qt-everywhere-src-5.14.1/qtbase/src/plugins/platforms/qnx/qqnxrasterwindow.cpp - orbit - Git at Google

 /***************************************************************************
 **
 ** Copyright (C) 2013 - 2014 BlackBerry Limited. All rights reserved.
 ** Contact: https://www.qt.io/licensing/
 **
 ** 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 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 "qqnxglobal.h"

 #include "qqnxrasterwindow.h"
 #include "qqnxscreen.h"

 #include <QDebug>

 #include <errno.h>

 #if defined(QQNXRASTERWINDOW_DEBUG)
 #define qRasterWindowDebug qDebug
 #else
 #define qRasterWindowDebug QT_NO_QDEBUG_MACRO
 #endif

 QT_BEGIN_NAMESPACE

 QQnxRasterWindow::QQnxRasterWindow(QWindow *window, screen_context_t context, bool needRootWindow) :
     QQnxWindow(window, context, needRootWindow),
     m_currentBufferIndex(-1),
     m_previousBufferIndex(-1)
 {
     initWindow();

     // Set window usage
     if (window->type() == Qt::Desktop)
         return;

     const int val = SCREEN_USAGE_NATIVE | SCREEN_USAGE_READ | SCREEN_USAGE_WRITE;
     const int result = screen_set_window_property_iv(nativeHandle(), SCREEN_PROPERTY_USAGE, &val);
     if (Q_UNLIKELY(result != 0))
         qFatal("QQnxRasterWindow: failed to set window alpha usage, errno=%d", errno);
 }

 void QQnxRasterWindow::post(const QRegion &dirty)
 {
     // How double-buffering works
     // --------------------------
     //
     // The are two buffers, the previous one and the current one.
     // The previous buffer always contains the complete, full image of the whole window when it
     // was last posted.
     // The current buffer starts with the complete, full image of the second to last posting
     // of the window.
     //
     // During painting, Qt paints on the current buffer. Thus, when Qt has finished painting, the
     // current buffer contains the second to last image plus the newly painted regions.
     // Since the second to last image is too old, we copy over the image from the previous buffer, but
     // only for those regions that Qt didn't paint (because that would overwrite what Qt has just
     // painted). This is the copyPreviousToCurrent() call below.
     //
     // After the call to copyPreviousToCurrent(), the current buffer contains the complete, full image of the
     // whole window in its current state, and we call screen_post_window() to make the new buffer
     // available to libscreen (called "posting"). There, only the regions that Qt painted on are
     // posted, as nothing else has changed.
     //
     // After that, the previous and the current buffers are swapped, and the whole cycle starts anew.

     // Check if render buffer exists and something was rendered
     if (m_currentBufferIndex != -1 && !dirty.isEmpty()) {
         qRasterWindowDebug() << "window =" << window();
         QQnxBuffer &currentBuffer = m_buffers[m_currentBufferIndex];

         // Copy unmodified region from old render buffer to new render buffer;
         // required to allow partial updates
         QRegion preserve = m_previousDirty - dirty - m_scrolled;
         blitPreviousToCurrent(preserve, 0, 0);

         // Calculate region that changed
         QRegion modified = preserve + dirty + m_scrolled;
         QRect rect = modified.boundingRect();
         int dirtyRect[4] = { rect.x(), rect.y(), rect.x() + rect.width(), rect.y() + rect.height() };

         // Update the display with contents of render buffer
         Q_SCREEN_CHECKERROR(
                 screen_post_window(nativeHandle(), currentBuffer.nativeBuffer(), 1, dirtyRect, 0),
                 "Failed to post window");

         // Advance to next nender buffer
         m_previousBufferIndex = m_currentBufferIndex++;
         if (m_currentBufferIndex >= MAX_BUFFER_COUNT)
             m_currentBufferIndex = 0;

         // Save modified region and clear scrolled region
         m_previousDirty = dirty;
         m_scrolled = QRegion();

         windowPosted();
     }
 }

 void QQnxRasterWindow::scroll(const QRegion &region, int dx, int dy, bool flush)
 {
     qRasterWindowDebug() << "window =" << window();
     blitPreviousToCurrent(region, dx, dy, flush);
     m_scrolled += region;
 }

 QQnxBuffer &QQnxRasterWindow::renderBuffer()
 {
     qRasterWindowDebug() << "window =" << window();

