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39
40	/*
41	When the active program changes, we need to update it's uniforms.
42	We could track state for each program and only update stale uniforms
43	- Could lead to lots of overhead if there's a lot of programs
44	We could update all the uniforms when the program changes
45	- Could end up updating lots of uniforms which don't need updating
46
47	Updating uniforms should be cheap, so the overhead of updating up-to-date
48	uniforms should be minimal. It's also less complex.
49
50	Things which _may_ cause a different program to be used:
51	- Change in brush/pen style
52	- Change in painter opacity
53	- Change in composition mode
54
55	Whenever we set a mode on the shader manager - it needs to tell us if it had
56	to switch to a different program.
57
58	The shader manager should only switch when we tell it to. E.g. if we set a new
59	brush style and then switch to transparent painter, we only want it to compile
60	and use the correct program when we really need it.
61	*/
62
63	// #define QT_OPENGL_CACHE_AS_VBOS
64
65	#include "qglgradientcache_p.h"
66	#include "qpaintengineex_opengl2_p.h"
67
68	#include <string.h> //for memcpy
69	#include <qmath.h>
70
71	#include <private/qgl_p.h>
72	#include <private/qpaintengineex_p.h>
73	#include <QPaintEngine>
74	#include <private/qpainter_p.h>
75	#include <private/qfontengine_p.h>
76	#include <private/qdatabuffer_p.h>
77	#include <private/qstatictext_p.h>
78	#include <QtGui/private/qtriangulator_p.h>
79
80	#include "qglengineshadermanager_p.h"
81	#include "qgl2pexvertexarray_p.h"
82	#include "qtextureglyphcache_gl_p.h"
83
84	#include <QDebug>
85
86	#ifndef QT_OPENGL_ES_2
87	# include <qopenglfunctions_1_1.h>
88	#endif
89
90	QT_BEGIN_NAMESPACE
91
92
93
94	Q_GUI_EXPORT QImage qt_imageForBrush(int brushStyle, bool invert);
95
96	////////////////////////////////// Private Methods //////////////////////////////////////////
97
98	QGL2PaintEngineExPrivate::~QGL2PaintEngineExPrivate()
99	{
100	delete shaderManager;
101
102	while (pathCaches.size()) {
103	QVectorPath::CacheEntry *e = *(pathCaches.constBegin());
104	e->cleanup(e->engine, e->data);
105	e->data = 0;
106	e->engine = 0;
107	}
108
109	if (elementIndicesVBOId != 0) {
110	glDeleteBuffers(n: 1, buffers: &elementIndicesVBOId);
111	elementIndicesVBOId = 0;
112	}
113	}
114
115	void QGL2PaintEngineExPrivate::updateTextureFilter(GLenum target, GLenum wrapMode, bool smoothPixmapTransform, GLuint id)
116	{
117	// glActiveTexture(GL_TEXTURE0 + QT_BRUSH_TEXTURE_UNIT); //### Is it always this texture unit?
118	if (id != GLuint(-1) && id == lastTextureUsed)
119	return;
120
121	lastTextureUsed = id;
122
123	if (smoothPixmapTransform) {
124	glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
125	glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
126	} else {
127	glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
128	glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
129	}
130	glTexParameteri(target, GL_TEXTURE_WRAP_S, param: wrapMode);
131	glTexParameteri(target, GL_TEXTURE_WRAP_T, param: wrapMode);
132	}
133
134
135	inline QColor qt_premultiplyColor(QColor c, GLfloat opacity)
136	{
137	qreal alpha = c.alphaF() * opacity;
138	c.setAlphaF(alpha);
139	c.setRedF(c.redF() * alpha);
140	c.setGreenF(c.greenF() * alpha);
141	c.setBlueF(c.blueF() * alpha);
142	return c;
143	}
144
145
146	void QGL2PaintEngineExPrivate::setBrush(const QBrush& brush)
147	{
148	if (qbrush_fast_equals(a: currentBrush, b: brush))
149	return;
150
151	const Qt::BrushStyle newStyle = qbrush_style(b: brush);
152	Q_ASSERT(newStyle != Qt::NoBrush);
153
154	currentBrush = brush;
155	if (!currentBrushPixmap.isNull())
156	currentBrushPixmap = QPixmap();
157	brushUniformsDirty = true; // All brushes have at least one uniform
158
159	if (newStyle > Qt::SolidPattern)
160	brushTextureDirty = true;
161
162	if (currentBrush.style() == Qt::TexturePattern
163	&& qHasPixmapTexture(brush) && brush.texture().isQBitmap())
164	{
165	shaderManager->setSrcPixelType(QGLEngineShaderManager::TextureSrcWithPattern);
166	} else {
167	shaderManager->setSrcPixelType(newStyle);
168	}
169	shaderManager->optimiseForBrushTransform(transformType: currentBrush.transform().type());
170	}
171
172
173	void QGL2PaintEngineExPrivate::useSimpleShader()
174	{
175	shaderManager->useSimpleProgram();
176
177	if (matrixDirty)
178	updateMatrix();
179	}
180
181	// ####TODO Properly #ifdef this class to use #define symbols actually defined
182	// by OpenGL/ES includes
183	#ifndef GL_MIRRORED_REPEAT_IBM
184	#define GL_MIRRORED_REPEAT_IBM 0x8370
185	#endif
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(brushStyle: style, invert: false);
196
197	glActiveTexture(GL_TEXTURE0 + QT_BRUSH_TEXTURE_UNIT);
198	ctx->d_func()->bindTexture(image: texImage, GL_TEXTURE_2D, GL_RGBA, options: QGLContext::InternalBindOption);
199	updateTextureFilter(GL_TEXTURE_2D, GL_REPEAT, smoothPixmapTransform: 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(context: ctx)->getBuffer(gradient: *g, opacity: 1.0);
209
210	glActiveTexture(GL_TEXTURE0 + QT_BRUSH_TEXTURE_UNIT);
211	glBindTexture(GL_TEXTURE_2D, texture: texId);
212
213	if (g->spread() == QGradient::RepeatSpread || g->type() == QGradient::ConicalGradient)
214	updateTextureFilter(GL_TEXTURE_2D, GL_REPEAT, smoothPixmapTransform: q->state()->renderHints & QPainter::SmoothPixmapTransform);
215	else if (g->spread() == QGradient::ReflectSpread)
216	updateTextureFilter(GL_TEXTURE_2D, GL_MIRRORED_REPEAT_IBM, smoothPixmapTransform: q->state()->renderHints & QPainter::SmoothPixmapTransform);
217	else
218	updateTextureFilter(GL_TEXTURE_2D, GL_CLAMP_TO_EDGE, smoothPixmapTransform: 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(w: max_texture_size, h: max_texture_size, aspectMode: Qt::KeepAspectRatio);
226
227	GLuint wrapMode = GL_REPEAT;
228	if (ctx->contextHandle()->isOpenGLES()) {
229	// OpenGL ES does not support GL_REPEAT wrap modes for NPOT textures. So instead,
230	// we emulate GL_REPEAT by only taking the fractional part of the texture coords
231	// in the qopenglslTextureBrushSrcFragmentShader program.
232	wrapMode = GL_CLAMP_TO_EDGE;
233	}
234
235	glActiveTexture(GL_TEXTURE0 + QT_BRUSH_TEXTURE_UNIT);
236	QGLTexture *tex = ctx->d_func()->bindTexture(pixmap: currentBrushPixmap, GL_TEXTURE_2D, GL_RGBA,
237	options: QGLContext::InternalBindOption |
238	QGLContext::CanFlipNativePixmapBindOption);
239	updateTextureFilter(GL_TEXTURE_2D, wrapMode, smoothPixmapTransform: q->state()->renderHints & QPainter::SmoothPixmapTransform);
240	textureInvertedY = tex->options & QGLContext::InvertedYBindOption ? -1 : 1;
241	}
242	brushTextureDirty = false;
243	}
244
245
246	void QGL2PaintEngineExPrivate::updateBrushUniforms()
247	{
248	// qDebug("QGL2PaintEngineExPrivate::updateBrushUniforms()");
249	Qt::BrushStyle style = currentBrush.style();
250
251	if (style == Qt::NoBrush)
252	return;
253
254	QTransform brushQTransform = currentBrush.transform();
255
256	if (style == Qt::SolidPattern) {
257	QColor col = qt_premultiplyColor(c: currentBrush.color(), opacity: (GLfloat)q->state()->opacity);
258	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::FragmentColor), color: col);
259	}
260	else {
261	// All other brushes have a transform and thus need the translation point:
262	QPointF translationPoint;
263
264	if (style <= Qt::DiagCrossPattern) {
265	QColor col = qt_premultiplyColor(c: currentBrush.color(), opacity: (GLfloat)q->state()->opacity);
266
267	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::PatternColor), color: col);
268
269	QVector2D halfViewportSize(width*0.5, height*0.5);
270	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::HalfViewportSize), value: halfViewportSize);
271	}
272	else if (style == Qt::LinearGradientPattern) {
273	const QLinearGradient *g = static_cast<const QLinearGradient *>(currentBrush.gradient());
274
275	QPointF realStart = g->start();
276	QPointF realFinal = g->finalStop();
277	translationPoint = realStart;
278
279	QPointF l = realFinal - realStart;
280
281	QVector3D linearData(
282	l.x(),
283	l.y(),
284	1.0f / (l.x() * l.x() + l.y() * l.y())
285	);
286
287	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::LinearData), value: linearData);
288
289	QVector2D halfViewportSize(width*0.5, height*0.5);
290	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::HalfViewportSize), value: halfViewportSize);
291	}
292	else if (style == Qt::ConicalGradientPattern) {
293	const QConicalGradient *g = static_cast<const QConicalGradient *>(currentBrush.gradient());
294	translationPoint = g->center();
295
296	GLfloat angle = -qDegreesToRadians(degrees: g->angle());
297
298	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::Angle), value: angle);
299
300	QVector2D halfViewportSize(width*0.5, height*0.5);
301	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::HalfViewportSize), value: halfViewportSize);
302	}
303	else if (style == Qt::RadialGradientPattern) {
304	const QRadialGradient *g = static_cast<const QRadialGradient *>(currentBrush.gradient());
305	QPointF realCenter = g->center();
306	QPointF realFocal = g->focalPoint();
307	qreal realRadius = g->centerRadius() - g->focalRadius();
308	translationPoint = realFocal;
309
310	QPointF fmp = realCenter - realFocal;
311	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::Fmp), point: fmp);
312
313	GLfloat fmp2_m_radius2 = -fmp.x() * fmp.x() - fmp.y() * fmp.y() + realRadius*realRadius;
314	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::Fmp2MRadius2), value: fmp2_m_radius2);
315	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::Inverse2Fmp2MRadius2),
316	value: GLfloat(1.0 / (2.0*fmp2_m_radius2)));
317	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::SqrFr),
318	value: GLfloat(g->focalRadius() * g->focalRadius()));
319	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::BRadius),
320	x: GLfloat(2 * (g->centerRadius() - g->focalRadius()) * g->focalRadius()),
321	y: g->focalRadius(),
322	z: g->centerRadius() - g->focalRadius());
323
324	QVector2D halfViewportSize(width*0.5, height*0.5);
325	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::HalfViewportSize), value: halfViewportSize);
326	}
327	else if (style == Qt::TexturePattern) {
328	const QPixmap& texPixmap = currentBrush.texture();
329
330	if (qHasPixmapTexture(brush: currentBrush) && currentBrush.texture().isQBitmap()) {
331	QColor col = qt_premultiplyColor(c: currentBrush.color(), opacity: (GLfloat)q->state()->opacity);
332	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::PatternColor), color: col);
333	}
334
335	QSizeF invertedTextureSize(1.0 / texPixmap.width(), 1.0 / texPixmap.height());
336	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::InvertedTextureSize), size: invertedTextureSize);
337
338	QVector2D halfViewportSize(width*0.5, height*0.5);
339	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::HalfViewportSize), value: halfViewportSize);
340	}
341	else
342	qWarning(msg: "QGL2PaintEngineEx: Unimplemented fill style");
343
344	const QPointF &brushOrigin = q->state()->brushOrigin;
345	QTransform matrix = q->state()->matrix;
346	matrix.translate(dx: brushOrigin.x(), dy: brushOrigin.y());
347
348	QTransform translate(1, 0, 0, 1, -translationPoint.x(), -translationPoint.y());
349	qreal m22 = -1;
350	qreal dy = height;
351	if (device->isFlipped()) {
352	m22 = 1;
353	dy = 0;
354	}
355	QTransform gl_to_qt(1, 0, 0, m22, 0, dy);
356	QTransform inv_matrix;
357	if (style == Qt::TexturePattern && textureInvertedY == -1)
358	inv_matrix = gl_to_qt * (QTransform(1, 0, 0, -1, 0, currentBrush.texture().height()) * brushQTransform * matrix).inverted() * translate;
359	else
360	inv_matrix = gl_to_qt * (brushQTransform * matrix).inverted() * translate;
361
362	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::BrushTransform), value: inv_matrix);
363	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::BrushTexture), QT_BRUSH_TEXTURE_UNIT);
364	}
365	brushUniformsDirty = false;
366	}
367
368
369	// This assumes the shader manager has already setup the correct shader program
370	void QGL2PaintEngineExPrivate::updateMatrix()
371	{
372	// qDebug("QGL2PaintEngineExPrivate::updateMatrix()");
373
374	const QTransform& transform = q->state()->matrix;
375
376	// The projection matrix converts from Qt's coordinate system to GL's coordinate system
377	// * GL's viewport is 2x2, Qt's is width x height
378	// * GL has +y -> -y going from bottom -> top, Qt is the other way round
379	// * GL has [0,0] in the center, Qt has it in the top-left
380	//
381	// This results in the Projection matrix below, which is multiplied by the painter's
382	// transformation matrix, as shown below:
383	//
384	// Projection Matrix Painter Transform
385	// ------------------------------------------------ ------------------------
386	// | 2.0 / width | 0.0 | -1.0 | | m11 | m21 | dx |
387	// | 0.0 | -2.0 / height | 1.0 | * | m12 | m22 | dy |
388	// | 0.0 | 0.0 | 1.0 | | m13 | m23 | m33 |
389	// ------------------------------------------------ ------------------------
390	//
391	// NOTE: The resultant matrix is also transposed, as GL expects column-major matracies
392
393	const GLfloat wfactor = 2.0f / width;
394	GLfloat hfactor = -2.0f / height;
395
396	GLfloat dx = transform.dx();
397	GLfloat dy = transform.dy();
398
399	if (device->isFlipped()) {
400	hfactor *= -1;
401	dy -= height;
402	}
403
404	// Non-integer translates can have strange effects for some rendering operations such as
405	// anti-aliased text rendering. In such cases, we snap the translate to the pixel grid.
