[NTGDI] Fix SAI Paint Tool Initial Graphics Display

Doug-Lyons · Doug-Lyons · commit e806c24bc285 · 2025-08-22T17:27:04.000-05:00
CORE-15002
diff --git a/win32ss/gdi/ntgdi/dibobj.c b/win32ss/gdi/ntgdi/dibobj.c
@@ -532,7 +532,10 @@ NtGdiSetDIBitsToDeviceInternal(
     {
         ScanLines = min(abs(Height), ScanLines);
         if (YSrc > 0)
+        {
             ScanLines += YSrc;
+            YSrc = 0;
+        }
     }
     else
     {
@@ -582,7 +585,7 @@ NtGdiSetDIBitsToDeviceInternal(
 
     SourceSize.cx = bmi->bmiHeader.biWidth;
     SourceSize.cy = ScanLines;
-    if (YDest >= 0 && YSrc > 0)
+    if (YDest >= 0 && YSrc >= 0)
     {
         ScanLines += YSrc;
     }

Original file line number	Diff line number	Diff line change
`@@ -532,7 +532,10 @@ NtGdiSetDIBitsToDeviceInternal(`
`532`	`532`	`{`
`533`	`533`	`ScanLines = min(abs(Height), ScanLines);`
`534`	`534`	`if (YSrc > 0)`
	`535`	`+ {`
`535`	`536`	`ScanLines += YSrc;`
	`537`	`+ YSrc = 0;`
	`538`	`+ }`
`536`	`539`	`}`
`537`	`540`	`else`
`538`	`541`	`{`
`@@ -582,7 +585,7 @@ NtGdiSetDIBitsToDeviceInternal(`
`582`	`585`
`583`	`586`	`SourceSize.cx = bmi->bmiHeader.biWidth;`
`584`	`587`	`SourceSize.cy = ScanLines;`
`585`		`- if (YDest >= 0 && YSrc > 0)`
	`588`	`+ if (YDest >= 0 && YSrc >= 0)`
`586`	`589`	`{`
`587`	`590`	`ScanLines += YSrc;`
`588`	`591`	`}`