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qtdeclarative/src/quick/items/context2d/qquickcontext2dtexture.cpp

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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQuick module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qquickcontext2dtexture_p.h"
#include "qquickcontext2dtile_p.h"
#include "qquickcanvasitem_p.h"
#include <private/qquickitem_p.h>
#include <QtQuick/private/qsgtexture_p.h>
#include "qquickcontext2dcommandbuffer_p.h"
#include <QOpenGLPaintDevice>
#if QT_CONFIG(opengl)
#include <QOpenGLFramebufferObject>
#include <QOpenGLFramebufferObjectFormat>
#include <QOpenGLFunctions>
#include <QtGui/private/qopenglextensions_p.h>
#endif
#include <QtCore/QThread>
#include <QtGui/QGuiApplication>
QT_BEGIN_NAMESPACE
#if QT_CONFIG(opengl)
#define QT_MINIMUM_FBO_SIZE 64
static inline int qt_next_power_of_two(int v)
{
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
++v;
return v;
}
struct GLAcquireContext {
GLAcquireContext(QOpenGLContext *c, QSurface *s):ctx(c) {
if (ctx) {
Q_ASSERT(s);
if (!ctx->isValid())
ctx->create();
if (!ctx->isValid())
qWarning() << "Unable to create GL context";
else if (!ctx->makeCurrent(s))
qWarning() << "Can't make current GL context";
}
}
~GLAcquireContext() {
if (ctx)
ctx->doneCurrent();
}
QOpenGLContext *ctx;
};
#endif
QQuickContext2DTexture::QQuickContext2DTexture()
: m_context(0)
#if QT_CONFIG(opengl)
, m_gl(0)
#endif
, m_surface(0)
, m_item(0)
, m_canvasWindowChanged(false)
, m_dirtyTexture(false)
, m_smooth(true)
, m_antialiasing(false)
, m_tiledCanvas(false)
, m_painting(false)
{
}
QQuickContext2DTexture::~QQuickContext2DTexture()
{
clearTiles();
}
void QQuickContext2DTexture::markDirtyTexture()
{
if (m_onCustomThread)
m_mutex.lock();
m_dirtyTexture = true;
emit textureChanged();
if (m_onCustomThread)
m_mutex.unlock();
}
bool QQuickContext2DTexture::setCanvasSize(const QSize &size)
{
if (m_canvasSize != size) {
m_canvasSize = size;
return true;
}
return false;
}
bool QQuickContext2DTexture::setTileSize(const QSize &size)
{
if (m_tileSize != size) {
m_tileSize = size;
return true;
}
return false;
}
void QQuickContext2DTexture::setSmooth(bool smooth)
{
m_smooth = smooth;
}
void QQuickContext2DTexture::setAntialiasing(bool antialiasing)
{
m_antialiasing = antialiasing;
}
void QQuickContext2DTexture::setItem(QQuickCanvasItem* item)
{
m_item = item;
if (m_item) {
m_context = (QQuickContext2D*) item->rawContext(); // FIXME
m_state = m_context->state;
} else {
m_context = 0;
}
}
bool QQuickContext2DTexture::setCanvasWindow(const QRect& r)
{
if (m_canvasWindow != r) {
m_canvasWindow = r;
m_canvasWindowChanged = true;
return true;
}
return false;
}
bool QQuickContext2DTexture::setDirtyRect(const QRect &r)
{
bool doDirty = false;
if (m_tiledCanvas) {
for (QQuickContext2DTile* t : qAsConst(m_tiles)) {
bool dirty = t->rect().intersected(r).isValid();
t->markDirty(dirty);
if (dirty)
doDirty = true;
}
} else {
doDirty = m_canvasWindow.intersected(r).isValid();
}
return doDirty;
}