406	if (snapToPixelGrid && transform.type() == QTransform::TxTranslate) {
407	// 0.50 needs to rounded down to 0.0 for consistency with raster engine:
408	dx = std::ceil(x: dx - 0.5f);
409	dy = std::ceil(x: dy - 0.5f);
410	}
411	pmvMatrix[0][0] = (wfactor * transform.m11()) - transform.m13();
412	pmvMatrix[1][0] = (wfactor * transform.m21()) - transform.m23();
413	pmvMatrix[2][0] = (wfactor * dx) - transform.m33();
414	pmvMatrix[0][1] = (hfactor * transform.m12()) + transform.m13();
415	pmvMatrix[1][1] = (hfactor * transform.m22()) + transform.m23();
416	pmvMatrix[2][1] = (hfactor * dy) + transform.m33();
417	pmvMatrix[0][2] = transform.m13();
418	pmvMatrix[1][2] = transform.m23();
419	pmvMatrix[2][2] = transform.m33();
420
421	// 1/10000 == 0.0001, so we have good enough res to cover curves
422	// that span the entire widget...
423	inverseScale = qMax(a: 1 / qMax( a: qMax(a: qAbs(t: transform.m11()), b: qAbs(t: transform.m22())),
424	b: qMax(a: qAbs(t: transform.m12()), b: qAbs(t: transform.m21())) ),
425	b: qreal(0.0001));
426
427	matrixDirty = false;
428	matrixUniformDirty = true;
429
430	// Set the PMV matrix attribute. As we use an attributes rather than uniforms, we only
431	// need to do this once for every matrix change and persists across all shader programs.
432	glVertexAttrib3fv(indx: QT_PMV_MATRIX_1_ATTR, values: pmvMatrix[0]);
433	glVertexAttrib3fv(indx: QT_PMV_MATRIX_2_ATTR, values: pmvMatrix[1]);
434	glVertexAttrib3fv(indx: QT_PMV_MATRIX_3_ATTR, values: pmvMatrix[2]);
435
436	dasher.setInvScale(inverseScale);
437	stroker.setInvScale(inverseScale);
438	}
439
440
441	void QGL2PaintEngineExPrivate::updateCompositionMode()
442	{
443	// NOTE: The entire paint engine works on pre-multiplied data - which is why some of these
444	// composition modes look odd.
445	// qDebug() << "QGL2PaintEngineExPrivate::updateCompositionMode() - Setting GL composition mode for " << q->state()->composition_mode;
446	switch(q->state()->composition_mode) {
447	case QPainter::CompositionMode_SourceOver:
448	glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
449	break;
450	case QPainter::CompositionMode_DestinationOver:
451	glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_ONE);
452	break;
453	case QPainter::CompositionMode_Clear:
454	glBlendFunc(GL_ZERO, GL_ZERO);
455	break;
456	case QPainter::CompositionMode_Source:
457	glBlendFunc(GL_ONE, GL_ZERO);
458	break;
459	case QPainter::CompositionMode_Destination:
460	glBlendFunc(GL_ZERO, GL_ONE);
461	break;
462	case QPainter::CompositionMode_SourceIn:
463	glBlendFunc(GL_DST_ALPHA, GL_ZERO);
464	break;
465	case QPainter::CompositionMode_DestinationIn:
466	glBlendFunc(GL_ZERO, GL_SRC_ALPHA);
467	break;
468	case QPainter::CompositionMode_SourceOut:
469	glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_ZERO);
470	break;
471	case QPainter::CompositionMode_DestinationOut:
472	glBlendFunc(GL_ZERO, GL_ONE_MINUS_SRC_ALPHA);
473	break;
474	case QPainter::CompositionMode_SourceAtop:
475	glBlendFunc(GL_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
476	break;
477	case QPainter::CompositionMode_DestinationAtop:
478	glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_SRC_ALPHA);
479	break;
480	case QPainter::CompositionMode_Xor:
481	glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
482	break;
483	case QPainter::CompositionMode_Plus:
484	glBlendFunc(GL_ONE, GL_ONE);
485	break;
486	default:
487	qWarning(msg: "Unsupported composition mode");
488	break;
489	}
490
491	compositionModeDirty = false;
492	}
493
494	static inline void setCoords(GLfloat *coords, const QGLRect &rect)
495	{
496	coords[0] = rect.left;
497	coords[1] = rect.top;
498	coords[2] = rect.right;
499	coords[3] = rect.top;
500	coords[4] = rect.right;
501	coords[5] = rect.bottom;
502	coords[6] = rect.left;
503	coords[7] = rect.bottom;
504	}
505
506	void QGL2PaintEngineExPrivate::drawTexture(const QGLRect& dest, const QGLRect& src, const QSize &textureSize, bool opaque, bool pattern)
507	{
508	// Setup for texture drawing
509	currentBrush = noBrush;
510	shaderManager->setSrcPixelType(pattern ? QGLEngineShaderManager::PatternSrc : QGLEngineShaderManager::ImageSrc);
511
512	if (snapToPixelGrid) {
513	snapToPixelGrid = false;
514	matrixDirty = true;
515	}
516
517	if (prepareForDraw(srcPixelsAreOpaque: opaque))
518	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::ImageTexture), QT_IMAGE_TEXTURE_UNIT);
519
520	if (pattern) {
521	QColor col = qt_premultiplyColor(c: q->state()->pen.color(), opacity: (GLfloat)q->state()->opacity);
522	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::PatternColor), color: col);
523	}
524
525	GLfloat dx = 1.0 / textureSize.width();
526	GLfloat dy = 1.0 / textureSize.height();
527
528	QGLRect srcTextureRect(src.left*dx, src.top*dy, src.right*dx, src.bottom*dy);
529
530	setCoords(coords: staticVertexCoordinateArray, rect: dest);
531	setCoords(coords: staticTextureCoordinateArray, rect: srcTextureRect);
532
533	glDrawArrays(GL_TRIANGLE_FAN, first: 0, count: 4);
534	}
535
536	void QGL2PaintEngineEx::beginNativePainting()
537	{
538	Q_D(QGL2PaintEngineEx);
539	ensureActive();
540	d->transferMode(newMode: BrushDrawingMode);
541
542	d->nativePaintingActive = true;
543
544	d->glUseProgram(program: 0);
545
546	// Disable all the vertex attribute arrays:
547	for (int i = 0; i < QT_GL_VERTEX_ARRAY_TRACKED_COUNT; ++i)
548	d->glDisableVertexAttribArray(index: i);
549
550	#ifndef QT_OPENGL_ES_2
551	if (!d->ctx->contextHandle()->isOpenGLES()) {
552	const QGLContext *ctx = d->ctx;
553	const QGLFormat &fmt = d->device->format();
554	if (fmt.majorVersion() < 3 || (fmt.majorVersion() == 3 && fmt.minorVersion() < 1)
555	|| (fmt.majorVersion() == 3 && fmt.minorVersion() == 1 && ctx->contextHandle()->hasExtension(QByteArrayLiteral("GL_ARB_compatibility")))
556	|| fmt.profile() == QGLFormat::CompatibilityProfile)
557	{
558	// be nice to people who mix OpenGL 1.x code with QPainter commands
559	// by setting modelview and projection matrices to mirror the GL 1
560	// paint engine
561	const QTransform& mtx = state()->matrix;
562
563	float mv_matrix[4][4] =
564	{
565	{ float(mtx.m11()), float(mtx.m12()), 0, float(mtx.m13()) },
566	{ float(mtx.m21()), float(mtx.m22()), 0, float(mtx.m23()) },
567	{ 0, 0, 1, 0 },
568	{ float(mtx.dx()), float(mtx.dy()), 0, float(mtx.m33()) }
569	};
570
571	const QSize sz = d->device->size();
572
573	QOpenGLFunctions_1_1 *gl1funcs = QOpenGLContext::currentContext()->versionFunctions<QOpenGLFunctions_1_1>();
574	gl1funcs->initializeOpenGLFunctions();
575
576	gl1funcs->glMatrixMode(GL_PROJECTION);
577	gl1funcs->glLoadIdentity();
578	gl1funcs->glOrtho(left: 0, right: sz.width(), bottom: sz.height(), top: 0, zNear: -999999, zFar: 999999);
579
580	gl1funcs->glMatrixMode(GL_MODELVIEW);
581	gl1funcs->glLoadMatrixf(m: &mv_matrix[0][0]);
582	}
583	}
584	#endif
585
586	d->lastTextureUsed = GLuint(-1);
587	d->dirtyStencilRegion = QRect(0, 0, d->width, d->height);
588	d->resetGLState();
589
590	d->shaderManager->setDirty();
591
592	d->needsSync = true;
593	}
594
595	void QGL2PaintEngineExPrivate::resetGLState()
596	{
597	glDisable(GL_BLEND);
598	glActiveTexture(GL_TEXTURE0);
599	glDisable(GL_STENCIL_TEST);
600	glDisable(GL_DEPTH_TEST);
601	glDisable(GL_SCISSOR_TEST);
602	glDepthMask(flag: true);
603	glDepthFunc(GL_LESS);
604	glClearDepthf(depth: 1);
605	glStencilMask(mask: 0xff);
606	glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
607	glStencilFunc(GL_ALWAYS, ref: 0, mask: 0xff);
608	ctx->d_func()->setVertexAttribArrayEnabled(arrayIndex: QT_TEXTURE_COORDS_ATTR, enabled: false);
609	ctx->d_func()->setVertexAttribArrayEnabled(arrayIndex: QT_VERTEX_COORDS_ATTR, enabled: false);
610	ctx->d_func()->setVertexAttribArrayEnabled(arrayIndex: QT_OPACITY_ATTR, enabled: false);
611	#ifndef QT_OPENGL_ES_2
612	if (!ctx->contextHandle()->isOpenGLES()) {
613	// gl_Color, corresponding to vertex attribute 3, may have been changed
614	float color[] = { 1.0f, 1.0f, 1.0f, 1.0f };
615	glVertexAttrib4fv(indx: 3, values: color);
616	}
617	#endif
618	}
619
620	bool QGL2PaintEngineExPrivate::resetOpenGLContextActiveEngine()
621	{
622	QOpenGLContext *guiGlContext = ctx->contextHandle();
623	QOpenGLContextPrivate *guiGlContextPrivate =
624	guiGlContext ? QOpenGLContextPrivate::get(context: guiGlContext) : 0;
625
626	if (guiGlContextPrivate && guiGlContextPrivate->active_engine) {
627	ctx->d_func()->refreshCurrentFbo();
628	guiGlContextPrivate->active_engine = 0;
629	return true;
630	}
631
632	return false;
633	}
634
635	void QGL2PaintEngineEx::endNativePainting()
636	{
637	Q_D(QGL2PaintEngineEx);
638	d->needsSync = true;
639	d->nativePaintingActive = false;
640	}
641
642	void QGL2PaintEngineEx::invalidateState()
643	{
644	Q_D(QGL2PaintEngineEx);
645	d->needsSync = true;
646	}
647
648	bool QGL2PaintEngineEx::isNativePaintingActive() const {
649	Q_D(const QGL2PaintEngineEx);
650	return d->nativePaintingActive;
651	}
652
653	bool QGL2PaintEngineEx::shouldDrawCachedGlyphs(QFontEngine *fontEngine, const QTransform &t) const
654	{
655	// The paint engine does not support projected cached glyph drawing
656	if (t.type() == QTransform::TxProject)
657	return false;
658
659	// The font engine might not support filling the glyph cache
660	// with the given transform applied, in which case we need to
661	// fall back to the QPainterPath code-path.
662	if (!fontEngine->supportsTransformation(transform: t)) {
663	// Except that drawing paths is slow, so for scales between
664	// 0.5 and 2.0 we leave the glyph cache untransformed and deal
665	// with the transform ourselves when painting, resulting in
666	// drawing 1x cached glyphs with a smooth-scale.
667	float det = t.determinant();
668	if (det >= 0.25f && det <= 4.f) {
669	// Assuming the baseclass still agrees
670	return QPaintEngineEx::shouldDrawCachedGlyphs(fontEngine, m: t);
671	}
672
673	return false; // Fall back to path-drawing
674	}
675
676	return QPaintEngineEx::shouldDrawCachedGlyphs(fontEngine, m: t);
677	}
678
679	void QGL2PaintEngineExPrivate::transferMode(EngineMode newMode)
680	{
681	if (newMode == mode)
682	return;
683
684	if (mode == TextDrawingMode || mode == ImageDrawingMode || mode == ImageArrayDrawingMode) {
685	lastTextureUsed = GLuint(-1);
686	}
687
688	if (newMode == TextDrawingMode) {
689	shaderManager->setHasComplexGeometry(true);
690	} else {
691	shaderManager->setHasComplexGeometry(false);
692	}
693
694	if (newMode == ImageDrawingMode) {
695	setVertexAttributePointer(arrayIndex: QT_VERTEX_COORDS_ATTR, pointer: staticVertexCoordinateArray);
696	setVertexAttributePointer(arrayIndex: QT_TEXTURE_COORDS_ATTR, pointer: staticTextureCoordinateArray);
697	}
698
699	if (newMode == ImageArrayDrawingMode) {
700	setVertexAttributePointer(arrayIndex: QT_VERTEX_COORDS_ATTR, pointer: (GLfloat*)vertexCoordinateArray.data());
701	setVertexAttributePointer(arrayIndex: QT_TEXTURE_COORDS_ATTR, pointer: (GLfloat*)textureCoordinateArray.data());
702	setVertexAttributePointer(arrayIndex: QT_OPACITY_ATTR, pointer: (GLfloat*)opacityArray.data());
703	}
704
705	// This needs to change when we implement high-quality anti-aliasing...
