[PATCH 0/1] MR7344: winex11: Fix alpha blending in X11DRV_UpdateLayeredWindow.

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Dmitry Timoshkov (＠dmitry)

17 Feb 2025 17 Feb '25

7:41 a.m.

Original patch description https://www.winehq.org/pipermail/wine-patches/2017-February/157574.html

winehq.org no longer provides the wine-patches archives, so it's necessary to dig into [web.archive.org](https://web.archive.org/web/20211011014926/https://www.winehq.org/pipermail/...):

https://web.archive.org/web/20211011014926/https://www.winehq.org/pipermail/...

https://web.archive.org/web/20211011014930/https://www.winehq.org/pipermail/...

===================================================================

Based on a patch by Dmitry Timoshkov.

## Signed-off-by: Sebastian Lackner sebastian@fds-team.de

Fixes https://bugs.winehq.org/show_bug.cgi?id=33943.

Battle.Net initially creates completely transparent popup windows and afterwards uses UpdateLayeredWindow without hdcSrc to let them fade in. Testing confirms that this works fine on Windows - on Wine however the original content is lost and no longer available. To avoid that, this patch stores the original content in the surface and uses _NET_WM_WINDOW_OPACITY to create a transparency effect. The same method is already used by SetLayeredWindowAttributes. If compositing is disabled, the window content will be visible immediately.

Dmitrys original patch used a different approach, and manually implemented the alpha blending in x11drv_surface_flush using additional buffers, however this shouldn't really be necessary (yet). We can still use it later if there is any benefit compared to using _NET_WM_WINDOW_OPACITY.

-- https://gitlab.winehq.org/wine/wine/-/merge_requests/7344

Show replies by date

Sebastian Lackner

17 Feb 17 Feb

7:41 a.m.

New subject: [PATCH 1/1] winex11: Fix alpha blending in X11DRV_UpdateLayeredWindow.

From: Sebastian Lackner sebastian@fds-team.de

Based on a patch by Dmitry Timoshkov.

Signed-off-by: Dmitry Timoshkov dmitry@baikal.ru --- dlls/win32u/driver.c | 6 +++--- dlls/win32u/window.c | 9 ++++++--- dlls/winemac.drv/macdrv.h | 2 +- dlls/winemac.drv/window.c | 2 +- dlls/winex11.drv/window.c | 23 +++++++++++++---------- dlls/winex11.drv/x11drv.h | 2 +- include/wine/gdi_driver.h | 2 +- 7 files changed, 26 insertions(+), 20 deletions(-)

diff --git a/dlls/win32u/driver.c b/dlls/win32u/driver.c index 22e48fa6782..acc319d6a77 100644 --- a/dlls/win32u/driver.c +++ b/dlls/win32u/driver.c @@ -862,7 +862,7 @@ static LRESULT nulldrv_SysCommand( HWND hwnd, WPARAM wparam, LPARAM lparam, cons return -1; }

-static void nulldrv_UpdateLayeredWindow( HWND hwnd, UINT flags ) +static void nulldrv_UpdateLayeredWindow( HWND hwnd, const BLENDFUNCTION *blend, UINT flags ) { }

@@ -1221,9 +1221,9 @@ static void loaderdrv_SetWindowRgn( HWND hwnd, HRGN hrgn, BOOL redraw ) load_driver()->pSetWindowRgn( hwnd, hrgn, redraw ); }

-static void loaderdrv_UpdateLayeredWindow( HWND hwnd, UINT flags ) +static void loaderdrv_UpdateLayeredWindow( HWND hwnd, const BLENDFUNCTION *blend, UINT flags ) { - load_driver()->pUpdateLayeredWindow( hwnd, flags ); + load_driver()->pUpdateLayeredWindow( hwnd, blend, flags ); }

static UINT loaderdrv_VulkanInit( UINT version, void *vulkan_handle, const struct vulkan_driver_funcs **driver_funcs ) diff --git a/dlls/win32u/window.c b/dlls/win32u/window.c index 1cea6d25a4b..717e8ef62dd 100644 --- a/dlls/win32u/window.c +++ b/dlls/win32u/window.c @@ -2481,7 +2481,11 @@ BOOL WINAPI NtUserUpdateLayeredWindow( HWND hwnd, HDC hdc_dst, const POINT *pts_ apply_window_pos( hwnd, 0, swp_flags, surface, &new_rects, NULL ); if (!surface) return FALSE;

