Qt: Add edit function to debugger memory view

src/core/bus.cpp

@@ -805,26 +805,31 @@ std::optional<Bus::MemoryRegion> Bus::GetMemoryRegionForAddress(PhysicalMemoryAd
   return std::nullopt;
 }
 
-static constexpr std::array<std::pair<PhysicalMemoryAddress, PhysicalMemoryAddress>,
+static constexpr std::array<std::tuple<PhysicalMemoryAddress, PhysicalMemoryAddress, bool>,
                             static_cast<u32>(Bus::MemoryRegion::Count)>
   s_code_region_ranges = {{
-    {0, Bus::RAM_2MB_SIZE},
-    {Bus::RAM_2MB_SIZE, Bus::RAM_2MB_SIZE * 2},
-    {Bus::RAM_2MB_SIZE * 2, Bus::RAM_2MB_SIZE * 3},
-    {Bus::RAM_2MB_SIZE * 3, Bus::RAM_MIRROR_END},
-    {Bus::EXP1_BASE, Bus::EXP1_BASE + Bus::EXP1_SIZE},
-    {CPU::SCRATCHPAD_ADDR, CPU::SCRATCHPAD_ADDR + CPU::SCRATCHPAD_SIZE},
-    {Bus::BIOS_BASE, Bus::BIOS_BASE + Bus::BIOS_SIZE},
+    {0, Bus::RAM_2MB_SIZE, true},
+    {Bus::RAM_2MB_SIZE, Bus::RAM_2MB_SIZE * 2, true},
+    {Bus::RAM_2MB_SIZE * 2, Bus::RAM_2MB_SIZE * 3, true},
+    {Bus::RAM_2MB_SIZE * 3, Bus::RAM_MIRROR_END, true},
+    {Bus::EXP1_BASE, Bus::EXP1_BASE + Bus::EXP1_SIZE, false},
+    {CPU::SCRATCHPAD_ADDR, CPU::SCRATCHPAD_ADDR + CPU::SCRATCHPAD_SIZE, true},
+    {Bus::BIOS_BASE, Bus::BIOS_BASE + Bus::BIOS_SIZE, false},
   }};
 
 PhysicalMemoryAddress Bus::GetMemoryRegionStart(MemoryRegion region)
 {
-  return s_code_region_ranges[static_cast<u32>(region)].first;
+  return std::get<0>(s_code_region_ranges[static_cast<u32>(region)]);
 }
 
 PhysicalMemoryAddress Bus::GetMemoryRegionEnd(MemoryRegion region)
 {
-  return s_code_region_ranges[static_cast<u32>(region)].second;
+  return std::get<1>(s_code_region_ranges[static_cast<u32>(region)]);
+}
+
+bool Bus::IsMemoryRegionWritable(MemoryRegion region)
+{
+  return std::get<2>(s_code_region_ranges[static_cast<u32>(region)]);
 }
 
 u8* Bus::GetMemoryRegionPointer(MemoryRegion region)

src/core/bus.h

@@ -221,6 +221,7 @@ enum class MemoryRegion
 std::optional<MemoryRegion> GetMemoryRegionForAddress(PhysicalMemoryAddress address);
 PhysicalMemoryAddress GetMemoryRegionStart(MemoryRegion region);
 PhysicalMemoryAddress GetMemoryRegionEnd(MemoryRegion region);
+bool IsMemoryRegionWritable(MemoryRegion region);
 u8* GetMemoryRegionPointer(MemoryRegion region);
 std::optional<PhysicalMemoryAddress> SearchMemory(PhysicalMemoryAddress start_address, const u8* pattern,
                                                   const u8* mask, u32 pattern_length);

src/duckstation-qt/debuggerwindow.cpp

@@ -547,7 +547,8 @@ void DebuggerWindow::setMemoryViewRegion(Bus::MemoryRegion region)
 
   const PhysicalMemoryAddress start = Bus::GetMemoryRegionStart(region);
   const PhysicalMemoryAddress end = Bus::GetMemoryRegionEnd(region);
-  m_ui.memoryView->setData(start, Bus::GetMemoryRegionPointer(region), end - start);
+  m_ui.memoryView->setData(start, Bus::GetMemoryRegionPointer(region), end - start,
+                           Bus::IsMemoryRegionWritable(region));
 
