OpenGLRenderer.cpp revision f7f93556c8fcc640ab5adef79d021a80a72a645a
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 25#include <cutils/properties.h> 26#include <utils/Log.h> 27 28#include "OpenGLRenderer.h" 29 30namespace android { 31namespace uirenderer { 32 33/////////////////////////////////////////////////////////////////////////////// 34// Defines 35/////////////////////////////////////////////////////////////////////////////// 36 37// These properties are defined in mega-bytes 38#define PROPERTY_TEXTURE_CACHE_SIZE "ro.hwui.texture_cache_size" 39#define PROPERTY_LAYER_CACHE_SIZE "ro.hwui.layer_cache_size" 40 41#define DEFAULT_TEXTURE_CACHE_SIZE 20 42#define DEFAULT_LAYER_CACHE_SIZE 10 43#define DEFAULT_PATCH_CACHE_SIZE 100 44 45// Converts a number of mega-bytes into bytes 46#define MB(s) s * 1024 * 1024 47 48// Generates simple and textured vertices 49#define SV(x, y) { { x, y } } 50#define FV(x, y, u, v) { { x, y }, { u, v } } 51 52/////////////////////////////////////////////////////////////////////////////// 53// Globals 54/////////////////////////////////////////////////////////////////////////////// 55 56static const SimpleVertex gDrawColorVertices[] = { 57 SV(0.0f, 0.0f), 58 SV(1.0f, 0.0f), 59 SV(0.0f, 1.0f), 60 SV(1.0f, 1.0f) 61}; 62static const GLsizei gDrawColorVertexStride = sizeof(SimpleVertex); 63static const GLsizei gDrawColorVertexCount = 4; 64 65// This array is never used directly but used as a memcpy source in the 66// OpenGLRenderer constructor 67static const TextureVertex gDrawTextureVertices[] = { 68 FV(0.0f, 0.0f, 0.0f, 0.0f), 69 FV(1.0f, 0.0f, 1.0f, 0.0f), 70 FV(0.0f, 1.0f, 0.0f, 1.0f), 71 FV(1.0f, 1.0f, 1.0f, 1.0f) 72}; 73static const GLsizei gDrawTextureVertexStride = sizeof(TextureVertex); 74static const GLsizei gDrawTextureVertexCount = 4; 75 76// In this array, the index of each Blender equals the value of the first 77// entry. For instance, gBlends[1] == gBlends[SkXfermode::kSrc_Mode] 78static const Blender gBlends[] = { 79 { SkXfermode::kClear_Mode, GL_ZERO, GL_ZERO }, 80 { SkXfermode::kSrc_Mode, GL_ONE, GL_ZERO }, 81 { SkXfermode::kDst_Mode, GL_ZERO, GL_ONE }, 82 { SkXfermode::kSrcOver_Mode, GL_ONE, GL_ONE_MINUS_SRC_ALPHA }, 83 { SkXfermode::kDstOver_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ONE }, 84 { SkXfermode::kSrcIn_Mode, GL_DST_ALPHA, GL_ZERO }, 85 { SkXfermode::kDstIn_Mode, GL_ZERO, GL_SRC_ALPHA }, 86 { SkXfermode::kSrcOut_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ZERO }, 87 { SkXfermode::kDstOut_Mode, GL_ZERO, GL_ONE_MINUS_SRC_ALPHA }, 88 { SkXfermode::kSrcATop_Mode, GL_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA }, 89 { SkXfermode::kDstATop_Mode, GL_ONE_MINUS_DST_ALPHA, GL_SRC_ALPHA }, 90 { SkXfermode::kXor_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA } 91}; 92 93/////////////////////////////////////////////////////////////////////////////// 94// Constructors/destructor 95/////////////////////////////////////////////////////////////////////////////// 96 97OpenGLRenderer::OpenGLRenderer(): 98 mTextureCache(MB(DEFAULT_TEXTURE_CACHE_SIZE)), 99 mLayerCache(MB(DEFAULT_LAYER_CACHE_SIZE)), 100 mPatchCache(DEFAULT_PATCH_CACHE_SIZE) { 101 LOGD("Create OpenGLRenderer"); 102 103 char property[PROPERTY_VALUE_MAX]; 104 if (property_get(PROPERTY_TEXTURE_CACHE_SIZE, property, NULL) > 0) { 105 LOGD(" Setting texture cache size to %sMB", property); 106 mTextureCache.setMaxSize(MB(atoi(property))); 107 } else { 108 LOGD(" Using default texture cache size of %dMB", DEFAULT_TEXTURE_CACHE_SIZE); 109 } 110 111 if (property_get(PROPERTY_LAYER_CACHE_SIZE, property, NULL) > 0) { 112 LOGD(" Setting layer cache size to %sMB", property); 113 mLayerCache.setMaxSize(MB(atoi(property))); 114 } else { 115 LOGD(" Using default layer cache size of %dMB", DEFAULT_LAYER_CACHE_SIZE); 116 } 117 118 mDrawColorShader = new DrawColorProgram; 119 mDrawTextureShader = new DrawTextureProgram; 120 121 memcpy(mDrawTextureVertices, gDrawTextureVertices, sizeof(gDrawTextureVertices)); 122} 123 124OpenGLRenderer::~OpenGLRenderer() { 125 LOGD("Destroy OpenGLRenderer"); 126 127 mTextureCache.clear(); 128 mLayerCache.clear(); 129} 130 131/////////////////////////////////////////////////////////////////////////////// 132// Setup 133/////////////////////////////////////////////////////////////////////////////// 134 135void OpenGLRenderer::setViewport(int width, int height) { 136 glViewport(0, 0, width, height); 137 138 mat4 ortho; 139 ortho.loadOrtho(0, width, height, 0, -1, 1); 140 ortho.copyTo(mOrthoMatrix); 141 142 mWidth = width; 143 mHeight = height; 144 mFirstSnapshot.height = height; 145} 146 147void OpenGLRenderer::prepare() { 148 mSnapshot = &mFirstSnapshot; 149 mSaveCount = 0; 150 151 glDisable(GL_SCISSOR_TEST); 152 153 glClearColor(0.0f, 0.0f, 0.0f, 0.0f); 154 glClear(GL_COLOR_BUFFER_BIT); 155 156 glEnable(GL_SCISSOR_TEST); 157 glScissor(0, 0, mWidth, mHeight); 158 159 mSnapshot->clipRect.set(0.0f, 0.0f, mWidth, mHeight); 160} 161 162/////////////////////////////////////////////////////////////////////////////// 163// State management 164/////////////////////////////////////////////////////////////////////////////// 165 166int OpenGLRenderer::getSaveCount() const { 167 return mSaveCount; 168} 169 170int OpenGLRenderer::save(int flags) { 171 return saveSnapshot(); 172} 173 174void OpenGLRenderer::restore() { 175 if (mSaveCount == 0) return; 176 177 if (restoreSnapshot()) { 178 setScissorFromClip(); 179 } 180} 181 182void OpenGLRenderer::restoreToCount(int saveCount) { 183 if (saveCount <= 0 || saveCount > mSaveCount) return; 184 185 bool restoreClip = false; 186 187 while (mSaveCount != saveCount - 1) { 188 restoreClip |= restoreSnapshot(); 189 } 190 191 if (restoreClip) { 192 setScissorFromClip(); 193 } 194} 195 196int OpenGLRenderer::saveSnapshot() { 197 mSnapshot = new Snapshot(mSnapshot); 198 return ++mSaveCount; 199} 200 201bool OpenGLRenderer::restoreSnapshot() { 202 bool restoreClip = mSnapshot->flags & Snapshot::kFlagClipSet; 203 bool restoreLayer = mSnapshot->flags & Snapshot::kFlagIsLayer; 204 bool restoreOrtho = mSnapshot->flags & Snapshot::kFlagDirtyOrtho; 205 206 sp<Snapshot> current = mSnapshot; 207 sp<Snapshot> previous = mSnapshot->previous; 208 209 if (restoreOrtho) { 210 memcpy(mOrthoMatrix, current->orthoMatrix, sizeof(mOrthoMatrix)); 211 } 212 213 if (restoreLayer) { 214 composeLayer(current, previous); 215 } 216 217 mSnapshot = previous; 218 mSaveCount--; 219 220 return restoreClip; 221} 222 223void OpenGLRenderer::composeLayer(sp<Snapshot> current, sp<Snapshot> previous) { 224 if (!current->layer) { 225 LOGE("Attempting to compose a layer that does not exist"); 226 return; 227 } 228 229 // Unbind current FBO and restore previous one 230 // Most of the