DPMS screen blanking support

src/include/86box/language.h

@@ -115,6 +115,7 @@
 #define IDS_2139	2139		// "MO images (*.IM?)\0*.IM?..."
 #define IDS_2140	2140		// "CD-ROM images (*.ISO;*.CU.."
 #define IDS_2141	2141		// "%hs Device Configuration"
+#define IDS_2142	2142		// "Monitor in sleep mode"
 
 #define IDS_4096	4096		// "Hard disk (%s)"
 #define IDS_4097	4097		// "%01i:%01i"
@@ -222,7 +223,7 @@
 
 #define IDS_LANG_ENUS	IDS_7168
 
-#define STR_NUM_2048	94
+#define STR_NUM_2048	95
 #define STR_NUM_3072	11
 #define STR_NUM_4096	39
 #define STR_NUM_4352	6

src/include/86box/vid_svga.h

@@ -135,6 +135,7 @@ typedef struct svga_t
 	    plane_mask, writemask,
 	    colourcompare, colournocare,
 	    dac_mask, dac_status,
+	    dpms, dpms_ui,
 	    ksc5601_sbyte_mask, ksc5601_udc_area_msb[2];
 
     int ksc5601_swap_mode;

src/video/vid_svga.c

@@ -34,6 +34,8 @@
 #include <86box/pit.h>
 #include <86box/mem.h>
 #include <86box/rom.h>
+#include <86box/plat.h>
+#include <86box/ui.h>
 #include <86box/video.h>
 #include <86box/vid_svga.h>
 #include <86box/vid_svga_render.h>
@@ -574,12 +576,29 @@ svga_recalctimings(svga_t *svga)
 	svga->dispontime = TIMER_USEC;
     if (svga->dispofftime < TIMER_USEC)
 	svga->dispofftime = TIMER_USEC;
+
+    /* Inform the user interface of any DPMS mode changes. */
+    if (svga->dpms) {
+	if (!svga->dpms_ui) {
+		svga->dpms_ui = 1;
+		ui_sb_set_text_w(plat_get_string(IDS_2142));
+	}
+    } else if (svga->dpms_ui) {
+	svga->dpms_ui = 0;
+	ui_sb_set_text_w(NULL);
+    }
 }
 
 
 static void
 svga_do_render(svga_t *svga)
 {
+    /* Always render a blank screen and nothing else while in DPMS mode. */
+    if (svga->dpms) {
+	svga_render_blank(svga);
+	return;
+    }
+
     if (!svga->override) {
 	svga->render(svga);
 
@@ -1361,7 +1380,10 @@ svga_doblit(int y1, int y2, int wx, int wy, svga_t *svga)
 	} else
 		suppress_overscan = 0;
 
-	set_screen_size(xsize + x_add, ysize + y_add);
+	/* Block resolution changes while in DPMS mode to avoid getting a bogus
+	   screen width (320). We're already rendering a blank screen anyway. */
+	if (!svga->dpms)
+		set_screen_size(xsize + x_add, ysize + y_add);
 
 	if (video_force_resize_get())
 		video_force_resize_set(0);

src/win/86Box.rc

@@ -1054,6 +1054,7 @@ BEGIN
     IDS_2139	"MO images (*.IM?;*.MDI)\0*.IM?;*.MDI\0All files (*.*)\0*.*\0"
     IDS_2140	"CD-ROM images (*.ISO;*.CUE)\0*.ISO;*.CUE\0All files (*.*)\0*.*\0"
     IDS_2141	"%hs Device Configuration"
+    IDS_2142    "Monitor in sleep mode"
 END
 
 STRINGTABLE DISCARDABLE 

src/win/win_stbar.c

@@ -72,6 +72,8 @@ static int	sb_ready = 0;
 static uint8_t	sb_map[256];
 static int  dpi = 96;
 static int  icon_width = 24;
+static wchar_t	sb_text[512] = L"\0";
+static wchar_t	sb_bugtext[512] = L"\0";
 
 /* Also used by win_settings.c */
 intptr_t
@@ -933,9 +935,8 @@ StatusBarCreate(HWND hwndParent, uintptr_t idStatus, HINSTANCE hInst)
 }
 
 
-/* API */
-void
-ui_sb_set_text_w(wchar_t *wstr)
+static void
+ui_sb_update_text()
 {
     uint8_t part = 0xff;
 
@@ -945,7 +946,19 @@ ui_sb_set_text_w(wchar_t *wstr)
     part = sb_map[SB_TEXT];
 
     if (part != 0xff)
-	SendMessage(hwndSBAR, SB_SETTEXT, part | SBT_NOBORDERS, (LPARAM)wstr);
+	SendMessage(hwndSBAR, SB_SETTEXT, part | SBT_NOBORDERS, (LPARAM)((sb_text[0] != L'\0') ? sb_text : sb_bugtext));
+}
+
+
+/* API */
+void
+ui_sb_set_text_w(wchar_t *wstr)
+{
+    if (wstr)
+	wcscpy(sb_text, wstr);
+    else
+	memset(sb_text, 0x00, sizeof(sb_text));
+    ui_sb_update_text();
 }
 
 
@@ -953,11 +966,11 @@ ui_sb_set_text_w(wchar_t *wstr)
 void
 ui_sb_set_text(char *str)
 {
-    static wchar_t wstr[512];
-
-    memset(wstr, 0x00, sizeof(wstr));
-    mbstowcs(wstr, str, strlen(str) + 1);
-    ui_sb_set_text_w(wstr);
+    if (str)
+	mbstowcs(sb_text, str, strlen(str) + 1);
+    else
+	memset(sb_text, 0x00, sizeof(sb_text));
+    ui_sb_update_text();
 }
 
 
@@ -965,9 +978,9 @@ ui_sb_set_text(char *str)
 void
 ui_sb_bugui(char *str)
 {
-    static wchar_t wstr[512];
-
-    memset(wstr, 0x00, sizeof(wstr));
-    mbstowcs(wstr, str, strlen(str) + 1);
-    ui_sb_set_text_w(wstr);
+    if (str)
+	mbstowcs(sb_bugtext, str, strlen(str) + 1);
+    else
+	memset(sb_bugtext, 0x00, sizeof(sb_bugtext));
+    ui_sb_update_text();
 }