706	if (newMode != TextDrawingMode)
707	shaderManager->setMaskType(QGLEngineShaderManager::NoMask);
708
709	mode = newMode;
710	}
711
712	struct QGL2PEVectorPathCache
713	{
714	#ifdef QT_OPENGL_CACHE_AS_VBOS
715	GLuint vbo;
716	GLuint ibo;
717	#else
718	float *vertices;
719	void *indices;
720	#endif
721	int vertexCount;
722	int indexCount;
723	GLenum primitiveType;
724	qreal iscale;
725	QVertexIndexVector::Type indexType;
726	};
727
728	void QGL2PaintEngineExPrivate::cleanupVectorPath(QPaintEngineEx *engine, void *data)
729	{
730	QGL2PEVectorPathCache *c = (QGL2PEVectorPathCache *) data;
731	#ifdef QT_OPENGL_CACHE_AS_VBOS
732	Q_ASSERT(engine->type() == QPaintEngine::OpenGL2);
733	static_cast<QGL2PaintEngineEx *>(engine)->d_func()->unusedVBOSToClean << c->vbo;
734	if (c->ibo)
735	d->unusedIBOSToClean << c->ibo;
736	#else
737	Q_UNUSED(engine);
738	free(ptr: c->vertices);
739	free(ptr: c->indices);
740	#endif
741	delete c;
742	}
743
744	// Assumes everything is configured for the brush you want to use
745	void QGL2PaintEngineExPrivate::fill(const QVectorPath& path)
746	{
747	transferMode(newMode: BrushDrawingMode);
748
749	if (snapToPixelGrid) {
750	snapToPixelGrid = false;
751	matrixDirty = true;
752	}
753
754	// Might need to call updateMatrix to re-calculate inverseScale
755	if (matrixDirty)
756	updateMatrix();
757
758	const QPointF* const points = reinterpret_cast<const QPointF*>(path.points());
759
760	// Check to see if there's any hints
761	if (path.shape() == QVectorPath::RectangleHint) {
762	QGLRect rect(points[0].x(), points[0].y(), points[2].x(), points[2].y());
763	prepareForDraw(srcPixelsAreOpaque: currentBrush.isOpaque());
764	composite(boundingRect: rect);
765	} else if (path.isConvex()) {
766
767	if (path.isCacheable()) {
768	QVectorPath::CacheEntry *data = path.lookupCacheData(engine: q);
769	QGL2PEVectorPathCache *cache;
770
771	bool updateCache = false;
772
773	if (data) {
774	cache = (QGL2PEVectorPathCache *) data->data;
775	// Check if scale factor is exceeded for curved paths and generate curves if so...
776	if (path.isCurved()) {
777	qreal scaleFactor = cache->iscale / inverseScale;
778	if (scaleFactor < 0.5 || scaleFactor > 2.0) {
779	#ifdef QT_OPENGL_CACHE_AS_VBOS
780	glDeleteBuffers(1, &cache->vbo);
781	cache->vbo = 0;
782	Q_ASSERT(cache->ibo == 0);
783	#else
784	free(ptr: cache->vertices);
785	Q_ASSERT(cache->indices == 0);
786	#endif
787	updateCache = true;
788	}
789	}
790	} else {
791	cache = new QGL2PEVectorPathCache;
792	data = const_cast<QVectorPath &>(path).addCacheData(engine: q, data: cache, cleanup: cleanupVectorPath);
793	updateCache = true;
794	}
795
796	// Flatten the path at the current scale factor and fill it into the cache struct.
797	if (updateCache) {
798	vertexCoordinateArray.clear();
799	vertexCoordinateArray.addPath(path, curveInverseScale: inverseScale, outline: false);
800	int vertexCount = vertexCoordinateArray.vertexCount();
801	int floatSizeInBytes = vertexCount * 2 * sizeof(float);
802	cache->vertexCount = vertexCount;
803	cache->indexCount = 0;
804	cache->primitiveType = GL_TRIANGLE_FAN;
805	cache->iscale = inverseScale;
806	#ifdef QT_OPENGL_CACHE_AS_VBOS
807	glGenBuffers(1, &cache->vbo);
808	glBindBuffer(GL_ARRAY_BUFFER, cache->vbo);
809	glBufferData(GL_ARRAY_BUFFER, floatSizeInBytes, vertexCoordinateArray.data(), GL_STATIC_DRAW);
810	cache->ibo = 0;
811	#else
812	cache->vertices = (float *) malloc(size: floatSizeInBytes);
813	memcpy(dest: cache->vertices, src: vertexCoordinateArray.data(), n: floatSizeInBytes);
814	cache->indices = 0;
815	#endif
816	}
817
818	prepareForDraw(srcPixelsAreOpaque: currentBrush.isOpaque());
819	#ifdef QT_OPENGL_CACHE_AS_VBOS
820	glBindBuffer(GL_ARRAY_BUFFER, cache->vbo);
821	setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, 0);
822	#else
823	setVertexAttributePointer(arrayIndex: QT_VERTEX_COORDS_ATTR, pointer: cache->vertices);
824	#endif
825	glDrawArrays(mode: cache->primitiveType, first: 0, count: cache->vertexCount);
826
827	} else {
828	// printf(" - Marking path as cachable...\n");
829	// Tag it for later so that if the same path is drawn twice, it is assumed to be static and thus cachable
830	path.makeCacheable();
831	vertexCoordinateArray.clear();
832	vertexCoordinateArray.addPath(path, curveInverseScale: inverseScale, outline: false);
833	prepareForDraw(srcPixelsAreOpaque: currentBrush.isOpaque());
834	drawVertexArrays(vertexArray&: vertexCoordinateArray, GL_TRIANGLE_FAN);
835	}
836
837	} else {
838	bool useCache = path.isCacheable();
839	if (useCache) {
840	QRectF bbox = path.controlPointRect();
841	// If the path doesn't fit within these limits, it is possible that the triangulation will fail.
842	useCache &= (bbox.left() > -0x8000 * inverseScale)
843	&& (bbox.right() < 0x8000 * inverseScale)
844	&& (bbox.top() > -0x8000 * inverseScale)
845	&& (bbox.bottom() < 0x8000 * inverseScale);
846	}
847
848	if (useCache) {
849	QVectorPath::CacheEntry *data = path.lookupCacheData(engine: q);
850	QGL2PEVectorPathCache *cache;
851
852	bool updateCache = false;
853
854	if (data) {
855	cache = (QGL2PEVectorPathCache *) data->data;
856	// Check if scale factor is exceeded for curved paths and generate curves if so...
857	if (path.isCurved()) {
858	qreal scaleFactor = cache->iscale / inverseScale;
859	if (scaleFactor < 0.5 || scaleFactor > 2.0) {
860	#ifdef QT_OPENGL_CACHE_AS_VBOS
861	glDeleteBuffers(1, &cache->vbo);
862	glDeleteBuffers(1, &cache->ibo);
863	#else
864	free(ptr: cache->vertices);
865	free(ptr: cache->indices);
866	#endif
867	updateCache = true;
868	}
869	}
870	} else {
871	cache = new QGL2PEVectorPathCache;
872	data = const_cast<QVectorPath &>(path).addCacheData(engine: q, data: cache, cleanup: cleanupVectorPath);
873	updateCache = true;
874	}
875
876	// Flatten the path at the current scale factor and fill it into the cache struct.
877	if (updateCache) {
878	QTriangleSet polys = qTriangulate(path, matrix: QTransform().scale(sx: 1 / inverseScale, sy: 1 / inverseScale));
879	cache->vertexCount = polys.vertices.size() / 2;
880	cache->indexCount = polys.indices.size();
881	cache->primitiveType = GL_TRIANGLES;
882	cache->iscale = inverseScale;
883	cache->indexType = polys.indices.type();
884	#ifdef QT_OPENGL_CACHE_AS_VBOS
885	glGenBuffers(1, &cache->vbo);
886	glGenBuffers(1, &cache->ibo);
887	glBindBuffer(GL_ARRAY_BUFFER, cache->vbo);
888	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cache->ibo);
889
890	if (polys.indices.type() == QVertexIndexVector::UnsignedInt)
891	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(quint32) * polys.indices.size(), polys.indices.data(), GL_STATIC_DRAW);
892	else
893	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(quint16) * polys.indices.size(), polys.indices.data(), GL_STATIC_DRAW);
894
895	QVarLengthArray<float> vertices(polys.vertices.size());
896	for (int i = 0; i < polys.vertices.size(); ++i)
897	vertices[i] = float(inverseScale * polys.vertices.at(i));
898	glBufferData(GL_ARRAY_BUFFER, sizeof(float) * vertices.size(), vertices.data(), GL_STATIC_DRAW);
899	#else
900	cache->vertices = (float *) malloc(size: sizeof(float) * polys.vertices.size());
901	if (polys.indices.type() == QVertexIndexVector::UnsignedInt) {
902	cache->indices = (quint32 *) malloc(size: sizeof(quint32) * polys.indices.size());
903	memcpy(dest: cache->indices, src: polys.indices.data(), n: sizeof(quint32) * polys.indices.size());
904	} else {
905	cache->indices = (quint16 *) malloc(size: sizeof(quint16) * polys.indices.size());
906	memcpy(dest: cache->indices, src: polys.indices.data(), n: sizeof(quint16) * polys.indices.size());
907	}
908	for (int i = 0; i < polys.vertices.size(); ++i)
909	cache->vertices[i] = float(inverseScale * polys.vertices.at(i));
910	#endif
911	}
912
913	prepareForDraw(srcPixelsAreOpaque: currentBrush.isOpaque());
914	#ifdef QT_OPENGL_CACHE_AS_VBOS
915	glBindBuffer(GL_ARRAY_BUFFER, cache->vbo);
916	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cache->ibo);
917	setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, 0);
918	if (cache->indexType == QVertexIndexVector::UnsignedInt)
919	glDrawElements(cache->primitiveType, cache->indexCount, GL_UNSIGNED_INT, 0);
920	else
921	glDrawElements(cache->primitiveType, cache->indexCount, GL_UNSIGNED_SHORT, 0);
922	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
923	glBindBuffer(GL_ARRAY_BUFFER, 0);
924	#else
925	setVertexAttributePointer(arrayIndex: QT_VERTEX_COORDS_ATTR, pointer: cache->vertices);
926	if (cache->indexType == QVertexIndexVector::UnsignedInt)
927	glDrawElements(mode: cache->primitiveType, count: cache->indexCount, GL_UNSIGNED_INT, indices: (qint32 *)cache->indices);
928	else
929	glDrawElements(mode: cache->primitiveType, count: cache->indexCount, GL_UNSIGNED_SHORT, indices: (qint16 *)cache->indices);
930	#endif
931
932	} else {
933	// printf(" - Marking path as cachable...\n");
934	// Tag it for later so that if the same path is drawn twice, it is assumed to be static and thus cachable
935	path.makeCacheable();
936
937	if (!device->format().stencil()) {
938	// If there is no stencil buffer, triangulate the path instead.
939
940	QRectF bbox = path.controlPointRect();
941	// If the path doesn't fit within these limits, it is possible that the triangulation will fail.
942	bool withinLimits = (bbox.left() > -0x8000 * inverseScale)
943	&& (bbox.right() < 0x8000 * inverseScale)
944	&& (bbox.top() > -0x8000 * inverseScale)
945	&& (bbox.bottom() < 0x8000 * inverseScale);
946	if (withinLimits) {
947	QTriangleSet polys = qTriangulate(path, matrix: QTransform().scale(sx: 1 / inverseScale, sy: 1 / inverseScale));
948
949	QVarLengthArray<float> vertices(polys.vertices.size());
950	for (int i = 0; i < polys.vertices.size(); ++i)
951	vertices[i] = float(inverseScale * polys.vertices.at(i));
952
953	prepareForDraw(srcPixelsAreOpaque: currentBrush.isOpaque());
954	setVertexAttributePointer(arrayIndex: QT_VERTEX_COORDS_ATTR, pointer: vertices.constData());
955	if (polys.indices.type() == QVertexIndexVector::UnsignedInt)
956	glDrawElements(GL_TRIANGLES, count: polys.indices.size(), GL_UNSIGNED_INT, indices: polys.indices.data());
957	else
958	glDrawElements(GL_TRIANGLES, count: polys.indices.size(), GL_UNSIGNED_SHORT, indices: polys.indices.data());
959	} else {
960	// We can't handle big, concave painter paths with OpenGL without stencil buffer.
