FontRenderer.cpp revision 1de1083e98cde9bdd5e8539dbc54fdea6531906e
1/* 2 * Copyright (C) 2010 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 19#include <SkUtils.h> 20 21#include <cutils/properties.h> 22 23#include <utils/Log.h> 24 25#include "FontRenderer.h" 26 27namespace android { 28namespace uirenderer { 29 30/////////////////////////////////////////////////////////////////////////////// 31// Defines 32/////////////////////////////////////////////////////////////////////////////// 33 34#define DEFAULT_TEXT_CACHE_WIDTH 1024 35#define DEFAULT_TEXT_CACHE_HEIGHT 256 36 37/////////////////////////////////////////////////////////////////////////////// 38// Font 39/////////////////////////////////////////////////////////////////////////////// 40 41Font::Font(FontRenderer* state, uint32_t fontId, float fontSize) : 42 mState(state), mFontId(fontId), mFontSize(fontSize) { 43} 44 45 46Font::~Font() { 47 for (uint32_t ct = 0; ct < mState->mActiveFonts.size(); ct++) { 48 if (mState->mActiveFonts[ct] == this) { 49 mState->mActiveFonts.removeAt(ct); 50 break; 51 } 52 } 53 54 for (uint32_t i = 0; i < mCachedGlyphs.size(); i++) { 55 CachedGlyphInfo* glyph = mCachedGlyphs.valueAt(i); 56 delete glyph; 57 } 58} 59 60void Font::invalidateTextureCache() { 61 for (uint32_t i = 0; i < mCachedGlyphs.size(); i++) { 62 mCachedGlyphs.valueAt(i)->mIsValid = false; 63 } 64} 65 66void Font::measureCachedGlyph(CachedGlyphInfo *glyph, int x, int y, Rect *bounds) { 67 int nPenX = x + glyph->mBitmapLeft; 68 int nPenY = y + glyph->mBitmapTop; 69 70 int width = (int) glyph->mBitmapWidth; 71 int height = (int) glyph->mBitmapHeight; 72 73 if (bounds->bottom > nPenY) { 74 bounds->bottom = nPenY; 75 } 76 if (bounds->left > nPenX) { 77 bounds->left = nPenX; 78 } 79 if (bounds->right < nPenX + width) { 80 bounds->right = nPenX + width; 81 } 82 if (bounds->top < nPenY + height) { 83 bounds->top = nPenY + height; 84 } 85} 86 87void Font::drawCachedGlyph(CachedGlyphInfo* glyph, int x, int y) { 88 int nPenX = x + glyph->mBitmapLeft; 89 int nPenY = y + glyph->mBitmapTop + glyph->mBitmapHeight; 90 91 float u1 = glyph->mBitmapMinU; 92 float u2 = glyph->mBitmapMaxU; 93 float v1 = glyph->mBitmapMinV; 94 float v2 = glyph->mBitmapMaxV; 95 96 int width = (int) glyph->mBitmapWidth; 97 int height = (int) glyph->mBitmapHeight; 98 99 mState->appendMeshQuad(nPenX, nPenY, 0, u1, v2, 100 nPenX + width, nPenY, 0, u2, v2, 101 nPenX + width, nPenY - height, 0, u2, v1, 102 nPenX, nPenY - height, 0, u1, v1); 103} 104 105void Font::drawCachedGlyph(CachedGlyphInfo* glyph, int x, int y, 106 uint8_t* bitmap, uint32_t bitmapW, uint32_t bitmapH) { 107 int nPenX = x + glyph->mBitmapLeft; 108 int nPenY = y + glyph->mBitmapTop; 109 110 uint32_t endX = glyph->mStartX + glyph->mBitmapWidth; 111 uint32_t endY = glyph->mStartY + glyph->mBitmapHeight; 112 113 uint32_t cacheWidth = mState->getCacheWidth(); 114 const uint8_t* cacheBuffer = mState->getTextTextureData(); 115 116 uint32_t cacheX = 0, cacheY = 0; 117 int32_t bX = 0, bY = 0; 118 for (cacheX = glyph->mStartX, bX = nPenX; cacheX < endX; cacheX++, bX++) { 119 for (cacheY = glyph->mStartY, bY = nPenY; cacheY < endY; cacheY++, bY++) { 120 if (bX < 0 || bY < 0 || bX >= (int32_t) bitmapW || bY >= (int32_t) bitmapH) { 121 LOGE("Skipping invalid index"); 122 continue; 123 } 124 uint8_t tempCol = cacheBuffer[cacheY * cacheWidth + cacheX]; 125 bitmap[bY * bitmapW + bX] = tempCol; 126 } 127 } 128 129} 130 131Font::CachedGlyphInfo* Font::getCachedUTFChar(SkPaint* paint, int32_t utfChar) { 132 CachedGlyphInfo* cachedGlyph = NULL; 133 ssize_t index = mCachedGlyphs.indexOfKey(utfChar); 134 if (index >= 0) { 135 cachedGlyph = mCachedGlyphs.valueAt(index); 136 } else { 137 cachedGlyph = cacheGlyph(paint, utfChar); 138 } 139 140 // Is the glyph still in texture cache? 141 if (!cachedGlyph->mIsValid) { 142 const SkGlyph& skiaGlyph = paint->getUnicharMetrics(utfChar); 143 updateGlyphCache(paint, skiaGlyph, cachedGlyph); 144 } 145 146 return cachedGlyph; 147} 148 149void Font::renderUTF(SkPaint* paint, const char* text, uint32_t start, uint32_t len, 150 int numGlyphs, int x, int y, uint8_t *bitmap, uint32_t bitmapW, uint32_t bitmapH) { 151 if (bitmap != NULL && bitmapW > 0 && bitmapH > 0) { 152 renderUTF(paint, text, start, len, numGlyphs, x, y, BITMAP, bitmap, 153 bitmapW, bitmapH, NULL); 154 } else { 155 renderUTF(paint, text, start, len, numGlyphs, x, y, FRAMEBUFFER, NULL, 0, 0, NULL); 156 } 157 158} 159 160void Font::measureUTF(SkPaint* paint, const char* text, uint32_t start, uint32_t len, 161 int numGlyphs, Rect *bounds) { 162 if (bounds == NULL) { 163 LOGE("No return rectangle provided to measure text"); 164 return; 165 } 166 bounds->set(1e6, -1e6, -1e6, 1e6); 167 renderUTF(paint, text, start, len, numGlyphs, 0, 0, MEASURE, NULL, 0, 0, bounds); 168} 169 170#define SkAutoKern_AdjustF(prev, next) (((next) - (prev) + 32) >> 6 << 16) 171 172void Font::renderUTF(SkPaint* paint, const char* text, uint32_t start, uint32_t len, 173 int numGlyphs, int x, int y, RenderMode mode, uint8_t *bitmap, 174 uint32_t bitmapW, uint32_t bitmapH,Rect *bounds) { 175 if (numGlyphs == 0 || text == NULL || len == 0) { 176 return; 177 } 178 179 SkFixed penX = SkIntToFixed(x); 180 int penY = y; 181 int glyphsLeft = 1; 182 if (numGlyphs > 0) { 183 glyphsLeft = numGlyphs; 184 } 185 186 SkFixed prevRsbDelta = 0; 187 penX += SK_Fixed1 / 2; 188 189 text += start; 190 191 while (glyphsLeft > 0) { 192 int32_t utfChar = SkUTF16_NextUnichar((const uint16_t**) &text); 193 194 // Reached the end of the string 195 if (utfChar < 0) { 196 break; 197 } 198 199 CachedGlyphInfo* cachedGlyph = getCachedUTFChar(paint, utfChar); 200 penX += SkAutoKern_AdjustF(prevRsbDelta, cachedGlyph->mLsbDelta); 201 prevRsbDelta = cachedGlyph->mRsbDelta; 202 203 // If it's still not valid, we couldn't cache it, so we shouldn't draw garbage 204 if (cachedGlyph->mIsValid) { 205 switch(mode) { 206 case FRAMEBUFFER: 207 drawCachedGlyph(cachedGlyph, SkFixedFloor(penX), penY); 208 break; 209 case BITMAP: 210 drawCachedGlyph(cachedGlyph, SkFixedFloor(penX), penY, bitmap, bitmapW, bitmapH); 211 break; 212 case MEASURE: 213 measureCachedGlyph(cachedGlyph, SkFixedFloor(penX), penY, bounds); 214 break; 215 } 216 } 217 218 penX += cachedGlyph->mAdvanceX; 219 220 // If we were given a specific number of glyphs, decrement 221 if (numGlyphs > 0) { 222 glyphsLeft--; 223 } 224 } 225} 226 227void Font::updateGlyphCache(SkPaint* paint, const SkGlyph& skiaGlyph, CachedGlyphInfo* glyph) { 228 glyph->mAdvanceX = skiaGlyph.fAdvanceX; 229 glyph->mAdvanceY = skiaGlyph.fAdvanceY; 230 glyph->mBitmapLeft = skiaGlyph.fLeft; 231 glyph->mBitmapTop = skiaGlyph.fTop; 232 glyph->mLsbDelta = skiaGlyph.fLsbDelta; 233 glyph->mRsbDelta = skiaGlyph.fRsbDelta; 234 235 uint32_t startX = 0; 236 uint32_t startY = 0; 237 238 // Get the bitmap for the glyph 239 paint->findImage(skiaGlyph); 240 glyph->mIsValid = mState->cacheBitmap(skiaGlyph, &startX, &startY); 241 242 if (!glyph->mIsValid) { 243 return; 244 } 245 246 uint32_t endX = startX + skiaGlyph.fWidth; 247 uint32_t endY = startY + skiaGlyph.fHeight; 248 249 glyph->mStartX = startX; 250 glyph->mStartY = startY; 251 glyph->mBitmapWidth = skiaGlyph.fWidth; 252 glyph->mBitmapHeight = skiaGlyph.fHeight; 253 254 uint32_t cacheWidth = mState->getCacheWidth(); 255 uint32_t cacheHeight = mState->getCacheHeight(); 256 257 glyph->mBitmapMinU = (float) startX / (float) cacheWidth; 258 glyph->mBitmapMinV = (float) startY / (float) cacheHeight; 259 glyph->mBitmapMaxU = (float) endX / (float) cacheWidth; 260 glyph->mBitmapMaxV = (float) endY / (float) cacheHeight; 261 262 mState->mUploadTexture = true; 263} 264 265Font::CachedGlyphInfo* Font::cacheGlyph(SkPaint* paint, int32_t glyph) { 266 CachedGlyphInfo* newGlyph = new CachedGlyphInfo(); 267 mCachedGlyphs.add(glyph, newGlyph); 268 269 const SkGlyph& skiaGlyph = paint->getUnicharMetrics(glyph); 270 newGlyph->mGlyphIndex = skiaGlyph.fID; 271 newGlyph->mIsValid = false; 272 273 updateGlyphCache(paint, skiaGlyph, newGlyph); 274 275 return newGlyph; 276} 277 278Font* Font::create(FontRenderer* state, uint32_t fontId, float fontSize) { 279 Vector<Font*> &activeFonts = state->mActiveFonts; 280 281 for (uint32_t i = 0; i < activeFonts.size(); i++) { 282 Font* font = activeFonts[i]; 283 if (font->mFontId == fontId && font->mFontSize == fontSize) { 284 return font; 285 } 286 } 287 288 Font* newFont = new Font(state, fontId, fontSize); 289 activeFonts.push(newFont); 290 return newFont; 291} 292 293/////////////////////////////////////////////////////////////////////////////// 294// FontRenderer 295/////////////////////////////////////////////////////////////////////////////// 296 297FontRenderer::FontRenderer() { 298 LOGD("Creating FontRenderer"); 299 300 mGammaTable = NULL; 301 mInitialized = false; 302 mMaxNumberOfQuads = 1024; 303 mCurrentQuadIndex = 0; 304 mTextureId = 0; 305 306 mTextMeshPtr = NULL; 307 mTextTexture = NULL; 308 309 mIndexBufferID = 0; 310 311 mCacheWidth = DEFAULT_TEXT_CACHE_WIDTH; 312 mCacheHeight = DEFAULT_TEXT_CACHE_HEIGHT; 313 314 char property[PROPERTY_VALUE_MAX]; 315 if (property_get(PROPERTY_TEXT_CACHE_WIDTH, property, NULL) > 0) { 316 LOGD(" Setting text cache width to %s pixels", property); 317 mCacheWidth = atoi(property); 318 } else { 319 LOGD(" Using default text cache width of %i pixels", mCacheWidth); 320 } 321 322 if (property_get(PROPERTY_TEXT_CACHE_HEIGHT, property, NULL) > 0) { 323 LOGD(" Setting text cache width to %s pixels", property); 324 mCacheHeight = atoi(property); 325 } else { 326 LOGD(" Using default text