AeroGlass.cpp

// sktoolslib - common files for SK tools

// Copyright (C) 2012, 2017, 2020-2021 - Stefan Kueng

// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software Foundation,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//

#include "stdafx.h"
#include "AeroGlass.h"

#include <VersionHelpers.h>
#include <vssym32.h>
// SDKs prior to Win10 don't have the IsWindows10OrGreater API in the versionhelpers header, so
// we define it here just in case:
#ifndef _WIN32_WINNT_WIN10
#    define _WIN32_WINNT_WIN10        0x0A00
#    define _WIN32_WINNT_WINTHRESHOLD 0x0A00
#    define IsWindows10OrGreater()    (IsWindowsVersionOrGreater(HIBYTE(_WIN32_WINNT_WIN10), LOBYTE(_WIN32_WINNT_WIN10), 0))
#endif

using DWM_EXTEND_FRAME_INTO_CLIENT_AREA = HRESULT(__stdcall* )(HWND, const MARGINS*);
using DWM_IS_COMPOSITION_ENABLED = HRESULT(__stdcall* )(BOOL* pfEnabled);
using DWM_ENABLE_COMPOSITION = HRESULT(__stdcall* )(UINT uCompositionAction);

CDwmApiImpl::CDwmApiImpl()
    : m_hDwmApiLib(nullptr)
{
}

BOOL CDwmApiImpl::Initialize()
{
    if (m_hDwmApiLib)
    {
        SetLastError(ERROR_ALREADY_INITIALIZED);
        return FALSE;
    }

    m_hDwmApiLib = LoadLibraryW(L"dwmapi.dll");
    return IsInitialized();
}

BOOL CDwmApiImpl::IsInitialized() const
{
    return (nullptr != m_hDwmApiLib);
}

CDwmApiImpl::~CDwmApiImpl()
{
    if (IsInitialized())
    {
        FreeLibrary(m_hDwmApiLib);
        m_hDwmApiLib = nullptr;
    }
}

HRESULT CDwmApiImpl::DwmExtendFrameIntoClientArea(HWND hWnd, const MARGINS* pMarInset) const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }
    if (!IsDwmCompositionEnabled())
        return OLE_E_BLANK;
    DWM_EXTEND_FRAME_INTO_CLIENT_AREA pfnDwmExtendFrameIntoClientArea = reinterpret_cast<DWM_EXTEND_FRAME_INTO_CLIENT_AREA>(GetProcAddress(m_hDwmApiLib, "DwmExtendFrameIntoClientArea"));
    if (!pfnDwmExtendFrameIntoClientArea)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnDwmExtendFrameIntoClientArea(hWnd, pMarInset);
}

BOOL CDwmApiImpl::IsDwmCompositionEnabled() const
{
    if (!IsInitialized())
    {
        SetLastError(static_cast<DWORD>(OLE_E_BLANK));
        return FALSE;
    }
    // disable aero dialogs in high contrast mode and on Windows 10:
    // in high contrast mode, while DWM is still active, the aero effect is not
    // in Win 10, the dialog title bar is not rendered transparent, so the dialogs would
    // look really ugly and not symmetric.
    HIGHCONTRAST hc = {sizeof(HIGHCONTRAST)};
    SystemParametersInfo(SPI_GETHIGHCONTRAST, sizeof(HIGHCONTRAST), &hc, FALSE);
    DWM_IS_COMPOSITION_ENABLED pfnDwmIsCompositionEnabled = reinterpret_cast<DWM_IS_COMPOSITION_ENABLED>(GetProcAddress(m_hDwmApiLib, "DwmIsCompositionEnabled"));
    if (!pfnDwmIsCompositionEnabled)
        return FALSE;
    BOOL    bEnabled = FALSE;
    HRESULT hRes     = pfnDwmIsCompositionEnabled(&bEnabled);
    return SUCCEEDED(hRes) && bEnabled && ((hc.dwFlags & HCF_HIGHCONTRASTON) == 0) && !IsWindows10OrGreater();
}

HRESULT CDwmApiImpl::DwmEnableComposition(UINT uCompositionAction) const
{
    if (!IsInitialized())
    {
        SetLastError(static_cast<DWORD>(OLE_E_BLANK));
        return S_FALSE;
    }
    DWM_ENABLE_COMPOSITION pfnDwmEnableComposition = reinterpret_cast<DWM_ENABLE_COMPOSITION>(GetProcAddress(m_hDwmApiLib, "DwmEnableComposition"));
    if (!pfnDwmEnableComposition)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnDwmEnableComposition(uCompositionAction);
}

