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 #if defined(Q_WS_WIN)
  93 extern Q_GUI_EXPORT bool qt_cleartype_enabled;
  94 #endif
  95
  96 #ifdef Q_WS_MAC
  97 extern bool qt_applefontsmoothing_enabled;
  98 #endif
  99
 100 Q_GUI_EXPORT QImage qt_imageForBrush(int brushStyle, bool invert);
 101
 102 ////////////////////////////////// Private Methods //////////////////////////////////////////
 103
 104 QGL2PaintEngineExPrivate::~QGL2PaintEngineExPrivate()
 105 {
 106     delete shaderManager;
 107
 108     while (pathCaches.size()) {
 109         QVectorPath::CacheEntry *e = *(pathCaches.constBegin());
 110         e->cleanup(e->engine, e->data);
 111         e->data = 0;
 112         e->engine = 0;
 113     }
 114
 115     if (elementIndicesVBOId != 0) {
 116         glDeleteBuffers(1, &elementIndicesVBOId);
 117         elementIndicesVBOId = 0;
 118     }
 119 }
 120
 121 void QGL2PaintEngineExPrivate::updateTextureFilter(GLenum target, GLenum wrapMode, bool smoothPixmapTransform, GLuint id)
 122 {
 123 //    glActiveTexture(GL_TEXTURE0 + QT_BRUSH_TEXTURE_UNIT); //### Is it always this texture unit?
 124     if (id != GLuint(-1) && id == lastTextureUsed)
 125         return;
 126
 127     lastTextureUsed = id;
 128
 129     if (smoothPixmapTransform) {
 130         glTexParameterf(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 131         glTexParameterf(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 132     } else {
 133         glTexParameterf(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 134         glTexParameterf(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 135     }
 136     glTexParameterf(target, GL_TEXTURE_WRAP_S, wrapMode);
 137     glTexParameterf(target, GL_TEXTURE_WRAP_T, wrapMode);
 138 }
 139
 140
 141 inline QColor qt_premultiplyColor(QColor c, GLfloat opacity)
 142 {
 143     qreal alpha = c.alphaF() * opacity;
 144     c.setAlphaF(alpha);
 145     c.setRedF(c.redF() * alpha);
 146     c.setGreenF(c.greenF() * alpha);
 147     c.setBlueF(c.blueF() * alpha);
 148     return c;
 149 }
 150
 151
 152 void QGL2PaintEngineExPrivate::setBrush(const QBrush& brush)
 153 {
 154     if (qbrush_fast_equals(currentBrush, brush))
 155         return;
 156
 157     const Qt::BrushStyle newStyle = qbrush_style(brush);
 158     Q_ASSERT(newStyle != Qt::NoBrush);
 159
 160     currentBrush = brush;
 161     if (!currentBrushPixmap.isNull())
 162         currentBrushPixmap = QPixmap();
 163     brushUniformsDirty = true; // All brushes have at least one uniform
 164
 165     if (newStyle > Qt::SolidPattern)
 166         brushTextureDirty = true;
 167
 168     if (currentBrush.style() == Qt::TexturePattern
 169         && qHasPixmapTexture(brush) && brush.texture().isQBitmap())
 170     {
 171         shaderManager->setSrcPixelType(QGLEngineShaderManager::TextureSrcWithPattern);
 172     } else {
 173         shaderManager->setSrcPixelType(newStyle);
 174     }
 175     shaderManager->optimiseForBrushTransform(currentBrush.transform().type());
 176 }
 177
 178
 179 void QGL2PaintEngineExPrivate::useSimpleShader()
 180 {
 181     shaderManager->useSimpleProgram();
 182
 183     if (matrixDirty)
 184         updateMatrix();
 185 }
 186
 187 void QGL2PaintEngineExPrivate::updateBrushTexture()
 188 {
 189     Q_Q(QGL2PaintEngineEx);
 190 //     qDebug("QGL2PaintEngineExPrivate::updateBrushTexture()");
 191     Qt::BrushStyle style = currentBrush.style();
 192
 193     if ( (style >= Qt::Dense1Pattern) && (style <= Qt::DiagCrossPattern) ) {
 194         // Get the image data for the pattern
 195         QImage texImage = qt_imageForBrush(style, false);
 196
 197         glActiveTexture(GL_TEXTURE0 + QT_BRUSH_TEXTURE_UNIT);
 198         ctx->d_func()->bindTexture(texImage, GL_TEXTURE_2D, GL_RGBA, QGLContext::InternalBindOption);
 199         updateTextureFilter(GL_TEXTURE_2D, GL_REPEAT, q->state()->renderHints & QPainter::SmoothPixmapTransform);
 200     }
 201     else if (style >= Qt::LinearGradientPattern && style <= Qt::ConicalGradientPattern) {
 202         // Gradiant brush: All the gradiants use the same texture
 203
 204         const QGradient* g = currentBrush.gradient();
 205
 206         // We apply global opacity in the fragment shaders, so we always pass 1.0
 207         // for opacity to the cache.
 208         GLuint texId = QGL2GradientCache::cacheForContext(ctx)->getBuffer(*g, 1.0);
 209
 210         glActiveTexture(GL_TEXTURE0 + QT_BRUSH_TEXTURE_UNIT);
 211         glBindTexture(GL_TEXTURE_2D, texId);
 212
 213         if (g->spread() == QGradient::RepeatSpread || g->type() == QGradient::ConicalGradient)
 214             updateTextureFilter(GL_TEXTURE_2D, GL_REPEAT, q->state()->renderHints & QPainter::SmoothPixmapTransform);
 215         else if (g->spread() == QGradient::ReflectSpread)
 216             updateTextureFilter(GL_TEXTURE_2D, GL_MIRRORED_REPEAT_IBM, q->state()->renderHints & QPainter::SmoothPixmapTransform);
 217         else
 218             updateTextureFilter(GL_TEXTURE_2D, GL_CLAMP_TO_EDGE, q->state()->renderHints & QPainter::SmoothPixmapTransform);
 219     }
 220     else if (style == Qt::TexturePattern) {
 221         currentBrushPixmap = currentBrush.texture();
 222
 223         int max_texture_size = ctx->d_func()->maxTextureSize();
 224         if (currentBrushPixmap.width() > max_texture_size || currentBrushPixmap.height() > max_texture_size)
 225             currentBrushPixmap = currentBrushPixmap.scaled(max_texture_size, max_texture_size, Qt::KeepAspectRatio);
 226
 227         glActiveTexture(GL_TEXTURE0 + QT_BRUSH_TEXTURE_UNIT);
 228         QGLTexture *tex = ctx->d_func()->bindTexture(currentBrushPixmap, GL_TEXTURE_2D, GL_RGBA,
 229                                                      QGLContext::InternalBindOption |
 230                                                      QGLContext::CanFlipNativePixmapBindOption);
 231         updateTextureFilter(GL_TEXTURE_2D, GL_REPEAT, q->state()->renderHints & QPainter::SmoothPixmapTransform);
 232         textureInvertedY = tex->options & QGLContext::InvertedYBindOption ? -1 : 1;
 233     }
 234     brushTextureDirty = false;
 235 }
 236
 237
 238 void QGL2PaintEngineExPrivate::updateBrushUniforms()
 239 {
 240 //     qDebug("QGL2PaintEngineExPrivate::updateBrushUniforms()");
 241     Qt::BrushStyle style = currentBrush.style();
 242
 243     if (style == Qt::NoBrush)
 244         return;
 245
 246     QTransform brushQTransform = currentBrush.transform();
 247
 248     if (style == Qt::SolidPattern) {
 249         QColor col = qt_premultiplyColor(currentBrush.color(), (GLfloat)q->state()->opacity);
 250         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::FragmentColor), col);
 251     }
 252     else {
 253         // All other brushes have a transform and thus need the translation point:
 254         QPointF translationPoint;
 255
 256         if (style <= Qt::DiagCrossPattern) {
 257             QColor col = qt_premultiplyColor(currentBrush.color(), (GLfloat)q->state()->opacity);
 258
 259             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::PatternColor), col);
 260
 261             QVector2D halfViewportSize(width*0.5, height*0.5);
 262             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::HalfViewportSize), halfViewportSize);
 263         }
 264         else if (style == Qt::LinearGradientPattern) {
 265             const QLinearGradient *g = static_cast<const QLinearGradient *>(currentBrush.gradient());
 266
 267             QPointF realStart = g->start();
 268             QPointF realFinal = g->finalStop();
 269             translationPoint = realStart;
 270
 271             QPointF l = realFinal - realStart;
 272
 273             QVector3D linearData(
 274                 l.x(),
 275                 l.y(),
 276                 1.0f / (l.x() * l.x() + l.y() * l.y())
 277             );
 278
 279             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::LinearData), linearData);
 280
 281             QVector2D halfViewportSize(width*0.5, height*0.5);
 282             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::HalfViewportSize), halfViewportSize);
 283         }
 284         else if (style == Qt::ConicalGradientPattern) {
 285             const QConicalGradient *g = static_cast<const QConicalGradient *>(currentBrush.gradient());
 286             translationPoint   = g->center();
 287
 288             GLfloat angle = -(g->angle() * 2 * Q_PI) / 360.0;
 289
 290             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::Angle), angle);
 291
 292             QVector2D halfViewportSize(width*0.5, height*0.5);
 293             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::HalfViewportSize), halfViewportSize);
 294         }
 295         else if (style == Qt::RadialGradientPattern) {
 296             const QRadialGradient *g = static_cast<const QRadialGradient *>(currentBrush.gradient());
 297             QPointF realCenter = g->center();
 298             QPointF realFocal  = g->focalPoint();
 299             qreal   realRadius = g->centerRadius() - g->focalRadius();
 300             translationPoint   = realFocal;
 301
 302             QPointF fmp = realCenter - realFocal;
 303             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::Fmp), fmp);
 304
 305             GLfloat fmp2_m_radius2 = -fmp.x() * fmp.x() - fmp.y() * fmp.y() + realRadius*realRadius;
 306             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::Fmp2MRadius2), fmp2_m_radius2);
 307             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::Inverse2Fmp2MRadius2),
 308                                                              GLfloat(1.0 / (2.0*fmp2_m_radius2)));
 309             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::SqrFr),
 310                                                              GLfloat(g->focalRadius() * g->focalRadius()));
 311             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::BRadius),
 312                                                              GLfloat(2 * (g->centerRadius() - g->focalRadius()) * g->focalRadius()),
 313                                                              g->focalRadius(),
 314                                                              g->centerRadius() - g->focalRadius());
 315
 316             QVector2D halfViewportSize(width*0.5, height*0.5);
 317             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::HalfViewportSize), halfViewportSize);
 318         }
 319         else if (style == Qt::TexturePattern) {
 320             const QPixmap& texPixmap = currentBrush.texture();
 321
 322             if (qHasPixmapTexture(currentBrush) && currentBrush.texture().isQBitmap()) {
 323                 QColor col = qt_premultiplyColor(currentBrush.color(), (GLfloat)q->state()->opacity);
 324                 shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::PatternColor), col);
 325             }
 326
 327             QSizeF invertedTextureSize(1.0 / texPixmap.width(), 1.0 / texPixmap.height());
 328             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::InvertedTextureSize), invertedTextureSize);
 329
 330             QVector2D halfViewportSize(width*0.5, height*0.5);
 331             shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::HalfViewportSize), halfViewportSize);
 332         }
 333         else
 334             qWarning("QGL2PaintEngineEx: Unimplemented fill style");
 335
 336         const QPointF &brushOrigin = q->state()->brushOrigin;
 337         QTransform matrix = q->state()->matrix;
 338         matrix.translate(brushOrigin.x(), brushOrigin.y());
 339
 340         QTransform translate(1, 0, 0, 1, -translationPoint.x(), -translationPoint.y());
 341         qreal m22 = -1;
 342         qreal dy = height;
 343         if (device->isFlipped()) {
 344             m22 = 1;
 345             dy = 0;
 346         }
 347         QTransform gl_to_qt(1, 0, 0, m22, 0, dy);
 348         QTransform inv_matrix;
 349         if (style == Qt::TexturePattern && textureInvertedY == -1)
 350             inv_matrix = gl_to_qt * (QTransform(1, 0, 0, -1, 0, currentBrush.texture().height()) * brushQTransform * matrix).inverted() * translate;
 351         else
 352             inv_matrix = gl_to_qt * (brushQTransform * matrix).inverted() * translate;
 353
 354         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::BrushTransform), inv_matrix);
 355         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::BrushTexture), QT_BRUSH_TEXTURE_UNIT);
 356     }
 357     brushUniformsDirty = false;
 358 }
 359
 360
 361 // This assumes the shader manager has already setup the correct shader program
 362 void QGL2PaintEngineExPrivate::updateMatrix()
 363 {
 364 //     qDebug("QGL2PaintEngineExPrivate::updateMatrix()");
 365
 366     const QTransform& transform = q->state()->matrix;
 367
 368     // The projection matrix converts from Qt's coordinate system to GL's coordinate system
 369     //    * GL's viewport is 2x2, Qt's is width x height
 370     //    * GL has +y -> -y going from bottom -> top, Qt is the other way round
 371     //    * GL has [0,0] in the center, Qt has it in the top-left
 372     //
 373     // This results in the Projection matrix below, which is multiplied by the painter's
 374     // transformation matrix, as shown below:
 375     //
 376     //                Projection Matrix                      Painter Transform
 377     // ------------------------------------------------   ------------------------
 378     // | 2.0 / width  |      0.0      |     -1.0      |   |  m11  |  m21  |  dx  |
 379     // |     0.0      | -2.0 / height |      1.0      | * |  m12  |  m22  |  dy  |
 380     // |     0.0      |      0.0      |      1.0      |   |  m13  |  m23  |  m33 |
 381     // ------------------------------------------------   ------------------------
 382     //
 383     // NOTE: The resultant matrix is also transposed, as GL expects column-major matracies
 384
 385     const GLfloat wfactor = 2.0f / width;
 386     GLfloat hfactor = -2.0f / height;
 387
 388     GLfloat dx = transform.dx();
 389     GLfloat dy = transform.dy();
 390
 391     if (device->isFlipped()) {
 392         hfactor *= -1;
 393         dy -= height;
 394     }
 395
 396     // Non-integer translates can have strange effects for some rendering operations such as
 397     // anti-aliased text rendering. In such cases, we snap the translate to the pixel grid.
