OpenGLRenderer.cpp revision a674ab74e359ac73b4c4dd6b1a3a771836ac7e40
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 <stdlib.h> 20#include <stdint.h> 21#include <sys/types.h> 22 23#include <SkCanvas.h> 24#include <SkTypeface.h> 25 26#include <cutils/properties.h> 27#include <utils/Log.h> 28 29#include "OpenGLRenderer.h" 30#include "Properties.h" 31 32namespace android { 33namespace uirenderer { 34 35/////////////////////////////////////////////////////////////////////////////// 36// Defines 37/////////////////////////////////////////////////////////////////////////////// 38 39#define DEFAULT_TEXTURE_CACHE_SIZE 20.0f 40#define DEFAULT_LAYER_CACHE_SIZE 6.0f 41#define DEFAULT_PATH_CACHE_SIZE 6.0f 42#define DEFAULT_PATCH_CACHE_SIZE 100 43#define DEFAULT_GRADIENT_CACHE_SIZE 0.5f 44 45#define REQUIRED_TEXTURE_UNITS_COUNT 3 46 47// Converts a number of mega-bytes into bytes 48#define MB(s) s * 1024 * 1024 49 50// Generates simple and textured vertices 51#define FV(x, y, u, v) { { x, y }, { u, v } } 52 53/////////////////////////////////////////////////////////////////////////////// 54// Globals 55/////////////////////////////////////////////////////////////////////////////// 56 57// This array is never used directly but used as a memcpy source in the 58// OpenGLRenderer constructor 59static const TextureVertex gMeshVertices[] = { 60 FV(0.0f, 0.0f, 0.0f, 0.0f), 61 FV(1.0f, 0.0f, 1.0f, 0.0f), 62 FV(0.0f, 1.0f, 0.0f, 1.0f), 63 FV(1.0f, 1.0f, 1.0f, 1.0f) 64}; 65static const GLsizei gMeshStride = sizeof(TextureVertex); 66static const GLsizei gMeshCount = 4; 67 68/** 69 * Structure mapping Skia xfermodes to OpenGL blending factors. 70 */ 71struct Blender { 72 SkXfermode::Mode mode; 73 GLenum src; 74 GLenum dst; 75}; // struct Blender 76 77// In this array, the index of each Blender equals the value of the first 78// entry. For instance, gBlends[1] == gBlends[SkXfermode::kSrc_Mode] 79static const Blender gBlends[] = { 80 { SkXfermode::kClear_Mode, GL_ZERO, GL_ZERO }, 81 { SkXfermode::kSrc_Mode, GL_ONE, GL_ZERO }, 82 { SkXfermode::kDst_Mode, GL_ZERO, GL_ONE }, 83 { SkXfermode::kSrcOver_Mode, GL_ONE, GL_ONE_MINUS_SRC_ALPHA }, 84 { SkXfermode::kDstOver_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ONE }, 85 { SkXfermode::kSrcIn_Mode, GL_DST_ALPHA, GL_ZERO }, 86 { SkXfermode::kDstIn_Mode, GL_ZERO, GL_SRC_ALPHA }, 87 { SkXfermode::kSrcOut_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ZERO }, 88 { SkXfermode::kDstOut_Mode, GL_ZERO, GL_ONE_MINUS_SRC_ALPHA }, 89 { SkXfermode::kSrcATop_Mode, GL_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA }, 90 { SkXfermode::kDstATop_Mode, GL_ONE_MINUS_DST_ALPHA, GL_SRC_ALPHA }, 91 { SkXfermode::kXor_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA } 92}; 93 94static const GLenum gTextureUnits[] = { 95 GL_TEXTURE0, 96 GL_TEXTURE1, 97 GL_TEXTURE2 98}; 99 100/////////////////////////////////////////////////////////////////////////////// 101// Constructors/destructor 102/////////////////////////////////////////////////////////////////////////////// 103 104OpenGLRenderer::OpenGLRenderer(): 105 mBlend(false), mLastSrcMode(GL_ZERO), mLastDstMode(GL_ZERO), 106 mTextureCache(MB(DEFAULT_TEXTURE_CACHE_SIZE)), 107 mLayerCache(MB(DEFAULT_LAYER_CACHE_SIZE)), 108 mGradientCache(MB(DEFAULT_GRADIENT_CACHE_SIZE)), 109 mPathCache(MB(DEFAULT_PATH_CACHE_SIZE)), 110 mPatchCache(DEFAULT_PATCH_CACHE_SIZE) { 111 LOGD("Create OpenGLRenderer"); 112 113 char property[PROPERTY_VALUE_MAX]; 114 if (property_get(PROPERTY_TEXTURE_CACHE_SIZE, property, NULL) > 0) { 115 LOGD(" Setting texture cache size to %sMB", property); 116 mTextureCache.setMaxSize(MB(atof(property))); 117 } else { 118 LOGD(" Using default texture cache size of %.2fMB", DEFAULT_TEXTURE_CACHE_SIZE); 119 } 120 121 if (property_get(PROPERTY_LAYER_CACHE_SIZE, property, NULL) > 0) { 122 LOGD(" Setting layer cache size to %sMB", property); 123 mLayerCache.setMaxSize(MB(atof(property))); 124 } else { 125 LOGD(" Using default layer cache size of %.2fMB", DEFAULT_LAYER_CACHE_SIZE); 126 } 127 128 if (property_get(PROPERTY_GRADIENT_CACHE_SIZE, property, NULL) > 0) { 129 LOGD(" Setting gradient cache size to %sMB", property); 130 mGradientCache.setMaxSize(MB(atof(property))); 131 } else { 132 LOGD(" Using default gradient cache size of %.2fMB", DEFAULT_GRADIENT_CACHE_SIZE); 133 } 134 135 if (property_get(PROPERTY_PATH_CACHE_SIZE, property, NULL) > 0) { 136 LOGD(" Setting path cache size to %sMB", property); 137 mPathCache.setMaxSize(MB(atof(property))); 138 } else { 139 LOGD(" Using default path cache size of %.2fMB", DEFAULT_PATH_CACHE_SIZE); 140 } 141 142 mCurrentProgram = NULL; 143 mShader = NULL; 144 mColorFilter = NULL; 145 146 memcpy(mMeshVertices, gMeshVertices, sizeof(gMeshVertices)); 147 148 mFirstSnapshot = new Snapshot; 149 150 GLint maxTextureUnits; 151 glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &maxTextureUnits); 152 if (maxTextureUnits < REQUIRED_TEXTURE_UNITS_COUNT) { 153 LOGW("At least %d texture units are required!", REQUIRED_TEXTURE_UNITS_COUNT); 154 } 155} 156 157OpenGLRenderer::~OpenGLRenderer() { 158 LOGD("Destroy OpenGLRenderer"); 159 160 mTextureCache.clear(); 161 mLayerCache.clear(); 162 mGradientCache.clear(); 163 mPatchCache.clear(); 164} 165 166/////////////////////////////////////////////////////////////////////////////// 167// Setup 168/////////////////////////////////////////////////////////////////////////////// 169 170void OpenGLRenderer::setViewport(int width, int height) { 171 glViewport(0, 0, width, height); 172 173 mOrthoMatrix.loadOrtho(0, width, height, 0, -1, 1); 174 175 mWidth = width; 176 mHeight = height; 177 mFirstSnapshot->height = height; 178} 179 180void OpenGLRenderer::prepare() { 181 mSnapshot = new Snapshot(mFirstSnapshot); 182 mSaveCount = 0; 183 184 glDisable(GL_SCISSOR_TEST); 185 186 glClearColor(0.0f, 0.0f, 0.0f, 0.0f); 187 glClear(GL_COLOR_BUFFER_BIT); 188 189 glEnable(GL_SCISSOR_TEST); 190 glScissor(0, 0, mWidth, mHeight); 191 192 mSnapshot->setClip(0.0f, 0.0f, mWidth, mHeight); 193} 194 195/////////////////////////////////////////////////////////////////////////////// 196// State management 197/////////////////////////////////////////////////////////////////////////////// 198 199int OpenGLRenderer::getSaveCount() const { 200 return mSaveCount; 201} 202 203int OpenGLRenderer::save(int flags) { 204 return saveSnapshot(); 205} 206 207void OpenGLRenderer::restore() { 208 if (mSaveCount == 0) return; 209 210 if (restoreSnapshot()) { 211 setScissorFromClip(); 212 } 213} 214 215void OpenGLRenderer::restoreToCount(int saveCount) { 216 if (saveCount <= 0 || saveCount > mSaveCount) return; 217 218 bool restoreClip = false; 219 220 while (mSaveCount != saveCount - 1) { 221 restoreClip |= restoreSnapshot(); 222 } 223 224 if (restoreClip) { 225 setScissorFromClip(); 226 } 227} 228 229int OpenGLRenderer::saveSnapshot() { 230 mSnapshot = new Snapshot(mSnapshot); 231 return ++mSaveCount; 232} 233 234bool OpenGLRenderer::restoreSnapshot() { 235 bool restoreClip = mSnapshot->flags & Snapshot::kFlagClipSet; 236 bool restoreLayer = mSnapshot->flags & Snapshot::kFlagIsLayer; 237 bool restoreOrtho = mSnapshot->flags & Snapshot::kFlagDirtyOrtho; 238 239 sp<Snapshot> current = mSnapshot; 240 sp<Snapshot> previous = mSnapshot->previous; 241 242 if (restoreOrtho) { 243 mOrthoMatrix.load(current->orthoMatrix); 244 } 245 246 if (restoreLayer) { 247 composeLayer(current, previous); 248 } 249 250 mSnapshot = previous; 251 mSaveCount--; 252 253 return restoreClip; 254} 255 256void OpenGLRenderer::composeLayer(sp<Snapshot> current, sp<Snapshot> previous) { 257 if (!current->layer) { 258 LOGE("Attempting to compose a layer that does not exist"); 259 return; 260 } 261 262 // Unbind current