src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp

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  41
  42 /*
  43     When the active program changes, we need to update it's uniforms.
  44     We could track state for each program and only update stale uniforms
  45         - Could lead to lots of overhead if there's a lot of programs
  46     We could update all the uniforms when the program changes
  47         - Could end up updating lots of uniforms which don't need updating
  48
  49     Updating uniforms should be cheap, so the overhead of updating up-to-date
  50     uniforms should be minimal. It's also less complex.
  51
  52     Things which _may_ cause a different program to be used:
  53         - Change in brush/pen style
  54         - Change in painter opacity
  55         - Change in composition mode
  56
  57     Whenever we set a mode on the shader manager - it needs to tell us if it had
  58     to switch to a different program.
  59
  60     The shader manager should only switch when we tell it to. E.g. if we set a new
  61     brush style and then switch to transparent painter, we only want it to compile
  62     and use the correct program when we really need it.
  63 */
  64
  65 // #define QT_OPENGL_CACHE_AS_VBOS
  66
  67 #include "qglgradientcache_p.h"
  68 #include "qpaintengineex_opengl2_p.h"
  69
  70 #include <string.h> //for memcpy
  71 #include <qmath.h>
  72
  73 #include <private/qgl_p.h>
  74 #include <private/qmath_p.h>
  75 #include <private/qpaintengineex_p.h>
  76 #include <QPaintEngine>
  77 #include <private/qpainter_p.h>
  78 #include <private/qfontengine_p.h>
  79 #include <private/qdatabuffer_p.h>
  80 #include <private/qstatictext_p.h>
  81 #include <QtGui/private/qtriangulator_p.h>
  82
  83 #include "qglengineshadermanager_p.h"
  84 #include "qgl2pexvertexarray_p.h"
  85 #include "qtriangulatingstroker_p.h"
  86 #include "qtextureglyphcache_gl_p.h"
  87
  88 #include <QDebug>
  89
  90 QT_BEGIN_NAMESPACE
  91
  92
  93
  94 Q_GUI_EXPORT QImage qt_imageForBrush(int brushStyle, bool invert);
  95
  96 ////////////////////////////////// Private Methods //////////////////////////////////////////
  97
  98 QGL2PaintEngineExPrivate::~QGL2PaintEngineExPrivate()
  99 {
 100     delete shaderManager;
 101
 102     while (pathCaches.size()) {
 103         QVectorPath::CacheEntry *e = *(pathCaches.constBegin());
 104         e->cleanup(e->engine, e->data);
 105         e->data = 0;
 106         e->engine = 0;
 107     }
 108
 109     if (elementIndicesVBOId != 0) {
 110         glDeleteBuffers(1, &elementIndicesVBOId);
 111         elementIndicesVBOId = 0;
 112     }
 113 }
 114
 115 void QGL2PaintEngineExPrivate::updateTextureFilter(GLenum target, GLenum wrapMode, bool smoothPixmapTransform, GLuint id)
 116 {
 117 //    glActiveTexture(GL_TEXTURE0 + QT_BRUSH_TEXTURE_UNIT); //### Is it always this texture unit?
 118     if (id != GLuint(-1) && id == lastTextureUsed)
 119         return;
 120
 121     lastTextureUsed = id;
 122
 123     if (smoothPixmapTransform) {
 124         glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 125         glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 126     } else {
 127         glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 128         glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 129     }
 130     glTexParameteri(target, GL_TEXTURE_WRAP_S, wrapMode);
 131     glTexParameteri(target, GL_TEXTURE_WRAP_T, wrapMode);
 132 }
 133
 134
 135 inline QColor qt_premultiplyColor(QColor c, GLfloat opacity)
 136 {
 137     qreal alpha = c.alphaF() * opacity;
 138     c.setAlphaF(alpha);
 139     c.setRedF(c.redF() * alpha);
 140     c.setGreenF(c.greenF() * alpha);
 141     c.setBlueF(c.blueF() * alpha);
 142     return c;
 143 }
 144
 145
 146 void QGL2PaintEngineExPrivate::setBrush(const QBrush& brush)
 147 {
 148     if (qbrush_fast_equals(currentBrush, brush))
 149         return;
 150
 151     const Qt::BrushStyle newStyle = qbrush_style(brush);
 152     Q_ASSERT(newStyle != Qt::NoBrush);
 153
 154     currentBrush = brush;
 155     if (!currentBrushPixmap.isNull())
 156         currentBrushPixmap = QPixmap();
 157     brushUniformsDirty = true; // All brushes have at least one uniform
 158
 159     if (newStyle > Qt::SolidPattern)
 160         brushTextureDirty = true;
 161
 162     if (currentBrush.style() == Qt::TexturePattern
 163         && qHasPixmapTexture(brush) && brush.texture().isQBitmap())
 164     {
 165         shaderManager->setSrcPixelType(QGLEngineShaderManager::TextureSrcWithPattern);
 166     } else {
 167         shaderManager->setSrcPixelType(newStyle);
 168     }
 169     shaderManager->optimiseForBrushTransform(currentBrush.transform().type());
 170 }
 171
 172
 173 void QGL2PaintEngineExPrivate::useSimpleShader()
 174 {
 175     shaderManager->useSimpleProgram();
 176
 177     if (matrixDirty)
 178         updateMatrix();
 179 }
 180
 181 void QGL2PaintEngineExPrivate::updateBrushTexture()
 182 {
 183     Q_Q(QGL2PaintEngineEx);
 184 //     qDebug("QGL2PaintEngineExPrivate::updateBrushTexture()");
 185     Qt::BrushStyle style = currentBrush.style();
 186
 187     if ( (style >= Qt::Dense1Pattern) && (style <= Qt::DiagCrossPattern) ) {
 188         // Get the image data for the pattern
 189         QImage texImage = qt_imageForBrush(style, false);
 190
 191         glActiveTexture(GL_TEXTURE0 + QT_BRUSH_TEXTURE_UNIT);
 192         ctx->d_func()->bindTexture(texImage, GL_TEXTURE_2D, GL_RGBA, QGLContext::InternalBindOption);
 193         updateTextureFilter(GL_TEXTURE_2D, GL_REPEAT, q->state()->renderHints & QPainter::SmoothPixmapTransform);
 194     }
 195     else if (style >= Qt::LinearGradientPattern && style <= Qt::ConicalGradientPattern) {
 196         // Gradiant brush: All the gradiants use the same texture
 197
 198         const QGradient* g = currentBrush.gradient();
 199
 200         // We apply global opacity in the fragment shaders, so we always pass 1.0
 201         // for opacity to the cache.
 202         GLuint texId = QGL2GradientCache::cacheForContext(ctx)->getBuffer(*g, 1.0);
 203
 204         glActiveTexture(GL_TEXTURE0 + QT_BRUSH_TEXTURE_UNIT);
 205         glBindTexture(GL_TEXTURE_2D, texId);
 206
 207         if (g->spread() == QGradient::RepeatSpread || g->type() == QGradient::ConicalGradient)
 208             updateTextureFilter(GL_TEXTURE_2D, GL_REPEAT, q->state()->renderHints & QPainter::SmoothPixmapTransform);
 209         else if (g->spread() == QGradient::ReflectSpread)
 210             updateTextureFilter(GL_TEXTURE_2D, GL_MIRRORED_REPEAT_IBM, q->state()->renderHints & QPainter::SmoothPixmapTransform);
 211         else
 212             updateTextureFilter(GL_TEXTURE_2D, GL_CLAMP_TO_EDGE, q->state()->renderHints & QPainter::SmoothPixmapTransform);
 213     }
 214     else if (style == Qt::TexturePattern) {
 215         currentBrushPixmap = currentBrush.texture();
 216
 217         int max_texture_size = ctx->d_func()->maxTextureSize();
 218         if (currentBrushPixmap.width() > max_texture_size || currentBrushPixmap.height() > max_texture_size)
 219             currentBrushPixmap = currentBrushPixmap.scaled(max_texture_size, max_texture_size, Qt::KeepAspectRatio);
 220
 221         glActiveTexture(GL_TEXTURE0 + QT_BRUSH_TEXTURE_UNIT);
 222         QGLTexture *tex = ctx->d_func()->bindTexture(currentBrushPixmap, GL_TEXTURE_2D, GL_RGBA,
 223                                                      QGLContext::InternalBindOption |
 224                                                      QGLContext::CanFlipNativePixmapBindOption);
 225         updateTextureFilter(GL_TEXTURE_2D, GL_REPEAT, q->state()->renderHints & QPainter::SmoothPixmapTransform);
 226         textureInvertedY = tex->options & QGLContext::InvertedYBindOption ? -1 : 1;
 227     }
 228     brushTextureDirty = false;
 229 }
 230
 231
 232 void QGL2PaintEngineExPrivate::updateBrushUniforms()
 233 {
 234 //     qDebug("QGL2PaintEngineExPrivate::updateBrushUniforms()");
 235     Qt::BrushStyle style = currentBrush.style();
 236
 237     if (style == Qt::NoBrush)
 238         return;
 239
 240     QTransform brushQTransform = currentBrush.transform();
 241
 242     if (style == Qt::SolidPattern) {
 243         QColor col = qt_premultiplyColor(currentBrush.color(), (GLfloat)q->state()->opacity);
 244         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::FragmentColor), col);
 245     }
 246     else {
 247         // All other brushes have a transform and thus need the translation point:
 248         QPointF translationPoint;
 249
 250         if (style <= Qt::DiagCrossPattern) {
 251             QColor col = qt_premultiplyColor(currentBrush.color(), (GLfloat)q->state()->opacity);
 252
 253             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::PatternColor), col);
 254
 255             QVector2D halfViewportSize(width*0.5, height*0.5);
 256             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::HalfViewportSize), halfViewportSize);
 257         }
 258         else if (style == Qt::LinearGradientPattern) {
 259             const QLinearGradient *g = static_cast<const QLinearGradient *>(currentBrush.gradient());
 260
 261             QPointF realStart = g->start();
 262             QPointF realFinal = g->finalStop();
 263             translationPoint = realStart;
 264
 265             QPointF l = realFinal - realStart;
 266
 267             QVector3D linearData(
 268                 l.x(),
 269                 l.y(),
 270                 1.0f / (l.x() * l.x() + l.y() * l.y())
 271             );
 272
 273             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::LinearData), linearData);
 274
 275             QVector2D halfViewportSize(width*0.5, height*0.5);
 276             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::HalfViewportSize), halfViewportSize);
 277         }
 278         else if (style == Qt::ConicalGradientPattern) {
 279             const QConicalGradient *g = static_cast<const QConicalGradient *>(currentBrush.gradient());
 280             translationPoint   = g->center();
 281
 282             GLfloat angle = -(g->angle() * 2 * Q_PI) / 360.0;
 283
 284             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::Angle), angle);
 285
 286             QVector2D halfViewportSize(width*0.5, height*0.5);
 287             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::HalfViewportSize), halfViewportSize);
 288         }
 289         else if (style == Qt::RadialGradientPattern) {
 290             const QRadialGradient *g = static_cast<const QRadialGradient *>(currentBrush.gradient());
 291             QPointF realCenter = g->center();
 292             QPointF realFocal  = g->focalPoint();
 293             qreal   realRadius = g->centerRadius() - g->focalRadius();
 294             translationPoint   = realFocal;
 295
 296             QPointF fmp = realCenter - realFocal;
 297             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::Fmp), fmp);
 298
 299             GLfloat fmp2_m_radius2 = -fmp.x() * fmp.x() - fmp.y() * fmp.y() + realRadius*realRadius;
 300             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::Fmp2MRadius2), fmp2_m_radius2);
 301             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::Inverse2Fmp2MRadius2),
 302                                                              GLfloat(1.0 / (2.0*fmp2_m_radius2)));
 303             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::SqrFr),
 304                                                              GLfloat(g->focalRadius() * g->focalRadius()));
 305             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::BRadius),
 306                                                              GLfloat(2 * (g->centerRadius() - g->focalRadius()) * g->focalRadius()),
 307                                                              g->focalRadius(),
 308                                                              g->centerRadius() - g->focalRadius());
 309
 310             QVector2D halfViewportSize(width*0.5, height*0.5);
 311             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::HalfViewportSize), halfViewportSize);
 312         }
 313         else if (style == Qt::TexturePattern) {
 314             const QPixmap& texPixmap = currentBrush.texture();
 315
 316             if (qHasPixmapTexture(currentBrush) && currentBrush.texture().isQBitmap()) {
 317                 QColor col = qt_premultiplyColor(currentBrush.color(), (GLfloat)q->state()->opacity);
 318                 shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::PatternColor), col);
 319             }
 320
 321             QSizeF invertedTextureSize(1.0 / texPixmap.width(), 1.0 / texPixmap.height());
 322             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::InvertedTextureSize), invertedTextureSize);
 323
 324             QVector2D halfViewportSize(width*0.5, height*0.5);
 325             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::HalfViewportSize), halfViewportSize);
 326         }
 327         else
 328             qWarning("QGL2PaintEngineEx: Unimplemented fill style");
 329
 330         const QPointF &brushOrigin = q->state()->brushOrigin;
 331         QTransform matrix = q->state()->matrix;
 332         matrix.translate(brushOrigin.x(), brushOrigin.y());
 333
 334         QTransform translate(1, 0, 0, 1, -translationPoint.x(), -translationPoint.y());
 335         qreal m22 = -1;
 336         qreal dy = height;
 337         if (device->isFlipped()) {
 338             m22 = 1;
 339             dy = 0;
 340         }
 341         QTransform gl_to_qt(1, 0, 0, m22, 0, dy);
 342         QTransform inv_matrix;
 343         if (style == Qt::TexturePattern && textureInvertedY == -1)
 344             inv_matrix = gl_to_qt * (QTransform(1, 0, 0, -1, 0, currentBrush.texture().height()) * brushQTransform * matrix).inverted() * translate;
 345         else
 346             inv_matrix = gl_to_qt * (brushQTransform * matrix).inverted() * translate;
 347
 348         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::BrushTransform), inv_matrix);
 349         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::BrushTexture), QT_BRUSH_TEXTURE_UNIT);
 350     }
 351     brushUniformsDirty = false;
 352 }
 353
 354
 355 // This assumes the shader manager has already setup the correct shader program
 356 void QGL2PaintEngineExPrivate::updateMatrix()
 357 {
 358 //     qDebug("QGL2PaintEngineExPrivate::updateMatrix()");
 359
 360     const QTransform& transform = q->state()->matrix;
 361
 362     // The projection matrix converts from Qt's coordinate system to GL's coordinate system
 363     //    * GL's viewport is 2x2, Qt's is width x height
 364     //    * GL has +y -> -y going from bottom -> top, Qt is the other way round
 365     //    * GL has [0,0] in the center, Qt has it in the top-left
 366     //
 367     // This results in the Projection matrix below, which is multiplied by the painter's
 368     // transformation matrix, as shown below:
 369     //
 370     //                Projection Matrix                      Painter Transform
 371     // ------------------------------------------------   ------------------------
 372     // | 2.0 / width  |      0.0      |     -1.0      |   |  m11  |  m21  |  dx  |
 373     // |     0.0      | -2.0 / height |      1.0      | * |  m12  |  m22  |  dy  |
 374     // |     0.0      |      0.0      |      1.0      |   |  m13  |  m23  |  m33 |
 375     // ------------------------------------------------   ------------------------
 376     //
 377     // NOTE: The resultant matrix is also transposed, as GL expects column-major matracies
 378
 379     const GLfloat wfactor = 2.0f / width;
 380     GLfloat hfactor = -2.0f / height;
 381
 382     GLfloat dx = transform.dx();
 383     GLfloat dy = transform.dy();
 384
 385     if (device->isFlipped()) {
 386         hfactor *= -1;
 387         dy -= height;
 388     }
 389
 390     // Non-integer translates can have strange effects for some rendering operations such as
 391     // anti-aliased text rendering. In such cases, we snap the translate to the pixel grid.