 398     if (snapToPixelGrid && transform.type() == QTransform::TxTranslate) {
 399         // 0.50 needs to rounded down to 0.0 for consistency with raster engine:
 400         dx = ceilf(dx - 0.5f);
 401         dy = ceilf(dy - 0.5f);
 402     }
 403     pmvMatrix[0][0] = (wfactor * transform.m11())  - transform.m13();
 404     pmvMatrix[1][0] = (wfactor * transform.m21())  - transform.m23();
 405     pmvMatrix[2][0] = (wfactor * dx) - transform.m33();
 406     pmvMatrix[0][1] = (hfactor * transform.m12())  + transform.m13();
 407     pmvMatrix[1][1] = (hfactor * transform.m22())  + transform.m23();
 408     pmvMatrix[2][1] = (hfactor * dy) + transform.m33();
 409     pmvMatrix[0][2] = transform.m13();
 410     pmvMatrix[1][2] = transform.m23();
 411     pmvMatrix[2][2] = transform.m33();
 412
 413     // 1/10000 == 0.0001, so we have good enough res to cover curves
 414     // that span the entire widget...
 415     inverseScale = qMax(1 / qMax( qMax(qAbs(transform.m11()), qAbs(transform.m22())),
 416                                   qMax(qAbs(transform.m12()), qAbs(transform.m21())) ),
 417                         qreal(0.0001));
 418
 419     matrixDirty = false;
 420     matrixUniformDirty = true;
 421
 422     // Set the PMV matrix attribute. As we use an attributes rather than uniforms, we only
 423     // need to do this once for every matrix change and persists across all shader programs.
 424     glVertexAttrib3fv(QT_PMV_MATRIX_1_ATTR, pmvMatrix[0]);
 425     glVertexAttrib3fv(QT_PMV_MATRIX_2_ATTR, pmvMatrix[1]);
 426     glVertexAttrib3fv(QT_PMV_MATRIX_3_ATTR, pmvMatrix[2]);
 427
 428     dasher.setInvScale(inverseScale);
 429     stroker.setInvScale(inverseScale);
 430 }
 431
 432
 433 void QGL2PaintEngineExPrivate::updateCompositionMode()
 434 {
 435     // NOTE: The entire paint engine works on pre-multiplied data - which is why some of these
 436     //       composition modes look odd.
 437 //     qDebug() << "QGL2PaintEngineExPrivate::updateCompositionMode() - Setting GL composition mode for " << q->state()->composition_mode;
 438     switch(q->state()->composition_mode) {
 439     case QPainter::CompositionMode_SourceOver:
 440         glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
 441         break;
 442     case QPainter::CompositionMode_DestinationOver:
 443         glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_ONE);
 444         break;
 445     case QPainter::CompositionMode_Clear:
 446         glBlendFunc(GL_ZERO, GL_ZERO);
 447         break;
 448     case QPainter::CompositionMode_Source:
 449         glBlendFunc(GL_ONE, GL_ZERO);
 450         break;
 451     case QPainter::CompositionMode_Destination:
 452         glBlendFunc(GL_ZERO, GL_ONE);
 453         break;
 454     case QPainter::CompositionMode_SourceIn:
 455         glBlendFunc(GL_DST_ALPHA, GL_ZERO);
 456         break;
 457     case QPainter::CompositionMode_DestinationIn:
 458         glBlendFunc(GL_ZERO, GL_SRC_ALPHA);
 459         break;
 460     case QPainter::CompositionMode_SourceOut:
 461         glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_ZERO);
 462         break;
 463     case QPainter::CompositionMode_DestinationOut:
 464         glBlendFunc(GL_ZERO, GL_ONE_MINUS_SRC_ALPHA);
 465         break;
 466     case QPainter::CompositionMode_SourceAtop:
 467         glBlendFunc(GL_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 468         break;
 469     case QPainter::CompositionMode_DestinationAtop:
 470         glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_SRC_ALPHA);
 471         break;
 472     case QPainter::CompositionMode_Xor:
 473         glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 474         break;
 475     case QPainter::CompositionMode_Plus:
 476         glBlendFunc(GL_ONE, GL_ONE);
 477         break;
 478     default:
 479         qWarning("Unsupported composition mode");
 480         break;
 481     }
 482
 483     compositionModeDirty = false;
 484 }
 485
 486 static inline void setCoords(GLfloat *coords, const QGLRect &rect)
 487 {
 488     coords[0] = rect.left;
 489     coords[1] = rect.top;
 490     coords[2] = rect.right;
 491     coords[3] = rect.top;
 492     coords[4] = rect.right;
 493     coords[5] = rect.bottom;
 494     coords[6] = rect.left;
 495     coords[7] = rect.bottom;
 496 }
 497
 498 void QGL2PaintEngineExPrivate::drawTexture(const QGLRect& dest, const QGLRect& src, const QSize &textureSize, bool opaque, bool pattern)
 499 {
 500     // Setup for texture drawing
 501     currentBrush = noBrush;
 502     shaderManager->setSrcPixelType(pattern ? QGLEngineShaderManager::PatternSrc : QGLEngineShaderManager::ImageSrc);
 503
 504     if (snapToPixelGrid) {
 505         snapToPixelGrid = false;
 506         matrixDirty = true;
 507     }
 508
 509     if (prepareForDraw(opaque))
 510         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::ImageTexture), QT_IMAGE_TEXTURE_UNIT);
 511
 512     if (pattern) {
 513         QColor col = qt_premultiplyColor(q->state()->pen.color(), (GLfloat)q->state()->opacity);
 514         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::PatternColor), col);
 515     }
 516
 517     GLfloat dx = 1.0 / textureSize.width();
 518     GLfloat dy = 1.0 / textureSize.height();
 519
 520     QGLRect srcTextureRect(src.left*dx, src.top*dy, src.right*dx, src.bottom*dy);
 521
 522     setCoords(staticVertexCoordinateArray, dest);
 523     setCoords(staticTextureCoordinateArray, srcTextureRect);
 524
 525     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 526 }
 527
 528 void QGL2PaintEngineEx::beginNativePainting()
 529 {
 530     Q_D(QGL2PaintEngineEx);
 531     ensureActive();
 532     d->transferMode(BrushDrawingMode);
 533
 534     d->nativePaintingActive = true;
 535
 536     QGLContext *ctx = d->ctx;
 537     glUseProgram(0);
 538
 539     // Disable all the vertex attribute arrays:
 540     for (int i = 0; i < QT_GL_VERTEX_ARRAY_TRACKED_COUNT; ++i)
 541         glDisableVertexAttribArray(i);
 542
 543 #ifndef QT_OPENGL_ES_2
 544     const QGLFormat &fmt = d->device->format();
 545     if (fmt.majorVersion() < 3 || (fmt.majorVersion() == 3 && fmt.minorVersion() < 1)
 546         || fmt.profile() == QGLFormat::CompatibilityProfile)
 547     {
 548         // be nice to people who mix OpenGL 1.x code with QPainter commands
 549         // by setting modelview and projection matrices to mirror the GL 1
 550         // paint engine
 551         const QTransform& mtx = state()->matrix;
 552
 553         float mv_matrix[4][4] =
 554         {
 555             { float(mtx.m11()), float(mtx.m12()),     0, float(mtx.m13()) },
 556             { float(mtx.m21()), float(mtx.m22()),     0, float(mtx.m23()) },
 557             {                0,                0,     1,                0 },
 558             {  float(mtx.dx()),  float(mtx.dy()),     0, float(mtx.m33()) }
 559         };
 560
 561         const QSize sz = d->device->size();
 562
 563         glMatrixMode(GL_PROJECTION);
 564         glLoadIdentity();
 565         glOrtho(0, sz.width(), sz.height(), 0, -999999, 999999);
 566
 567         glMatrixMode(GL_MODELVIEW);
 568         glLoadMatrixf(&mv_matrix[0][0]);
 569     }
 570 #else
 571     Q_UNUSED(ctx);
 572 #endif
 573
 574     d->lastTextureUsed = GLuint(-1);
 575     d->dirtyStencilRegion = QRect(0, 0, d->width, d->height);
 576     d->resetGLState();
 577
 578     d->shaderManager->setDirty();
 579
 580     d->needsSync = true;
 581 }
 582
 583 void QGL2PaintEngineExPrivate::resetGLState()
 584 {
 585     glDisable(GL_BLEND);
 586     glActiveTexture(GL_TEXTURE0);
 587     glDisable(GL_STENCIL_TEST);
 588     glDisable(GL_DEPTH_TEST);
 589     glDisable(GL_SCISSOR_TEST);
 590     glDepthMask(true);
 591     glDepthFunc(GL_LESS);
 592     glClearDepth(1);
 593     glStencilMask(0xff);
 594     glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
 595     glStencilFunc(GL_ALWAYS, 0, 0xff);
 596     ctx->d_func()->setVertexAttribArrayEnabled(QT_TEXTURE_COORDS_ATTR, false);
 597     ctx->d_func()->setVertexAttribArrayEnabled(QT_VERTEX_COORDS_ATTR, false);
 598     ctx->d_func()->setVertexAttribArrayEnabled(QT_OPACITY_ATTR, false);
 599 #ifndef QT_OPENGL_ES_2
 600     // gl_Color, corresponding to vertex attribute 3, may have been changed
 601     float color[] = { 1.0f, 1.0f, 1.0f, 1.0f };
 602     glVertexAttrib4fv(3, color);
 603 #endif
 604 }
 605
 606 void QGL2PaintEngineEx::endNativePainting()
 607 {
 608     Q_D(QGL2PaintEngineEx);
 609     d->needsSync = true;
 610     d->nativePaintingActive = false;
 611 }
 612
 613 void QGL2PaintEngineEx::invalidateState()
 614 {
 615     Q_D(QGL2PaintEngineEx);
 616     d->needsSync = true;
 617 }
 618
 619 bool QGL2PaintEngineEx::isNativePaintingActive() const {
 620     Q_D(const QGL2PaintEngineEx);
 621     return d->nativePaintingActive;
 622 }
 623
 624 void QGL2PaintEngineExPrivate::transferMode(EngineMode newMode)
 625 {
 626     if (newMode == mode)
 627         return;
 628
 629     if (mode == TextDrawingMode || mode == ImageDrawingMode || mode == ImageArrayDrawingMode) {
 630         lastTextureUsed = GLuint(-1);
 631     }
 632
 633     if (newMode == TextDrawingMode) {
 634         shaderManager->setHasComplexGeometry(true);
 635     } else {
 636         shaderManager->setHasComplexGeometry(false);
 637     }
 638
 639     if (newMode == ImageDrawingMode) {
 640         setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, staticVertexCoordinateArray);
 641         setVertexAttributePointer(QT_TEXTURE_COORDS_ATTR, staticTextureCoordinateArray);
 642     }
 643
 644     if (newMode == ImageArrayDrawingMode) {
 645         setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, (GLfloat*)vertexCoordinateArray.data());
 646         setVertexAttributePointer(QT_TEXTURE_COORDS_ATTR, (GLfloat*)textureCoordinateArray.data());
 647         setVertexAttributePointer(QT_OPACITY_ATTR, (GLfloat*)opacityArray.data());
 648     }
 649
 650     // This needs to change when we implement high-quality anti-aliasing...