961	qWarning(msg: "Painter path exceeds +/-32767 pixels.");
962	}
963	return;
964	}
965
966	// The path is too complicated & needs the stencil technique
967	vertexCoordinateArray.clear();
968	vertexCoordinateArray.addPath(path, curveInverseScale: inverseScale, outline: false);
969
970	fillStencilWithVertexArray(vertexArray&: vertexCoordinateArray, useWindingFill: path.hasWindingFill());
971
972	glStencilMask(mask: 0xff);
973	glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE);
974
975	if (q->state()->clipTestEnabled) {
976	// Pass when high bit is set, replace stencil value with current clip
977	glStencilFunc(GL_NOTEQUAL, ref: q->state()->currentClip, GL_STENCIL_HIGH_BIT);
978	} else if (path.hasWindingFill()) {
979	// Pass when any bit is set, replace stencil value with 0
980	glStencilFunc(GL_NOTEQUAL, ref: 0, mask: 0xff);
981	} else {
982	// Pass when high bit is set, replace stencil value with 0
983	glStencilFunc(GL_NOTEQUAL, ref: 0, GL_STENCIL_HIGH_BIT);
984	}
985	prepareForDraw(srcPixelsAreOpaque: currentBrush.isOpaque());
986
987	// Stencil the brush onto the dest buffer
988	composite(boundingRect: vertexCoordinateArray.boundingRect());
989	glStencilMask(mask: 0);
990	updateClipScissorTest();
991	}
992	}
993	}
994
995
996	void QGL2PaintEngineExPrivate::fillStencilWithVertexArray(const float *data,
997	int count,
998	int *stops,
999	int stopCount,
1000	const QGLRect &bounds,
1001	StencilFillMode mode)
1002	{
1003	Q_ASSERT(count || stops);
1004
1005	// qDebug("QGL2PaintEngineExPrivate::fillStencilWithVertexArray()");
1006	glStencilMask(mask: 0xff); // Enable stencil writes
1007
1008	if (dirtyStencilRegion.intersects(r: currentScissorBounds)) {
1009	const QRegion clearRegion = dirtyStencilRegion.intersected(r: currentScissorBounds);
1010	glClearStencil(s: 0); // Clear to zero
1011	for (const QRect &rect : clearRegion) {
1012	#ifndef QT_GL_NO_SCISSOR_TEST
1013	setScissor(rect);
1014	#endif
1015	glClear(GL_STENCIL_BUFFER_BIT);
1016	}
1017
1018	dirtyStencilRegion -= currentScissorBounds;
1019
1020	#ifndef QT_GL_NO_SCISSOR_TEST
1021	updateClipScissorTest();
1022	#endif
1023	}
1024
1025	glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); // Disable color writes
1026	useSimpleShader();
1027	glEnable(GL_STENCIL_TEST); // For some reason, this has to happen _after_ the simple shader is use()'d
1028
1029	if (mode == WindingFillMode) {
1030	Q_ASSERT(stops && !count);
1031	if (q->state()->clipTestEnabled) {
1032	// Flatten clip values higher than current clip, and set high bit to match current clip
1033	glStencilFunc(GL_LEQUAL, GL_STENCIL_HIGH_BIT | q->state()->currentClip, mask: ~GL_STENCIL_HIGH_BIT);
1034	glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE);
1035	composite(boundingRect: bounds);
1036
1037	glStencilFunc(GL_EQUAL, GL_STENCIL_HIGH_BIT, GL_STENCIL_HIGH_BIT);
1038	} else if (!stencilClean) {
1039	// Clear stencil buffer within bounding rect
1040	glStencilFunc(GL_ALWAYS, ref: 0, mask: 0xff);
1041	glStencilOp(GL_ZERO, GL_ZERO, GL_ZERO);
1042	composite(boundingRect: bounds);
1043	}
1044
1045	// Inc. for front-facing triangle
1046	glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_INCR_WRAP, GL_INCR_WRAP);
1047	// Dec. for back-facing "holes"
1048	glStencilOpSeparate(GL_BACK, GL_KEEP, GL_DECR_WRAP, GL_DECR_WRAP);
1049	glStencilMask(mask: ~GL_STENCIL_HIGH_BIT);
1050	drawVertexArrays(data, stops, stopCount, GL_TRIANGLE_FAN);
1051
1052	if (q->state()->clipTestEnabled) {
1053	// Clear high bit of stencil outside of path
1054	glStencilFunc(GL_EQUAL, ref: q->state()->currentClip, mask: ~GL_STENCIL_HIGH_BIT);
1055	glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE);
1056	glStencilMask(GL_STENCIL_HIGH_BIT);
1057	composite(boundingRect: bounds);
1058	}
1059	} else if (mode == OddEvenFillMode) {
1060	glStencilMask(GL_STENCIL_HIGH_BIT);
1061	glStencilOp(GL_KEEP, GL_KEEP, GL_INVERT); // Simply invert the stencil bit
1062	drawVertexArrays(data, stops, stopCount, GL_TRIANGLE_FAN);
1063
1064	} else { // TriStripStrokeFillMode
1065	Q_ASSERT(count && !stops); // tristrips generated directly, so no vertexArray or stops
1066	glStencilMask(GL_STENCIL_HIGH_BIT);
1067	#if 0
1068	glStencilOp(GL_KEEP, GL_KEEP, GL_INVERT); // Simply invert the stencil bit
1069	setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, data);
1070	glDrawArrays(GL_TRIANGLE_STRIP, 0, count);
1071	#else
1072
1073	glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
1074	if (q->state()->clipTestEnabled) {
1075	glStencilFunc(GL_LEQUAL, ref: q->state()->currentClip | GL_STENCIL_HIGH_BIT,
1076	mask: ~GL_STENCIL_HIGH_BIT);
1077	} else {
1078	glStencilFunc(GL_ALWAYS, GL_STENCIL_HIGH_BIT, mask: 0xff);
1079	}
1080	setVertexAttributePointer(arrayIndex: QT_VERTEX_COORDS_ATTR, pointer: data);
1081	glDrawArrays(GL_TRIANGLE_STRIP, first: 0, count);
1082	#endif
1083	}
1084
1085	// Enable color writes & disable stencil writes
1086	glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
1087	}
1088
1089	/*
1090	If the maximum value in the stencil buffer is GL_STENCIL_HIGH_BIT - 1,
1091	restore the stencil buffer to a pristine state. The current clip region
1092	is set to 1, and the rest to 0.
1093	*/
1094	void QGL2PaintEngineExPrivate::resetClipIfNeeded()
1095	{
1096	if (maxClip != (GL_STENCIL_HIGH_BIT - 1))
1097	return;
1098
1099	Q_Q(QGL2PaintEngineEx);
1100
1101	useSimpleShader();
1102	glEnable(GL_STENCIL_TEST);
1103	glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
1104
1105	QRectF bounds = q->state()->matrix.inverted().mapRect(QRectF(0, 0, width, height));
1106	QGLRect rect(bounds.left(), bounds.top(), bounds.right(), bounds.bottom());
1107
1108	// Set high bit on clip region
1109	glStencilFunc(GL_LEQUAL, ref: q->state()->currentClip, mask: 0xff);
1110	glStencilOp(GL_KEEP, GL_INVERT, GL_INVERT);
1111	glStencilMask(GL_STENCIL_HIGH_BIT);
1112	composite(boundingRect: rect);
1113
1114	// Reset clipping to 1 and everything else to zero
1115	glStencilFunc(GL_NOTEQUAL, ref: 0x01, GL_STENCIL_HIGH_BIT);
1116	glStencilOp(GL_ZERO, GL_REPLACE, GL_REPLACE);
1117	glStencilMask(mask: 0xff);
1118	composite(boundingRect: rect);
1119
1120	q->state()->currentClip = 1;
1121	q->state()->canRestoreClip = false;
1122
1123	maxClip = 1;
1124
1125	glStencilMask(mask: 0x0);
1126	glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
1127	}
1128
1129	bool QGL2PaintEngineExPrivate::prepareForCachedGlyphDraw(const QFontEngineGlyphCache &cache)
1130	{
1131	Q_Q(QGL2PaintEngineEx);
1132
1133	Q_ASSERT(cache.transform().type() <= QTransform::TxScale);
1134
1135	QTransform &transform = q->state()->matrix;
1136	transform.scale(sx: 1.0 / cache.transform().m11(), sy: 1.0 / cache.transform().m22());
1137	bool ret = prepareForDraw(srcPixelsAreOpaque: false);
1138	transform.scale(sx: cache.transform().m11(), sy: cache.transform().m22());
1139
1140	return ret;
1141	}
1142
1143	bool QGL2PaintEngineExPrivate::prepareForDraw(bool srcPixelsAreOpaque)
1144	{
1145	if (brushTextureDirty && mode != ImageDrawingMode && mode != ImageArrayDrawingMode)
1146	updateBrushTexture();
1147
1148	if (compositionModeDirty)
1149	updateCompositionMode();
1150
1151	if (matrixDirty)
1152	updateMatrix();
1153
1154	const bool stateHasOpacity = q->state()->opacity < 0.99f;
1155	if (q->state()->composition_mode == QPainter::CompositionMode_Source
1156	|| (q->state()->composition_mode == QPainter::CompositionMode_SourceOver
1157	&& srcPixelsAreOpaque && !stateHasOpacity))
1158	{
1159	glDisable(GL_BLEND);
1160	} else {
1161	glEnable(GL_BLEND);
1162	}
1163
1164	QGLEngineShaderManager::OpacityMode opacityMode;
1165	if (mode == ImageArrayDrawingMode) {
1166	opacityMode = QGLEngineShaderManager::AttributeOpacity;
1167	} else {
1168	opacityMode = stateHasOpacity ? QGLEngineShaderManager::UniformOpacity
1169	: QGLEngineShaderManager::NoOpacity;
1170	if (stateHasOpacity && (mode != ImageDrawingMode)) {
1171	// Using a brush
1172	bool brushIsPattern = (currentBrush.style() >= Qt::Dense1Pattern) &&
1173	(currentBrush.style() <= Qt::DiagCrossPattern);
1174
1175	if ((currentBrush.style() == Qt::SolidPattern) || brushIsPattern)
1176	opacityMode = QGLEngineShaderManager::NoOpacity; // Global opacity handled by srcPixel shader
1177	}
1178	}
1179	shaderManager->setOpacityMode(opacityMode);
1180
1181	bool changed = shaderManager->useCorrectShaderProg();
1182	// If the shader program needs changing, we change it and mark all uniforms as dirty
1183	if (changed) {
1184	// The shader program has changed so mark all uniforms as dirty:
1185	brushUniformsDirty = true;
1186	opacityUniformDirty = true;
1187	matrixUniformDirty = true;
1188	translateZUniformDirty = true;
1189	}
1190
1191	if (brushUniformsDirty && mode != ImageDrawingMode && mode != ImageArrayDrawingMode)
1192	updateBrushUniforms();
1193
1194	if (opacityMode == QGLEngineShaderManager::UniformOpacity && opacityUniformDirty) {
1195	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::GlobalOpacity), value: (GLfloat)q->state()->opacity);
1196	opacityUniformDirty = false;
1197	}
1198
1199	if (matrixUniformDirty && shaderManager->hasComplexGeometry()) {
1200	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::Matrix),
1201	value: pmvMatrix);
1202	matrixUniformDirty = false;
1203	}
1204
1205	if (translateZUniformDirty && shaderManager->hasComplexGeometry()) {
1206	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::TranslateZ),
1207	value: translateZ);
1208	translateZUniformDirty = false;
1209	}
1210
1211	return changed;
1212	}
1213
1214	void QGL2PaintEngineExPrivate::composite(const QGLRect& boundingRect)
1215	{
1216	setCoords(coords: staticVertexCoordinateArray, rect: boundingRect);
1217	setVertexAttributePointer(arrayIndex: QT_VERTEX_COORDS_ATTR, pointer: staticVertexCoordinateArray);
1218	glDrawArrays(GL_TRIANGLE_FAN, first: 0, count: 4);
1219	}
1220
1221	// Draws the vertex array as a set of <vertexArrayStops.size()> triangle fans.
1222	void QGL2PaintEngineExPrivate::drawVertexArrays(const float *data, int *stops, int stopCount,
1223	GLenum primitive)
1224	{
1225	// Now setup the pointer to the vertex array:
1226	setVertexAttributePointer(arrayIndex: QT_VERTEX_COORDS_ATTR, pointer: data);
1227
1228	int previousStop = 0;
1229	for (int i=0; i<stopCount; ++i) {
1230	int stop = stops[i];
1231	/*
1232	qDebug("Drawing triangle fan for vertecies %d -> %d:", previousStop, stop-1);
1233	for (int i=previousStop; i<stop; ++i)
1234	qDebug(" %02d: [%.2f, %.2f]", i, vertexArray.data()[i].x, vertexArray.data()[i].y);
1235	*/
1236	glDrawArrays(mode: primitive, first: previousStop, count: stop - previousStop);
1237	previousStop = stop;
1238	}
1239	}
1240
1241	/////////////////////////////////// Public Methods //////////////////////////////////////////
1242
1243	QGL2PaintEngineEx::QGL2PaintEngineEx()
1244	: QPaintEngineEx(*(new QGL2PaintEngineExPrivate(this)))
1245	{
1246	}
1247
1248	QGL2PaintEngineEx::~QGL2PaintEngineEx()
1249	{
1250	}
1251
1252	void QGL2PaintEngineEx::fill(const QVectorPath &path, const QBrush &brush)
1253	{
1254	Q_D(QGL2PaintEngineEx);
1255
1256	if (qbrush_style(b: brush) == Qt::NoBrush)
1257	return;
1258	ensureActive();
1259	d->setBrush(brush);
1260	d->fill(path);
1261	}
1262
1263	Q_GUI_EXPORT bool qt_scaleForTransform(const QTransform &transform, qreal *scale); // qtransform.cpp
1264
1265
1266	void QGL2PaintEngineEx::stroke(const QVectorPath &path, const QPen &pen)
1267	{
1268	Q_D(QGL2PaintEngineEx);
1269
1270	const QBrush &penBrush = qpen_brush(p: pen);
1271	if (qpen_style(p: pen) == Qt::NoPen || qbrush_style(b: penBrush) == Qt::NoBrush)
1272	return;
1273
1274	QGL2PaintEngineState *s = state();
1275	if (qt_pen_is_cosmetic(pen, hints: s->renderHints) && !qt_scaleForTransform(transform: s->transform(), scale: 0)) {
1276	// QTriangulatingStroker class is not meant to support cosmetically sheared strokes.