 392     if (snapToPixelGrid && transform.type() == QTransform::TxTranslate) {
 393         // 0.50 needs to rounded down to 0.0 for consistency with raster engine:
 394         dx = ceilf(dx - 0.5f);
 395         dy = ceilf(dy - 0.5f);
 396     }
 397     pmvMatrix[0][0] = (wfactor * transform.m11())  - transform.m13();
 398     pmvMatrix[1][0] = (wfactor * transform.m21())  - transform.m23();
 399     pmvMatrix[2][0] = (wfactor * dx) - transform.m33();
 400     pmvMatrix[0][1] = (hfactor * transform.m12())  + transform.m13();
 401     pmvMatrix[1][1] = (hfactor * transform.m22())  + transform.m23();
 402     pmvMatrix[2][1] = (hfactor * dy) + transform.m33();
 403     pmvMatrix[0][2] = transform.m13();
 404     pmvMatrix[1][2] = transform.m23();
 405     pmvMatrix[2][2] = transform.m33();
 406
 407     // 1/10000 == 0.0001, so we have good enough res to cover curves
 408     // that span the entire widget...
 409     inverseScale = qMax(1 / qMax( qMax(qAbs(transform.m11()), qAbs(transform.m22())),
 410                                   qMax(qAbs(transform.m12()), qAbs(transform.m21())) ),
 411                         qreal(0.0001));
 412
 413     matrixDirty = false;
 414     matrixUniformDirty = true;
 415
 416     // Set the PMV matrix attribute. As we use an attributes rather than uniforms, we only
 417     // need to do this once for every matrix change and persists across all shader programs.
 418     glVertexAttrib3fv(QT_PMV_MATRIX_1_ATTR, pmvMatrix[0]);
 419     glVertexAttrib3fv(QT_PMV_MATRIX_2_ATTR, pmvMatrix[1]);
 420     glVertexAttrib3fv(QT_PMV_MATRIX_3_ATTR, pmvMatrix[2]);
 421
 422     dasher.setInvScale(inverseScale);
 423     stroker.setInvScale(inverseScale);
 424 }
 425
 426
 427 void QGL2PaintEngineExPrivate::updateCompositionMode()
 428 {
 429     // NOTE: The entire paint engine works on pre-multiplied data - which is why some of these
 430     //       composition modes look odd.
 431 //     qDebug() << "QGL2PaintEngineExPrivate::updateCompositionMode() - Setting GL composition mode for " << q->state()->composition_mode;
 432     switch(q->state()->composition_mode) {
 433     case QPainter::CompositionMode_SourceOver:
 434         glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
 435         break;
 436     case QPainter::CompositionMode_DestinationOver:
 437         glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_ONE);
 438         break;
 439     case QPainter::CompositionMode_Clear:
 440         glBlendFunc(GL_ZERO, GL_ZERO);
 441         break;
 442     case QPainter::CompositionMode_Source:
 443         glBlendFunc(GL_ONE, GL_ZERO);
 444         break;
 445     case QPainter::CompositionMode_Destination:
 446         glBlendFunc(GL_ZERO, GL_ONE);
 447         break;
 448     case QPainter::CompositionMode_SourceIn:
 449         glBlendFunc(GL_DST_ALPHA, GL_ZERO);
 450         break;
 451     case QPainter::CompositionMode_DestinationIn:
 452         glBlendFunc(GL_ZERO, GL_SRC_ALPHA);
 453         break;
 454     case QPainter::CompositionMode_SourceOut:
 455         glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_ZERO);
 456         break;
 457     case QPainter::CompositionMode_DestinationOut:
 458         glBlendFunc(GL_ZERO, GL_ONE_MINUS_SRC_ALPHA);
 459         break;
 460     case QPainter::CompositionMode_SourceAtop:
 461         glBlendFunc(GL_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 462         break;
 463     case QPainter::CompositionMode_DestinationAtop:
 464         glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_SRC_ALPHA);
 465         break;
 466     case QPainter::CompositionMode_Xor:
 467         glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 468         break;
 469     case QPainter::CompositionMode_Plus:
 470         glBlendFunc(GL_ONE, GL_ONE);
 471         break;
 472     default:
 473         qWarning("Unsupported composition mode");
 474         break;
 475     }
 476
 477     compositionModeDirty = false;
 478 }
 479
 480 static inline void setCoords(GLfloat *coords, const QGLRect &rect)
 481 {
 482     coords[0] = rect.left;
 483     coords[1] = rect.top;
 484     coords[2] = rect.right;
 485     coords[3] = rect.top;
 486     coords[4] = rect.right;
 487     coords[5] = rect.bottom;
 488     coords[6] = rect.left;
 489     coords[7] = rect.bottom;
 490 }
 491
 492 void QGL2PaintEngineExPrivate::drawTexture(const QGLRect& dest, const QGLRect& src, const QSize &textureSize, bool opaque, bool pattern)
 493 {
 494     // Setup for texture drawing
 495     currentBrush = noBrush;
 496     shaderManager->setSrcPixelType(pattern ? QGLEngineShaderManager::PatternSrc : QGLEngineShaderManager::ImageSrc);
 497
 498     if (snapToPixelGrid) {
 499         snapToPixelGrid = false;
 500         matrixDirty = true;
 501     }
 502
 503     if (prepareForDraw(opaque))
 504         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::ImageTexture), QT_IMAGE_TEXTURE_UNIT);
 505
 506     if (pattern) {
 507         QColor col = qt_premultiplyColor(q->state()->pen.color(), (GLfloat)q->state()->opacity);
 508         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::PatternColor), col);
 509     }
 510
 511     GLfloat dx = 1.0 / textureSize.width();
 512     GLfloat dy = 1.0 / textureSize.height();
 513
 514     QGLRect srcTextureRect(src.left*dx, src.top*dy, src.right*dx, src.bottom*dy);
 515
 516     setCoords(staticVertexCoordinateArray, dest);
 517     setCoords(staticTextureCoordinateArray, srcTextureRect);
 518
 519     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 520 }
 521
 522 void QGL2PaintEngineEx::beginNativePainting()
 523 {
 524     Q_D(QGL2PaintEngineEx);
 525     ensureActive();
 526     d->transferMode(BrushDrawingMode);
 527
 528     d->nativePaintingActive = true;
 529
 530     QGLContext *ctx = d->ctx;
 531     glUseProgram(0);
 532
 533     // Disable all the vertex attribute arrays:
 534     for (int i = 0; i < QT_GL_VERTEX_ARRAY_TRACKED_COUNT; ++i)
 535         glDisableVertexAttribArray(i);
 536
 537 #ifndef QT_OPENGL_ES_2
 538     const QGLFormat &fmt = d->device->format();
 539     if (fmt.majorVersion() < 3 || (fmt.majorVersion() == 3 && fmt.minorVersion() < 1)
 540         || fmt.profile() == QGLFormat::CompatibilityProfile)
 541     {
 542         // be nice to people who mix OpenGL 1.x code with QPainter commands
 543         // by setting modelview and projection matrices to mirror the GL 1
 544         // paint engine
 545         const QTransform& mtx = state()->matrix;
 546
 547         float mv_matrix[4][4] =
 548         {
 549             { float(mtx.m11()), float(mtx.m12()),     0, float(mtx.m13()) },
 550             { float(mtx.m21()), float(mtx.m22()),     0, float(mtx.m23()) },
 551             {                0,                0,     1,                0 },
 552             {  float(mtx.dx()),  float(mtx.dy()),     0, float(mtx.m33()) }
 553         };
 554
 555         const QSize sz = d->device->size();
 556
 557         glMatrixMode(GL_PROJECTION);
 558         glLoadIdentity();
 559         glOrtho(0, sz.width(), sz.height(), 0, -999999, 999999);
 560
 561         glMatrixMode(GL_MODELVIEW);
 562         glLoadMatrixf(&mv_matrix[0][0]);
 563     }
 564 #else
 565     Q_UNUSED(ctx);
 566 #endif
 567
 568     d->lastTextureUsed = GLuint(-1);
 569     d->dirtyStencilRegion = QRect(0, 0, d->width, d->height);
 570     d->resetGLState();
 571
 572     d->shaderManager->setDirty();
 573
 574     d->needsSync = true;
 575 }
 576
 577 void QGL2PaintEngineExPrivate::resetGLState()
 578 {
 579     glDisable(GL_BLEND);
 580     glActiveTexture(GL_TEXTURE0);
 581     glDisable(GL_STENCIL_TEST);
 582     glDisable(GL_DEPTH_TEST);
 583     glDisable(GL_SCISSOR_TEST);
 584     glDepthMask(true);
 585     glDepthFunc(GL_LESS);
 586     glClearDepth(1);
 587     glStencilMask(0xff);
 588     glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
 589     glStencilFunc(GL_ALWAYS, 0, 0xff);
 590     ctx->d_func()->setVertexAttribArrayEnabled(QT_TEXTURE_COORDS_ATTR, false);
 591     ctx->d_func()->setVertexAttribArrayEnabled(QT_VERTEX_COORDS_ATTR, false);
 592     ctx->d_func()->setVertexAttribArrayEnabled(QT_OPACITY_ATTR, false);
 593 #ifndef QT_OPENGL_ES_2
 594     // gl_Color, corresponding to vertex attribute 3, may have been changed
 595     float color[] = { 1.0f, 1.0f, 1.0f, 1.0f };
 596     glVertexAttrib4fv(3, color);
 597 #endif
 598 }
 599
 600 void QGL2PaintEngineEx::endNativePainting()
 601 {
 602     Q_D(QGL2PaintEngineEx);
 603     d->needsSync = true;
 604     d->nativePaintingActive = false;
 605 }
 606
 607 void QGL2PaintEngineEx::invalidateState()
 608 {
 609     Q_D(QGL2PaintEngineEx);
 610     d->needsSync = true;
 611 }
 612
 613 bool QGL2PaintEngineEx::isNativePaintingActive() const {
 614     Q_D(const QGL2PaintEngineEx);
 615     return d->nativePaintingActive;
 616 }
 617
 618 void QGL2PaintEngineExPrivate::transferMode(EngineMode newMode)
 619 {
 620     if (newMode == mode)
 621         return;
 622
 623     if (mode == TextDrawingMode || mode == ImageDrawingMode || mode == ImageArrayDrawingMode) {
 624         lastTextureUsed = GLuint(-1);
 625     }
 626
 627     if (newMode == TextDrawingMode) {
 628         shaderManager->setHasComplexGeometry(true);
 629     } else {
 630         shaderManager->setHasComplexGeometry(false);
 631     }
 632
 633     if (newMode == ImageDrawingMode) {
 634         setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, staticVertexCoordinateArray);
 635         setVertexAttributePointer(QT_TEXTURE_COORDS_ATTR, staticTextureCoordinateArray);
 636     }
 637
 638     if (newMode == ImageArrayDrawingMode) {
 639         setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, (GLfloat*)vertexCoordinateArray.data());
 640         setVertexAttributePointer(QT_TEXTURE_COORDS_ATTR, (GLfloat*)textureCoordinateArray.data());
 641         setVertexAttributePointer(QT_OPACITY_ATTR, (GLfloat*)opacityArray.data());
 642     }
 643
 644     // This needs to change when we implement high-quality anti-aliasing...
