Shifted three functions to common (#1101)

src/common/icon_helpers.cpp

@@ -0,0 +1,90 @@
+#include "icon_helpers.h"
+#include "pch.h"
+
+HRESULT GetIconIndexFromPath(_In_ PCWSTR path, _Out_ int* index)
+{
+    *index = 0;
+
+    HRESULT hr = E_FAIL;
+
+    SHFILEINFO shFileInfo = { 0 };
+
+    if (!PathIsRelative(path))
+    {
+        DWORD attrib = GetFileAttributes(path);
+        HIMAGELIST himl = (HIMAGELIST)SHGetFileInfo(path, attrib, &shFileInfo, sizeof(shFileInfo), (SHGFI_SYSICONINDEX | SHGFI_SMALLICON | SHGFI_USEFILEATTRIBUTES));
+        if (himl)
+        {
+            *index = shFileInfo.iIcon;
+            // We shouldn't free the HIMAGELIST.
+            hr = S_OK;
+        }
+    }
+
+    return hr;
+}
+
+HBITMAP CreateBitmapFromIcon(_In_ HICON hIcon, _In_opt_ UINT width, _In_opt_ UINT height)
+{
+    HBITMAP hBitmapResult = NULL;
+
+    // Create compatible DC
+    HDC hDC = CreateCompatibleDC(NULL);
+    if (hDC != NULL)
+    {
+        // Get bitmap rectangle size
+        RECT rc = { 0 };
+        rc.left = 0;
+        rc.right = (width != 0) ? width : GetSystemMetrics(SM_CXSMICON);
+        rc.top = 0;
+        rc.bottom = (height != 0) ? height : GetSystemMetrics(SM_CYSMICON);
+
+        // Create bitmap compatible with DC
+        BITMAPINFO BitmapInfo;
+        ZeroMemory(&BitmapInfo, sizeof(BITMAPINFO));
+
+        BitmapInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
+        BitmapInfo.bmiHeader.biWidth = rc.right;
+        BitmapInfo.bmiHeader.biHeight = rc.bottom;
+        BitmapInfo.bmiHeader.biPlanes = 1;
+        BitmapInfo.bmiHeader.biBitCount = 32;
+        BitmapInfo.bmiHeader.biCompression = BI_RGB;
+
+        HDC hDCBitmap = GetDC(NULL);
+
+        HBITMAP hBitmap = CreateDIBSection(hDCBitmap, &BitmapInfo, DIB_RGB_COLORS, NULL, NULL, 0);
+
+        ReleaseDC(NULL, hDCBitmap);
+
+        if (hBitmap != NULL)
+        {
+            // Select bitmap into DC
+            HBITMAP hBitmapOld = (HBITMAP)SelectObject(hDC, hBitmap);
+            if (hBitmapOld != NULL)
+            {
+                // Draw icon into DC
+                if (DrawIconEx(hDC, 0, 0, hIcon, rc.right, rc.bottom, 0, NULL, DI_NORMAL))
+                {
+                    // Restore original bitmap in DC
+                    hBitmapResult = (HBITMAP)SelectObject(hDC, hBitmapOld);
+                    hBitmapOld = NULL;
+                    hBitmap = NULL;
+                }
+
+                if (hBitmapOld != NULL)
+                {
+                    SelectObject(hDC, hBitmapOld);
+                }
+            }
+
+            if (hBitmap != NULL)
+            {
+                DeleteObject(hBitmap);
+            }
+        }
+
+        DeleteDC(hDC);
+    }
+
+    return hBitmapResult;
+}