OpenGLRenderer.h revision 7273daace9303f4662444111c40bb83d3ead4a92
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#ifndef ANDROID_HWUI_OPENGL_RENDERER_H 18#define ANDROID_HWUI_OPENGL_RENDERER_H 19 20#include <GLES2/gl2.h> 21#include <GLES2/gl2ext.h> 22 23#include <SkBitmap.h> 24#include <SkMatrix.h> 25#include <SkPaint.h> 26#include <SkRegion.h> 27#include <SkShader.h> 28#include <SkXfermode.h> 29 30#include <utils/Functor.h> 31#include <utils/RefBase.h> 32#include <utils/SortedVector.h> 33#include <utils/Vector.h> 34 35#include <cutils/compiler.h> 36 37#include "Debug.h" 38#include "Extensions.h" 39#include "Matrix.h" 40#include "Program.h" 41#include "Rect.h" 42#include "Snapshot.h" 43#include "Vertex.h" 44#include "SkiaShader.h" 45#include "SkiaColorFilter.h" 46#include "Caches.h" 47 48namespace android { 49namespace uirenderer { 50 51struct DrawModifiers { 52 SkiaShader* mShader; 53 SkiaColorFilter* mColorFilter; 54 55 // Drop shadow 56 bool mHasShadow; 57 float mShadowRadius; 58 float mShadowDx; 59 float mShadowDy; 60 int mShadowColor; 61 62 // Draw filters 63 bool mHasDrawFilter; 64 int mPaintFilterClearBits; 65 int mPaintFilterSetBits; 66}; 67 68enum StateDeferFlags { 69 kStateDeferFlag_Draw = 0x1, 70 kStateDeferFlag_Clip = 0x2 71}; 72 73struct DeferredDisplayState { 74 Rect mBounds; // local bounds, mapped with matrix to be in screen space coordinates, clipped. 75 76 // the below are set and used by the OpenGLRenderer at record and deferred playback 77 Rect mClip; 78 mat4 mMatrix; 79 DrawModifiers mDrawModifiers; 80 float mAlpha; 81}; 82 83/////////////////////////////////////////////////////////////////////////////// 84// Renderer 85/////////////////////////////////////////////////////////////////////////////// 86 87class DisplayList; 88class TextSetupFunctor; 89class VertexBuffer; 90 91/** 92 * OpenGL renderer used to draw accelerated 2D graphics. The API is a 93 * simplified version of Skia's Canvas API. 94 */ 95class OpenGLRenderer { 96public: 97 ANDROID_API OpenGLRenderer(); 98 virtual ~OpenGLRenderer(); 99 100 /** 101 * Sets the name of this renderer. The name is optional and 102 * empty by default. If the pointer is null the name is set 103 * to the empty string. 104 */ 105 ANDROID_API void setName(const char* name); 106 107 /** 108 * Returns the name of this renderer as UTF8 string. 109 * The returned pointer is never null. 110 */ 111 ANDROID_API const char* getName() const; 112 113 /** 114 * Read externally defined properties to control the behavior 115 * of the renderer. 116 */ 117 ANDROID_API void initProperties(); 118 119 /** 120 * Indicates whether this renderer executes drawing commands immediately. 121 * If this method returns true, the drawing commands will be executed 122 * later. 123 */ 124 virtual bool isDeferred(); 125 126 /** 127 * Sets the dimension of the underlying drawing surface. This method must 128 * be called at least once every time the drawing surface changes size. 129 * 130 * @param width The width in pixels of the underlysing surface 131 * @param height The height in pixels of the underlysing surface 132 */ 133 virtual void setViewport(int width, int height); 134 135 /** 136 * Prepares the renderer to draw a frame. This method must be invoked 137 * at the beginning of each frame. When this method is invoked, the 138 * entire drawing surface is assumed to be redrawn. 139 * 140 * @param opaque If true, the target surface is considered opaque 141 * and will not be cleared. If false, the target surface 142 * will be cleared 143 */ 144 ANDROID_API status_t prepare(bool opaque); 145 146 /** 147 * Prepares the renderer to draw a frame. This method must be invoked 148 * at the beginning of each frame. Only the specified rectangle of the 149 * frame is assumed to be dirty. A clip will automatically be set to 150 * the specified rectangle. 151 * 152 * @param left The left coordinate of the dirty rectangle 153 * @param top The top coordinate of the dirty rectangle 154 * @param right The right coordinate of the dirty rectangle 155 * @param bottom The bottom coordinate of the dirty rectangle 156 * @param opaque If true, the target surface is considered opaque 157 * and will not be cleared. If false, the target surface 158 * will be cleared in the specified dirty rectangle 159 */ 160 virtual status_t prepareDirty(float left, float top, float right, float bottom, bool opaque); 161 162 /** 163 * Indicates the end of a frame. This method must be invoked whenever 164 * the caller is done rendering a frame. 165 */ 166 virtual void finish(); 167 168 /** 169 * This method must be invoked before handing control over to a draw functor. 