FBO and restore previous one 263 // Most of the time, previous->fbo will be 0 to bind the default buffer 264 glBindFramebuffer(GL_FRAMEBUFFER, previous->fbo); 265 266 // Restore the clip from the previous snapshot 267 const Rect& clip = previous->clipRect; 268 glScissor(clip.left, mHeight - clip.bottom, clip.getWidth(), clip.getHeight()); 269 270 Layer* layer = current->layer; 271 const Rect& rect = layer->layer; 272 273 drawTextureRect(rect.left, rect.top, rect.right, rect.bottom, 274 layer->texture, layer->alpha, layer->mode, layer->blend); 275 276 LayerSize size(rect.getWidth(), rect.getHeight()); 277 // Failing to add the layer to the cache should happen only if the 278 // layer is too large 279 if (!mLayerCache.put(size, layer)) { 280 LAYER_LOGD("Deleting layer"); 281 282 glDeleteFramebuffers(1, &layer->fbo); 283 glDeleteTextures(1, &layer->texture); 284 285 delete layer; 286 } 287} 288 289/////////////////////////////////////////////////////////////////////////////// 290// Layers 291/////////////////////////////////////////////////////////////////////////////// 292 293int OpenGLRenderer::saveLayer(float left, float top, float right, float bottom, 294 const SkPaint* p, int flags) { 295 int count = saveSnapshot(); 296 297 int alpha = 255; 298 SkXfermode::Mode mode; 299 300 if (p) { 301 alpha = p->getAlpha(); 302 const bool isMode = SkXfermode::IsMode(p->getXfermode(), &mode); 303 if (!isMode) { 304 // Assume SRC_OVER 305 mode = SkXfermode::kSrcOver_Mode; 306 } 307 } else { 308 mode = SkXfermode::kSrcOver_Mode; 309 } 310 311 createLayer(mSnapshot, left, top, right, bottom, alpha, mode, flags); 312 313 return count; 314} 315 316int OpenGLRenderer::saveLayerAlpha(float left, float top, float right, float bottom, 317 int alpha, int flags) { 318 int count = saveSnapshot(); 319 createLayer(mSnapshot, left, top, right, bottom, alpha, SkXfermode::kSrcOver_Mode, flags); 320 return count; 321} 322 323bool OpenGLRenderer::createLayer(sp<Snapshot> snapshot, float left, float top, 324 float right, float bottom, int alpha, SkXfermode::Mode mode,int flags) { 325 LAYER_LOGD("Requesting layer %fx%f", right - left, bottom - top); 326 LAYER_LOGD("Layer cache size = %d", mLayerCache.getSize()); 327 328 GLuint previousFbo = snapshot->previous.get() ? snapshot->previous->fbo : 0; 329 LayerSize size(right - left, bottom - top); 330 331 Layer* layer = mLayerCache.get(size, previousFbo); 332 if (!layer) { 333 return false; 334 } 335 336 glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo); 337 338 // Clear the FBO 339 glDisable(GL_SCISSOR_TEST); 340 glClearColor(0.0f, 0.0f, 0.0f, 0.0f); 341 glClear(GL_COLOR_BUFFER_BIT); 342 glEnable(GL_SCISSOR_TEST); 343 344 // Save the layer in the snapshot 345 snapshot->flags |= Snapshot::kFlagIsLayer; 346 layer->mode = mode; 347 layer->alpha = alpha / 255.0f; 348 layer->layer.set(left, top, right, bottom); 349 350 snapshot->layer = layer; 351 snapshot->fbo = layer->fbo; 352 353 // Creates a new snapshot to draw into the FBO 354 saveSnapshot(); 355 // TODO: This doesn't preserve other transformations (check Skia first) 356 mSnapshot->transform.loadTranslate(-left, -top, 0.0f); 357 mSnapshot->setClip(0.0f, 0.0f, right - left, bottom - top); 358 mSnapshot->height = bottom - top; 359 setScissorFromClip(); 360 361 mSnapshot->flags = Snapshot::kFlagDirtyOrtho | Snapshot::kFlagClipSet; 362 mSnapshot->orthoMatrix.load(mOrthoMatrix); 363 364 // Change the ortho projection 365 mOrthoMatrix.loadOrtho(0.0f, right - left, bottom - top, 0.0f, 0.0f, 1.0f); 366 367 return true; 368} 369 370/////////////////////////////////////////////////////////////////////////////// 371// Transforms 372/////////////////////////////////////////////////////////////////////////////// 373 374void OpenGLRenderer::translate(float dx, float dy) { 375 mSnapshot->transform.translate(dx, dy, 0.0f); 376} 377 378void