time, previous->fbo will be 0 to bind the default buffer 231 glBindFramebuffer(GL_FRAMEBUFFER, previous->fbo); 232 233 // Restore the clip from the previous snapshot 234 const Rect& clip = previous->getMappedClip(); 235 glScissor(clip.left, mHeight - clip.bottom, clip.getWidth(), clip.getHeight()); 236 237 Layer* layer = current->layer; 238 239 // Compute the correct texture coordinates for the FBO texture 240 // The texture is currently as big as the window but drawn with 241 // a quad of the appropriate size 242 const Rect& rect = layer->layer; 243 244 drawTextureRect(rect.left, rect.top, rect.right, rect.bottom, 245 layer->texture, layer->alpha, layer->mode, layer->blend, true); 246 247 LayerSize size(rect.getWidth(), rect.getHeight()); 248 // Failing to add the layer to the cache should happen only if the 249 // layer is too large 250 if (!mLayerCache.put(size, layer)) { 251 LAYER_LOGD("Deleting layer"); 252 253 glDeleteFramebuffers(1, &layer->fbo); 254 glDeleteTextures(1, &layer->texture); 255 256 delete layer; 257 } 258} 259 260/////////////////////////////////////////////////////////////////////////////// 261// Layers 262/////////////////////////////////////////////////////////////////////////////// 263 264int OpenGLRenderer::saveLayer(float left, float top, float right, float bottom, 265 const SkPaint* p, int flags) { 266 int count = saveSnapshot(); 267 268 int alpha = 255; 269 SkXfermode::Mode mode; 270 271 if (p) { 272 alpha = p->getAlpha(); 273 const bool isMode = SkXfermode::IsMode(p->getXfermode(), &mode); 274 if (!isMode) { 275 // Assume SRC_OVER 276 mode = SkXfermode::kSrcOver_Mode; 277 } 278 } else { 279 mode = SkXfermode::kSrcOver_Mode; 280 } 281 282 createLayer(mSnapshot, left, top, right, bottom, alpha, mode, flags); 283 284 return count; 285} 286 287int OpenGLRenderer::saveLayerAlpha(float left, float top, float right, float bottom, 288 int alpha, int flags) { 289 int count = saveSnapshot(); 290 createLayer(mSnapshot, left, top, right, bottom, alpha, SkXfermode::kSrcOver_Mode, flags); 291 return count; 292} 293 294bool OpenGLRenderer::createLayer(sp<Snapshot> snapshot, float left, float top, 295 float right, float bottom, int alpha, SkXfermode::Mode mode,int flags) { 296 297 LAYER_LOGD("Requesting layer %dx%d", size.width, size.height); 298 LAYER_LOGD("Layer cache size = %d", mLayerCache.getSize()); 299 300 GLuint previousFbo = snapshot->previous.get() ? snapshot->previous->fbo : 0; 301 LayerSize size(right - left, bottom - top); 302 303 Layer* layer = mLayerCache.get(size, previousFbo); 304 if (!layer) { 305 return false; 306 } 307 308 glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo); 309 310 // Clear the FBO 311 glDisable(GL_SCISSOR_TEST); 312 glClearColor(0.0f, 0.0f, 0.0f, 0.0f); 313 glClear(GL_COLOR_BUFFER_BIT); 314 glEnable(GL_SCISSOR_TEST); 315 316 // Save the layer in the snapshot 317 snapshot->flags |= Snapshot::kFlagIsLayer; 318 layer->mode = mode; 319 layer->alpha = alpha / 255.0f; 320 layer->layer.set(left, top, right, bottom); 321 322 snapshot->layer = layer; 323 snapshot->fbo = layer->fbo; 324 325 // Creates a new snapshot to draw into the FBO 326 saveSnapshot(); 327 // TODO: This doesn't preserve other transformations (check Skia first) 328 mSnapshot->transform.loadTranslate(-left, -top, 0.0f); 329 mSnapshot->clipRect.set(left, top, right, bottom); 330 mSnapshot->height = bottom - top; 331 setScissorFromClip(); 332 333 mSnapshot->flags = Snapshot::kFlagDirtyTransform | Snapshot::kFlagDirtyOrtho | 334 Snapshot::kFlagClipSet; 335 memcpy(mSnapshot->orthoMatrix, mOrthoMatrix, sizeof(mOrthoMatrix)); 336 337 // Change the ortho projection 338 mat4 ortho; 339 ortho.loadOrtho(0.0f, right - left, bottom - top, 0.0f, 0.0f, 1.0f); 340 ortho.copyTo(mOrthoMatrix); 341 342 return true; 343} 344 345/////////////////////////////////////////////////////////////////////////////// 346// Transforms 347/////////////////////////////////////////////////////////////////////////////// 348 349void OpenGLRenderer::translate(float dx, float dy) { 350 mSnapshot->transform.translate(dx, dy, 0.0f); 351 mSnapshot->flags |= Snapshot::kFlagDirtyTransform; 352} 353 354void OpenGLRenderer::rotate(float degrees) { 355 mSnapshot->transform.rotate(degrees, 0.0f, 0.0f, 1.0f); 356 mSnapshot->flags |= Snapshot::kFlagDirtyTransform; 357} 358 359void OpenGLRenderer::scale(float sx, float sy) { 360 mSnapshot->transform.scale(sx, sy, 1.0f); 361 mSnapshot->flags |= Snapshot::kFlagDirtyTransform; 362} 363 364void OpenGLRenderer::setMatrix(SkMatrix* matrix) { 365 mSnapshot->transform.load(*matrix); 366 mSnapshot->flags |= Snapshot::kFlagDirtyTransform; 367} 368 369void OpenGLRenderer::getMatrix(SkMatrix* matrix) { 370 mSnapshot->transform.copyTo(*matrix); 371} 372 373void OpenGLRenderer::concatMatrix(SkMatrix* matrix) { 374 mat4 m(*matrix); 375 mSnapshot->transform.multiply(m); 376 mSnapshot->flags |= Snapshot::kFlagDirtyTransform; 377} 378 379/////////////////////////////////////////////////////////////////////////////// 380// Clipping 381/////////////////////////////////////////////////////////////////////////////// 382 383void OpenGLRenderer::setScissorFromClip() { 384 const Rect& clip = mSnapshot->getMappedClip(); 385 glScissor(clip.left, mSnapshot->height - clip.bottom, clip.getWidth(), clip.getHeight()); 386} 387 388const Rect& OpenGLRenderer::getClipBounds() { 389 return mSnapshot->clipRect; 390} 391 392bool OpenGLRenderer::quickReject(float left, float top, float right, float bottom) { 393 /* 394 * The documentation of quickReject() indicates that the specified rect 395 * is transformed before being compared to the clip rect. However, the 396 * clip rect is not stored transformed in the snapshot and can thus be 397 * compared directly 398 * 399 * The following code can be used instead to performed a mapped comparison: 400 * 401 * mSnapshot->transform.mapRect(r); 402 * const Rect& clip = mSnapshot->getMappedClip(); 403 * return !clip.intersects(r); 404 */ 405 Rect r(left, top, right, bottom); 406 return !mSnapshot->clipRect.intersects(r); 407} 408 409bool OpenGLRenderer::clipRect(float left, float top, float right, float bottom) { 410 bool clipped = mSnapshot->clipRect.intersect(left, top, right, bottom); 411 if (clipped) { 412 mSnapshot->flags |= Snapshot::kFlagClipSet; 413 setScissorFromClip(); 414 } 415 return clipped; 416} 417 418/////////////////////////////////////////////////////////////////////////////// 419// Drawing 420/////////////////////////////////////////////////////////////////////////////// 421 422void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, float left, float top, const SkPaint* paint) { 423 const Texture* texture = mTextureCache.get(bitmap); 424 425 int alpha; 426 SkXfermode::Mode mode; 427 