 #define SET_REGION_RADIO_BUTTON(name, rb_region)                                                                       \
   do                                                                                                                   \

src/duckstation-qt/memoryviewwidget.cpp

@@ -1,10 +1,14 @@
 #include "memoryviewwidget.h"
+
+#include <QtGui/QKeyEvent>
+#include <QtGui/QMouseEvent>
 #include <QtGui/QPainter>
 #include <QtWidgets/QScrollBar>
 #include <cstring>
 
 MemoryViewWidget::MemoryViewWidget(QWidget* parent /* = nullptr */, size_t address_offset /* = 0 */,
-                                   const void* data_ptr /* = nullptr */, size_t data_size /* = 0 */)
+                                   void* data_ptr /* = nullptr */, size_t data_size /* = 0 */,
+                                   bool data_editable /* = false */)
   : QAbstractScrollArea(parent)
 {
   m_bytes_per_line = 16;
@@ -15,7 +19,7 @@ MemoryViewWidget::MemoryViewWidget(QWidget* parent /* = nullptr */, size_t addre
   connect(horizontalScrollBar(), &QScrollBar::valueChanged, this, &MemoryViewWidget::adjustContent);
 
   if (data_ptr)
-    setData(address_offset, data_ptr, data_size);
+    setData(address_offset, data_ptr, data_size, data_editable);
 }
 
 MemoryViewWidget::~MemoryViewWidget() = default;
@@ -42,11 +46,13 @@ void MemoryViewWidget::updateMetrics()
   m_char_height = fm.height();
 }
 
-void MemoryViewWidget::setData(size_t address_offset, const void* data_ptr, size_t data_size)
+void MemoryViewWidget::setData(size_t address_offset, void* data_ptr, size_t data_size, bool data_editable)
 {
   m_data = data_ptr;
   m_data_size = data_size;
+  m_data_editable = data_editable;
   m_address_offset = address_offset;
+  m_selected_address = INVALID_SELECTED_ADDRESS;
   adjustContent();
 }
 
@@ -84,18 +90,92 @@ void MemoryViewWidget::setFont(const QFont& font)
   updateMetrics();
 }
 
-void MemoryViewWidget::resizeEvent(QResizeEvent*)
+void MemoryViewWidget::resizeEvent(QResizeEvent* event)
 {
   adjustContent();
 }
 
+void MemoryViewWidget::mousePressEvent(QMouseEvent* event)
+{
+  if ((event->buttons() & Qt::LeftButton) != 0)
+    updateSelectedByte(event->pos());
+
+  QAbstractScrollArea::mousePressEvent(event);
+}
+
+void MemoryViewWidget::mouseMoveEvent(QMouseEvent* event)
+{
+  if ((event->buttons() & Qt::LeftButton) != 0)
+    updateSelectedByte(event->pos());
+
+  QAbstractScrollArea::mouseMoveEvent(event);
+}
+
+void MemoryViewWidget::keyPressEvent(QKeyEvent* event)
+{
+  if (m_selected_address < m_data_size && m_data_editable)
+  {
+    const int key = event->key();
+    if (key == Qt::Key_Backspace)
+    {
+      if (m_selected_address > 0)
+      {
+        m_selected_address--;
+        m_editing_nibble = -1;
+        viewport()->update();
+      }
+    }
+    else
+    {
+      const QString key_text = event->text();
+      if (key_text.length() == 1)
+      {
+        const char ch = key_text[0].toLatin1();
+        if (m_selection_was_ascii)
+        {
+          std::memcpy(static_cast<unsigned char*>(m_data) + m_selected_address, &ch, sizeof(unsigned char));
+          m_selected_address = std::min(m_selected_address + 1, m_data_size - 1);
+          viewport()->update();
+        }
+        else
+        {
+          int nibble = -1;
+          if (ch >= 'a' && ch <= 'f')
+            nibble = ch - 'a' + 0xa;
+          else if (ch >= 'A' && ch <= 'F')
+            nibble = ch - 'A' + 0xa;
+          else if (ch >= '0' && ch <= '9')
+            nibble = ch - '0';
+          if (nibble >= 0)
+          {
+            m_editing_nibble++;
+
+            unsigned char* pdata = static_cast<unsigned char*>(m_data) + m_selected_address;
+            *pdata = (*pdata & ~(0xf0 >> (m_editing_nibble * 4))) | (nibble << ((1 - m_editing_nibble) * 4));
+
+            if (m_editing_nibble == 1)
+            {
+              m_editing_nibble = -1;
+              m_selected_address = std::min(m_selected_address + 1, m_data_size - 1);
+            }
+
+            viewport()->update();
+          }
+        }
+      }
+    }
+  }
+
+  QAbstractScrollArea::keyPressEvent(event);
+}
+
 template<typename T>
 static bool RangesOverlap(T x1, T x2, T y1, T y2)
 {
   return (x2 >= y1 && x1 < y2);
 }
 
