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// Copyright (C) 2024 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "graphprinter.h"
#include <QtGui/qtguiglobal.h>
#include <QtGui/qtransform.h>
#include <QtPrintSupport/QtPrintSupport>
#if QT_CONFIG(opengl)
#include <QtGui/qoffscreensurface.h>
#endif
#include <rhi/qrhi.h>
GraphPrinter::GraphPrinter(QObject *parent)
: QObject(parent)
{}
GraphPrinter::~GraphPrinter() {}
static qreal s_maxTextureSize = 0.;
qreal GraphPrinter::maxTextureSize()
{
// Query maximum texture size only once
if (!s_maxTextureSize) {
std::unique_ptr<QRhi> rhi;
#if defined(Q_OS_WIN)
QRhiD3D12InitParams params;
rhi.reset(QRhi::create(QRhi::D3D12, ¶ms));
#elif defined(Q_OS_MACOS) || defined(Q_OS_IOS)
QRhiMetalInitParams params;
rhi.reset(QRhi::create(QRhi::Metal, ¶ms));
#elif QT_CONFIG(opengl)
QRhiGles2InitParams params;
params.fallbackSurface = QRhiGles2InitParams::newFallbackSurface();
rhi.reset(QRhi::create(QRhi::OpenGLES2, ¶ms));
#elif QT_CONFIG(vulkan)
if (!qEnvironmentVariable("QSG_RHI_BACKEND").compare("vulkan")) {
QVulkanInstance inst;
inst.setExtensions(QRhiVulkanInitParams::preferredInstanceExtensions());
if (inst.create()) {
QRhiVulkanInitParams params;
params.inst = &inst;
rhi.reset(QRhi::create(QRhi::Vulkan, ¶ms));
} else {
qWarning("Failed to create Vulkan instance");
}
}
#endif
if (rhi)
s_maxTextureSize = qreal(rhi->resourceLimit(QRhi::TextureSizeMax));
else
s_maxTextureSize = 4096.; // Use 4096 as the minimum
}
return s_maxTextureSize;
}
QString GraphPrinter::generatePDF(const QUrl &path, const QImage &image)
{
//! [0]
const QFile file = QFile(path.toLocalFile() + QStringLiteral("/graph.pdf"));
QPdfWriter writer(file.fileName());
writer.setResolution(90);
writer.setTitle("Graph");
writer.setPageSize(QPageSize(image.size()));
writer.setPageMargins(QMarginsF(0, 0, 0, 0));
writer.newPage();
//! [0]
//! [1]
QPainter painter(&writer);
const QImage finalImage = image.scaled(painter.viewport().size(), Qt::KeepAspectRatio);
painter.setRenderHint(QPainter::LosslessImageRendering);
painter.drawImage(finalImage.rect(), finalImage);
//! [1]
return file.fileName();
}
//! [2]
QString GraphPrinter::print(const QImage &image, const QString printerName)
{
QPrinterInfo printInfo = QPrinterInfo::printerInfo(printerName);
if (printInfo.isNull())
return QLatin1String("%1 is not a valid printer").arg(printerName);
QPrinter printer(printInfo, QPrinter::HighResolution);
printer.setOutputFormat(QPrinter::NativeFormat);
QPainter painter(&printer);
const QImage finalImage = image.scaled(painter.viewport().size(), Qt::KeepAspectRatio);
painter.setRenderHint(QPainter::LosslessImageRendering);
painter.drawImage(finalImage.rect(), finalImage);
return QLatin1String("Printed to %1").arg(printerName);
}
//! [2]
//! [3]
QStringList GraphPrinter::getPrinters()
{
return QPrinterInfo::availablePrinterNames();
}
//! [3]
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