OpenGLRenderer.cpp revision 81ab046a1127bd2ad397e6d1c6f8021b202a97ff
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 <utils/Log.h> 27 28#include "OpenGLRenderer.h" 29 30namespace android { 31namespace uirenderer { 32 33/////////////////////////////////////////////////////////////////////////////// 34// Defines 35/////////////////////////////////////////////////////////////////////////////// 36 37#define REQUIRED_TEXTURE_UNITS_COUNT 3 38 39// Generates simple and textured vertices 40#define FV(x, y, u, v) { { x, y }, { u, v } } 41 42/////////////////////////////////////////////////////////////////////////////// 43// Globals 44/////////////////////////////////////////////////////////////////////////////// 45 46// This array is never used directly but used as a memcpy source in the 47// OpenGLRenderer constructor 48static const TextureVertex gMeshVertices[] = { 49 FV(0.0f, 0.0f, 0.0f, 0.0f), 50 FV(1.0f, 0.0f, 1.0f, 0.0f), 51 FV(0.0f, 1.0f, 0.0f, 1.0f), 52 FV(1.0f, 1.0f, 1.0f, 1.0f) 53}; 54static const GLsizei gMeshStride = sizeof(TextureVertex); 55static const GLsizei gMeshCount = 4; 56 57/** 58 * Structure mapping Skia xfermodes to OpenGL blending factors. 59 */ 60struct Blender { 61 SkXfermode::Mode mode; 62 GLenum src; 63 GLenum dst; 64}; // struct Blender 65 66// In this array, the index of each Blender equals the value of the first 67// entry. For instance, gBlends[1] == gBlends[SkXfermode::kSrc_Mode] 68static const Blender gBlends[] = { 69 { SkXfermode::kClear_Mode, GL_ZERO, GL_ZERO }, 70 { SkXfermode::kSrc_Mode, GL_ONE, GL_ZERO }, 71 { SkXfermode::kDst_Mode, GL_ZERO, GL_ONE }, 72 { SkXfermode::kSrcOver_Mode, GL_ONE, GL_ONE_MINUS_SRC_ALPHA }, 73 { SkXfermode::kDstOver_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ONE }, 74 { SkXfermode::kSrcIn_Mode, GL_DST_ALPHA, GL_ZERO }, 75 { SkXfermode::kDstIn_Mode, GL_ZERO, GL_SRC_ALPHA }, 76 { SkXfermode::kSrcOut_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ZERO }, 77 { SkXfermode::kDstOut_Mode, GL_ZERO, GL_ONE_MINUS_SRC_ALPHA }, 78 { SkXfermode::kSrcATop_Mode, GL_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA }, 79 { SkXfermode::kDstATop_Mode, GL_ONE_MINUS_DST_ALPHA, GL_SRC_ALPHA }, 80 { SkXfermode::kXor_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA } 81}; 82 83static const Blender gBlendsSwap[] = { 84 { SkXfermode::kClear_Mode, GL_ZERO, GL_ZERO }, 85 { SkXfermode::kSrc_Mode, GL_ZERO, GL_ONE }, 86 { SkXfermode::kDst_Mode, GL_ONE, GL_ZERO }, 87 { SkXfermode::kSrcOver_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ONE }, 88 { SkXfermode::kDstOver_Mode, GL_ONE, GL_ONE_MINUS_SRC_ALPHA }, 89 { SkXfermode::kSrcIn_Mode, GL_ZERO, GL_SRC_ALPHA }, 90 { SkXfermode::kDstIn_Mode, GL_DST_ALPHA, GL_ZERO }, 91 { SkXfermode::kSrcOut_Mode, GL_ZERO, GL_ONE_MINUS_SRC_ALPHA }, 92 { SkXfermode::kDstOut_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ZERO }, 93 { SkXfermode::kSrcATop_Mode, GL_ONE_MINUS_DST_ALPHA, GL_SRC_ALPHA }, 94 { SkXfermode::kDstATop_Mode, GL_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA }, 95 { SkXfermode::kXor_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA } 96}; 97 98static const GLenum gTextureUnits[] = { 99 GL_TEXTURE0, 100 GL_TEXTURE1, 101 GL_TEXTURE2 102}; 103 104/////////////////////////////////////////////////////////////////////////////// 105// Constructors/destructor 106/////////////////////////////////////////////////////////////////////////////// 107 108OpenGLRenderer::OpenGLRenderer(): mCaches(Caches::getInstance()) { 109 LOGD("Create OpenGLRenderer"); 110 111 mShader = NULL; 112 mColorFilter = NULL; 113 mHasShadow = false; 114 115 memcpy(mMeshVertices, gMeshVertices, sizeof(gMeshVertices)); 116 117 mFirstSnapshot = new Snapshot; 118 119 GLint maxTextureUnits; 120 glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &maxTextureUnits); 121 if (maxTextureUnits < REQUIRED_TEXTURE_UNITS_COUNT) { 122 LOGW("At least %d texture units are required!", REQUIRED_TEXTURE_UNITS_COUNT); 123 } 124} 125 126OpenGLRenderer::~OpenGLRenderer() { 127 LOGD("Destroy OpenGLRenderer"); 128} 129 130/////////////////////////////////////////////////////////////////////////////// 131// Setup 132/////////////////////////////////////////////////////////////////////////////// 133 134void OpenGLRenderer::setViewport(int width, int height) { 135 glViewport(0, 0, width, height); 