cache height of %i pixels", mCacheHeight); 327 } 328} 329 330FontRenderer::~FontRenderer() { 331 for (uint32_t i = 0; i < mCacheLines.size(); i++) { 332 delete mCacheLines[i]; 333 } 334 mCacheLines.clear(); 335 336 if (mInitialized) { 337 delete[] mTextMeshPtr; 338 delete[] mTextTexture; 339 } 340 341 if (mTextureId) { 342 glDeleteTextures(1, &mTextureId); 343 } 344 345 Vector<Font*> fontsToDereference = mActiveFonts; 346 for (uint32_t i = 0; i < fontsToDereference.size(); i++) { 347 delete fontsToDereference[i]; 348 } 349} 350 351void FontRenderer::flushAllAndInvalidate() { 352 if (mCurrentQuadIndex != 0) { 353 issueDrawCommand(); 354 mCurrentQuadIndex = 0; 355 } 356 for (uint32_t i = 0; i < mActiveFonts.size(); i++) { 357 mActiveFonts[i]->invalidateTextureCache(); 358 } 359 for (uint32_t i = 0; i < mCacheLines.size(); i++) { 360 mCacheLines[i]->mCurrentCol = 0; 361 } 362} 363 364bool FontRenderer::cacheBitmap(const SkGlyph& glyph, uint32_t* retOriginX, uint32_t* retOriginY) { 365 // If the glyph is too tall, don't cache it 366 if (glyph.fHeight > mCacheLines[mCacheLines.size() - 1]->mMaxHeight) { 367 LOGE("Font size to large to fit in cache. width, height = %i, %i", 368 (int) glyph.fWidth, (int) glyph.fHeight); 369 return false; 370 } 371 372 // Now copy the bitmap into the cache texture 373 uint32_t startX = 0; 374 uint32_t startY = 0; 375 376 bool bitmapFit = false; 377 for (uint32_t i = 0; i < mCacheLines.size(); i++) { 378 bitmapFit = mCacheLines[i]->fitBitmap(glyph, &startX, &startY); 379 if (bitmapFit) { 380 break; 381 } 382 } 383 384 // If the new glyph didn't fit, flush the state so far and invalidate everything 385 if (!bitmapFit) { 386 flushAllAndInvalidate(); 387 388 // Try to fit it again 389 for (uint32_t i = 0; i < mCacheLines.size(); i++) { 390 bitmapFit = mCacheLines[i]->fitBitmap(glyph, &startX, &startY); 391 if (bitmapFit) { 392 break; 393 } 394 } 395 396 // if we still don't fit, something is wrong and we shouldn't draw 397 if (!bitmapFit) { 398 LOGE("Bitmap doesn't fit in cache. width, height = %i, %i", 399 (int) glyph.fWidth, (int) glyph.fHeight); 400 return false; 401 } 402 } 403 404 *retOriginX = startX; 405 *retOriginY = startY; 406 407 uint32_t endX = startX + glyph.fWidth; 408 uint32_t endY = startY + glyph.fHeight; 409 410 uint32_t cacheWidth = mCacheWidth; 411 412 uint8_t* cacheBuffer = mTextTexture; 413 uint8_t* bitmapBuffer = (uint8_t*) glyph.fImage; 414 unsigned int stride = glyph.rowBytes(); 415 416 uint32_t cacheX = 0, bX = 0, cacheY = 0, bY = 0; 417 for (cacheX = startX, bX = 0; cacheX < endX; cacheX++, bX++) { 418 for (cacheY = startY, bY = 0; cacheY < endY; cacheY++, bY++) { 419 uint8_t tempCol = bitmapBuffer[bY * stride + bX]; 420 cacheBuffer[cacheY * cacheWidth + cacheX] = mGammaTable[tempCol]; 421 } 422 } 423 424 return true; 425} 426 427void FontRenderer::initTextTexture() { 428 mTextTexture = new uint8_t[mCacheWidth * mCacheHeight]; 429 memset(mTextTexture, 0, mCacheWidth * mCacheHeight * sizeof(uint8_t)); 430 431 mUploadTexture = false; 432 433 glGenTextures(1, &mTextureId); 434 glBindTexture(GL_TEXTURE_2D, mTextureId); 435 glPixelStorei(GL_UNPACK_ALIGNMENT, 1); 436 // Initialize texture dimentions 