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Allow application to use VGA window that overlaps framebuffer only 

partially.
This commit is contained in:
Jukka Heinonen 2003-08-29 22:13:11 +00:00 committed by Alexandre Julliard
parent 528e6e9836
commit f68017b851
1 changed files with 32 additions and 9 deletions
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41
dlls/winedos/vga.c
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@ -363,6 +363,32 @@ typedef struct {
int ret;
} ModeSet;
/**********************************************************************
* VGA_SyncWindow
*
* Copy VGA window into framebuffer (if argument is TRUE) or
* part of framebuffer into VGA window (if argument is FALSE).
*/
static void VGA_SyncWindow( BOOL target_is_fb )
{
int size = VGA_WINDOW_SIZE;
/* Window does not overlap framebuffer. */
if (vga_fb_window >= vga_fb_size)
return;
/* Check if window overlaps framebuffer only partially. */
if (vga_fb_size - vga_fb_window < VGA_WINDOW_SIZE)
size = vga_fb_size - vga_fb_window;
if (target_is_fb)
memmove( vga_fb_data + vga_fb_window, VGA_WINDOW_START, size );
else
memmove( VGA_WINDOW_START, vga_fb_data + vga_fb_window, size );
}
static void WINAPI VGA_DoExit(ULONG_PTR arg)
{
VGA_DeinstallTimer();
@ -603,17 +629,15 @@ void VGA_SetWindowStart(int start)
if(vga_fb_window == -1)
FIXME("Remove VGA memory emulation.\n");
else if(vga_fb_window + VGA_WINDOW_SIZE < vga_fb_size)
memmove(vga_fb_data + vga_fb_window, VGA_WINDOW_START,
VGA_WINDOW_SIZE);
else
VGA_SyncWindow( TRUE );
vga_fb_window = start;
if(vga_fb_window == -1)
FIXME("Install VGA memory emulation.\n");
else if(vga_fb_window + VGA_WINDOW_SIZE < vga_fb_size)
memmove( VGA_WINDOW_START, vga_fb_data + vga_fb_window,
VGA_WINDOW_SIZE);
else
VGA_SyncWindow( FALSE );
LeaveCriticalSection(&vga_lock);
}
@ -925,9 +949,8 @@ static void VGA_Poll_Graphics(void)
/*
* Synchronize framebuffer contents.
*/
if(vga_fb_window != -1 && vga_fb_window + VGA_WINDOW_SIZE < vga_fb_size)
memmove(vga_fb_data + vga_fb_window, VGA_WINDOW_START,
VGA_WINDOW_SIZE);
if (vga_fb_window != -1)
VGA_SyncWindow( TRUE );
/*
* Double VGA framebuffer (320x200 -> 640x400), if needed.