void QQuickContext2DTexture::canvasChanged(const QSize& canvasSize, const QSize& tileSize, const QRect& canvasWindow, const QRect& dirtyRect, bool smooth, bool antialiasing)
{
QSize ts = tileSize;
if (ts.width() > canvasSize.width())
ts.setWidth(canvasSize.width());
if (ts.height() > canvasSize.height())
ts.setHeight(canvasSize.height());
setCanvasSize(canvasSize);
setTileSize(ts);
setCanvasWindow(canvasWindow);
if (canvasSize == canvasWindow.size()) {
m_tiledCanvas = false;
} else {
m_tiledCanvas = true;
}
if (dirtyRect.isValid())
setDirtyRect(dirtyRect);
setSmooth(smooth);
setAntialiasing(antialiasing);
}
void QQuickContext2DTexture::paintWithoutTiles(QQuickContext2DCommandBuffer *ccb)
{
if (!ccb || ccb->isEmpty())
return;
QPaintDevice* device = beginPainting();
if (!device) {
endPainting();
return;
}
QPainter p;
p.begin(device);
if (m_antialiasing)
p.setRenderHints(QPainter::Antialiasing | QPainter::HighQualityAntialiasing | QPainter::TextAntialiasing, true);
else
p.setRenderHints(QPainter::Antialiasing | QPainter::HighQualityAntialiasing | QPainter::TextAntialiasing, false);
if (m_smooth)
p.setRenderHint(QPainter::SmoothPixmapTransform, true);
else
p.setRenderHint(QPainter::SmoothPixmapTransform, false);
p.setCompositionMode(QPainter::CompositionMode_SourceOver);
ccb->replay(&p, m_state, scaleFactor());
endPainting();
markDirtyTexture();
}
bool QQuickContext2DTexture::canvasDestroyed()
{
return m_item == 0;
}
void QQuickContext2DTexture::paint(QQuickContext2DCommandBuffer *ccb)
{
QQuickContext2D::mutex.lock();
if (canvasDestroyed()) {
delete ccb;
QQuickContext2D::mutex.unlock();
return;
}
QQuickContext2D::mutex.unlock();
#if QT_CONFIG(opengl)
GLAcquireContext currentContext(m_gl, m_surface);
#endif
if (!m_tiledCanvas) {
paintWithoutTiles(ccb);
delete ccb;
return;
}
QRect tiledRegion = createTiles(m_canvasWindow.intersected(QRect(QPoint(0, 0), m_canvasSize)));
if (!tiledRegion.isEmpty()) {
QRect dirtyRect;
for (QQuickContext2DTile* tile : qAsConst(m_tiles)) {
if (tile->dirty()) {
if (dirtyRect.isEmpty())
dirtyRect = tile->rect();
else
dirtyRect |= tile->rect();
}
}
if (beginPainting()) {
QQuickContext2D::State oldState = m_state;
for (QQuickContext2DTile* tile : qAsConst(m_tiles)) {
if (tile->dirty()) {
ccb->replay(tile->createPainter(m_smooth, m_antialiasing), oldState, scaleFactor());
tile->drawFinished();
tile->markDirty(false);
}
compositeTile(tile);
}
endPainting();
m_state = oldState;
markDirtyTexture();
}
}
delete ccb;
}
QRect QQuickContext2DTexture::tiledRect(const QRectF& window, const QSize& tileSize)
{
if (window.isEmpty())
return QRect();
const int tw = tileSize.width();
const int th = tileSize.height();
const int h1 = window.left() / tw;
const int v1 = window.top() / th;
const int htiles = ((window.right() - h1 * tw) + tw - 1)/tw;
const int vtiles = ((window.bottom() - v1 * th) + th - 1)/th;
return QRect(h1 * tw, v1 * th, htiles * tw, vtiles * th);
}
QRect QQuickContext2DTexture::createTiles(const QRect& window)
{
QList<QQuickContext2DTile*> oldTiles = m_tiles;
m_tiles.clear();
if (window.isEmpty()) {
return QRect();
}
QRect r = tiledRect(window, adjustedTileSize(m_tileSize));