437 glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, mCacheWidth, mCacheHeight, 0, 438 GL_ALPHA, GL_UNSIGNED_BYTE, 0); 439 440 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); 441 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); 442 443 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 444 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 445 446 // Split up our cache texture into lines of certain widths 447 int nextLine = 0; 448 mCacheLines.push(new CacheTextureLine(mCacheWidth, 18, nextLine, 0)); 449 nextLine += mCacheLines.top()->mMaxHeight; 450 mCacheLines.push(new CacheTextureLine(mCacheWidth, 26, nextLine, 0)); 451 nextLine += mCacheLines.top()->mMaxHeight; 452 mCacheLines.push(new CacheTextureLine(mCacheWidth, 26, nextLine, 0)); 453 nextLine += mCacheLines.top()->mMaxHeight; 454 mCacheLines.push(new CacheTextureLine(mCacheWidth, 34, nextLine, 0)); 455 nextLine += mCacheLines.top()->mMaxHeight; 456 mCacheLines.push(new CacheTextureLine(mCacheWidth, 34, nextLine, 0)); 457 nextLine += mCacheLines.top()->mMaxHeight; 458 mCacheLines.push(new CacheTextureLine(mCacheWidth, 42, nextLine, 0)); 459 nextLine += mCacheLines.top()->mMaxHeight; 460 mCacheLines.push(new CacheTextureLine(mCacheWidth, mCacheHeight - nextLine, nextLine, 0)); 461} 462 463// Avoid having to reallocate memory and render quad by quad 464void FontRenderer::initVertexArrayBuffers() { 465 uint32_t numIndicies = mMaxNumberOfQuads * 6; 466 uint32_t indexBufferSizeBytes = numIndicies * sizeof(uint16_t); 467 uint16_t* indexBufferData = (uint16_t*) malloc(indexBufferSizeBytes); 468 469 // Four verts, two triangles , six indices per quad 470 for (uint32_t i = 0; i < mMaxNumberOfQuads; i++) { 471 int i6 = i * 6; 472 int i4 = i * 4; 473 474 indexBufferData[i6 + 0] = i4 + 0; 475 indexBufferData[i6 + 1] = i4 + 1; 476 indexBufferData[i6 + 2] = i4 + 2; 477 478 indexBufferData[i6 + 3] = i4 + 0; 479 indexBufferData[i6 + 4] = i4 + 2; 480 indexBufferData[i6 + 5] = i4 + 3; 481 } 482 483 glGenBuffers(1, &mIndexBufferID); 484 glBindBuffer(GL_ARRAY_BUFFER, mIndexBufferID); 485 glBufferData(GL_ARRAY_BUFFER, indexBufferSizeBytes, indexBufferData, GL_DYNAMIC_DRAW); 486 glBindBuffer(GL_ARRAY_BUFFER, 0); 487 488 free(indexBufferData); 489 490 uint32_t coordSize = 3; 491 uint32_t uvSize = 2; 492 uint32_t vertsPerQuad = 4; 493 uint32_t vertexBufferSize = mMaxNumberOfQuads * vertsPerQuad * coordSize * uvSize; 494 mTextMeshPtr = new float[vertexBufferSize]; 495} 496 497// We don't want to allocate anything unless we actually draw text 498void FontRenderer::checkInit() { 499 if (mInitialized) { 500 return; 501 } 502 503 initTextTexture(); 504 initVertexArrayBuffers(); 505 506 // We store a string with letters in a rough frequency of occurrence 507 mLatinPrecache = String16("eisarntolcdugpmhbyfvkwzxjq "); 508 mLatinPrecache += String16("EISARNTOLCDUGPMHBYFVKWZXJQ"); 509 mLatinPrecache += String16(",.?!