 645     if (newMode != TextDrawingMode)
 646         shaderManager->setMaskType(QGLEngineShaderManager::NoMask);
 647
 648     mode = newMode;
 649 }
 650
 651 struct QGL2PEVectorPathCache
 652 {
 653 #ifdef QT_OPENGL_CACHE_AS_VBOS
 654     GLuint vbo;
 655     GLuint ibo;
 656 #else
 657     float *vertices;
 658     void *indices;
 659 #endif
 660     int vertexCount;
 661     int indexCount;
 662     GLenum primitiveType;
 663     qreal iscale;
 664     QVertexIndexVector::Type indexType;
 665 };
 666
 667 void QGL2PaintEngineExPrivate::cleanupVectorPath(QPaintEngineEx *engine, void *data)
 668 {
 669     QGL2PEVectorPathCache *c = (QGL2PEVectorPathCache *) data;
 670 #ifdef QT_OPENGL_CACHE_AS_VBOS
 671     Q_ASSERT(engine->type() == QPaintEngine::OpenGL2);
 672     static_cast<QGL2PaintEngineEx *>(engine)->d_func()->unusedVBOSToClean << c->vbo;
 673     if (c->ibo)
 674         d->unusedIBOSToClean << c->ibo;
 675 #else
 676     Q_UNUSED(engine);
 677     free(c->vertices);
 678     free(c->indices);
 679 #endif
 680     delete c;
 681 }
 682
 683 // Assumes everything is configured for the brush you want to use
 684 void QGL2PaintEngineExPrivate::fill(const QVectorPath& path)
 685 {
 686     transferMode(BrushDrawingMode);
 687
 688     if (snapToPixelGrid) {
 689         snapToPixelGrid = false;
 690         matrixDirty = true;
 691     }
 692
 693     // Might need to call updateMatrix to re-calculate inverseScale
 694     if (matrixDirty)
 695         updateMatrix();
 696
 697     const QPointF* const points = reinterpret_cast<const QPointF*>(path.points());
 698
 699     // Check to see if there's any hints
 700     if (path.shape() == QVectorPath::RectangleHint) {
 701         QGLRect rect(points[0].x(), points[0].y(), points[2].x(), points[2].y());
 702         prepareForDraw(currentBrush.isOpaque());
 703         composite(rect);
 704     } else if (path.isConvex()) {
 705
 706         if (path.isCacheable()) {
 707             QVectorPath::CacheEntry *data = path.lookupCacheData(q);
 708             QGL2PEVectorPathCache *cache;
 709
 710             bool updateCache = false;
 711
 712             if (data) {
 713                 cache = (QGL2PEVectorPathCache *) data->data;
 714                 // Check if scale factor is exceeded for curved paths and generate curves if so...
 715                 if (path.isCurved()) {
 716                     qreal scaleFactor = cache->iscale / inverseScale;
 717                     if (scaleFactor < 0.5 || scaleFactor > 2.0) {
 718 #ifdef QT_OPENGL_CACHE_AS_VBOS
 719                         glDeleteBuffers(1, &cache->vbo);
 720                         cache->vbo = 0;
 721                         Q_ASSERT(cache->ibo == 0);
 722 #else
 723                         free(cache->vertices);
 724                         Q_ASSERT(cache->indices == 0);
 725 #endif
 726                         updateCache = true;
 727                     }
 728                 }
 729             } else {
 730                 cache = new QGL2PEVectorPathCache;
 731                 data = const_cast<QVectorPath &>(path).addCacheData(q, cache, cleanupVectorPath);
 732                 updateCache = true;
 733             }
 734
 735             // Flatten the path at the current scale factor and fill it into the cache struct.
 736             if (updateCache) {
 737                 vertexCoordinateArray.clear();
 738                 vertexCoordinateArray.addPath(path, inverseScale, false);
 739                 int vertexCount = vertexCoordinateArray.vertexCount();
 740                 int floatSizeInBytes = vertexCount * 2 * sizeof(float);
 741                 cache->vertexCount = vertexCount;
 742                 cache->indexCount = 0;
 743                 cache->primitiveType = GL_TRIANGLE_FAN;
 744                 cache->iscale = inverseScale;
 745 #ifdef QT_OPENGL_CACHE_AS_VBOS
 746                 glGenBuffers(1, &cache->vbo);
 747                 glBindBuffer(GL_ARRAY_BUFFER, cache->vbo);
 748                 glBufferData(GL_ARRAY_BUFFER, floatSizeInBytes, vertexCoordinateArray.data(), GL_STATIC_DRAW);
 749                 cache->ibo = 0;
 750 #else
 751                 cache->vertices = (float *) malloc(floatSizeInBytes);
 752                 memcpy(cache->vertices, vertexCoordinateArray.data(), floatSizeInBytes);
 753                 cache->indices = 0;
 754 #endif
 755             }
 756
 757             prepareForDraw(currentBrush.isOpaque());
 758 #ifdef QT_OPENGL_CACHE_AS_VBOS
 759             glBindBuffer(GL_ARRAY_BUFFER, cache->vbo);
 760             setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, 0);
 761 #else
 762             setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, cache->vertices);
 763 #endif
 764             glDrawArrays(cache->primitiveType, 0, cache->vertexCount);
 765
 766         } else {
 767       //        printf(" - Marking path as cachable...\n");
 768             // Tag it for later so that if the same path is drawn twice, it is assumed to be static and thus cachable
 769             path.makeCacheable();
 770             vertexCoordinateArray.clear();
 771             vertexCoordinateArray.addPath(path, inverseScale, false);
 772             prepareForDraw(currentBrush.isOpaque());
 773             drawVertexArrays(vertexCoordinateArray, GL_TRIANGLE_FAN);
 774         }
 775
 776     } else {
 777         bool useCache = path.isCacheable();
 778         if (useCache) {
 779             QRectF bbox = path.controlPointRect();
 780             // If the path doesn't fit within these limits, it is possible that the triangulation will fail.
 781             useCache &= (bbox.left() > -0x8000 * inverseScale)
 782                      && (bbox.right() < 0x8000 * inverseScale)
 783                      && (bbox.top() > -0x8000 * inverseScale)
 784                      && (bbox.bottom() < 0x8000 * inverseScale);
 785         }
 786
 787         if (useCache) {
 788             QVectorPath::CacheEntry *data = path.lookupCacheData(q);
 789             QGL2PEVectorPathCache *cache;
 790
 791             bool updateCache = false;
 792
 793             if (data) {
 794                 cache = (QGL2PEVectorPathCache *) data->data;
 795                 // Check if scale factor is exceeded for curved paths and generate curves if so...
 796                 if (path.isCurved()) {
 797                     qreal scaleFactor = cache->iscale / inverseScale;
 798                     if (scaleFactor < 0.5 || scaleFactor > 2.0) {
 799 #ifdef QT_OPENGL_CACHE_AS_VBOS
 800                         glDeleteBuffers(1, &cache->vbo);
 801                         glDeleteBuffers(1, &cache->ibo);
 802 #else
 803                         free(cache->vertices);
 804                         free(cache->indices);
 805 #endif
 806                         updateCache = true;
 807                     }
 808                 }
 809             } else {
 810                 cache = new QGL2PEVectorPathCache;
 811                 data = const_cast<QVectorPath &>(path).addCacheData(q, cache, cleanupVectorPath);
 812                 updateCache = true;
 813             }
 814
 815             // Flatten the path at the current scale factor and fill it into the cache struct.
 816             if (updateCache) {
 817                 QTriangleSet polys = qTriangulate(path, QTransform().scale(1 / inverseScale, 1 / inverseScale));
 818                 cache->vertexCount = polys.vertices.size() / 2;
 819                 cache->indexCount = polys.indices.size();
 820                 cache->primitiveType = GL_TRIANGLES;
 821                 cache->iscale = inverseScale;
 822                 cache->indexType = polys.indices.type();
 823 #ifdef QT_OPENGL_CACHE_AS_VBOS
 824                 glGenBuffers(1, &cache->vbo);
 825                 glGenBuffers(1, &cache->ibo);
 826                 glBindBuffer(GL_ARRAY_BUFFER, cache->vbo);
 827                 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cache->ibo);
 828
 829                 if (polys.indices.type() == QVertexIndexVector::UnsignedInt)
 830                     glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(quint32) * polys.indices.size(), polys.indices.data(), GL_STATIC_DRAW);
 831                 else
 832                     glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(quint16) * polys.indices.size(), polys.indices.data(), GL_STATIC_DRAW);
 833
 834                 QVarLengthArray<float> vertices(polys.vertices.size());
 835                 for (int i = 0; i < polys.vertices.size(); ++i)
 836                     vertices[i] = float(inverseScale * polys.vertices.at(i));
 837                 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * vertices.size(), vertices.data(), GL_STATIC_DRAW);
 838 #else
 839                 cache->vertices = (float *) malloc(sizeof(float) * polys.vertices.size());
 840                 if (polys.indices.type() == QVertexIndexVector::UnsignedInt) {
 841                     cache->indices = (quint32 *) malloc(sizeof(quint32) * polys.indices.size());
 842                     memcpy(cache->indices, polys.indices.data(), sizeof(quint32) * polys.indices.size());
 843                 } else {
 844                     cache->indices = (quint16 *) malloc(sizeof(quint16) * polys.indices.size());
 845                     memcpy(cache->indices, polys.indices.data(), sizeof(quint16) * polys.indices.size());
 846                 }
 847                 for (int i = 0; i < polys.vertices.size(); ++i)
 848                     cache->vertices[i] = float(inverseScale * polys.vertices.at(i));
 849 #endif
 850             }
 851
 852             prepareForDraw(currentBrush.isOpaque());
 853 #ifdef QT_OPENGL_CACHE_AS_VBOS
 854             glBindBuffer(GL_ARRAY_BUFFER, cache->vbo);
 855             glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cache->ibo);
 856             setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, 0);
 857             if (cache->indexType == QVertexIndexVector::UnsignedInt)
 858                 glDrawElements(cache->primitiveType, cache->indexCount, GL_UNSIGNED_INT, 0);
 859             else
 860                 glDrawElements(cache->primitiveType, cache->indexCount, GL_UNSIGNED_SHORT, 0);
 861             glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
 862             glBindBuffer(GL_ARRAY_BUFFER, 0);
 863 #else
 864             setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, cache->vertices);
 865             if (cache->indexType == QVertexIndexVector::UnsignedInt)
 866                 glDrawElements(cache->primitiveType, cache->indexCount, GL_UNSIGNED_INT, (qint32 *)cache->indices);
 867             else
 868                 glDrawElements(cache->primitiveType, cache->indexCount, GL_UNSIGNED_SHORT, (qint16 *)cache->indices);
 869 #endif
 870
 871         } else {
 872       //        printf(" - Marking path as cachable...\n");
 873             // Tag it for later so that if the same path is drawn twice, it is assumed to be static and thus cachable
 874             path.makeCacheable();
 875
 876             if (!device->format().stencil()) {
 877                 // If there is no stencil buffer, triangulate the path instead.
 878
 879                 QRectF bbox = path.controlPointRect();
 880                 // If the path doesn't fit within these limits, it is possible that the triangulation will fail.
 881                 bool withinLimits = (bbox.left() > -0x8000 * inverseScale)
 882                                   && (bbox.right() < 0x8000 * inverseScale)
 883                                   && (bbox.top() > -0x8000 * inverseScale)
 884                                   && (bbox.bottom() < 0x8000 * inverseScale);
 885                 if (withinLimits) {
 886                     QTriangleSet polys = qTriangulate(path, QTransform().scale(1 / inverseScale, 1 / inverseScale));
 887
 888                     QVarLengthArray<float> vertices(polys.vertices.size());
 889                     for (int i = 0; i < polys.vertices.size(); ++i)
 890                         vertices[i] = float(inverseScale * polys.vertices.at(i));
 891
 892                     prepareForDraw(currentBrush.isOpaque());
 893                     setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, vertices.constData());
 894                     if (polys.indices.type() == QVertexIndexVector::UnsignedInt)
 895                         glDrawElements(GL_TRIANGLES, polys.indices.size(), GL_UNSIGNED_INT, polys.indices.data());
 896                     else
 897                         glDrawElements(GL_TRIANGLES, polys.indices.size(), GL_UNSIGNED_SHORT, polys.indices.data());
 898                 } else {
 899                     // We can't handle big, concave painter paths with OpenGL without stencil buffer.
