daniel/QTeletextMaker
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Implement exporting PNG images

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This commit is contained in:
G.K.MacGregor
2021-06-03 22:26:54 +01:00
parent 23c2623bcf
commit c8e57150eb
5 changed files with 90 additions and 1 deletions
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57
mainwindow.cpp
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@@ -20,9 +20,11 @@
#include <QApplication>
#include <QDesktopServices>
#include <QFileDialog>
#include <QImage>
#include <QList>
#include <QMenuBar>
#include <QMessageBox>
#include <QPainter>
#include <QPushButton>
#include <QRadioButton>
#include <QSaveFile>
@@ -120,6 +122,56 @@ bool MainWindow::saveAs()
return saveFile(fileName);
}
void MainWindow::exportPNG()
{
QString exportFileName = QFileDialog::getSaveFileName(this, tr("Export PNG"), QString(), "PNG image (*.png)");
if (exportFileName.isEmpty())
return;
// Prepare widget image for extraction
m_textWidget->pauseFlash(true);
m_textScene->hideGUIElements(true);
bool reshowCodes = m_textWidget->pageRender()->showCodes();
if (reshowCodes)
m_textWidget->pageRender()->setShowCodes(false);
// Disable exporting in Mix mode as it corrupts the background
bool reMix = m_textWidget->pageRender()->mix();
if (reMix)
m_textWidget->pageRender()->setMix(false);
// Extract the image from the scene
QImage interImage = QImage(m_textScene->sceneRect().size().toSize(), QImage::Format_RGB32);
// This ought to make the background transparent in Mix mode, but it doesn't
// if (m_textWidget->pageRender()->mix())
// interImage.fill(QColor(0, 0, 0, 0));
QPainter interPainter(&interImage);
m_textScene->render(&interPainter);
// Now we're extracted the image we can put the GUI things back
m_textScene->hideGUIElements(false);
if (reshowCodes)
m_textWidget->pageRender()->setShowCodes(true);
if (reMix)
m_textWidget->pageRender()->setMix(true);
m_textWidget->pauseFlash(false);
// Now scale the extracted image to the selected aspect ratio
// We do this in two steps so that anti-aliasing only occurs on vertical lines
// Double the vertical height first
const QImage doubleHeightImage = interImage.scaled(interImage.width(), interImage.height()*2, Qt::IgnoreAspectRatio, Qt::FastTransformation);
// If aspect ratio is Pixel 1:2 we're already at the correct scale
if (m_viewAspectRatio != 3) {
// Scale it horizontally to the selected aspect ratio
const QImage scaledImage = doubleHeightImage.scaled((int)((float)doubleHeightImage.width() * aspectRatioHorizontalScaling[m_viewAspectRatio] * 2), doubleHeightImage.height(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
if (!scaledImage.save(exportFileName, "PNG"))
QMessageBox::warning(this, tr("QTeletextMaker"), tr("Cannot export file %1.").arg(QDir::toNativeSeparators(exportFileName)));
} else if (!doubleHeightImage.save(exportFileName, "PNG"))
QMessageBox::warning(this, tr("QTeletextMaker"), tr("Cannot export file %1.").arg(QDir::toNativeSeparators(exportFileName)));
}
void MainWindow::exportZXNet()
{
QDesktopServices::openUrl(QUrl("http://zxnet.co.uk/teletext/editor/" + exportHashStringPage(m_textWidget->document()->currentSubPage()) + exportHashStringPackets(m_textWidget->document()->currentSubPage())));
@@ -257,6 +309,10 @@ void MainWindow::createActions()
setRecentFilesVisible(MainWindow::hasRecentFiles());
QAction *exportPNGAct = fileMenu->addAction(tr("Export subpage as PNG..."));
exportPNGAct->setStatusTip("Export a PNG image of this subpage");
connect(exportPNGAct, &QAction::triggered, this, &MainWindow::exportPNG);
QMenu *exportHashStringSubMenu = fileMenu->addMenu(tr("Export subpage to online editor"));
QAction *exportZXNetAct = exportHashStringSubMenu->addAction(tr("Open in zxnet.co.uk"));
@@ -555,7 +611,6 @@ void MainWindow::createActions()
void MainWindow::setSceneDimensions()
{
const float aspectRatioHorizontalScaling[4] = { 0.6, 0.6, 0.8, 0.5 };
const int topBottomBorders[3] = { 0, 10, 19 };
const int pillarBoxSizes[3] = { 672, 720, 854 };
const int leftRightBorders[3] = { 0, 24, 77 };