CUxThemeAeroImpl::CUxThemeAeroImpl()
    : m_hUxThemeLib(nullptr)
{
}

BOOL CUxThemeAeroImpl::Initialize()
{
    if (m_hUxThemeLib)
    {
        SetLastError(ERROR_ALREADY_INITIALIZED);
        return FALSE;
    }

    m_hUxThemeLib = LoadLibraryW(L"uxtheme.dll");
    return IsInitialized();
}

using BUFFERED_PAINT_INIT = HRESULT(__stdcall* )();
using OPEN_THEME_DATA = HTHEME(__stdcall* )(HWND hwnd, LPCWSTR pszClassList);
using CLOSE_THEME_DATA = HRESULT(__stdcall* )(HTHEME hTheme);
using BEGIN_BUFFERED_PAINT = HPAINTBUFFER(__stdcall* )(HDC hdcTarget, const RECT* prcTarget, BP_BUFFERFORMAT dwFormat, BP_PAINTPARAMS* pPaintParams, HDC* phdc);
using END_BUFFERED_PAINT = HRESULT(__stdcall* )(HPAINTBUFFER hBufferedPaint, BOOL fUpdateTarget);
using DRAW_THEME_TEXT_EX = HRESULT(__stdcall* )(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, LPCWSTR pszText, int cchText, DWORD dwTextFlags, LPRECT pRect, const DTTOPTS* pOptions);
using GET_THEME_INT = HRESULT(__stdcall* )(HTHEME hTheme, int iPartId, int iStateId, int iPropId, int* piVal);
using GET_THEME_SYS_FONT = HRESULT(__stdcall* )(HTHEME hTheme, int iFontId, LOGFONTW* plf);
using BUFFERED_PAINT_SET_ALPHA = HRESULT(__stdcall* )(HPAINTBUFFER hBufferedPaint, const RECT* prc, BYTE alpha);
using DRAW_THEME_BACKGROUND = HRESULT(__stdcall* )(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, const RECT* pRect, const RECT* pClipRect);
using GET_THEME_BKG_CONTENT_RECT = HRESULT(__stdcall* )(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, LPCRECT pBoundingRect, LPRECT pContentRect);
using GET_THEME_BKG_CONTENT_EXTENT = HRESULT(__stdcall* )(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, LPCRECT pContentRect, LPRECT pExtentRect);
using GET_THEME_BITMAP = HRESULT(__stdcall* )(HTHEME hTheme, int iPartId, int iStateId, int iPropId, ULONG dwFlags, HBITMAP* phBitmap);
using DRAW_THEME_PARENT_BACKGROUND = HRESULT(__stdcall* )(HWND hwnd, HDC hdc, const RECT* prc);
using IS_THEME_BACKGROUND_PARTIALLY_TRANSPARENT = BOOL(__stdcall* )(HTHEME hTheme, int iPartId, int iStateId);
using DRAW_THEME_TEXT = HRESULT(__stdcall* )(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, LPCWSTR pszText, int iCharCount, DWORD dwTextFlags, DWORD dwTextFlags2, LPCRECT pRect);
using GET_THEME_COLOR = HRESULT(__stdcall* )(HTHEME hTheme, int iPartId, int iStateId, int iPropId, COLORREF* pColor);
using GET_THEME_PART_SIZE = HRESULT(__stdcall* )(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, LPCRECT prc, THEMESIZE eSize, SIZE* psz);
using GET_THEME_POSITION = HRESULT(__stdcall* )(HTHEME hTheme, int iPartId, int iStateId, int iPropId, POINT* pPoint);
using GET_THEME_MARGINS = HRESULT(__stdcall* )(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, int iPropId, LPRECT prc, MARGINS* pMargins);
using GET_THEME_METRIC = HRESULT(__stdcall* )(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, int iPropId, int* piVal);
using GET_THEME_RECT = HRESULT(__stdcall* )(HTHEME hTheme, int iPartId, int iStateId, int iPropId, LPRECT pRect);

BOOL CUxThemeAeroImpl::IsInitialized() const
{
    return (nullptr != m_hUxThemeLib);
}

CUxThemeAeroImpl::~CUxThemeAeroImpl()
{
    if (IsInitialized())
    {
        FreeLibrary(m_hUxThemeLib);
        m_hUxThemeLib = nullptr;
    }
}