170 * See callDrawGLFunction() for instance. 171 * 172 * This command must not be recorded inside display lists. 173 */ 174 virtual void interrupt(); 175 176 /** 177 * This method must be invoked after getting control back from a draw functor. 178 * 179 * This command must not be recorded inside display lists. 180 */ 181 virtual void resume(); 182 183 ANDROID_API status_t invokeFunctors(Rect& dirty); 184 ANDROID_API void detachFunctor(Functor* functor); 185 ANDROID_API void attachFunctor(Functor* functor); 186 virtual status_t callDrawGLFunction(Functor* functor, Rect& dirty); 187 188 ANDROID_API void pushLayerUpdate(Layer* layer); 189 ANDROID_API void clearLayerUpdates(); 190 191 ANDROID_API int getSaveCount() const; 192 virtual int save(int flags); 193 virtual void restore(); 194 virtual void restoreToCount(int saveCount); 195 196 ANDROID_API int saveLayer(float left, float top, float right, float bottom, 197 SkPaint* paint, int flags) { 198 SkXfermode::Mode mode = SkXfermode::kSrcOver_Mode; 199 if (paint) mode = getXfermode(paint->getXfermode()); 200 return saveLayer(left, top, right, bottom, paint ? paint->getAlpha() : 255, mode, flags); 201 } 202 ANDROID_API int saveLayerAlpha(float left, float top, float right, float bottom, 203 int alpha, int flags) { 204 return saveLayer(left, top, right, bottom, alpha, SkXfermode::kSrcOver_Mode, flags); 205 } 206 virtual int saveLayer(float left, float top, float right, float bottom, 207 int alpha, SkXfermode::Mode mode, int flags); 208 209 int saveLayerDeferred(float left, float top, float right, float bottom, 210 int alpha, SkXfermode::Mode mode, int flags); 211 212 virtual void translate(float dx, float dy); 213 virtual void rotate(float degrees); 214 virtual void scale(float sx, float sy); 215 virtual void skew(float sx, float sy); 216 217 bool hasRectToRectTransform(); 218 ANDROID_API void getMatrix(SkMatrix* matrix); 219 virtual void setMatrix(SkMatrix* matrix); 220 virtual void concatMatrix(SkMatrix* matrix); 221 222 ANDROID_API const Rect& getClipBounds(); 223 ANDROID_API bool quickReject(float left, float top, float right, float bottom); 224 bool quickRejectNoScissor(float left, float top, float right, float bottom); 225 virtual bool clipRect(float left, float top, float right, float bottom, SkRegion::Op op); 226 virtual bool clipPath(SkPath* path, SkRegion::Op op); 227 virtual bool clipRegion(SkRegion* region, SkRegion::Op op); 228 virtual Rect* getClipRect(); 229 230 virtual status_t drawDisplayList(DisplayList* displayList, Rect& dirty, int32_t replayFlags); 231 virtual void outputDisplayList(DisplayList* displayList); 232 virtual status_t drawLayer(Layer* layer, float x, float y); 233 virtual status_t drawBitmap(SkBitmap* bitmap, float left, float top, SkPaint* paint); 234 virtual status_t drawBitmap(SkBitmap* bitmap, SkMatrix* matrix, SkPaint* paint); 235 virtual status_t drawBitmap(SkBitmap* bitmap, float srcLeft, float srcTop, 236 float srcRight, float srcBottom, float dstLeft, float dstTop, 237 float dstRight, float dstBottom, SkPaint* paint); 238 virtual status_t drawBitmapData(SkBitmap* bitmap, float left, float top, SkPaint* paint); 239 virtual status_t drawBitmapMesh(SkBitmap* bitmap, int meshWidth, int meshHeight, 240 float* vertices, int* colors, SkPaint* paint); 241 virtual status_t drawPatch(SkBitmap* bitmap, const int32_t* xDivs, const int32_t* yDivs, 242 const uint32_t* colors, uint32_t width, uint32_t height, int8_t numColors, 243 float left, float top, float right, float bottom, SkPaint* paint); 244 status_t drawPatch(SkBitmap* bitmap, const int32_t* xDivs, const int32_t* yDivs, 245 const uint32_t* colors, uint32_t width, uint32_t height, int8_t numColors, 246 float left, float top, float right, float bottom, int alpha, SkXfermode::Mode mode); 247 virtual status_t drawColor(int color, SkXfermode::Mode mode); 248 virtual status_t drawRect(float left, float top, float right, float bottom, SkPaint* paint); 249 virtual status_t drawRoundRect(float left, float top, float right, float bottom, 250 float rx, float ry, SkPaint* paint); 251 virtual status_t drawCircle(float x, float y, float radius, SkPaint* paint); 252 virtual status_t drawOval(float left, float top, float right, float bottom, SkPaint* paint); 253 virtual status_t drawArc(float left, float top, float right, float bottom, 254 float startAngle, float sweepAngle, bool useCenter, SkPaint* paint); 255 virtual status_t drawPath(SkPath* path, SkPaint* paint); 256 virtual status_t drawLines(float* points, int count, SkPaint* paint); 257 virtual status_t drawPoints(float* points, int count, SkPaint* paint); 258 virtual status_t drawTextOnPath(const char* text, int bytesCount, int