136 mOrthoMatrix.loadOrtho(0, width, height, 0, -1, 1); 137 138 mWidth = width; 139 mHeight = height; 140} 141 142void OpenGLRenderer::prepare() { 143 mSnapshot = new Snapshot(mFirstSnapshot, 144 SkCanvas::kMatrix_SaveFlag | SkCanvas::kClip_SaveFlag); 145 mSaveCount = 1; 146 147 glViewport(0, 0, mWidth, mHeight); 148 149 glDisable(GL_DITHER); 150 glDisable(GL_SCISSOR_TEST); 151 152 glClearColor(0.0f, 0.0f, 0.0f, 0.0f); 153 glClear(GL_COLOR_BUFFER_BIT); 154 155 glEnable(GL_SCISSOR_TEST); 156 glScissor(0, 0, mWidth, mHeight); 157 158 mSnapshot->setClip(0.0f, 0.0f, mWidth, mHeight); 159} 160 161void OpenGLRenderer::acquireContext() { 162 if (mCaches.currentProgram) { 163 if (mCaches.currentProgram->isInUse()) { 164 mCaches.currentProgram->remove(); 165 mCaches.currentProgram = NULL; 166 } 167 } 168} 169 170void OpenGLRenderer::releaseContext() { 171 glViewport(0, 0, mWidth, mHeight); 172 173 glEnable(GL_SCISSOR_TEST); 174 setScissorFromClip(); 175 176 glDisable(GL_DITHER); 177 178 glBindFramebuffer(GL_FRAMEBUFFER, 0); 179 180 if (mCaches.blend) { 181 glEnable(GL_BLEND); 182 glBlendFunc(mCaches.lastSrcMode, mCaches.lastDstMode); 183 glBlendEquation(GL_FUNC_ADD); 184 } else { 185 glDisable(GL_BLEND); 186 } 187} 188 189/////////////////////////////////////////////////////////////////////////////// 190// State management 191/////////////////////////////////////////////////////////////////////////////// 192 193int OpenGLRenderer::getSaveCount() const { 194 return mSaveCount; 195} 196 197int OpenGLRenderer::save(int flags) { 198 return saveSnapshot(flags); 199} 200 201void OpenGLRenderer::restore() { 202 if (mSaveCount > 1) { 203 restoreSnapshot(); 204 } 205} 206 207void OpenGLRenderer::restoreToCount(int saveCount) { 208 if (saveCount < 1) saveCount = 1; 209 210 while (mSaveCount > saveCount) { 211 restoreSnapshot(); 212 } 213} 214 215int OpenGLRenderer::saveSnapshot(int flags) { 216 mSnapshot = new Snapshot(mSnapshot, flags); 217 return mSaveCount++; 218} 219 220bool OpenGLRenderer::restoreSnapshot() { 221 bool restoreClip = mSnapshot->flags & Snapshot::kFlagClipSet; 222 bool restoreLayer = mSnapshot->flags & Snapshot::kFlagIsLayer; 223 224 sp<Snapshot> current = mSnapshot; 225 sp<Snapshot> previous = mSnapshot->previous; 226 227 mSaveCount--; 228 mSnapshot = previous; 229 230 if (restoreLayer) { 231 composeLayer(current, previous); 232 } 233 234 if (restoreClip) { 235 setScissorFromClip(); 236 } 237 238 return restoreClip; 239} 240 241/////////////////////////////////////////////////////////////////////////////// 242// Layers 243/////////////////////////////////////////////////////////////////////////////// 244 245int OpenGLRenderer::saveLayer(float left, float top, float right, float bottom, 246 const SkPaint* p, int flags) { 247 int count = saveSnapshot(flags); 248 249 int alpha = 255; 250 SkXfermode::Mode mode; 251 252 if (p) { 253 alpha = p->getAlpha(); 254 if (!mExtensions.hasFramebufferFetch()) { 255 const bool isMode = SkXfermode::IsMode(p->getXfermode(), &mode); 256 if (!isMode) { 257 // Assume SRC_OVER 258 mode = SkXfermode::kSrcOver_Mode; 259 } 260 } else { 261 mode = getXfermode(p->getXfermode()); 262 } 263 } else { 264 mode = SkXfermode::kSrcOver_Mode; 265 } 266 267 createLayer(mSnapshot, left, top, right, bottom, alpha, mode, flags); 268 269 return count; 270} 271 272int OpenGLRenderer::saveLayerAlpha(float left, float top, float right, float bottom, 273 int alpha, int flags) { 274 if (alpha == 0xff) { 275 return saveLayer(left, top, right, bottom, NULL, flags); 276 } else { 277 SkPaint paint; 278 paint.setAlpha(alpha); 279 return saveLayer(left, top, right, bottom, &paint, flags); 280 } 281} 282 283 284bool OpenGLRenderer::createLayer(sp<Snapshot> snapshot, float left, float top, 285 float right, float bottom, int alpha, SkXfermode::Mode mode,int flags) { 286 LAYER_LOGD("Requesting layer %fx%f", right - left, bottom - top); 287 LAYER_LOGD("Layer cache size = %d", mCaches.layerCache.getSize()); 288 289 // Window coordinates of the layer 290 Rect bounds(left, top, right, bottom); 291 mSnapshot->transform->mapRect(bounds); 292 293 // Layers only make sense if they are in the framebuffer's bounds 294 bounds.intersect(*mSnapshot->clipRect); 295 if (bounds.isEmpty()) return false; 296 297 LayerSize size(bounds.getWidth(), bounds.getHeight()); 298 