OpenGLRenderer::rotate(float degrees) { 379 mSnapshot->transform.rotate(degrees, 0.0f, 0.0f, 1.0f); 380} 381 382void OpenGLRenderer::scale(float sx, float sy) { 383 mSnapshot->transform.scale(sx, sy, 1.0f); 384} 385 386void OpenGLRenderer::setMatrix(SkMatrix* matrix) { 387 mSnapshot->transform.load(*matrix); 388} 389 390void OpenGLRenderer::getMatrix(SkMatrix* matrix) { 391 mSnapshot->transform.copyTo(*matrix); 392} 393 394void OpenGLRenderer::concatMatrix(SkMatrix* matrix) { 395 mat4 m(*matrix); 396 mSnapshot->transform.multiply(m); 397} 398 399/////////////////////////////////////////////////////////////////////////////// 400// Clipping 401/////////////////////////////////////////////////////////////////////////////// 402 403void OpenGLRenderer::setScissorFromClip() { 404 const Rect& clip = mSnapshot->clipRect; 405 glScissor(clip.left, mSnapshot->height - clip.bottom, clip.getWidth(), clip.getHeight()); 406} 407 408const Rect& OpenGLRenderer::getClipBounds() { 409 return mSnapshot->getLocalClip(); 410} 411 412bool OpenGLRenderer::quickReject(float left, float top, float right, float bottom) { 413 Rect r(left, top, right, bottom); 414 mSnapshot->transform.mapRect(r); 415 return !mSnapshot->clipRect.intersects(r); 416} 417 418bool OpenGLRenderer::clipRect(float left, float top, float right, float bottom, SkRegion::Op op) { 419 bool clipped = mSnapshot->clip(left, top, right, bottom, op); 420 if (clipped) { 421 setScissorFromClip(); 422 } 423 return !mSnapshot->clipRect.isEmpty(); 424} 425 426/////////////////////////////////////////////////////////////////////////////// 427// Drawing 428/////////////////////////////////////////////////////////////////////////////// 429 430void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, float left, float top, const SkPaint* paint) { 431 const float right = left + bitmap->width(); 432 const float bottom = top + bitmap->height(); 433 434 if (quickReject(left, top, right, bottom)) { 435 return; 436 } 437 438 glActiveTexture(GL_TEXTURE0); 439 const Texture* texture = mTextureCache.get(bitmap); 440 if (!texture) return; 441 const AutoTexture autoCleanup(texture); 442 443 drawTextureRect(left, top, right, bottom, texture, paint); 444} 445 446void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, const SkMatrix* matrix, const SkPaint* paint) { 447 Rect r(0.0f, 0.0f, bitmap->width(), bitmap->height()); 448 const mat4 transform(*matrix); 449 transform.mapRect(r); 450 451 if (quickReject(r.left, r.top, r.right, r.bottom)) { 452 return; 453 } 454 455 glActiveTexture(GL_TEXTURE0); 456 const Texture* texture = mTextureCache.get(bitmap); 457 if (!texture) return; 458 const AutoTexture autoCleanup(texture); 459 460 drawTextureRect(r.left, r.top, r.right, r.bottom, texture, paint); 461} 462 463void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, 464 float srcLeft, float srcTop, float srcRight, float srcBottom, 465 float dstLeft, float dstTop, float dstRight, float dstBottom, 466 const SkPaint* paint) { 467 if (quickReject(dstLeft, dstTop, dstRight, dstBottom)) { 468 return; 469 } 470 471 glActiveTexture(GL_TEXTURE0); 472 const Texture* texture = mTextureCache.get(bitmap); 473 if (!texture) return; 474 const AutoTexture autoCleanup(texture); 475 476 const float width = texture->width; 477 const float height = texture->height; 478 479 const float u1 = srcLeft / width; 480 const float v1 = srcTop / height; 481 const float u2 = srcRight / width; 482 const float v2 = srcBottom / height; 483 484 resetDrawTextureTexCoords(u1, v1, u2, v2); 485 486 drawTextureRect(dstLeft, dstTop, dstRight, dstBottom, texture, paint); 487 488 resetDrawTextureTexCoords(0.0f, 0.0f, 1.0f, 1.0f); 489} 490 491void OpenGLRenderer::drawPatch(SkBitmap* bitmap, Res_png_9patch* patch, 492 float left, float top, float right, float bottom, const SkPaint* paint) { 493 if (quickReject(left, top, right, bottom)) { 