-void MemoryViewWidget::paintEvent(QPaintEvent*)
+void MemoryViewWidget::paintEvent(QPaintEvent* event)
 {
   QPainter painter(viewport());
   painter.setFont(font());
@@ -103,12 +183,15 @@ void MemoryViewWidget::paintEvent(QPaintEvent*)
     return;
 
   const QColor highlight_color(100, 100, 0);
+  const QColor selected_color = viewport()->palette().color(QPalette::Highlight);
+  const QColor text_color = viewport()->palette().color(QPalette::WindowText);
+  const QColor edited_color(255, 0, 0);
   const int offsetX = horizontalScrollBar()->value();
 
   int y = m_char_height;
   QString address;
 
-  painter.setPen(viewport()->palette().color(QPalette::WindowText));
+  painter.setPen(text_color);
 
   y += m_char_height;
 
@@ -162,10 +245,25 @@ void MemoryViewWidget::paintEvent(QPaintEvent*)
     {
       unsigned char value;
       std::memcpy(&value, static_cast<const unsigned char*>(m_data) + offset, sizeof(value));
-      if (offset >= m_highlight_start && offset < m_highlight_end)
-        painter.fillRect(x - m_char_width, y - m_char_height + 3, HEX_CHAR_WIDTH, m_char_height, highlight_color);
+      if (m_selected_address == offset)
+        painter.fillRect(x - m_char_width, y - m_char_height + 4, HEX_CHAR_WIDTH, m_char_height, selected_color);
+      else if (offset >= m_highlight_start && offset < m_highlight_end)
+        painter.fillRect(x - m_char_width, y - m_char_height + 4, HEX_CHAR_WIDTH, m_char_height, highlight_color);
+
+      if (m_selected_address != offset || m_editing_nibble != 0 || m_selection_was_ascii) [[likely]]
+      {
+        painter.drawText(x, y, QString::asprintf("%02X", value));
+      }
+      else
+      {
+        const QString high = QString::asprintf("%X", value >> 4);
+        const QRect low_rc = painter.boundingRect(x, y, HEX_CHAR_WIDTH, m_char_height, 0, high);
+        painter.setPen(edited_color);
+        painter.drawText(x, y, high);
+        painter.setPen(text_color);
+        painter.drawText(x + low_rc.width(), y, QString::asprintf("%X", (value & 0xF)));
+      }
 
-      painter.drawText(x, y, QString::asprintf("%02X", value));
       x += HEX_CHAR_WIDTH;
     }
     y += m_char_height;
@@ -195,8 +293,10 @@ void MemoryViewWidget::paintEvent(QPaintEvent*)
     {
       unsigned char value;
       std::memcpy(&value, static_cast<const unsigned char*>(m_data) + offset, sizeof(value));
-      if (offset >= m_highlight_start && offset < m_highlight_end)
-        painter.fillRect(x, y - m_char_height + 3, 2 * m_char_width, m_char_height, highlight_color);
+      if (m_selected_address == offset)
+        painter.fillRect(x, y - m_char_height + 4, 2 * m_char_width, m_char_height, selected_color);
+      else if (offset >= m_highlight_start && offset < m_highlight_end)
+        painter.fillRect(x, y - m_char_height + 4, 2 * m_char_width, m_char_height, highlight_color);
 
       if (!std::isprint(value))
         value = '.';
@@ -207,6 +307,57 @@ void MemoryViewWidget::paintEvent(QPaintEvent*)
   }
 }
 