- if (!hdc_src || surface == &dummy_surface) ret = TRUE; + if (!hdc_src || surface == &dummy_surface) + { + user_driver->pUpdateLayeredWindow( hwnd, blend, flags ); + ret = TRUE; + } else { BLENDFUNCTION src_blend = { AC_SRC_OVER, 0, 255, 0 }; @@ -2502,7 +2506,6 @@ BOOL WINAPI NtUserUpdateLayeredWindow( HWND hwnd, HDC hdc_dst, const POINT *pts_ if (pts_src) OffsetRect( &src_rect, pts_src->x, pts_src->y ); NtGdiTransformPoints( hdc_src, (POINT *)&src_rect, (POINT *)&src_rect, 2, NtGdiDPtoLP );

- if (flags & ULW_ALPHA) src_blend = *blend; ret = NtGdiAlphaBlend( hdc, rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, hdc_src, src_rect.left, src_rect.top, src_rect.right - src_rect.left, src_rect.bottom - src_rect.top, *(DWORD *)&src_blend, 0 ); @@ -2514,7 +2517,7 @@ BOOL WINAPI NtUserUpdateLayeredWindow( HWND hwnd, HDC hdc_dst, const POINT *pts_ if (!(flags & ULW_COLORKEY)) key = CLR_INVALID; window_surface_set_layered( surface, key, -1, 0xff000000 );

- user_driver->pUpdateLayeredWindow( hwnd, flags ); + user_driver->pUpdateLayeredWindow( hwnd, blend, flags ); window_surface_flush( surface ); }

diff --git a/dlls/winemac.drv/macdrv.h b/dlls/winemac.drv/macdrv.h index 4457a7e186c..c4bc05c1566 100644 --- a/dlls/winemac.drv/macdrv.h +++ b/dlls/winemac.drv/macdrv.h @@ -145,7 +145,7 @@ extern void macdrv_SetLayeredWindowAttributes(HWND hwnd, COLORREF key, BYTE alph extern void macdrv_SetWindowText(HWND hwnd, LPCWSTR text); extern UINT macdrv_ShowWindow(HWND hwnd, INT cmd, RECT *rect, UINT swp); extern LRESULT macdrv_SysCommand(HWND hwnd, WPARAM wparam, LPARAM lparam, const POINT *pos); -extern void macdrv_UpdateLayeredWindow(HWND hwnd, UINT flags); +extern void macdrv_UpdateLayeredWindow(HWND hwnd, const BLENDFUNCTION *blend, UINT flags); extern LRESULT macdrv_WindowMessage(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp); extern BOOL macdrv_WindowPosChanging(HWND hwnd, UINT swp_flags, BOOL shaped, const struct window_rects *rects); extern BOOL macdrv_GetWindowStyleMasks(HWND hwnd, UINT style, UINT ex_style, UINT *style_mask, UINT *ex_style_mask); diff --git a/dlls/winemac.drv/window.c b/dlls/winemac.drv/window.c index 115820ec376..28a5d89fcad 100644 --- a/dlls/winemac.drv/window.c +++ b/dlls/winemac.drv/window.c @@ -1627,7 +1627,7 @@ done: /*********************************************************************** * UpdateLayeredWindow (MACDRV.@) */ -void macdrv_UpdateLayeredWindow(HWND hwnd, UINT flags) +void macdrv_UpdateLayeredWindow(HWND hwnd, const BLENDFUNCTION *blend, UINT flags) { struct macdrv_win_data *data;

diff --git a/dlls/winex11.drv/window.c b/dlls/winex11.drv/window.c index 7ae1d8ef66a..3d254b78fa6 100644 --- a/dlls/winex11.drv/window.c +++ b/dlls/winex11.drv/window.c @@ -573,13 +573,11 @@ static void sync_window_region( struct x11drv_win_data *data, HRGN win_region )

/*********************************************************************** - * sync_window_opacity + * set_window_opacity */ -static void sync_window_opacity( Display *display, Window win, BYTE alpha, DWORD flags ) +static void set_window_opacity( Display *display, Window win, BYTE alpha ) { - unsigned long opacity = 0xffffffff; - - if (flags & LWA_ALPHA) opacity = (0xffffffff / 0xff) * alpha; + unsigned long opacity = (0xffffffff / 0xff) * alpha;

if (opacity == 0xffffffff) XDeleteProperty( display, win, x11drv_atom(_NET_WM_WINDOW_OPACITY) ); @@ -2160,7 +2158,7 @@ static void create_whole_window( struct x11drv_win_data *data )

/* set the window opacity */ if (!NtUserGetLayeredWindowAttributes( data->hwnd, &key, &alpha, &layered_flags )) layered_flags = 0; - sync_window_opacity( data->display, data->whole_window, alpha, layered_flags ); + set_window_opacity( data->display, data->whole_window, (layered_flags & LWA_ALPHA) ? alpha : 0xff );

XFlush( data->display ); /* make sure the window exists before we start painting to it */