()-+@;:`'"); 510 mLatinPrecache += String16("0123456789"); 511 512 mInitialized = true; 513} 514 515void FontRenderer::checkTextureUpdate() { 516 if (!mUploadTexture) { 517 return; 518 } 519 520 glBindTexture(GL_TEXTURE_2D, mTextureId); 521 522 // Iterate over all the cache lines and see which ones need to be updated 523 for (uint32_t i = 0; i < mCacheLines.size(); i++) { 524 CacheTextureLine* cl = mCacheLines[i]; 525 if(cl->mDirty) { 526 uint32_t xOffset = 0; 527 uint32_t yOffset = cl->mCurrentRow; 528 uint32_t width = mCacheWidth; 529 uint32_t height = cl->mMaxHeight; 530 void* textureData = mTextTexture + yOffset*width; 531 532 glTexSubImage2D(GL_TEXTURE_2D, 0, xOffset, yOffset, width, height, 533 GL_ALPHA, GL_UNSIGNED_BYTE, textureData); 534 535 cl->mDirty = false; 536 } 537 } 538 539 mUploadTexture = false; 540} 541 542void FontRenderer::issueDrawCommand() { 543 checkTextureUpdate(); 544 545 float* vtx = mTextMeshPtr; 546 float* tex = vtx + 3; 547 548 // position is slot 0 549 uint32_t slot = 0; 550 glVertexAttribPointer(slot, 3, GL_FLOAT, false, 20, vtx); 551 552 // texture0 is slot 1 553 slot = 1; 554 glVertexAttribPointer(slot, 2, GL_FLOAT, false, 20, tex); 555 556 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mIndexBufferID); 557 glDrawElements(GL_TRIANGLES, mCurrentQuadIndex * 6, GL_UNSIGNED_SHORT, NULL); 558} 559 560void FontRenderer::appendMeshQuad(float x1, float y1, float z1, float u1, float v1, float x2, 561 float y2, float z2, float u2, float v2, float x3, float y3, float z3, float u3, float v3, 562 float x4, float y4, float z4, float u4, float v4) { 563 if (x1 > mClip->right || y1 < mClip->top || x2 < mClip->left || y4 > mClip->bottom) { 564 return; 565 } 566 567 const uint32_t vertsPerQuad = 4; 568 const uint32_t floatsPerVert = 5; 569 float* currentPos = mTextMeshPtr + mCurrentQuadIndex * vertsPerQuad * floatsPerVert; 570 571 (*currentPos++) = x1; 572 (*currentPos++) = y1; 573 (*currentPos++) = z1; 574 (*currentPos++) = u1; 575 (*currentPos++) = v1; 576 577 (*currentPos++) = x2; 578 (*currentPos++) = y2; 579 (*currentPos++) = z2; 580 (*currentPos++) = u2; 581 (*currentPos++) = v2; 582 583 (*currentPos++) = x3; 584 (*currentPos++) = y3; 585 (*currentPos++) = z3; 586 (*currentPos++) = u3; 587 (*currentPos++) = v3; 588 589 (*currentPos++) = x4; 590 (*currentPos++) = y4; 591 (*currentPos++) = z4; 592 (*currentPos++) = u4; 593 (*currentPos++) = v4; 594 595 mCurrentQuadIndex++; 596 597 if (mCurrentQuadIndex == mMaxNumberOfQuads) { 598 issueDrawCommand(); 599 mCurrentQuadIndex = 0; 600 } 601} 602 603uint32_t FontRenderer::getRemainingCacheCapacity() { 604 uint32_t remainingCapacity = 0; 605 float totalPixels = 0; 606 for(uint32_t i = 0; i < mCacheLines.size(); i ++) { 607 remainingCapacity += (mCacheLines[i]->mMaxWidth - mCacheLines[i]->mCurrentCol); 608 totalPixels += mCacheLines[i]->mMaxWidth; 609 } 610 remainingCapacity = (remainingCapacity * 100) / totalPixels; 611 return remainingCapacity; 612} 613 614void FontRenderer::precacheLatin(SkPaint* paint) { 615 // Remaining capacity is measured in % 616 uint32_t remainingCapacity = getRemainingCacheCapacity(); 617 uint32_t precacheIdx = 0; 618 while(remainingCapacity > 25 && precacheIdx < mLatinPrecache.size()) { 619 mCurrentFont->getCachedUTFChar(paint, (int32_t)mLatinPrecache[precacheIdx]); 620 remainingCapacity = getRemainingCacheCapacity(); 621 precacheIdx ++; 622 } 623} 624 625void FontRenderer::setFont(SkPaint* paint, uint32_t fontId, float