![qimage one qimage one](https://i1.wp.com/therealhax.com/wp-content/uploads/2020/06/Qimage-Ultimate-1.png)
InputImg = new QImage("/home/tufan/wallpaper.png") When youre using a QImage, the image data is stored your applications memory in a format of your choosing. ShowQImageDialog::ShowQImageDialog(QWidget *parent) : QDialog(parent) QPixmap and QImage both contain images, but there is a key difference between the two thats important to understand when writing graphics code. It can be done by writing the buffer to a temporary file, and then loading. I have searched Qts documentation extensively and believe this cant be done with one simple function. The textures are in main memory not in the graphics card memory. ShowQImageDialog.cpp file contains implementation details for extended QDialog class. I have DDS textures (DXT1, DXT3, DXT5) in a memory buffer. ShowQImageDialog.h file is the extended QDialog class header file. Main.cpp file contains the custom QDialog instance and shows it. ShowQImageDialog.pro is the project configuration file and contains: Project Directory Structure in Qt Creator IDE : ShowQImageDialog constructor creates a QGridLayout instance that is containing a QScrollArea inside it and displays the image in this area. Sample project started as a QT Gui Application and contains main.cpp, ShowQImageDialog.h and ShowQImageDialog.cpp files. By setting the pixmap value of QLabel from setPixmap function, QLabel displays content of QImage. Constructed QImages can be displayed in a QLabel. In paintEvent() we draw the QPixmap containing our image onto the window.QImage enables to construct images from file paths on the disk. Here we setup a simple window which is used for displaying the image.
![qimage one qimage one](https://www.binartem.com/wp-content/uploads/2017/12/Screen-Shot-2017-12-16-at-1.47.41-PM.png)
![qimage one qimage one](http://guerboiscafe.com/wp-content/uploads/wpforo/attachments/2/thumbnail/146-QimageOne-3.png)
TimeConsumingThread(QObject *parent = 0) QImage myQImage(600, 600, QImage::Format_RGB32) Ĭlass timeConsumingThread : public QThread TimeConsumingThread::timeConsumingThread(QObject *parent) thread which runs the time-consuming image generation After the image has been generated, we emit a signal containing the image. In this example, the rendering of the image doesn't actually take too long and is just a very simple abstract image. Here we have the time-consuming image generation in the run() reimplementation. ImageWindow->plot = QPixmap::fromImage(image) Void Window::displayImage(const QImage &image) This, SLOT(displayImage(const QImage &))) slot to respond to the QImage generation threadĬonnect(otherThread, SIGNAL(theImage(const QImage &)), RunButton = new QPushButton("Generate image.") Window::Window(QWidget *parent) : QWidget(parent) Using Qt's signals and slots, when the image has been generated, it is sent to the GUI thread and then displayed on the screen. When the button is clicked, an abstract image is generated in another thread when QThread::start() is called. Here we make a simple GUI containing just a single button. The example consists of the following files: main.C, window.C, window.h, thread.C, thread.h, imagewindow.C and imagewindow.h. It is important to remember that while a QImage can be made outside the GUI thread, this cannot be done for QPixmaps or QWidgets, for example (QPixmaps and QWidgets can only be used in the GUI thread).
QIMAGE ONE CODE
This example is similar to the Mandelbrot example code in the Qt documentation, however the code presented here is much simpler and easier to follow. Here we consider the situation when a GUI-driven application needs to generate a QImage, however, due to the time required to generate the QImage, the GUI would freeze unless the QImage is generated in a separate thread.