uxtheme: Use StretchBlt() when resizing a source image for tiling.

For example, when a theme part has a source image with 0xff00ff as transparent pixels and the sizing margin is larger than the destination, the source image is first resized to fit the destination, during which, StretchBlt() should be used instead of TransparentBlt() because the image should not be blended with the temporary memory device context. Fix group box background may be drawn in black. Signed-off-by: Zhiyi Zhang <zzhang@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

uxtheme: Use StretchBlt() when resizing a source image for tiling.
bcbe1bcf · Zhiyi Zhang · Alexandre Julliard · 9c5fa40e · bcbe1bcf
Commit bcbe1bcf authored Nov 30, 2021 by Zhiyi Zhang Committed by Alexandre Julliard Dec 01, 2021
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draw.c dlls/uxtheme/draw.c +2 -1

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--- a/dlls/uxtheme/draw.c
+++ b/dlls/uxtheme/draw.c
@@ -779,8 +779,9 @@ static HRESULT UXTHEME_DrawImageBackground(HTHEME hTheme, HDC hdc, int iPartId,
            bmpSrcResized = CreateBitmap(srcSize.x, srcSize.y, 1, 32, NULL);
            SelectObject(hdcSrc, bmpSrcResized);

+            /* Use ALPHABLEND_NONE because the image is getting resized, rather than blended with the target */
            UXTHEME_StretchBlt(hdcSrc, 0, 0, srcSize.x, srcSize.y, hdcOrigSrc, rcSrc.left, rcSrc.top,
-                               rcSrc.right - rcSrc.left, rcSrc.bottom - rcSrc.top, transparent, transparentcolor);
+                               rcSrc.right - rcSrc.left, rcSrc.bottom - rcSrc.top, ALPHABLEND_NONE, 0);

            rcSrc.left = 0;
            rcSrc.top = 0;