To: vim_dev@googlegroups.com
Subject: Patch 7.4.869
Fcc: outbox
From: Bram Moolenaar <Bram@moolenaar.net>
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------------

Patch 7.4.869
Problem:    MS-Windows: scrolling may cause text to disappear when using an
            Intel GPU.
Solution:   Call GetPixel(). (Yohei Endo)
Files:      src/gui_w48.c


*** ../vim-7.4.868/src/gui_w48.c	2015-09-15 14:12:01.382632522 +0200
--- src/gui_w48.c	2015-09-15 17:57:35.316887514 +0200
***************
*** 2389,2395 ****
  	return;
  
      if (first_tabpage->tp_next != NULL)
!         add_tabline_popup_menu_entry(tab_pmenu,
  					  TABLINE_MENU_CLOSE, _("Close tab"));
      add_tabline_popup_menu_entry(tab_pmenu, TABLINE_MENU_NEW, _("New tab"));
      add_tabline_popup_menu_entry(tab_pmenu, TABLINE_MENU_OPEN,
--- 2389,2395 ----
  	return;
  
      if (first_tabpage->tp_next != NULL)
! 	add_tabline_popup_menu_entry(tab_pmenu,
  					  TABLINE_MENU_CLOSE, _("Close tab"));
      add_tabline_popup_menu_entry(tab_pmenu, TABLINE_MENU_NEW, _("New tab"));
      add_tabline_popup_menu_entry(tab_pmenu, TABLINE_MENU_OPEN,
***************
*** 2931,2940 ****
  
      base_width = gui_get_base_width()
  	+ (GetSystemMetrics(SM_CXFRAME) +
!            GetSystemMetrics(SM_CXPADDEDBORDER)) * 2;
      base_height = gui_get_base_height()
  	+ (GetSystemMetrics(SM_CYFRAME) +
!            GetSystemMetrics(SM_CXPADDEDBORDER)) * 2
  	+ GetSystemMetrics(SM_CYCAPTION)
  #ifdef FEAT_MENU
  	+ gui_mswin_get_menu_height(FALSE)
--- 2931,2940 ----
  
      base_width = gui_get_base_width()
  	+ (GetSystemMetrics(SM_CXFRAME) +
! 	   GetSystemMetrics(SM_CXPADDEDBORDER)) * 2;
      base_height = gui_get_base_height()
  	+ (GetSystemMetrics(SM_CYFRAME) +
! 	   GetSystemMetrics(SM_CXPADDEDBORDER)) * 2
  	+ GetSystemMetrics(SM_CYCAPTION)
  #ifdef FEAT_MENU
  	+ gui_mswin_get_menu_height(FALSE)
***************
*** 2997,3002 ****
--- 2997,3016 ----
  }
  
  /*
+  * On some Intel GPUs, the regions drawn just prior to ScrollWindowEx()
+  * may not be scrolled out properly.
+  * For gVim, when _OnScroll() is repeated, the character at the
+  * previous cursor position may be left drawn after scroll.
+  * The problem can be avoided by calling GetPixel() to get a pixel in
+  * the region before ScrollWindowEx().
+  */
+     static void
+ intel_gpu_workaround(void)
+ {
+     GetPixel(s_hdc, FILL_X(gui.col), FILL_Y(gui.row));
+ }
+ 
+ /*
   * Delete the given number of lines from the given row, scrolling up any
   * text further down within the scroll region.
   */
***************
*** 3007,3012 ****
--- 3021,3028 ----
  {
      RECT	rc;
  
+     intel_gpu_workaround();
+ 
      rc.left = FILL_X(gui.scroll_region_left);
      rc.right = FILL_X(gui.scroll_region_right + 1);
      rc.top = FILL_Y(row);
***************
*** 3038,3043 ****
--- 3054,3061 ----
  {
      RECT	rc;
  
+     intel_gpu_workaround();
+ 
      rc.left = FILL_X(gui.scroll_region_left);
      rc.right = FILL_X(gui.scroll_region_right + 1);
      rc.top = FILL_Y(row);
***************
*** 3319,3328 ****
      GetWindowRect(s_hwnd, &rect);
      gui_resize_shell(rect.right - rect.left
  			- (GetSystemMetrics(SM_CXFRAME) +
!                            GetSystemMetrics(SM_CXPADDEDBORDER)) * 2,
  		     rect.bottom - rect.top
  			- (GetSystemMetrics(SM_CYFRAME) +
!                            GetSystemMetrics(SM_CXPADDEDBORDER)) * 2
  			- GetSystemMetrics(SM_CYCAPTION)
  #ifdef FEAT_MENU
  			- gui_mswin_get_menu_height(FALSE)
--- 3337,3346 ----
      GetWindowRect(s_hwnd, &rect);
      gui_resize_shell(rect.right - rect.left
  			- (GetSystemMetrics(SM_CXFRAME) +
! 			   GetSystemMetrics(SM_CXPADDEDBORDER)) * 2,
  		     rect.bottom - rect.top
  			- (GetSystemMetrics(SM_CYFRAME) +
! 			   GetSystemMetrics(SM_CXPADDEDBORDER)) * 2
  			- GetSystemMetrics(SM_CYCAPTION)
  #ifdef FEAT_MENU
  			- gui_mswin_get_menu_height(FALSE)
*** ../vim-7.4.868/src/version.c	2015-09-15 17:30:35.913682004 +0200
--- src/version.c	2015-09-15 17:55:53.009950236 +0200
***************
*** 743,744 ****
--- 743,746 ----
  {   /* Add new patch number below this line */
+ /**/
+     869,
  /**/

-- 
Lower life forms have more fun!

 /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net   \\\
///        sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
\\\  an exciting new programming language -- http://www.Zimbu.org        ///
 \\\            help me help AIDS victims -- http://ICCF-Holland.org    ///