Qt: Fix low-resolution icon

CMakeLists.txt

@@ -805,7 +805,7 @@ if(CMAKE_SYSTEM_NAME MATCHES "Linux|FreeBSD|OpenBSD")
   install(FILES Data/dolphin-emu.svg
           DESTINATION ${CMAKE_INSTALL_PREFIX}/share/icons/hicolor/scalable/apps)
   install(FILES Data/dolphin-emu.png
-          DESTINATION ${CMAKE_INSTALL_PREFIX}/share/icons/hicolor/48x48/apps)
+          DESTINATION ${CMAKE_INSTALL_PREFIX}/share/icons/hicolor/256x256/apps)
   install(FILES Data/dolphin-emu.desktop
           DESTINATION ${CMAKE_INSTALL_PREFIX}/share/applications)
   # Install manpages

Source/Core/DolphinQt2/CMakeLists.txt

@@ -102,6 +102,7 @@ set(SRCS
   QtUtils/ImageConverter.cpp
   QtUtils/ListTabWidget.cpp
   QtUtils/WindowActivationEventFilter.cpp
+  QtUtils/WinIconHelper.cpp
   QtUtils/WrapInScrollArea.cpp
   QtUtils/AspectRatioWidget.cpp
   Settings/AdvancedPane.cpp

Source/Core/DolphinQt2/DolphinQt2.vcxproj

@@ -248,6 +248,7 @@
     <ClCompile Include="Debugger\CodeViewWidget.cpp" />
     <ClCompile Include="Debugger\CodeWidget.cpp" />
     <ClCompile Include="FIFOPlayerWindow.cpp" />
+    <ClCompile Include="QtUtils\WinIconHelper.cpp" />
     <ClCompile Include="TAS\GCTASInputWindow.cpp" />
     <ClCompile Include="TAS\WiiTASInputWindow.cpp" />
     <ClCompile Include="TAS\StickWidget.cpp" />
@@ -310,6 +311,7 @@
     <ClInclude Include="Config\Mapping\HotkeyGraphics.h" />
     <ClInclude Include="Config\Mapping\HotkeyStates.h" />
     <ClInclude Include="Config\Mapping\HotkeyTAS.h" />
+    <ClInclude Include="QtUtils\WinIconHelper.h" />
     <ClInclude Include="TAS\Shared.h" />
     <ClInclude Include="Config\Mapping\HotkeyWii.h" />
     <ClInclude Include="Config\Mapping\MappingBool.h" />

Source/Core/DolphinQt2/MainWindow.cpp

@@ -85,7 +85,7 @@
 MainWindow::MainWindow(std::unique_ptr<BootParameters> boot_parameters) : QMainWindow(nullptr)
 {
   setWindowTitle(QString::fromStdString(Common::scm_rev_str));
-  setWindowIcon(QIcon(Resources::GetMisc(Resources::LOGO_SMALL)));
+  setWindowIcon(Resources::GetAppIcon());
   setUnifiedTitleAndToolBarOnMac(true);
   setAcceptDrops(true);
 

