Qt: Add pure-Qt display backend

src/platform/qt/CMakeLists.txt

@@ -42,6 +42,7 @@ set(SOURCE_FILES
 	ConfigController.cpp
 	Display.cpp
 	DisplayGL.cpp
+	DisplayQt.cpp
 	GBAApp.cpp
 	GBAKeyEditor.cpp
 	GIFView.cpp

src/platform/qt/DisplayQt.cpp

@@ -0,0 +1,82 @@
+/* Copyright (c) 2013-2015 Jeffrey Pfau
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include "DisplayQt.h"
+
+#include <QPainter>
+
+using namespace QGBA;
+
+DisplayQt::DisplayQt(QWidget* parent)
+	: Display(parent)
+	, m_lockAspectRatio(false)
+	, m_filter(false)
+{
+	connect(&m_drawTimer, SIGNAL(timeout()), this, SLOT(update()));
+	m_drawTimer.setInterval(12); // Give update time roughly 4.6ms of clearance
+}
+
+void DisplayQt::startDrawing(const uint32_t* buffer, GBAThread* context) {
+	m_context = context;
+#ifdef COLOR_16_BIT
+#ifdef COLOR_5_6_5
+	m_backing = QImage(reinterpret_cast<const uchar*>(buffer), 256, 256, QImage::Format_RGB16);
+#else
+	m_backing = QImage(reinterpret_cast<const uchar*>(buffer), 256, 256, QImage::Format_RGB555);
+#endif
+#else
+	m_backing = QImage(reinterpret_cast<const uchar*>(buffer), 256, 256, QImage::Format_RGB32);
+#endif
+	m_drawTimer.start();
+}
+
+void DisplayQt::stopDrawing() {
+	m_drawTimer.stop();
+}
+
+void DisplayQt::pauseDrawing() {
+	m_drawTimer.stop();
+}
+
+void DisplayQt::unpauseDrawing() {
+	m_drawTimer.start();
+}
+
+void DisplayQt::forceDraw() {
+	update();
+}
+
+void DisplayQt::lockAspectRatio(bool lock) {
+	m_lockAspectRatio = lock;
+	update();
+}
+
+void DisplayQt::filter(bool filter) {
+	m_filter = filter;
+	update();
+}
+
+void DisplayQt::paintEvent(QPaintEvent*) {
+	QPainter painter(this);
+	painter.fillRect(QRect(QPoint(), size()), Qt::black);
+	if (m_filter) {
+		painter.setRenderHint(QPainter::SmoothPixmapTransform);
+	}
+	QSize s = size();
+	QSize ds = s;
+	if (s.width() * 2 > s.height() * 3) {
+		ds.setWidth(s.height() * 3 / 2);
+	} else if (s.width() * 2 < s.height() * 3) {
+		ds.setHeight(s.width() * 2 / 3);
+	}
+	QPoint origin = QPoint((s.width() - ds.width()) / 2, (s.height() - ds.height()) / 2);
+	QRect full(origin, ds);
+
+#ifdef COLOR_5_6_5
+	painter.drawImage(full, m_backing, QRect(0, 0, 240, 160));
+#else
+	painter.drawImage(full, m_backing.rgbSwapped(), QRect(0, 0, 240, 160));
+#endif
+}

src/platform/qt/DisplayQt.h

@@ -0,0 +1,46 @@
+/* Copyright (c) 2013-2015 Jeffrey Pfau
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef QGBA_DISPLAY_QT
+#define QGBA_DISPLAY_QT
+
+#include "Display.h"
+
+#include <QImage>
+#include <QTimer>
+
+struct GBAThread;
+
+namespace QGBA {
+
+class DisplayQt : public Display {
+Q_OBJECT
+
+public:
+	DisplayQt(QWidget* parent = nullptr);
+
+public slots:
+	void startDrawing(const uint32_t* buffer, GBAThread* context);
+	void stopDrawing();
+	void pauseDrawing();
+	void unpauseDrawing();
+	void forceDraw();
+	void lockAspectRatio(bool lock);
+	void filter(bool filter);
+
+protected:
+	virtual void paintEvent(QPaintEvent*) override;
+
+private:
+	QTimer m_drawTimer;
+	GBAThread* m_context;
+	QImage m_backing;
+	bool m_lockAspectRatio;
+	bool m_filter;
+};
+
+}
+
+#endif

src/platform/qt/Window.cpp

@@ -12,6 +12,7 @@
 #include <QMenuBar>
 #include <QMessageBox>
 #include <QMimeData>
+#include <QPainter>
 #include <QStackedLayout>
 
 #include "CheatsView.h"