[PATCH v2 0/1] MR4812: user32: Fix the number of characters processed by DrawTextExW.

[江仪 陈 (＠meshine)]

Description:
    When flags does not include DT_CALCRECT, since len is calculated in the middle,
    it will be reduced to zero. Resulting in the length of the processed string that
    is finally returned to zero and the non-processing string length is unchanged.
    But some application taking the non-processing string length to zero as the loop
    end condition.

Log:

Signed-off-by: chenjiangyi 
Change-Id: Icc0f250f5f4faba1bee8326fc911a4fc9cd7c012

--
  v2: user32: Fix the number of characters processed by DrawTextExW.

https://gitlab.winehq.org/wine/wine/-/merge_requests/4812

[PATCH v2 1/1] user32: Fix the number of characters processed by DrawTextExW.

[chenjiangyi]

From: chenjiangyi

Description:
    When flags does not include DT_CALCRECT, since len is calculated in the middle,
    it will be reduced to zero. Resulting in the length of the processed string that
    is finally returned to zero and the non-processing string length is unchanged.
    But some application taking the non-processing string length to zero as the loop
    end condition.

Log:

Signed-off-by: chenjiangyi 
Change-Id: Icc0f250f5f4faba1bee8326fc911a4fc9cd7c012
---
 dlls/user32/text.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/dlls/user32/text.c b/dlls/user32/text.c
index 1896627c893..8bc393e3664 100644
--- a/dlls/user32/text.c
+++ b/dlls/user32/text.c
@@ -1021,10 +1021,13 @@ INT WINAPI DrawTextExW( HDC hdc, LPWSTR str, INT i_count,
                 }
                 len -= len_seg;
                 str += len_seg;
+                if (dtp) dtp->uiLengthDrawn += len_seg;
+
                 if (len)
                 {
                     assert ((flags & DT_EXPANDTABS) && *str == TAB);
                     len--; str++;
+                    if (dtp) dtp->uiLengthDrawn++;
                     xseg += ((size.cx/tabwidth)+1)*tabwidth;
                     if (prefix_offset != -1)
                     {
@@ -1044,15 +1047,18 @@ INT WINAPI DrawTextExW( HDC hdc, LPWSTR str, INT i_count,
                 }
             }
    }
-	else if (size.cx > max_width)
-	    max_width = size.cx;
+	else
+    {
+        if (dtp) dtp->uiLengthDrawn += len;
+
+        if (size.cx > max_width)
+	        max_width = size.cx;
+    }

if (invert_y)
        y -= lh;
         else
        y += lh;
-        if (dtp)
-            dtp->uiLengthDrawn += len;
     }
     while (strPtr && !last_line);

[Alex Henrie (＠alexhenrie)]

Can you add a test please?