Layer* layer = mCaches.layerCache.get(size); 299 if (!layer) { 300 return false; 301 } 302 303 layer->mode = mode; 304 layer->alpha = alpha; 305 layer->layer.set(bounds); 306 307 // Save the layer in the snapshot 308 snapshot->flags |= Snapshot::kFlagIsLayer; 309 snapshot->layer = layer; 310 311 // Copy the framebuffer into the layer 312 glBindTexture(GL_TEXTURE_2D, layer->texture); 313 glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, bounds.left, mHeight - bounds.bottom, 314 bounds.getWidth(), bounds.getHeight(), 0); 315 316 if (flags & SkCanvas::kClipToLayer_SaveFlag) { 317 if (mSnapshot->clipTransformed(bounds)) setScissorFromClip(); 318 } 319 320 // Enqueue the buffer coordinates to clear the corresponding region later 321 mLayers.push(new Rect(bounds)); 322 323 return true; 324} 325 326void OpenGLRenderer::composeLayer(sp<Snapshot> current, sp<Snapshot> previous) { 327 if (!current->layer) { 328 LOGE("Attempting to compose a layer that does not exist"); 329 return; 330 } 331 332 // Restore the clip from the previous snapshot 333 const Rect& clip = *previous->clipRect; 334 glScissor(clip.left, mHeight - clip.bottom, clip.getWidth(), clip.getHeight()); 335 336 Layer* layer = current->layer; 337 const Rect& rect = layer->layer; 338 339 if (layer->alpha < 255) { 340 glEnable(GL_BLEND); 341 glBlendFuncSeparate(GL_ZERO, GL_SRC_ALPHA, GL_DST_ALPHA, GL_ZERO); 342 343 drawColorRect(rect.left, rect.top, rect.right, rect.bottom, 344 layer->alpha << 24, SkXfermode::kSrcOver_Mode, true, true); 345 346 glBlendFunc(mCaches.lastSrcMode, mCaches.lastDstMode); 347 if (!mCaches.blend) { 348 glDisable(GL_BLEND); 349 } 350 } 351 352 // Layers are already drawn with a top-left origin, don't flip the texture 353 resetDrawTextureTexCoords(0.0f, 1.0f, 1.0f, 0.0f); 354 355 drawTextureMesh(rect.left, rect.top, rect.right, rect.bottom, layer->texture, 356 1.0f, layer->mode, layer->blend, &mMeshVertices[0].position[0], 357 &mMeshVertices[0].texture[0], NULL, 0, true, true); 358 359 resetDrawTextureTexCoords(0.0f, 0.0f, 1.0f, 1.0f); 360 361 LayerSize size(rect.getWidth(), rect.getHeight()); 362 // Failing to add the layer to the cache should happen only if the 363 // layer is too large 364 if (!mCaches.layerCache.put(size, layer)) { 365 LAYER_LOGD("Deleting layer"); 366 367 glDeleteTextures(1, &layer->texture); 368 369 delete layer; 370 } 371} 372 373void OpenGLRenderer::clearLayerRegions() { 374 if (mLayers.size() == 0) return; 375 376 for (uint32_t i = 0; i < mLayers.size(); i++) { 377 Rect* bounds = mLayers.itemAt(i); 378 379 // Clear the framebuffer where the layer will draw 380 glScissor(bounds->left, mHeight - bounds->bottom, 381 bounds->getWidth(), bounds->getHeight()); 382 glClearColor(0.0f, 0.0f, 0.0f, 0.0f); 383 glClear(GL_COLOR_BUFFER_BIT); 384 385 delete bounds; 386 } 387 mLayers.clear(); 388 389 // Restore the clip 390 setScissorFromClip(); 391} 392 393/////////////////////////////////////////////////////////////////////////////// 394// Transforms 395/////////////////////////////////////////////////////////////////////////////// 396 397void OpenGLRenderer::translate(float dx, float dy) { 398 mSnapshot->transform->translate(dx, dy, 0.0f); 399} 400 401void OpenGLRenderer::rotate(float degrees) { 402 mSnapshot->transform->rotate(degrees, 0.0f, 0.0f, 1.0f); 403} 404 405void OpenGLRenderer::scale(float sx, float sy) { 406 mSnapshot->transform->scale(sx, sy, 1.0f); 407} 408 409void OpenGLRenderer::setMatrix(SkMatrix* matrix) { 410 mSnapshot->transform->load(*matrix); 411} 412 413void OpenGLRenderer::getMatrix(SkMatrix* matrix) { 414 mSnapshot->transform->copyTo(*matrix); 415} 416 417void OpenGLRenderer::concatMatrix(SkMatrix* matrix) { 418 mat4 m(*matrix); 419 mSnapshot->transform->multiply(m); 420} 421 422/////////////////////////////////////////////////////////////////////////////// 423// Clipping 424/////////////////////////////////////////////////////////////////////////////// 425 426void OpenGLRenderer::setScissorFromClip() { 427 const Rect& clip = *mSnapshot->clipRect; 428 glScissor(clip.left, mHeight - clip.bottom, clip.getWidth(), clip.getHeight()); 429} 430 431const Rect& OpenGLRenderer::getClipBounds() { 432 return mSnapshot->getLocalClip(); 433} 434 435bool OpenGLRenderer::quickReject(float left, float top, float right, float bottom) { 436 Rect r(left, top, right, bottom); 