 900                     qWarning("Painter path exceeds +/-32767 pixels.");
 901                 }
 902                 return;
 903             }
 904
 905             // The path is too complicated & needs the stencil technique
 906             vertexCoordinateArray.clear();
 907             vertexCoordinateArray.addPath(path, inverseScale, false);
 908
 909             fillStencilWithVertexArray(vertexCoordinateArray, path.hasWindingFill());
 910
 911             glStencilMask(0xff);
 912             glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE);
 913
 914             if (q->state()->clipTestEnabled) {
 915                 // Pass when high bit is set, replace stencil value with current clip
 916                 glStencilFunc(GL_NOTEQUAL, q->state()->currentClip, GL_STENCIL_HIGH_BIT);
 917             } else if (path.hasWindingFill()) {
 918                 // Pass when any bit is set, replace stencil value with 0
 919                 glStencilFunc(GL_NOTEQUAL, 0, 0xff);
 920             } else {
 921                 // Pass when high bit is set, replace stencil value with 0
 922                 glStencilFunc(GL_NOTEQUAL, 0, GL_STENCIL_HIGH_BIT);
 923             }
 924             prepareForDraw(currentBrush.isOpaque());
 925
 926             // Stencil the brush onto the dest buffer
 927             composite(vertexCoordinateArray.boundingRect());
 928             glStencilMask(0);
 929             updateClipScissorTest();
 930         }
 931     }
 932 }
 933
 934
 935 void QGL2PaintEngineExPrivate::fillStencilWithVertexArray(const float *data,
 936                                                           int count,
 937                                                           int *stops,
 938                                                           int stopCount,
 939                                                           const QGLRect &bounds,
 940                                                           StencilFillMode mode)
 941 {
 942     Q_ASSERT(count || stops);
 943
 944 //     qDebug("QGL2PaintEngineExPrivate::fillStencilWithVertexArray()");
 945     glStencilMask(0xff); // Enable stencil writes
 946
 947     if (dirtyStencilRegion.intersects(currentScissorBounds)) {
 948         QVector<QRect> clearRegion = dirtyStencilRegion.intersected(currentScissorBounds).rects();
 949         glClearStencil(0); // Clear to zero
 950         for (int i = 0; i < clearRegion.size(); ++i) {
 951 #ifndef QT_GL_NO_SCISSOR_TEST
 952             setScissor(clearRegion.at(i));
 953 #endif
 954             glClear(GL_STENCIL_BUFFER_BIT);
 955         }
 956
 957         dirtyStencilRegion -= currentScissorBounds;
 958
 959 #ifndef QT_GL_NO_SCISSOR_TEST
 960         updateClipScissorTest();
 961 #endif
 962     }
 963
 964     glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); // Disable color writes
 965     useSimpleShader();
 966     glEnable(GL_STENCIL_TEST); // For some reason, this has to happen _after_ the simple shader is use()'d
 967
 968     if (mode == WindingFillMode) {
 969         Q_ASSERT(stops && !count);
 970         if (q->state()->clipTestEnabled) {
 971             // Flatten clip values higher than current clip, and set high bit to match current clip
 972             glStencilFunc(GL_LEQUAL, GL_STENCIL_HIGH_BIT | q->state()->currentClip, ~GL_STENCIL_HIGH_BIT);
 973             glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE);
 974             composite(bounds);
 975
 976             glStencilFunc(GL_EQUAL, GL_STENCIL_HIGH_BIT, GL_STENCIL_HIGH_BIT);
 977         } else if (!stencilClean) {
 978             // Clear stencil buffer within bounding rect
 979             glStencilFunc(GL_ALWAYS, 0, 0xff);
 980             glStencilOp(GL_ZERO, GL_ZERO, GL_ZERO);
 981             composite(bounds);
 982         }
 983
 984         // Inc. for front-facing triangle
 985         glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_INCR_WRAP, GL_INCR_WRAP);
 986         // Dec. for back-facing "holes"
 987         glStencilOpSeparate(GL_BACK, GL_KEEP, GL_DECR_WRAP, GL_DECR_WRAP);
 988         glStencilMask(~GL_STENCIL_HIGH_BIT);
 989         drawVertexArrays(data, stops, stopCount, GL_TRIANGLE_FAN);
 990
 991         if (q->state()->clipTestEnabled) {
 992             // Clear high bit of stencil outside of path
 993             glStencilFunc(GL_EQUAL, q->state()->currentClip, ~GL_STENCIL_HIGH_BIT);
 994             glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE);
 995             glStencilMask(GL_STENCIL_HIGH_BIT);
 996             composite(bounds);
 997         }
 998     } else if (mode == OddEvenFillMode) {
 999         glStencilMask(GL_STENCIL_HIGH_BIT);
1000         glStencilOp(GL_KEEP, GL_KEEP, GL_INVERT); // Simply invert the stencil bit
1001         drawVertexArrays(data, stops, stopCount, GL_TRIANGLE_FAN);
1002
1003     } else { // TriStripStrokeFillMode
1004         Q_ASSERT(count && !stops); // tristrips generated directly, so no vertexArray or stops
1005         glStencilMask(GL_STENCIL_HIGH_BIT);
1006 #if 0
1007         glStencilOp(GL_KEEP, GL_KEEP, GL_INVERT); // Simply invert the stencil bit
1008         setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, data);
1009         glDrawArrays(GL_TRIANGLE_STRIP, 0, count);
1010 #else
1011
1012         glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
1013         if (q->state()->clipTestEnabled) {
1014             glStencilFunc(GL_LEQUAL, q->state()->currentClip | GL_STENCIL_HIGH_BIT,
1015                           ~GL_STENCIL_HIGH_BIT);
1016         } else {
1017             glStencilFunc(GL_ALWAYS, GL_STENCIL_HIGH_BIT, 0xff);
1018         }
1019         setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, data);
1020         glDrawArrays(GL_TRIANGLE_STRIP, 0, count);
1021 #endif
1022     }
1023
1024     // Enable color writes & disable stencil writes
1025     glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
1026 }
1027
1028 /*
1029     If the maximum value in the stencil buffer is GL_STENCIL_HIGH_BIT - 1,
1030     restore the stencil buffer to a pristine state.  The current clip region
1031     is set to 1, and the rest to 0.
1032 */
1033 void QGL2PaintEngineExPrivate::resetClipIfNeeded()
1034 {
1035     if (maxClip != (GL_STENCIL_HIGH_BIT - 1))
1036         return;
1037
1038     Q_Q(QGL2PaintEngineEx);
1039
1040     useSimpleShader();
1041     glEnable(GL_STENCIL_TEST);
1042     glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
1043
1044     QRectF bounds = q->state()->matrix.inverted().mapRect(QRectF(0, 0, width, height));
1045     QGLRect rect(bounds.left(), bounds.top(), bounds.right(), bounds.bottom());
1046
1047     // Set high bit on clip region
1048     glStencilFunc(GL_LEQUAL, q->state()->currentClip, 0xff);
1049     glStencilOp(GL_KEEP, GL_INVERT, GL_INVERT);
1050     glStencilMask(GL_STENCIL_HIGH_BIT);
1051     composite(rect);
1052
1053     // Reset clipping to 1 and everything else to zero
1054     glStencilFunc(GL_NOTEQUAL, 0x01, GL_STENCIL_HIGH_BIT);
1055     glStencilOp(GL_ZERO, GL_REPLACE, GL_REPLACE);
1056     glStencilMask(0xff);
1057     composite(rect);
1058
1059     q->state()->currentClip = 1;
1060     q->state()->canRestoreClip = false;
1061
1062     maxClip = 1;
1063
1064     glStencilMask(0x0);
1065     glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
1066 }
1067
1068 bool QGL2PaintEngineExPrivate::prepareForDraw(bool srcPixelsAreOpaque)
1069 {
1070     if (brushTextureDirty && mode != ImageDrawingMode && mode != ImageArrayDrawingMode)
1071         updateBrushTexture();
1072
1073     if (compositionModeDirty)
1074         updateCompositionMode();
1075
1076     if (matrixDirty)
1077         updateMatrix();
1078
1079     const bool stateHasOpacity = q->state()->opacity < 0.99f;
1080     if (q->state()->composition_mode == QPainter::CompositionMode_Source
1081         || (q->state()->composition_mode == QPainter::CompositionMode_SourceOver
1082             && srcPixelsAreOpaque && !stateHasOpacity))
1083     {
1084         glDisable(GL_BLEND);
1085     } else {
1086         glEnable(GL_BLEND);
1087     }
1088
1089     QGLEngineShaderManager::OpacityMode opacityMode;
1090     if (mode == ImageArrayDrawingMode) {
1091         opacityMode = QGLEngineShaderManager::AttributeOpacity;
1092     } else {
1093         opacityMode = stateHasOpacity ? QGLEngineShaderManager::UniformOpacity
1094                                       : QGLEngineShaderManager::NoOpacity;
1095         if (stateHasOpacity && (mode != ImageDrawingMode)) {
1096             // Using a brush
1097             bool brushIsPattern = (currentBrush.style() >= Qt::Dense1Pattern) &&
1098                                   (currentBrush.style() <= Qt::DiagCrossPattern);
1099
1100             if ((currentBrush.style() == Qt::SolidPattern) || brushIsPattern)
1101                 opacityMode = QGLEngineShaderManager::NoOpacity; // Global opacity handled by srcPixel shader
1102         }
1103     }
1104     shaderManager->setOpacityMode(opacityMode);
1105
1106     bool changed = shaderManager->useCorrectShaderProg();
1107     // If the shader program needs changing, we change it and mark all uniforms as dirty
1108     if (changed) {
1109         // The shader program has changed so mark all uniforms as dirty:
1110         brushUniformsDirty = true;
1111         opacityUniformDirty = true;
1112         matrixUniformDirty = true;
1113     }
1114
1115     if (brushUniformsDirty && mode != ImageDrawingMode && mode != ImageArrayDrawingMode)
1116         updateBrushUniforms();
1117
1118     if (opacityMode == QGLEngineShaderManager::UniformOpacity && opacityUniformDirty) {
1119         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::GlobalOpacity), (GLfloat)q->state()->opacity);
1120         opacityUniformDirty = false;
1121     }
1122
1123     if (matrixUniformDirty && shaderManager->hasComplexGeometry()) {
1124         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::Matrix),
1125                                                          pmvMatrix);
1126         matrixUniformDirty = false;
1127     }
1128
1129     return changed;
1130 }
1131
1132 void QGL2PaintEngineExPrivate::composite(const QGLRect& boundingRect)
1133 {
1134     setCoords(staticVertexCoordinateArray, boundingRect);
1135     setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, staticVertexCoordinateArray);
1136     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
1137 }
1138
1139 // Draws the vertex array as a set of <vertexArrayStops.size()> triangle fans.
1140 void QGL2PaintEngineExPrivate::drawVertexArrays(const float *data, int *stops, int stopCount,
1141                                                 GLenum primitive)
1142 {
1143     // Now setup the pointer to the vertex array:
1144     setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, (GLfloat*)data);
1145
1146     int previousStop = 0;
1147     for (int i=0; i<stopCount; ++i) {
1148         int stop = stops[i];
1149 /*
1150         qDebug("Drawing triangle fan for vertecies %d -> %d:", previousStop, stop-1);
1151         for (int i=previousStop; i<stop; ++i)
1152             qDebug("   %02d: [%.2f, %.2f]", i, vertexArray.data()[i].x, vertexArray.data()[i].y);
1153 */
1154         glDrawArrays(primitive, previousStop, stop - previousStop);
1155         previousStop = stop;
1156     }
1157 }
1158
1159 /////////////////////////////////// Public Methods //////////////////////////////////////////
1160
1161 QGL2PaintEngineEx::QGL2PaintEngineEx()
1162     : QPaintEngineEx(*(new QGL2PaintEngineExPrivate(this)))
1163 {
1164 }
1165
1166 QGL2PaintEngineEx::~QGL2PaintEngineEx()
1167 {
1168 }
1169
1170 void QGL2PaintEngineEx::fill(const QVectorPath &path, const QBrush &brush)
1171 {
1172     Q_D(QGL2PaintEngineEx);
1173
1174     if (qbrush_style(brush) == Qt::NoBrush)
1175         return;
1176     ensureActive();
1177     d->setBrush(brush);
1178     d->fill(path);
1179 }
1180
1181 Q_GUI_EXPORT bool qt_scaleForTransform(const QTransform &transform, qreal *scale); // qtransform.cpp
1182
1183
1184 void QGL2PaintEngineEx::stroke(const QVectorPath &path, const QPen &pen)
1185 {
1186     Q_D(QGL2PaintEngineEx);
1187
1188     const QBrush &penBrush = qpen_brush(pen);
1189     if (qpen_style(pen) == Qt::NoPen || qbrush_style(penBrush) == Qt::NoBrush)
1190         return;
1191
1192     QOpenGL2PaintEngineState *s = state();
1193     if (pen.isCosmetic() && !qt_scaleForTransform(s->transform(), 0)) {
1194         // QTriangulatingStroker class is not meant to support cosmetically sheared strokes.
