[gs-bugs] [Bug 691856] page rendering blurry when rotated (=?UTF-8?Q?90=C2=B0=20or=20270=C2=B0?=)

[bugzilla-daemon at ghostscript.com]

http://bugs.ghostscript.com/show_bug.cgi?id=691856

--- Comment #6 from zeniko at gmail.com 2011-01-05 15:10:42 UTC ---
The following patch seems to fix our issue:

Index: mupdf/draw/imagedraw.c
===================================================================
--- mupdf/draw/imagedraw.c      (revision 2604)
+++ mupdf/draw/imagedraw.c      (working copy)
@@ -295,6 +295,9 @@
                dolerp = 1;
        if (sqrtf(ctm.b * ctm.b + ctm.d * ctm.d) > img->h)
                dolerp = 1;
+       /* cf. http://bugs.ghostscript.com/show_bug.cgi?id=691856 */
+       if (dolerp && fz_isrectilinear(ctm) && img->w == (int)(ctm.a + ctm.b)
&& img->h == (int)(ctm.c + ctm.d))
+               dolerp = 0;

        bbox = fz_roundrect(fz_transformrect(ctm, fz_unitrect));
        bbox = fz_intersectbbox(bbox, scissor);

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