437 mSnapshot->transform->mapRect(r); 438 return !mSnapshot->clipRect->intersects(r); 439} 440 441bool OpenGLRenderer::clipRect(float left, float top, float right, float bottom, SkRegion::Op op) { 442 bool clipped = mSnapshot->clip(left, top, right, bottom, op); 443 if (clipped) { 444 setScissorFromClip(); 445 } 446 return !mSnapshot->clipRect->isEmpty(); 447} 448 449/////////////////////////////////////////////////////////////////////////////// 450// Drawing 451/////////////////////////////////////////////////////////////////////////////// 452 453void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, float left, float top, const SkPaint* paint) { 454 const float right = left + bitmap->width(); 455 const float bottom = top + bitmap->height(); 456 457 if (quickReject(left, top, right, bottom)) { 458 return; 459 } 460 461 glActiveTexture(GL_TEXTURE0); 462 const Texture* texture = mCaches.textureCache.get(bitmap); 463 if (!texture) return; 464 const AutoTexture autoCleanup(texture); 465 466 drawTextureRect(left, top, right, bottom, texture, paint); 467} 468 469void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, const SkMatrix* matrix, const SkPaint* paint) { 470 Rect r(0.0f, 0.0f, bitmap->width(), bitmap->height()); 471 const mat4 transform(*matrix); 472 transform.mapRect(r); 473 474 if (quickReject(r.left, r.top, r.right, r.bottom)) { 475 return; 476 } 477 478 glActiveTexture(GL_TEXTURE0); 479 const Texture* texture = mCaches.textureCache.get(bitmap); 480 if (!texture) return; 481 const AutoTexture autoCleanup(texture); 482 483 drawTextureRect(r.left, r.top, r.right, r.bottom, texture, paint); 484} 485 486void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, 487 float srcLeft, float srcTop, float srcRight, float srcBottom, 488 float dstLeft, float dstTop, float dstRight, float dstBottom, 489 const SkPaint* paint) { 490 if (quickReject(dstLeft, dstTop, dstRight, dstBottom)) { 491 return; 492 } 493 494 glActiveTexture(GL_TEXTURE0); 495 const Texture* texture = mCaches.textureCache.get(bitmap); 496 if (!texture) return; 497 const AutoTexture autoCleanup(texture); 498 499 const float width = texture->width; 500 const float height = texture->height; 501 502 const float u1 = srcLeft / width; 503 const float v1 = srcTop / height; 504 const float u2 = srcRight / width; 505 const float v2 = srcBottom / height; 506 507 resetDrawTextureTexCoords(u1, v1, u2, v2); 508 509 drawTextureRect(dstLeft, dstTop, dstRight, dstBottom, texture, paint); 510 511 resetDrawTextureTexCoords(0.0f, 0.0f, 1.0f, 1.0f); 512} 513 514void OpenGLRenderer::drawPatch(SkBitmap* bitmap, Res_png_9patch* patch, 515 float left, float top, float right, float bottom, const SkPaint* paint) { 516 if (quickReject(left, top, right, bottom)) { 517 return; 518 } 519 520 glActiveTexture(GL_TEXTURE0); 521 const Texture* texture = mCaches.textureCache.get(bitmap); 522 if (!texture) return; 523 const AutoTexture autoCleanup(texture); 524 525 int alpha; 526 SkXfermode::Mode mode; 527 getAlphaAndMode(paint, &alpha, &mode); 528 529 Patch* mesh = mCaches.patchCache.get(patch); 530 mesh->updateVertices(bitmap, left, top, right, bottom, 531 &patch->xDivs[0], &patch->yDivs[0], patch->numXDivs, patch->numYDivs); 532 mesh->dump(); 533 534 // Specify right and bottom as +1.0f from left/top to prevent scaling since the 535 // patch mesh already defines the final size 536 drawTextureMesh(left, top, left + 1.0f, top + 1.0f, texture->id, alpha / 255.0f, 537 mode, texture->blend, &mesh->vertices[0].position[0], 538 &mesh->vertices[0].texture[0], mesh->indices, mesh->indicesCount); 539} 540 541void OpenGLRenderer::drawColor(int color, SkXfermode::Mode mode) { 542 const Rect& clip = *mSnapshot->clipRect; 543 drawColorRect(clip.left, clip.top, clip.right, clip.bottom, color, mode, true); 544} 545 546void OpenGLRenderer::drawRect(float left, float top, float right, float bottom, const SkPaint* p) { 547 if (quickReject(left, top, right, bottom)) { 548 return; 549 } 550 551 SkXfermode::Mode mode; 552 if (!mExtensions.hasFramebufferFetch()) { 553 const bool isMode = SkXfermode::IsMode(p->getXfermode(), &mode); 554 if (!isMode) { 555 // Assume SRC_OVER 556 mode = SkXfermode::kSrcOver_Mode; 557 } 558 } else { 559 mode = getXfermode(p->getXfermode()); 560 } 561 562 // Skia draws using the color's alpha channel