+void MemoryViewWidget::updateSelectedByte(const QPoint& pos)
+{
+  const int xpos = pos.x() + horizontalScrollBar()->value();
+  const int ypos = pos.y();
+
+  size_t new_selection = INVALID_SELECTED_ADDRESS;
+  bool new_ascii = false;
+
+  // to left or above hex view
+  const int addr_width = addressWidth();
+  if (xpos >= addr_width && ypos >= m_char_height)
+  {
+    const int row = (ypos - m_char_height) / m_char_height;
+    const size_t row_address = m_start_offset + (static_cast<unsigned>(row) * m_bytes_per_line);
+
+    // out of Y range
+    if (row_address < m_end_offset)
+    {
+      // in hex view?
+      const int hex_end = addr_width + hexWidth() + m_char_width;
+      if (xpos < hex_end)
+      {
+        const int hex_char_width = 4 * m_char_width;
+        const int hex_offset = (xpos - addr_width) / hex_char_width;
+        new_selection = row_address + static_cast<size_t>(hex_offset);
+      }
+      else
+      {
+        // in ascii view?
+        const int ascii_char_width = 2 * m_char_width;
+        const int ascii_end = hex_end + (m_bytes_per_line * ascii_char_width);
+
+        // might be offscreen again
+        if (xpos < ascii_end)
+        {
+          const int ascii_offset = (xpos - hex_end) / ascii_char_width;
+          new_selection = row_address + static_cast<size_t>(ascii_offset);
+          new_ascii = true;
+        }
+      }
+    }
+  }
+
+  if (new_selection != m_selected_address || new_ascii != m_selection_was_ascii)
+  {
+    m_selected_address = new_selection;
+    m_selection_was_ascii = new_ascii;
+    viewport()->update();
+  }
+}
+
 void MemoryViewWidget::adjustContent()
 {
   if (!m_data)

src/duckstation-qt/memoryviewwidget.h

@@ -8,13 +8,13 @@ class MemoryViewWidget : public QAbstractScrollArea
 public:
   Q_OBJECT
 public:
-  MemoryViewWidget(QWidget* parent = nullptr, size_t address_offset = 0, const void* data_ptr = nullptr,
-                   size_t data_size = 0);
+  MemoryViewWidget(QWidget* parent = nullptr, size_t address_offset = 0, void* data_ptr = nullptr, size_t data_size = 0,
+                   bool data_editable = false);
   ~MemoryViewWidget();
 
   size_t addressOffset() const { return m_address_offset; }
 
-  void setData(size_t address_offset, const void* data_ptr, size_t data_size);
+  void setData(size_t address_offset, void* data_ptr, size_t data_size, bool data_editable);
   void setHighlightRange(size_t start, size_t end);
   void clearHighlightRange();
   void scrolltoOffset(size_t offset);
@@ -22,19 +22,25 @@ public:
   void setFont(const QFont& font);
 
 protected:
-  void paintEvent(QPaintEvent*);
-  void resizeEvent(QResizeEvent*);
+  void paintEvent(QPaintEvent* event);
+  void resizeEvent(QResizeEvent* event);
+  void mousePressEvent(QMouseEvent* event);
+  void mouseMoveEvent(QMouseEvent* event);
+  void keyPressEvent(QKeyEvent* event);
 
 private Q_SLOTS:
   void adjustContent();
 
 private:
+  static constexpr size_t INVALID_SELECTED_ADDRESS = ~static_cast<size_t>(0);
+
   int addressWidth() const;
   int hexWidth() const;
   int asciiWidth() const;
   void updateMetrics();
+  void updateSelectedByte(const QPoint& pos);
 
-  const void* m_data;
+  void* m_data;
   size_t m_data_size;
   size_t m_address_offset;
 
@@ -44,6 +50,11 @@ private:
   size_t m_highlight_start = 0;
   size_t m_highlight_end = 0;
 
+  size_t m_selected_address = INVALID_SELECTED_ADDRESS;
+  int m_editing_nibble = -1;
+  bool m_selection_was_ascii = false;
+  bool m_data_editable = false;
+
   unsigned m_bytes_per_line;
 
   int m_char_width;