daniel/QTeletextMaker
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Add export to animated GIF, wrt GH-9

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This commit is contained in:
Gavin MacGregor
2025-01-08 23:23:14 +00:00
parent e2f794c658
commit cdfcdd8754
24 changed files with 5021 additions and 34 deletions
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137
src/qteletextmaker/mainwindow.cpp
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@@ -50,6 +50,8 @@
#include "palettedockwidget.h"
#include "x26dockwidget.h"
#include "gifimage/qgifimage.h"
MainWindow::MainWindow()
{
init();
@@ -179,49 +181,132 @@ void MainWindow::reload()
m_textWidget->document()->selectSubPageIndex(subPageIndex, true);
}
void MainWindow::exportPNG()
void MainWindow::exportImage()
{
QString exportFileName = QFileDialog::getSaveFileName(this, tr("Export PNG"), QString(), "PNG image (*.png)");
QString exportFileName, selectedFilter, gifFilter;
if (!m_exportImageFileName.isEmpty())
exportFileName = m_exportImageFileName;
else {
// Image not exported before: suggest a filename with image extension
// If page has flashing, suggest GIF
exportFileName = m_curFile;
if (m_textWidget->flashTiming() != 0)
changeSuffixFromTTI(exportFileName, "gif");
else
changeSuffixFromTTI(exportFileName, "png");
}
if (m_textWidget->flashTiming() != 0)
gifFilter = "Animated GIF image (*.gif)";
else
gifFilter = "GIF image (*.gif)";
// Set the filter in the file dialog to the same as the current filename extension
if (QFileInfo(exportFileName).suffix().toLower() == "gif")
selectedFilter = gifFilter;
else
selectedFilter = "PNG image (*.png)";
exportFileName = QFileDialog::getSaveFileName(this, tr("Export image"), exportFileName, "PNG image (*.png);;" + gifFilter, &selectedFilter);
if (exportFileName.isEmpty())
return;
const QString suffix = QFileInfo(exportFileName).suffix().toLower();
if (suffix.isEmpty()) {
QMessageBox::warning(this, QApplication::applicationDisplayName(), tr("No filename extension specified."));
return;
} else if (suffix != "png" && suffix != "gif") {
QMessageBox::warning(this, QApplication::applicationDisplayName(), tr("Cannot export image of format %1.").arg(suffix));
return;
}
// Disable flash exporting if extension is not GIF
const int flashTiming = suffix == "gif" ? m_textWidget->flashTiming() : 0;
// Prepare widget image for extraction
m_textWidget->pauseFlash(true);
m_textScene->hideGUIElements(true);
// Disable exporting in Mix mode as it corrupts the background
bool reMix = m_textWidget->pageRender()->renderMode() == TeletextPageRender::RenderMix;
if (reMix)
m_textScene->setRenderMode(TeletextPageRender::RenderNormal);
// 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->pageDecode()->mix())
// interImage.fill(QColor(0, 0, 0, 0));
QPainter interPainter(&interImage);
m_textScene->render(&interPainter);
// Allocate initial image, with additional images for flashing if necessary
QImage interImage[6];
interImage[0] = QImage(m_textScene->sceneRect().size().toSize(), QImage::Format_RGB32);
if (flashTiming != 0) {
interImage[3] = QImage(m_textScene->sceneRect().size().toSize(), QImage::Format_RGB32);
if (flashTiming == 2) {
interImage[1] = QImage(m_textScene->sceneRect().size().toSize(), QImage::Format_RGB32);
interImage[2] = QImage(m_textScene->sceneRect().size().toSize(), QImage::Format_RGB32);
interImage[4] = QImage(m_textScene->sceneRect().size().toSize(), QImage::Format_RGB32);
interImage[5] = QImage(m_textScene->sceneRect().size().toSize(), QImage::Format_RGB32);
}
}
// Now extract the image(s) from the scene
for (int p=0; p<6; p++)
if (!interImage[p].isNull()) {
m_textWidget->pauseFlash(p);
// This ought to make the background transparent in Mix mode, but it doesn't