count, SkPath* path, 259 float hOffset, float vOffset, SkPaint* paint); 260 virtual status_t drawPosText(const char* text, int bytesCount, int count, 261 const float* positions, SkPaint* paint); 262 virtual status_t drawText(const char* text, int bytesCount, int count, float x, float y, 263 const float* positions, SkPaint* paint, float length = -1.0f); 264 virtual status_t drawRects(const float* rects, int count, SkPaint* paint); 265 266 virtual void resetShader(); 267 virtual void setupShader(SkiaShader* shader); 268 269 virtual void resetColorFilter(); 270 virtual void setupColorFilter(SkiaColorFilter* filter); 271 272 virtual void resetShadow(); 273 virtual void setupShadow(float radius, float dx, float dy, int color); 274 275 virtual void resetPaintFilter(); 276 virtual void setupPaintFilter(int clearBits, int setBits); 277 278 SkPaint* filterPaint(SkPaint* paint); 279 280 bool storeDisplayState(DeferredDisplayState& state, int stateDeferFlags); 281 void restoreDisplayState(const DeferredDisplayState& state); 282 283 const DrawModifiers& getDrawModifiers() { return mDrawModifiers; } 284 void setDrawModifiers(const DrawModifiers& drawModifiers) { mDrawModifiers = drawModifiers; } 285 286 // TODO: what does this mean? no perspective? no rotate? 287 ANDROID_API bool isCurrentTransformSimple() { 288 return mSnapshot->transform->isSimple(); 289 } 290 291 Caches& getCaches() { 292 return mCaches; 293 } 294 295 // simple rect clip 296 bool isCurrentClipSimple() { 297 return mSnapshot->clipRegion->isEmpty(); 298 } 299 300 /** 301 * Scales the alpha on the current snapshot. This alpha value will be modulated 302 * with other alpha values when drawing primitives. 303 */ 304 void scaleAlpha(float alpha) { 305 mSnapshot->alpha *= alpha; 306 } 307 308 /** 309 * Inserts a named event marker in the stream of GL commands. 310 */ 311 void eventMark(const char* name) const; 312 313 /** 314 * Inserts a named group marker in the stream of GL commands. This marker 315 * can be used by tools to group commands into logical groups. A call to 316 * this method must always be followed later on by a call to endMark(). 317 */ 318 void startMark(const char* name) const; 319 320 /** 321 * Closes the last group marker opened by startMark(). 322 */ 323 void endMark() const; 324 325 /** 326 * Gets the alpha and xfermode out of a paint object. If the paint is null 327 * alpha will be 255 and the xfermode will be SRC_OVER. This method does 328 * not multiply the paint's alpha by the current snapshot's alpha. 329 * 330 * @param paint The paint to extract values from 331 * @param alpha Where to store the resulting alpha 332 * @param mode Where to store the resulting xfermode 333 */ 334 static inline void getAlphaAndModeDirect(SkPaint* paint, int* alpha, SkXfermode::Mode* mode) { 335 if (paint) { 336 *mode = getXfermode(paint->getXfermode()); 337 338 // Skia draws using the color's alpha channel if < 255 339 // Otherwise, it uses the paint's alpha 340 int color = paint->getColor(); 341 *alpha = (color >> 24) & 0xFF; 342 if (*alpha == 255) { 343 *alpha = paint->getAlpha(); 344 } 345 } else { 346 *mode = SkXfermode::kSrcOver_Mode; 347 *alpha = 255; 348 } 349 } 350 351 /** 352 * Return the best transform to use to rasterize text given a full 353 * transform matrix. 354 */ 355 mat4 findBestFontTransform(const mat4& transform) const; 356 357protected: 358 /** 359 * Computes the projection matrix, initialize the first snapshot 360 * and stores the dimensions of the render target. 361 */ 362 void initViewport(int width, int height); 363 364 /** 365 * Perform the setup specific to a frame. This method does not 366 * issue any OpenGL commands. 367 */ 368 void setupFrameState(float left, float top, float right, float bottom, bool opaque); 369 370 /** 371 * Indicates the start of rendering. This method will setup the 372 * initial OpenGL state (viewport, clearing the buffer, etc.) 373 */ 374 status_t startFrame(); 375 376 /** 377 * Clears the underlying surface if needed. 378 */ 379 virtual status_t clear(float left, float top, float right, float bottom, bool opaque); 380 381 /** 382 * Call this method after updating a layer during a drawing pass. 383 */ 384 void resumeAfterLayer(); 385 386 /** 387 * This method is called whenever a stencil buffer is required. Subclasses 388 * should override this method and call attachStencilBufferToLayer() on the 389 * appropriate layer(s). 390 */ 391 virtual void ensureStencilBuffer(); 392 393 /** 394 * Obtains a stencil render buffer (allocating it if necessary) and 395 * attaches it to the specified layer. 