[gs-bugs] [Bug 689290] An image with a soft mask gets invisible.

[bugs.ghostscript.com-bugzilla-daemon at ghostscript.com]

http://bugs.ghostscript.com/show_bug.cgi?id=689290





------- Additional Comments From michael.vrhel at artifex.com  2008-08-18 21:24 -------
The missing image is given as object 19 below with the 1-bit smask image.  As I
said above, the transparency code seems to be working correctly.  During the
push of the smask, image_render_simple uses copy portrait to copy the smask data
in object 20 to the PDF14 device.  Then, the pop mask occurs and a push of a
transparency group occurs.  The rendering of the image data of the 100Wide by
67High image data in object 19 should then occur.  This image is handled as a
image type 3x.  It seems to contain a mask of its own which is also a 1x1 like
the image in object 20.  This is sent to a memory device using
image_render_simple.  For some reason, it never seems to do anything with the
real image data, but flushes and moves on.  At one point, the renderer is set up
as image_render_color, but it never uses it.  It seems that one it finishes up
with the tiny mask associated with the image type 3x it cleans up and moves on. 

19 0 obj
<<
  /Subtype /Image
  /Width 100
  /Height 67
  /ColorSpace /DeviceRGB
  /BitsPerComponent 8
  /SMask 20 0 R
  /Length 17359
  /Filter /FlateDecode
>>
stream

IMAGE DATA

endstream
endobj

20 0 obj
<<
  /Subtype /Image
  /Width 1
  /Height 1
  /ColorSpace /DeviceGray
  /BitsPerComponent 1
  /Decode [ 0.7 0 ]
  /Length 1
>>
stream
.endstream
endobj




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