[Poppler-bugs] [Bug 49590] Image does not show on PDF due to ICC Profile reading error.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49590

--- Comment #3 from Adrian Johnson <ajohnson at redneon.com> ---
The broken ICC profile is a red herring. The problem is an XObject with a huge
BBox that overflows cairo's 24.8 fixed point.

In PDF all images have a size of 1x1. Normally the ctm is set to make the image
the correct size then the image is drawn. eg

q 640 0 0 480 0 0 /Img Do Q

But in this PDF the image is inside a XObject. eg

q 540 0 0 800 0 0 /Foo Do Q

/Foo is:

<<
/Type /XObject
/BBox [0 0 20000 20000]
>>
stream
/Img Do
endstream


The actual BBox of Foo is 1x1. When cairo converts the 20000x20000 clip path to
device units it overflows the 24.8 fixed point resulting a very small clip path
the just happens to be an all white region of the image.

I'm not sure what would be the best way to fix this. One solution would be to
add a range check flag to doPath() which is set in ::clip. In doPath() when the
range check is enabled, check if the path is a rectangle and if it is,
intersect it with the current clip region before calling cairo clip.

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