1277	QPaintEngineEx::stroke(path, pen);
1278	return;
1279	}
1280
1281	ensureActive();
1282	d->setBrush(penBrush);
1283	d->stroke(path, pen);
1284	}
1285
1286	void QGL2PaintEngineExPrivate::stroke(const QVectorPath &path, const QPen &pen)
1287	{
1288	const QGL2PaintEngineState *s = q->state();
1289	if (snapToPixelGrid) {
1290	snapToPixelGrid = false;
1291	matrixDirty = true;
1292	}
1293
1294	const Qt::PenStyle penStyle = qpen_style(p: pen);
1295	const QBrush &penBrush = qpen_brush(p: pen);
1296	const bool opaque = penBrush.isOpaque() && s->opacity > 0.99;
1297
1298	transferMode(newMode: BrushDrawingMode);
1299
1300	// updateMatrix() is responsible for setting the inverse scale on
1301	// the strokers, so we need to call it here and not wait for
1302	// prepareForDraw() down below.
1303	updateMatrix();
1304
1305	QRectF clip = q->state()->matrix.inverted().mapRect(q->state()->clipEnabled
1306	? q->state()->rectangleClip
1307	: QRectF(0, 0, width, height));
1308
1309	if (penStyle == Qt::SolidLine) {
1310	stroker.process(path, pen, clip, hints: s->renderHints);
1311
1312	} else { // Some sort of dash
1313	dasher.process(path, pen, clip, hints: s->renderHints);
1314
1315	QVectorPath dashStroke(dasher.points(),
1316	dasher.elementCount(),
1317	dasher.elementTypes());
1318	stroker.process(path: dashStroke, pen, clip, hints: s->renderHints);
1319	}
1320
1321	if (!stroker.vertexCount())
1322	return;
1323
1324	if (opaque) {
1325	prepareForDraw(srcPixelsAreOpaque: opaque);
1326	setVertexAttributePointer(arrayIndex: QT_VERTEX_COORDS_ATTR, pointer: stroker.vertices());
1327	glDrawArrays(GL_TRIANGLE_STRIP, first: 0, count: stroker.vertexCount() / 2);
1328
1329	// QBrush b(Qt::green);
1330	// d->setBrush(&b);
1331	// d->prepareForDraw(true);
1332	// glDrawArrays(GL_LINE_STRIP, 0, d->stroker.vertexCount() / 2);
1333
1334	} else {
1335	qreal width = qpen_widthf(p: pen) / 2;
1336	if (width == 0)
1337	width = 0.5;
1338	qreal extra = pen.joinStyle() == Qt::MiterJoin
1339	? qMax(a: pen.miterLimit() * width, b: width)
1340	: width;
1341
1342	if (qt_pen_is_cosmetic(pen, hints: s->renderHints))
1343	extra = extra * inverseScale;
1344
1345	QRectF bounds = path.controlPointRect().adjusted(xp1: -extra, yp1: -extra, xp2: extra, yp2: extra);
1346
1347	fillStencilWithVertexArray(data: stroker.vertices(), count: stroker.vertexCount() / 2,
1348	stops: 0, stopCount: 0, bounds, mode: QGL2PaintEngineExPrivate::TriStripStrokeFillMode);
1349
1350	glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE);
1351
1352	// Pass when any bit is set, replace stencil value with 0
1353	glStencilFunc(GL_NOTEQUAL, ref: 0, GL_STENCIL_HIGH_BIT);
1354	prepareForDraw(srcPixelsAreOpaque: false);
1355
1356	// Stencil the brush onto the dest buffer
1357	composite(boundingRect: bounds);
1358
1359	glStencilMask(mask: 0);
1360
1361	updateClipScissorTest();
1362	}
1363	}
1364
1365	void QGL2PaintEngineEx::penChanged() { }
1366	void QGL2PaintEngineEx::brushChanged() { }
1367	void QGL2PaintEngineEx::brushOriginChanged() { }
1368
1369	void QGL2PaintEngineEx::opacityChanged()
1370	{
1371	// qDebug("QGL2PaintEngineEx::opacityChanged()");
1372	Q_D(QGL2PaintEngineEx);
1373	state()->opacityChanged = true;
1374
1375	Q_ASSERT(d->shaderManager);
1376	d->brushUniformsDirty = true;
1377	d->opacityUniformDirty = true;
1378	}
1379
1380	void QGL2PaintEngineEx::compositionModeChanged()
1381	{
1382	// qDebug("QGL2PaintEngineEx::compositionModeChanged()");
1383	Q_D(QGL2PaintEngineEx);
1384	state()->compositionModeChanged = true;
1385	d->compositionModeDirty = true;
1386	}
1387
1388	void QGL2PaintEngineEx::renderHintsChanged()
1389	{
1390	Q_D(QGL2PaintEngineEx);
1391	state()->renderHintsChanged = true;
1392
1393	#if !defined(QT_OPENGL_ES_2)
1394	QT_WARNING_PUSH
1395	QT_WARNING_DISABLE_DEPRECATED
1396	if (!d->ctx->contextHandle()->isOpenGLES()) {
1397	if ((state()->renderHints & QPainter::Antialiasing)
1398	#if QT_DEPRECATED_SINCE(5, 14)
1399	|| (state()->renderHints & QPainter::HighQualityAntialiasing)
1400	#endif
1401	)
1402	d->glEnable(GL_MULTISAMPLE);
1403	else
1404	d->glDisable(GL_MULTISAMPLE);
1405	}
1406	QT_WARNING_POP
1407	#endif
1408
1409	d->lastTextureUsed = GLuint(-1);
1410	d->brushTextureDirty = true;
1411	// qDebug("QGL2PaintEngineEx::renderHintsChanged() not implemented!");
1412	}
1413
1414	void QGL2PaintEngineEx::transformChanged()
1415	{
1416	Q_D(QGL2PaintEngineEx);
1417	d->matrixDirty = true;
1418	state()->matrixChanged = true;
1419	}
1420
1421
1422	static const QRectF scaleRect(const QRectF &r, qreal sx, qreal sy)
1423	{
1424	return QRectF(r.x() * sx, r.y() * sy, r.width() * sx, r.height() * sy);
1425	}
1426
1427	void QGL2PaintEngineEx::drawPixmap(const QRectF& dest, const QPixmap & pixmap, const QRectF & src)
1428	{
1429	Q_D(QGL2PaintEngineEx);
1430	QGLContext *ctx = d->ctx;
1431
1432	int max_texture_size = ctx->d_func()->maxTextureSize();
1433	if (pixmap.width() > max_texture_size || pixmap.height() > max_texture_size) {
1434	QPixmap scaled = pixmap.scaled(w: max_texture_size, h: max_texture_size, aspectMode: Qt::KeepAspectRatio);
1435
1436	const qreal sx = scaled.width() / qreal(pixmap.width());
1437	const qreal sy = scaled.height() / qreal(pixmap.height());
1438
1439	drawPixmap(dest, pixmap: scaled, src: scaleRect(r: src, sx, sy));
1440	return;
1441	}
1442
1443	ensureActive();
1444	d->transferMode(newMode: ImageDrawingMode);
1445
1446	QGLContext::BindOptions bindOptions = QGLContext::InternalBindOption|QGLContext::CanFlipNativePixmapBindOption;
1447	#ifdef QGL_USE_TEXTURE_POOL
1448	bindOptions |= QGLContext::TemporarilyCachedBindOption;
1449	#endif
1450
1451	d->glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
1452	QGLTexture *texture =
1453	ctx->d_func()->bindTexture(pixmap, GL_TEXTURE_2D, GL_RGBA, options: bindOptions);
1454
1455	GLfloat top = texture->options & QGLContext::InvertedYBindOption ? (pixmap.height() - src.top()) : src.top();
1456	GLfloat bottom = texture->options & QGLContext::InvertedYBindOption ? (pixmap.height() - src.bottom()) : src.bottom();
1457	QGLRect srcRect(src.left(), top, src.right(), bottom);
1458
1459	bool isBitmap = pixmap.isQBitmap();
1460	bool isOpaque = !isBitmap && !pixmap.hasAlpha();
1461
1462	d->updateTextureFilter(GL_TEXTURE_2D, GL_CLAMP_TO_EDGE,
1463	smoothPixmapTransform: state()->renderHints & QPainter::SmoothPixmapTransform, id: texture->id);
1464	d->drawTexture(dest, src: srcRect, textureSize: pixmap.size(), opaque: isOpaque, pattern: isBitmap);
1465
1466	if (texture->options&QGLContext::TemporarilyCachedBindOption) {
1467	// pixmap was temporarily cached as a QImage texture by pooling system
1468	// and should be destroyed immediately
1469	QGLTextureCache::instance()->remove(ctx, textureId: texture->id);
1470	}
1471	}
1472
1473	void QGL2PaintEngineEx::drawImage(const QRectF& dest, const QImage& image, const QRectF& src,
1474	Qt::ImageConversionFlags)
1475	{
1476	Q_D(QGL2PaintEngineEx);
1477	QGLContext *ctx = d->ctx;
1478
1479	int max_texture_size = ctx->d_func()->maxTextureSize();
1480	if (image.width() > max_texture_size || image.height() > max_texture_size) {
1481	QImage scaled = image.scaled(w: max_texture_size, h: max_texture_size, aspectMode: Qt::KeepAspectRatio);
1482
1483	const qreal sx = scaled.width() / qreal(image.width());
1484	const qreal sy = scaled.height() / qreal(image.height());
1485
1486	drawImage(dest, image: scaled, src: scaleRect(r: src, sx, sy));
1487	return;
1488	}
1489
1490	ensureActive();
1491	d->transferMode(newMode: ImageDrawingMode);
1492
1493	d->glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
1494
1495	QGLContext::BindOptions bindOptions = QGLContext::InternalBindOption;
1496	#ifdef QGL_USE_TEXTURE_POOL
1497	bindOptions |= QGLContext::TemporarilyCachedBindOption;
1498	#endif
1499
1500	QGLTexture *texture = ctx->d_func()->bindTexture(image, GL_TEXTURE_2D, GL_RGBA, options: bindOptions);
1501	GLuint id = texture->id;
1502
1503	d->updateTextureFilter(GL_TEXTURE_2D, GL_CLAMP_TO_EDGE,
1504	smoothPixmapTransform: state()->renderHints & QPainter::SmoothPixmapTransform, id);
1505	d->drawTexture(dest, src, textureSize: image.size(), opaque: !image.hasAlphaChannel());
1506
1507	if (texture->options&QGLContext::TemporarilyCachedBindOption) {
1508	// image was temporarily cached by texture pooling system
1509	// and should be destroyed immediately
1510	QGLTextureCache::instance()->remove(ctx, textureId: texture->id);
1511	}
1512	}
1513
1514	void QGL2PaintEngineEx::drawStaticTextItem(QStaticTextItem *textItem)
1515	{
1516	Q_D(QGL2PaintEngineEx);
1517
1518	ensureActive();
1519
1520	QPainterState *s = state();
1521
1522	// don't try to cache huge fonts or vastly transformed fonts
1523	QFontEngine *fontEngine = textItem->fontEngine();
1524	if (shouldDrawCachedGlyphs(fontEngine, t: s->matrix)) {
1525
1526	QFontEngine::GlyphFormat glyphFormat = fontEngine->glyphFormat != QFontEngine::Format_None
1527	? fontEngine->glyphFormat : d->glyphCacheFormat;
1528
1529	if (glyphFormat == QFontEngine::Format_A32) {
1530	if (!QGLFramebufferObject::hasOpenGLFramebufferObjects()
1531	|| d->device->alphaRequested() || s->matrix.type() > QTransform::TxTranslate
1532	|| (s->composition_mode != QPainter::CompositionMode_Source
1533	&& s->composition_mode != QPainter::CompositionMode_SourceOver))
1534	{
1535	glyphFormat = QFontEngine::Format_A8;
1536	}
1537	}
1538
1539	d->drawCachedGlyphs(glyphFormat, staticTextItem: textItem);
1540	} else {
1541	QPaintEngineEx::drawStaticTextItem(textItem);
1542	}
1543	}
1544
1545	bool QGL2PaintEngineEx::drawTexture(const QRectF &dest, GLuint textureId, const QSize &size, const QRectF &src)
1546	{
1547	Q_D(QGL2PaintEngineEx);
1548	if (!d->shaderManager)
1549	return false;
1550
1551	ensureActive();
1552	d->transferMode(newMode: ImageDrawingMode);
1553
1554	d->glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
1555	d->glBindTexture(GL_TEXTURE_2D, texture: textureId);
1556
1557	QGLRect srcRect(src.left(), src.bottom(), src.right(), src.top());
1558
1559	d->updateTextureFilter(GL_TEXTURE_2D, GL_CLAMP_TO_EDGE,
1560	smoothPixmapTransform: state()->renderHints & QPainter::SmoothPixmapTransform, id: textureId);
1561	d->drawTexture(dest, src: srcRect, textureSize: size, opaque: false);
1562	return true;
1563	}
1564
1565	void QGL2PaintEngineEx::drawTextItem(const QPointF &p, const QTextItem &textItem)
1566	{
1567	Q_D(QGL2PaintEngineEx);
1568
1569	ensureActive();
1570	QGL2PaintEngineState *s = state();
1571
1572	const QTextItemInt &ti = static_cast<const QTextItemInt &>(textItem);
1573
1574	QTransform::TransformationType txtype = s->matrix.type();
1575
1576	QFontEngine::GlyphFormat glyphFormat = ti.fontEngine->glyphFormat != QFontEngine::Format_None
1577	? ti.fontEngine->glyphFormat : d->glyphCacheFormat;
1578
1579	if (glyphFormat == QFontEngine::Format_A32) {
1580	if (!QGLFramebufferObject::hasOpenGLFramebufferObjects()
1581	|| d->device->alphaRequested() || txtype > QTransform::TxTranslate
1582	|| (state()->composition_mode != QPainter::CompositionMode_Source
1583	&& state()->composition_mode != QPainter::CompositionMode_SourceOver))
1584	{
1585	glyphFormat = QFontEngine::Format_A8;
1586	}
1587	}
1588
1589	if (shouldDrawCachedGlyphs(fontEngine: ti.fontEngine, t: s->matrix)) {
1590	QVarLengthArray<QFixedPoint> positions;
1591	QVarLengthArray<glyph_t> glyphs;
1592	QTransform matrix = QTransform::fromTranslate(dx: p.x(), dy: p.y());
1593	ti.fontEngine->getGlyphPositions(glyphs: ti.glyphs, matrix, flags: ti.flags, glyphs_out&: glyphs, positions);
1594
1595	{
1596	QStaticTextItem staticTextItem;
1597	staticTextItem.setFontEngine(ti.fontEngine);
1598	staticTextItem.glyphs = glyphs.data();
1599	staticTextItem.numGlyphs = glyphs.size();
1600	staticTextItem.glyphPositions = positions.data();
1601
1602	d->drawCachedGlyphs(glyphFormat, staticTextItem: &staticTextItem);
1603	}
1604	return;
1605	}
1606
1607	QPaintEngineEx::drawTextItem(p, textItem: ti);
1608	}
1609
1610	namespace {
1611
1612	class QOpenGLStaticTextUserData: public QStaticTextUserData
1613	{
1614	public:
1615	QOpenGLStaticTextUserData()
1616	: QStaticTextUserData(OpenGLUserData), cacheSize(0, 0), cacheSerialNumber(0)
1617	{
1618	}
1619
1620	~QOpenGLStaticTextUserData()
1621	{
1622	}
1623
1624	QSize cacheSize;
1625	QGL2PEXVertexArray vertexCoordinateArray;
1626	QGL2PEXVertexArray textureCoordinateArray;
1627	QFontEngine::GlyphFormat glyphFormat;
1628	int cacheSerialNumber;
1629	};
1630
1631	}
1632
1633
1634	// #define QT_OPENGL_DRAWCACHEDGLYPHS_INDEX_ARRAY_VBO
1635
1636	void QGL2PaintEngineExPrivate::drawCachedGlyphs(QFontEngine::GlyphFormat glyphFormat,
1637	QStaticTextItem *staticTextItem)
1638	{
1639	Q_Q(QGL2PaintEngineEx);
1640
1641	QGL2PaintEngineState *s = q->state();
1642
1643	void *cacheKey = const_cast<QGLContext *>(QGLContextPrivate::contextGroup(ctx)->context());
1644	bool recreateVertexArrays = false;
1645
1646	QTransform glyphCacheTransform;
1647	QFontEngine *fe = staticTextItem->fontEngine();
1648	if (fe->supportsTransformation(transform: s->matrix)) {
1649	// The font-engine supports rendering glyphs with the current transform, so we
1650	// build a glyph-cache with the scale pre-applied, so that the cache contains
1651	// glyphs with the appropriate resolution in the case of retina displays.