@@ -2288,7 +2286,7 @@ void X11DRV_SetWindowStyle( HWND hwnd, INT offset, STYLESTRUCT *style ) { data->layered = FALSE; set_window_visual( data, &default_visual, FALSE ); - sync_window_opacity( data->display, data->whole_window, 0, 0 ); + set_window_opacity( data->display, data->whole_window, 0xff ); } done: release_win_data( data ); @@ -3168,7 +3166,7 @@ void X11DRV_SetLayeredWindowAttributes( HWND hwnd, COLORREF key, BYTE alpha, DWO set_window_visual( data, &default_visual, FALSE );

if (data->whole_window) - sync_window_opacity( data->display, data->whole_window, alpha, flags ); + set_window_opacity( data->display, data->whole_window, (flags & LWA_ALPHA) ? alpha : 0xff );

data->layered = TRUE; if (data->desired_state.wm_state == WithdrawnState) /* mapping is delayed until attributes are set */ @@ -3190,7 +3188,7 @@ void X11DRV_SetLayeredWindowAttributes( HWND hwnd, COLORREF key, BYTE alpha, DWO Window win = X11DRV_get_whole_window( hwnd ); if (win) { - sync_window_opacity( gdi_display, win, alpha, flags ); + set_window_opacity( gdi_display, win, (flags & LWA_ALPHA) ? alpha : 0xff ); if (flags & LWA_COLORKEY) FIXME( "LWA_COLORKEY not supported on foreign process window %p\n", hwnd ); } @@ -3201,12 +3199,17 @@ void X11DRV_SetLayeredWindowAttributes( HWND hwnd, COLORREF key, BYTE alpha, DWO /*********************************************************************** * UpdateLayeredWindow (X11DRV.@) */ -void X11DRV_UpdateLayeredWindow( HWND hwnd, UINT flags ) +void X11DRV_UpdateLayeredWindow( HWND hwnd, const BLENDFUNCTION *blend, UINT flags ) { struct x11drv_win_data *data; BOOL mapped;

if (!(data = get_win_data( hwnd ))) return; + + if (data->whole_window) + set_window_opacity( data->display, data->whole_window, + (flags & ULW_ALPHA) ? blend->SourceConstantAlpha : 0xff ); + mapped = data->desired_state.wm_state != WithdrawnState; release_win_data( data );

diff --git a/dlls/winex11.drv/x11drv.h b/dlls/winex11.drv/x11drv.h index 8e383ae4c48..85ab1bf6f4f 100644 --- a/dlls/winex11.drv/x11drv.h +++ b/dlls/winex11.drv/x11drv.h @@ -239,7 +239,7 @@ extern UINT X11DRV_ShowWindow( HWND hwnd, INT cmd, RECT *rect, UINT swp ); extern LRESULT X11DRV_SysCommand( HWND hwnd, WPARAM wparam, LPARAM lparam, const POINT *pos ); extern LRESULT X11DRV_ClipboardWindowProc( HWND hwnd, UINT msg, WPARAM wp, LPARAM lp ); extern void X11DRV_UpdateClipboard(void); -extern void X11DRV_UpdateLayeredWindow( HWND hwnd, UINT flags ); +extern void X11DRV_UpdateLayeredWindow( HWND hwnd, const BLENDFUNCTION *blend, UINT flags ); extern LRESULT X11DRV_WindowMessage( HWND hwnd, UINT msg, WPARAM wp, LPARAM lp ); extern BOOL X11DRV_WindowPosChanging( HWND hwnd, UINT swp_flags, BOOL shaped, const struct window_rects *rects ); extern BOOL X11DRV_GetWindowStyleMasks( HWND hwnd, UINT style, UINT ex_style, UINT *style_mask, UINT *ex_style_mask ); diff --git a/include/wine/gdi_driver.h b/include/wine/gdi_driver.h index 51a095fd2b0..cf278715803 100644 --- a/include/wine/gdi_driver.h +++ b/include/wine/gdi_driver.h @@ -381,7 +381,7 @@ struct user_driver_funcs void (*pSetWindowText)(HWND,LPCWSTR); UINT (*pShowWindow)(HWND,INT,RECT*,UINT); LRESULT (*pSysCommand)(HWND,WPARAM,LPARAM,const POINT*); - void (*pUpdateLayeredWindow)(HWND,UINT); + void (*pUpdateLayeredWindow)(HWND,const BLENDFUNCTION *,UINT); LRESULT (*pWindowMessage)(HWND,UINT,WPARAM,LPARAM); BOOL (*pWindowPosChanging)(HWND,UINT,BOOL,const struct window_rects *); BOOL (*pGetWindowStyleMasks)(HWND,UINT,UINT,UINT*,UINT*);

-- GitLab https://gitlab.winehq.org/wine/wine/-/merge_requests/7344