HRESULT CUxThemeAeroImpl::BufferedPaintInit() const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }
    BUFFERED_PAINT_INIT pfnBufferedPaintInit = reinterpret_cast<BUFFERED_PAINT_INIT>(GetProcAddress(m_hUxThemeLib, "BufferedPaintInit"));
    if (!pfnBufferedPaintInit)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnBufferedPaintInit();
}

HRESULT CUxThemeAeroImpl::BufferedPaintUnInit() const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }
    BUFFERED_PAINT_INIT pfnBufferedPaintUnInit = reinterpret_cast<BUFFERED_PAINT_INIT>(GetProcAddress(m_hUxThemeLib, "BufferedPaintUnInit"));
    if (!pfnBufferedPaintUnInit)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnBufferedPaintUnInit();
}

HTHEME CUxThemeAeroImpl::OpenThemeData(HWND hwnd, LPCWSTR pszClassList) const
{
    if (!IsInitialized())
    {
        SetLastError(static_cast<DWORD>(OLE_E_BLANK));
        return nullptr;
    }
    OPEN_THEME_DATA pfnOpenThemeData = reinterpret_cast<OPEN_THEME_DATA>(GetProcAddress(m_hUxThemeLib, "OpenThemeData"));
    if (!pfnOpenThemeData)
        return nullptr;

    return pfnOpenThemeData(hwnd, pszClassList);
}

HRESULT CUxThemeAeroImpl::CloseThemeData(HTHEME hTheme) const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }
    CLOSE_THEME_DATA pfnCloseThemeData = reinterpret_cast<CLOSE_THEME_DATA>(GetProcAddress(m_hUxThemeLib, "CloseThemeData"));
    if (!pfnCloseThemeData)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnCloseThemeData(hTheme);
}

HANDLE CUxThemeAeroImpl::BeginBufferedPaint(HDC hdcTarget, const RECT* prcTarget, BP_BUFFERFORMAT dwFormat, BP_PAINTPARAMS* pPaintParams, HDC* phdc) const
{
    if (!IsInitialized())
    {
        SetLastError(static_cast<DWORD>(OLE_E_BLANK));
        return nullptr;
    }
    BEGIN_BUFFERED_PAINT pfnBeginBufferedPaint = reinterpret_cast<BEGIN_BUFFERED_PAINT>(GetProcAddress(m_hUxThemeLib, "BeginBufferedPaint"));
    if (!pfnBeginBufferedPaint)
        return nullptr;

    return pfnBeginBufferedPaint(hdcTarget, prcTarget, dwFormat, pPaintParams, phdc);
}

HRESULT CUxThemeAeroImpl::EndBufferedPaint(HANDLE hBufferedPaint, BOOL fUpdateTarget) const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }
    END_BUFFERED_PAINT pfnEndBufferedPaint = reinterpret_cast<END_BUFFERED_PAINT>(GetProcAddress(m_hUxThemeLib, "EndBufferedPaint"));
    if (!pfnEndBufferedPaint)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnEndBufferedPaint(hBufferedPaint, fUpdateTarget);
}

HRESULT CUxThemeAeroImpl::DrawThemeTextEx(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, LPCWSTR pszText, int cchText, DWORD dwTextFlags, LPRECT pRect, const DTTOPTS* pOptions) const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }
    DRAW_THEME_TEXT_EX pfnDrawThemeTextEx = reinterpret_cast<DRAW_THEME_TEXT_EX>(GetProcAddress(m_hUxThemeLib, "DrawThemeTextEx"));
    if (!pfnDrawThemeTextEx)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnDrawThemeTextEx(hTheme, hdc, iPartId, iStateId, pszText, cchText, dwTextFlags, pRect, pOptions);
}

HRESULT CUxThemeAeroImpl::GetThemeInt(HTHEME hTheme, int iPartId, int iStateId, int iPropId, int* piVal) const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }
    GET_THEME_INT pfnGetThemeInt = reinterpret_cast<GET_THEME_INT>(GetProcAddress(m_hUxThemeLib, "GetThemeInt"));
    if (!pfnGetThemeInt)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnGetThemeInt(hTheme, iPartId, iStateId, iPropId, piVal);
}

HRESULT CUxThemeAeroImpl::GetThemeSysFont(HTHEME hTheme, int iFontId, LOGFONTW* plf) const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }
    GET_THEME_SYS_FONT pfnGetThemeSysFont = reinterpret_cast<GET_THEME_SYS_FONT>(GetProcAddress(m_hUxThemeLib, "GetThemeSysFont"));
    if (!pfnGetThemeSysFont)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnGetThemeSysFont(hTheme, iFontId, plf);
}

