qt 6.5.1 original

tests/manual/windowtransparency/CMakeLists.txt

@@ -0,0 +1,15 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#####################################################################
+## windowtransparency Binary:
+#####################################################################
+
+qt_internal_add_manual_test(windowtransparency
+    SOURCES
+        windowtransparency.cpp
+    LIBRARIES
+        Qt::Gui
+        Qt::Widgets
+        Qt::OpenGL
+)

tests/manual/windowtransparency/windowtransparency.cpp

@@ -0,0 +1,165 @@
+// Copyright (C) 2017 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include <QtGui>
+#include <QtWidgets>
+#include <QtOpenGL/QOpenGLShaderProgram>
+
+class GLWindow : public QWindow
+{
+public:
+    GLWindow(Qt::WindowFlags flags)
+        : gl(0)
+    {
+        setFlags(flags);
+        setSurfaceType(OpenGLSurface);
+
+        QSurfaceFormat format;
+        format.setAlphaBufferSize(8);
+        format.setSamples(16);
+        setFormat(format);
+    }
+
+    void exposeEvent(QExposeEvent *)
+    {
+        if (!isExposed())
+            return;
+
+        if (!gl) {
+            gl = new QOpenGLContext();
+            gl->setFormat(requestedFormat());
+            gl->create();
+        }
+
+        gl->makeCurrent(this);
+
+        QOpenGLShaderProgram prog;
+        prog.addShaderFromSourceCode(QOpenGLShader::Vertex,
+                                     "attribute highp vec4 a_Pos;"
+                                     "attribute lowp vec4 a_Color;"
+                                     "varying lowp vec4 v_Color;"
+                                     "void main() {"
+                                     "    gl_Position = a_Pos;"
+                                     "    v_Color = a_Color;"
+                                     "}");
+        prog.addShaderFromSourceCode(QOpenGLShader::Fragment,
+                                     "varying lowp vec4 v_Color;"
+                                     "void main() {"
+                                     "    gl_FragColor = v_Color;"
+                                     "}");
+        prog.bind();
+
+        QOpenGLFunctions *functions = gl->functions();
+        functions->glClearColor(0, 0, 0, 0);
+        functions->glClear(GL_COLOR_BUFFER_BIT);
+        functions->glViewport(0, 0, width(), height());
+
+        prog.enableAttributeArray("a_Pos");
+        prog.enableAttributeArray("a_Color");
+
+        float coords[] = { -0.7f,  0.7f,
+                            0.8f,  0.8f,
+                           -0.8f, -0.8f,
+                            0.7f, -0.7f };
+        float colors[] = { 1, 0, 0, 1,
+                           0, 1, 0, 1,
+                           0, 0, 1, 1,
+                           0, 0, 0, 0 };
+
+        prog.setAttributeArray("a_Pos", GL_FLOAT, coords, 2, 0);
+        prog.setAttributeArray("a_Color", GL_FLOAT, colors, 4, 0);
+
+        functions->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+        prog.disableAttributeArray("a_Pos");
+        prog.disableAttributeArray("a_Color");
+
+        gl->swapBuffers(this);
+    }
+
+    void mousePressEvent(QMouseEvent *)
+    {
+        QCoreApplication::quit();
+    }
+
+private:
+    QOpenGLContext *gl;
+};
+
+class Widget : public QWidget
+{
+public:
+    Widget(Qt::WindowFlags flags)
+        : QWidget(0, flags)
+    {
+        setAttribute(Qt::WA_TranslucentBackground);
+    }
+
+    void paintEvent(QPaintEvent *)
+    {
+        QPainter p(this);
+
+        p.setRenderHint(QPainter::Antialiasing);
+
+        p.fillRect(rect(), QColor("steelblue"));
+
+        int w = width();
+        int h = height();
+        int w2 = width() / 2;
+        int h2 = height() / 2;
+
+        QPainterPath path;
+        path.moveTo(0, 0);
+        path.cubicTo(w2, 0,  w2, h2, w, h);
+        path.cubicTo(w2, h, w2, h2, 0, 0);
+
+        QLinearGradient lg(0, 0, w, h);
+        lg.setColorAt(0.0, Qt::transparent);
+        lg.setColorAt(0.5, QColor("palegreen"));
+        lg.setColorAt(1.0, Qt::transparent);
+
+        p.setCompositionMode(QPainter::CompositionMode_Source);
+        p.fillPath(path, lg);
+    }
+
+    void mousePressEvent(QMouseEvent *)
+    {
+        QCoreApplication::quit();
+    }
+
+};
+
+int main(int argc, char **argv)
+{
+    QApplication app(argc, argv);
+
+    // mask: on/off
+    // opacity: on/off
+
+    for (int i=0; i<4; ++i) {
+        bool mask = i & 0x1;
+        bool opacity = i & 0x2;
+
+        Qt::WindowFlags flags = Qt::FramelessWindowHint;
+
+        Widget *widget = new Widget(flags);
+        GLWindow *window = new GLWindow(flags);
+
+        widget->setGeometry(100 + 100 * i, 100, 80, 80);
+        window->setGeometry(100 + 100 * i, 200, 80, 80);
+        if (mask) {
+            QRegion region(0, 0, 80, 80, QRegion::Ellipse);
+            widget->setMask(region);
+            window->setMask(region);
+        }
+        if (opacity) {
+            widget->setWindowOpacity(0.5);
+            window->setOpacity(0.5);
+        }
+
+        widget->show();
+        window->show();
+    }
+
+    return app.exec();
+}

tests/manual/windowtransparency/windowtransparency.pro

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+QT += widgets
+
+SOURCES += \
+    windowtransparency.cpp
+
+CONFIG += console