const int tw = m_tileSize.width();
const int th = m_tileSize.height();
const int h1 = window.left() / tw;
const int v1 = window.top() / th;
const int htiles = r.width() / tw;
const int vtiles = r.height() / th;
for (int yy = 0; yy < vtiles; ++yy) {
for (int xx = 0; xx < htiles; ++xx) {
int ht = xx + h1;
int vt = yy + v1;
QQuickContext2DTile* tile = 0;
QPoint pos(ht * tw, vt * th);
QRect rect(pos, m_tileSize);
for (int i = 0; i < oldTiles.size(); i++) {
if (oldTiles[i]->rect() == rect) {
tile = oldTiles.takeAt(i);
break;
}
}
if (!tile)
tile = createTile();
tile->setRect(rect);
m_tiles.append(tile);
}
}
qDeleteAll(oldTiles);
return r;
}
void QQuickContext2DTexture::clearTiles()
{
qDeleteAll(m_tiles);
m_tiles.clear();
}
QSize QQuickContext2DTexture::adjustedTileSize(const QSize &ts)
{
return ts;
}
bool QQuickContext2DTexture::event(QEvent *e)
{
if ((int) e->type() == QEvent::User + 1) {
PaintEvent *pe = static_cast<PaintEvent *>(e);
paint(pe->buffer);
return true;
} else if ((int) e->type() == QEvent::User + 2) {
CanvasChangeEvent *ce = static_cast<CanvasChangeEvent *>(e);
canvasChanged(ce->canvasSize, ce->tileSize, ce->canvasWindow, ce->dirtyRect, ce->smooth, ce->antialiasing);
return true;
}
return QObject::event(e);
}
#if QT_CONFIG(opengl)
static inline QSize npotAdjustedSize(const QSize &size)
{
static bool checked = false;
static bool npotSupported = false;
if (!checked) {
npotSupported = QOpenGLContext::currentContext()->functions()->hasOpenGLFeature(QOpenGLFunctions::NPOTTextures);
checked = true;
}
if (npotSupported) {
return QSize(qMax(QT_MINIMUM_FBO_SIZE, size.width()),
qMax(QT_MINIMUM_FBO_SIZE, size.height()));
}
return QSize(qMax(QT_MINIMUM_FBO_SIZE, qt_next_power_of_two(size.width())),
qMax(QT_MINIMUM_FBO_SIZE, qt_next_power_of_two(size.height())));
}
QQuickContext2DFBOTexture::QQuickContext2DFBOTexture()
: QQuickContext2DTexture()
, m_fbo(0)
, m_multisampledFbo(0)
, m_paint_device(0)
{
m_displayTextures[0] = 0;
m_displayTextures[1] = 0;
m_displayTexture = -1;
}
QQuickContext2DFBOTexture::~QQuickContext2DFBOTexture()
{
if (m_multisampledFbo)
m_multisampledFbo->release();
else if (m_fbo)
m_fbo->release();
delete m_fbo;
delete m_multisampledFbo;
delete m_paint_device;
if (QOpenGLContext::currentContext())
QOpenGLContext::currentContext()->functions()->glDeleteTextures(2, m_displayTextures);
}
QVector2D QQuickContext2DFBOTexture::scaleFactor() const
{
if (!m_fbo)
return QVector2D(1, 1);
return QVector2D(m_fbo->width() / m_fboSize.width(),
m_fbo->height() / m_fboSize.height());
}
QSGTexture *QQuickContext2DFBOTexture::textureForNextFrame(QSGTexture *lastTexture, QQuickWindow *)
{
QSGPlainTexture *texture = static_cast<QSGPlainTexture *>(lastTexture);
if (m_onCustomThread)
m_mutex.lock();
if (m_fbo) {
if (!texture) {
texture = new QSGPlainTexture();
texture->setHasAlphaChannel(true);
texture->setOwnsTexture(false);
m_dirtyTexture = true;
}
if (m_dirtyTexture) {
if (!m_gl) {
// on a rendering thread, use the fbo directly...
texture->setTextureId(m_fbo->texture());
} else {
// on GUI or custom thread, use display textures...