 651     if (newMode != TextDrawingMode)
 652         shaderManager->setMaskType(QGLEngineShaderManager::NoMask);
 653
 654     mode = newMode;
 655 }
 656
 657 struct QGL2PEVectorPathCache
 658 {
 659 #ifdef QT_OPENGL_CACHE_AS_VBOS
 660     GLuint vbo;
 661     GLuint ibo;
 662 #else
 663     float *vertices;
 664     void *indices;
 665 #endif
 666     int vertexCount;
 667     int indexCount;
 668     GLenum primitiveType;
 669     qreal iscale;
 670     QVertexIndexVector::Type indexType;
 671 };
 672
 673 void QGL2PaintEngineExPrivate::cleanupVectorPath(QPaintEngineEx *engine, void *data)
 674 {
 675     QGL2PEVectorPathCache *c = (QGL2PEVectorPathCache *) data;
 676 #ifdef QT_OPENGL_CACHE_AS_VBOS
 677     Q_ASSERT(engine->type() == QPaintEngine::OpenGL2);
 678     static_cast<QGL2PaintEngineEx *>(engine)->d_func()->unusedVBOSToClean << c->vbo;
 679     if (c->ibo)
 680         d->unusedIBOSToClean << c->ibo;
 681 #else
 682     Q_UNUSED(engine);
 683     qFree(c->vertices);
 684     qFree(c->indices);
 685 #endif
 686     delete c;
 687 }
 688
 689 // Assumes everything is configured for the brush you want to use
 690 void QGL2PaintEngineExPrivate::fill(const QVectorPath& path)
 691 {
 692     transferMode(BrushDrawingMode);
 693
 694     if (snapToPixelGrid) {
 695         snapToPixelGrid = false;
 696         matrixDirty = true;
 697     }
 698
 699     // Might need to call updateMatrix to re-calculate inverseScale
 700     if (matrixDirty)
 701         updateMatrix();
 702
 703     const QPointF* const points = reinterpret_cast<const QPointF*>(path.points());
 704
 705     // Check to see if there's any hints
 706     if (path.shape() == QVectorPath::RectangleHint) {
 707         QGLRect rect(points[0].x(), points[0].y(), points[2].x(), points[2].y());
 708         prepareForDraw(currentBrush.isOpaque());
 709         composite(rect);
 710     } else if (path.isConvex()) {
 711
 712         if (path.isCacheable()) {
 713             QVectorPath::CacheEntry *data = path.lookupCacheData(q);
 714             QGL2PEVectorPathCache *cache;
 715
 716             bool updateCache = false;
 717
 718             if (data) {
 719                 cache = (QGL2PEVectorPathCache *) data->data;
 720                 // Check if scale factor is exceeded for curved paths and generate curves if so...
 721                 if (path.isCurved()) {
 722                     qreal scaleFactor = cache->iscale / inverseScale;
 723                     if (scaleFactor < 0.5 || scaleFactor > 2.0) {
 724 #ifdef QT_OPENGL_CACHE_AS_VBOS
 725                         glDeleteBuffers(1, &cache->vbo);
 726                         cache->vbo = 0;
 727                         Q_ASSERT(cache->ibo == 0);
 728 #else
 729                         qFree(cache->vertices);
 730                         Q_ASSERT(cache->indices == 0);
 731 #endif
 732                         updateCache = true;
 733                     }
 734                 }
 735             } else {
 736                 cache = new QGL2PEVectorPathCache;
 737                 data = const_cast<QVectorPath &>(path).addCacheData(q, cache, cleanupVectorPath);
 738                 updateCache = true;
 739             }
 740
 741             // Flatten the path at the current scale factor and fill it into the cache struct.
 742             if (updateCache) {
 743                 vertexCoordinateArray.clear();
 744                 vertexCoordinateArray.addPath(path, inverseScale, false);
 745                 int vertexCount = vertexCoordinateArray.vertexCount();
 746                 int floatSizeInBytes = vertexCount * 2 * sizeof(float);
 747                 cache->vertexCount = vertexCount;
 748                 cache->indexCount = 0;
 749                 cache->primitiveType = GL_TRIANGLE_FAN;
 750                 cache->iscale = inverseScale;
 751 #ifdef QT_OPENGL_CACHE_AS_VBOS
 752                 glGenBuffers(1, &cache->vbo);
 753                 glBindBuffer(GL_ARRAY_BUFFER, cache->vbo);
 754                 glBufferData(GL_ARRAY_BUFFER, floatSizeInBytes, vertexCoordinateArray.data(), GL_STATIC_DRAW);
 755                 cache->ibo = 0;
 756 #else
 757                 cache->vertices = (float *) qMalloc(floatSizeInBytes);
 758                 memcpy(cache->vertices, vertexCoordinateArray.data(), floatSizeInBytes);
 759                 cache->indices = 0;
 760 #endif
 761             }
 762
 763             prepareForDraw(currentBrush.isOpaque());
 764 #ifdef QT_OPENGL_CACHE_AS_VBOS
 765             glBindBuffer(GL_ARRAY_BUFFER, cache->vbo);
 766             setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, 0);
 767 #else
 768             setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, cache->vertices);
 769 #endif
 770             glDrawArrays(cache->primitiveType, 0, cache->vertexCount);
 771
 772         } else {
 773       //        printf(" - Marking path as cachable...\n");
 774             // Tag it for later so that if the same path is drawn twice, it is assumed to be static and thus cachable
 775             path.makeCacheable();
 776             vertexCoordinateArray.clear();
 777             vertexCoordinateArray.addPath(path, inverseScale, false);
 778             prepareForDraw(currentBrush.isOpaque());
 779             drawVertexArrays(vertexCoordinateArray, GL_TRIANGLE_FAN);
 780         }
 781
 782     } else {
 783         bool useCache = path.isCacheable();
 784         if (useCache) {
 785             QRectF bbox = path.controlPointRect();
 786             // If the path doesn't fit within these limits, it is possible that the triangulation will fail.
 787             useCache &= (bbox.left() > -0x8000 * inverseScale)
 788                      && (bbox.right() < 0x8000 * inverseScale)
 789                      && (bbox.top() > -0x8000 * inverseScale)
 790                      && (bbox.bottom() < 0x8000 * inverseScale);
 791         }
 792
 793         if (useCache) {
 794             QVectorPath::CacheEntry *data = path.lookupCacheData(q);
 795             QGL2PEVectorPathCache *cache;
 796
 797             bool updateCache = false;
 798
 799             if (data) {
 800                 cache = (QGL2PEVectorPathCache *) data->data;
 801                 // Check if scale factor is exceeded for curved paths and generate curves if so...
 802                 if (path.isCurved()) {
 803                     qreal scaleFactor = cache->iscale / inverseScale;
 804                     if (scaleFactor < 0.5 || scaleFactor > 2.0) {
 805 #ifdef QT_OPENGL_CACHE_AS_VBOS
 806                         glDeleteBuffers(1, &cache->vbo);
 807                         glDeleteBuffers(1, &cache->ibo);
 808 #else
 809                         qFree(cache->vertices);
 810                         qFree(cache->indices);
 811 #endif
 812                         updateCache = true;
 813                     }
 814                 }
 815             } else {
 816                 cache = new QGL2PEVectorPathCache;
 817                 data = const_cast<QVectorPath &>(path).addCacheData(q, cache, cleanupVectorPath);
 818                 updateCache = true;
 819             }
 820
 821             // Flatten the path at the current scale factor and fill it into the cache struct.
 822             if (updateCache) {
 823                 QTriangleSet polys = qTriangulate(path, QTransform().scale(1 / inverseScale, 1 / inverseScale));
 824                 cache->vertexCount = polys.vertices.size() / 2;
 825                 cache->indexCount = polys.indices.size();
 826                 cache->primitiveType = GL_TRIANGLES;
 827                 cache->iscale = inverseScale;
 828                 cache->indexType = polys.indices.type();
 829 #ifdef QT_OPENGL_CACHE_AS_VBOS
 830                 glGenBuffers(1, &cache->vbo);
 831                 glGenBuffers(1, &cache->ibo);
 832                 glBindBuffer(GL_ARRAY_BUFFER, cache->vbo);
 833                 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cache->ibo);
 834
 835                 if (polys.indices.type() == QVertexIndexVector::UnsignedInt)
 836                     glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(quint32) * polys.indices.size(), polys.indices.data(), GL_STATIC_DRAW);
 837                 else
 838                     glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(quint16) * polys.indices.size(), polys.indices.data(), GL_STATIC_DRAW);
 839
 840                 QVarLengthArray<float> vertices(polys.vertices.size());
 841                 for (int i = 0; i < polys.vertices.size(); ++i)
 842                     vertices[i] = float(inverseScale * polys.vertices.at(i));
 843                 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * vertices.size(), vertices.data(), GL_STATIC_DRAW);
 844 #else
 845                 cache->vertices = (float *) qMalloc(sizeof(float) * polys.vertices.size());
 846                 if (polys.indices.type() == QVertexIndexVector::UnsignedInt) {
 847                     cache->indices = (quint32 *) qMalloc(sizeof(quint32) * polys.indices.size());
 848                     memcpy(cache->indices, polys.indices.data(), sizeof(quint32) * polys.indices.size());
 849                 } else {
 850                     cache->indices = (quint16 *) qMalloc(sizeof(quint16) * polys.indices.size());
 851                     memcpy(cache->indices, polys.indices.data(), sizeof(quint16) * polys.indices.size());
 852                 }
 853                 for (int i = 0; i < polys.vertices.size(); ++i)
 854                     cache->vertices[i] = float(inverseScale * polys.vertices.at(i));
 855 #endif
 856             }
 857
 858             prepareForDraw(currentBrush.isOpaque());
 859 #ifdef QT_OPENGL_CACHE_AS_VBOS
 860             glBindBuffer(GL_ARRAY_BUFFER, cache->vbo);
 861             glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cache->ibo);
 862             setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, 0);
 863             if (cache->indexType == QVertexIndexVector::UnsignedInt)
 864                 glDrawElements(cache->primitiveType, cache->indexCount, GL_UNSIGNED_INT, 0);
 865             else
 866                 glDrawElements(cache->primitiveType, cache->indexCount, GL_UNSIGNED_SHORT, 0);
 867             glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
 868             glBindBuffer(GL_ARRAY_BUFFER, 0);
 869 #else
 870             setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, cache->vertices);
 871             if (cache->indexType == QVertexIndexVector::UnsignedInt)
 872                 glDrawElements(cache->primitiveType, cache->indexCount, GL_UNSIGNED_INT, (qint32 *)cache->indices);
 873             else
 874                 glDrawElements(cache->primitiveType, cache->indexCount, GL_UNSIGNED_SHORT, (qint16 *)cache->indices);
 875 #endif
 876
 877         } else {
 878       //        printf(" - Marking path as cachable...\n");
 879             // Tag it for later so that if the same path is drawn twice, it is assumed to be static and thus cachable
 880             path.makeCacheable();
 881
 882             if (!device->format().stencil()) {
 883                 // If there is no stencil buffer, triangulate the path instead.
 884
 885                 QRectF bbox = path.controlPointRect();
 886                 // If the path doesn't fit within these limits, it is possible that the triangulation will fail.
 887                 bool withinLimits = (bbox.left() > -0x8000 * inverseScale)
 888                                   && (bbox.right() < 0x8000 * inverseScale)
 889                                   && (bbox.top() > -0x8000 * inverseScale)
 890                                   && (bbox.bottom() < 0x8000 * inverseScale);
 891                 if (withinLimits) {
 892                     QTriangleSet polys = qTriangulate(path, QTransform().scale(1 / inverseScale, 1 / inverseScale));
 893
 894                     QVarLengthArray<float> vertices(polys.vertices.size());
 895                     for (int i = 0; i < polys.vertices.size(); ++i)
 896                         vertices[i] = float(inverseScale * polys.vertices.at(i));
 897
 898                     prepareForDraw(currentBrush.isOpaque());
 899                     setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, vertices.constData());
 900                     if (polys.indices.type() == QVertexIndexVector::UnsignedInt)
 901                         glDrawElements(GL_TRIANGLES, polys.indices.size(), GL_UNSIGNED_INT, polys.indices.data());
 902                     else
 903                         glDrawElements(GL_TRIANGLES, polys.indices.size(), GL_UNSIGNED_SHORT, polys.indices.data());
 904                 } else {
 905                     // We can't handle big, concave painter paths with OpenGL without stencil buffer.