396 */ 397 void attachStencilBufferToLayer(Layer* layer); 398 399 /** 400 * Compose the layer defined in the current snapshot with the layer 401 * defined by the previous snapshot. 402 * 403 * The current snapshot *must* be a layer (flag kFlagIsLayer set.) 404 * 405 * @param curent The current snapshot containing the layer to compose 406 * @param previous The previous snapshot to compose the current layer with 407 */ 408 virtual void composeLayer(sp<Snapshot> current, sp<Snapshot> previous); 409 410 /** 411 * Marks the specified region as dirty at the specified bounds. 412 */ 413 void dirtyLayerUnchecked(Rect& bounds, Region* region); 414 415 /** 416 * Returns the current snapshot. 417 */ 418 sp<Snapshot> getSnapshot() const { 419 return mSnapshot; 420 } 421 422 /** 423 * Returns the region of the current layer. 424 */ 425 virtual Region* getRegion() const { 426 return mSnapshot->region; 427 } 428 429 /** 430 * Indicates whether rendering is currently targeted at a layer. 431 */ 432 virtual bool hasLayer() const { 433 return (mSnapshot->flags & Snapshot::kFlagFboTarget) && mSnapshot->region; 434 } 435 436 /** 437 * Returns the name of the FBO this renderer is rendering into. 438 */ 439 virtual GLint getTargetFbo() const { 440 return 0; 441 } 442 443 /** 444 * Renders the specified layer as a textured quad. 445 * 446 * @param layer The layer to render 447 * @param rect The bounds of the layer 448 */ 449 void drawTextureLayer(Layer* layer, const Rect& rect); 450 451 /** 452 * Gets the alpha and xfermode out of a paint object. If the paint is null 453 * alpha will be 255 and the xfermode will be SRC_OVER. 454 * 455 * @param paint The paint to extract values from 456 * @param alpha Where to store the resulting alpha 457 * @param mode Where to store the resulting xfermode 458 */ 459 inline void getAlphaAndMode(SkPaint* paint, int* alpha, SkXfermode::Mode* mode); 460 461 /** 462 * Safely retrieves the mode from the specified xfermode. If the specified 463 * xfermode is null, the mode is assumed to be SkXfermode::kSrcOver_Mode. 464 */ 465 static inline SkXfermode::Mode getXfermode(SkXfermode* mode) { 466 SkXfermode::Mode resultMode; 467 if (!SkXfermode::AsMode(mode, &resultMode)) { 468 resultMode = SkXfermode::kSrcOver_Mode; 469 } 470 return resultMode; 471 } 472 473 /** 474 * Set to true to suppress error checks at the end of a frame. 475 */ 476 virtual bool suppressErrorChecks() const { 477 return false; 478 } 479 480private: 481 /** 482 * Discards the content of the framebuffer if supported by the driver. 483 * This method should be called at the beginning of a frame to optimize 484 * rendering on some tiler architectures. 485 */ 486 void discardFramebuffer(float left, float top, float right, float bottom); 487 488 /** 489 * Ensures the state of the renderer is the same as the state of 490 * the GL context. 491 */ 492 void syncState(); 493 494 /** 495 * Tells the GPU what part of the screen is about to be redrawn. 496 * This method will use the clip rect that we started drawing the 497 * frame with. 498 * This method needs to be invoked every time getTargetFbo() is 499 * bound again. 500 */ 501 void startTiling(const sp<Snapshot>& snapshot, bool opaque = false); 502 503 /** 504 * Tells the GPU what part of the screen is about to be redrawn. 505 * This method needs to be invoked every time getTargetFbo() is 506 * bound again. 507 */ 508 void startTiling(const Rect& clip, int windowHeight, bool opaque = false); 509 510 /** 511 * Tells the GPU that we are done drawing the frame or that we 512 * are switching to another render target. 513 */ 514 void endTiling(); 515 516 /** 517 * Saves the current state of the renderer as a new snapshot. 518 * The new snapshot is saved in mSnapshot and the previous snapshot 519 * is linked from mSnapshot->previous. 520 * 521 * @param flags The save flags; see SkCanvas for more information 522 * 523 * @return The new save count. This value can be passed to #restoreToCount() 524 */ 525 int saveSnapshot(int flags); 526 527 /** 528 * Restores the current snapshot; mSnapshot becomes mSnapshot->previous. 529 * 530 * @return True if the clip was modified. 531 */ 532 bool restoreSnapshot(); 533 534 /** 535 * Sets the clipping rectangle using glScissor. The clip is defined by 536 * the current snapshot's clipRect member. 537 */ 538 void setScissorFromClip(); 539 540 /** 541 * Sets the clipping region using the stencil buffer. The clip region 542 * is defined by the current snapshot's clipRegion member. 