1652	glyphCacheTransform = s->matrix.type() < QTransform::TxRotate ?
1653	QTransform::fromScale(dx: qAbs(t: s->matrix.m11()), dy: qAbs(t: s->matrix.m22())) :
1654	QTransform::fromScale(
1655	dx: QVector2D(s->matrix.m11(), s->matrix.m12()).length(),
1656	dy: QVector2D(s->matrix.m21(), s->matrix.m22()).length());
1657	}
1658
1659	QGLTextureGlyphCache *cache =
1660	(QGLTextureGlyphCache *) fe->glyphCache(key: cacheKey, format: glyphFormat, transform: glyphCacheTransform);
1661	if (!cache || cache->glyphFormat() != glyphFormat || cache->contextGroup() == 0) {
1662	cache = new QGLTextureGlyphCache(glyphFormat, glyphCacheTransform);
1663	fe->setGlyphCache(key: cacheKey, data: cache);
1664	recreateVertexArrays = true;
1665	}
1666
1667	if (staticTextItem->userDataNeedsUpdate) {
1668	recreateVertexArrays = true;
1669	} else if (staticTextItem->userData() == 0) {
1670	recreateVertexArrays = true;
1671	} else if (staticTextItem->userData()->type != QStaticTextUserData::OpenGLUserData) {
1672	recreateVertexArrays = true;
1673	} else {
1674	QOpenGLStaticTextUserData *userData = static_cast<QOpenGLStaticTextUserData *>(staticTextItem->userData());
1675	if (userData->glyphFormat != glyphFormat) {
1676	recreateVertexArrays = true;
1677	} else if (userData->cacheSerialNumber != cache->serialNumber()) {
1678	recreateVertexArrays = true;
1679	}
1680	}
1681
1682	// We only need to update the cache with new glyphs if we are actually going to recreate the vertex arrays.
1683	// If the cache size has changed, we do need to regenerate the vertices, but we don't need to repopulate the
1684	// cache so this text is performed before we test if the cache size has changed.
1685	if (recreateVertexArrays) {
1686	cache->setPaintEnginePrivate(this);
1687	if (!cache->populate(fontEngine: fe, numGlyphs: staticTextItem->numGlyphs,
1688	glyphs: staticTextItem->glyphs, positions: staticTextItem->glyphPositions)) {
1689	// No space for glyphs in cache. We need to reset it and try again.
1690	cache->clear();
1691	cache->populate(fontEngine: fe, numGlyphs: staticTextItem->numGlyphs,
1692	glyphs: staticTextItem->glyphs, positions: staticTextItem->glyphPositions);
1693	}
1694	cache->fillInPendingGlyphs();
1695	}
1696
1697	if (cache->width() == 0 || cache->height() == 0)
1698	return;
1699
1700	transferMode(newMode: TextDrawingMode);
1701
1702	int margin = fe->glyphMargin(format: glyphFormat);
1703
1704	GLfloat dx = 1.0 / cache->width();
1705	GLfloat dy = 1.0 / cache->height();
1706
1707	// Use global arrays by default
1708	QGL2PEXVertexArray *vertexCoordinates = &vertexCoordinateArray;
1709	QGL2PEXVertexArray *textureCoordinates = &textureCoordinateArray;
1710
1711	if (staticTextItem->useBackendOptimizations) {
1712	QOpenGLStaticTextUserData *userData = 0;
1713
1714	if (staticTextItem->userData() == 0
1715	|| staticTextItem->userData()->type != QStaticTextUserData::OpenGLUserData) {
1716
1717	userData = new QOpenGLStaticTextUserData();
1718	staticTextItem->setUserData(userData);
1719
1720	} else {
1721	userData = static_cast<QOpenGLStaticTextUserData*>(staticTextItem->userData());
1722	}
1723
1724	userData->glyphFormat = glyphFormat;
1725	userData->cacheSerialNumber = cache->serialNumber();
1726
1727	// Use cache if backend optimizations is turned on
1728	vertexCoordinates = &userData->vertexCoordinateArray;
1729	textureCoordinates = &userData->textureCoordinateArray;
1730
1731	QSize size(cache->width(), cache->height());
1732	if (userData->cacheSize != size) {
1733	recreateVertexArrays = true;
1734	userData->cacheSize = size;
1735	}
1736	}
1737
1738	if (recreateVertexArrays) {
1739	vertexCoordinates->clear();
1740	textureCoordinates->clear();
1741
1742	bool supportsSubPixelPositions = fe->supportsSubPixelPositions();
1743	for (int i=0; i<staticTextItem->numGlyphs; ++i) {
1744	QFixed subPixelPosition;
1745	if (supportsSubPixelPositions)
1746	subPixelPosition = fe->subPixelPositionForX(x: staticTextItem->glyphPositions[i].x);
1747
1748	QTextureGlyphCache::GlyphAndSubPixelPosition glyph(staticTextItem->glyphs[i], subPixelPosition);
1749
1750	const QTextureGlyphCache::Coord &c = cache->coords[glyph];
1751	if (c.isNull())
1752	continue;
1753
1754	int x = qFloor(v: staticTextItem->glyphPositions[i].x.toReal() * cache->transform().m11()) + c.baseLineX - margin;
1755	int y = qRound(d: staticTextItem->glyphPositions[i].y.toReal() * cache->transform().m22()) - c.baseLineY - margin;
1756
1757	vertexCoordinates->addQuad(rect: QRectF(x, y, c.w, c.h));
1758	textureCoordinates->addQuad(rect: QRectF(c.x*dx, c.y*dy, c.w * dx, c.h * dy));
1759	}
1760
1761	staticTextItem->userDataNeedsUpdate = false;
1762	}
1763
1764	int numGlyphs = vertexCoordinates->vertexCount() / 4;
1765	if (numGlyphs == 0)
1766	return;
1767
1768	if (elementIndices.size() < numGlyphs*6) {
1769	Q_ASSERT(elementIndices.size() % 6 == 0);
1770	int j = elementIndices.size() / 6 * 4;
1771	while (j < numGlyphs*4) {
1772	elementIndices.append(t: j + 0);
1773	elementIndices.append(t: j + 0);
1774	elementIndices.append(t: j + 1);
1775	elementIndices.append(t: j + 2);
1776	elementIndices.append(t: j + 3);
1777	elementIndices.append(t: j + 3);
1778
1779	j += 4;
1780	}
1781
1782	#if defined(QT_OPENGL_DRAWCACHEDGLYPHS_INDEX_ARRAY_VBO)
1783	if (elementIndicesVBOId == 0)
1784	glGenBuffers(1, &elementIndicesVBOId);
1785
1786	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elementIndicesVBOId);
1787	glBufferData(GL_ELEMENT_ARRAY_BUFFER, elementIndices.size() * sizeof(GLushort),
1788	elementIndices.constData(), GL_STATIC_DRAW);
1789	#endif
1790	} else {
1791	#if defined(QT_OPENGL_DRAWCACHEDGLYPHS_INDEX_ARRAY_VBO)
1792	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elementIndicesVBOId);
1793	#endif
1794	}
1795
1796	setVertexAttributePointer(arrayIndex: QT_VERTEX_COORDS_ATTR, pointer: (GLfloat*)vertexCoordinates->data());
1797	setVertexAttributePointer(arrayIndex: QT_TEXTURE_COORDS_ATTR, pointer: (GLfloat*)textureCoordinates->data());
1798
1799	if (!snapToPixelGrid) {
1800	snapToPixelGrid = true;
1801	matrixDirty = true;
1802	}
1803
1804	QBrush pensBrush = q->state()->pen.brush();
1805	setBrush(pensBrush);
1806
1807	if (glyphFormat == QFontEngine::Format_A32) {
1808
1809	// Subpixel antialiasing without gamma correction
1810
1811	QPainter::CompositionMode compMode = q->state()->composition_mode;
1812	Q_ASSERT(compMode == QPainter::CompositionMode_Source
1813	|| compMode == QPainter::CompositionMode_SourceOver);
1814
1815	shaderManager->setMaskType(QGLEngineShaderManager::SubPixelMaskPass1);
1816
1817	if (pensBrush.style() == Qt::SolidPattern) {
1818	// Solid patterns can get away with only one pass.
1819	QColor c = pensBrush.color();
1820	qreal oldOpacity = q->state()->opacity;
1821	if (compMode == QPainter::CompositionMode_Source) {
1822	c = qt_premultiplyColor(c, opacity: q->state()->opacity);
1823	q->state()->opacity = 1;
1824	opacityUniformDirty = true;
1825	}
1826
1827	compositionModeDirty = false; // I can handle this myself, thank you very much
1828	prepareForCachedGlyphDraw(cache: *cache);
1829
1830	// prepareForCachedGlyphDraw() have set the opacity on the current shader, so the opacity state can now be reset.
1831	if (compMode == QPainter::CompositionMode_Source) {
1832	q->state()->opacity = oldOpacity;
1833	opacityUniformDirty = true;
1834	}
1835
1836	glEnable(GL_BLEND);
1837	glBlendFunc(GL_CONSTANT_COLOR, GL_ONE_MINUS_SRC_COLOR);
1838	glBlendColor(red: c.redF(), green: c.greenF(), blue: c.blueF(), alpha: c.alphaF());
1839	} else {
1840	// Other brush styles need two passes.
