Utilities/Memory Viewer: Improve image viewer

* Added image scaling with Ctrl+Plus, Ctrl+Minus.
* Added hover position to see which address is being pointed at, when double clicking on it the image viewer is closed and the memory viewer jumps to the clicked memory data.

rpcs3/rpcs3qt/memory_viewer_panel.cpp

@@ -18,6 +18,8 @@
 #include <QComboBox>
 #include <QCheckBox>
 #include <QWheelEvent>
+#include <QHoverEvent>
+#include <QMouseEvent>
 #include <QTimer>
 #include <QThread>
 #include <QKeyEvent>
@@ -934,8 +936,25 @@ void memory_viewer_panel::keyPressEvent(QKeyEvent* event)
 
 void memory_viewer_panel::ShowImage(QWidget* parent, u32 addr, color_format format, u32 width, u32 height, bool flipv) const
 {
+	u32 texel_bytes = 4;
+
+	switch (format)
+	{
+	case color_format::RGB:
+	{
+		texel_bytes = 3;
+		break;
+	}
+	case color_format::G8:
+	{
+		texel_bytes = 1;
+		break;
+	}
+	default: break;
+	}
+
 	// If exceeds 32-bits it is invalid as well, UINT32_MAX always fails checks
-	const u32 memsize = static_cast<u32>(std::min<u64>(4ull * width * height, u32{umax}));
+	const u32 memsize = utils::mul_saturate<u32>(utils::mul_saturate<u32>(texel_bytes, width), height);
 	if (memsize == 0)
 	{
 		return;
@@ -1084,20 +1103,135 @@ void memory_viewer_panel::ShowImage(QWidget* parent, u32 addr, color_format form
 		}
 	}
 
-	const QImage image(convertedBuffer, width, height, QImage::Format_ARGB32, [](void* buffer){ delete[] static_cast<u8*>(buffer); }, convertedBuffer);
-	if (image.isNull()) return;
+	std::unique_ptr<QImage> image = std::make_unique<QImage>(convertedBuffer, width, height, QImage::Format_ARGB32, [](void* buffer){ delete[] static_cast<u8*>(buffer); }, convertedBuffer);
+	if (image->isNull()) return;
 
 	QLabel* canvas = new QLabel();
 	canvas->setFixedSize(width, height);
-	canvas->setPixmap(QPixmap::fromImage(image.scaled(width, height, Qt::KeepAspectRatio, Qt::SmoothTransformation)));
+	canvas->setAttribute(Qt::WA_Hover);
+	canvas->setPixmap(QPixmap::fromImage(*image));
 
-	QHBoxLayout* layout = new QHBoxLayout();
+	QLabel* image_title = new QLabel();
+
+	QVBoxLayout* layout = new QVBoxLayout();
 	layout->setContentsMargins(0, 0, 0, 0);
+	layout->addWidget(image_title);
 	layout->addWidget(canvas);
 
-	QDialog* f_image_viewer = new QDialog(parent);
+	struct image_viewer : public QDialog
+	{
+		QLabel* const m_canvas;
+		QLabel* const m_image_title;
+		const std::unique_ptr<QImage> m_image;
+		const u32 m_addr;
+		const int m_addr_scale = 1;
+		const u32 m_pitch;
+		const u32 m_width;
+		const u32 m_height;
+		int m_canvas_scale = 1;
+
+		image_viewer(QWidget* parent, QLabel* canvas, QLabel* image_title, std::unique_ptr<QImage> image, u32 addr, u32 addr_scale, u32 pitch, u32 width, u32 height) noexcept
+			: QDialog(parent)
+			, m_canvas(canvas)
+			, m_image_title(image_title)
+			, m_image(std::move(image))
+			, m_addr(addr)
+			, m_addr_scale(addr_scale)
+			, m_pitch(pitch)
+			, m_width(width)
+			, m_height(height)
+		{
+		}
+
+		bool eventFilter(QObject* object, QEvent* event) override
+		{
+			if (object == m_canvas && (event->type() == QEvent::HoverMove || event->type() == QEvent::HoverEnter || event->type() == QEvent::HoverLeave))
+			{
+				const QPoint xy = static_cast<QHoverEvent*>(event)->pos() / m_canvas_scale;
+				set_window_name_by_coordinates(xy.x(), xy.y());
+				return false;
+			}
+
+			if (object == m_canvas && event->type() == QEvent::MouseButtonDblClick && static_cast<QMouseEvent*>(event)->button() == Qt::LeftButton)
+			{
+				QLineEdit* addr_line = static_cast<memory_viewer_panel*>(parent())->m_addr_line;
+
+				const QPoint xy = static_cast<QMouseEvent*>(event)->pos() / m_canvas_scale;
+				addr_line->setText(qstr(fmt::format("%08x", get_pointed_addr(xy.x(), xy.y()))));
+				Q_EMIT addr_line->returnPressed();
+				close();
+				return false;
+			}
+
+			return QDialog::eventFilter(object, event);
+		}
+
+		u32 get_pointed_addr(u32 x, u32 y) const
+		{
+			return m_addr + m_addr_scale * (y * m_pitch + x) / m_canvas_scale;
+		}
+
+		void set_window_name_by_coordinates(int x, int y)
+		{
+			if (x < 0 || y < 0)
+			{
+				m_image_title->setText(qstr(fmt::format("[-, -]: NA")));
+				return;
+			}
+
+			m_image_title->setText(qstr(fmt::format("[x:%d, y:%d]: 0x%x", x, y, get_pointed_addr(x, y))));
+		}
+
+		void keyPressEvent(QKeyEvent* event) override
+		{
+			if (!isActiveWindow())
+			{
+				QDialog::keyPressEvent(event);
+				return;
+			}
+
+			if (event->modifiers() == Qt::ControlModifier)
+			{
+				switch (const auto key = event->key())
+				{
+				case Qt::Key_Equal: // Also plus
+				case Qt::Key_Plus:
+				case Qt::Key_Minus:
+				{
+					m_canvas_scale = std::clamp(m_canvas_scale + (key == Qt::Key_Minus ? -1 : 1), 1, 5);
+
+					const QSize fixed_size(m_width * m_canvas_scale, m_height * m_canvas_scale);
+
+					// Fast transformation makes it not blurry, does not use bilinear filtering
+					m_canvas->setPixmap(QPixmap::fromImage(m_image->scaled(fixed_size.width(), fixed_size.height(), Qt::KeepAspectRatio, Qt::FastTransformation)));
+
+					m_canvas->setFixedSize(fixed_size);
+
+					QTimer::singleShot(0, this, [this]()
+					{
+						// sizeHint() evaluates properly after events have been processed
+						setFixedSize(sizeHint());
+					});
+
+					break;
+				}
+				}
+			}
+
+			QDialog::keyPressEvent(event);
+		}
+	};
+
+	image_viewer* f_image_viewer = new image_viewer(parent, canvas, image_title, std::move(image), addr, texel_bytes, width, width, height);
+	canvas->installEventFilter(f_image_viewer);
 	f_image_viewer->setWindowTitle(qstr(fmt::format("Raw Image @ 0x%x", addr)));
-	f_image_viewer->setFixedSize(QSize(width, height));
 	f_image_viewer->setLayout(layout);
+	f_image_viewer->setAttribute(Qt::WA_DeleteOnClose);
 	f_image_viewer->show();
+
+	QTimer::singleShot(0, f_image_viewer, [f_image_viewer]()
+	{
+		// sizeHint() evaluates properly after events have been processed
+		f_image_viewer->setFixedSize(f_image_viewer->sizeHint());
+	});
 }