m_displayTexture = m_displayTexture == 0 ? 1 : 0;
texture->setTextureId(m_displayTextures[m_displayTexture]);
}
texture->setTextureSize(m_fbo->size());
m_dirtyTexture = false;
}
}
if (m_onCustomThread) {
m_condition.wakeOne();
m_mutex.unlock();
}
return texture;
}
QSize QQuickContext2DFBOTexture::adjustedTileSize(const QSize &ts)
{
return npotAdjustedSize(ts);
}
QRectF QQuickContext2DFBOTexture::normalizedTextureSubRect() const
{
return QRectF(0
, 0
, qreal(m_canvasWindow.width()) / m_fboSize.width()
, qreal(m_canvasWindow.height()) / m_fboSize.height());
}
QQuickContext2DTile* QQuickContext2DFBOTexture::createTile() const
{
return new QQuickContext2DFBOTile();
}
bool QQuickContext2DFBOTexture::doMultisampling() const
{
static bool extensionsChecked = false;
static bool multisamplingSupported = false;
if (!extensionsChecked) {
QOpenGLExtensions *e = static_cast<QOpenGLExtensions *>(QOpenGLContext::currentContext()->functions());
multisamplingSupported = e->hasOpenGLExtension(QOpenGLExtensions::FramebufferMultisample)
&& e->hasOpenGLExtension(QOpenGLExtensions::FramebufferBlit);
extensionsChecked = true;
}
return multisamplingSupported && m_antialiasing;
}
void QQuickContext2DFBOTexture::grabImage(const QRectF& rf)
{
Q_ASSERT(rf.isValid());
QQuickContext2D::mutex.lock();
if (m_context) {
if (!m_fbo) {
m_context->setGrabbedImage(QImage());
} else {
QImage grabbed;
GLAcquireContext ctx(m_gl, m_surface);
grabbed = m_fbo->toImage().scaled(m_fboSize, Qt::IgnoreAspectRatio, Qt::SmoothTransformation).mirrored().copy(rf.toRect());
m_context->setGrabbedImage(grabbed);
}
}
QQuickContext2D::mutex.unlock();
}
void QQuickContext2DFBOTexture::compositeTile(QQuickContext2DTile* tile)
{
QQuickContext2DFBOTile* t = static_cast<QQuickContext2DFBOTile*>(tile);
QRect target = t->rect().intersected(m_canvasWindow);
if (target.isValid()) {
QRect source = target;
source.moveTo(source.topLeft() - t->rect().topLeft());
target.moveTo(target.topLeft() - m_canvasWindow.topLeft());
QOpenGLFramebufferObject::blitFramebuffer(m_fbo, target, t->fbo(), source);
}
}
QQuickCanvasItem::RenderTarget QQuickContext2DFBOTexture::renderTarget() const
{
return QQuickCanvasItem::FramebufferObject;
}
QPaintDevice* QQuickContext2DFBOTexture::beginPainting()
{
QQuickContext2DTexture::beginPainting();
const qreal devicePixelRatio = (m_item && m_item->window()) ?
m_item->window()->effectiveDevicePixelRatio() : qApp->devicePixelRatio();
if (m_canvasWindow.size().isEmpty()) {
delete m_fbo;
delete m_multisampledFbo;
delete m_paint_device;
m_fbo = 0;
m_multisampledFbo = 0;
m_paint_device = 0;
return 0;
} else if (!m_fbo || m_canvasWindowChanged) {
delete m_fbo;
delete m_multisampledFbo;
delete m_paint_device;
m_paint_device = 0;
m_fboSize = npotAdjustedSize(m_canvasWindow.size() * devicePixelRatio);
m_canvasWindowChanged = false;
if (doMultisampling()) {
{
QOpenGLFramebufferObjectFormat format;
format.setAttachment(QOpenGLFramebufferObject::CombinedDepthStencil);
format.setSamples(8);
m_multisampledFbo = new QOpenGLFramebufferObject(m_fboSize, format);
}
{
QOpenGLFramebufferObjectFormat format;
format.setAttachment(QOpenGLFramebufferObject::NoAttachment);
m_fbo = new QOpenGLFramebufferObject(m_fboSize, format);
}
} else {
QOpenGLFramebufferObjectFormat format;
format.setAttachment(QOpenGLFramebufferObject::CombinedDepthStencil);
QSize s = m_fboSize;
if (m_antialiasing) { // do supersampling since multisampling is not available
GLint max;
QOpenGLContext::currentContext()->functions()->glGetIntegerv(GL_MAX_TEXTURE_SIZE, &max);
if (s.width() * 2 <= max && s.height() * 2 <= max)
s = s * 2;
}
m_fbo = new QOpenGLFramebufferObject(s, format);
}
}
if (doMultisampling())
m_multisampledFbo->bind();
else
m_fbo->bind();
if (!m_paint_device) {
QOpenGLPaintDevice *gl_device = new QOpenGLPaintDevice(m_fbo->size());
gl_device->setPaintFlipped(true);
gl_device->setSize(m_fbo->size());
gl_device->setDevicePixelRatio(devicePixelRatio);
m_paint_device = gl_device;
}
return m_paint_device;
}
void QQuickContext2DFBOTexture::endPainting()
{
QQuickContext2DTexture::endPainting();
// There may not be an FBO due to zero width or height.
if (!m_fbo)
return;
if (m_multisampledFbo)
QOpenGLFramebufferObject::blitFramebuffer(m_fbo, m_multisampledFbo);
if (m_gl) {
/* When rendering happens on the render thread, the fbo's texture is
* used directly for display. If we are on the GUI thread or a
* dedicated Canvas render thread, we need to decouple the FBO from
* the texture we are displaying in the SG rendering thread to avoid
* stalls and read/write issues in the GL pipeline as the FBO's texture
* could then potentially be used in different threads.