494 return; 495 } 496 497 glActiveTexture(GL_TEXTURE0); 498 const Texture* texture = mTextureCache.get(bitmap); 499 if (!texture) return; 500 const AutoTexture autoCleanup(texture); 501 502 int alpha; 503 SkXfermode::Mode mode; 504 getAlphaAndMode(paint, &alpha, &mode); 505 506 Patch* mesh = mPatchCache.get(patch); 507 mesh->updateVertices(bitmap, left, top, right, bottom, 508 &patch->xDivs[0], &patch->yDivs[0], patch->numXDivs, patch->numYDivs); 509 510 // Specify right and bottom as +1.0f from left/top to prevent scaling since the 511 // patch mesh already defines the final size 512 drawTextureMesh(left, top, left + 1.0f, top + 1.0f, texture->id, alpha / 255.0f, 513 mode, texture->blend, &mesh->vertices[0].position[0], 514 &mesh->vertices[0].texture[0], mesh->indices, mesh->indicesCount); 515} 516 517void OpenGLRenderer::drawColor(int color, SkXfermode::Mode mode) { 518 const Rect& clip = mSnapshot->clipRect; 519 drawColorRect(clip.left, clip.top, clip.right, clip.bottom, color, mode, true); 520} 521 522void OpenGLRenderer::drawRect(float left, float top, float right, float bottom, const SkPaint* p) { 523 if (quickReject(left, top, right, bottom)) { 524 return; 525 } 526 527 SkXfermode::Mode mode; 528 529 const bool isMode = SkXfermode::IsMode(p->getXfermode(), &mode); 530 if (!isMode) { 531 // Assume SRC_OVER 532 mode = SkXfermode::kSrcOver_Mode; 533 } 534 535 // Skia draws using the color's alpha channel if < 255 536 // Otherwise, it uses the paint's alpha 537 int color = p->getColor(); 538 if (((color >> 24) & 0xff) == 255) { 539 color |= p->getAlpha() << 24; 540 } 541 542 drawColorRect(left, top, right, bottom, color, mode); 543} 544 545#define kStdStrikeThru_Offset (-6.0f / 21.0f) 546#define kStdUnderline_Offset (1.0f / 9.0f) 547#define kStdUnderline_Thickness (1.0f / 18.0f) 548 549void OpenGLRenderer::drawText(const char* text, int bytesCount, int count, 550 float x, float y, SkPaint* paint) { 551 if (text == NULL || count == 0 || (paint->getAlpha() == 0 && paint->getXfermode() == NULL)) { 552 return; 553 } 554 555 float length = -1.0f; 556 switch (paint->getTextAlign()) { 557 case SkPaint::kCenter_Align: 558 length = paint->measureText(text, bytesCount); 559 x -= length / 2.0f; 560 break; 561 case SkPaint::kRight_Align: 562 length = paint->measureText(text, bytesCount); 563 x -= length; 564 break; 565 default: 566 break; 567 } 568 569 int alpha; 570 SkXfermode::Mode mode; 571 getAlphaAndMode(paint, &alpha, &mode); 572 573 uint32_t color = paint->getColor(); 574 const GLfloat a = alpha / 255.0f; 575 const GLfloat r = a * ((color >> 16) & 0xFF) / 255.0f; 576 const GLfloat g = a * ((color >> 8) & 0xFF) / 255.0f; 577 const GLfloat b = a * ((color ) & 0xFF) / 255.0f; 578 579 mModelView.loadIdentity(); 580 581 GLuint textureUnit = 0; 582 // Needs to be set prior to calling FontRenderer::getTexture() 583 glActiveTexture(gTextureUnits[textureUnit]); 584 585 ProgramDescription description; 586 description.hasTexture = true; 587 description.hasAlpha8Texture = true; 588 if (mShader) { 589 mShader->describe(description, mExtensions); 590 } 591 if (mColorFilter) { 592 mColorFilter->describe(description, mExtensions); 593 } 594 595 useProgram(mProgramCache.get(description)); 596 mCurrentProgram->set(mOrthoMatrix, mModelView, mSnapshot->transform); 597 598 // Text is always blended, no need to check the shader 599 chooseBlending(true, mode); 600 bindTexture(mFontRenderer.getTexture(), GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE, textureUnit); 601 glUniform1i(mCurrentProgram->getUniform("sampler"), textureUnit); 602 603 int texCoordsSlot = mCurrentProgram->getAttrib("texCoords"); 604 glEnableVertexAttribArray(texCoordsSlot); 605 606 // Always premultiplied 607 glUniform4f(mCurrentProgram->color, r, g, b, a); 608 609 textureUnit++; 610 // Setup attributes and uniforms required by the