543 */ 544 void setStencilFromClip(); 545 546 /** 547 * Performs a quick reject but does not affect the scissor. Returns 548 * the transformed rect to test and the current clip. 549 */ 550 bool quickRejectNoScissor(float left, float top, float right, float bottom, 551 Rect& transformed, Rect& clip); 552 553 /** 554 * Performs a quick reject but adjust the bounds to account for stroke width if necessary 555 */ 556 bool quickRejectPreStroke(float left, float top, float right, float bottom, SkPaint* paint); 557 558 /** 559 * Given the local bounds of the layer, calculates ... 560 */ 561 void calculateLayerBoundsAndClip(Rect& bounds, Rect& clip, bool fboLayer); 562 563 /** 564 * Given the local bounds + clip of the layer, updates current snapshot's empty/invisible 565 */ 566 void updateSnapshotIgnoreForLayer(const Rect& bounds, const Rect& clip, 567 bool fboLayer, int alpha); 568 569 /** 570 * Creates a new layer stored in the specified snapshot. 571 * 572 * @param snapshot The snapshot associated with the new layer 573 * @param left The left coordinate of the layer 574 * @param top The top coordinate of the layer 575 * @param right The right coordinate of the layer 576 * @param bottom The bottom coordinate of the layer 577 * @param alpha The translucency of the layer 578 * @param mode The blending mode of the layer 579 * @param flags The layer save flags 580 * @param previousFbo The name of the current framebuffer 581 * 582 * @return True if the layer was successfully created, false otherwise 583 */ 584 bool createLayer(float left, float top, float right, float bottom, 585 int alpha, SkXfermode::Mode mode, int flags, GLuint previousFbo); 586 587 /** 588 * Creates a new layer stored in the specified snapshot as an FBO. 589 * 590 * @param layer The layer to store as an FBO 591 * @param snapshot The snapshot associated with the new layer 592 * @param bounds The bounds of the layer 593 * @param previousFbo The name of the current framebuffer 594 */ 595 bool createFboLayer(Layer* layer, Rect& bounds, Rect& clip, GLuint previousFbo); 596 597 /** 598 * Compose the specified layer as a region. 599 * 600 * @param layer The layer to compose 601 * @param rect The layer's bounds 602 */ 603 void composeLayerRegion(Layer* layer, const Rect& rect); 604 605 /** 606 * Compose the specified layer as a simple rectangle. 607 * 608 * @param layer The layer to compose 609 * @param rect The layer's bounds 610 * @param swap If true, the source and destination are swapped 611 */ 612 void composeLayerRect(Layer* layer, const Rect& rect, bool swap = false); 613 614 /** 615 * Clears all the regions corresponding to the current list of layers. 616 * This method MUST be invoked before any drawing operation. 617 */ 618 void clearLayerRegions(); 619 620 /** 621 * Mark the layer as dirty at the specified coordinates. The coordinates 622 * are transformed with the supplied matrix. 623 */ 624 void dirtyLayer(const float left, const float top, 625 const float right, const float bottom, const mat4 transform); 626 627 /** 628 * Mark the layer as dirty at the specified coordinates. 629 */ 630 void dirtyLayer(const float left, const float top, 631 const float right, const float bottom); 632 633 /** 634 * Draws a colored rectangle with the specified color. The specified coordinates 635 * are transformed by the current snapshot's transform matrix unless specified 636 * otherwise. 637 * 638 * @param left The left coordinate of the rectangle 639 * @param top The top coordinate of the rectangle 640 * @param right The right coordinate of the rectangle 641 * @param bottom The bottom coordinate of the rectangle 642 * @param color The rectangle's ARGB color, defined as a packed 32 bits word 643 * @param mode The Skia xfermode to use 644 * @param ignoreTransform True if the current transform should be ignored 645 */ 646 void drawColorRect(float left, float top, float right, float bottom, 647 int color, SkXfermode::Mode mode, bool ignoreTransform = false); 648 649 /** 650 * Draws a series of colored rectangles with the specified color. The specified 651 * coordinates are transformed by the current snapshot's transform matrix unless 652 * specified otherwise. 653 * 654 * @param rects A list of rectangles, 4 floats (left, top, right, bottom) 655 * per rectangle 656 * @param color The rectangles' ARGB color, defined as a packed 32 bits word 657 * @param mode The Skia xfermode to use 658 * @param ignoreTransform True if the current transform should be ignored 659 * @param dirty True if calling this method should dirty the current layer 660 * @param clip True if the rects should be clipped, false otherwise 661 */ 662 status_t drawColorRects(const float* rects, int count, int color, 663 SkXfermode::Mode mode, bool ignoreTransform = false, 664 bool dirty = true, bool clip = true); 665 666 /** 667 * Draws the shape represented by the specified path texture. 