*
* We could have gotten away with only one display texture, but this
* would have implied that beginPainting would have to wait for SG
* to release that texture.
*/
if (m_onCustomThread)
m_mutex.lock();
QOpenGLFunctions *funcs = QOpenGLContext::currentContext()->functions();
if (m_displayTextures[0] == 0) {
m_displayTexture = 1;
funcs->glGenTextures(2, m_displayTextures);
}
m_fbo->bind();
GLuint target = m_displayTexture == 0 ? 1 : 0;
funcs->glBindTexture(GL_TEXTURE_2D, m_displayTextures[target]);
funcs->glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 0, 0, m_fbo->width(), m_fbo->height(), 0);
if (m_onCustomThread)
m_mutex.unlock();
}
m_fbo->bindDefault();
}
#endif
QQuickContext2DImageTexture::QQuickContext2DImageTexture()
: QQuickContext2DTexture()
{
}
QQuickContext2DImageTexture::~QQuickContext2DImageTexture()
{
}
QQuickCanvasItem::RenderTarget QQuickContext2DImageTexture::renderTarget() const
{
return QQuickCanvasItem::Image;
}
QQuickContext2DTile* QQuickContext2DImageTexture::createTile() const
{
return new QQuickContext2DImageTile();
}
void QQuickContext2DImageTexture::grabImage(const QRectF& rf)
{
Q_ASSERT(rf.isValid());
QQuickContext2D::mutex.lock();
if (m_context) {
QImage grabbed = m_displayImage.copy(rf.toRect());
m_context->setGrabbedImage(grabbed);
}
QQuickContext2D::mutex.unlock();
}
QSGTexture *QQuickContext2DImageTexture::textureForNextFrame(QSGTexture *last, QQuickWindow *window)
{
if (m_onCustomThread)
m_mutex.lock();
delete last;
QSGTexture *texture = window->createTextureFromImage(m_displayImage, QQuickWindow::TextureCanUseAtlas);
m_dirtyTexture = false;
if (m_onCustomThread)
m_mutex.unlock();
return texture;
}
QPaintDevice* QQuickContext2DImageTexture::beginPainting()
{
QQuickContext2DTexture::beginPainting();
if (m_canvasWindow.size().isEmpty())
return 0;
const qreal devicePixelRatio = (m_item && m_item->window()) ?
m_item->window()->effectiveDevicePixelRatio() : qApp->devicePixelRatio();
if (m_canvasWindowChanged) {
m_image = QImage(m_canvasWindow.size() * devicePixelRatio, QImage::Format_ARGB32_Premultiplied);
m_image.setDevicePixelRatio(devicePixelRatio);
m_image.fill(0x00000000);
m_canvasWindowChanged = false;
}
return &m_image;
}
void QQuickContext2DImageTexture::endPainting()
{
QQuickContext2DTexture::endPainting();
if (m_onCustomThread)
m_mutex.lock();
m_displayImage = m_image;
if (m_onCustomThread)
m_mutex.unlock();
}
void QQuickContext2DImageTexture::compositeTile(QQuickContext2DTile* tile)
{
Q_ASSERT(!tile->dirty());
QQuickContext2DImageTile* t = static_cast<QQuickContext2DImageTile*>(tile);
QRect target = t->rect().intersected(m_canvasWindow);
if (target.isValid()) {
QRect source = target;
source.moveTo(source.topLeft() - t->rect().topLeft());
target.moveTo(target.topLeft() - m_canvasWindow.topLeft());
m_painter.begin(&m_image);
m_painter.setCompositionMode(QPainter::CompositionMode_Source);
m_painter.drawImage(target, t->image(), source);
m_painter.end();
}
}
QT_END_NAMESPACE
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