1841
1842	qreal oldOpacity = q->state()->opacity;
1843	if (compMode == QPainter::CompositionMode_Source) {
1844	q->state()->opacity = 1;
1845	opacityUniformDirty = true;
1846	pensBrush = Qt::white;
1847	setBrush(pensBrush);
1848	}
1849
1850	compositionModeDirty = false; // I can handle this myself, thank you very much
1851	prepareForCachedGlyphDraw(cache: *cache);
1852	glEnable(GL_BLEND);
1853	glBlendFunc(GL_ZERO, GL_ONE_MINUS_SRC_COLOR);
1854
1855	glActiveTexture(GL_TEXTURE0 + QT_MASK_TEXTURE_UNIT);
1856	glBindTexture(GL_TEXTURE_2D, texture: cache->texture());
1857	updateTextureFilter(GL_TEXTURE_2D, GL_REPEAT, smoothPixmapTransform: false);
1858
1859	#if defined(QT_OPENGL_DRAWCACHEDGLYPHS_INDEX_ARRAY_VBO)
1860	glDrawElements(GL_TRIANGLE_STRIP, 6 * numGlyphs, GL_UNSIGNED_SHORT, 0);
1861	#else
1862	glDrawElements(GL_TRIANGLE_STRIP, count: 6 * numGlyphs, GL_UNSIGNED_SHORT, indices: elementIndices.data());
1863	#endif
1864
1865	shaderManager->setMaskType(QGLEngineShaderManager::SubPixelMaskPass2);
1866
1867	if (compMode == QPainter::CompositionMode_Source) {
1868	q->state()->opacity = oldOpacity;
1869	opacityUniformDirty = true;
1870	pensBrush = q->state()->pen.brush();
1871	setBrush(pensBrush);
1872	}
1873
1874	compositionModeDirty = false;
1875	prepareForCachedGlyphDraw(cache: *cache);
1876	glEnable(GL_BLEND);
1877	glBlendFunc(GL_ONE, GL_ONE);
1878	}
1879	compositionModeDirty = true;
1880	} else {
1881	// Grayscale/mono glyphs
1882
1883	shaderManager->setMaskType(QGLEngineShaderManager::PixelMask);
1884	prepareForCachedGlyphDraw(cache: *cache);
1885	}
1886
1887	QGLTextureGlyphCache::FilterMode filterMode = (s->matrix.type() > QTransform::TxTranslate)?QGLTextureGlyphCache::Linear:QGLTextureGlyphCache::Nearest;
1888	if (lastMaskTextureUsed != cache->texture() || cache->filterMode() != filterMode) {
1889
1890	glActiveTexture(GL_TEXTURE0 + QT_MASK_TEXTURE_UNIT);
1891	if (lastMaskTextureUsed != cache->texture()) {
1892	glBindTexture(GL_TEXTURE_2D, texture: cache->texture());
1893	lastMaskTextureUsed = cache->texture();
1894	}
1895
1896	if (cache->filterMode() != filterMode) {
1897	if (filterMode == QGLTextureGlyphCache::Linear) {
1898	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
1899	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1900	} else {
1901	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
1902	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
1903	}
1904	cache->setFilterMode(filterMode);
1905	}
1906	}
1907
1908	#if defined(QT_OPENGL_DRAWCACHEDGLYPHS_INDEX_ARRAY_VBO)
1909	glDrawElements(GL_TRIANGLE_STRIP, 6 * numGlyphs, GL_UNSIGNED_SHORT, 0);
1910	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
1911	#else
1912	glDrawElements(GL_TRIANGLE_STRIP, count: 6 * numGlyphs, GL_UNSIGNED_SHORT, indices: elementIndices.data());
1913	#endif
1914	}
1915
1916	void QGL2PaintEngineEx::drawPixmapFragments(const QPainter::PixmapFragment *fragments, int fragmentCount, const QPixmap &pixmap,
1917	QPainter::PixmapFragmentHints hints)
1918	{
1919	Q_D(QGL2PaintEngineEx);
1920	// Use fallback for extended composition modes.
1921	if (state()->composition_mode > QPainter::CompositionMode_Plus) {
1922	QPaintEngineEx::drawPixmapFragments(fragments, fragmentCount, pixmap, hints);
1923	return;
1924	}
1925
1926	ensureActive();
1927	int max_texture_size = d->ctx->d_func()->maxTextureSize();
1928	if (pixmap.width() > max_texture_size || pixmap.height() > max_texture_size) {
1929	QPixmap scaled = pixmap.scaled(w: max_texture_size, h: max_texture_size, aspectMode: Qt::KeepAspectRatio);
1930	d->drawPixmapFragments(fragments, fragmentCount, pixmap: scaled, hints);
1931	} else {
1932	d->drawPixmapFragments(fragments, fragmentCount, pixmap, hints);
1933	}
1934	}
1935
1936
1937	void QGL2PaintEngineExPrivate::drawPixmapFragments(const QPainter::PixmapFragment *fragments,
1938	int fragmentCount, const QPixmap &pixmap,
1939	QPainter::PixmapFragmentHints hints)
1940	{
1941	GLfloat dx = 1.0f / pixmap.size().width();
1942	GLfloat dy = 1.0f / pixmap.size().height();
1943
1944	vertexCoordinateArray.clear();
1945	textureCoordinateArray.clear();
1946	opacityArray.reset();
1947
1948	if (snapToPixelGrid) {
1949	snapToPixelGrid = false;
1950	matrixDirty = true;
1951	}
1952
1953	bool allOpaque = true;
1954
1955	for (int i = 0; i < fragmentCount; ++i) {
1956	qreal s = 0;
1957	qreal c = 1;
1958	if (fragments[i].rotation != 0) {
1959	s = qFastSin(x: qDegreesToRadians(degrees: fragments[i].rotation));
1960	c = qFastCos(x: qDegreesToRadians(degrees: fragments[i].rotation));
1961	}
1962
1963	qreal right = 0.5 * fragments[i].scaleX * fragments[i].width;
1964	qreal bottom = 0.5 * fragments[i].scaleY * fragments[i].height;
1965	QGLPoint bottomRight(right * c - bottom * s, right * s + bottom * c);
1966	QGLPoint bottomLeft(-right * c - bottom * s, -right * s + bottom * c);
1967
1968	vertexCoordinateArray.addVertex(x: bottomRight.x + fragments[i].x, y: bottomRight.y + fragments[i].y);
1969	vertexCoordinateArray.addVertex(x: -bottomLeft.x + fragments[i].x, y: -bottomLeft.y + fragments[i].y);
1970	vertexCoordinateArray.addVertex(x: -bottomRight.x + fragments[i].x, y: -bottomRight.y + fragments[i].y);
1971	vertexCoordinateArray.addVertex(x: -bottomRight.x + fragments[i].x, y: -bottomRight.y + fragments[i].y);
1972	vertexCoordinateArray.addVertex(x: bottomLeft.x + fragments[i].x, y: bottomLeft.y + fragments[i].y);
1973	vertexCoordinateArray.addVertex(x: bottomRight.x + fragments[i].x, y: bottomRight.y + fragments[i].y);
1974
1975	QGLRect src(fragments[i].sourceLeft * dx, fragments[i].sourceTop * dy,
1976	(fragments[i].sourceLeft + fragments[i].width) * dx,
1977	(fragments[i].sourceTop + fragments[i].height) * dy);
1978
1979	textureCoordinateArray.addVertex(x: src.right, y: src.bottom);
1980	textureCoordinateArray.addVertex(x: src.right, y: src.top);
1981	textureCoordinateArray.addVertex(x: src.left, y: src.top);
1982	textureCoordinateArray.addVertex(x: src.left, y: src.top);
1983	textureCoordinateArray.addVertex(x: src.left, y: src.bottom);
1984	textureCoordinateArray.addVertex(x: src.right, y: src.bottom);
1985
1986	qreal opacity = fragments[i].opacity * q->state()->opacity;
1987	opacityArray << opacity << opacity << opacity << opacity << opacity << opacity;
1988	allOpaque &= (opacity >= 0.99f);
1989	}
1990
1991	glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
1992	QGLTexture *texture = ctx->d_func()->bindTexture(pixmap, GL_TEXTURE_2D, GL_RGBA,
1993	options: QGLContext::InternalBindOption
1994	| QGLContext::CanFlipNativePixmapBindOption);
1995
1996	if (texture->options & QGLContext::InvertedYBindOption) {
1997	// Flip texture y-coordinate.
1998	QGLPoint *data = textureCoordinateArray.data();
1999	for (int i = 0; i < 6 * fragmentCount; ++i)
2000	data[i].y = 1 - data[i].y;
2001	}
2002
2003	transferMode(newMode: ImageArrayDrawingMode);
2004
2005	bool isBitmap = pixmap.isQBitmap();
2006	bool isOpaque = !isBitmap && (!pixmap.hasAlpha() || (hints & QPainter::OpaqueHint)) && allOpaque;
2007
2008	updateTextureFilter(GL_TEXTURE_2D, GL_CLAMP_TO_EDGE,
2009	smoothPixmapTransform: q->state()->renderHints & QPainter::SmoothPixmapTransform, id: texture->id);
2010
2011	// Setup for texture drawing
2012	currentBrush = noBrush;
2013	shaderManager->setSrcPixelType(isBitmap ? QGLEngineShaderManager::PatternSrc
2014	: QGLEngineShaderManager::ImageSrc);
2015	if (prepareForDraw(srcPixelsAreOpaque: isOpaque))
2016	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::ImageTexture), QT_IMAGE_TEXTURE_UNIT);
2017
2018	if (isBitmap) {
2019	QColor col = qt_premultiplyColor(c: q->state()->pen.color(), opacity: (GLfloat)q->state()->opacity);
2020	shaderManager->currentProgram()->setUniformValue(location: location(uniform: QGLEngineShaderManager::PatternColor), color: col);
2021	}
2022
2023	glDrawArrays(GL_TRIANGLES, first: 0, count: 6 * fragmentCount);
2024	}
2025
2026	bool QGL2PaintEngineEx::begin(QPaintDevice *pdev)
2027	{
2028	Q_D(QGL2PaintEngineEx);
2029
2030	// qDebug("QGL2PaintEngineEx::begin()");
2031	if (pdev->devType() == QInternal::OpenGL)
2032	d->device = static_cast<QGLPaintDevice*>(pdev);
2033	else
2034	d->device = QGLPaintDevice::getDevice(pdev);
2035
2036	if (!d->device)
2037	return false;
2038
2039	d->ctx = d->device->context();
2040	d->ctx->d_ptr->active_engine = this;
2041
2042	d->resetOpenGLContextActiveEngine();
2043
2044	const QSize sz = d->device->size();
2045	d->width = sz.width();
2046	d->height = sz.height();
2047	d->mode = BrushDrawingMode;
2048	d->brushTextureDirty = true;
2049	d->brushUniformsDirty = true;
2050	d->matrixUniformDirty = true;
2051	d->matrixDirty = true;
2052	d->compositionModeDirty = true;
2053	d->opacityUniformDirty = true;
2054	d->translateZUniformDirty = true;
2055	d->needsSync = true;
2056	d->useSystemClip = !systemClip().isEmpty();
2057	d->currentBrush = QBrush();
2058
2059	d->dirtyStencilRegion = QRect(0, 0, d->width, d->height);
2060	d->stencilClean = true;
2061
2062	// Calling begin paint should make the correct context current. So, any
2063	// code which calls into GL or otherwise needs a current context *must*
2064	// go after beginPaint:
2065	d->device->beginPaint();
2066
2067	d->initializeOpenGLFunctions();
2068
2069	d->shaderManager = new QGLEngineShaderManager(d->ctx);
2070
2071	d->glDisable(GL_STENCIL_TEST);
2072	d->glDisable(GL_DEPTH_TEST);
2073	d->glDisable(GL_SCISSOR_TEST);
2074
2075	#if !defined(QT_OPENGL_ES_2)
2076	if (!d->ctx->contextHandle()->isOpenGLES())
2077	d->glDisable(GL_MULTISAMPLE);
2078	#endif
2079
2080	d->glyphCacheFormat = QFontEngine::Format_A8;
2081
2082	#if !defined(QT_OPENGL_ES_2)
2083	if (!d->ctx->contextHandle()->isOpenGLES()) {
2084	d->glyphCacheFormat = QFontEngine::Format_A32;
2085	d->multisamplingAlwaysEnabled = false;
2086	} else {
2087	d->multisamplingAlwaysEnabled = d->device->format().sampleBuffers();
2088	}
2089	#else
2090	// OpenGL ES can't switch MSAA off, so if the gl paint device is
2091	// multisampled, it's always multisampled.