fontSize) { 626 uint32_t currentNumFonts = mActiveFonts.size(); 627 mCurrentFont = Font::create(this, fontId, fontSize); 628 629 const float maxPrecacheFontSize = 40.0f; 630 bool isNewFont = currentNumFonts != mActiveFonts.size(); 631 632 if (isNewFont && fontSize <= maxPrecacheFontSize) { 633 precacheLatin(paint); 634 } 635} 636 637FontRenderer::DropShadow FontRenderer::renderDropShadow(SkPaint* paint, const char *text, 638 uint32_t startIndex, uint32_t len, int numGlyphs, uint32_t radius) { 639 checkInit(); 640 641 if (!mCurrentFont) { 642 DropShadow image; 643 image.width = 0; 644 image.height = 0; 645 image.image = NULL; 646 image.penX = 0; 647 image.penY = 0; 648 return image; 649 } 650 651 Rect bounds; 652 mCurrentFont->measureUTF(paint, text, startIndex, len, numGlyphs, &bounds); 653 uint32_t paddedWidth = (uint32_t) (bounds.right - bounds.left) + 2 * radius; 654 uint32_t paddedHeight = (uint32_t) (bounds.top - bounds.bottom) + 2 * radius; 655 uint8_t* dataBuffer = new uint8_t[paddedWidth * paddedHeight]; 656 for (uint32_t i = 0; i < paddedWidth * paddedHeight; i++) { 657 dataBuffer[i] = 0; 658 } 659 660 int penX = radius - bounds.left; 661 int penY = radius - bounds.bottom; 662 663 mCurrentFont->renderUTF(paint, text, startIndex, len, numGlyphs, penX, penY, 664 dataBuffer, paddedWidth, paddedHeight); 665 blurImage(dataBuffer, paddedWidth, paddedHeight, radius); 666 667 DropShadow image; 668 image.width = paddedWidth; 669 image.height = paddedHeight; 670 image.image = dataBuffer; 671 image.penX = penX; 672 image.penY = penY; 673 return image; 674} 675 676void FontRenderer::renderText(SkPaint* paint, const Rect* clip, const char *text, 677 uint32_t startIndex, uint32_t len, int numGlyphs, int x, int y) { 678 checkInit(); 679 680 if (!mCurrentFont) { 681 LOGE("No font set"); 682 return; 683 } 684 685 mClip = clip; 686 mCurrentFont->renderUTF(paint, text, startIndex, len, numGlyphs, x, y); 687 688 if (mCurrentQuadIndex != 0) { 689 issueDrawCommand(); 690 mCurrentQuadIndex = 0; 691 } 692} 693 694void FontRenderer::computeGaussianWeights(float* weights, int32_t radius) { 695 // Compute gaussian weights for the blur 696 // e is the euler's number 697 float e = 2.718281828459045f; 698 float pi = 3.1415926535897932f; 699 // g(x) = ( 1 / sqrt( 2 * pi ) * sigma) * e ^ ( -x^2 / 2 * sigma^2 ) 700 // x is of the form [-radius .. 0 .. radius] 701 // and sigma varies with radius. 702 // Based on some experimental radius values and sigma's 703 // we approximately fit sigma = f(radius) as 704 // sigma = radius * 0.3 + 0.6 705 // The larger the radius gets, the more our gaussian blur 706 // will resemble a box blur since with large sigma 707 // the gaussian curve begins to lose its shape 708 float sigma = 0.3f * (float)radius + 0.6f; 709 710 // Now compute the coefficints 711 // We will store some redundant values to save some math during 712 // the blur calculations 713 // precompute some values 714 float coeff1 = 1.0f / (sqrt( 2.0f * pi ) * sigma); 715 float coeff2 = - 1.0f / (2.0f * sigma * sigma); 716 717 float normalizeFactor = 0.0f; 718 for(int32_t r = -radius; r <= radius; r ++) { 719 float floatR = (float) r; 720 weights[r + radius] = coeff1 * pow(e, floatR * floatR * coeff2); 721 normalizeFactor += weights[r + radius]; 722 } 723 724 //Now we need to normalize the weights because all our coefficients need to add up to one 725 normalizeFactor = 1.0f / normalizeFactor; 726 for(int32_t r = -radius; r <= radius; r ++) { 727 weights[r + radius] *= normalizeFactor; 728 } 729} 730 731void FontRenderer::horizontalBlur(float* weights, int32_t radius, 732 const uint8_t* source, uint8_t* dest, int32_t width, int32_t height) { 733 float blurredPixel = 0.0f; 734 float currentPixel = 0.0f; 735 736 for(int32_t y = 0; y < height; y ++) { 737 738 const uint8_t* input = source + y * width; 739 uint8_t* output = dest + y * width; 740 741 for(int32_t x = 0; x < width; x ++) { 742 blurredPixel = 0.0f; 743 const float* gPtr = weights; 744 // Optimization for non-border pixels 745 if ((x > radius) && (x < (width - radius))) { 746 const uint8_t *i = input + (x - radius); 747 for(int r = -radius; r <= radius; r ++) { 748 currentPixel = (float) (*i); 749 blurredPixel += currentPixel * gPtr[0]; 750 gPtr++; 751 i++; 752 } 753 } else { 754 for(int32_t r = -radius; r <= radius; r ++) { 755 // Stepping left and right away from the pixel 756 int validW = x + r; 757 if(validW < 0) { 758 validW = 0; 759 } 760 if(validW > width - 1) { 761 validW = width - 1; 762 } 763 764 currentPixel = (float)(input[validW]); 765 blurredPixel += currentPixel * gPtr[0]; 766 gPtr++; 767 } 768 } 769 *output = (uint8_t)blurredPixel; 770 output ++; 771 } 772 } 773} 774 775void FontRenderer::verticalBlur(float* weights, int32_t radius, 776 const uint8_t* source, uint8_t* dest, int32_t width, int32_t height) { 777 float blurredPixel = 0.0f; 778 float currentPixel = 0.0f; 779 780 for(int32_t y = 0; y < height; y ++) { 781 782 uint8_t* output = dest + y * width; 783 784 for(int32_t x = 0; x < width; x ++) { 785 blurredPixel = 0.0f; 786 const float* gPtr = weights; 787 const uint8_t* input = source + x; 788 // Optimization for non-border pixels 789 if ((y > radius) && (y < (height - radius))) { 790 const uint8_t *i = input + ((y - radius) * width); 791 for(int32_t r = -radius; r <= radius; r ++) { 792 currentPixel = (float)(*i); 793 blurredPixel += currentPixel * gPtr[0]; 794 gPtr++; 795 i += width; 796 } 797 } else { 798 for(int32_t r = -radius; r <= radius; r ++) { 799 int validH = y + r; 800 // Clamp to zero and width 801 if(validH < 0) { 802 validH = 0; 803 } 804 if(validH > height - 1) { 805 validH = height - 1; 806 } 807 808 const uint8_t *i = input + validH * width; 809 currentPixel = (float)(*i); 810 blurredPixel += currentPixel * gPtr[0]; 811 gPtr++; 812 } 813 } 814 *output = (uint8_t)blurredPixel; 815 output ++; 816 } 817 } 818} 819 820 821void FontRenderer::blurImage(uint8_t *image, int32_t width, int32_t height, int32_t radius) { 822 float *gaussian = new float[2 * radius + 1]; 823 computeGaussianWeights(gaussian, radius); 824 uint8_t* scratch = new uint8_t[width * height]; 825 horizontalBlur(gaussian, radius, image, scratch, width, height); 826 verticalBlur(gaussian, radius, scratch, image, width, height); 827 delete[] gaussian; 828 delete[] scratch; 829} 830 831}; // namespace uirenderer 832}; // namespace android 833