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// **************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl.html *
// * Copyright (C) ZenJu (zhnmju123 AT gmx DOT de) - All Rights Reserved *
// **************************************************************************
#include "thumbnail.h"
#include <string>
#define WIN32_LEAN_AND_MEAN
#include <zen/win.h>
#define STRICT_TYPED_ITEMIDS //better type safety for IDLists
#include <Shlobj.h>
#include <Shellapi.h>
#include <CommonControls.h>
#include <zen/com_ptr.h>
#include <zen/string_tools.h>
#include <zen/scope_guard.h>
using namespace zen;
thumb::HICON thumb::getThumbnail(const wchar_t* filename, int requestedSize) //return 0 on failure, caller takes ownership!
{
const std::wstring filenameStr(filename);
ComPtr<IShellFolder> desktopFolder;
{
HRESULT hr = ::SHGetDesktopFolder(desktopFolder.init());
if (FAILED(hr) || !desktopFolder)
return nullptr;
}
PIDLIST_RELATIVE pidlFolder = nullptr;
{
const std::wstring& pathName = beforeLast(filenameStr, L'\\');
HRESULT hr = desktopFolder->ParseDisplayName(nullptr, // [in] HWND hwnd,
nullptr, // [in] IBindCtx *pbc,
const_cast<LPWSTR>(pathName.c_str()), // [in] LPWSTR pszDisplayName,
nullptr, // [out] ULONG *pchEaten,
&pidlFolder, // [out] PIDLIST_RELATIVE* ppidl,
nullptr); // [in, out] ULONG *pdwAttributes
if (FAILED(hr) || !pidlFolder)
return nullptr;
}
ZEN_ON_SCOPE_EXIT(::ILFree(pidlFolder)); //older version: ::CoTaskMemFree
ComPtr<IShellFolder> imageFolder;
{
HRESULT hr = desktopFolder->BindToObject(pidlFolder, // [in] PCUIDLIST_RELATIVE pidl,
nullptr, // [in] IBindCtx *pbc,
IID_PPV_ARGS(imageFolder.init()));
if (FAILED(hr) || !imageFolder)
return nullptr;
}
PIDLIST_RELATIVE pidImage = nullptr;
{
const std::wstring& shortName = afterLast(filenameStr, L'\\');
HRESULT hr = imageFolder->ParseDisplayName(nullptr, // [in] HWND hwnd,
nullptr, // [in] IBindCtx *pbc,
const_cast<LPWSTR>(shortName.c_str()), // [in] LPWSTR pszDisplayName,
nullptr, // [out] ULONG *pchEaten,
&pidImage, // [out] PIDLIST_RELATIVE *ppidl,
nullptr); // [in, out] ULONG *pdwAttributes
if (FAILED(hr) || !pidImage)
return nullptr;
}
ZEN_ON_SCOPE_EXIT(::ILFree(pidImage)); //older version: ::CoTaskMemFree
ComPtr<IExtractImage> extractImage;
{
PCUITEMID_CHILD_ARRAY pidlIn = reinterpret_cast<PCUITEMID_CHILD_ARRAY>(&pidImage);
//this is where STRICT_TYPED_ITEMIDS gets us ;)
HRESULT hr = imageFolder->GetUIObjectOf(nullptr, // [in] HWND hwndOwner,
1, // [in] UINT cidl,
pidlIn, // [in] PCUITEMID_CHILD_ARRAY apidl,
IID_IExtractImage, // [in] REFIID riid,
nullptr, // [in, out] UINT *rgfReserved,
reinterpret_cast<void**>(extractImage.init())); // [out] void **ppv
if (FAILED(hr) || !extractImage)
return nullptr;
}
{
wchar_t pathBuffer[MAX_PATH];
DWORD priority = 0;
const SIZE prgSize = { requestedSize, requestedSize }; //preferred size only!
DWORD clrDepth = 32;
DWORD flags = IEIFLAG_SCREEN | IEIFLAG_OFFLINE;
HRESULT hr = extractImage->GetLocation(pathBuffer, // [out] LPWSTR pszPathBuffer,
MAX_PATH, // [in] DWORD cchMax,
&priority, // [out] DWORD *pdwPriority,
&prgSize, // [in] const SIZE *prgSize,
clrDepth, // [in] DWORD dwRecClrDepth,
&flags); // [in, out] DWORD *pdwFlags
if (FAILED(hr))
return nullptr;
}
HBITMAP bitmap = nullptr;
{
HRESULT hr = extractImage->Extract(&bitmap);
if (FAILED(hr) || !bitmap)
return nullptr;
}
ZEN_ON_SCOPE_EXIT(::DeleteObject(bitmap));
BITMAP bmpInfo = {};
if (::GetObject(bitmap, //__in HGDIOBJ hgdiobj,
sizeof(bmpInfo), //__in int cbBuffer,
&bmpInfo) == 0) //__out LPVOID lpvObject
return nullptr;
HBITMAP bitmapMask = ::CreateCompatibleBitmap(::GetDC(nullptr), bmpInfo.bmWidth, bmpInfo.bmHeight);
if (bitmapMask == 0)
return nullptr;
ZEN_ON_SCOPE_EXIT(::DeleteObject(bitmapMask));
ICONINFO iconInfo = {};
iconInfo.fIcon = true;
iconInfo.hbmColor = bitmap;
iconInfo.hbmMask = bitmapMask;
return ::CreateIconIndirect(&iconInfo);
}
thumb::HICON thumb::getIconByIndex(int iconIndex, int shilIconType) //return 0 on failure, caller takes ownership!
{
//Note: using IExtractIcon::Extract is *no* alternative, just as ::SHGetFileInfo(), it only supports small (16x16) and large (32x32) icons
ComPtr<IImageList> imageList; //perf: 0,12 µs only to get the image list
{
HRESULT hr = ::SHGetImageList(shilIconType, //__in int iImageList,
IID_PPV_ARGS(imageList.init()));
if (FAILED(hr) || !imageList)
return nullptr;
}
bool hasAlpha = false; //perf: 0,14 µs
{
DWORD flags = 0;
HRESULT hr = imageList->GetItemFlags(iconIndex, //[in] int i,
&flags); //[out] DWORD *dwFlags
if (SUCCEEDED(hr))
hasAlpha = flags & ILIF_ALPHA;
}
::HICON hIcon = nullptr; //perf: 1,5 ms - the dominant block
{
HRESULT hr = imageList->GetIcon(iconIndex, // [in] int i,
hasAlpha ? ILD_IMAGE : ILD_NORMAL, // [in] UINT flags,
//ILD_IMAGE -> do not draw mask - fixes glitch with ILD_NORMAL where both mask *and* alpha channel are applied, e.g. for ffs_batch and folder icon
//other flags: http://msdn.microsoft.com/en-us/library/windows/desktop/bb775230(v=vs.85).aspx
&hIcon); // [out] HICON *picon
if (FAILED(hr) || !hIcon)
return nullptr;
}
return hIcon;
}
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