     // Check if render buffer is invalid
     if (m_currentBufferIndex == -1) {
         auto platformScreen = static_cast<QQnxScreen *>(screen());
         // Get all buffers available for rendering
         screen_buffer_t buffers[MAX_BUFFER_COUNT];
         const int result = screen_get_window_property_pv(nativeHandle(), SCREEN_PROPERTY_RENDER_BUFFERS,
                                                    (void **)buffers);
         Q_SCREEN_CRITICALERROR(result, "Failed to query window buffers");

         // Wrap each buffer and clear
         for (int i = 0; i < MAX_BUFFER_COUNT; ++i) {
             m_buffers[i] = QQnxBuffer(buffers[i]);

             // Clear Buffer
             int bg[] = { SCREEN_BLIT_COLOR, 0x00000000, SCREEN_BLIT_END };
             Q_SCREEN_CHECKERROR(screen_fill(platformScreen->nativeContext(), buffers[i], bg),
                                 "Failed to clear window buffer");
         }

         Q_SCREEN_CHECKERROR(screen_flush_blits(platformScreen->nativeContext(), SCREEN_WAIT_IDLE),
                             "Failed to flush blits");

         // Use the first available render buffer
         m_currentBufferIndex = 0;
         m_previousBufferIndex = -1;
     }

     return m_buffers[m_currentBufferIndex];
 }

 void QQnxRasterWindow::setParent(const QPlatformWindow *wnd)
 {
     QQnxWindow::setParent(wnd);
     adjustBufferSize();
 }

 void QQnxRasterWindow::adjustBufferSize()
 {
     // When having a raster window we don't need any buffers, since
     // Qt will draw to the parent TLW backing store.
     const QSize windowSize = window()->parent() ? QSize(0,0) : window()->size();
     if (windowSize != bufferSize())
         setBufferSize(windowSize);
 }

 int QQnxRasterWindow::pixelFormat() const
 {
     return static_cast<QQnxScreen *>(screen())->nativeFormat();
 }

 void QQnxRasterWindow::resetBuffers()
 {
     // Buffers were destroyed; reacquire them
     m_currentBufferIndex = -1;
     m_previousDirty = QRegion();
     m_scrolled = QRegion();
     if (window()->parent() && bufferSize() == QSize(1,1)) {
         // If we have a parent then we're not really rendering.  But if we don't render we'll
         // be invisible and any children won't show up.  This should be harmless since we're
         // rendering into a 1x1 window that has transparency set to discard.
         renderBuffer();
         post(QRegion(0,0,1,1));
     }
 }

 void QQnxRasterWindow::blitPreviousToCurrent(const QRegion &region, int dx, int dy, bool flush)
 {
     qRasterWindowDebug() << "window =" << window();

     // Abort if previous buffer is invalid or if nothing to copy
     if (m_previousBufferIndex == -1 || region.isEmpty())
         return;

     QQnxBuffer &currentBuffer = m_buffers[m_currentBufferIndex];
     QQnxBuffer &previousBuffer = m_buffers[m_previousBufferIndex];

     // Break down region into non-overlapping rectangles
     for (auto rit = region.rbegin(), rend = region.rend(); rit != rend; ++rit) {
         // Clip rectangle to bounds of target
         const QRect rect = rit->intersected(currentBuffer.rect());

         if (rect.isEmpty())
             continue;

         // Setup blit operation
         int attribs[] = { SCREEN_BLIT_SOURCE_X, rect.x(),
                           SCREEN_BLIT_SOURCE_Y, rect.y(),
                           SCREEN_BLIT_SOURCE_WIDTH, rect.width(),
                           SCREEN_BLIT_SOURCE_HEIGHT, rect.height(),
                           SCREEN_BLIT_DESTINATION_X, rect.x() + dx,
                           SCREEN_BLIT_DESTINATION_Y, rect.y() + dy,
                           SCREEN_BLIT_DESTINATION_WIDTH, rect.width(),
                           SCREEN_BLIT_DESTINATION_HEIGHT, rect.height(),
                           SCREEN_BLIT_END };

         // Queue blit operation
         Q_SCREEN_CHECKERROR(screen_blit(m_screenContext, currentBuffer.nativeBuffer(),
                                        previousBuffer.nativeBuffer(), attribs),
                             "Failed to blit buffers");
     }

     // Check if flush requested
     if (flush) {
         // Wait for all blits to complete
         Q_SCREEN_CHECKERROR(screen_flush_blits(m_screenContext, SCREEN_WAIT_IDLE),
                             "Failed to flush blits");

