diff options
Diffstat (limited to 'src/gui_w32.c')
-rw-r--r-- | src/gui_w32.c | 59 |
1 files changed, 49 insertions, 10 deletions
diff --git a/src/gui_w32.c b/src/gui_w32.c index 5bc5a3903d..b296861440 100644 --- a/src/gui_w32.c +++ b/src/gui_w32.c @@ -2986,6 +2986,42 @@ gui_mch_flash(int msec) } /* + * Check if the specified point is on-screen. (multi-monitor aware) + */ + static BOOL +is_point_onscreen(int x, int y) +{ + POINT pt = {x, y}; + + return MonitorFromPoint(pt, MONITOR_DEFAULTTONULL) != NULL; +} + +/* + * Check if the whole area of the specified window is on-screen. + * + * Note about DirectX: Windows 10 1809 or above no longer maintains image of + * the window portion that is off-screen. Scrolling by DWriteContext_Scroll() + * only works when the whole window is on-screen. + */ + static BOOL +is_window_onscreen(HWND hwnd) +{ + RECT rc; + + GetWindowRect(hwnd, &rc); + + if (!is_point_onscreen(rc.left, rc.top)) + return FALSE; + if (!is_point_onscreen(rc.left, rc.bottom)) + return FALSE; + if (!is_point_onscreen(rc.right, rc.top)) + return FALSE; + if (!is_point_onscreen(rc.right, rc.bottom)) + return FALSE; + return TRUE; +} + +/* * Return flags used for scrolling. * The SW_INVALIDATE is required when part of the window is covered or * off-screen. Refer to MS KB Q75236. @@ -2996,15 +3032,12 @@ get_scroll_flags(void) HWND hwnd; RECT rcVim, rcOther, rcDest; - GetWindowRect(s_hwnd, &rcVim); - - // Check if the window is partly above or below the screen. We don't care - // about partly left or right of the screen, it is not relevant when - // scrolling up or down. - if (rcVim.top < 0 || rcVim.bottom > GetSystemMetrics(SM_CYFULLSCREEN)) + // Check if the window is (partly) off-screen. + if (!is_window_onscreen(s_hwnd)) return SW_INVALIDATE; // Check if there is an window (partly) on top of us. + GetWindowRect(s_hwnd, &rcVim); for (hwnd = s_hwnd; (hwnd = GetWindow(hwnd, GW_HWNDPREV)) != (HWND)0; ) if (IsWindowVisible(hwnd)) { @@ -3046,14 +3079,17 @@ gui_mch_delete_lines( rc.bottom = FILL_Y(gui.scroll_region_bot + 1); #if defined(FEAT_DIRECTX) - if (IS_ENABLE_DIRECTX()) + if (IS_ENABLE_DIRECTX() && is_window_onscreen(s_hwnd)) { DWriteContext_Scroll(s_dwc, 0, -num_lines * gui.char_height, &rc); - DWriteContext_Flush(s_dwc); } else #endif { +#if defined(FEAT_DIRECTX) + if (IS_ENABLE_DIRECTX()) + DWriteContext_Flush(s_dwc); +#endif intel_gpu_workaround(); ScrollWindowEx(s_textArea, 0, -num_lines * gui.char_height, &rc, &rc, NULL, NULL, get_scroll_flags()); @@ -3088,14 +3124,17 @@ gui_mch_insert_lines( rc.bottom = FILL_Y(gui.scroll_region_bot + 1); #if defined(FEAT_DIRECTX) - if (IS_ENABLE_DIRECTX()) + if (IS_ENABLE_DIRECTX() && is_window_onscreen(s_hwnd)) { DWriteContext_Scroll(s_dwc, 0, num_lines * gui.char_height, &rc); - DWriteContext_Flush(s_dwc); } else #endif { +#if defined(FEAT_DIRECTX) + if (IS_ENABLE_DIRECTX()) + DWriteContext_Flush(s_dwc); +#endif intel_gpu_workaround(); // The SW_INVALIDATE is required when part of the window is covered or // off-screen. How do we avoid it when it's not needed? |