针对你提出的关于QPixmap::scaled方法中遇到的“pixmap is a null pixmap”错误,以下是一些可能的原因及解决方法,我会按照你提供的提示逐一说明: 确认QPixmap对象是否已正确初始化: 在使用QPixmap对象之前,需要确保它已经被正确初始化。例如,你可以通过默认构造函数或者加载一个图像文件来初始化它。 cpp QPixmap pixm...
QPixmap::scaled: Pixmap is a null pixmap 我的配置如下:一. 移植的时候注意: 1. 配置(configure)的时候加上 -qt-libjpeg 好像默认是加上的。 2. make install 后, 看看安装的目录(前缀/plugins/imageformats)有没有 libjpeg.so 二. 开发板 1. QT 源码修改: 在Qt的pro文件中增加QTPLUGIN += jpeg...
pixmap.drawCircle(150, 150, 32);//画一个空心圆 pixmap.drawRectangle(0, 0, 100, 100);//画一个空心矩形 pixmap.fillCircle(200, 200, 32);//画一个实心圆 pixmap.fillRectangle(0, 200, 50, 50);//画一个实心矩形 //使用pixmap来画一张图 pixmap.drawPixmap(new Pixmap(Gdx.files.internal("gra...
QPixmap()是调用QPixmap的构造函数创建了一个普通的对象。一般QPixmap()这样用的时候一般都是创建临时的,但是把它赋值给了const引用后就有这个引用能访问它了,就不算临时的了。跟直接加=abc没什么本质的区别,一个是新临时对象,一个是已经有标识符的abc对象。 如何用像素数组生成qtgui.qpixmap 从img.pixel返回的...
Read-only mirror of https://gitlab.gnome.org/GNOME/gtk - gtk/gdk/gdkpixmap.c at 279e878bddb61086f813385dc94fd04a5465473a · GNOME/gtk
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The substitution field %T is always mapped to bitmaps, and %S is always mapped to Null. Because there is no string-to-pixmap converter supplied by default, pixmaps are generally set by the application at creation time by first retrieving the pixmap with a call to XmGetPixmap(). XmGet...
If the givensizeis empty, this function returns a null pixmap. In some cases it can be more beneficial to draw the pixmap to a painter with a scale set rather than scaling the pixmap. This is the case when the painter is for instance based on OpenGL or when the scale factor changes ...
If the givensizeis empty, this function returns a null pixmap. In some cases it can be more beneficial to draw the pixmap to a painter with a scale set rather than scaling the pixmap. This is the case when the painter is for instance based on OpenGL or when the scale factor changes ...
If aspectRatioMode is , the pixmap is scaled to a rectangle as small as possible outside size, preserving the aspect ratio.If the given size is empty, this function returns a null pixmap.In some cases it can be more beneficial to draw the pixmap to a painter with a scale set rather ...