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/* compute bounding box information for a linked list of plOutbufs
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(i.e. pages), starting with a specified plOutbuf (i.e., page) */
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_bbox_of_outbufs (plOutbuf *bufp, double *xmin, double *xmax, double *ymin, double *ymax)
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_bbox_of_outbufs (bufp, xmin, xmax, ymin, ymax)
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double *xmin, *xmax, *ymin, *ymax;
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double doc_x_min = DBL_MAX;
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double doc_y_min = DBL_MAX;