 906                     qWarning("Painter path exceeds +/-32767 pixels.");
 907                 }
 908                 return;
 909             }
 910
 911             // The path is too complicated & needs the stencil technique
 912             vertexCoordinateArray.clear();
 913             vertexCoordinateArray.addPath(path, inverseScale, false);
 914
 915             fillStencilWithVertexArray(vertexCoordinateArray, path.hasWindingFill());
 916
 917             glStencilMask(0xff);
 918             glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE);
 919
 920             if (q->state()->clipTestEnabled) {
 921                 // Pass when high bit is set, replace stencil value with current clip
 922                 glStencilFunc(GL_NOTEQUAL, q->state()->currentClip, GL_STENCIL_HIGH_BIT);
 923             } else if (path.hasWindingFill()) {
 924                 // Pass when any bit is set, replace stencil value with 0
 925                 glStencilFunc(GL_NOTEQUAL, 0, 0xff);
 926             } else {
 927                 // Pass when high bit is set, replace stencil value with 0
 928                 glStencilFunc(GL_NOTEQUAL, 0, GL_STENCIL_HIGH_BIT);
 929             }
 930             prepareForDraw(currentBrush.isOpaque());
 931
 932             // Stencil the brush onto the dest buffer
 933             composite(vertexCoordinateArray.boundingRect());
 934             glStencilMask(0);
 935             updateClipScissorTest();
 936         }
 937     }
 938 }
 939
 940
 941 void QGL2PaintEngineExPrivate::fillStencilWithVertexArray(const float *data,
 942                                                           int count,
 943                                                           int *stops,
 944                                                           int stopCount,
 945                                                           const QGLRect &bounds,
 946                                                           StencilFillMode mode)
 947 {
 948     Q_ASSERT(count || stops);
 949
 950 //     qDebug("QGL2PaintEngineExPrivate::fillStencilWithVertexArray()");
 951     glStencilMask(0xff); // Enable stencil writes
 952
 953     if (dirtyStencilRegion.intersects(currentScissorBounds)) {
 954         QVector<QRect> clearRegion = dirtyStencilRegion.intersected(currentScissorBounds).rects();
 955         glClearStencil(0); // Clear to zero
 956         for (int i = 0; i < clearRegion.size(); ++i) {
 957 #ifndef QT_GL_NO_SCISSOR_TEST
 958             setScissor(clearRegion.at(i));
 959 #endif
 960             glClear(GL_STENCIL_BUFFER_BIT);
 961         }
 962
 963         dirtyStencilRegion -= currentScissorBounds;
 964
 965 #ifndef QT_GL_NO_SCISSOR_TEST
 966         updateClipScissorTest();
 967 #endif
 968     }
 969
 970     glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); // Disable color writes
 971     useSimpleShader();
 972     glEnable(GL_STENCIL_TEST); // For some reason, this has to happen _after_ the simple shader is use()'d
 973
 974     if (mode == WindingFillMode) {
 975         Q_ASSERT(stops && !count);
 976         if (q->state()->clipTestEnabled) {
 977             // Flatten clip values higher than current clip, and set high bit to match current clip
 978             glStencilFunc(GL_LEQUAL, GL_STENCIL_HIGH_BIT | q->state()->currentClip, ~GL_STENCIL_HIGH_BIT);
 979             glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE);
 980             composite(bounds);
 981
 982             glStencilFunc(GL_EQUAL, GL_STENCIL_HIGH_BIT, GL_STENCIL_HIGH_BIT);
 983         } else if (!stencilClean) {
 984             // Clear stencil buffer within bounding rect
 985             glStencilFunc(GL_ALWAYS, 0, 0xff);
 986             glStencilOp(GL_ZERO, GL_ZERO, GL_ZERO);
 987             composite(bounds);
 988         }
 989
 990         // Inc. for front-facing triangle
 991         glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_INCR_WRAP, GL_INCR_WRAP);
 992         // Dec. for back-facing "holes"
 993         glStencilOpSeparate(GL_BACK, GL_KEEP, GL_DECR_WRAP, GL_DECR_WRAP);
 994         glStencilMask(~GL_STENCIL_HIGH_BIT);
 995         drawVertexArrays(data, stops, stopCount, GL_TRIANGLE_FAN);
 996
 997         if (q->state()->clipTestEnabled) {
 998             // Clear high bit of stencil outside of path
 999             glStencilFunc(GL_EQUAL, q->state()->currentClip, ~GL_STENCIL_HIGH_BIT);
1000             glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE);
1001             glStencilMask(GL_STENCIL_HIGH_BIT);
1002             composite(bounds);
1003         }
1004     } else if (mode == OddEvenFillMode) {
1005         glStencilMask(GL_STENCIL_HIGH_BIT);
1006         glStencilOp(GL_KEEP, GL_KEEP, GL_INVERT); // Simply invert the stencil bit
1007         drawVertexArrays(data, stops, stopCount, GL_TRIANGLE_FAN);
1008
1009     } else { // TriStripStrokeFillMode
1010         Q_ASSERT(count && !stops); // tristrips generated directly, so no vertexArray or stops
1011         glStencilMask(GL_STENCIL_HIGH_BIT);
1012 #if 0
1013         glStencilOp(GL_KEEP, GL_KEEP, GL_INVERT); // Simply invert the stencil bit
1014         setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, data);
1015         glDrawArrays(GL_TRIANGLE_STRIP, 0, count);
1016 #else
1017
1018         glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
1019         if (q->state()->clipTestEnabled) {
1020             glStencilFunc(GL_LEQUAL, q->state()->currentClip | GL_STENCIL_HIGH_BIT,
1021                           ~GL_STENCIL_HIGH_BIT);
1022         } else {
1023             glStencilFunc(GL_ALWAYS, GL_STENCIL_HIGH_BIT, 0xff);
1024         }
1025         setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, data);
1026         glDrawArrays(GL_TRIANGLE_STRIP, 0, count);
1027 #endif
1028     }
1029
1030     // Enable color writes & disable stencil writes
1031     glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
1032 }
1033
1034 /*
1035     If the maximum value in the stencil buffer is GL_STENCIL_HIGH_BIT - 1,
1036     restore the stencil buffer to a pristine state.  The current clip region
1037     is set to 1, and the rest to 0.
1038 */
1039 void QGL2PaintEngineExPrivate::resetClipIfNeeded()
1040 {
1041     if (maxClip != (GL_STENCIL_HIGH_BIT - 1))
1042         return;
1043
1044     Q_Q(QGL2PaintEngineEx);
1045
1046     useSimpleShader();
1047     glEnable(GL_STENCIL_TEST);
1048     glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
1049
1050     QRectF bounds = q->state()->matrix.inverted().mapRect(QRectF(0, 0, width, height));
1051     QGLRect rect(bounds.left(), bounds.top(), bounds.right(), bounds.bottom());
1052
1053     // Set high bit on clip region
1054     glStencilFunc(GL_LEQUAL, q->state()->currentClip, 0xff);
1055     glStencilOp(GL_KEEP, GL_INVERT, GL_INVERT);
1056     glStencilMask(GL_STENCIL_HIGH_BIT);
1057     composite(rect);
1058
1059     // Reset clipping to 1 and everything else to zero
1060     glStencilFunc(GL_NOTEQUAL, 0x01, GL_STENCIL_HIGH_BIT);
1061     glStencilOp(GL_ZERO, GL_REPLACE, GL_REPLACE);
1062     glStencilMask(0xff);
1063     composite(rect);
1064
1065     q->state()->currentClip = 1;
1066     q->state()->canRestoreClip = false;
1067
1068     maxClip = 1;
1069
1070     glStencilMask(0x0);
1071     glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
1072 }
1073
1074 bool QGL2PaintEngineExPrivate::prepareForDraw(bool srcPixelsAreOpaque)
1075 {
1076     if (brushTextureDirty && mode != ImageDrawingMode && mode != ImageArrayDrawingMode)
1077         updateBrushTexture();
1078
1079     if (compositionModeDirty)
1080         updateCompositionMode();
1081
1082     if (matrixDirty)
1083         updateMatrix();
1084
1085     const bool stateHasOpacity = q->state()->opacity < 0.99f;
1086     if (q->state()->composition_mode == QPainter::CompositionMode_Source
1087         || (q->state()->composition_mode == QPainter::CompositionMode_SourceOver
1088             && srcPixelsAreOpaque && !stateHasOpacity))
1089     {
1090         glDisable(GL_BLEND);
1091     } else {
1092         glEnable(GL_BLEND);
1093     }
1094
1095     QGLEngineShaderManager::OpacityMode opacityMode;
1096     if (mode == ImageArrayDrawingMode) {
1097         opacityMode = QGLEngineShaderManager::AttributeOpacity;
1098     } else {
1099         opacityMode = stateHasOpacity ? QGLEngineShaderManager::UniformOpacity
1100                                       : QGLEngineShaderManager::NoOpacity;
1101         if (stateHasOpacity && (mode != ImageDrawingMode)) {
1102             // Using a brush
1103             bool brushIsPattern = (currentBrush.style() >= Qt::Dense1Pattern) &&
1104                                   (currentBrush.style() <= Qt::DiagCrossPattern);
1105
1106             if ((currentBrush.style() == Qt::SolidPattern) || brushIsPattern)
1107                 opacityMode = QGLEngineShaderManager::NoOpacity; // Global opacity handled by srcPixel shader
1108         }
1109     }
1110     shaderManager->setOpacityMode(opacityMode);
1111
1112     bool changed = shaderManager->useCorrectShaderProg();
1113     // If the shader program needs changing, we change it and mark all uniforms as dirty
1114     if (changed) {
1115         // The shader program has changed so mark all uniforms as dirty:
1116         brushUniformsDirty = true;
1117         opacityUniformDirty = true;
1118         matrixUniformDirty = true;
1119     }
1120
1121     if (brushUniformsDirty && mode != ImageDrawingMode && mode != ImageArrayDrawingMode)
1122         updateBrushUniforms();
1123
1124     if (opacityMode == QGLEngineShaderManager::UniformOpacity && opacityUniformDirty) {
1125         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::GlobalOpacity), (GLfloat)q->state()->opacity);
1126         opacityUniformDirty = false;
1127     }
1128
1129     if (matrixUniformDirty && shaderManager->hasComplexGeometry()) {
1130         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::Matrix),
1131                                                          pmvMatrix);
1132         matrixUniformDirty = false;
1133     }
1134
1135     return changed;
1136 }
1137
1138 void QGL2PaintEngineExPrivate::composite(const QGLRect& boundingRect)
1139 {
1140     setCoords(staticVertexCoordinateArray, boundingRect);
1141     setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, staticVertexCoordinateArray);
1142     glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
1143 }
1144
1145 // Draws the vertex array as a set of <vertexArrayStops.size()> triangle fans.
1146 void QGL2PaintEngineExPrivate::drawVertexArrays(const float *data, int *stops, int stopCount,
1147                                                 GLenum primitive)
1148 {
1149     // Now setup the pointer to the vertex array:
1150     setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, (GLfloat*)data);
1151
1152     int previousStop = 0;
1153     for (int i=0; i<stopCount; ++i) {
1154         int stop = stops[i];
1155 /*
1156         qDebug("Drawing triangle fan for vertecies %d -> %d:", previousStop, stop-1);
1157         for (int i=previousStop; i<stop; ++i)
1158             qDebug("   %02d: [%.2f, %.2f]", i, vertexArray.data()[i].x, vertexArray.data()[i].y);
1159 */
1160         glDrawArrays(primitive, previousStop, stop - previousStop);
1161         previousStop = stop;
1162     }
1163 }
1164
1165 /////////////////////////////////// Public Methods //////////////////////////////////////////
1166
1167 QGL2PaintEngineEx::QGL2PaintEngineEx()
1168     : QPaintEngineEx(*(new QGL2PaintEngineExPrivate(this)))
1169 {
1170 }
1171
1172 QGL2PaintEngineEx::~QGL2PaintEngineEx()
1173 {
1174 }
1175
1176 void QGL2PaintEngineEx::fill(const QVectorPath &path, const QBrush &brush)
1177 {
1178     Q_D(QGL2PaintEngineEx);
1179
1180     if (qbrush_style(brush) == Qt::NoBrush)
1181         return;
1182     ensureActive();
1183     d->setBrush(brush);
1184     d->fill(path);
1185 }
1186
1187 Q_GUI_EXPORT bool qt_scaleForTransform(const QTransform &transform, qreal *scale); // qtransform.cpp
1188
1189
1190 void QGL2PaintEngineEx::stroke(const QVectorPath &path, const QPen &pen)
1191 {
1192     Q_D(QGL2PaintEngineEx);
1193
1194     const QBrush &penBrush = qpen_brush(pen);
1195     if (qpen_style(pen) == Qt::NoPen || qbrush_style(penBrush) == Qt::NoBrush)
1196         return;
1197
1198     QOpenGL2PaintEngineState *s = state();
1199     if (pen.isCosmetic() && !qt_scaleForTransform(s->transform(), 0)) {
1200         // QTriangulatingStroker class is not meant to support cosmetically sheared strokes.
1201         QPaintEngineEx::stroke(path, pen);
1202         return;
1203     }
1204
1205     ensureActive();
1206     d->setBrush(penBrush);
1207     d->stroke(path, pen);
1208 }
1209
1210 void QGL2PaintEngineExPrivate::stroke(const QVectorPath &path, const QPen &pen)
1211 {
1212     const QOpenGL2PaintEngineState *s = q->state();
1213     if (snapToPixelGrid) {
1214         snapToPixelGrid = false;
1215         matrixDirty = true;
1216     }
1217
1218     const Qt::PenStyle penStyle = qpen_style(pen);
1219     const QBrush &penBrush = qpen_brush(pen);
1220     const bool opaque = penBrush.isOpaque() && s->opacity > 0.99;
1221
1222     transferMode(BrushDrawingMode);
1223
1224     // updateMatrix() is responsible for setting the inverse scale on
1225     // the strokers, so we need to call it here and not wait for
1226     // prepareForDraw() down below.