1195         QPaintEngineEx::stroke(path, pen);
1196         return;
1197     }
1198
1199     ensureActive();
1200     d->setBrush(penBrush);
1201     d->stroke(path, pen);
1202 }
1203
1204 void QGL2PaintEngineExPrivate::stroke(const QVectorPath &path, const QPen &pen)
1205 {
1206     const QOpenGL2PaintEngineState *s = q->state();
1207     if (snapToPixelGrid) {
1208         snapToPixelGrid = false;
1209         matrixDirty = true;
1210     }
1211
1212     const Qt::PenStyle penStyle = qpen_style(pen);
1213     const QBrush &penBrush = qpen_brush(pen);
1214     const bool opaque = penBrush.isOpaque() && s->opacity > 0.99;
1215
1216     transferMode(BrushDrawingMode);
1217
1218     // updateMatrix() is responsible for setting the inverse scale on
1219     // the strokers, so we need to call it here and not wait for
1220     // prepareForDraw() down below.
1221     updateMatrix();
1222
1223     QRectF clip = q->state()->matrix.inverted().mapRect(q->state()->clipEnabled
1224                                                         ? q->state()->rectangleClip
1225                                                         : QRectF(0, 0, width, height));
1226
1227     if (penStyle == Qt::SolidLine) {
1228         stroker.process(path, pen, clip);
1229
1230     } else { // Some sort of dash
1231         dasher.process(path, pen, clip);
1232
1233         QVectorPath dashStroke(dasher.points(),
1234                                dasher.elementCount(),
1235                                dasher.elementTypes());
1236         stroker.process(dashStroke, pen, clip);
1237     }
1238
1239     if (!stroker.vertexCount())
1240         return;
1241
1242     if (opaque) {
1243         prepareForDraw(opaque);
1244         setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, stroker.vertices());
1245         glDrawArrays(GL_TRIANGLE_STRIP, 0, stroker.vertexCount() / 2);
1246
1247 //         QBrush b(Qt::green);
1248 //         d->setBrush(&b);
1249 //         d->prepareForDraw(true);
1250 //         glDrawArrays(GL_LINE_STRIP, 0, d->stroker.vertexCount() / 2);
1251
1252     } else {
1253         qreal width = qpen_widthf(pen) / 2;
1254         if (width == 0)
1255             width = 0.5;
1256         qreal extra = pen.joinStyle() == Qt::MiterJoin
1257                       ? qMax(pen.miterLimit() * width, width)
1258                       : width;
1259
1260         if (pen.isCosmetic())
1261             extra = extra * inverseScale;
1262
1263         QRectF bounds = path.controlPointRect().adjusted(-extra, -extra, extra, extra);
1264
1265         fillStencilWithVertexArray(stroker.vertices(), stroker.vertexCount() / 2,
1266                                       0, 0, bounds, QGL2PaintEngineExPrivate::TriStripStrokeFillMode);
1267
1268         glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE);
1269
1270         // Pass when any bit is set, replace stencil value with 0
1271         glStencilFunc(GL_NOTEQUAL, 0, GL_STENCIL_HIGH_BIT);
1272         prepareForDraw(false);
1273
1274         // Stencil the brush onto the dest buffer
1275         composite(bounds);
1276
1277         glStencilMask(0);
1278
1279         updateClipScissorTest();
1280     }
1281 }
1282
1283 void QGL2PaintEngineEx::penChanged() { }
1284 void QGL2PaintEngineEx::brushChanged() { }
1285 void QGL2PaintEngineEx::brushOriginChanged() { }
1286
1287 void QGL2PaintEngineEx::opacityChanged()
1288 {
1289 //    qDebug("QGL2PaintEngineEx::opacityChanged()");
1290     Q_D(QGL2PaintEngineEx);
1291     state()->opacityChanged = true;
1292
1293     Q_ASSERT(d->shaderManager);
1294     d->brushUniformsDirty = true;
1295     d->opacityUniformDirty = true;
1296 }
1297
1298 void QGL2PaintEngineEx::compositionModeChanged()
1299 {
1300 //     qDebug("QGL2PaintEngineEx::compositionModeChanged()");
1301     Q_D(QGL2PaintEngineEx);
1302     state()->compositionModeChanged = true;
1303     d->compositionModeDirty = true;
1304 }
1305
1306 void QGL2PaintEngineEx::renderHintsChanged()
1307 {
1308     state()->renderHintsChanged = true;
1309
1310 #if !defined(QT_OPENGL_ES_2)
1311     if ((state()->renderHints & QPainter::Antialiasing)
1312         || (state()->renderHints & QPainter::HighQualityAntialiasing))
1313         glEnable(GL_MULTISAMPLE);
1314     else
1315         glDisable(GL_MULTISAMPLE);
1316 #endif
1317
1318     Q_D(QGL2PaintEngineEx);
1319     d->lastTextureUsed = GLuint(-1);
1320     d->brushTextureDirty = true;
1321 //    qDebug("QGL2PaintEngineEx::renderHintsChanged() not implemented!");
1322 }
1323
1324 void QGL2PaintEngineEx::transformChanged()
1325 {
1326     Q_D(QGL2PaintEngineEx);
1327     d->matrixDirty = true;
1328     state()->matrixChanged = true;
1329 }
1330
1331
1332 static const QRectF scaleRect(const QRectF &r, qreal sx, qreal sy)
1333 {
1334     return QRectF(r.x() * sx, r.y() * sy, r.width() * sx, r.height() * sy);
1335 }
1336
1337 void QGL2PaintEngineEx::drawPixmap(const QRectF& dest, const QPixmap & pixmap, const QRectF & src)
1338 {
1339     Q_D(QGL2PaintEngineEx);
1340     QGLContext *ctx = d->ctx;
1341
1342     int max_texture_size = ctx->d_func()->maxTextureSize();
1343     if (pixmap.width() > max_texture_size || pixmap.height() > max_texture_size) {
1344         QPixmap scaled = pixmap.scaled(max_texture_size, max_texture_size, Qt::KeepAspectRatio);
1345
1346         const qreal sx = scaled.width() / qreal(pixmap.width());
1347         const qreal sy = scaled.height() / qreal(pixmap.height());
1348
1349         drawPixmap(dest, scaled, scaleRect(src, sx, sy));
1350         return;
1351     }
1352
1353     ensureActive();
1354     d->transferMode(ImageDrawingMode);
1355
1356     QGLContext::BindOptions bindOptions = QGLContext::InternalBindOption|QGLContext::CanFlipNativePixmapBindOption;
1357 #ifdef QGL_USE_TEXTURE_POOL
1358     bindOptions |= QGLContext::TemporarilyCachedBindOption;
1359 #endif
1360
1361     glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
1362     QGLTexture *texture =
1363         ctx->d_func()->bindTexture(pixmap, GL_TEXTURE_2D, GL_RGBA, bindOptions);
1364
1365     GLfloat top = texture->options & QGLContext::InvertedYBindOption ? (pixmap.height() - src.top()) : src.top();
1366     GLfloat bottom = texture->options & QGLContext::InvertedYBindOption ? (pixmap.height() - src.bottom()) : src.bottom();
1367     QGLRect srcRect(src.left(), top, src.right(), bottom);
1368
1369     bool isBitmap = pixmap.isQBitmap();
1370     bool isOpaque = !isBitmap && !pixmap.hasAlpha();
1371
1372     d->updateTextureFilter(GL_TEXTURE_2D, GL_CLAMP_TO_EDGE,
1373                            state()->renderHints & QPainter::SmoothPixmapTransform, texture->id);
1374     d->drawTexture(dest, srcRect, pixmap.size(), isOpaque, isBitmap);
1375
1376     if (texture->options&QGLContext::TemporarilyCachedBindOption) {
1377         // pixmap was temporarily cached as a QImage texture by pooling system
1378         // and should be destroyed immediately
1379         QGLTextureCache::instance()->remove(ctx, texture->id);
1380     }
1381 }
1382
1383 void QGL2PaintEngineEx::drawImage(const QRectF& dest, const QImage& image, const QRectF& src,
1384                         Qt::ImageConversionFlags)
1385 {
1386     Q_D(QGL2PaintEngineEx);
1387     QGLContext *ctx = d->ctx;
1388
1389     int max_texture_size = ctx->d_func()->maxTextureSize();
1390     if (image.width() > max_texture_size || image.height() > max_texture_size) {
1391         QImage scaled = image.scaled(max_texture_size, max_texture_size, Qt::KeepAspectRatio);
1392
1393         const qreal sx = scaled.width() / qreal(image.width());
1394         const qreal sy = scaled.height() / qreal(image.height());
1395
1396         drawImage(dest, scaled, scaleRect(src, sx, sy));
1397         return;
1398     }
1399
1400     ensureActive();
1401     d->transferMode(ImageDrawingMode);
1402
1403     glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
1404
1405     QGLContext::BindOptions bindOptions = QGLContext::InternalBindOption;
1406 #ifdef QGL_USE_TEXTURE_POOL
1407     bindOptions |= QGLContext::TemporarilyCachedBindOption;
1408 #endif
1409
1410     QGLTexture *texture = ctx->d_func()->bindTexture(image, GL_TEXTURE_2D, GL_RGBA, bindOptions);
1411     GLuint id = texture->id;
1412
1413     d->updateTextureFilter(GL_TEXTURE_2D, GL_CLAMP_TO_EDGE,
1414                            state()->renderHints & QPainter::SmoothPixmapTransform, id);
1415     d->drawTexture(dest, src, image.size(), !image.hasAlphaChannel());
1416
1417     if (texture->options&QGLContext::TemporarilyCachedBindOption) {
1418         // image was temporarily cached by texture pooling system
1419         // and should be destroyed immediately
1420         QGLTextureCache::instance()->remove(ctx, texture->id);
1421     }
1422 }
1423
1424 void QGL2PaintEngineEx::drawStaticTextItem(QStaticTextItem *textItem)
1425 {
1426     Q_D(QGL2PaintEngineEx);
1427
1428     ensureActive();
1429
1430     QPainterState *s = state();
1431     float det = s->matrix.determinant();
1432
1433     // don't try to cache huge fonts or vastly transformed fonts
1434     QFontEngine *fontEngine = textItem->fontEngine();
1435     const qreal pixelSize = fontEngine->fontDef.pixelSize;
1436     if (shouldDrawCachedGlyphs(pixelSize, s->matrix) || det < 0.25f || det > 4.f) {
1437         QFontEngineGlyphCache::Type glyphType = fontEngine->glyphFormat >= 0
1438                                                 ? QFontEngineGlyphCache::Type(textItem->fontEngine()->glyphFormat)
1439                                                 : d->glyphCacheType;
1440         if (glyphType == QFontEngineGlyphCache::Raster_RGBMask) {
1441             if (d->device->alphaRequested() || s->matrix.type() > QTransform::TxTranslate
1442                 || (s->composition_mode != QPainter::CompositionMode_Source
1443                 && s->composition_mode != QPainter::CompositionMode_SourceOver))
1444             {
1445                 glyphType = QFontEngineGlyphCache::Raster_A8;
1446             }
1447         }
1448
1449         d->drawCachedGlyphs(glyphType, textItem);
1450     } else {
1451         QPaintEngineEx::drawStaticTextItem(textItem);
1452     }
1453 }
1454
1455 bool QGL2PaintEngineEx::drawTexture(const QRectF &dest, GLuint textureId, const QSize &size, const QRectF &src)
1456 {
1457     Q_D(QGL2PaintEngineEx);
1458     if (!d->shaderManager)
1459         return false;
1460
1461     ensureActive();
1462     d->transferMode(ImageDrawingMode);
1463
1464 #ifndef QT_OPENGL_ES_2
1465     QGLContext *ctx = d->ctx;
1466 #endif
1467     glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
1468     glBindTexture(GL_TEXTURE_2D, textureId);
1469
1470     QGLRect srcRect(src.left(), src.bottom(), src.right(), src.top());
1471
1472     d->updateTextureFilter(GL_TEXTURE_2D, GL_CLAMP_TO_EDGE,
1473                            state()->renderHints & QPainter::SmoothPixmapTransform, textureId);
1474     d->drawTexture(dest, srcRect, size, false);
1475     return true;
1476 }
1477
1478 void QGL2PaintEngineEx::drawTextItem(const QPointF &p, const QTextItem &textItem)
1479 {
1480     Q_D(QGL2PaintEngineEx);
1481
1482     ensureActive();
1483     QOpenGL2PaintEngineState *s = state();
1484
1485     const QTextItemInt &ti = static_cast<const QTextItemInt &>(textItem);
1486
1487     QTransform::TransformationType txtype = s->matrix.type();
1488
