Add QtPaintDevice and initial QtWidget

QtGui/QtPaintDevice.h

@@ -0,0 +1,25 @@
+#import <ObjFW/ObjFW.h>
+
+#include <QPaintDevice>
+
+@protocol QtPaintDevice
+- (QPaintDevice*)qPaintDevice;
+- (int)colorCount;
+- (int)depth;
+- (int)devicePixelRatio;
+- (double)devicePixelRatioF;
+- (int)height;
+- (int)heightMM;
+- (int)logicalDPIX;
+- (int)logicalDPIY;
+- (QPaintEngine*)paintEngine;
+- (bool)paintingActive;
+- (int)physicalDPIX;
+- (int)physicalDPIY;
+- (int)width;
+- (int)widthMM;
+@end
+
+@interface QtPaintDevice: OFObject <QtPaintDevice>
+@property (readonly) QObject *qObject;
+@end

QtGui/QtPaintDevice.mm

@@ -0,0 +1,82 @@
+#import "QtPaintDevice.h"
+
+#include <QObject>
+
+@implementation QtPaintDevice
+@dynamic qObject;
+
+- (QPaintDevice*)qPaintDevice
+{
+	return dynamic_cast<QPaintDevice*>([self qObject]);
+}
+
+- (int)colorCount
+{
+	return [self qPaintDevice]->colorCount();
+}
+
+- (int)depth
+{
+	return [self qPaintDevice]->depth();
+}
+
+- (int)devicePixelRatio
+{
+	return [self qPaintDevice]->devicePixelRatio();
+}
+
+- (double)devicePixelRatioF
+{
+	return [self qPaintDevice]->devicePixelRatioF();
+}
+
+- (int)height
+{
+	return [self qPaintDevice]->height();
+}
+
+- (int)heightMM
+{
+	return [self qPaintDevice]->heightMM();
+}
+
+- (int)logicalDPIX
+{
+	return [self qPaintDevice]->logicalDpiX();
+}
+
+- (int)logicalDPIY
+{
+	return [self qPaintDevice]->logicalDpiY();
+}
+
+- (QPaintEngine*)paintEngine
+{
+	return [self qPaintDevice]->paintEngine();
+}
+
+- (bool)paintingActive
+{
+	return [self qPaintDevice]->paintingActive();
+}
+
+- (int)physicalDPIX
+{
+	return [self qPaintDevice]->physicalDpiX();
+}
+
+- (int)physicalDPIY
+{
+	return [self qPaintDevice]->physicalDpiY();
+}
+
+- (int)width
+{
+	return [self qPaintDevice]->width();
+}
+
+- (int)widthMM
+{
+	return [self qPaintDevice]->widthMM();
+}
+@end