1227     updateMatrix();
1228
1229     QRectF clip = q->state()->matrix.inverted().mapRect(q->state()->clipEnabled
1230                                                         ? q->state()->rectangleClip
1231                                                         : QRectF(0, 0, width, height));
1232
1233     if (penStyle == Qt::SolidLine) {
1234         stroker.process(path, pen, clip);
1235
1236     } else { // Some sort of dash
1237         dasher.process(path, pen, clip);
1238
1239         QVectorPath dashStroke(dasher.points(),
1240                                dasher.elementCount(),
1241                                dasher.elementTypes());
1242         stroker.process(dashStroke, pen, clip);
1243     }
1244
1245     if (!stroker.vertexCount())
1246         return;
1247
1248     if (opaque) {
1249         prepareForDraw(opaque);
1250         setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, stroker.vertices());
1251         glDrawArrays(GL_TRIANGLE_STRIP, 0, stroker.vertexCount() / 2);
1252
1253 //         QBrush b(Qt::green);
1254 //         d->setBrush(&b);
1255 //         d->prepareForDraw(true);
1256 //         glDrawArrays(GL_LINE_STRIP, 0, d->stroker.vertexCount() / 2);
1257
1258     } else {
1259         qreal width = qpen_widthf(pen) / 2;
1260         if (width == 0)
1261             width = 0.5;
1262         qreal extra = pen.joinStyle() == Qt::MiterJoin
1263                       ? qMax(pen.miterLimit() * width, width)
1264                       : width;
1265
1266         if (pen.isCosmetic())
1267             extra = extra * inverseScale;
1268
1269         QRectF bounds = path.controlPointRect().adjusted(-extra, -extra, extra, extra);
1270
1271         fillStencilWithVertexArray(stroker.vertices(), stroker.vertexCount() / 2,
1272                                       0, 0, bounds, QGL2PaintEngineExPrivate::TriStripStrokeFillMode);
1273
1274         glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE);
1275
1276         // Pass when any bit is set, replace stencil value with 0
1277         glStencilFunc(GL_NOTEQUAL, 0, GL_STENCIL_HIGH_BIT);
1278         prepareForDraw(false);
1279
1280         // Stencil the brush onto the dest buffer
1281         composite(bounds);
1282
1283         glStencilMask(0);
1284
1285         updateClipScissorTest();
1286     }
1287 }
1288
1289 void QGL2PaintEngineEx::penChanged() { }
1290 void QGL2PaintEngineEx::brushChanged() { }
1291 void QGL2PaintEngineEx::brushOriginChanged() { }
1292
1293 void QGL2PaintEngineEx::opacityChanged()
1294 {
1295 //    qDebug("QGL2PaintEngineEx::opacityChanged()");
1296     Q_D(QGL2PaintEngineEx);
1297     state()->opacityChanged = true;
1298
1299     Q_ASSERT(d->shaderManager);
1300     d->brushUniformsDirty = true;
1301     d->opacityUniformDirty = true;
1302 }
1303
1304 void QGL2PaintEngineEx::compositionModeChanged()
1305 {
1306 //     qDebug("QGL2PaintEngineEx::compositionModeChanged()");
1307     Q_D(QGL2PaintEngineEx);
1308     state()->compositionModeChanged = true;
1309     d->compositionModeDirty = true;
1310 }
1311
1312 void QGL2PaintEngineEx::renderHintsChanged()
1313 {
1314     state()->renderHintsChanged = true;
1315
1316 #if !defined(QT_OPENGL_ES_2)
1317     if ((state()->renderHints & QPainter::Antialiasing)
1318         || (state()->renderHints & QPainter::HighQualityAntialiasing))
1319         glEnable(GL_MULTISAMPLE);
1320     else
1321         glDisable(GL_MULTISAMPLE);
1322 #endif
1323
1324     Q_D(QGL2PaintEngineEx);
1325     d->lastTextureUsed = GLuint(-1);
1326     d->brushTextureDirty = true;
1327 //    qDebug("QGL2PaintEngineEx::renderHintsChanged() not implemented!");
1328 }
1329
1330 void QGL2PaintEngineEx::transformChanged()
1331 {
1332     Q_D(QGL2PaintEngineEx);
1333     d->matrixDirty = true;
1334     state()->matrixChanged = true;
1335 }
1336
1337
1338 static const QRectF scaleRect(const QRectF &r, qreal sx, qreal sy)
1339 {
1340     return QRectF(r.x() * sx, r.y() * sy, r.width() * sx, r.height() * sy);
1341 }
1342
1343 void QGL2PaintEngineEx::drawPixmap(const QRectF& dest, const QPixmap & pixmap, const QRectF & src)
1344 {
1345     Q_D(QGL2PaintEngineEx);
1346     QGLContext *ctx = d->ctx;
1347
1348     int max_texture_size = ctx->d_func()->maxTextureSize();
1349     if (pixmap.width() > max_texture_size || pixmap.height() > max_texture_size) {
1350         QPixmap scaled = pixmap.scaled(max_texture_size, max_texture_size, Qt::KeepAspectRatio);
1351
1352         const qreal sx = scaled.width() / qreal(pixmap.width());
1353         const qreal sy = scaled.height() / qreal(pixmap.height());
1354
1355         drawPixmap(dest, scaled, scaleRect(src, sx, sy));
1356         return;
1357     }
1358
1359     ensureActive();
1360     d->transferMode(ImageDrawingMode);
1361
1362     QGLContext::BindOptions bindOptions = QGLContext::InternalBindOption|QGLContext::CanFlipNativePixmapBindOption;
1363 #ifdef QGL_USE_TEXTURE_POOL
1364     bindOptions |= QGLContext::TemporarilyCachedBindOption;
1365 #endif
1366
1367     glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
1368     QGLTexture *texture =
1369         ctx->d_func()->bindTexture(pixmap, GL_TEXTURE_2D, GL_RGBA, bindOptions);
1370
1371     GLfloat top = texture->options & QGLContext::InvertedYBindOption ? (pixmap.height() - src.top()) : src.top();
1372     GLfloat bottom = texture->options & QGLContext::InvertedYBindOption ? (pixmap.height() - src.bottom()) : src.bottom();
1373     QGLRect srcRect(src.left(), top, src.right(), bottom);
1374
1375     bool isBitmap = pixmap.isQBitmap();
1376     bool isOpaque = !isBitmap && !pixmap.hasAlpha();
1377
1378     d->updateTextureFilter(GL_TEXTURE_2D, GL_CLAMP_TO_EDGE,
1379                            state()->renderHints & QPainter::SmoothPixmapTransform, texture->id);
1380     d->drawTexture(dest, srcRect, pixmap.size(), isOpaque, isBitmap);
1381
1382     if (texture->options&QGLContext::TemporarilyCachedBindOption) {
1383         // pixmap was temporarily cached as a QImage texture by pooling system
1384         // and should be destroyed immediately
1385         QGLTextureCache::instance()->remove(ctx, texture->id);
1386     }
1387 }
1388
1389 void QGL2PaintEngineEx::drawImage(const QRectF& dest, const QImage& image, const QRectF& src,
1390                         Qt::ImageConversionFlags)
1391 {
1392     Q_D(QGL2PaintEngineEx);
1393     QGLContext *ctx = d->ctx;
1394
1395     int max_texture_size = ctx->d_func()->maxTextureSize();
1396     if (image.width() > max_texture_size || image.height() > max_texture_size) {
1397         QImage scaled = image.scaled(max_texture_size, max_texture_size, Qt::KeepAspectRatio);
1398
1399         const qreal sx = scaled.width() / qreal(image.width());
1400         const qreal sy = scaled.height() / qreal(image.height());
1401
1402         drawImage(dest, scaled, scaleRect(src, sx, sy));
1403         return;
1404     }
1405
1406     ensureActive();
1407     d->transferMode(ImageDrawingMode);
1408
1409     glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
1410
1411     QGLContext::BindOptions bindOptions = QGLContext::InternalBindOption;
1412 #ifdef QGL_USE_TEXTURE_POOL
1413     bindOptions |= QGLContext::TemporarilyCachedBindOption;
1414 #endif
1415
1416     QGLTexture *texture = ctx->d_func()->bindTexture(image, GL_TEXTURE_2D, GL_RGBA, bindOptions);
1417     GLuint id = texture->id;
1418
1419     d->updateTextureFilter(GL_TEXTURE_2D, GL_CLAMP_TO_EDGE,
1420                            state()->renderHints & QPainter::SmoothPixmapTransform, id);
1421     d->drawTexture(dest, src, image.size(), !image.hasAlphaChannel());
1422
1423     if (texture->options&QGLContext::TemporarilyCachedBindOption) {
1424         // image was temporarily cached by texture pooling system
1425         // and should be destroyed immediately
1426         QGLTextureCache::instance()->remove(ctx, texture->id);
1427     }
1428 }
1429
1430 void QGL2PaintEngineEx::drawStaticTextItem(QStaticTextItem *textItem)
1431 {
1432     Q_D(QGL2PaintEngineEx);
1433
1434     ensureActive();
1435
1436     QPainterState *s = state();
1437     float det = s->matrix.determinant();
1438
1439     // don't try to cache huge fonts or vastly transformed fonts
1440     QFontEngine *fontEngine = textItem->fontEngine();
1441     const qreal pixelSize = fontEngine->fontDef.pixelSize;
1442     if (shouldDrawCachedGlyphs(pixelSize, s->matrix) || det < 0.25f || det > 4.f) {
1443         QFontEngineGlyphCache::Type glyphType = fontEngine->glyphFormat >= 0
1444                                                 ? QFontEngineGlyphCache::Type(textItem->fontEngine()->glyphFormat)
1445                                                 : d->glyphCacheType;
1446         if (glyphType == QFontEngineGlyphCache::Raster_RGBMask) {
1447             if (d->device->alphaRequested() || s->matrix.type() > QTransform::TxTranslate
1448                 || (s->composition_mode != QPainter::CompositionMode_Source
1449                 && s->composition_mode != QPainter::CompositionMode_SourceOver))
1450             {
1451                 glyphType = QFontEngineGlyphCache::Raster_A8;
1452             }
1453         }
1454
1455         d->drawCachedGlyphs(glyphType, textItem);
1456     } else {
1457         QPaintEngineEx::drawStaticTextItem(textItem);
1458     }
1459 }
1460
1461 bool QGL2PaintEngineEx::drawTexture(const QRectF &dest, GLuint textureId, const QSize &size, const QRectF &src)
1462 {
1463     Q_D(QGL2PaintEngineEx);
1464     if (!d->shaderManager)
1465         return false;
1466
1467     ensureActive();
1468     d->transferMode(ImageDrawingMode);
1469
1470 #ifndef QT_OPENGL_ES_2
1471     QGLContext *ctx = d->ctx;
1472 #endif
1473     glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
1474     glBindTexture(GL_TEXTURE_2D, textureId);
1475
1476     QGLRect srcRect(src.left(), src.bottom(), src.right(), src.top());
1477
1478     d->updateTextureFilter(GL_TEXTURE_2D, GL_CLAMP_TO_EDGE,
1479                            state()->renderHints & QPainter::SmoothPixmapTransform, textureId);
1480     d->drawTexture(dest, srcRect, size, false);
1481     return true;
1482 }
1483
1484 void QGL2PaintEngineEx::drawTextItem(const QPointF &p, const QTextItem &textItem)
1485 {
1486     Q_D(QGL2PaintEngineEx);
1487
1488     ensureActive();
1489     QOpenGL2PaintEngineState *s = state();
1490
1491     const QTextItemInt &ti = static_cast<const QTextItemInt &>(textItem);
1492
1493     QTransform::TransformationType txtype = s->matrix.type();
1494
1495     float det = s->matrix.determinant();
1496     bool drawCached = txtype < QTransform::TxProject;
1497
1498     // don't try to cache huge fonts or vastly transformed fonts
1499     const qreal pixelSize = ti.fontEngine->fontDef.pixelSize;
1500     if (shouldDrawCachedGlyphs(pixelSize, s->matrix) || det < 0.25f || det > 4.f)
1501         drawCached = false;
1502
1503     QFontEngineGlyphCache::Type glyphType = ti.fontEngine->glyphFormat >= 0
1504                                             ? QFontEngineGlyphCache::Type(ti.fontEngine->glyphFormat)
1505                                             : d->glyphCacheType;
1506
1507
1508     if (glyphType == QFontEngineGlyphCache::Raster_RGBMask) {
1509         if (d->device->alphaRequested() || txtype > QTransform::TxTranslate
1510             || (state()->composition_mode != QPainter::CompositionMode_Source
1511             && state()->composition_mode != QPainter::CompositionMode_SourceOver))
1512         {
1513             glyphType = QFontEngineGlyphCache::Raster_A8;
1514         }
1515     }
1516
1517     if (drawCached) {
1518         QVarLengthArray<QFixedPoint> positions;
1519         QVarLengthArray<glyph_t> glyphs;
1520         QTransform matrix = QTransform::fromTranslate(p.x(), p.y());
1521         ti.fontEngine->getGlyphPositions(ti.glyphs, matrix, ti.flags, glyphs, positions);
1522
1523         {
1524             QStaticTextItem staticTextItem;
1525             staticTextItem.chars = const_cast<QChar *>(ti.chars);
1526             staticTextItem.setFontEngine(ti.fontEngine);
1527             staticTextItem.glyphs = glyphs.data();
1528             staticTextItem.numChars = ti.num_chars;
1529             staticTextItem.numGlyphs = glyphs.size();
1530             staticTextItem.glyphPositions = positions.data();
1531
1532             d->drawCachedGlyphs(glyphType, &staticTextItem);
1533         }
1534         return;
1535     }
1536
1537     QPaintEngineEx::drawTextItem(p, ti);
1538 }
1539
1540 namespace {
1541
1542     class QOpenGLStaticTextUserData: public QStaticTextUserData
1543     {
1544     public:
1545         QOpenGLStaticTextUserData()
1546             : QStaticTextUserData(OpenGLUserData), cacheSize(0, 0), cacheSerialNumber(0)
1547         {
1548         }
1549
1550         ~QOpenGLStaticTextUserData()
1551         {
1552         }
1553
1554         QSize cacheSize;
1555         QGL2PEXVertexArray vertexCoordinateArray;
1556         QGL2PEXVertexArray textureCoordinateArray;
1557         QFontEngineGlyphCache::Type glyphType;
1558         int cacheSerialNumber;
1559     };
1560
1561 }
1562
1563 #if defined(Q_WS_WIN)
1564 static bool fontSmoothingApproximately(qreal target)
1565 {
1566     extern Q_GUI_EXPORT qreal qt_fontsmoothing_gamma; // qapplication_win.cpp
1567     return (qAbs(qt_fontsmoothing_gamma - target) < 0.2);
1568 }
1569 #endif
1570
1571 // #define QT_OPENGL_DRAWCACHEDGLYPHS_INDEX_ARRAY_VBO
1572
1573 void QGL2PaintEngineExPrivate::drawCachedGlyphs(QFontEngineGlyphCache::Type glyphType,
1574                                                 QStaticTextItem *staticTextItem)
1575 {
1576     Q_Q(QGL2PaintEngineEx);
1577
1578     QOpenGL2PaintEngineState *s = q->state();
1579
1580     void *cacheKey = const_cast<QGLContext *>(QGLContextPrivate::contextGroup(ctx)->context());
1581     bool recreateVertexArrays = false;
1582
1583     QGLTextureGlyphCache *cache =
1584             (QGLTextureGlyphCache *) staticTextItem->fontEngine()->glyphCache(cacheKey, glyphType, QTransform());
1585     if (!cache || cache->cacheType() != glyphType || cache->contextGroup() == 0) {
1586         cache = new QGLTextureGlyphCache(glyphType, QTransform());
1587         staticTextItem->fontEngine()->setGlyphCache(cacheKey, cache);
1588         recreateVertexArrays = true;
1589     }
1590
1591     if (staticTextItem->userDataNeedsUpdate) {
1592         recreateVertexArrays = true;
1593     } else if (staticTextItem->userData() == 0) {
1594         recreateVertexArrays = true;
1595     } else if (staticTextItem->userData()->type != QStaticTextUserData::OpenGLUserData) {
1596         recreateVertexArrays = true;
1597     } else {
1598         QOpenGLStaticTextUserData *userData = static_cast<QOpenGLStaticTextUserData *>(staticTextItem->userData());
1599         if (userData->glyphType != glyphType) {
1600             recreateVertexArrays = true;
1601         } else if (userData->cacheSerialNumber != cache->serialNumber()) {
1602             recreateVertexArrays = true;
1603         }
1604     }
1605
1606     // We only need to update the cache with new glyphs if we are actually going to recreate the vertex arrays.