getAlphaAndMode(paint, &alpha, &mode); 428 429 drawTextureRect(left, top, left + texture->width, top + texture->height, texture->id, 430 alpha / 255.0f, mode, texture->blend, true); 431} 432 433void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, const SkMatrix* matrix, const SkPaint* paint) { 434 Rect r(0.0f, 0.0f, bitmap->width(), bitmap->height()); 435 const mat4 transform(*matrix); 436 transform.mapRect(r); 437 438 const Texture* texture = mTextureCache.get(bitmap); 439 440 int alpha; 441 SkXfermode::Mode mode; 442 getAlphaAndMode(paint, &alpha, &mode); 443 444 drawTextureRect(r.left, r.top, r.right, r.bottom, texture->id, 445 alpha / 255.0f, mode, texture->blend, true); 446} 447 448void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, 449 float srcLeft, float srcTop, float srcRight, float srcBottom, 450 float dstLeft, float dstTop, float dstRight, float dstBottom, 451 const SkPaint* paint) { 452 const Texture* texture = mTextureCache.get(bitmap); 453 454 int alpha; 455 SkXfermode::Mode mode; 456 getAlphaAndMode(paint, &alpha, &mode); 457 458 const float width = texture->width; 459 const float height = texture->height; 460 461 const float u1 = srcLeft / width; 462 const float v1 = srcTop / height; 463 const float u2 = srcRight / width; 464 const float v2 = srcBottom / height; 465 466 resetDrawTextureTexCoords(u1, v1, u2, v2); 467 468 drawTextureRect(dstLeft, dstTop, dstRight, dstBottom, texture->id, 469 alpha / 255.0f, mode, texture->blend, true); 470 471 resetDrawTextureTexCoords(0.0f, 0.0f, 1.0f, 1.0f); 472} 473 474void OpenGLRenderer::drawPatch(SkBitmap* bitmap, Res_png_9patch* patch, 475 float left, float top, float right, float bottom, const SkPaint* paint) { 476 const Texture* texture = mTextureCache.get(bitmap); 477 478 int alpha; 479 SkXfermode::Mode mode; 480 getAlphaAndMode(paint, &alpha, &mode); 481 482 const uint32_t width = patch->numXDivs; 483 const uint32_t height = patch->numYDivs; 484 485 Patch* mesh = mPatchCache.get(patch); 486 487 const uint32_t xStretchCount = (width + 1) >> 1; 488 const uint32_t yStretchCount = (height + 1) >> 1; 489 490 const int32_t* xDivs = &patch->xDivs[0]; 491 const int32_t* yDivs = &patch->yDivs[0]; 492 493 float xStretch = 0; 494 float yStretch = 0; 495 float xStretchTex = 0; 496 float yStretchTex = 0; 497 498 const float meshWidth = right - left; 499 500 const float bitmapWidth = float(bitmap->width()); 501 const float bitmapHeight = float(bitmap->height()); 502 503 if (xStretchCount > 0) { 504 uint32_t stretchSize = 0; 505 for (uint32_t i = 1; i < width; i += 2) { 506 stretchSize += xDivs[i] - xDivs[i - 1]; 507 } 508 xStretchTex = (stretchSize / bitmapWidth) / xStretchCount; 509 const float fixed = bitmapWidth - stretchSize; 510 xStretch = (right - left - fixed) / xStretchCount; 511 } 512 513 if (yStretchCount > 0) { 514 uint32_t stretchSize = 0; 515 for (uint32_t i = 1; i < height; i += 2) { 516 stretchSize += yDivs[i] - yDivs[i - 1]; 517 } 518 yStretchTex = (stretchSize / bitmapHeight) / yStretchCount; 519 const float fixed = bitmapHeight - stretchSize; 520 yStretch = (bottom - top - fixed) / yStretchCount; 521 } 522 523 float vy = 0.0f; 524 float ty = 0.0f; 525 TextureVertex* vertex = mesh->vertices; 526 527 generateVertices(vertex, 0.0f, 0.0f, xDivs, width, xStretch, xStretchTex, 528 meshWidth, bitmapWidth); 529 vertex += width + 2; 530 531 for (uint32_t y = 0; y < height; y++) { 532 if (y & 1) { 533 vy += yStretch; 534 ty += yStretchTex; 535 } else { 536 const float step = float(yDivs[y]); 537 vy += step; 538 ty += step / bitmapHeight; 539 } 540 generateVertices(vertex, vy, ty, xDivs, width, xStretch, xStretchTex, 541 meshWidth, bitmapWidth); 542 vertex += width + 2; 543 } 544 545 generateVertices(vertex, bottom - top, 1.0f, xDivs, width, xStretch, xStretchTex, 546 meshWidth, bitmapWidth); 547 548 // Specify right and bottom as +1.0f from left/top to prevent scaling since the 549 // patch mesh already defines the final size 550 drawTextureMesh(left, top, left + 1.0f, top + 1.0f, texture->id, alpha, mode, texture->blend, 551 true, &mesh->vertices[0].position[0], &mesh->vertices[0].texture[0], mesh->indices, 552 mesh->indicesCount); 553} 554 555void OpenGLRenderer::generateVertices(TextureVertex* vertex, float y, float v, 556 const int32_t xDivs[], uint32_t xCount, float xStretch, float xStretchTex, 557 float width, float widthTex) { 558 float vx = 0.0f; 559 float tx = 0.0f; 560 561 TextureVertex::set(vertex, vx, y, tx, v); 562 vertex++; 563 564 for (uint32_t x = 0; x < xCount; x++) { 565 if (x & 1) { 566 vx += xStretch; 567 tx += xStretchTex; 568 } else { 569 const float step = float(xDivs[x]); 570 vx += step; 571 tx += step / widthTex; 572 } 573 574 TextureVertex::set(vertex, vx, y, tx, v); 575 vertex++; 576 } 577 578 TextureVertex::set(vertex, width, y, 1.0f, v); 579 vertex++; 580} 581 582void OpenGLRenderer::drawColor(int color, SkXfermode::Mode mode) { 583 const Rect& clip = mSnapshot->clipRect; 584 drawColorRect(clip.left, clip.top, clip.right, clip.bottom, color, mode); 585} 586 587void OpenGLRenderer::drawRect(float left, float top, float right, float bottom, const SkPaint* p) { 588 SkXfermode::Mode mode; 589 590 const bool isMode = SkXfermode::IsMode(p->getXfermode(), &mode); 591 if (!isMode) { 592 // Assume SRC_OVER 593 mode = SkXfermode::kSrcOver_Mode; 594 } 595 596 // Skia draws using the color's alpha channel if < 255 597 // Otherwise, it uses the paint's alpha 598 int color = p->getColor(); 599 if (((color >> 24) & 0xFF) == 255) { 600 color |= p->getAlpha() << 24; 601 } 602 603 drawColorRect(left, top, right, bottom, color, mode); 604} 605 606void OpenGLRenderer::drawColorRect(float left, float top, float right, float bottom, 607 int color, SkXfermode::Mode mode) { 608 const int alpha = (color >> 24) & 0xFF; 609 const bool blend = alpha < 255 || mode != SkXfermode::kSrcOver_Mode; 610 611 const GLfloat a = alpha / 255.0f; 612 const GLfloat r = ((color >> 16) & 0xFF) / 255.0f; 613 const GLfloat g = ((color >> 8) & 0xFF) / 255.0f; 614 const GLfloat b = ((color ) & 0xFF) / 255.0f; 615 616 if (blend) { 617 glEnable(GL_BLEND); 618 glBlendFunc(gBlends[mode].src, gBlends[mode].dst); 619 } 620 621 mModelView.loadTranslate(left, top, 0.0f); 622 mModelView.scale(right - left, bottom - top, 1.0f); 623 624 mDrawColorShader->use(&mOrthoMatrix[0], &mModelView.data[0], &mSnapshot->transform.data[0]); 625 626 const GLvoid* p = &gDrawColorVertices[0].position[0]; 627 628 glEnableVertexAttribArray(mDrawColorShader->position); 629 glVertexAttribPointer(mDrawColorShader->position, 2, GL_FLOAT, GL_FALSE, 630 gDrawColorVertexStride, p); 631 glVertexAttrib4f(mDrawColorShader->color, r, g, b, a); 632 633 glDrawArrays(GL_TRIANGLE_STRIP, 0, gDrawColorVertexCount); 634 635 