When the attached PDF file is rendered by Ghostscript a portion of a hidden path is visible (see attached screenshot.png). This path is correctly hidden when the file is opened by Adobe Acrobat 9 Pro. The command line I'm using for testing: bin/gs -r200 -sDEVICE=tiff24nc -o test.tif ./fiets_ned.pdf
Created attachment 4912 [details] fiets_ned.pdf
Created attachment 4913 [details] screenshot.png
The bug was introduced in rev. 8770. r8770 | leonardo | 2008-05-22 14:06:22 -0400 (Thu, 22 May 2008) | 25 lines Enhancement (graphics) : Delay applying type 1 raster patterns until clist interpretation (continued 4). The old code assumes that a pattern always fits into the clist writer buffer. However ppmraw -r400 176-01.ps violates this assumption. This patch implements a subdivision of a pattern into slices, each of which is smaller than the buffer size. 1. The new function cmd_get_buffer_space retrives maximal available space in the clist writer buffer (gxclutil.c). 2. cmd_put_drawing_color now implements a cycle for slicing big patterns. Each slice writes to clist as a separate clist instruction (gxclpath.c). 3. gx_dc_pattern_write_raster drops the constraint that the pattern fits into a single buffer (gsptype1.c). 4. The clist interpreter is enhanced with composing a pattern from slices
Created attachment 4920 [details] i9pv.pdf - simplified sample file [/Separation/None ...] is visible in the clip list rendering.
Created attachment 4926 [details] patch Write color to the clip list even when it has no variable data, as in [/Separation/None ...]. Fix a bug introduce by rev. 8770.
The patch is committed as a rev. 9634. There are progressions in Testform.v1.0.2.pdf and z400454b01d4-1.pdf .
The difference in 09-34.ps on page 6 is also progression.