1607     // If the cache size has changed, we do need to regenerate the vertices, but we don't need to repopulate the
1608     // cache so this text is performed before we test if the cache size has changed.
1609     if (recreateVertexArrays) {
1610         cache->setPaintEnginePrivate(this);
1611         if (!cache->populate(staticTextItem->fontEngine(), staticTextItem->numGlyphs,
1612                              staticTextItem->glyphs, staticTextItem->glyphPositions)) {
1613             // No space for glyphs in cache. We need to reset it and try again.
1614             cache->clear();
1615             cache->populate(staticTextItem->fontEngine(), staticTextItem->numGlyphs,
1616                             staticTextItem->glyphs, staticTextItem->glyphPositions);
1617         }
1618         cache->fillInPendingGlyphs();
1619     }
1620
1621     if (cache->width() == 0 || cache->height() == 0)
1622         return;
1623
1624     transferMode(TextDrawingMode);
1625
1626     int margin = cache->glyphMargin();
1627
1628     GLfloat dx = 1.0 / cache->width();
1629     GLfloat dy = 1.0 / cache->height();
1630
1631     // Use global arrays by default
1632     QGL2PEXVertexArray *vertexCoordinates = &vertexCoordinateArray;
1633     QGL2PEXVertexArray *textureCoordinates = &textureCoordinateArray;
1634
1635     if (staticTextItem->useBackendOptimizations) {
1636         QOpenGLStaticTextUserData *userData = 0;
1637
1638         if (staticTextItem->userData() == 0
1639             || staticTextItem->userData()->type != QStaticTextUserData::OpenGLUserData) {
1640
1641             userData = new QOpenGLStaticTextUserData();
1642             staticTextItem->setUserData(userData);
1643
1644         } else {
1645             userData = static_cast<QOpenGLStaticTextUserData*>(staticTextItem->userData());
1646         }
1647
1648         userData->glyphType = glyphType;
1649         userData->cacheSerialNumber = cache->serialNumber();
1650
1651         // Use cache if backend optimizations is turned on
1652         vertexCoordinates = &userData->vertexCoordinateArray;
1653         textureCoordinates = &userData->textureCoordinateArray;
1654
1655         QSize size(cache->width(), cache->height());
1656         if (userData->cacheSize != size) {
1657             recreateVertexArrays = true;
1658             userData->cacheSize = size;
1659         }
1660     }
1661
1662     if (recreateVertexArrays) {
1663         vertexCoordinates->clear();
1664         textureCoordinates->clear();
1665
1666         bool supportsSubPixelPositions = staticTextItem->fontEngine()->supportsSubPixelPositions();
1667         for (int i=0; i<staticTextItem->numGlyphs; ++i) {
1668             QFixed subPixelPosition;
1669             if (supportsSubPixelPositions)
1670                 subPixelPosition = cache->subPixelPositionForX(staticTextItem->glyphPositions[i].x);
1671
1672             QTextureGlyphCache::GlyphAndSubPixelPosition glyph(staticTextItem->glyphs[i], subPixelPosition);
1673
1674             const QTextureGlyphCache::Coord &c = cache->coords[glyph];
1675             if (c.isNull())
1676                 continue;
1677
1678             int x = qFloor(staticTextItem->glyphPositions[i].x) + c.baseLineX - margin;
1679             int y = qFloor(staticTextItem->glyphPositions[i].y) - c.baseLineY - margin;
1680
1681             vertexCoordinates->addQuad(QRectF(x, y, c.w, c.h));
1682             textureCoordinates->addQuad(QRectF(c.x*dx, c.y*dy, c.w * dx, c.h * dy));
1683         }
1684
1685         staticTextItem->userDataNeedsUpdate = false;
1686     }
1687
1688     int numGlyphs = vertexCoordinates->vertexCount() / 4;
1689     if (numGlyphs == 0)
1690         return;
1691
1692     if (elementIndices.size() < numGlyphs*6) {
1693         Q_ASSERT(elementIndices.size() % 6 == 0);
1694         int j = elementIndices.size() / 6 * 4;
1695         while (j < numGlyphs*4) {
1696             elementIndices.append(j + 0);
1697             elementIndices.append(j + 0);
1698             elementIndices.append(j + 1);
1699             elementIndices.append(j + 2);
1700             elementIndices.append(j + 3);
1701             elementIndices.append(j + 3);
1702
1703             j += 4;
1704         }
1705
1706 #if defined(QT_OPENGL_DRAWCACHEDGLYPHS_INDEX_ARRAY_VBO)
1707         if (elementIndicesVBOId == 0)
1708             glGenBuffers(1, &elementIndicesVBOId);
1709
1710         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elementIndicesVBOId);
1711         glBufferData(GL_ELEMENT_ARRAY_BUFFER, elementIndices.size() * sizeof(GLushort),
1712                      elementIndices.constData(), GL_STATIC_DRAW);
1713 #endif
1714     } else {
1715 #if defined(QT_OPENGL_DRAWCACHEDGLYPHS_INDEX_ARRAY_VBO)
1716         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elementIndicesVBOId);
1717 #endif
1718     }
1719
1720     setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, (GLfloat*)vertexCoordinates->data());
1721     setVertexAttributePointer(QT_TEXTURE_COORDS_ATTR, (GLfloat*)textureCoordinates->data());
1722
1723     if (!snapToPixelGrid) {
1724         snapToPixelGrid = true;
1725         matrixDirty = true;
1726     }
1727
1728     QBrush pensBrush = q->state()->pen.brush();
1729     setBrush(pensBrush);
1730
1731     if (glyphType == QFontEngineGlyphCache::Raster_RGBMask) {
1732
1733         // Subpixel antialiasing without gamma correction
1734
1735         QPainter::CompositionMode compMode = q->state()->composition_mode;
1736         Q_ASSERT(compMode == QPainter::CompositionMode_Source
1737             || compMode == QPainter::CompositionMode_SourceOver);
1738
1739         shaderManager->setMaskType(QGLEngineShaderManager::SubPixelMaskPass1);
1740
1741         if (pensBrush.style() == Qt::SolidPattern) {
1742             // Solid patterns can get away with only one pass.
1743             QColor c = pensBrush.color();
1744             qreal oldOpacity = q->state()->opacity;
1745             if (compMode == QPainter::CompositionMode_Source) {
1746                 c = qt_premultiplyColor(c, q->state()->opacity);
1747                 q->state()->opacity = 1;
1748                 opacityUniformDirty = true;
1749             }
1750
1751             compositionModeDirty = false; // I can handle this myself, thank you very much
1752             prepareForDraw(false); // Text always causes src pixels to be transparent
1753
1754             // prepareForDraw() have set the opacity on the current shader, so the opacity state can now be reset.
1755             if (compMode == QPainter::CompositionMode_Source) {
1756                 q->state()->opacity = oldOpacity;
1757                 opacityUniformDirty = true;
1758             }
1759
1760             glEnable(GL_BLEND);
1761             glBlendFunc(GL_CONSTANT_COLOR, GL_ONE_MINUS_SRC_COLOR);
1762             glBlendColor(c.redF(), c.greenF(), c.blueF(), c.alphaF());
1763         } else {
1764             // Other brush styles need two passes.
1765
1766             qreal oldOpacity = q->state()->opacity;
1767             if (compMode == QPainter::CompositionMode_Source) {
1768                 q->state()->opacity = 1;
1769                 opacityUniformDirty = true;
1770                 pensBrush = Qt::white;
1771                 setBrush(pensBrush);
1772             }
1773
1774             compositionModeDirty = false; // I can handle this myself, thank you very much
1775             prepareForDraw(false); // Text always causes src pixels to be transparent
1776             glEnable(GL_BLEND);
1777             glBlendFunc(GL_ZERO, GL_ONE_MINUS_SRC_COLOR);
1778
1779             glActiveTexture(GL_TEXTURE0 + QT_MASK_TEXTURE_UNIT);
1780             glBindTexture(GL_TEXTURE_2D, cache->texture());
1781             updateTextureFilter(GL_TEXTURE_2D, GL_REPEAT, false);
1782
1783 #if defined(QT_OPENGL_DRAWCACHEDGLYPHS_INDEX_ARRAY_VBO)
1784             glDrawElements(GL_TRIANGLE_STRIP, 6 * numGlyphs, GL_UNSIGNED_SHORT, 0);
1785 #else
1786             glDrawElements(GL_TRIANGLE_STRIP, 6 * numGlyphs, GL_UNSIGNED_SHORT, elementIndices.data());
1787 #endif
1788
1789             shaderManager->setMaskType(QGLEngineShaderManager::SubPixelMaskPass2);
1790
1791             if (compMode == QPainter::CompositionMode_Source) {
1792                 q->state()->opacity = oldOpacity;
1793                 opacityUniformDirty = true;
1794                 pensBrush = q->state()->pen.brush();
1795                 setBrush(pensBrush);
1796             }
1797
1798             compositionModeDirty = false;
1799             prepareForDraw(false); // Text always causes src pixels to be transparent
1800             glEnable(GL_BLEND);
1801             glBlendFunc(GL_ONE, GL_ONE);
1802         }
1803         compositionModeDirty = true;
1804     } else {
1805         // Greyscale/mono glyphs
1806
1807         shaderManager->setMaskType(QGLEngineShaderManager::PixelMask);
1808         prepareForDraw(false); // Text always causes src pixels to be transparent
1809     }
1810
1811     QGLTextureGlyphCache::FilterMode filterMode = (s->matrix.type() > QTransform::TxTranslate)?QGLTextureGlyphCache::Linear:QGLTextureGlyphCache::Nearest;
1812     if (lastMaskTextureUsed != cache->texture() || cache->filterMode() != filterMode) {
1813
1814         glActiveTexture(GL_TEXTURE0 + QT_MASK_TEXTURE_UNIT);
1815         if (lastMaskTextureUsed != cache->texture()) {
1816             glBindTexture(GL_TEXTURE_2D, cache->texture());
1817             lastMaskTextureUsed = cache->texture();
1818         }
1819
1820         if (cache->filterMode() != filterMode) {
1821             if (filterMode == QGLTextureGlyphCache::Linear) {
1822                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
1823                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1824             } else {
1825                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
1826                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
1827             }
1828             cache->setFilterMode(filterMode);
1829         }
1830     }
1831
1832     bool srgbFrameBufferEnabled = false;
1833     if (ctx->d_ptr->extension_flags & QGLExtensions::SRGBFrameBuffer) {
1834 #if defined(Q_WS_MAC)
1835         if (glyphType == QFontEngineGlyphCache::Raster_RGBMask)
1836 #elif defined(Q_WS_WIN)
1837         if (glyphType != QFontEngineGlyphCache::Raster_RGBMask || fontSmoothingApproximately(2.1))
1838 #else
1839         if (false)
1840 #endif
1841         {
1842             glEnable(FRAMEBUFFER_SRGB_EXT);
1843             srgbFrameBufferEnabled = true;
1844         }
1845     }
1846
1847 #if defined(QT_OPENGL_DRAWCACHEDGLYPHS_INDEX_ARRAY_VBO)
1848     glDrawElements(GL_TRIANGLE_STRIP, 6 * numGlyphs, GL_UNSIGNED_SHORT, 0);
1849     glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
1850 #else
1851     glDrawElements(GL_TRIANGLE_STRIP, 6 * numGlyphs, GL_UNSIGNED_SHORT, elementIndices.data());
1852 #endif
1853
1854     if (srgbFrameBufferEnabled)
1855         glDisable(FRAMEBUFFER_SRGB_EXT);
1856
1857 }
1858
1859 void QGL2PaintEngineEx::drawPixmapFragments(const QPainter::PixmapFragment *fragments, int fragmentCount, const QPixmap &pixmap,
1860                                             QPainter::PixmapFragmentHints hints)
1861 {
1862     Q_D(QGL2PaintEngineEx);
1863     // Use fallback for extended composition modes.