2092	d->multisamplingAlwaysEnabled = d->device->format().sampleBuffers();
2093	#endif
2094
2095	return true;
2096	}
2097
2098	bool QGL2PaintEngineEx::end()
2099	{
2100	Q_D(QGL2PaintEngineEx);
2101
2102	QGLContext *ctx = d->ctx;
2103	d->glUseProgram(program: 0);
2104	d->transferMode(newMode: BrushDrawingMode);
2105	d->device->endPaint();
2106
2107	ctx->d_ptr->active_engine = 0;
2108	ctx->makeCurrent();
2109	d->resetOpenGLContextActiveEngine();
2110	d->resetGLState();
2111
2112	delete d->shaderManager;
2113	d->shaderManager = 0;
2114	d->currentBrush = QBrush();
2115
2116	#ifdef QT_OPENGL_CACHE_AS_VBOS
2117	if (!d->unusedVBOSToClean.isEmpty()) {
2118	d->glDeleteBuffers(d->unusedVBOSToClean.size(), d->unusedVBOSToClean.constData());
2119	d->unusedVBOSToClean.clear();
2120	}
2121	if (!d->unusedIBOSToClean.isEmpty()) {
2122	d->glDeleteBuffers(d->unusedIBOSToClean.size(), d->unusedIBOSToClean.constData());
2123	d->unusedIBOSToClean.clear();
2124	}
2125	#endif
2126
2127	return false;
2128	}
2129
2130	void QGL2PaintEngineEx::ensureActive()
2131	{
2132	Q_D(QGL2PaintEngineEx);
2133	QGLContext *ctx = d->ctx;
2134
2135	if (isActive() && (ctx->d_ptr->active_engine != this || d->resetOpenGLContextActiveEngine())) {
2136	ctx->d_ptr->active_engine = this;
2137	d->needsSync = true;
2138	}
2139
2140	d->device->ensureActiveTarget();
2141
2142	if (d->needsSync) {
2143	d->transferMode(newMode: BrushDrawingMode);
2144	d->glViewport(x: 0, y: 0, width: d->width, height: d->height);
2145	d->needsSync = false;
2146	d->lastMaskTextureUsed = 0;
2147	d->shaderManager->setDirty();
2148	d->ctx->d_func()->syncGlState();
2149	for (int i = 0; i < 3; ++i)
2150	d->vertexAttribPointers[i] = (GLfloat*)-1; // Assume the pointers are clobbered
2151	setState(state());
2152	}
2153	}
2154
2155	void QGL2PaintEngineExPrivate::updateClipScissorTest()
2156	{
2157	Q_Q(QGL2PaintEngineEx);
2158	if (q->state()->clipTestEnabled) {
2159	glEnable(GL_STENCIL_TEST);
2160	glStencilFunc(GL_LEQUAL, ref: q->state()->currentClip, mask: ~GL_STENCIL_HIGH_BIT);
2161	} else {
2162	glDisable(GL_STENCIL_TEST);
2163	glStencilFunc(GL_ALWAYS, ref: 0, mask: 0xff);
2164	}
2165
2166	#ifdef QT_GL_NO_SCISSOR_TEST
2167	currentScissorBounds = QRect(0, 0, width, height);
2168	#else
2169	QRect bounds = q->state()->rectangleClip;
2170	if (!q->state()->clipEnabled) {
2171	if (useSystemClip)
2172	bounds = systemClip.boundingRect();
2173	else
2174	bounds = QRect(0, 0, width, height);
2175	} else {
2176	if (useSystemClip)
2177	bounds = bounds.intersected(other: systemClip.boundingRect());
2178	else
2179	bounds = bounds.intersected(other: QRect(0, 0, width, height));
2180	}
2181
2182	currentScissorBounds = bounds;
2183
2184	if (bounds == QRect(0, 0, width, height)) {
2185	glDisable(GL_SCISSOR_TEST);
2186	} else {
2187	glEnable(GL_SCISSOR_TEST);
2188	setScissor(bounds);
2189	}
2190	#endif
2191	}
2192
2193	void QGL2PaintEngineExPrivate::setScissor(const QRect &rect)
2194	{
2195	const int left = rect.left();
2196	const int width = rect.width();
2197	int bottom = height - (rect.top() + rect.height());
2198	if (device->isFlipped()) {
2199	bottom = rect.top();
2200	}
2201	const int height = rect.height();
2202
2203	glScissor(x: left, y: bottom, width, height);
2204	}
2205
2206	void QGL2PaintEngineEx::clipEnabledChanged()
2207	{
2208	Q_D(QGL2PaintEngineEx);
2209
2210	state()->clipChanged = true;
2211
2212	if (painter()->hasClipping())
2213	d->regenerateClip();
2214	else
2215	d->systemStateChanged();
2216	}
2217
2218	void QGL2PaintEngineExPrivate::clearClip(uint value)
2219	{
2220	dirtyStencilRegion -= currentScissorBounds;
2221
2222	glStencilMask(mask: 0xff);
2223	glClearStencil(s: value);
2224	glClear(GL_STENCIL_BUFFER_BIT);
2225	glStencilMask(mask: 0x0);
2226
2227	q->state()->needsClipBufferClear = false;
2228	}
2229
2230	void QGL2PaintEngineExPrivate::writeClip(const QVectorPath &path, uint value)
2231	{
2232	transferMode(newMode: BrushDrawingMode);
2233
2234	if (snapToPixelGrid) {
2235	snapToPixelGrid = false;
2236	matrixDirty = true;
2237	}
2238
2239	if (matrixDirty)
2240	updateMatrix();
2241
2242	stencilClean = false;
2243
2244	const bool singlePass = !path.hasWindingFill()
2245	&& (((q->state()->currentClip == maxClip - 1) && q->state()->clipTestEnabled)
2246	|| q->state()->needsClipBufferClear);
2247	const uint referenceClipValue = q->state()->needsClipBufferClear ? 1 : q->state()->currentClip;
2248
2249	if (q->state()->needsClipBufferClear)
2250	clearClip(value: 1);
2251
2252	if (path.isEmpty()) {
2253	glEnable(GL_STENCIL_TEST);
2254	glStencilFunc(GL_LEQUAL, ref: value, mask: ~GL_STENCIL_HIGH_BIT);
2255	return;
2256	}
2257
2258	if (q->state()->clipTestEnabled)
2259	glStencilFunc(GL_LEQUAL, ref: q->state()->currentClip, mask: ~GL_STENCIL_HIGH_BIT);
2260	else
2261	glStencilFunc(GL_ALWAYS, ref: 0, mask: 0xff);
2262
2263	vertexCoordinateArray.clear();
2264	vertexCoordinateArray.addPath(path, curveInverseScale: inverseScale, outline: false);
2265
2266	if (!singlePass)
2267	fillStencilWithVertexArray(vertexArray&: vertexCoordinateArray, useWindingFill: path.hasWindingFill());
2268
2269	glColorMask(red: false, green: false, blue: false, alpha: false);
2270	glEnable(GL_STENCIL_TEST);
2271	useSimpleShader();
2272
2273	if (singlePass) {
2274	// Under these conditions we can set the new stencil value in a single
2275	// pass, by using the current value and the "new value" as the toggles
2276
2277	glStencilFunc(GL_LEQUAL, ref: referenceClipValue, mask: ~GL_STENCIL_HIGH_BIT);
2278	glStencilOp(GL_KEEP, GL_INVERT, GL_INVERT);
2279	glStencilMask(mask: value ^ referenceClipValue);
2280
2281	drawVertexArrays(vertexArray&: vertexCoordinateArray, GL_TRIANGLE_FAN);
2282	} else {
2283	glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE);
2284	glStencilMask(mask: 0xff);
2285
2286	if (!q->state()->clipTestEnabled && path.hasWindingFill()) {
2287	// Pass when any clip bit is set, set high bit
2288	glStencilFunc(GL_NOTEQUAL, GL_STENCIL_HIGH_BIT, mask: ~GL_STENCIL_HIGH_BIT);
2289	composite(boundingRect: vertexCoordinateArray.boundingRect());
2290	}
2291
2292	// Pass when high bit is set, replace stencil value with new clip value
2293	glStencilFunc(GL_NOTEQUAL, ref: value, GL_STENCIL_HIGH_BIT);
2294
2295	composite(boundingRect: vertexCoordinateArray.boundingRect());
2296	}
2297
2298	glStencilFunc(GL_LEQUAL, ref: value, mask: ~GL_STENCIL_HIGH_BIT);
2299	glStencilMask(mask: 0);
2300
2301	glColorMask(red: true, green: true, blue: true, alpha: true);
2302	}
2303
2304	void QGL2PaintEngineEx::clip(const QVectorPath &path, Qt::ClipOperation op)
2305	{
2306	// qDebug("QGL2PaintEngineEx::clip()");
2307	Q_D(QGL2PaintEngineEx);
2308
2309	state()->clipChanged = true;
2310
2311	ensureActive();
2312
2313	if (op == Qt::ReplaceClip) {
2314	op = Qt::IntersectClip;
2315	if (d->hasClipOperations()) {
2316	d->systemStateChanged();
2317	state()->canRestoreClip = false;
2318	}
2319	}
2320
2321	#ifndef QT_GL_NO_SCISSOR_TEST
2322	if (!path.isEmpty() && op == Qt::IntersectClip && (path.shape() == QVectorPath::RectangleHint)) {
2323	const QPointF* const points = reinterpret_cast<const QPointF*>(path.points());
2324	QRectF rect(points[0], points[2]);
2325
2326	if (state()->matrix.type() <= QTransform::TxScale
2327	|| (state()->matrix.type() == QTransform::TxRotate
2328	&& qFuzzyIsNull(d: state()->matrix.m11())
2329	&& qFuzzyIsNull(d: state()->matrix.m22())))
2330	{
2331	state()->rectangleClip = state()->rectangleClip.intersected(other: state()->matrix.mapRect(rect).toRect());
2332	d->updateClipScissorTest();
2333	return;
2334	}
2335	}
2336	#endif
2337
2338	const QRect pathRect = state()->matrix.mapRect(path.controlPointRect()).toAlignedRect();
2339
2340	switch (op) {
2341	case Qt::NoClip:
2342	if (d->useSystemClip) {
2343	state()->clipTestEnabled = true;
2344	state()->currentClip = 1;
2345	} else {
2346	state()->clipTestEnabled = false;
2347	}
2348	state()->rectangleClip = QRect(0, 0, d->width, d->height);
2349	state()->canRestoreClip = false;
2350	d->updateClipScissorTest();
2351	break;
2352	case Qt::IntersectClip:
2353	state()->rectangleClip = state()->rectangleClip.intersected(other: pathRect);
2354	d->updateClipScissorTest();
2355	d->resetClipIfNeeded();
2356	++d->maxClip;
2357	d->writeClip(path, value: d->maxClip);
2358	state()->currentClip = d->maxClip;
2359	state()->clipTestEnabled = true;
2360	break;
2361	default:
2362	break;
2363	}
2364	}
2365
2366	void QGL2PaintEngineExPrivate::regenerateClip()
2367	{
2368	systemStateChanged();
2369	replayClipOperations();
2370	}
2371
2372	void QGL2PaintEngineExPrivate::systemStateChanged()
2373	{
2374	Q_Q(QGL2PaintEngineEx);
2375
2376	q->state()->clipChanged = true;
2377
2378	if (systemClip.isEmpty()) {
2379	useSystemClip = false;
2380	} else {
2381	if (q->paintDevice()->devType() == QInternal::Widget && currentClipDevice) {
2382	QWidgetPrivate *widgetPrivate = qt_widget_private(widget: static_cast<QWidget *>(currentClipDevice)->window());
2383	useSystemClip = widgetPrivate->extra && widgetPrivate->extra->inRenderWithPainter;
2384	} else {
2385	useSystemClip = true;
2386	}
2387	}
2388
2389	q->state()->clipTestEnabled = false;
2390	q->state()->needsClipBufferClear = true;
2391
2392	q->state()->currentClip = 1;
2393	maxClip = 1;
2394
2395	q->state()->rectangleClip = useSystemClip ? systemClip.boundingRect() : QRect(0, 0, width, height);
2396	updateClipScissorTest();
2397
2398	if (systemClip.rectCount() == 1) {
2399	if (systemClip.boundingRect() == QRect(0, 0, width, height))
2400	useSystemClip = false;
2401	#ifndef QT_GL_NO_SCISSOR_TEST
2402	// scissoring takes care of the system clip
2403	return;
2404	#endif
2405	}
2406
2407	if (useSystemClip) {
2408	clearClip(value: 0);
2409
2410	QPainterPath path;
2411	path.addRegion(region: systemClip);
2412
2413	q->state()->currentClip = 0;
2414	writeClip(path: qtVectorPathForPath(path: q->state()->matrix.inverted().map(p: path)), value: 1);
2415	q->state()->currentClip = 1;
2416	q->state()->clipTestEnabled = true;
2417	}
2418	}
2419
2420	void QGL2PaintEngineEx::setTranslateZ(GLfloat z)
2421	{
2422	Q_D(QGL2PaintEngineEx);
2423	if (d->translateZ != z) {
2424	d->translateZ = z;
2425	d->translateZUniformDirty = true;
2426	}
2427	}
2428
2429	void QGL2PaintEngineEx::setState(QPainterState *new_state)
2430	{
2431	// qDebug("QGL2PaintEngineEx::setState()");
2432
2433	Q_D(QGL2PaintEngineEx);
2434
2435	QGL2PaintEngineState *s = static_cast<QGL2PaintEngineState *>(new_state);
2436	QGL2PaintEngineState *old_state = state();
2437
2438	QPaintEngineEx::setState(s);
2439
2440	if (s->isNew) {
2441	// Newly created state object. The call to setState()
2442	// will either be followed by a call to begin(), or we are
2443	// setting the state as part of a save().
2444	s->isNew = false;
2445	return;
2446	}
2447
2448	// Setting the state as part of a restore().
2449
2450	if (old_state == s || old_state->renderHintsChanged)
2451	renderHintsChanged();
2452
2453	if (old_state == s || old_state->matrixChanged)
2454	d->matrixDirty = true;
2455
2456	if (old_state == s || old_state->compositionModeChanged)
2457	d->compositionModeDirty = true;
2458
2459	if (old_state == s || old_state->opacityChanged)
2460	d->opacityUniformDirty = true;
2461
2462	if (old_state == s || old_state->clipChanged) {
2463	if (old_state && old_state != s && old_state->canRestoreClip) {
2464	d->updateClipScissorTest();
2465	d->glDepthFunc(GL_LEQUAL);
2466	} else {
2467	d->regenerateClip();
2468	}
2469	}
2470	}
2471
2472	QPainterState *QGL2PaintEngineEx::createState(QPainterState *orig) const
2473	{
2474	if (orig)
2475	const_cast<QGL2PaintEngineEx *>(this)->ensureActive();
2476
2477	QGL2PaintEngineState *s;
2478	if (!orig)
2479	s = new QGL2PaintEngineState();
2480	else
2481	s = new QGL2PaintEngineState(*static_cast<QGL2PaintEngineState *>(orig));
2482
2483	s->matrixChanged = false;
2484	s->compositionModeChanged = false;
2485	s->opacityChanged = false;
2486	s->renderHintsChanged = false;
2487	s->clipChanged = false;
2488
2489	return s;
2490	}
2491
2492	QGL2PaintEngineState::QGL2PaintEngineState(QGL2PaintEngineState &other)
2493	: QPainterState(other)
2494	{
2495	isNew = true;
2496	needsClipBufferClear = other.needsClipBufferClear;
2497	clipTestEnabled = other.clipTestEnabled;
2498	currentClip = other.currentClip;
2499	canRestoreClip = other.canRestoreClip;
2500	rectangleClip = other.rectangleClip;
2501	}
2502
2503	QGL2PaintEngineState::QGL2PaintEngineState()
2504	{
2505	isNew = true;
2506	needsClipBufferClear = true;
2507	clipTestEnabled = false;
2508	canRestoreClip = true;
2509	}
2510
2511	QGL2PaintEngineState::~QGL2PaintEngineState()
2512	{
2513	}
2514
2515	QT_END_NAMESPACE
2516