         // Buffer was modified outside the CPU
         currentBuffer.invalidateInCache();
     }
 }

 QT_END_NAMESPACE
	/***************************************************************************
	**
	** Copyright (C) 2013 - 2014 BlackBerry Limited. All rights reserved.
	** Contact: https://www.qt.io/licensing/
	**
	** 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 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 "qqnxglobal.h"

	#include "qqnxrasterwindow.h"
	#include "qqnxscreen.h"

	#include <QDebug>

	#include <errno.h>

	#if defined(QQNXRASTERWINDOW_DEBUG)
	#define qRasterWindowDebug qDebug
	#else
	#define qRasterWindowDebug QT_NO_QDEBUG_MACRO
	#endif

	QT_BEGIN_NAMESPACE

	QQnxRasterWindow::QQnxRasterWindow(QWindow *window, screen_context_t context, bool needRootWindow) :
	QQnxWindow(window, context, needRootWindow),
	m_currentBufferIndex(-1),
	m_previousBufferIndex(-1)
	{
	initWindow();

	// Set window usage
	if (window->type() == Qt::Desktop)
	return;

	const int val = SCREEN_USAGE_NATIVE \| SCREEN_USAGE_READ \| SCREEN_USAGE_WRITE;
	const int result = screen_set_window_property_iv(nativeHandle(), SCREEN_PROPERTY_USAGE, &val);
	if (Q_UNLIKELY(result != 0))
	qFatal("QQnxRasterWindow: failed to set window alpha usage, errno=%d", errno);
	}

	void QQnxRasterWindow::post(const QRegion &dirty)
	{
	// How double-buffering works
	// --------------------------
	//
	// The are two buffers, the previous one and the current one.
	// The previous buffer always contains the complete, full image of the whole window when it
	// was last posted.
	// The current buffer starts with the complete, full image of the second to last posting
	// of the window.
	//
	// During painting, Qt paints on the current buffer. Thus, when Qt has finished painting, the
	// current buffer contains the second to last image plus the newly painted regions.
	// Since the second to last image is too old, we copy over the image from the previous buffer, but
	// only for those regions that Qt didn't paint (because that would overwrite what Qt has just
	// painted). This is the copyPreviousToCurrent() call below.
	//
	// After the call to copyPreviousToCurrent(), the current buffer contains the complete, full image of the
	// whole window in its current state, and we call screen_post_window() to make the new buffer
	// available to libscreen (called "posting"). There, only the regions that Qt painted on are
	// posted, as nothing else has changed.
	//
	// After that, the previous and the current buffers are swapped, and the whole cycle starts anew.

	// Check if render buffer exists and something was rendered
	if (m_currentBufferIndex != -1 && !dirty.isEmpty()) {
	qRasterWindowDebug() << "window =" << window();
	QQnxBuffer &currentBuffer = m_buffers[m_currentBufferIndex];

	// Copy unmodified region from old render buffer to new render buffer;
	// required to allow partial updates
	QRegion preserve = m_previousDirty - dirty - m_scrolled;
	blitPreviousToCurrent(preserve, 0, 0);

	// Calculate region that changed
	QRegion modified = preserve + dirty + m_scrolled;
	QRect rect = modified.boundingRect();
	int dirtyRect[4] = { rect.x(), rect.y(), rect.x() + rect.width(), rect.y() + rect.height() };

	// Update the display with contents of render buffer
	Q_SCREEN_CHECKERROR(
	screen_post_window(nativeHandle(), currentBuffer.nativeBuffer(), 1, dirtyRect, 0),
	"Failed to post window");

	// Advance to next nender buffer
	m_previousBufferIndex = m_currentBufferIndex++;
	if (m_currentBufferIndex >= MAX_BUFFER_COUNT)
	m_currentBufferIndex = 0;

	// Save modified region and clear scrolled region
	m_previousDirty = dirty;
	m_scrolled = QRegion();

	windowPosted();
	}
	}

	void QQnxRasterWindow::scroll(const QRegion &region, int dx, int dy, bool flush)
	{
	qRasterWindowDebug() << "window =" << window();
	blitPreviousToCurrent(region, dx, dy, flush);
	m_scrolled += region;
	}

	QQnxBuffer &QQnxRasterWindow::renderBuffer()
	{
	qRasterWindowDebug() << "window =" << window();