1864     if (state()->composition_mode > QPainter::CompositionMode_Plus) {
1865         QPaintEngineEx::drawPixmapFragments(fragments, fragmentCount, pixmap, hints);
1866         return;
1867     }
1868
1869     ensureActive();
1870     int max_texture_size = d->ctx->d_func()->maxTextureSize();
1871     if (pixmap.width() > max_texture_size || pixmap.height() > max_texture_size) {
1872         QPixmap scaled = pixmap.scaled(max_texture_size, max_texture_size, Qt::KeepAspectRatio);
1873         d->drawPixmapFragments(fragments, fragmentCount, scaled, hints);
1874     } else {
1875         d->drawPixmapFragments(fragments, fragmentCount, pixmap, hints);
1876     }
1877 }
1878
1879
1880 void QGL2PaintEngineExPrivate::drawPixmapFragments(const QPainter::PixmapFragment *fragments,
1881                                                    int fragmentCount, const QPixmap &pixmap,
1882                                                    QPainter::PixmapFragmentHints hints)
1883 {
1884     GLfloat dx = 1.0f / pixmap.size().width();
1885     GLfloat dy = 1.0f / pixmap.size().height();
1886
1887     vertexCoordinateArray.clear();
1888     textureCoordinateArray.clear();
1889     opacityArray.reset();
1890
1891     if (snapToPixelGrid) {
1892         snapToPixelGrid = false;
1893         matrixDirty = true;
1894     }
1895
1896     bool allOpaque = true;
1897
1898     for (int i = 0; i < fragmentCount; ++i) {
1899         qreal s = 0;
1900         qreal c = 1;
1901         if (fragments[i].rotation != 0) {
1902             s = qFastSin(fragments[i].rotation * Q_PI / 180);
1903             c = qFastCos(fragments[i].rotation * Q_PI / 180);
1904         }
1905
1906         qreal right = 0.5 * fragments[i].scaleX * fragments[i].width;
1907         qreal bottom = 0.5 * fragments[i].scaleY * fragments[i].height;
1908         QGLPoint bottomRight(right * c - bottom * s, right * s + bottom * c);
1909         QGLPoint bottomLeft(-right * c - bottom * s, -right * s + bottom * c);
1910
1911         vertexCoordinateArray.addVertex(bottomRight.x + fragments[i].x, bottomRight.y + fragments[i].y);
1912         vertexCoordinateArray.addVertex(-bottomLeft.x + fragments[i].x, -bottomLeft.y + fragments[i].y);
1913         vertexCoordinateArray.addVertex(-bottomRight.x + fragments[i].x, -bottomRight.y + fragments[i].y);
1914         vertexCoordinateArray.addVertex(-bottomRight.x + fragments[i].x, -bottomRight.y + fragments[i].y);
1915         vertexCoordinateArray.addVertex(bottomLeft.x + fragments[i].x, bottomLeft.y + fragments[i].y);
1916         vertexCoordinateArray.addVertex(bottomRight.x + fragments[i].x, bottomRight.y + fragments[i].y);
1917
1918         QGLRect src(fragments[i].sourceLeft * dx, fragments[i].sourceTop * dy,
1919                     (fragments[i].sourceLeft + fragments[i].width) * dx,
1920                     (fragments[i].sourceTop + fragments[i].height) * dy);
1921
1922         textureCoordinateArray.addVertex(src.right, src.bottom);
1923         textureCoordinateArray.addVertex(src.right, src.top);
1924         textureCoordinateArray.addVertex(src.left, src.top);
1925         textureCoordinateArray.addVertex(src.left, src.top);
1926         textureCoordinateArray.addVertex(src.left, src.bottom);
1927         textureCoordinateArray.addVertex(src.right, src.bottom);
1928
1929         qreal opacity = fragments[i].opacity * q->state()->opacity;
1930         opacityArray << opacity << opacity << opacity << opacity << opacity << opacity;
1931         allOpaque &= (opacity >= 0.99f);
1932     }
1933
1934     glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
1935     QGLTexture *texture = ctx->d_func()->bindTexture(pixmap, GL_TEXTURE_2D, GL_RGBA,
1936                                                      QGLContext::InternalBindOption
1937                                                      | QGLContext::CanFlipNativePixmapBindOption);
1938
1939     if (texture->options & QGLContext::InvertedYBindOption) {
1940         // Flip texture y-coordinate.
1941         QGLPoint *data = textureCoordinateArray.data();
1942         for (int i = 0; i < 6 * fragmentCount; ++i)
1943             data[i].y = 1 - data[i].y;
1944     }
1945
1946     transferMode(ImageArrayDrawingMode);
1947
1948     bool isBitmap = pixmap.isQBitmap();
1949     bool isOpaque = !isBitmap && (!pixmap.hasAlpha() || (hints & QPainter::OpaqueHint)) && allOpaque;
1950
1951     updateTextureFilter(GL_TEXTURE_2D, GL_CLAMP_TO_EDGE,
1952                            q->state()->renderHints & QPainter::SmoothPixmapTransform, texture->id);
1953
1954     // Setup for texture drawing
1955     currentBrush = noBrush;
1956     shaderManager->setSrcPixelType(isBitmap ? QGLEngineShaderManager::PatternSrc
1957                                             : QGLEngineShaderManager::ImageSrc);
1958     if (prepareForDraw(isOpaque))
1959         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::ImageTexture), QT_IMAGE_TEXTURE_UNIT);
1960
1961     if (isBitmap) {
1962         QColor col = qt_premultiplyColor(q->state()->pen.color(), (GLfloat)q->state()->opacity);
1963         shaderManager->currentProgram()->setUniformValue(location(QGLEngineShaderManager::PatternColor), col);
1964     }
1965
1966     glDrawArrays(GL_TRIANGLES, 0, 6 * fragmentCount);
1967 }
1968
1969 bool QGL2PaintEngineEx::begin(QPaintDevice *pdev)
1970 {
1971     Q_D(QGL2PaintEngineEx);
1972
1973 //     qDebug("QGL2PaintEngineEx::begin()");
1974     if (pdev->devType() == QInternal::OpenGL)
1975         d->device = static_cast<QGLPaintDevice*>(pdev);
1976     else
1977         d->device = QGLPaintDevice::getDevice(pdev);
1978
1979     if (!d->device)
1980         return false;
1981
1982     d->ctx = d->device->context();
1983     d->ctx->d_ptr->active_engine = this;
1984
1985     const QSize sz = d->device->size();
1986     d->width = sz.width();
1987     d->height = sz.height();
1988     d->mode = BrushDrawingMode;
1989     d->brushTextureDirty = true;
1990     d->brushUniformsDirty = true;
1991     d->matrixUniformDirty = true;
1992     d->matrixDirty = true;
1993     d->compositionModeDirty = true;
1994     d->opacityUniformDirty = true;
1995     d->needsSync = true;
1996     d->useSystemClip = !systemClip().isEmpty();
1997     d->currentBrush = QBrush();
1998
1999     d->dirtyStencilRegion = QRect(0, 0, d->width, d->height);
2000     d->stencilClean = true;
2001
2002     // Calling begin paint should make the correct context current. So, any
2003     // code which calls into GL or otherwise needs a current context *must*
2004     // go after beginPaint:
2005     d->device->beginPaint();
2006
2007 #if !defined(QT_OPENGL_ES_2)
2008     bool success = qt_resolve_version_2_0_functions(d->ctx)
2009                    && qt_resolve_buffer_extensions(d->ctx);
2010     Q_ASSERT(success);
2011     Q_UNUSED(success);
2012 #endif
2013
2014     d->shaderManager = new QGLEngineShaderManager(d->ctx);
2015
2016     glDisable(GL_STENCIL_TEST);
2017     glDisable(GL_DEPTH_TEST);
2018     glDisable(GL_SCISSOR_TEST);
2019
2020 #if !defined(QT_OPENGL_ES_2)
2021     glDisable(GL_MULTISAMPLE);
2022 #endif
2023
2024     d->glyphCacheType = QFontEngineGlyphCache::Raster_A8;
2025
2026 #if !defined(QT_OPENGL_ES_2)
2027 #if defined(Q_WS_WIN)
2028     if (qt_cleartype_enabled
2029         && (fontSmoothingApproximately(1.0) || fontSmoothingApproximately(2.1)))
2030 #endif
2031 #if defined(Q_WS_MAC)
2032     if (qt_applefontsmoothing_enabled)
2033 #endif
2034         d->glyphCacheType = QFontEngineGlyphCache::Raster_RGBMask;
2035 #endif
2036
2037 #if defined(QT_OPENGL_ES_2)
2038     // OpenGL ES can't switch MSAA off, so if the gl paint device is
2039     // multisampled, it's always multisampled.
