URL Rendering

2 files changed, 188 insertions, 0 deletions

diff --git a/url-rendering/main.cpp b/url-rendering/main.cpp
new file mode 100644
index 0000000..243cb2a
--- /dev/null
+++ b/url-rendering/main.cpp
@@ -0,0 +1,167 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the Graphics Dojo project on Qt Labs.
+**
+** This file may be used under the terms of the GNU General Public
+** License version 2.0 or 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of
+** this file.  Please review the following information to ensure GNU
+** General Public Licensing requirements will be met:
+** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+**
+** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+**
+****************************************************************************/
+
+#include <QtGui/QApplication>
+#include <QWebView>
+#include <QNetworkAccessManager>
+#include <QNetworkReply>
+#include <QBuffer>
+#include <QtConcurrentRun>
+#include <QFutureWatcher>
+#include <QDir>
+
+class RendererReply : public QNetworkReply
+{
+    Q_OBJECT
+public:
+    RendererReply(QObject* object, const QNetworkRequest& request)
+        : QNetworkReply(object)
+        , position(0)
+    {
+        setRequest(request);
+        setOperation(QNetworkAccessManager::GetOperation);
+        setHeader(QNetworkRequest::ContentTypeHeader,QVariant("image/png"));
+        open(ReadOnly|Unbuffered);
+        setUrl(request.url());
+        QString pattern = request.url().queryItemValue("pattern");
+        Qt::BrushStyle brushStyle = Qt::SolidPattern;
+        if (pattern == "dense")
+            brushStyle = Qt::Dense2Pattern;
+        else if (pattern == "cross")
+            brushStyle = Qt::CrossPattern;
+        else if (pattern == "diagonal")
+            brushStyle = Qt::FDiagPattern;
+        const QString radiusString = request.url().queryItemValue("radius");
+        const QString widthString = request.url().queryItemValue("width");
+        const QString heightString = request.url().queryItemValue("height");
+        const QString colorString = request.url().queryItemValue("color");
+        QColor color(colorString);
+        bool ok;
+        int radius = radiusString.toInt(&ok);
+        if (!ok)
+            radius = 5;
+        QSize size;
+        size.setWidth(widthString.toInt(&ok));
+        if (!ok)
+            size.setWidth(100);
+        size.setHeight(heightString.toInt(&ok));
+        if (!ok)
+            size.setHeight(100);
+        connect(&watcher, SIGNAL(finished()), SLOT(generateDone()));
+        QFuture<QByteArray> future = QtConcurrent::run<QByteArray>(generate, size, brushStyle, radius, color);
+        watcher.setFuture(future);
+    }
+
+    qint64 readData(char* data, qint64 maxSize)
+    {
+        const qint64 readSize = qMin(maxSize, (qint64)(buffer.size() - position));
+        memcpy(data, buffer.constData() + position, readSize);
+        position += readSize;
+        return readSize;
+    }
+
+    virtual qint64 bytesAvailable() const
+    {
+        return buffer.size() - position;
+    }
+
+    virtual qint64 pos () const
+    {
+        return position;
+    }
+
+    virtual bool seek( qint64 pos )
+    {
+        if (pos < 0 || pos >= buffer.size())
+            return false;
+        position = pos;
+        return true;
+    }
+
+    virtual qint64 size () const
+    {
+        return buffer.size();
+    }
+
+    static QByteArray generate(const QSize& size, const Qt::BrushStyle style, int radius, const QColor& color)
+    {
+        QImage image(size, QImage::Format_ARGB32_Premultiplied);
+        image.fill(0);
+        QPainter painter(&image);
+        QPainterPath path;
+        path.addRoundedRect(QRectF(QPoint(0, 0), size), radius, radius);
+        painter.fillPath(path, QBrush(color, style));
+        QByteArray saveData;
+        QBuffer b(&saveData);
+        image.save(&b, "PNG");
+        return saveData;
+    }
+
+public slots:
+    void generateDone()
+    {
+        setHeader(QNetworkRequest::ContentTypeHeader, "image/png");
+        position = 0;
+        buffer = watcher.result();
+        emit readyRead();
+        emit finished();
+    }
+
+    void abort()
+    {
+    }
+public:
+    QNetworkReply* rawReply;
+private:
+    QFutureWatcher<QByteArray> watcher;
+    QByteArray buffer;
+    int position;
+};
+
+class UrlBasedRenderer : public QNetworkAccessManager
+{
+public:
+    UrlBasedRenderer(QObject* parent = 0) : QNetworkAccessManager(parent)
+    {
+    }
+
+    virtual QNetworkReply *createRequest(Operation op, const QNetworkRequest &request, QIODevice *outgoingData)
+    {
+        if (op != GetOperation || request.url().scheme() != "qt-render" || request.url().host() != "button")
+            return QNetworkAccessManager::createRequest(op, request, outgoingData);
+        return new RendererReply(this, request);
+    }
+};
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+    QWebView webView;
+    UrlBasedRenderer urlBasedRenderer;
+    webView.page()->setNetworkAccessManager(&urlBasedRenderer);
+    webView.setHtml("<HTML><BODY><IMG src=\"qt-render://button?width=100&height=100&radius=5&color=green&pattern=dense\" /></BODY></HTML>");
+    webView.show();
+    return app.exec();
+}
+
+#include <main.moc>
diff --git a/url-rendering/url-rendering.pro b/url-rendering/url-rendering.pro
new file mode 100644
index 0000000..c1cba90
--- /dev/null
+++ b/url-rendering/url-rendering.pro
@@ -0,0 +1,21 @@
+#-------------------------------------------------
+#
+# Project created by QtCreator 2010-10-06T09:10:16
+#
+#-------------------------------------------------
+
+QT       += core gui network webkit
+
+TARGET = url-rendering
+TEMPLATE = app
+
+
+SOURCES += main.cpp
+
+HEADERS  +=
+
+FORMS    +=
+
+RESOURCES +=
+
+OTHER_FILES +=