ps2write - create document %%BoundingBox from teh individual page Bounding boxes

Bug #693181

The document level BoundingBox is supposed to be the intersection of the
boundingbox of all the pages, whereas in fact it is the device media size.

Now we create the document BoundingBox by taking largest dimensions from all
the pages in the output.

NB the BoundingBox for each page is given from the media request, so this is
not a true BoundingBox anyway, but at least it is better then before.

1 files changed, 23 insertions, 3 deletions

diff --git a/gs/base/gdevpdfu.c b/gs/base/gdevpdfu.c
index 8518349ad..d4e9432ab 100644
--- a/gs/base/gdevpdfu.c
+++ b/gs/base/gdevpdfu.c
@@ -402,11 +402,31 @@ int ps2write_dsc_header(gx_device_pdf * pdev, int pages)
         char cre_date_time[41];
         int code, status, cre_date_time_len;
         char BBox[256];
-        int width = (int)(pdev->width * 72.0 / pdev->HWResolution[0] + 0.5);
-        int height = (int)(pdev->height * 72.0 / pdev->HWResolution[1] + 0.5);
 
         stream_write(s, (byte *)"%!PS-Adobe-3.0\n", 15);
-        sprintf(BBox, "%%%%BoundingBox: 0 0 %d %d\n", width, height);
+        /* We need to calculate the document BoundingBox which is a 'high water'
+         * mark derived from the BoundingBox of all the individual pages.
+         */
+        {
+            int pagecount = 1;
+            int urx=0, ury=0, j;
+
+            for (j = 0; j < NUM_RESOURCE_CHAINS; ++j) {
+                pdf_resource_t *pres = pdev->resources[resourcePage].chains[j];
+
+                for (; pres != 0; pres = pres->next)
+                    if ((!pres->named || pdev->ForOPDFRead)
+                        && !pres->object->written) {
+                        pdf_page_t *page = &pdev->pages[pagecount - 1];
+                        if ((int)ceil(page->MediaBox.x) > urx)
+                            urx = page->MediaBox.x;
+                        if ((int)ceil(page->MediaBox.y) > urx)
+                            ury = page->MediaBox.y;
+                        pagecount++;
+                    }
+            }
+            sprintf(BBox, "%%%%BoundingBox: 0 0 %d %d\n", urx, ury);
+        }
         stream_write(s, (byte *)BBox, strlen(BBox));
         cre_date_time_len = pdf_get_docinfo_item(pdev, "/CreationDate", cre_date_time, sizeof(cre_date_time) - 1);
         cre_date_time[cre_date_time_len] = 0;