668 * This method invokes drawPathTexture() but takes into account 669 * the extra left/top offset and the texture offset to correctly 670 * position the final shape. 671 * 672 * @param left The left coordinate of the shape to render 673 * @param top The top coordinate of the shape to render 674 * @param texture The texture reprsenting the shape 675 * @param paint The paint to draw the shape with 676 */ 677 status_t drawShape(float left, float top, const PathTexture* texture, SkPaint* paint); 678 679 /** 680 * Draws the specified texture as an alpha bitmap. Alpha bitmaps obey 681 * different compositing rules. 682 * 683 * @param texture The texture to draw with 684 * @param left The x coordinate of the bitmap 685 * @param top The y coordinate of the bitmap 686 * @param paint The paint to render with 687 */ 688 void drawAlphaBitmap(Texture* texture, float left, float top, SkPaint* paint); 689 690 /** 691 * Renders a strip of polygons with the specified paint, used for tessellated geometry. 692 * 693 * @param vertexBuffer The VertexBuffer to be drawn 694 * @param paint The paint to render with 695 * @param useOffset Offset the vertexBuffer (used in drawing non-AA lines) 696 */ 697 status_t drawVertexBuffer(const VertexBuffer& vertexBuffer, SkPaint* paint, 698 bool useOffset = false); 699 700 /** 701 * Renders the convex hull defined by the specified path as a strip of polygons. 702 * 703 * @param path The hull of the path to draw 704 * @param paint The paint to render with 705 */ 706 status_t drawConvexPath(const SkPath& path, SkPaint* paint); 707 708 /** 709 * Draws a textured rectangle with the specified texture. The specified coordinates 710 * are transformed by the current snapshot's transform matrix. 711 * 712 * @param left The left coordinate of the rectangle 713 * @param top The top coordinate of the rectangle 714 * @param right The right coordinate of the rectangle 715 * @param bottom The bottom coordinate of the rectangle 716 * @param texture The texture name to map onto the rectangle 717 * @param alpha An additional translucency parameter, between 0.0f and 1.0f 718 * @param mode The blending mode 719 * @param blend True if the texture contains an alpha channel 720 */ 721 void drawTextureRect(float left, float top, float right, float bottom, GLuint texture, 722 float alpha, SkXfermode::Mode mode, bool blend); 723 724 /** 725 * Draws a textured rectangle with the specified texture. The specified coordinates 726 * are transformed by the current snapshot's transform matrix. 727 * 728 * @param left The left coordinate of the rectangle 729 * @param top The top coordinate of the rectangle 730 * @param right The right coordinate of the rectangle 731 * @param bottom The bottom coordinate of the rectangle 732 * @param texture The texture to use 733 * @param paint The paint containing the alpha, blending mode, etc. 734 */ 735 void drawTextureRect(float left, float top, float right, float bottom, 736 Texture* texture, SkPaint* paint); 737 738 /** 739 * Draws a textured mesh with the specified texture. If the indices are omitted, 740 * the mesh is drawn as a simple quad. The mesh pointers become offsets when a 741 * VBO is bound. 742 * 743 * @param left The left coordinate of the rectangle 744 * @param top The top coordinate of the rectangle 745 * @param right The right coordinate of the rectangle 746 * @param bottom The bottom coordinate of the rectangle 747 * @param texture The texture name to map onto the rectangle 748 * @param alpha An additional translucency parameter, between 0.0f and 1.0f 749 * @param mode The blending mode 750 * @param blend True if the texture contains an alpha channel 751 * @param vertices The vertices that define the mesh 752 * @param texCoords The texture coordinates of each vertex 753 * @param elementsCount The number of elements in the mesh, required by indices 754 * @param swapSrcDst Whether or not the src and dst blending operations should be swapped 755 * @param ignoreTransform True if the current transform should be ignored 756 * @param vbo The VBO used to draw the mesh 757 * @param ignoreScale True if the model view matrix should not be scaled 758 * @param dirty True if calling this method should dirty the current layer 759 */ 760 void drawTextureMesh(float left, float top, float right, float bottom, GLuint texture, 761 float alpha, SkXfermode::Mode mode, bool blend, 762 GLvoid* vertices, GLvoid* texCoords, GLenum drawMode, GLsizei elementsCount, 763 bool swapSrcDst = false, bool ignoreTransform = false, GLuint vbo = 0, 764 bool ignoreScale = false, bool dirty = true); 765 766 void drawAlpha8TextureMesh(float left, float top, float right, float bottom, 767 GLuint texture, bool hasColor, int color, int alpha, SkXfermode::Mode mode, 768 GLvoid* vertices, GLvoid* texCoords, GLenum drawMode, GLsizei elementsCount, 769 bool ignoreTransform, bool dirty = true); 770 771 /** 772 * Draws text underline and strike-through if needed. 