Source/Core/DolphinQt2/QtUtils/WinIconHelper.cpp

@@ -0,0 +1,94 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "DolphinQt2/QtUtils/WinIconHelper.h"
+
+#ifdef _WIN32
+
+#include <Windows.h>
+
+// The following code is adapted from qpixmap_win.cpp (c) The Qt Company Ltd. (https://qt.io)
+// Licensed under the GNU GPL v3
+static inline BITMAPINFO GetBMI(int width, int height, bool topToBottom)
+{
+  BITMAPINFO bmi = {};
+  auto& bih = bmi.bmiHeader;
+
+  bih.biSize = sizeof(BITMAPINFOHEADER);
+  bih.biWidth = width;
+  bih.biHeight = topToBottom ? -height : height;
+  bih.biPlanes = 1;
+  bih.biBitCount = 32;
+  bih.biCompression = BI_RGB;
+  bih.biSizeImage = width * height * 4;
+
+  return bmi;
+}
+
+static QPixmap PixmapFromHICON(HICON icon)
+{
+  HDC screenDevice = GetDC(0);
+  HDC hdc = CreateCompatibleDC(screenDevice);
+  ReleaseDC(0, screenDevice);
+  ICONINFO iconinfo;
+  const bool result = GetIconInfo(icon, &iconinfo);  // x and y Hotspot describes the icon center
+  if (!result)
+  {
+    qErrnoWarning("QPixmap::fromWinHICON(), failed to GetIconInfo()");
+    DeleteDC(hdc);
+    return QPixmap();
+  }
+  const int w = iconinfo.xHotspot * 2;
+  const int h = iconinfo.yHotspot * 2;
+  BITMAPINFO bitmapInfo = GetBMI(w, h, false);
+  DWORD* bits;
+  HBITMAP winBitmap = CreateDIBSection(hdc, &bitmapInfo, DIB_RGB_COLORS, (VOID**)&bits, NULL, 0);
+  HGDIOBJ oldhdc = reinterpret_cast<HBITMAP>(SelectObject(hdc, winBitmap));
+  DrawIconEx(hdc, 0, 0, icon, iconinfo.xHotspot * 2, iconinfo.yHotspot * 2, 0, 0, DI_NORMAL);
+
+  QImage image(w, h, QImage::Format_ARGB32_Premultiplied);
+  if (image.isNull())
+    return {};
+
+  BITMAPINFO bmi = GetBMI(w, h, true);
+
+  QScopedArrayPointer<uchar> data(new uchar[bmi.bmiHeader.biSizeImage]);
+  if (!GetDIBits(hdc, winBitmap, 0, h, data.data(), &bmi, DIB_RGB_COLORS))
+    return {};
+
+  for (int y = 0; y < image.height(); ++y)
+  {
+    void* dest = static_cast<void*>(image.scanLine(y));
+    const void* src = data.data() + y * image.bytesPerLine();
+    memcpy(dest, src, image.bytesPerLine());
+  }
+
+  // dispose resources created by iconinfo call
+  DeleteObject(iconinfo.hbmMask);
+  DeleteObject(iconinfo.hbmColor);
+  SelectObject(hdc, oldhdc);  // restore state
+  DeleteObject(winBitmap);
+  DeleteDC(hdc);
+  return QPixmap::fromImage(image);
+}
+
+QIcon WinIconHelper::GetNativeIcon()
+{
+  QIcon icon;
+  for (int size : {16, 32, 48, 256})
+  {
+    HANDLE h = LoadImageW(GetModuleHandleW(nullptr), L"\"DOLPHIN\"", IMAGE_ICON, size, size,
+                          LR_CREATEDIBSECTION);
+
+    if (h && h != INVALID_HANDLE_VALUE)
+    {
+      auto* icon_handle = static_cast<HICON>(h);
+      icon.addPixmap(PixmapFromHICON(icon_handle));
+    }
+  }
+
+  return icon;
+}
+
+#endif

Source/Core/DolphinQt2/QtUtils/WinIconHelper.h

@@ -0,0 +1,16 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#ifdef _WIN32
+
+#include <QIcon>
+
+namespace WinIconHelper
+{
+QIcon GetNativeIcon();
+};
+
+#endif

Source/Core/DolphinQt2/Resources.cpp

@@ -14,6 +14,10 @@
 #include "DolphinQt2/Resources.h"
 #include "DolphinQt2/Settings.h"
 
+#ifdef _WIN32
+#include "DolphinQt2/QtUtils/WinIconHelper.h"
+#endif
+
 QList<QPixmap> Resources::m_platforms;
 QList<QPixmap> Resources::m_countries;
 QList<QPixmap> Resources::m_ratings;
@@ -128,3 +132,17 @@ QPixmap Resources::GetMisc(int id)
 {
   return m_misc[id];
 }
+
+QIcon Resources::GetAppIcon()
+{
+  QIcon icon;
+
+#ifdef _WIN32
+  icon = WinIconHelper::GetNativeIcon();
+#else
+  icon.addPixmap(GetScaledPixmap("dolphin_logo"));
+  icon.addPixmap(GetScaledPixmap("Dolphin"));
+#endif
+
+  return icon;
+}

Source/Core/DolphinQt2/Resources.h

@@ -28,6 +28,7 @@ public:
 
   static QIcon GetScaledIcon(const std::string& name);
   static QIcon GetScaledThemeIcon(const std::string& name);
+  static QIcon GetAppIcon();
 
   static QPixmap GetScaledPixmap(const std::string& name);
   static QPixmap GetScaledThemePixmap(const std::string& name);