[PATCH 0/1] MR8178: user32: Fix the number of characters processed by DrawTextExW.

[JiangYi Chen (＠meshine)]

@alexhenrie @zhiyi

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.

The test case's merge request number is 8177.

Signed-off-by: chenjiangyi

[PATCH 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.

Signed-off-by: chenjiangyi 
---
 dlls/user32/text.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/dlls/user32/text.c b/dlls/user32/text.c
index 1896627c893..b026ca7b4ed 100644
--- a/dlls/user32/text.c
+++ b/dlls/user32/text.c
@@ -871,7 +871,7 @@ INT WINAPI DrawTextExW( HDC hdc, LPWSTR str, INT i_count,
     WCHAR *retstr;
     size_t size_retstr;
     WCHAR line[MAX_BUFFER];
-    int len, lh, count=i_count;
+    int len, lh, old_count, count=i_count;
     TEXTMETRICW tm;
     int lmargin = 0, rmargin = 0;
     int x, y, width;
@@ -978,7 +978,10 @@ INT WINAPI DrawTextExW( HDC hdc, LPWSTR str, INT i_count,
             last_line = !(flags & DT_NOCLIP) && y - ((flags & DT_EDITCONTROL) ? 2*lh-1 : lh) < rect->bottom;
    else
             last_line = !(flags & DT_NOCLIP) && y + ((flags & DT_EDITCONTROL) ? 2*lh-1 : lh) > rect->bottom;
+    
+    old_count = count;
    strPtr = TEXT_NextLineW(hdc, strPtr, &count, line, &len, width, flags, &size, last_line, retstr, tabwidth, &prefix_offset, &ellip);
+    if (dtp)  dtp->uiLengthDrawn += old_count - count;

if (flags & DT_CENTER)
             x = (rect->left + lmargin + rect->right - rmargin - size.cx) / 2;
@@ -1051,8 +1054,6 @@ INT WINAPI DrawTextExW( HDC hdc, LPWSTR str, INT i_count,
        y -= lh;
         else
        y += lh;
-        if (dtp)
-            dtp->uiLengthDrawn += len;
     }
     while (strPtr && !last_line);

[Zhiyi Zhang (＠zhiyi)]

I don't know why you put tests in another MR. That's not going to help get this in. Please put them in the same MR. Then, after you fix the bug, remove todo_wine from the tests.

You need to have a better description of the fix. If I understand it correctly, the problem is that uiLengthDrawn is not calculated correctly without DT_CALCRECT. So please focus on that. Also, could you simplify the tests a bit? Some of them seem to be duplicates.