773 * 774 * @param text The text to decor 775 * @param bytesCount The number of bytes in the text 776 * @param length The length in pixels of the text, can be <= 0.0f to force a measurement 777 * @param x The x coordinate where the text will be drawn 778 * @param y The y coordinate where the text will be drawn 779 * @param paint The paint to draw the text with 780 */ 781 void drawTextDecorations(const char* text, int bytesCount, float length, 782 float x, float y, SkPaint* paint); 783 784 /** 785 * Draws shadow layer on text (with optional positions). 786 * 787 * @param paint The paint to draw the shadow with 788 * @param text The text to draw 789 * @param bytesCount The number of bytes in the text 790 * @param count The number of glyphs in the text 791 * @param positions The x, y positions of individual glyphs (or NULL) 792 * @param fontRenderer The font renderer object 793 * @param alpha The alpha value for drawing the shadow 794 * @param mode The xfermode for drawing the shadow 795 * @param x The x coordinate where the shadow will be drawn 796 * @param y The y coordinate where the shadow will be drawn 797 */ 798 void drawTextShadow(SkPaint* paint, const char* text, int bytesCount, int count, 799 const float* positions, FontRenderer& fontRenderer, int alpha, SkXfermode::Mode mode, 800 float x, float y); 801 802 /** 803 * Draws a path texture. Path textures are alpha8 bitmaps that need special 804 * compositing to apply colors/filters/etc. 805 * 806 * @param texture The texture to render 807 * @param x The x coordinate where the texture will be drawn 808 * @param y The y coordinate where the texture will be drawn 809 * @param paint The paint to draw the texture with 810 */ 811 void drawPathTexture(const PathTexture* texture, float x, float y, SkPaint* paint); 812 813 /** 814 * Resets the texture coordinates stored in mMeshVertices. Setting the values 815 * back to default is achieved by calling: 816 * 817 * resetDrawTextureTexCoords(0.0f, 0.0f, 1.0f, 1.0f); 818 * 819 * @param u1 The left coordinate of the texture 820 * @param v1 The bottom coordinate of the texture 821 * @param u2 The right coordinate of the texture 822 * @param v2 The top coordinate of the texture 823 */ 824 void resetDrawTextureTexCoords(float u1, float v1, float u2, float v2); 825 826 /** 827 * Returns true if the specified paint will draw invisible text. 828 */ 829 bool canSkipText(const SkPaint* paint) const; 830 831 /** 832 * Binds the specified texture. The texture unit must have been selected 833 * prior to calling this method. 834 */ 835 inline void bindTexture(GLuint texture) { 836 glBindTexture(GL_TEXTURE_2D, texture); 837 } 838 839 /** 840 * Binds the specified EGLImage texture. The texture unit must have been selected 841 * prior to calling this method. 842 */ 843 inline void bindExternalTexture(GLuint texture) { 844 glBindTexture(GL_TEXTURE_EXTERNAL_OES, texture); 845 } 846 847 /** 848 * Enable or disable blending as necessary. This function sets the appropriate 849 * blend function based on the specified xfermode. 850 */ 851 inline void chooseBlending(bool blend, SkXfermode::Mode mode, ProgramDescription& description, 852 bool swapSrcDst = false); 853 854 /** 855 * Use the specified program with the current GL context. If the program is already 856 * in use, it will not be bound again. If it is not in use, the current program is 857 * marked unused and the specified program becomes used and becomes the new 858 * current program. 859 * 860 * @param program The program to use 861 * 862 * @return true If the specified program was already in use, false otherwise. 863 */ 864 inline bool useProgram(Program* program); 865 866 /** 867 * Invoked before any drawing operation. This sets required state. 868 */ 869 void setupDraw(bool clear = true); 870 871 /** 872 * Various methods to setup OpenGL rendering. 