2040     d->multisamplingAlwaysEnabled = d->device->format().sampleBuffers();
2041 #else
2042     d->multisamplingAlwaysEnabled = false;
2043 #endif
2044
2045     return true;
2046 }
2047
2048 bool QGL2PaintEngineEx::end()
2049 {
2050     Q_D(QGL2PaintEngineEx);
2051
2052     QGLContext *ctx = d->ctx;
2053     glUseProgram(0);
2054     d->transferMode(BrushDrawingMode);
2055     d->device->endPaint();
2056
2057     ctx->d_ptr->active_engine = 0;
2058
2059     d->resetGLState();
2060
2061     delete d->shaderManager;
2062     d->shaderManager = 0;
2063     d->currentBrush = QBrush();
2064
2065 #ifdef QT_OPENGL_CACHE_AS_VBOS
2066     if (!d->unusedVBOSToClean.isEmpty()) {
2067         glDeleteBuffers(d->unusedVBOSToClean.size(), d->unusedVBOSToClean.constData());
2068         d->unusedVBOSToClean.clear();
2069     }
2070     if (!d->unusedIBOSToClean.isEmpty()) {
2071         glDeleteBuffers(d->unusedIBOSToClean.size(), d->unusedIBOSToClean.constData());
2072         d->unusedIBOSToClean.clear();
2073     }
2074 #endif
2075
2076     return false;
2077 }
2078
2079 void QGL2PaintEngineEx::ensureActive()
2080 {
2081     Q_D(QGL2PaintEngineEx);
2082     QGLContext *ctx = d->ctx;
2083
2084     if (isActive() && ctx->d_ptr->active_engine != this) {
2085         ctx->d_ptr->active_engine = this;
2086         d->needsSync = true;
2087     }
2088
2089     d->device->ensureActiveTarget();
2090
2091     if (d->needsSync) {
2092         d->transferMode(BrushDrawingMode);
2093         glViewport(0, 0, d->width, d->height);
2094         d->needsSync = false;
2095         d->lastMaskTextureUsed = 0;
2096         d->shaderManager->setDirty();
2097         d->ctx->d_func()->syncGlState();
2098         for (int i = 0; i < 3; ++i)
2099             d->vertexAttribPointers[i] = (GLfloat*)-1; // Assume the pointers are clobbered
2100         setState(state());
2101     }
2102 }
2103
2104 void QGL2PaintEngineExPrivate::updateClipScissorTest()
2105 {
2106     Q_Q(QGL2PaintEngineEx);
2107     if (q->state()->clipTestEnabled) {
2108         glEnable(GL_STENCIL_TEST);
2109         glStencilFunc(GL_LEQUAL, q->state()->currentClip, ~GL_STENCIL_HIGH_BIT);
2110     } else {
2111         glDisable(GL_STENCIL_TEST);
2112         glStencilFunc(GL_ALWAYS, 0, 0xff);
2113     }
2114
2115 #ifdef QT_GL_NO_SCISSOR_TEST
2116     currentScissorBounds = QRect(0, 0, width, height);
2117 #else
2118     QRect bounds = q->state()->rectangleClip;
2119     if (!q->state()->clipEnabled) {
2120         if (useSystemClip)
2121             bounds = systemClip.boundingRect();
2122         else
2123             bounds = QRect(0, 0, width, height);
2124     } else {
2125         if (useSystemClip)
2126             bounds = bounds.intersected(systemClip.boundingRect());
2127         else
2128             bounds = bounds.intersected(QRect(0, 0, width, height));
2129     }
2130
2131     currentScissorBounds = bounds;
2132
2133     if (bounds == QRect(0, 0, width, height)) {
2134         glDisable(GL_SCISSOR_TEST);
2135     } else {
2136         glEnable(GL_SCISSOR_TEST);
2137         setScissor(bounds);
2138     }
2139 #endif
2140 }
2141
2142 void QGL2PaintEngineExPrivate::setScissor(const QRect &rect)
2143 {
2144     const int left = rect.left();
2145     const int width = rect.width();
2146     int bottom = height - (rect.top() + rect.height());
2147     if (device->isFlipped()) {
2148         bottom = rect.top();
2149     }
2150     const int height = rect.height();
2151
2152     glScissor(left, bottom, width, height);
2153 }
2154
2155 void QGL2PaintEngineEx::clipEnabledChanged()
2156 {
2157     Q_D(QGL2PaintEngineEx);
2158
2159     state()->clipChanged = true;
2160
2161     if (painter()->hasClipping())
2162         d->regenerateClip();
2163     else
2164         d->systemStateChanged();
2165 }
2166
2167 void QGL2PaintEngineExPrivate::clearClip(uint value)
2168 {
2169     dirtyStencilRegion -= currentScissorBounds;
2170
2171     glStencilMask(0xff);
2172     glClearStencil(value);
2173     glClear(GL_STENCIL_BUFFER_BIT);
2174     glStencilMask(0x0);
2175
2176     q->state()->needsClipBufferClear = false;
2177 }
2178
2179 void QGL2PaintEngineExPrivate::writeClip(const QVectorPath &path, uint value)
2180 {
2181     transferMode(BrushDrawingMode);
2182
2183     if (snapToPixelGrid) {
2184         snapToPixelGrid = false;
2185         matrixDirty = true;
2186     }
2187
2188     if (matrixDirty)
2189         updateMatrix();
2190
2191     stencilClean = false;
2192
2193     const bool singlePass = !path.hasWindingFill()
2194         && (((q->state()->currentClip == maxClip - 1) && q->state()->clipTestEnabled)
2195             || q->state()->needsClipBufferClear);
2196     const uint referenceClipValue = q->state()->needsClipBufferClear ? 1 : q->state()->currentClip;
2197
2198     if (q->state()->needsClipBufferClear)
2199         clearClip(1);
2200
2201     if (path.isEmpty()) {
2202         glEnable(GL_STENCIL_TEST);
2203         glStencilFunc(GL_LEQUAL, value, ~GL_STENCIL_HIGH_BIT);
2204         return;
2205     }
2206
2207     if (q->state()->clipTestEnabled)
2208         glStencilFunc(GL_LEQUAL, q->state()->currentClip, ~GL_STENCIL_HIGH_BIT);
2209     else
2210         glStencilFunc(GL_ALWAYS, 0, 0xff);
2211
2212     vertexCoordinateArray.clear();
2213     vertexCoordinateArray.addPath(path, inverseScale, false);
2214
2215     if (!singlePass)
2216         fillStencilWithVertexArray(vertexCoordinateArray, path.hasWindingFill());
2217
2218     glColorMask(false, false, false, false);
2219     glEnable(GL_STENCIL_TEST);
2220     useSimpleShader();
2221
2222     if (singlePass) {
2223         // Under these conditions we can set the new stencil value in a single
2224         // pass, by using the current value and the "new value" as the toggles
2225
2226         glStencilFunc(GL_LEQUAL, referenceClipValue, ~GL_STENCIL_HIGH_BIT);
2227         glStencilOp(GL_KEEP, GL_INVERT, GL_INVERT);
2228         glStencilMask(value ^ referenceClipValue);
2229
2230         drawVertexArrays(vertexCoordinateArray, GL_TRIANGLE_FAN);
2231     } else {
2232         glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE);
2233         glStencilMask(0xff);
2234
2235         if (!q->state()->clipTestEnabled && path.hasWindingFill()) {
2236             // Pass when any clip bit is set, set high bit
2237             glStencilFunc(GL_NOTEQUAL, GL_STENCIL_HIGH_BIT, ~GL_STENCIL_HIGH_BIT);
2238             composite(vertexCoordinateArray.boundingRect());
2239         }
2240
2241         // Pass when high bit is set, replace stencil value with new clip value
2242         glStencilFunc(GL_NOTEQUAL, value, GL_STENCIL_HIGH_BIT);
2243
2244         composite(vertexCoordinateArray.boundingRect());
2245     }
2246
2247     glStencilFunc(GL_LEQUAL, value, ~GL_STENCIL_HIGH_BIT);
2248     glStencilMask(0);
2249
2250     glColorMask(true, true, true, true);
2251 }
2252
2253 void QGL2PaintEngineEx::clip(const QVectorPath &path, Qt::ClipOperation op)
2254 {
2255 //     qDebug("QGL2PaintEngineEx::clip()");
2256     Q_D(QGL2PaintEngineEx);
2257
2258     state()->clipChanged = true;
2259
2260     ensureActive();
2261
2262     if (op == Qt::ReplaceClip) {
2263         op = Qt::IntersectClip;
2264         if (d->hasClipOperations()) {
2265             d->systemStateChanged();
2266             state()->canRestoreClip = false;
2267         }
2268     }
2269
2270 #ifndef QT_GL_NO_SCISSOR_TEST
2271     if (!path.isEmpty() && op == Qt::IntersectClip && (path.shape() == QVectorPath::RectangleHint)) {
2272         const QPointF* const points = reinterpret_cast<const QPointF*>(path.points());
2273         QRectF rect(points[0], points[2]);
2274
2275         if (state()->matrix.type() <= QTransform::TxScale
2276             || (state()->matrix.type() == QTransform::TxRotate
2277                 && qFuzzyIsNull(state()->matrix.m11())
2278                 && qFuzzyIsNull(state()->matrix.m22())))
2279         {
2280             state()->rectangleClip = state()->rectangleClip.intersected(state()->matrix.mapRect(rect).toRect());
2281             d->updateClipScissorTest();
2282             return;
2283         }
2284     }
2285 #endif
2286
2287     const QRect pathRect = state()->matrix.mapRect(path.controlPointRect()).toAlignedRect();
2288
2289     switch (op) {
2290     case Qt::NoClip:
2291         if (d->useSystemClip) {
2292             state()->clipTestEnabled = true;
2293             state()->currentClip = 1;
2294         } else {
2295             state()->clipTestEnabled = false;
2296         }
2297         state()->rectangleClip = QRect(0, 0, d->width, d->height);
2298         state()->canRestoreClip = false;
2299         d->updateClipScissorTest();
2300         break;
2301     case Qt::IntersectClip:
2302         state()->rectangleClip = state()->rectangleClip.intersected(pathRect);
2303         d->updateClipScissorTest();
2304         d->resetClipIfNeeded();
2305         ++d->maxClip;
2306         d->writeClip(path, d->maxClip);
2307         state()->currentClip = d->maxClip;
2308         state()->clipTestEnabled = true;
2309         break;
2310     default:
2311         break;
2312     }
2313 }
2314
2315 void QGL2PaintEngineExPrivate::regenerateClip()
2316 {
2317     systemStateChanged();
2318     replayClipOperations();
2319 }
2320
2321 void QGL2PaintEngineExPrivate::systemStateChanged()
2322 {
2323     Q_Q(QGL2PaintEngineEx);
2324
2325     q->state()->clipChanged = true;
2326
2327     if (systemClip.isEmpty()) {
2328         useSystemClip = false;
2329     } else {
2330         if (q->paintDevice()->devType() == QInternal::Widget && currentClipDevice) {
2331             QWidgetPrivate *widgetPrivate = qt_widget_private(static_cast<QWidget *>(currentClipDevice)->window());
2332             useSystemClip = widgetPrivate->extra && widgetPrivate->extra->inRenderWithPainter;
2333         } else {
2334             useSystemClip = true;
2335         }
2336     }
2337
2338     q->state()->clipTestEnabled = false;
2339     q->state()->needsClipBufferClear = true;
2340
2341     q->state()->currentClip = 1;
2342     maxClip = 1;
2343
2344     q->state()->rectangleClip = useSystemClip ? systemClip.boundingRect() : QRect(0, 0, width, height);
2345     updateClipScissorTest();
2346
2347     if (systemClip.rectCount() == 1) {
2348         if (systemClip.boundingRect() == QRect(0, 0, width, height))
2349             useSystemClip = false;
2350 #ifndef QT_GL_NO_SCISSOR_TEST
2351         // scissoring takes care of the system clip
2352         return;
2353 #endif
2354     }
2355
2356     if (useSystemClip) {
2357         clearClip(0);
2358
2359         QPainterPath path;
2360         path.addRegion(systemClip);
2361
2362         q->state()->currentClip = 0;
2363         writeClip(qtVectorPathForPath(q->state()->matrix.inverted().map(path)), 1);
2364         q->state()->currentClip = 1;
2365         q->state()->clipTestEnabled = true;
2366     }
2367 }
2368
2369 void QGL2PaintEngineEx::setState(QPainterState *new_state)
2370 {
2371     //     qDebug("QGL2PaintEngineEx::setState()");
2372
2373     Q_D(QGL2PaintEngineEx);
2374
2375     QOpenGL2PaintEngineState *s = static_cast<QOpenGL2PaintEngineState *>(new_state);
2376     QOpenGL2PaintEngineState *old_state = state();
2377
2378     QPaintEngineEx::setState(s);
2379
2380     if (s->isNew) {
2381         // Newly created state object.  The call to setState()
2382         // will either be followed by a call to begin(), or we are
2383         // setting the state as part of a save().
2384         s->isNew = false;
2385         return;
2386     }
2387
2388     // Setting the state as part of a restore().
2389
2390     if (old_state == s || old_state->renderHintsChanged)
2391         renderHintsChanged();
2392
2393     if (old_state == s || old_state->matrixChanged)
2394         d->matrixDirty = true;
2395
2396     if (old_state == s || old_state->compositionModeChanged)
2397         d->compositionModeDirty = true;
2398
2399     if (old_state == s || old_state->opacityChanged)
2400         d->opacityUniformDirty = true;
2401
2402     if (old_state == s || old_state->clipChanged) {
2403         if (old_state && old_state != s && old_state->canRestoreClip) {
2404             d->updateClipScissorTest();
2405             glDepthFunc(GL_LEQUAL);
2406         } else {
2407             d->regenerateClip();
2408         }
2409     }
2410 }
2411
2412 QPainterState *QGL2PaintEngineEx::createState(QPainterState *orig) const
2413 {
2414     if (orig)
2415         const_cast<QGL2PaintEngineEx *>(this)->ensureActive();
2416
2417     QOpenGL2PaintEngineState *s;
2418     if (!orig)
2419         s = new QOpenGL2PaintEngineState();
2420     else
2421         s = new QOpenGL2PaintEngineState(*static_cast<QOpenGL2PaintEngineState *>(orig));
2422
2423     s->matrixChanged = false;
2424     s->compositionModeChanged = false;
2425     s->opacityChanged = false;
2426     s->renderHintsChanged = false;
2427     s->clipChanged = false;
2428
2429     return s;
2430 }
2431
2432 QOpenGL2PaintEngineState::QOpenGL2PaintEngineState(QOpenGL2PaintEngineState &other)
2433     : QPainterState(other)
2434 {
2435     isNew = true;
2436     needsClipBufferClear = other.needsClipBufferClear;
2437     clipTestEnabled = other.clipTestEnabled;
2438     currentClip = other.currentClip;
2439     canRestoreClip = other.canRestoreClip;
2440     rectangleClip = other.rectangleClip;
2441 }
2442
2443 QOpenGL2PaintEngineState::QOpenGL2PaintEngineState()
2444 {
2445     isNew = true;
2446     needsClipBufferClear = true;
2447     clipTestEnabled = false;
2448     canRestoreClip = true;
2449 }
2450
2451 QOpenGL2PaintEngineState::~QOpenGL2PaintEngineState()
2452 {
2453 }
2454
2455 QT_END_NAMESPACE