HRESULT CUxThemeAeroImpl::BufferedPaintSetAlpha(HPAINTBUFFER hBufferedPaint, const RECT* prc, BYTE alpha) const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }

    BUFFERED_PAINT_SET_ALPHA pfnBufferedPaintSetAlpha = reinterpret_cast<BUFFERED_PAINT_SET_ALPHA>(GetProcAddress(m_hUxThemeLib, "BufferedPaintSetAlpha"));
    if (!pfnBufferedPaintSetAlpha)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnBufferedPaintSetAlpha(hBufferedPaint, prc, alpha);
}

HRESULT CUxThemeAeroImpl::BufferedPaintMakeOpaque_(HPAINTBUFFER hBufferedPaint, const RECT* prc) const
{
    return BufferedPaintSetAlpha(hBufferedPaint, prc, 255);
}

HRESULT CUxThemeAeroImpl::DrawThemeBackground(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, const RECT* pRect, const RECT* pClipRect) const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }

    DRAW_THEME_BACKGROUND pfnDrawThemeBackground = reinterpret_cast<DRAW_THEME_BACKGROUND>(GetProcAddress(m_hUxThemeLib, "DrawThemeBackground"));
    if (!pfnDrawThemeBackground)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnDrawThemeBackground(hTheme, hdc, iPartId, iStateId, pRect, pClipRect);
}

HRESULT CUxThemeAeroImpl::GetThemeBackgroundContentRect(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, LPCRECT pBoundingRect, LPRECT pContentRect) const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }

    GET_THEME_BKG_CONTENT_RECT pfnGetThemeBackgroundContentRect = reinterpret_cast<GET_THEME_BKG_CONTENT_RECT>(GetProcAddress(m_hUxThemeLib, "GetThemeBackgroundContentRect"));
    if (!pfnGetThemeBackgroundContentRect)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnGetThemeBackgroundContentRect(hTheme, hdc, iPartId, iStateId, pBoundingRect, pContentRect);
}

HRESULT CUxThemeAeroImpl::GetThemeBackgroundExtent(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, LPCRECT pContentRect, LPRECT pExtentRect) const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }

    GET_THEME_BKG_CONTENT_EXTENT pfnGetThemeBackgroundExtent = reinterpret_cast<GET_THEME_BKG_CONTENT_EXTENT>(GetProcAddress(m_hUxThemeLib, "GetThemeBackgroundExtent"));
    if (!pfnGetThemeBackgroundExtent)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnGetThemeBackgroundExtent(hTheme, hdc, iPartId, iStateId, pContentRect, pExtentRect);
}

HRESULT CUxThemeAeroImpl::GetThemeBitmap(HTHEME hTheme, int iPartId, int iStateId, int iPropId, ULONG dwFlags, HBITMAP* phBitmap) const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }

    GET_THEME_BITMAP pfnGetThemeBitmap = reinterpret_cast<GET_THEME_BITMAP>(GetProcAddress(m_hUxThemeLib, "GetThemeBitmap"));
    if (!pfnGetThemeBitmap)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnGetThemeBitmap(hTheme, iPartId, iStateId, iPropId, dwFlags, phBitmap);
}

BOOL CUxThemeAeroImpl::DetermineGlowSize(int* piSize, LPCWSTR pszClassIdList /*= nullptr*/) const
{
    if (!piSize)
    {
        SetLastError(ERROR_INVALID_PARAMETER);
        return FALSE;
    }

    if (!pszClassIdList)
        pszClassIdList = L"CompositedWindow::Window";

    HTHEME hThemeWindow = OpenThemeData(nullptr, pszClassIdList);
    if (hThemeWindow != nullptr)
    {
        GetThemeInt(hThemeWindow, 0, 0, TMT_TEXTGLOWSIZE, piSize);
        CloseThemeData(hThemeWindow);
        return TRUE;
    }

    SetLastError(ERROR_FILE_NOT_FOUND);
    return FALSE;
}

HRESULT CUxThemeAeroImpl::DrawThemeParentBackground(HWND hwnd, HDC hdc, const RECT* prc) const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }

    DRAW_THEME_PARENT_BACKGROUND pfnDrawThemeParentBackground = reinterpret_cast<DRAW_THEME_PARENT_BACKGROUND>(GetProcAddress(m_hUxThemeLib, "DrawThemeParentBackground"));
    if (!pfnDrawThemeParentBackground)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnDrawThemeParentBackground(hwnd, hdc, prc);
}

