From 5cc83981d7cba1ea406432cd9ca9e030a482a3ab Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Deuc=D0=B5?= <shurd@sasktel.net>
Date: Mon, 1 May 2023 02:54:09 -0400
Subject: [PATCH] Only erase black bars and use BitBlt()
I expect BitBlt(..., BLACKNESS) to be the better optimized of the
two, and there's no reason to actually reat the source bitmap.
---
src/conio/win32gdi.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/src/conio/win32gdi.c b/src/conio/win32gdi.c
index ce9cfae8e7..001e12d1ff 100644
--- a/src/conio/win32gdi.c
+++ b/src/conio/win32gdi.c
@@ -323,7 +323,6 @@ gdi_handle_wm_paint(HWND hwnd)
else
SetDIBits(winDC, di, 0, dih, data, (BITMAPINFO *)&b5hdr, DIB_RGB_COLORS);
// Clear to black first
- StretchBlt(winDC, 0, 0, w, h, memDC, 0, 0, 1, 1, BLACKNESS);
di = SelectObject(memDC, di);
pthread_mutex_lock(&off_lock);
if (ciolib_scaling) {
@@ -332,6 +331,14 @@ gdi_handle_wm_paint(HWND hwnd)
else {
StretchBlt(winDC, xoff, yoff, dwidth, dheight, memDC, 0, 0, diw, dih, SRCCOPY);
}
+ if (xoff > 0) {
+ BitBlt(winDC, 0, 0, xoff - 1, dheight, memDC, 0, 0, BLACKNESS);
+ BitBlt(winDC, xoff + dwidth, 0, w, h, memDC, 0, 0, BLACKNESS);
+ }
+ else if (yoff > 0) {
+ BitBlt(winDC, 0, 0, w, yoff - 1, memDC, 0, 0, BLACKNESS);
+ BitBlt(winDC, 0, yoff + dheight, w, h, memDC, 0, 0, BLACKNESS);
+ }
pthread_mutex_unlock(&off_lock);
EndPaint(hwnd, &ps);
di = SelectObject(memDC, di);
--
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