// if (m_textWidget->pageDecode()->mix())
// interImage.fill(QColor(0, 0, 0, 0));
QPainter interPainter(&interImage[p]);
m_textScene->render(&interPainter);
}
// Now we've extracted the image we can put the GUI things back
m_textScene->hideGUIElements(false);
if (reMix)
m_textScene->setRenderMode(TeletextPageRender::RenderMix);
m_textWidget->pauseFlash(false);
m_textWidget->resumeFlash();
// 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
// Now scale the extracted image(s) to the selected aspect ratio
QImage scaledImage[6];
// Double the vertical height first
const QImage doubleHeightImage = interImage.scaled(interImage.width(), interImage.height()*2, Qt::IgnoreAspectRatio, Qt::FastTransformation);
for (int p=0; p<6; p++)
if (!interImage[p].isNull())
if (m_viewAspectRatio == 3)
// Aspect ratio is Pixel 1:2 so we only need to double the vertical height
scaledImage[p] = interImage[p].scaled(interImage[p].width(), interImage[p].height()*2, Qt::IgnoreAspectRatio, Qt::FastTransformation);
else {
// Scale the image in two steps so that smoothing only occurs on vertical lines
// Double the vertical height first
const QImage doubleHeightImage = interImage[p].scaled(interImage[p].width(), interImage[p].height()*2, Qt::IgnoreAspectRatio, Qt::FastTransformation);
// then scale it horizontally to the selected aspect ratio
// Don't smooth GIF as it's bound to break the 256 colour limit
scaledImage[p] = doubleHeightImage.scaled((int)((float)doubleHeightImage.width() * aspectRatioHorizontalScaling[m_viewAspectRatio] * 2), doubleHeightImage.height(), Qt::IgnoreAspectRatio, (suffix == "gif") ? Qt::FastTransformation : Qt::SmoothTransformation);
}
// 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 (suffix == "png") {
if (scaledImage[0].save(exportFileName, "PNG"))
m_exportImageFileName = exportFileName;
else
QMessageBox::warning(this, QApplication::applicationDisplayName(), tr("Cannot export image %1.").arg(QDir::toNativeSeparators(exportFileName)));
}
if (!scaledImage.save(exportFileName, "PNG"))
QMessageBox::warning(this, QApplication::applicationDisplayName(), tr("Cannot export file %1.").arg(QDir::toNativeSeparators(exportFileName)));
} else if (!doubleHeightImage.save(exportFileName, "PNG"))
QMessageBox::warning(this, QApplication::applicationDisplayName(), tr("Cannot export file %1.").arg(QDir::toNativeSeparators(exportFileName)));
if (suffix == "gif") {
QGifImage gif(scaledImage[0].size());
if (scaledImage[3].isNull())
// No flashing
gif.addFrame(scaledImage[0], 0);
else if (interImage[1].isNull()) {
// 1Hz flashing
gif.addFrame(scaledImage[0], 500);
gif.addFrame(scaledImage[3], 500);
} else
// 2Hz flashing
for (int p=0; p<6; p++)
gif.addFrame(scaledImage[p], (p % 3 == 0) ? 166 : 167);
if (gif.save(exportFileName))
m_exportImageFileName = exportFileName;
else
QMessageBox::warning(this, QApplication::applicationDisplayName(), tr("Cannot export image %1.").arg(QDir::toNativeSeparators(exportFileName)));
}
}
void MainWindow::exportZXNet()
@@ -391,9 +476,9 @@ void MainWindow::createActions()
exportEditTFAct->setStatusTip("Export and open this subpage in the edit.tf online editor");
connect(exportEditTFAct, &QAction::triggered, this, &MainWindow::exportEditTF);
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);
QAction *exportImageAct = fileMenu->addAction(tr("Export subpage as image..."));
exportImageAct->setStatusTip("Export an image of this subpage");
connect(exportImageAct, &QAction::triggered, this, &MainWindow::exportImage);
QAction *exportM29Act = fileMenu->addAction(tr("Export subpage X/28 as M/29..."));
exportM29Act->setStatusTip("Export this subpage's X/28 packets as a tti file with M/29 packets");