glDisableVertexAttribArray(mDrawColorShader->position); 636 637 if (blend) { 638 glDisable(GL_BLEND); 639 } 640} 641 642void OpenGLRenderer::drawTextureRect(float left, float top, float right, float bottom, 643 GLuint texture, float alpha, SkXfermode::Mode mode, bool blend, bool isPremultiplied) { 644 drawTextureMesh(left, top, right, bottom, texture, alpha, mode, blend, isPremultiplied, 645 &mDrawTextureVertices[0].position[0], &mDrawTextureVertices[0].texture[0], NULL); 646} 647 648void OpenGLRenderer::drawTextureMesh(float left, float top, float right, float bottom, 649 GLuint texture, float alpha, SkXfermode::Mode mode, bool blend, bool isPremultiplied, 650 GLvoid* vertices, GLvoid* texCoords, GLvoid* indices, GLsizei elementsCount) { 651 mModelView.loadTranslate(left, top, 0.0f); 652 mModelView.scale(right - left, bottom - top, 1.0f); 653 654 mDrawTextureShader->use(&mOrthoMatrix[0], &mModelView.data[0], &mSnapshot->transform.data[0]); 655 656 if (blend || alpha < 1.0f || mode != SkXfermode::kSrcOver_Mode) { 657 GLenum sourceMode = gBlends[mode].src; 658 if (!isPremultiplied && sourceMode == GL_ONE) { 659 sourceMode = GL_SRC_ALPHA; 660 } 661 662 glEnable(GL_BLEND); 663 glBlendFunc(sourceMode, gBlends[mode].dst); 664 } 665 666 glBindTexture(GL_TEXTURE_2D, texture); 667 668 // TODO handle tiling and filtering here 669 670 glActiveTexture(GL_TEXTURE0); 671 glUniform1i(mDrawTextureShader->sampler, 0); 672 673 glEnableVertexAttribArray(mDrawTextureShader->position); 674 glVertexAttribPointer(mDrawTextureShader->position, 2, GL_FLOAT, GL_FALSE, 675 gDrawTextureVertexStride, vertices); 676 677 glEnableVertexAttribArray(mDrawTextureShader->texCoords); 678 glVertexAttribPointer(mDrawTextureShader->texCoords, 2, GL_FLOAT, GL_FALSE, 679 gDrawTextureVertexStride, texCoords); 680 681 glVertexAttrib4f(mDrawTextureShader->color, 1.0f, 1.0f, 1.0f, alpha); 682 683 if (!indices) { 684 glDrawArrays(GL_TRIANGLE_STRIP, 0, gDrawTextureVertexCount); 685 } else { 686 glDrawElements(GL_TRIANGLES, elementsCount, GL_UNSIGNED_SHORT, indices); 687 } 688 689 glDisableVertexAttribArray(mDrawTextureShader->position); 690 glDisableVertexAttribArray(mDrawTextureShader->texCoords); 691 692 glBindTexture(GL_TEXTURE_2D, 0); 693 glDisable(GL_BLEND); 694} 695 696void OpenGLRenderer::resetDrawTextureTexCoords(float u1, float v1, float u2, float v2) { 697 mDrawTextureVertices[0].texture[0] = u1; 698 mDrawTextureVertices[0].texture[1] = v1; 699 mDrawTextureVertices[1].texture[0] = u2; 700 mDrawTextureVertices[1].texture[1] = v1; 701 mDrawTextureVertices[2].texture[0] = u1; 702 mDrawTextureVertices[2].texture[1] = v2; 703 mDrawTextureVertices[3].texture[0] = u2; 704 mDrawTextureVertices[3].texture[1] = v2; 705} 706 707void OpenGLRenderer::getAlphaAndMode(const SkPaint* paint, int* alpha, SkXfermode::Mode* mode) { 708 if (paint) { 709 const bool isMode = SkXfermode::IsMode(paint->getXfermode(), mode); 710 if (!isMode) { 711 // Assume SRC_OVER 712 *mode = SkXfermode::kSrcOver_Mode; 713 } 714 715 // Skia draws using the color's alpha channel if < 255 716 // Otherwise, it uses the paint's alpha 717 int color = paint->getColor(); 718 *alpha = (color >> 24) & 0xFF; 719 if (*alpha == 255) { 720 *alpha = paint->getAlpha(); 721 } 722 } else { 723 *mode = SkXfermode::kSrcOver_Mode; 724 *alpha = 255; 725 } 726} 727 728}; // namespace uirenderer 729}; // namespace android 730