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This commit removes shape.alpha and opacity.alpha from the
graphic state. This involved removal of methods in the
postscript based PDF interpreter, changes in the pdf14 device,
changes in pdfwrite, the XPS interpreter, and the PS
transparency test file that is present in examples and on
the cluster. The goal of this commit was to avoid
confusion and conflicts between shape.alpha opacity.alpha and
the stroke and fill alpha values (CA ca). This change
resulted in progressions in the XPS file. There were changes
in a couple PDF files that required some investigation. In
particular, the change in the dashed lines of Bug694981.pdf. Robin
and I looked at this. Robin determined it was due to
differences in stroke_add and stroke_fill not giving identical results.
In the end, the new output looks closer the what AR provides.
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-dALLOWPSTRANSPARENCY on the command line will prevent the undefining of the
non-standard gs Postscript transparency operators.
Driving these operators in the wrong way can cause undefined behavior, hence
not allowing them normally.
Also, use a better condition for dropping the transparency ops in:
examples/transparency_example.ps
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So it prints a warning and runs to completion, rather than erroring out
when -dSAFER is set.
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When a file pushes a pdf14devicefilter (or other compositor) it will
still be the currentdevice after the filter is popped when the saved
pages printing occurs. We need to check if the device is a forwarding
device (as compositors will be when deactivated) and use the target
device to print the saved pages.
Also, if a device uses the gx_default_dev_spec_op, it will return 0
from the supports_saved_pages call even when it is a printer device.
In gdev_prn_forwarding_dev_spec_op, check for a zero return and return
true (1). A device that is a printer device that doesn't support saved
page printing needs to return < 0 to prevent this.
Add a finalize method for gx_device_printer so we can free up the saved-
pages-list when the device is freed, but not when the device is closed
which can happen if it needs to close due to put_params. Also the
return code from the output_page in gx_saved_page_params_process was
ignored. Both seen with the file Bug687111.ps and the psdcmyk device.
Also for devn devices, such as psdcmyk, we need to save the separation
(spot color) names collected during the execution of setcolorspace in
the gx_saved_page and set them in the devn_params when rendering. These
are not handled by the paramlist.
Disable --saved-pages= and --saved-pages-test with PCL and XPS since it
was never completely implemented and the partial implementation causes
many errors when tested with --saved-pages-test. Note that while the
--saved-pages-test option is still accepted as a parameter, it is ignored
so that regression testing with --saved-pages-test can run.
Regression shows 3343 "diffs", but bmpcmp doesn't show any diffs.
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The PDF14 transparency compositor changes the colorspace to Gray
(8-bit), but if a 1-bit deep device is the target device, and the
normal startup for transparent pages doesn't happen, the playback
would write 8-bit data to a 1-bit deep buffer
Also fix the transparency_example.ps so that it sets the device param
PageUsesTransparency which is expected.
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From Michael Vrhel:
The ps file transparency_example.ps failed to set the number of spot
colors on the page. This information is expected to be provided
for the pdf14 device by the PDF interpreter when we are dealing with the
separable devices (e.g. psdcmyk, tiffsep)
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Squashed into one commit (see branch for details of the evolution of the
branch).
This brings gpcl6 and gxps into the Ghostscript build system, and a shared
set of graphics library object files for all the interpreters.
Also, brings the same configuration options to the pcl and xps products as we
have for Ghostscript.
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