1489     float det = s->matrix.determinant();
1490     bool drawCached = txtype < QTransform::TxProject;
1491
1492     // don't try to cache huge fonts or vastly transformed fonts
1493     const qreal pixelSize = ti.fontEngine->fontDef.pixelSize;
1494     if (shouldDrawCachedGlyphs(pixelSize, s->matrix) || det < 0.25f || det > 4.f)
1495         drawCached = false;
1496
1497     QFontEngineGlyphCache::Type glyphType = ti.fontEngine->glyphFormat >= 0
1498                                             ? QFontEngineGlyphCache::Type(ti.fontEngine->glyphFormat)
1499                                             : d->glyphCacheType;
1500
1501
1502     if (glyphType == QFontEngineGlyphCache::Raster_RGBMask) {
1503         if (d->device->alphaRequested() || txtype > QTransform::TxTranslate
1504             || (state()->composition_mode != QPainter::CompositionMode_Source
1505             && state()->composition_mode != QPainter::CompositionMode_SourceOver))
1506         {
1507             glyphType = QFontEngineGlyphCache::Raster_A8;
1508         }
1509     }
1510
1511     if (drawCached) {
1512         QVarLengthArray<QFixedPoint> positions;
1513         QVarLengthArray<glyph_t> glyphs;
1514         QTransform matrix = QTransform::fromTranslate(p.x(), p.y());
1515         ti.fontEngine->getGlyphPositions(ti.glyphs, matrix, ti.flags, glyphs, positions);
1516
1517         {
1518             QStaticTextItem staticTextItem;
1519             staticTextItem.chars = const_cast<QChar *>(ti.chars);
1520             staticTextItem.setFontEngine(ti.fontEngine);
1521             staticTextItem.glyphs = glyphs.data();
1522             staticTextItem.numChars = ti.num_chars;
1523             staticTextItem.numGlyphs = glyphs.size();
1524             staticTextItem.glyphPositions = positions.data();
1525
1526             d->drawCachedGlyphs(glyphType, &staticTextItem);
1527         }
1528         return;
1529     }
1530
1531     QPaintEngineEx::drawTextItem(p, ti);
1532 }
1533
1534 namespace {
1535
1536     class QOpenGLStaticTextUserData: public QStaticTextUserData
1537     {
1538     public:
1539         QOpenGLStaticTextUserData()
1540             : QStaticTextUserData(OpenGLUserData), cacheSize(0, 0), cacheSerialNumber(0)
1541         {
1542         }
1543
1544         ~QOpenGLStaticTextUserData()
1545         {
1546         }
1547
1548         QSize cacheSize;
1549         QGL2PEXVertexArray vertexCoordinateArray;
1550         QGL2PEXVertexArray textureCoordinateArray;
1551         QFontEngineGlyphCache::Type glyphType;
1552         int cacheSerialNumber;
1553     };
1554
1555 }
1556
1557
1558 // #define QT_OPENGL_DRAWCACHEDGLYPHS_INDEX_ARRAY_VBO
1559
1560 void QGL2PaintEngineExPrivate::drawCachedGlyphs(QFontEngineGlyphCache::Type glyphType,
1561                                                 QStaticTextItem *staticTextItem)
1562 {
1563     Q_Q(QGL2PaintEngineEx);
1564
1565     QOpenGL2PaintEngineState *s = q->state();
1566
1567     void *cacheKey = const_cast<QGLContext *>(QGLContextPrivate::contextGroup(ctx)->context());
1568     bool recreateVertexArrays = false;
1569
1570     QGLTextureGlyphCache *cache =
1571             (QGLTextureGlyphCache *) staticTextItem->fontEngine()->glyphCache(cacheKey, glyphType, QTransform());
1572     if (!cache || cache->cacheType() != glyphType || cache->contextGroup() == 0) {
1573         cache = new QGLTextureGlyphCache(glyphType, QTransform());
1574         staticTextItem->fontEngine()->setGlyphCache(cacheKey, cache);
1575         recreateVertexArrays = true;
1576     }
1577
1578     if (staticTextItem->userDataNeedsUpdate) {
1579         recreateVertexArrays = true;
1580     } else if (staticTextItem->userData() == 0) {
1581         recreateVertexArrays = true;
1582     } else if (staticTextItem->userData()->type != QStaticTextUserData::OpenGLUserData) {
1583         recreateVertexArrays = true;
1584     } else {
1585         QOpenGLStaticTextUserData *userData = static_cast<QOpenGLStaticTextUserData *>(staticTextItem->userData());
1586         if (userData->glyphType != glyphType) {
1587             recreateVertexArrays = true;
1588         } else if (userData->cacheSerialNumber != cache->serialNumber()) {
1589             recreateVertexArrays = true;
1590         }
1591     }
1592
1593     // We only need to update the cache with new glyphs if we are actually going to recreate the vertex arrays.
1594     // If the cache size has changed, we do need to regenerate the vertices, but we don't need to repopulate the
1595     // cache so this text is performed before we test if the cache size has changed.
1596     if (recreateVertexArrays) {
1597         cache->setPaintEnginePrivate(this);
1598         if (!cache->populate(staticTextItem->fontEngine(), staticTextItem->numGlyphs,
1599                              staticTextItem->glyphs, staticTextItem->glyphPositions)) {
1600             // No space for glyphs in cache. We need to reset it and try again.
1601             cache->clear();
1602             cache->populate(staticTextItem->fontEngine(), staticTextItem->numGlyphs,
1603                             staticTextItem->glyphs, staticTextItem->glyphPositions);
1604         }
1605         cache->fillInPendingGlyphs();
1606     }
1607
1608     if (cache->width() == 0 || cache->height() == 0)
1609         return;
1610
1611     transferMode(TextDrawingMode);
1612
1613     int margin = cache->glyphMargin();
1614
1615     GLfloat dx = 1.0 / cache->width();
1616     GLfloat dy = 1.0 / cache->height();
1617
1618     // Use global arrays by default
1619     QGL2PEXVertexArray *vertexCoordinates = &vertexCoordinateArray;
1620     QGL2PEXVertexArray *textureCoordinates = &textureCoordinateArray;
1621
1622     if (staticTextItem->useBackendOptimizations) {
1623         QOpenGLStaticTextUserData *userData = 0;
1624
1625         if (staticTextItem->userData() == 0
1626             || staticTextItem->userData()->type != QStaticTextUserData::OpenGLUserData) {
1627
1628             userData = new QOpenGLStaticTextUserData();
1629             staticTextItem->setUserData(userData);
1630
1631         } else {
1632             userData = static_cast<QOpenGLStaticTextUserData*>(staticTextItem->userData());
1633         }
1634
1635         userData->glyphType = glyphType;
1636         userData->cacheSerialNumber = cache->serialNumber();
1637
1638         // Use cache if backend optimizations is turned on
1639         vertexCoordinates = &userData->vertexCoordinateArray;
1640         textureCoordinates = &userData->textureCoordinateArray;
1641
1642         QSize size(cache->width(), cache->height());
1643         if (userData->cacheSize != size) {
1644             recreateVertexArrays = true;
1645             userData->cacheSize = size;
1646         }
1647     }
1648
1649     if (recreateVertexArrays) {
1650         vertexCoordinates->clear();
1651         textureCoordinates->clear();
1652
1653         bool supportsSubPixelPositions = staticTextItem->fontEngine()->supportsSubPixelPositions();
1654         for (int i=0; i<staticTextItem->numGlyphs; ++i) {
1655             QFixed subPixelPosition;
1656             if (supportsSubPixelPositions)
1657                 subPixelPosition = staticTextItem->fontEngine()->subPixelPositionForX(staticTextItem->glyphPositions[i].x);
1658
1659             QTextureGlyphCache::GlyphAndSubPixelPosition glyph(staticTextItem->glyphs[i], subPixelPosition);
1660
1661             const QTextureGlyphCache::Coord &c = cache->coords[glyph];
1662             if (c.isNull())
1663                 continue;
1664
1665             int x = qFloor(staticTextItem->glyphPositions[i].x) + c.baseLineX - margin;
1666             int y = qFloor(staticTextItem->glyphPositions[i].y) - c.baseLineY - margin;
1667
1668             vertexCoordinates->addQuad(QRectF(x, y, c.w, c.h));
1669             textureCoordinates->addQuad(QRectF(c.x*dx, c.y*dy, c.w * dx, c.h * dy));
1670         }
1671
1672         staticTextItem->userDataNeedsUpdate = false;
1673     }
1674
1675     int numGlyphs = vertexCoordinates->vertexCount() / 4;
1676     if (numGlyphs == 0)
1677         return;
1678
1679     if (elementIndices.size() < numGlyphs*6) {
1680         Q_ASSERT(elementIndices.size() % 6 == 0);
1681         int j = elementIndices.size() / 6 * 4;
1682         while (j < numGlyphs*4) {
1683             elementIndices.append(j + 0);
1684             elementIndices.append(j + 0);
1685             elementIndices.append(j + 1);
1686             elementIndices.append(j + 2);
1687             elementIndices.append(j + 3);
1688             elementIndices.append(j + 3);
1689
1690             j += 4;
1691         }
1692
1693 #if defined(QT_OPENGL_DRAWCACHEDGLYPHS_INDEX_ARRAY_VBO)
1694         if (elementIndicesVBOId == 0)
1695             glGenBuffers(1, &elementIndicesVBOId);
1696
1697         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elementIndicesVBOId);
1698         glBufferData(GL_ELEMENT_ARRAY_BUFFER, elementIndices.size() * sizeof(GLushort),
1699                      elementIndices.constData(), GL_STATIC_DRAW);
1700 #endif
1701     } else {
1702 #if defined(QT_OPENGL_DRAWCACHEDGLYPHS_INDEX_ARRAY_VBO)
1703         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elementIndicesVBOId);
1704 #endif
1705     }
1706
1707     setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, (GLfloat*)vertexCoordinates->data());
1708     setVertexAttributePointer(QT_TEXTURE_COORDS_ATTR, (GLfloat*)textureCoordinates->data());
1709
1710     if (!snapToPixelGrid) {
1711         snapToPixelGrid = true;
1712         matrixDirty = true;
1713     }
1714
1715     QBrush pensBrush = q->state()->pen.brush();
1716     setBrush(pensBrush);
1717
1718     if (glyphType == QFontEngineGlyphCache::Raster_RGBMask) {
1719
1720         // Subpixel antialiasing without gamma correction
1721
1722         QPainter::CompositionMode compMode = q->state()->composition_mode;
1723         Q_ASSERT(compMode == QPainter::CompositionMode_Source
1724             || compMode == QPainter::CompositionMode_SourceOver);
1725
1726         shaderManager->setMaskType(QGLEngineShaderManager::SubPixelMaskPass1);
1727
1728         if (pensBrush.style() == Qt::SolidPattern) {
1729             // Solid patterns can get away with only one pass.
1730             QColor c = pensBrush.color();
1731             qreal oldOpacity = q->state()->opacity;
1732             if (compMode == QPainter::CompositionMode_Source) {
1733                 c = qt_premultiplyColor(c, q->state()->opacity);
1734                 q->state()->opacity = 1;
1735                 opacityUniformDirty = true;
1736             }
1737
1738             compositionModeDirty = false; // I can handle this myself, thank you very much
1739             prepareForDraw(false); // Text always causes src pixels to be transparent
1740
1741             // prepareForDraw() have set the opacity on the current shader, so the opacity state can now be reset.
1742             if (compMode == QPainter::CompositionMode_Source) {
1743                 q->state()->opacity = oldOpacity;
1744                 opacityUniformDirty = true;
1745             }
1746
1747             glEnable(GL_BLEND);
1748             glBlendFunc(GL_CONSTANT_COLOR, GL_ONE_MINUS_SRC_COLOR);
1749             glBlendColor(c.redF(), c.greenF(), c.blueF(), c.alphaF());
1750         } else {
1751             // Other brush styles need two passes.