if < 255 563 // Otherwise, it uses the paint's alpha 564 int color = p->getColor(); 565 if (((color >> 24) & 0xff) == 255) { 566 color |= p->getAlpha() << 24; 567 } 568 569 drawColorRect(left, top, right, bottom, color, mode); 570} 571 572void OpenGLRenderer::drawText(const char* text, int bytesCount, int count, 573 float x, float y, SkPaint* paint) { 574 if (text == NULL || count == 0 || (paint->getAlpha() == 0 && paint->getXfermode() == NULL)) { 575 return; 576 } 577 paint->setAntiAlias(true); 578 579 float length = -1.0f; 580 switch (paint->getTextAlign()) { 581 case SkPaint::kCenter_Align: 582 length = paint->measureText(text, bytesCount); 583 x -= length / 2.0f; 584 break; 585 case SkPaint::kRight_Align: 586 length = paint->measureText(text, bytesCount); 587 x -= length; 588 break; 589 default: 590 break; 591 } 592 593 int alpha; 594 SkXfermode::Mode mode; 595 getAlphaAndMode(paint, &alpha, &mode); 596 597 uint32_t color = paint->getColor(); 598 const GLfloat a = alpha / 255.0f; 599 const GLfloat r = a * ((color >> 16) & 0xFF) / 255.0f; 600 const GLfloat g = a * ((color >> 8) & 0xFF) / 255.0f; 601 const GLfloat b = a * ((color ) & 0xFF) / 255.0f; 602 603 FontRenderer& fontRenderer = mCaches.fontRenderer.getFontRenderer(paint); 604 fontRenderer.setFont(paint, SkTypeface::UniqueID(paint->getTypeface()), 605 paint->getTextSize()); 606 if (mHasShadow) { 607 glActiveTexture(gTextureUnits[0]); 608 mCaches.dropShadowCache.setFontRenderer(fontRenderer); 609 const ShadowTexture* shadow = mCaches.dropShadowCache.get(paint, text, bytesCount, 610 count, mShadowRadius); 611 const AutoTexture autoCleanup(shadow); 612 613 setupShadow(shadow, x, y, mode, a); 614 615 // Draw the mesh 616 glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount); 617 glDisableVertexAttribArray(mCaches.currentProgram->getAttrib("texCoords")); 618 } 619 620 GLuint textureUnit = 0; 621 glActiveTexture(gTextureUnits[textureUnit]); 622 623 setupTextureAlpha8(fontRenderer.getTexture(), 0, 0, textureUnit, x, y, r, g, b, a, 624 mode, false, true); 625 626 const Rect& clip = mSnapshot->getLocalClip(); 627 clearLayerRegions(); 628 fontRenderer.renderText(paint, &clip, text, 0, bytesCount, count, x, y); 629 630 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); 631 glDisableVertexAttribArray(mCaches.currentProgram->getAttrib("texCoords")); 632 633 drawTextDecorations(text, bytesCount, length, x, y, paint); 634} 635 636void OpenGLRenderer::drawPath(SkPath* path, SkPaint* paint) { 637 GLuint textureUnit = 0; 638 glActiveTexture(gTextureUnits[textureUnit]); 639 640 const PathTexture* texture = mCaches.pathCache.get(path, paint); 641 if (!texture) return; 642 const AutoTexture autoCleanup(texture); 643 644 const float x = texture->left - texture->offset; 645 const float y = texture->top - texture->offset; 646 647 if (quickReject(x, y, x + texture->width, y + texture->height)) { 648 return; 649 } 650 651 int alpha; 652 SkXfermode::Mode mode; 653 getAlphaAndMode(paint, &alpha, &mode); 654 655 uint32_t color = paint->getColor(); 656 const GLfloat a = alpha / 255.0f; 657 const GLfloat r = a * ((color >> 16) & 0xFF) / 255.0f; 658 const GLfloat g = a * ((color >> 8) & 0xFF) / 255.0f; 659 const GLfloat b = a * ((color ) & 0xFF) / 255.0f; 660 661 setupTextureAlpha8(texture, textureUnit, x, y, r, g, b, a, mode, true, true); 662 663 clearLayerRegions(); 664 665 // Draw the mesh 666 glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount); 667 glDisableVertexAttribArray(mCaches.currentProgram->getAttrib("texCoords")); 668} 669 670/////////////////////////////////////////////////////////////////////////////// 671// Shaders 672/////////////////////////////////////////////////////////////////////////////// 673 674void OpenGLRenderer::resetShader() { 675 mShader = NULL; 676} 677 678void OpenGLRenderer::setupShader(SkiaShader* shader) { 679 mShader = shader; 680 if (mShader) { 681 mShader->set(&mCaches.textureCache, &mCaches.gradientCache); 682 } 683} 684 685/////////////////////////////////////////////////////////////////////////////// 686// Color filters 687/////////////////////////////////////////////////////////////////////////////// 688 689void OpenGLRenderer::resetColorFilter() { 690 mColorFilter = NULL; 691} 692 693void OpenGLRenderer::setupColorFilter(SkiaColorFilter* filter) { 694 mColorFilter = filter; 