shaders 611 if (mShader) { 612 mShader->setupProgram(mCurrentProgram, mModelView, *mSnapshot, &textureUnit); 613 } 614 if (mColorFilter) { 615 mColorFilter->setupProgram(mCurrentProgram); 616 } 617 618 const Rect& clip = mSnapshot->getLocalClip(); 619 mFontRenderer.setFont(paint, SkTypeface::UniqueID(paint->getTypeface()), paint->getTextSize()); 620 mFontRenderer.renderText(paint, &clip, text, 0, bytesCount, count, x, y); 621 622 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); 623 glDisableVertexAttribArray(texCoordsSlot); 624 625 // Handle underline and strike-through 626 uint32_t flags = paint->getFlags(); 627 if (flags & (SkPaint::kUnderlineText_Flag | SkPaint::kStrikeThruText_Flag)) { 628 float underlineWidth = length; 629 // If length is > 0.0f, we already measured the text for the text alignment 630 if (length <= 0.0f) { 631 underlineWidth = paint->measureText(text, bytesCount); 632 } 633 634 float offsetX = 0; 635 switch (paint->getTextAlign()) { 636 case SkPaint::kCenter_Align: 637 offsetX = underlineWidth * 0.5f; 638 break; 639 case SkPaint::kRight_Align: 640 offsetX = underlineWidth; 641 break; 642 default: 643 break; 644 } 645 646 if (underlineWidth > 0.0f) { 647 float textSize = paint->getTextSize(); 648 float height = textSize * kStdUnderline_Thickness; 649 650 float left = x - offsetX; 651 float top = 0.0f; 652 float right = left + underlineWidth; 653 float bottom = 0.0f; 654 655 if (flags & SkPaint::kUnderlineText_Flag) { 656 top = y + textSize * kStdUnderline_Offset; 657 bottom = top + height; 658 drawRect(left, top, right, bottom, paint); 659 } 660 661 if (flags & SkPaint::kStrikeThruText_Flag) { 662 top = y + textSize * kStdStrikeThru_Offset; 663 bottom = top + height; 664 drawRect(left, top, right, bottom, paint); 665 } 666 } 667 } 668} 669 670void OpenGLRenderer::drawPath(SkPath* path, SkPaint* paint) { 671 GLuint textureUnit = 0; 672 glActiveTexture(gTextureUnits[textureUnit]); 673 674 const PathTexture* texture = mPathCache.get(path, paint); 675 if (!texture) return; 676 const AutoTexture autoCleanup(texture); 677 678 int alpha; 679 SkXfermode::Mode mode; 680 getAlphaAndMode(paint, &alpha, &mode); 681 682 uint32_t color = paint->getColor(); 683 const GLfloat a = alpha / 255.0f; 684 const GLfloat r = a * ((color >> 16) & 0xFF) / 255.0f; 685 const GLfloat g = a * ((color >> 8) & 0xFF) / 255.0f; 686 const GLfloat b = a * ((color ) & 0xFF) / 255.0f; 687 688 // Describe the required shaders 689 ProgramDescription description; 690 description.hasTexture = true; 691 description.hasAlpha8Texture = true; 692 if (mShader) { 693 mShader->describe(description, mExtensions); 694 } 695 if (mColorFilter) { 696 mColorFilter->describe(description, mExtensions); 697 } 698 699 // Build and use the appropriate shader 700 useProgram(mProgramCache.get(description)); 701 702 // Setup the blending mode 703 chooseBlending(true, mode); 704 bindTexture(texture->id, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE, textureUnit); 705 glUniform1i(mCurrentProgram->getUniform("sampler"), textureUnit); 706 707 int texCoordsSlot = mCurrentProgram->getAttrib("texCoords"); 708 glEnableVertexAttribArray(texCoordsSlot); 709 710 // Setup attributes 711 glVertexAttribPointer(mCurrentProgram->position, 2, GL_FLOAT, GL_FALSE, 712 gMeshStride, &mMeshVertices[0].position[0]); 713 glVertexAttribPointer(texCoordsSlot, 2, GL_FLOAT, GL_FALSE, 714 gMeshStride, &mMeshVertices[0].texture[0]); 715 716 // Setup uniforms 717 mModelView.loadTranslate(texture->left - texture->offset, 718 texture->top - texture->offset, 0.0f); 719 mModelView.scale(texture->width, texture->height, 1.0f); 720 mCurrentProgram->set(mOrthoMatrix, mModelView, mSnapshot->transform); 721 722 glUniform4f(mCurrentProgram->color, r, g, b, a); 723 724 textureUnit++; 725 // Setup attributes and uniforms required by the shaders 726 if (mShader) { 727 