Add examples

Author: Xu Shaohua

examples/qtheif/main.cpp

@@ -0,0 +1,37 @@
+
+#include <QApplication>
+#include <QDebug>
+#include <QImage>
+#include <QLabel>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+
+    for (int i = 1; i < argc; i++) {
+        const QString imgPath(argv[i]);
+        QImage image(imgPath);
+        if (!image.isNull()) {
+            qDebug() << "image size:" << image.size();
+            QLabel* label = new QLabel();
+            int w = 0;
+            int h = 0;
+            if (image.width() > image.height()) {
+                w = 1400;
+                h = (1.0 * image.height()) / (1.0 * image.width() * 1400);
+            } else {
+                h = 1400;
+                w = (1.0 * 1400 * image.height()) /(1.0 * image.width());
+            }
+            qDebug() << w << h;
+            const QPixmap pixmap = QPixmap::fromImage(image);
+            label->setPixmap(pixmap);
+            label->show();
+            label->resize(image.size());
+        } else {
+            qCritical() << "Invalid image:" << imgPath;
+        }
+    }
+
+    return a.exec();
+}

examples/qtheif/qtheif.pro

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+#-------------------------------------------------
+#
+# Project created by QtCreator 2018-06-04T17:24:34
+#
+#-------------------------------------------------
+
+QT       += core gui
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+TARGET = qtheif
+TEMPLATE = app
+
+# The following define makes your compiler emit warnings if you use
+# any feature of Qt which as been marked as deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if you use deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+
+SOURCES += \
+        main.cpp