1752
1753             qreal oldOpacity = q->state()->opacity;
1754             if (compMode == QPainter::CompositionMode_Source) {
1755                 q->state()->opacity = 1;
1756                 opacityUniformDirty = true;
1757                 pensBrush = Qt::white;
1758                 setBrush(pensBrush);
1759             }
1760
1761             compositionModeDirty = false; // I can handle this myself, thank you very much
1762             prepareForDraw(false); // Text always causes src pixels to be transparent
1763             glEnable(GL_BLEND);
1764             glBlendFunc(GL_ZERO, GL_ONE_MINUS_SRC_COLOR);
1765
1766             glActiveTexture(GL_TEXTURE0 + QT_MASK_TEXTURE_UNIT);
1767             glBindTexture(GL_TEXTURE_2D, cache->texture());
1768             updateTextureFilter(GL_TEXTURE_2D, GL_REPEAT, false);
1769
1770 #if defined(QT_OPENGL_DRAWCACHEDGLYPHS_INDEX_ARRAY_VBO)
1771             glDrawElements(GL_TRIANGLE_STRIP, 6 * numGlyphs, GL_UNSIGNED_SHORT, 0);
1772 #else
1773             glDrawElements(GL_TRIANGLE_STRIP, 6 * numGlyphs, GL_UNSIGNED_SHORT, elementIndices.data());
1774 #endif
1775
1776             shaderManager->setMaskType(QGLEngineShaderManager::SubPixelMaskPass2);
1777
1778             if (compMode == QPainter::CompositionMode_Source) {
1779                 q->state()->opacity = oldOpacity;
1780                 opacityUniformDirty = true;
1781                 pensBrush = q->state()->pen.brush();
1782                 setBrush(pensBrush);
1783             }
1784
1785             compositionModeDirty = false;
1786             prepareForDraw(false); // Text always causes src pixels to be transparent
1787             glEnable(GL_BLEND);
1788             glBlendFunc(GL_ONE, GL_ONE);
1789         }
1790         compositionModeDirty = true;
1791     } else {
1792         // Greyscale/mono glyphs
1793
1794         shaderManager->setMaskType(QGLEngineShaderManager::PixelMask);
1795         prepareForDraw(false); // Text always causes src pixels to be transparent
1796     }
1797
1798     QGLTextureGlyphCache::FilterMode filterMode = (s->matrix.type() > QTransform::TxTranslate)?QGLTextureGlyphCache::Linear:QGLTextureGlyphCache::Nearest;
1799     if (lastMaskTextureUsed != cache->texture() || cache->filterMode() != filterMode) {
1800
1801         glActiveTexture(GL_TEXTURE0 + QT_MASK_TEXTURE_UNIT);
1802         if (lastMaskTextureUsed != cache->texture()) {
1803             glBindTexture(GL_TEXTURE_2D, cache->texture());
1804             lastMaskTextureUsed = cache->texture();
1805         }
1806
1807         if (cache->filterMode() != filterMode) {
1808             if (filterMode == QGLTextureGlyphCache::Linear) {
1809                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
1810                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1811             } else {
1812                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
1813                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
1814             }
1815             cache->setFilterMode(filterMode);
1816         }
1817     }
1818
1819     bool srgbFrameBufferEnabled = false;
1820
1821 #if defined(QT_OPENGL_DRAWCACHEDGLYPHS_INDEX_ARRAY_VBO)
1822     glDrawElements(GL_TRIANGLE_STRIP, 6 * numGlyphs, GL_UNSIGNED_SHORT, 0);
1823     glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
1824 #else
1825     glDrawElements(GL_TRIANGLE_STRIP, 6 * numGlyphs, GL_UNSIGNED_SHORT, elementIndices.data());
1826 #endif
1827
1828     if (srgbFrameBufferEnabled)
1829         glDisable(FRAMEBUFFER_SRGB_EXT);
1830
1831 }
1832
1833 void QGL2PaintEngineEx::drawPixmapFragments(const QPainter::PixmapFragment *fragments, int fragmentCount, const QPixmap &pixmap,
1834                                             QPainter::PixmapFragmentHints hints)
1835 {
1836     Q_D(QGL2PaintEngineEx);
1837     // Use fallback for extended composition modes.
1838     if (state()->composition_mode > QPainter::CompositionMode_Plus) {
1839         QPaintEngineEx::drawPixmapFragments(fragments, fragmentCount, pixmap, hints);
1840         return;
1841     }
1842
1843     ensureActive();
1844     int max_texture_size = d->ctx->d_func()->maxTextureSize();
1845     if (pixmap.width() > max_texture_size || pixmap.height() > max_texture_size) {
1846         QPixmap scaled = pixmap.scaled(max_texture_size, max_texture_size, Qt::KeepAspectRatio);
1847         d->drawPixmapFragments(fragments, fragmentCount, scaled, hints);
1848     } else {
1849         d->drawPixmapFragments(fragments, fragmentCount, pixmap, hints);
1850     }
1851 }
1852
1853
1854 void QGL2PaintEngineExPrivate::drawPixmapFragments(const QPainter::PixmapFragment *fragments,
1855                                                    int fragmentCount, const QPixmap &pixmap,
1856                                                    QPainter::PixmapFragmentHints hints)
1857 {
1858     GLfloat dx = 1.0f / pixmap.size().width();
1859     GLfloat dy = 1.0f / pixmap.size().height();
1860
1861     vertexCoordinateArray.clear();
1862     textureCoordinateArray.clear();
1863     opacityArray.reset();
1864
1865     if (snapToPixelGrid) {
1866         snapToPixelGrid = false;
1867         matrixDirty = true;
1868     }
1869
1870     bool allOpaque = true;
1871
1872     for (int i = 0; i < fragmentCount; ++i) {
1873         qreal s = 0;
1874         qreal c = 1;
1875         if (fragments[i].rotation != 0) {
1876             s = qFastSin(fragments[i].rotation * Q_PI / 180);
1877             c = qFastCos(fragments[i].rotation * Q_PI / 180);
1878         }
1879
1880         qreal right = 0.5 * fragments[i].scaleX * fragments[i].width;
1881         qreal bottom = 0.5 * fragments[i].scaleY * fragments[i].height;
1882         QGLPoint bottomRight(right * c - bottom * s, right * s + bottom * c);
1883         QGLPoint bottomLeft(-right * c - bottom * s, -right * s + bottom * c);
1884
1885         vertexCoordinateArray.addVertex(bottomRight.x + fragments[i].x, bottomRight.y + fragments[i].y);
1886         vertexCoordinateArray.addVertex(-bottomLeft.x + fragments[i].x, -bottomLeft.y + fragments[i].y);
1887         vertexCoordinateArray.addVertex(-bottomRight.x + fragments[i].x, -bottomRight.y + fragments[i].y);
1888         vertexCoordinateArray.addVertex(-bottomRight.x + fragments[i].x, -bottomRight.y + fragments[i].y);
1889         vertexCoordinateArray.addVertex(bottomLeft.x + fragments[i].x, bottomLeft.y + fragments[i].y);
1890         vertexCoordinateArray.addVertex(bottomRight.x + fragments[i].x, bottomRight.y + fragments[i].y);
1891
1892         QGLRect src(fragments[i].sourceLeft * dx, fragments[i].sourceTop * dy,
1893                     (fragments[i].sourceLeft + fragments[i].width) * dx,
1894                     (fragments[i].sourceTop + fragments[i].height) * dy);
1895
1896         textureCoordinateArray.addVertex(src.right, src.bottom);
1897         textureCoordinateArray.addVertex(src.right, src.top);
1898         textureCoordinateArray.addVertex(src.left, src.top);
1899         textureCoordinateArray.addVertex(src.left, src.top);
1900         textureCoordinateArray.addVertex(src.left, src.bottom);
1901         textureCoordinateArray.addVertex(src.right, src.bottom);
1902
1903         qreal opacity = fragments[i].opacity * q->state()->opacity;
1904         opacityArray << opacity << opacity << opacity << opacity << opacity << opacity;
1905         allOpaque &= (opacity >= 0.99f);
1906     }
1907
1908     glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
1909     QGLTexture *texture = ctx->d_func()->bindTexture(pixmap, GL_TEXTURE_2D, GL_RGBA,
1910                                                      QGLContext::InternalBindOption
1911                                                      | QGLContext::CanFlipNativePixmapBindOption);
1912
1913     if (texture->options & QGLContext::InvertedYBindOption) {
1914         // Flip texture y-coordinate.
1915         QGLPoint *data = textureCoordinateArray.data();
1916         for (int i = 0; i < 6 * fragmentCount; ++i)
1917             data[i].y = 1 - data[i].y;
1918     }
1919
1920     transferMode(ImageArrayDrawingMode);
1921
1922     bool isBitmap = pixmap.isQBitmap();
1923     bool isOpaque = !isBitmap && (!pixmap.hasAlpha() || (hints & QPainter::OpaqueHint)) && allOpaque;
1924
1925     updateTextureFilter(GL_TEXTURE_2D, GL_CLAMP_TO_EDGE,
1926                            q->state()->renderHints & QPainter::SmoothPixmapTransform, texture->id);
1927
1928     // Setup for texture drawing
1929     currentBrush = noBrush;
1930     shaderManager->setSrcPixelType(isBitmap ? QGLEngineShaderManager::PatternSrc
1931                                             : QGLEngineShaderManager::ImageSrc);
1932     if (prepareForDraw(isOpaque))
1933         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::ImageTexture), QT_IMAGE_TEXTURE_UNIT);
1934
1935     if (isBitmap) {
1936         QColor col = qt_premultiplyColor(q->state()->pen.color(), (GLfloat)q->state()->opacity);
1937         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::PatternColor), col);
1938     }
1939
1940     glDrawArrays(GL_TRIANGLES, 0, 6 * fragmentCount);
1941 }
1942
1943 bool QGL2PaintEngineEx::begin(QPaintDevice *pdev)
1944 {
1945     Q_D(QGL2PaintEngineEx);
1946
1947 //     qDebug("QGL2PaintEngineEx::begin()");
1948     if (pdev->devType() == QInternal::OpenGL)
1949         d->device = static_cast<QGLPaintDevice*>(pdev);
1950     else
1951         d->device = QGLPaintDevice::getDevice(pdev);
1952
1953     if (!d->device)
1954         return false;
1955
1956     d->ctx = d->device->context();
1957     d->ctx->d_ptr->active_engine = this;
1958
1959     const QSize sz = d->device->size();
1960     d->width = sz.width();
1961     d->height = sz.height();
1962     d->mode = BrushDrawingMode;
1963     d->brushTextureDirty = true;
1964     d->brushUniformsDirty = true;
1965     d->matrixUniformDirty = true;
1966     d->matrixDirty = true;
1967     d->compositionModeDirty = true;
1968     d->opacityUniformDirty = true;
1969     d->needsSync = true;
1970     d->useSystemClip = !systemClip().isEmpty();
1971     d->currentBrush = QBrush();
1972
1973     d->dirtyStencilRegion = QRect(0, 0, d->width, d->height);
1974     d->stencilClean = true;
1975
1976     // Calling begin paint should make the correct context current. So, any
1977     // code which calls into GL or otherwise needs a current context *must*
1978     // go after beginPaint:
1979     d->device->beginPaint();
1980
1981 #if !defined(QT_OPENGL_ES_2)
1982     bool success = qt_resolve_version_2_0_functions(d->ctx)
1983                    && qt_resolve_buffer_extensions(d->ctx);
1984     Q_ASSERT(success);
1985     Q_UNUSED(success);
1986 #endif
1987
1988     d->shaderManager = new QGLEngineShaderManager(d->ctx);
1989
1990     glDisable(GL_STENCIL_TEST);
1991     glDisable(GL_DEPTH_TEST);
1992     glDisable(GL_SCISSOR_TEST);
1993
1994 #if !defined(QT_OPENGL_ES_2)
1995     glDisable(GL_MULTISAMPLE);
1996 #endif
1997
1998     d->glyphCacheType = QFontEngineGlyphCache::Raster_A8;
1999
2000 #if !defined(QT_OPENGL_ES_2)
2001         d->glyphCacheType = QFontEngineGlyphCache::Raster_RGBMask;
2002 #endif
2003
2004 #if defined(QT_OPENGL_ES_2)
2005     // OpenGL ES can't switch MSAA off, so if the gl paint device is
2006     // multisampled, it's always multisampled.