mShader->setupProgram(mCurrentProgram, mModelView, *mSnapshot, &textureUnit); 728 } 729 if (mColorFilter) { 730 mColorFilter->setupProgram(mCurrentProgram); 731 } 732 733 // Draw the mesh 734 glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount); 735 736 glDisableVertexAttribArray(texCoordsSlot); 737} 738 739/////////////////////////////////////////////////////////////////////////////// 740// Shaders 741/////////////////////////////////////////////////////////////////////////////// 742 743void OpenGLRenderer::resetShader() { 744 mShader = NULL; 745} 746 747void OpenGLRenderer::setupShader(SkiaShader* shader) { 748 mShader = shader; 749 if (mShader) { 750 mShader->set(&mTextureCache, &mGradientCache); 751 } 752} 753 754/////////////////////////////////////////////////////////////////////////////// 755// Color filters 756/////////////////////////////////////////////////////////////////////////////// 757 758void OpenGLRenderer::resetColorFilter() { 759 mColorFilter = NULL; 760} 761 762void OpenGLRenderer::setupColorFilter(SkiaColorFilter* filter) { 763 mColorFilter = filter; 764} 765 766/////////////////////////////////////////////////////////////////////////////// 767// Drawing implementation 768/////////////////////////////////////////////////////////////////////////////// 769 770void OpenGLRenderer::drawColorRect(float left, float top, float right, float bottom, 771 int color, SkXfermode::Mode mode, bool ignoreTransform) { 772 // If a shader is set, preserve only the alpha 773 if (mShader) { 774 color |= 0x00ffffff; 775 } 776 777 // Render using pre-multiplied alpha 778 const int alpha = (color >> 24) & 0xFF; 779 const GLfloat a = alpha / 255.0f; 780 const GLfloat r = a * ((color >> 16) & 0xFF) / 255.0f; 781 const GLfloat g = a * ((color >> 8) & 0xFF) / 255.0f; 782 const GLfloat b = a * ((color ) & 0xFF) / 255.0f; 783 784 GLuint textureUnit = 0; 785 786 // Setup the blending mode 787 chooseBlending(alpha < 255 || (mShader && mShader->blend()), mode); 788 789 // Describe the required shaders 790 ProgramDescription description; 791 if (mShader) { 792 mShader->describe(description, mExtensions); 793 } 794 if (mColorFilter) { 795 mColorFilter->describe(description, mExtensions); 796 } 797 798 // Build and use the appropriate shader 799 useProgram(mProgramCache.get(description)); 800 801 // Setup attributes 802 glVertexAttribPointer(mCurrentProgram->position, 2, GL_FLOAT, GL_FALSE, 803 gMeshStride, &mMeshVertices[0].position[0]); 804 805 // Setup uniforms 806 mModelView.loadTranslate(left, top, 0.0f); 807 mModelView.scale(right - left, bottom - top, 1.0f); 808 if (!ignoreTransform) { 809 mCurrentProgram->set(mOrthoMatrix, mModelView, mSnapshot->transform); 810 } else { 811 mat4 identity; 812 mCurrentProgram->set(mOrthoMatrix, mModelView, identity); 813 } 814 glUniform4f(mCurrentProgram->color, r, g, b, a); 815 816 // Setup attributes and uniforms required by the shaders 817 if (mShader) { 818 mShader->setupProgram(mCurrentProgram, mModelView, *mSnapshot, &textureUnit); 819 } 820 if (mColorFilter) { 821 mColorFilter->setupProgram(mCurrentProgram); 822 } 823 824 // Draw the mesh 825 glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount); 826} 827 828void OpenGLRenderer::drawTextureRect(float left, float top, float right, float bottom, 829 const Texture* texture, const SkPaint* paint) { 830 int alpha; 831 SkXfermode::Mode mode; 832 getAlphaAndMode(paint, &alpha, &mode); 833 834 drawTextureMesh(left, top, right, bottom, texture->id, alpha / 255.0f, mode, texture->blend, 835 &mMeshVertices[0].position[0], &mMeshVertices[0].texture[0], NULL); 836} 837 838void OpenGLRenderer::drawTextureRect(float left, float top, float right, float bottom, 839 GLuint texture, float alpha, SkXfermode::Mode mode, bool blend) { 840 drawTextureMesh(left, top, right, bottom, texture, alpha, mode, blend, 841 &mMeshVertices[0].position[0], &mMeshVertices[0].texture[0], NULL); 842} 843 844void OpenGLRenderer::drawTextureMesh(float left, float top, float right, float bottom, 845 GLuint texture, float alpha, SkXfermode::Mode mode, bool blend, 846 GLvoid* vertices, GLvoid* texCoords, GLvoid* indices, GLsizei elementsCount) { 847 ProgramDescription description; 848 description.hasTexture = true; 849 if (mColorFilter) { 850 mColorFilter->describe(description, mExtensions); 851 } 852 853 mModelView.loadTranslate(left, top, 0.0f); 854 mModelView.scale(right - left, bottom - top, 1.0f); 855 856 useProgram(mProgramCache.get(description)); 857 mCurrentProgram->set(mOrthoMatrix, mModelView, mSnapshot->transform); 858 859 chooseBlending(blend || alpha < 1.0f, mode); 860 861 // Texture 862 bindTexture(texture, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE, 0); 863 glUniform1i(mCurrentProgram->getUniform("sampler"), 0); 864 865 // Always premultiplied 866 glUniform4f(mCurrentProgram->color, alpha, alpha, alpha, alpha); 867 868 // Mesh 869 int texCoordsSlot = mCurrentProgram->getAttrib("texCoords"); 870 glEnableVertexAttribArray(texCoordsSlot); 871 glVertexAttribPointer(mCurrentProgram->position, 2, GL_FLOAT, GL_FALSE, 872 gMeshStride, vertices); 873 glVertexAttribPointer(texCoordsSlot, 2, GL_FLOAT, GL_FALSE, gMeshStride, texCoords); 874 875 // Color filter 876 if (mColorFilter) { 877 mColorFilter->setupProgram(mCurrentProgram); 878 } 879 880 if (!indices) { 881 glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount); 882 } else { 883 glDrawElements(GL_TRIANGLES, elementsCount, GL_UNSIGNED_SHORT, indices); 884 } 885 glDisableVertexAttribArray(texCoordsSlot); 886} 887 888void OpenGLRenderer::chooseBlending(bool blend, SkXfermode::Mode mode, bool isPremultiplied) { 889 blend = blend || mode != SkXfermode::kSrcOver_Mode; 890 if (blend) { 891 if (!mBlend) { 892 glEnable(GL_BLEND); 893 } 894 895 GLenum sourceMode = gBlends[mode].src; 896 GLenum destMode = gBlends[mode].dst; 897 if (!isPremultiplied && sourceMode == GL_ONE) { 898 sourceMode = GL_SRC_ALPHA; 899 } 900 901 if (sourceMode != mLastSrcMode || destMode != mLastDstMode) { 902 glBlendFunc(sourceMode, destMode); 903 mLastSrcMode = sourceMode; 904 mLastDstMode = destMode; 905 } 906 } else if (mBlend) { 907 glDisable(GL_BLEND); 908 } 909 mBlend = blend; 910} 911 912bool OpenGLRenderer::useProgram(Program* program) { 913 if (!program->isInUse()) { 914 if (mCurrentProgram != NULL) mCurrentProgram->remove(); 915 program->use(); 916 mCurrentProgram = program; 917 return false; 918 } 919 return true; 920} 921 922void OpenGLRenderer::resetDrawTextureTexCoords(float u1, float v1, float u2, float v2) { 923 TextureVertex* v = &mMeshVertices[0]; 924 TextureVertex::setUV(v++, u1, v1); 925 TextureVertex::setUV(v++, u2, v1); 926 TextureVertex::setUV(v++, u1, v2); 927 TextureVertex::setUV(v++, u2, v2); 928} 929 930void OpenGLRenderer::getAlphaAndMode(const SkPaint* paint, int* alpha, SkXfermode::Mode* mode) { 931 if (paint) { 932 const bool isMode = SkXfermode::IsMode(paint->getXfermode(), mode); 933 if (!isMode) { 934 // Assume SRC_OVER 935 *mode = SkXfermode::kSrcOver_Mode; 936 } 937 938 // Skia draws using the color's alpha channel if < 255 939 // Otherwise, it uses the paint's alpha 940 int color = paint->getColor(); 941 *alpha = (color >> 24) & 0xFF; 942 if (*alpha == 255) { 943 *alpha = paint->getAlpha(); 944 } 945 } else { 946 *mode = SkXfermode::kSrcOver_Mode; 947 *alpha = 255; 948 } 949} 950 951void OpenGLRenderer::bindTexture(GLuint texture, GLenum wrapS, GLenum wrapT, GLuint textureUnit) { 952 glActiveTexture(gTextureUnits[textureUnit]); 953 glBindTexture(GL_TEXTURE_2D, texture); 954 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrapS); 955 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrapT); 956} 957 958}; // namespace uirenderer 959}; // namespace android 960