BOOL CUxThemeAeroImpl::IsThemeBackgroundPartiallyTransparent(HTHEME hTheme, int iPartId, int iStateId) const
{
    if (!IsInitialized())
    {
        return FALSE;
    }

    IS_THEME_BACKGROUND_PARTIALLY_TRANSPARENT pfnIsThemeBackgroundPartiallyTransparent = reinterpret_cast<IS_THEME_BACKGROUND_PARTIALLY_TRANSPARENT>(GetProcAddress(m_hUxThemeLib, "IsThemeBackgroundPartiallyTransparent"));
    if (!pfnIsThemeBackgroundPartiallyTransparent)
        return FALSE;

    return pfnIsThemeBackgroundPartiallyTransparent(hTheme, iPartId, iStateId);
}

HRESULT CUxThemeAeroImpl::DrawThemeText(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, LPCWSTR pszText, int iCharCount, DWORD dwTextFlags, DWORD dwTextFlags2, LPCRECT pRect) const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }

    DRAW_THEME_TEXT pfnDrawThemeText = reinterpret_cast<DRAW_THEME_TEXT>(GetProcAddress(m_hUxThemeLib, "DrawThemeText"));
    if (!pfnDrawThemeText)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnDrawThemeText(hTheme, hdc, iPartId, iStateId, pszText, iCharCount, dwTextFlags, dwTextFlags2, pRect);
}

HRESULT CUxThemeAeroImpl::GetThemeColor(HTHEME hTheme, int iPartId, int iStateId, int iPropId, COLORREF* pColor) const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }

    GET_THEME_COLOR pfnGetThemeColor = reinterpret_cast<GET_THEME_COLOR>(GetProcAddress(m_hUxThemeLib, "GetThemeColor"));
    if (!pfnGetThemeColor)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnGetThemeColor(hTheme, iPartId, iStateId, iPropId, pColor);
}

HRESULT CUxThemeAeroImpl::GetThemePartSize(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, LPCRECT prc, THEMESIZE eSize, SIZE* psz) const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }

    GET_THEME_PART_SIZE pfnGetThemePartSize = reinterpret_cast<GET_THEME_PART_SIZE>(GetProcAddress(m_hUxThemeLib, "GetThemePartSize"));
    if (!pfnGetThemePartSize)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnGetThemePartSize(hTheme, hdc, iPartId, iStateId, prc, eSize, psz);
}

HRESULT CUxThemeAeroImpl::GetThemePosition(HTHEME hTheme, int iPartId, int iStateId, int iPropId, POINT* pPoint) const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }

    GET_THEME_POSITION pfnGetThemePosition = reinterpret_cast<GET_THEME_POSITION>(GetProcAddress(m_hUxThemeLib, "GetThemePosition"));
    if (!pfnGetThemePosition)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnGetThemePosition(hTheme, iPartId, iStateId, iPropId, pPoint);
}

HRESULT CUxThemeAeroImpl::GetThemeMargins(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, int iPropId, LPRECT prc, MARGINS* pMargins) const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }

    GET_THEME_MARGINS pfnGetThemeMargins = reinterpret_cast<GET_THEME_MARGINS>(GetProcAddress(m_hUxThemeLib, "GetThemeMargins"));
    if (!pfnGetThemeMargins)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnGetThemeMargins(hTheme, hdc, iPartId, iStateId, iPropId, prc, pMargins);
}

HRESULT CUxThemeAeroImpl::GetThemeMetric(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, int iPropId, int* piVal) const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }

    GET_THEME_METRIC pfnGetThemeMetric = reinterpret_cast<GET_THEME_METRIC>(GetProcAddress(m_hUxThemeLib, "GetThemeMetric"));
    if (!pfnGetThemeMetric)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnGetThemeMetric(hTheme, hdc, iPartId, iStateId, iPropId, piVal);
}

HRESULT CUxThemeAeroImpl::GetThemeRect(HTHEME hTheme, int iPartId, int iStateId, int iPropId, LPRECT pRect) const
{
    if (!IsInitialized())
    {
        return OLE_E_BLANK;
    }

    GET_THEME_RECT pfnGetThemeRect = reinterpret_cast<GET_THEME_RECT>(GetProcAddress(m_hUxThemeLib, "GetThemeRect"));
    if (!pfnGetThemeRect)
        return HRESULT_FROM_WIN32(GetLastError());

    return pfnGetThemeRect(hTheme, iPartId, iStateId, iPropId, pRect);
}