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Fixed alpha-blending issues on Windows.

This commit is contained in:
Pietro Gagliardi 2015-09-08 17:13:55 -04:00
parent 4d97644f94
commit fc3e13a4e6
1 changed files with 6 additions and 0 deletions
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6
winarea/draw.c
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@ -183,6 +183,7 @@ static void startAlpha(uiDrawContext *c, struct alpha *a)
BYTE *ops; BYTE *ops;
HRGN region; HRGN region;
BITMAPINFO bi; BITMAPINFO bi;
POINT prevWindowOrigin;
DWORD le; DWORD le;
ZeroMemory(a, sizeof (struct alpha)); ZeroMemory(a, sizeof (struct alpha));
@ -234,12 +235,17 @@ static void startAlpha(uiDrawContext *c, struct alpha *a)
logLastError("error selecting bitmap into DC in startAlpha()"); logLastError("error selecting bitmap into DC in startAlpha()");
// now we can finally copy the path like we were going to earlier // now we can finally copy the path like we were going to earlier
// we need to change the window origin so the path draws in the right place
if (SetWindowOrgEx(a->dc, a->r.left, a->r.top, &prevWindowOrigin) == 0)
logLastError("error setting window origin in startAlpha()");
if (BeginPath(a->dc) == 0) if (BeginPath(a->dc) == 0)
logLastError("error beginning path in startAlpha()"); logLastError("error beginning path in startAlpha()");
if (PolyDraw(a->dc, points, ops, n) == 0) if (PolyDraw(a->dc, points, ops, n) == 0)
logLastError("error copying path in startAlpha()"); logLastError("error copying path in startAlpha()");
if (EndPath(a->dc) == 0) if (EndPath(a->dc) == 0)
logLastError("error ending path in startAlpha()"); logLastError("error ending path in startAlpha()");
if (SetWindowOrgEx(a->dc, prevWindowOrigin.x, prevWindowOrigin.y, NULL) == 0)
logLastError("error resetting window origin in startAlpha()");
free(points); free(points);
free(ops); free(ops);
} }