	// Check if render buffer is invalid
	if (m_currentBufferIndex == -1) {
	auto platformScreen = static_cast<QQnxScreen *>(screen());
	// Get all buffers available for rendering
	screen_buffer_t buffers[MAX_BUFFER_COUNT];
	const int result = screen_get_window_property_pv(nativeHandle(), SCREEN_PROPERTY_RENDER_BUFFERS,
	(void **)buffers);
	Q_SCREEN_CRITICALERROR(result, "Failed to query window buffers");

	// Wrap each buffer and clear
	for (int i = 0; i < MAX_BUFFER_COUNT; ++i) {
	m_buffers[i] = QQnxBuffer(buffers[i]);

	// Clear Buffer
	int bg[] = { SCREEN_BLIT_COLOR, 0x00000000, SCREEN_BLIT_END };
	Q_SCREEN_CHECKERROR(screen_fill(platformScreen->nativeContext(), buffers[i], bg),
	"Failed to clear window buffer");
	}

	Q_SCREEN_CHECKERROR(screen_flush_blits(platformScreen->nativeContext(), SCREEN_WAIT_IDLE),
	"Failed to flush blits");

	// Use the first available render buffer
	m_currentBufferIndex = 0;
	m_previousBufferIndex = -1;
	}

	return m_buffers[m_currentBufferIndex];
	}

	void QQnxRasterWindow::setParent(const QPlatformWindow *wnd)
	{
	QQnxWindow::setParent(wnd);
	adjustBufferSize();
	}

	void QQnxRasterWindow::adjustBufferSize()
	{
	// When having a raster window we don't need any buffers, since
	// Qt will draw to the parent TLW backing store.
	const QSize windowSize = window()->parent() ? QSize(0,0) : window()->size();
	if (windowSize != bufferSize())
	setBufferSize(windowSize);
	}

	int QQnxRasterWindow::pixelFormat() const
	{
	return static_cast<QQnxScreen *>(screen())->nativeFormat();
	}

	void QQnxRasterWindow::resetBuffers()
	{
	// Buffers were destroyed; reacquire them
	m_currentBufferIndex = -1;
	m_previousDirty = QRegion();
	m_scrolled = QRegion();
	if (window()->parent() && bufferSize() == QSize(1,1)) {
	// If we have a parent then we're not really rendering. But if we don't render we'll
	// be invisible and any children won't show up. This should be harmless since we're
	// rendering into a 1x1 window that has transparency set to discard.
	renderBuffer();
	post(QRegion(0,0,1,1));
	}
	}

	void QQnxRasterWindow::blitPreviousToCurrent(const QRegion &region, int dx, int dy, bool flush)
	{
	qRasterWindowDebug() << "window =" << window();

	// Abort if previous buffer is invalid or if nothing to copy
	if (m_previousBufferIndex == -1 \|\| region.isEmpty())
	return;

	QQnxBuffer &currentBuffer = m_buffers[m_currentBufferIndex];
	QQnxBuffer &previousBuffer = m_buffers[m_previousBufferIndex];

	// Break down region into non-overlapping rectangles
	for (auto rit = region.rbegin(), rend = region.rend(); rit != rend; ++rit) {
	// Clip rectangle to bounds of target
	const QRect rect = rit->intersected(currentBuffer.rect());

	if (rect.isEmpty())
	continue;

	// Setup blit operation
	int attribs[] = { SCREEN_BLIT_SOURCE_X, rect.x(),
	SCREEN_BLIT_SOURCE_Y, rect.y(),
	SCREEN_BLIT_SOURCE_WIDTH, rect.width(),
	SCREEN_BLIT_SOURCE_HEIGHT, rect.height(),
	SCREEN_BLIT_DESTINATION_X, rect.x() + dx,
	SCREEN_BLIT_DESTINATION_Y, rect.y() + dy,
	SCREEN_BLIT_DESTINATION_WIDTH, rect.width(),
	SCREEN_BLIT_DESTINATION_HEIGHT, rect.height(),
	SCREEN_BLIT_END };

	// Queue blit operation
	Q_SCREEN_CHECKERROR(screen_blit(m_screenContext, currentBuffer.nativeBuffer(),
	previousBuffer.nativeBuffer(), attribs),
	"Failed to blit buffers");
	}

	// Check if flush requested
	if (flush) {
	// Wait for all blits to complete
	Q_SCREEN_CHECKERROR(screen_flush_blits(m_screenContext, SCREEN_WAIT_IDLE),
	"Failed to flush blits");

	// Buffer was modified outside the CPU
	currentBuffer.invalidateInCache();
	}
	}

	QT_END_NAMESPACE