2007     d->multisamplingAlwaysEnabled = d->device->format().sampleBuffers();
2008 #else
2009     d->multisamplingAlwaysEnabled = false;
2010 #endif
2011
2012     return true;
2013 }
2014
2015 bool QGL2PaintEngineEx::end()
2016 {
2017     Q_D(QGL2PaintEngineEx);
2018
2019     QGLContext *ctx = d->ctx;
2020     glUseProgram(0);
2021     d->transferMode(BrushDrawingMode);
2022     d->device->endPaint();
2023
2024     ctx->d_ptr->active_engine = 0;
2025
2026     d->resetGLState();
2027
2028     delete d->shaderManager;
2029     d->shaderManager = 0;
2030     d->currentBrush = QBrush();
2031
2032 #ifdef QT_OPENGL_CACHE_AS_VBOS
2033     if (!d->unusedVBOSToClean.isEmpty()) {
2034         glDeleteBuffers(d->unusedVBOSToClean.size(), d->unusedVBOSToClean.constData());
2035         d->unusedVBOSToClean.clear();
2036     }
2037     if (!d->unusedIBOSToClean.isEmpty()) {
2038         glDeleteBuffers(d->unusedIBOSToClean.size(), d->unusedIBOSToClean.constData());
2039         d->unusedIBOSToClean.clear();
2040     }
2041 #endif
2042
2043     return false;
2044 }
2045
2046 void QGL2PaintEngineEx::ensureActive()
2047 {
2048     Q_D(QGL2PaintEngineEx);
2049     QGLContext *ctx = d->ctx;
2050
2051     if (isActive() && ctx->d_ptr->active_engine != this) {
2052         ctx->d_ptr->active_engine = this;
2053         d->needsSync = true;
2054     }
2055
2056     d->device->ensureActiveTarget();
2057
2058     if (d->needsSync) {
2059         d->transferMode(BrushDrawingMode);
2060         glViewport(0, 0, d->width, d->height);
2061         d->needsSync = false;
2062         d->lastMaskTextureUsed = 0;
2063         d->shaderManager->setDirty();
2064         d->ctx->d_func()->syncGlState();
2065         for (int i = 0; i < 3; ++i)
2066             d->vertexAttribPointers[i] = (GLfloat*)-1; // Assume the pointers are clobbered
2067         setState(state());
2068     }
2069 }
2070
2071 void QGL2PaintEngineExPrivate::updateClipScissorTest()
2072 {
2073     Q_Q(QGL2PaintEngineEx);
2074     if (q->state()->clipTestEnabled) {
2075         glEnable(GL_STENCIL_TEST);
2076         glStencilFunc(GL_LEQUAL, q->state()->currentClip, ~GL_STENCIL_HIGH_BIT);
2077     } else {
2078         glDisable(GL_STENCIL_TEST);
2079         glStencilFunc(GL_ALWAYS, 0, 0xff);
2080     }
2081
2082 #ifdef QT_GL_NO_SCISSOR_TEST
2083     currentScissorBounds = QRect(0, 0, width, height);
2084 #else
2085     QRect bounds = q->state()->rectangleClip;
2086     if (!q->state()->clipEnabled) {
2087         if (useSystemClip)
2088             bounds = systemClip.boundingRect();
2089         else
2090             bounds = QRect(0, 0, width, height);
2091     } else {
2092         if (useSystemClip)
2093             bounds = bounds.intersected(systemClip.boundingRect());
2094         else
2095             bounds = bounds.intersected(QRect(0, 0, width, height));
2096     }
2097
2098     currentScissorBounds = bounds;
2099
2100     if (bounds == QRect(0, 0, width, height)) {
2101         glDisable(GL_SCISSOR_TEST);
2102     } else {
2103         glEnable(GL_SCISSOR_TEST);
2104         setScissor(bounds);
2105     }
2106 #endif
2107 }
2108
2109 void QGL2PaintEngineExPrivate::setScissor(const QRect &rect)
2110 {
2111     const int left = rect.left();
2112     const int width = rect.width();
2113     int bottom = height - (rect.top() + rect.height());
2114     if (device->isFlipped()) {
2115         bottom = rect.top();
2116     }
2117     const int height = rect.height();
2118
2119     glScissor(left, bottom, width, height);
2120 }
2121
2122 void QGL2PaintEngineEx::clipEnabledChanged()
2123 {
2124     Q_D(QGL2PaintEngineEx);
2125
2126     state()->clipChanged = true;
2127
2128     if (painter()->hasClipping())
2129         d->regenerateClip();
2130     else
2131         d->systemStateChanged();
2132 }
2133
2134 void QGL2PaintEngineExPrivate::clearClip(uint value)
2135 {
2136     dirtyStencilRegion -= currentScissorBounds;
2137
2138     glStencilMask(0xff);
2139     glClearStencil(value);
2140     glClear(GL_STENCIL_BUFFER_BIT);
2141     glStencilMask(0x0);
2142
2143     q->state()->needsClipBufferClear = false;
2144 }
2145
2146 void QGL2PaintEngineExPrivate::writeClip(const QVectorPath &path, uint value)
2147 {
2148     transferMode(BrushDrawingMode);
2149
2150     if (snapToPixelGrid) {
2151         snapToPixelGrid = false;
2152         matrixDirty = true;
2153     }
2154
2155     if (matrixDirty)
2156         updateMatrix();
2157
2158     stencilClean = false;
2159
2160     const bool singlePass = !path.hasWindingFill()
2161         && (((q->state()->currentClip == maxClip - 1) && q->state()->clipTestEnabled)
2162             || q->state()->needsClipBufferClear);
2163     const uint referenceClipValue = q->state()->needsClipBufferClear ? 1 : q->state()->currentClip;
2164
2165     if (q->state()->needsClipBufferClear)
2166         clearClip(1);
2167
2168     if (path.isEmpty()) {
2169         glEnable(GL_STENCIL_TEST);
2170         glStencilFunc(GL_LEQUAL, value, ~GL_STENCIL_HIGH_BIT);
2171         return;
2172     }
2173
2174     if (q->state()->clipTestEnabled)
2175         glStencilFunc(GL_LEQUAL, q->state()->currentClip, ~GL_STENCIL_HIGH_BIT);
2176     else
2177         glStencilFunc(GL_ALWAYS, 0, 0xff);
2178
2179     vertexCoordinateArray.clear();
2180     vertexCoordinateArray.addPath(path, inverseScale, false);
2181
2182     if (!singlePass)
2183         fillStencilWithVertexArray(vertexCoordinateArray, path.hasWindingFill());
2184
2185     glColorMask(false, false, false, false);
2186     glEnable(GL_STENCIL_TEST);
2187     useSimpleShader();
2188
2189     if (singlePass) {
2190         // Under these conditions we can set the new stencil value in a single
2191         // pass, by using the current value and the "new value" as the toggles
2192
2193         glStencilFunc(GL_LEQUAL, referenceClipValue, ~GL_STENCIL_HIGH_BIT);
2194         glStencilOp(GL_KEEP, GL_INVERT, GL_INVERT);
2195         glStencilMask(value ^ referenceClipValue);
2196
2197         drawVertexArrays(vertexCoordinateArray, GL_TRIANGLE_FAN);
2198     } else {
2199         glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE);
2200         glStencilMask(0xff);
2201
2202         if (!q->state()->clipTestEnabled && path.hasWindingFill()) {
2203             // Pass when any clip bit is set, set high bit
2204             glStencilFunc(GL_NOTEQUAL, GL_STENCIL_HIGH_BIT, ~GL_STENCIL_HIGH_BIT);
2205             composite(vertexCoordinateArray.boundingRect());
2206         }
2207
2208         // Pass when high bit is set, replace stencil value with new clip value
2209         glStencilFunc(GL_NOTEQUAL, value, GL_STENCIL_HIGH_BIT);
2210
2211         composite(vertexCoordinateArray.boundingRect());
2212     }
2213
2214     glStencilFunc(GL_LEQUAL, value, ~GL_STENCIL_HIGH_BIT);
2215     glStencilMask(0);
2216
2217     glColorMask(true, true, true, true);
2218 }
2219
2220 void QGL2PaintEngineEx::clip(const QVectorPath &path, Qt::ClipOperation op)
2221 {
2222 //     qDebug("QGL2PaintEngineEx::clip()");
2223     Q_D(QGL2PaintEngineEx);
2224
2225     state()->clipChanged = true;
2226
2227     ensureActive();
2228
2229     if (op == Qt::ReplaceClip) {
2230         op = Qt::IntersectClip;
2231         if (d->hasClipOperations()) {
2232             d->systemStateChanged();
2233             state()->canRestoreClip = false;
2234         }
2235     }
2236
2237 #ifndef QT_GL_NO_SCISSOR_TEST
2238     if (!path.isEmpty() && op == Qt::IntersectClip && (path.shape() == QVectorPath::RectangleHint)) {
2239         const QPointF* const points = reinterpret_cast<const QPointF*>(path.points());
2240         QRectF rect(points[0], points[2]);
2241
2242         if (state()->matrix.type() <= QTransform::TxScale
2243             || (state()->matrix.type() == QTransform::TxRotate
2244                 && qFuzzyIsNull(state()->matrix.m11())
2245                 && qFuzzyIsNull(state()->matrix.m22())))
2246         {
2247             state()->rectangleClip = state()->rectangleClip.intersected(state()->matrix.mapRect(rect).toRect());
2248             d->updateClipScissorTest();
2249             return;
2250         }
2251     }
2252 #endif
2253
2254     const QRect pathRect = state()->matrix.mapRect(path.controlPointRect()).toAlignedRect();
2255
2256     switch (op) {
2257     case Qt::NoClip:
2258         if (d->useSystemClip) {
2259             state()->clipTestEnabled = true;
2260             state()->currentClip = 1;
2261         } else {
2262             state()->clipTestEnabled = false;
2263         }
2264         state()->rectangleClip = QRect(0, 0, d->width, d->height);
2265         state()->canRestoreClip = false;
2266         d->updateClipScissorTest();
2267         break;
2268     case Qt::IntersectClip:
2269         state()->rectangleClip = state()->rectangleClip.intersected(pathRect);
2270         d->updateClipScissorTest();
2271         d->resetClipIfNeeded();
2272         ++d->maxClip;
2273         d->writeClip(path, d->maxClip);
2274         state()->currentClip = d->maxClip;
2275         state()->clipTestEnabled = true;
2276         break;
2277     default:
2278         break;
2279     }
2280 }
2281
2282 void QGL2PaintEngineExPrivate::regenerateClip()
2283 {
2284     systemStateChanged();
2285     replayClipOperations();
2286 }
2287
2288 void QGL2PaintEngineExPrivate::systemStateChanged()
2289 {
2290     Q_Q(QGL2PaintEngineEx);
2291
2292     q->state()->clipChanged = true;
2293
2294     if (systemClip.isEmpty()) {
2295         useSystemClip = false;
2296     } else {
2297         if (q->paintDevice()->devType() == QInternal::Widget && currentClipDevice) {
2298             QWidgetPrivate *widgetPrivate = qt_widget_private(static_cast<QWidget *>(currentClipDevice)->window());
2299             useSystemClip = widgetPrivate->extra && widgetPrivate->extra->inRenderWithPainter;
2300         } else {
2301             useSystemClip = true;
2302         }
2303     }
2304
2305     q->state()->clipTestEnabled = false;
2306     q->state()->needsClipBufferClear = true;
2307
2308     q->state()->currentClip = 1;
2309     maxClip = 1;
2310
2311     q->state()->rectangleClip = useSystemClip ? systemClip.boundingRect() : QRect(0, 0, width, height);
2312     updateClipScissorTest();
2313
2314     if (systemClip.rectCount() == 1) {
2315         if (systemClip.boundingRect() == QRect(0, 0, width, height))
2316             useSystemClip = false;
2317 #ifndef QT_GL_NO_SCISSOR_TEST
2318         // scissoring takes care of the system clip
2319         return;
2320 #endif
2321     }
2322
2323     if (useSystemClip) {
2324         clearClip(0);
2325
2326         QPainterPath path;
2327         path.addRegion(systemClip);
2328
2329         q->state()->currentClip = 0;
2330         writeClip(qtVectorPathForPath(q->state()->matrix.inverted().map(path)), 1);
2331         q->state()->currentClip = 1;
2332         q->state()->clipTestEnabled = true;
2333     }
2334 }
2335
2336 void QGL2PaintEngineEx::setState(QPainterState *new_state)
2337 {
2338     //     qDebug("QGL2PaintEngineEx::setState()");
2339
2340     Q_D(QGL2PaintEngineEx);
2341
2342     QOpenGL2PaintEngineState *s = static_cast<QOpenGL2PaintEngineState *>(new_state);
2343     QOpenGL2PaintEngineState *old_state = state();
2344
2345     QPaintEngineEx::setState(s);
2346
2347     if (s->isNew) {
2348         // Newly created state object.  The call to setState()
2349         // will either be followed by a call to begin(), or we are
2350         // setting the state as part of a save().
2351         s->isNew = false;
2352         return;
2353     }
2354
2355     // Setting the state as part of a restore().
2356
2357     if (old_state == s || old_state->renderHintsChanged)
2358         renderHintsChanged();
2359
2360     if (old_state == s || old_state->matrixChanged)
2361         d->matrixDirty = true;
2362
2363     if (old_state == s || old_state->compositionModeChanged)
2364         d->compositionModeDirty = true;
2365
2366     if (old_state == s || old_state->opacityChanged)
2367         d->opacityUniformDirty = true;
2368
2369     if (old_state == s || old_state->clipChanged) {
2370         if (old_state && old_state != s && old_state->canRestoreClip) {
2371             d->updateClipScissorTest();
2372             glDepthFunc(GL_LEQUAL);
2373         } else {
2374             d->regenerateClip();
2375         }
2376     }
2377 }
2378
2379 QPainterState *QGL2PaintEngineEx::createState(QPainterState *orig) const
2380 {
2381     if (orig)
2382         const_cast<QGL2PaintEngineEx *>(this)->ensureActive();
2383
2384     QOpenGL2PaintEngineState *s;
2385     if (!orig)
2386         s = new QOpenGL2PaintEngineState();
2387     else
2388         s = new QOpenGL2PaintEngineState(*static_cast<QOpenGL2PaintEngineState *>(orig));
2389
2390     s->matrixChanged = false;
2391     s->compositionModeChanged = false;
2392     s->opacityChanged = false;
2393     s->renderHintsChanged = false;
2394     s->clipChanged = false;
2395
2396     return s;
2397 }
2398
2399 QOpenGL2PaintEngineState::QOpenGL2PaintEngineState(QOpenGL2PaintEngineState &other)
2400     : QPainterState(other)
2401 {
2402     isNew = true;
2403     needsClipBufferClear = other.needsClipBufferClear;
2404     clipTestEnabled = other.clipTestEnabled;
2405     currentClip = other.currentClip;
2406     canRestoreClip = other.canRestoreClip;
2407     rectangleClip = other.rectangleClip;
2408 }
2409
2410 QOpenGL2PaintEngineState::QOpenGL2PaintEngineState()
2411 {
2412     isNew = true;
2413     needsClipBufferClear = true;
2414     clipTestEnabled = false;
2415     canRestoreClip = true;
2416 }
2417
2418 QOpenGL2PaintEngineState::~QOpenGL2PaintEngineState()
2419 {
2420 }
2421
2422 QT_END_NAMESPACE