695} 696 697/////////////////////////////////////////////////////////////////////////////// 698// Drop shadow 699/////////////////////////////////////////////////////////////////////////////// 700 701void OpenGLRenderer::resetShadow() { 702 mHasShadow = false; 703} 704 705void OpenGLRenderer::setupShadow(float radius, float dx, float dy, int color) { 706 mHasShadow = true; 707 mShadowRadius = radius; 708 mShadowDx = dx; 709 mShadowDy = dy; 710 mShadowColor = color; 711} 712 713/////////////////////////////////////////////////////////////////////////////// 714// Drawing implementation 715/////////////////////////////////////////////////////////////////////////////// 716 717void OpenGLRenderer::setupShadow(const ShadowTexture* texture, float x, float y, 718 SkXfermode::Mode mode, float alpha) { 719 const float sx = x - texture->left + mShadowDx; 720 const float sy = y - texture->top + mShadowDy; 721 722 const int shadowAlpha = ((mShadowColor >> 24) & 0xFF); 723 const GLfloat a = shadowAlpha < 255 ? shadowAlpha / 255.0f : alpha; 724 const GLfloat r = a * ((mShadowColor >> 16) & 0xFF) / 255.0f; 725 const GLfloat g = a * ((mShadowColor >> 8) & 0xFF) / 255.0f; 726 const GLfloat b = a * ((mShadowColor ) & 0xFF) / 255.0f; 727 728 GLuint textureUnit = 0; 729 setupTextureAlpha8(texture, textureUnit, sx, sy, r, g, b, a, mode, true, false); 730} 731 732void OpenGLRenderer::setupTextureAlpha8(const Texture* texture, GLuint& textureUnit, 733 float x, float y, float r, float g, float b, float a, SkXfermode::Mode mode, 734 bool transforms, bool applyFilters) { 735 setupTextureAlpha8(texture->id, texture->width, texture->height, textureUnit, 736 x, y, r, g, b, a, mode, transforms, applyFilters); 737} 738 739void OpenGLRenderer::setupTextureAlpha8(GLuint texture, uint32_t width, uint32_t height, 740 GLuint& textureUnit, float x, float y, float r, float g, float b, float a, 741 SkXfermode::Mode mode, bool transforms, bool applyFilters) { 742 // Describe the required shaders 743 ProgramDescription description; 744 description.hasTexture = true; 745 description.hasAlpha8Texture = true; 746 747 if (applyFilters) { 748 if (mShader) { 749 mShader->describe(description, mExtensions); 750 } 751 if (mColorFilter) { 752 mColorFilter->describe(description, mExtensions); 753 } 754 } 755 756 // Setup the blending mode 757 chooseBlending(true, mode, description); 758 759 // Build and use the appropriate shader 760 useProgram(mCaches.programCache.get(description)); 761 762 bindTexture(texture, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE, textureUnit); 763 glUniform1i(mCaches.currentProgram->getUniform("sampler"), textureUnit); 764 765 int texCoordsSlot = mCaches.currentProgram->getAttrib("texCoords"); 766 glEnableVertexAttribArray(texCoordsSlot); 767 768 // Setup attributes 769 glVertexAttribPointer(mCaches.currentProgram->position, 2, GL_FLOAT, GL_FALSE, 770 gMeshStride, &mMeshVertices[0].position[0]); 771 glVertexAttribPointer(texCoordsSlot, 2, GL_FLOAT, GL_FALSE, 772 gMeshStride, &mMeshVertices[0].texture[0]); 773 774 // Setup uniforms 775 if (transforms) { 776 mModelView.loadTranslate(x, y, 0.0f); 777 mModelView.scale(width, height, 1.0f); 778 } else { 779 mModelView.loadIdentity(); 780 } 781 mCaches.currentProgram->set(mOrthoMatrix, mModelView, *mSnapshot->transform); 782 glUniform4f(mCaches.currentProgram->color, r, g, b, a); 783 784 textureUnit++; 785 if (applyFilters) { 786 // Setup attributes and uniforms required by the shaders 787 if (mShader) { 788 mShader->setupProgram(mCaches.currentProgram, mModelView, *mSnapshot, &textureUnit); 789 } 790 if (mColorFilter) { 791 mColorFilter->setupProgram(mCaches.currentProgram); 792 } 793 } 794} 795 796// Same values used by Skia 797#define kStdStrikeThru_Offset (-6.0f / 21.0f) 798#define kStdUnderline_Offset (1.0f / 9.0f) 799#define kStdUnderline_Thickness (1.0f / 18.0f) 800 801void OpenGLRenderer::drawTextDecorations(const char* text, int bytesCount, float length, 802 float x, float y, SkPaint* paint) { 803 // Handle underline and strike-through 804 uint32_t flags = paint->getFlags(); 805 if (flags & (SkPaint::kUnderlineText_Flag | SkPaint::kStrikeThruText_Flag)) { 806 float underlineWidth = length; 807 // If length is > 0.0f, we already measured the text for the text alignment 808 if (length <= 0.0f) { 809 underlineWidth = paint->measureText(text, bytesCount); 810 } 811 812 float offsetX = 0; 813 switch (paint->getTextAlign()) { 814 case SkPaint::kCenter_Align: 815 offsetX = underlineWidth * 0.5f; 816 break; 817 case SkPaint::kRight_Align: 818 offsetX = underlineWidth; 819 break; 820 default: 821 break; 822 } 823 824 if (underlineWidth > 0.0f) { 825 float textSize = paint->getTextSize(); 826 float height = textSize * kStdUnderline_Thickness; 827 828 float left = x - offsetX; 829 float top = 0.0f; 830 float right = left + underlineWidth; 831 float bottom = 0.0f; 832 833 if (flags & SkPaint::kUnderlineText_Flag) { 834 top = y + textSize * kStdUnderline_Offset; 835 bottom = top + height; 836 drawRect(left, top, right, bottom, paint); 837 } 838 839 if (flags & SkPaint::kStrikeThruText_Flag) { 840 top = y + textSize * kStdStrikeThru_Offset; 841 bottom = top + height; 842 drawRect(left, top, right, bottom, paint); 843 } 844 } 845 } 846} 847 848void OpenGLRenderer::drawColorRect(float left, float top, float right, float bottom, 849 int color, SkXfermode::Mode mode, bool ignoreTransform, bool ignoreBlending) { 850 clearLayerRegions(); 851 852 // If a shader is set, preserve only the alpha 853 if (mShader) { 854 color |= 0x00ffffff; 855 } 856 857 // Render using pre-multiplied alpha 858 const int alpha = (color >> 24) & 0xFF; 859 const GLfloat a = alpha / 255.0f; 860 const GLfloat r = a * ((color >> 16) & 0xFF) / 255.0f; 861 const GLfloat g = a * ((color >> 8) & 0xFF) / 255.0f; 862 const GLfloat b = a * ((color ) & 0xFF) / 255.0f; 863 864 GLuint textureUnit = 0; 865 866 // Describe the required shaders 867 ProgramDescription description; 868 if (mShader) { 869 mShader->describe(description, mExtensions); 870 } 871 if (mColorFilter) { 872 mColorFilter->describe(description, mExtensions); 873 } 874 875 if (!ignoreBlending) { 876 // Setup the blending mode 877 chooseBlending(alpha < 255 || (mShader && mShader->blend()), mode, description); 878 } 879 880 // Build and use the appropriate shader 881 useProgram(mCaches.programCache.get(description)); 882 883 // Setup attributes 884 glVertexAttribPointer(mCaches.currentProgram->position, 2, GL_FLOAT, GL_FALSE, 885 gMeshStride, &mMeshVertices[0].position[0]); 886 887 // Setup uniforms 888 mModelView.loadTranslate(left, top, 0.0f); 889 mModelView.scale(right - left, bottom - top, 1.0f); 890 if (!ignoreTransform) { 891 mCaches.currentProgram->set(mOrthoMatrix, mModelView, *mSnapshot->transform); 892 } else { 893 mat4 identity; 894 mCaches.currentProgram->set(mOrthoMatrix, mModelView, identity); 895 } 896 glUniform4f(mCaches.currentProgram->color, r, g, b, a); 897 898 // Setup attributes and uniforms required by the shaders 899 if (mShader) { 900 mShader->setupProgram(mCaches.currentProgram, mModelView, *mSnapshot, &textureUnit); 901 } 902 if (mColorFilter) { 903 mColorFilter->setupProgram(mCaches.currentProgram); 904 } 905 906 // Draw the mesh 907 glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount); 908} 909 910void OpenGLRenderer::drawTextureRect(float left, float top, float right, float bottom, 911 const Texture* texture, const SkPaint* paint) { 912 int alpha; 913 SkXfermode::Mode mode; 914 getAlphaAndMode(paint, &alpha, &mode); 915 916 drawTextureMesh(left, top, right, bottom, texture->id, alpha / 255.0f, mode, texture->blend, 917 &mMeshVertices[0].position[0], &mMeshVertices[0].texture[0], NULL); 918} 919 920void OpenGLRenderer::drawTextureRect(float left, float top, float right, float bottom, 921 GLuint texture, float alpha, SkXfermode::Mode mode, bool blend) { 922 drawTextureMesh(left, top, right, bottom, texture, alpha, mode, blend, 923 &mMeshVertices[0].position[0], &mMeshVertices[0].texture[0], NULL); 924} 925 926void OpenGLRenderer::drawTextureMesh(float left, float top, float right, float bottom, 927 GLuint texture, float alpha, SkXfermode::Mode mode, bool blend, 928 GLvoid* vertices, GLvoid* texCoords, GLvoid* indices, GLsizei elementsCount, 929 bool swapSrcDst, bool ignoreTransform) { 930 clearLayerRegions(); 931 932 ProgramDescription description; 933 description.hasTexture = true; 934 if (mColorFilter) { 935 mColorFilter->describe(description, mExtensions); 936 } 937 938 mModelView.loadTranslate(left, top, 0.0f); 939 mModelView.scale(right - left, bottom - top, 1.0f); 940 941 chooseBlending(blend || alpha < 