_t bitmapH, Rect* bounds, const float* positions) { 376 if (numGlyphs == 0 || text == NULL || len == 0) { 377 return; 378 } 379 380 static RenderGlyph gRenderGlyph[] = { 381 &android::uirenderer::Font::drawCachedGlyph, 382 &android::uirenderer::Font::drawCachedGlyphTransformed, 383 &android::uirenderer::Font::drawCachedGlyphBitmap, 384 &android::uirenderer::Font::drawCachedGlyphBitmap, 385 &android::uirenderer::Font::measureCachedGlyph, 386 &android::uirenderer::Font::measureCachedGlyph 387 }; 388 RenderGlyph render = gRenderGlyph[(mode << 1) + !mIdentityTransform]; 389 390 text += start; 391 int glyphsCount = 0; 392 393 const SkPaint::Align align = paint->getTextAlign(); 394 395 while (glyphsCount < numGlyphs) { 396 glyph_t glyph = GET_GLYPH(text); 397 398 // Reached the end of the string 399 if (IS_END_OF_STRING(glyph)) { 400 break; 401 } 402 403 CachedGlyphInfo* cachedGlyph = getCachedGlyph(paint, glyph); 404 405 // If it's still not valid, we couldn't cache it, so we shouldn't 406 // draw garbage; also skip empty glyphs (spaces) 407 if (cachedGlyph->mIsValid && cachedGlyph->mCacheTexture) { 408 float penX = x + positions[(glyphsCount << 1)]; 409 float penY = y + positions[(glyphsCount << 1) + 1]; 410 411 (*this.*render)(cachedGlyph, roundf(penX), roundf(penY), 412 bitmap, bitmapW, bitmapH, bounds, positions); 413 } 414 415 glyphsCount++; 416 } 417 } 418 419 void Font::updateGlyphCache(SkPaint* paint, const SkGlyph& skiaGlyph, SkGlyphCache* skiaGlyphCache, 420 CachedGlyphInfo* glyph, bool precaching) { 421 glyph->mAdvanceX = skiaGlyph.fAdvanceX; 422 glyph->mAdvanceY = skiaGlyph.fAdvanceY; 423 glyph->mBitmapLeft = skiaGlyph.fLeft; 424 glyph->mBitmapTop = skiaGlyph.fTop; 425 glyph->mLsbDelta = skiaGlyph.fLsbDelta; 426 glyph->mRsbDelta = skiaGlyph.fRsbDelta; 427 428 uint32_t startX = 0; 429 uint32_t startY = 0; 430 431 // Get the bitmap for the glyph 432 if (!skiaGlyph.fImage) { 433 skiaGlyphCache->findImage(skiaGlyph); 434 } 435 mState->cacheBitmap(skiaGlyph, glyph, &startX, &startY, precaching); 436 437 if (!glyph->mIsValid) { 438 return; 439 } 440 441 uint32_t endX = startX + skiaGlyph.fWidth; 442 uint32_t endY = startY + skiaGlyph.fHeight; 443 444 glyph->mStartX = startX; 445 glyph->mStartY = startY; 446 glyph->mBitmapWidth = skiaGlyph.fWidth; 447 glyph->mBitmapHeight = skiaGlyph.fHeight; 448 449 bool empty = skiaGlyph.fWidth == 0 || skiaGlyph.fHeight == 0; 450 if (!empty) { 451 uint32_t cacheWidth = glyph->mCacheTexture->getWidth(); 452 uint32_t cacheHeight = glyph->mCacheTexture->getHeight(); 453 454 glyph->mBitmapMinU = startX / (float) cacheWidth; 455 glyph->mBitmapMinV = startY / (float) cacheHeight; 456 glyph->mBitmapMaxU = endX / (float) cacheWidth; 457 glyph->mBitmapMaxV = endY / (float) cacheHeight; 458 459 mState->setTextureDirty(); 460 } 461 } 462 463 CachedGlyphInfo* Font::cacheGlyph(SkPaint* paint, glyph_t glyph, bool precaching) { 464 CachedGlyphInfo* newGlyph = new CachedGlyphInfo(); 465 mCachedGlyphs.add(glyph, newGlyph); 466 467 SkAutoGlyphCache autoCache(*paint, NULL, &mDescription.mLookupTransform); 468 const SkGlyph& skiaGlyph = GET_METRICS(autoCache.getCache(), glyph); 469 newGlyph->mIsValid = false; 470 newGlyph->mGlyphIndex = skiaGlyph.fID; 471 472 updateGlyphCache(paint, skiaGlyph, autoCache.getCache(), newGlyph, precaching); 473 474 return newGlyph; 475 } 476 477 Font* Font::create(FontRenderer* state, const SkPaint* paint, const mat4& matrix) { 478 FontDescription description(paint, matrix); 479 Font* font = state->mActiveFonts.get(description); 480 481 if (!font) { 482 font = new Font(state, description); 483 state->mActiveFonts.put(description, font); 484 } 485 font->mIdentityTransform = matrix.isIdentity(); 486 487 return font; 488 } 489 490 }; // namespace uirenderer 491 }; // namespace android 492
