Esme Povirk : gdiplus: Fix DIB stride calculation in GdipDrawImagePointsRect.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 6753f25f5870744d1eaa4c80d648452db2a12e98
URL:    https://gitlab.winehq.org/wine/wine/-/commit/6753f25f5870744d1eaa4c80d648452...

Author: Esme Povirk <esme(a)codeweavers.com>
Date:   Tue Jun 11 16:21:36 2024 +0000

gdiplus: Fix DIB stride calculation in GdipDrawImagePointsRect.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=56800

---

 dlls/gdiplus/graphics.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/dlls/gdiplus/graphics.c b/dlls/gdiplus/graphics.c
index 14e09e7cc47..265b3363ca9 100644
--- a/dlls/gdiplus/graphics.c
+++ b/dlls/gdiplus/graphics.c
@@ -3427,6 +3427,7 @@ GpStatus WINGDIPAPI GdipDrawImagePointsRect(GpGraphics *graphics, GpImage *image
             BITMAPINFOHEADER bih;
             BYTE *temp_bits;
             PixelFormat dst_format;
+            INT dib_stride;
 
             src_hdc = CreateCompatibleDC(0);
 
@@ -3453,8 +3454,10 @@ GpStatus WINGDIPAPI GdipDrawImagePointsRect(GpGraphics *graphics, GpImage *image
             hbitmap = CreateDIBSection(src_hdc, (BITMAPINFO*)&bih, DIB_RGB_COLORS,
                 (void**)&temp_bits, NULL, 0);
 
+            dib_stride = ((bitmap->width * PIXELFORMATBPP(dst_format) + 31) / 8) & ~3;
+
             convert_pixels(bitmap->width, bitmap->height,
-                bitmap->width*PIXELFORMATBPP(dst_format)/8, temp_bits, dst_format, bitmap->image.palette,
+                dib_stride, temp_bits, dst_format, bitmap->image.palette,
                 bitmap->stride, bitmap->bits, bitmap->format,
                 bitmap->image.palette);