1.0f, mode, description, swapSrcDst); 942 943 useProgram(mCaches.programCache.get(description)); 944 if (!ignoreTransform) { 945 mCaches.currentProgram->set(mOrthoMatrix, mModelView, *mSnapshot->transform); 946 } else { 947 mat4 m; 948 mCaches.currentProgram->set(mOrthoMatrix, mModelView, m); 949 } 950 951 // Texture 952 bindTexture(texture, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE, 0); 953 glUniform1i(mCaches.currentProgram->getUniform("sampler"), 0); 954 955 // Always premultiplied 956 glUniform4f(mCaches.currentProgram->color, alpha, alpha, alpha, alpha); 957 958 // Mesh 959 int texCoordsSlot = mCaches.currentProgram->getAttrib("texCoords"); 960 glEnableVertexAttribArray(texCoordsSlot); 961 glVertexAttribPointer(mCaches.currentProgram->position, 2, GL_FLOAT, GL_FALSE, 962 gMeshStride, vertices); 963 glVertexAttribPointer(texCoordsSlot, 2, GL_FLOAT, GL_FALSE, gMeshStride, texCoords); 964 965 // Color filter 966 if (mColorFilter) { 967 mColorFilter->setupProgram(mCaches.currentProgram); 968 } 969 970 if (!indices) { 971 glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount); 972 } else { 973 glDrawElements(GL_TRIANGLES, elementsCount, GL_UNSIGNED_SHORT, indices); 974 } 975 glDisableVertexAttribArray(texCoordsSlot); 976} 977 978void OpenGLRenderer::chooseBlending(bool blend, SkXfermode::Mode mode, 979 ProgramDescription& description, bool swapSrcDst) { 980 blend = blend || mode != SkXfermode::kSrcOver_Mode; 981 if (blend) { 982 if (mode < SkXfermode::kPlus_Mode) { 983 if (!mCaches.blend) { 984 glEnable(GL_BLEND); 985 } 986 987 GLenum sourceMode = swapSrcDst ? gBlendsSwap[mode].src : gBlends[mode].src; 988 GLenum destMode = swapSrcDst ? gBlendsSwap[mode].dst : gBlends[mode].dst; 989 990 if (sourceMode != mCaches.lastSrcMode || destMode != mCaches.lastDstMode) { 991 glBlendFunc(sourceMode, destMode); 992 mCaches.lastSrcMode = sourceMode; 993 mCaches.lastDstMode = destMode; 994 } 995 } else { 996 // These blend modes are not supported by OpenGL directly and have 997 // to be implemented using shaders. Since the shader will perform 998 // the blending, turn blending off here 999 if (mExtensions.hasFramebufferFetch()) { 1000 description.framebufferMode = mode; 1001 description.swapSrcDst = swapSrcDst; 1002 } 1003 1004 if (mCaches.blend) { 1005 glDisable(GL_BLEND); 1006 } 1007 blend = false; 1008 } 1009 } else if (mCaches.blend) { 1010 glDisable(GL_BLEND); 1011 } 1012 mCaches.blend = blend; 1013} 1014 1015bool OpenGLRenderer::useProgram(Program* program) { 1016 if (!program->isInUse()) { 1017 if (mCaches.currentProgram != NULL) mCaches.currentProgram->remove(); 1018 program->use(); 1019 mCaches.currentProgram = program; 1020 return false; 1021 } 1022 return true; 1023} 1024 1025void OpenGLRenderer::resetDrawTextureTexCoords(float u1, float v1, float u2, float v2) { 1026 TextureVertex* v = &mMeshVertices[0]; 1027 TextureVertex::setUV(v++, u1, v1); 1028 TextureVertex::setUV(v++, u2, v1); 1029 TextureVertex::setUV(v++, u1, v2); 1030 TextureVertex::setUV(v++, u2, v2); 1031} 1032 1033void OpenGLRenderer::getAlphaAndMode(const SkPaint* paint, int* alpha, SkXfermode::Mode* mode) { 1034 if (paint) { 1035 if (!mExtensions.hasFramebufferFetch()) { 1036 const bool isMode = SkXfermode::IsMode(paint->getXfermode(), mode); 1037 if (!isMode) { 1038 // Assume SRC_OVER 1039 *mode = SkXfermode::kSrcOver_Mode; 1040 } 1041 } else { 1042 *mode = getXfermode(paint->getXfermode()); 1043 } 1044 1045 // Skia draws using the color's alpha channel if < 255 1046 // Otherwise, it uses the paint's alpha 1047 int color = paint->getColor(); 1048 *alpha = (color >> 24) & 0xFF; 1049 if (*alpha == 255) { 1050 *alpha = paint->getAlpha(); 1051 } 1052 } else { 1053 *mode = SkXfermode::kSrcOver_Mode; 1054 *alpha = 255; 1055 } 1056} 1057 1058SkXfermode::Mode OpenGLRenderer::getXfermode(SkXfermode* mode) { 1059 if (mode == NULL) { 1060 return SkXfermode::kSrcOver_Mode; 1061 } 1062 return mode->fMode; 1063} 1064 1065void OpenGLRenderer::bindTexture(GLuint texture, GLenum wrapS, GLenum wrapT, GLuint textureUnit) { 1066 glActiveTexture(gTextureUnits[textureUnit]); 1067 glBindTexture(GL_TEXTURE_2D, texture); 1068 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrapS); 1069 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrapT); 1070} 1071 1072}; // namespace uirenderer 1073}; // namespace android 1074