diff options
Diffstat (limited to 'src/platformsupport/eglconvenience/qeglplatformbackingstore.cpp')
| -rw-r--r-- | src/platformsupport/eglconvenience/qeglplatformbackingstore.cpp | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/src/platformsupport/eglconvenience/qeglplatformbackingstore.cpp b/src/platformsupport/eglconvenience/qeglplatformbackingstore.cpp new file mode 100644 index 0000000000..6a22c01a83 --- /dev/null +++ b/src/platformsupport/eglconvenience/qeglplatformbackingstore.cpp @@ -0,0 +1,186 @@ +/**************************************************************************** +** +** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the plugins 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 Digia. For licensing terms and +** conditions see http://qt.digia.com/licensing. For further information +** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Digia gives you certain additional +** rights. These rights are described in the Digia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <QtGui/QOpenGLShaderProgram> +#include <QtGui/QOpenGLContext> + +#include "qeglplatformbackingstore_p.h" +#include "qeglcompositor_p.h" +#include "qeglplatformwindow_p.h" +#include "qeglplatformscreen_p.h" + +QT_BEGIN_NAMESPACE + +/*! + \class QEGLPlatformBackingStore + \brief A backing store implementation for EGL and GLES. + \since 5.2 + \internal + \ingroup qpa + + This implementation uploads raster-rendered widget windows into + textures and composites them onto a single native window using + QEGLCompositor. This means that multiple top-level widgets are + supported without creating actual native windows for each of them. + + The class is ready to be used as-is, the default + QEGLPlatformIntegration::createPlatformBackingStore() + implementation creates an instance which is ready to be used + without further customization. + + If QEGLCompositor is not suitable, this backing store + implementation can also be used without it. In this case a + subclass must reimplement composite() and schedule an update in + its custom compositor when this function is called. The textures + are accessible via QEGLPlatformWindow::texture(). +*/ + +QEGLPlatformBackingStore::QEGLPlatformBackingStore(QWindow *window) + : QPlatformBackingStore(window), + m_window(static_cast<QEGLPlatformWindow *>(window->handle())), + m_texture(0) +{ + m_window->setBackingStore(this); +} + +QPaintDevice *QEGLPlatformBackingStore::paintDevice() +{ + return &m_image; +} + +void QEGLPlatformBackingStore::updateTexture() +{ + glBindTexture(GL_TEXTURE_2D, m_texture); + + if (!m_dirty.isNull()) { + QRegion fixed; + QRect imageRect = m_image.rect(); + + foreach (const QRect &rect, m_dirty.rects()) { + // intersect with image rect to be sure + QRect r = imageRect & rect; + + // if the rect is wide enough it's cheaper to just + // extend it instead of doing an image copy + if (r.width() >= imageRect.width() / 2) { + r.setX(0); + r.setWidth(imageRect.width()); + } + + fixed |= r; + } + + foreach (const QRect &rect, fixed.rects()) { + // if the sub-rect is full-width we can pass the image data directly to + // OpenGL instead of copying, since there's no gap between scanlines + if (rect.width() == imageRect.width()) { + glTexSubImage2D(GL_TEXTURE_2D, 0, 0, rect.y(), rect.width(), rect.height(), GL_RGBA, GL_UNSIGNED_BYTE, + m_image.constScanLine(rect.y())); + } else { + glTexSubImage2D(GL_TEXTURE_2D, 0, rect.x(), rect.y(), rect.width(), rect.height(), GL_RGBA, GL_UNSIGNED_BYTE, + m_image.copy(rect).constBits()); + } + } + + m_dirty = QRegion(); + } +} + +void QEGLPlatformBackingStore::flush(QWindow *window, const QRegion ®ion, const QPoint &offset) +{ + Q_UNUSED(window); + Q_UNUSED(region); + Q_UNUSED(offset); + +#ifdef QEGL_EXTRA_DEBUG + qWarning("QEglBackingStore::flush %p", window); +#endif + + QEGLPlatformScreen *screen = static_cast<QEGLPlatformScreen *>(m_window->screen()); + QEGLPlatformWindow *dstWin = screen->compositingWindow(); + if (!dstWin || !dstWin->isRaster()) + return; + + m_window->create(); + QOpenGLContext *context = screen->compositingContext(); + context->makeCurrent(dstWin->window()); + updateTexture(); + composite(context, dstWin); +} + +void QEGLPlatformBackingStore::composite(QOpenGLContext *context, QEGLPlatformWindow *window) +{ + QEGLCompositor::instance()->schedule(context, window); +} + +void QEGLPlatformBackingStore::beginPaint(const QRegion &rgn) +{ + m_dirty |= rgn; +} + +void QEGLPlatformBackingStore::resize(const QSize &size, const QRegion &staticContents) +{ + Q_UNUSED(staticContents); + + QEGLPlatformScreen *screen = static_cast<QEGLPlatformScreen *>(m_window->screen()); + QEGLPlatformWindow *dstWin = screen->compositingWindow(); + if (!dstWin || !dstWin->isRaster()) + return; + + m_image = QImage(size, QImage::Format_RGB32); + m_window->create(); + + screen->compositingContext()->makeCurrent(dstWin->window()); + + if (m_texture) + glDeleteTextures(1, &m_texture); + + glGenTextures(1, &m_texture); + glBindTexture(GL_TEXTURE_2D, m_texture); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); + + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, size.width(), size.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, 0); +} + +QT_END_NAMESPACE |