873 */ 874 void setupDrawWithTexture(bool isAlpha8 = false); 875 void setupDrawWithTextureAndColor(bool isAlpha8 = false); 876 void setupDrawWithExternalTexture(); 877 void setupDrawNoTexture(); 878 void setupDrawAA(); 879 void setupDrawPoint(float pointSize); 880 void setupDrawColor(int color, int alpha); 881 void setupDrawColor(float r, float g, float b, float a); 882 void setupDrawAlpha8Color(int color, int alpha); 883 void setupDrawTextGamma(const SkPaint* paint); 884 void setupDrawShader(); 885 void setupDrawColorFilter(); 886 void setupDrawBlending(SkXfermode::Mode mode = SkXfermode::kSrcOver_Mode, 887 bool swapSrcDst = false); 888 void setupDrawBlending(bool blend = true, SkXfermode::Mode mode = SkXfermode::kSrcOver_Mode, 889 bool swapSrcDst = false); 890 void setupDrawProgram(); 891 void setupDrawDirtyRegionsDisabled(); 892 void setupDrawModelViewIdentity(bool offset = false); 893 void setupDrawModelView(float left, float top, float right, float bottom, 894 bool ignoreTransform = false, bool ignoreModelView = false); 895 void setupDrawModelViewTranslate(float left, float top, float right, float bottom, 896 bool ignoreTransform = false); 897 void setupDrawPointUniforms(); 898 void setupDrawColorUniforms(); 899 void setupDrawPureColorUniforms(); 900 void setupDrawShaderIdentityUniforms(); 901 void setupDrawShaderUniforms(bool ignoreTransform = false); 902 void setupDrawColorFilterUniforms(); 903 void setupDrawSimpleMesh(); 904 void setupDrawTexture(GLuint texture); 905 void setupDrawExternalTexture(GLuint texture); 906 void setupDrawTextureTransform(); 907 void setupDrawTextureTransformUniforms(mat4& transform); 908 void setupDrawTextGammaUniforms(); 909 void setupDrawMesh(GLvoid* vertices, GLvoid* texCoords = NULL, GLuint vbo = 0); 910 void setupDrawMesh(GLvoid* vertices, GLvoid* texCoords, GLvoid* colors); 911 void setupDrawMeshIndices(GLvoid* vertices, GLvoid* texCoords); 912 void setupDrawVertices(GLvoid* vertices); 913 void finishDrawTexture(); 914 void accountForClear(SkXfermode::Mode mode); 915 916 bool updateLayer(Layer* layer, bool inFrame); 917 void updateLayers(); 918 void flushLayers(); 919 920 /** 921 * Renders the specified region as a series of rectangles. This method 922 * is used for debugging only. 923 */ 924 void drawRegionRects(const Region& region); 925 926 /** 927 * Renders the specified region as a series of rectangles. The region 928 * must be in screen-space coordinates. 929 */ 930 void drawRegionRects(const SkRegion& region, int color, SkXfermode::Mode mode, 931 bool dirty = false); 932 933 /** 934 * Draws the current clip region if any. Only when DEBUG_CLIP_REGIONS 935 * is turned on. 936 */ 937 void debugClip(); 938 939 void debugOverdraw(bool enable, bool clear); 940 void renderOverdraw(); 941 942 /** 943 * Should be invoked every time the glScissor is modified. 944 */ 945 inline void dirtyClip() { 946 mDirtyClip = true; 947 } 948 949 inline mat4& currentTransform() const { 950 return *mSnapshot->transform; 951 } 952 953 // Dimensions of the drawing surface 954 int mWidth, mHeight; 955 956 // Matrix used for ortho projection in shaders 957 mat4 mOrthoMatrix; 958 959 // Model-view matrix used to position/size objects 960 mat4 mModelView; 961 962 // Number of saved states 963 int mSaveCount; 964 // Base state 965 sp<Snapshot> mFirstSnapshot; 966 // Current state 967 sp<Snapshot> mSnapshot; 968 // State used to define the clipping region 969 Rect mTilingClip; 970 // Is the target render surface opaque 971 bool mOpaque; 972 // Is a frame currently being rendered 973 bool mFrameStarted; 974 975 // Used to draw textured quads 976 TextureVertex mMeshVertices[4]; 977 978 // shader, filters, and shadow 979 DrawModifiers mDrawModifiers; 980 SkPaint mFilteredPaint; 981 982 // Various caches 983 Caches& mCaches; 984 Extensions& mExtensions; 985 986 // List of rectangles to clear after saveLayer() is invoked 987 Vector<Rect*> mLayers; 988 // List of functors to invoke after a frame is drawn 989 SortedVector<Functor*> mFunctors; 990 // List of layers to update at the beginning of a frame 991 Vector<Layer*> mLayerUpdates; 992 993 // Indicates whether the clip must be restored 994 bool mDirtyClip; 995 996 // The following fields are used to setup drawing 997 // Used to describe the shaders to generate 998 ProgramDescription mDescription; 999 // Color description 1000 bool mColorSet; 1001 float mColorA, mColorR, mColorG, mColorB; 1002 // Indicates that the shader should get a color 1003 bool mSetShaderColor; 1004 // Current texture unit 1005 GLuint mTextureUnit; 1006 // Track dirty regions, true by default 1007 bool mTrackDirtyRegions; 1008 // Indicate whether we are drawing an opaque frame 1009 bool mOpaqueFrame; 1010 1011 // See PROPERTY_DISABLE_SCISSOR_OPTIMIZATION in 1012 // Properties.h 1013 bool mScissorOptimizationDisabled; 1014 1015 // No-ops start/endTiling when set 1016 bool mSuppressTiling; 1017 1018 // Optional name of the renderer 1019 String8 mName; 1020 1021 friend class DisplayListRenderer; 1022 friend class Layer; 1023 friend class TextSetupFunctor; 1024 1025}; // class OpenGLRenderer 1026 1027}; // namespace uirenderer 1028}; // namespace android 1029 1030#endif // ANDROID_HWUI_OPENGL_RENDERER_H 1031