[poppler] Weird rendering of a very simple pdf

[Leonard Rosenthol]

On 7/6/12 5:40 AM, "Adrian Johnson" <ajohnson at redneon.com> wrote:
>The problem appears to be that the rectangles are painted inside the
>text object. According the PDF standard, a text object consists of
>operators for showing text, moving the text position, and setting text
>state. It doesn't say anything about allowing graphics operators inside
>a text block. 

Actually, non-text operators aren't supported to be present inside of
BT/ET, however they aren't explicitly restricted (that I can find quickly
in 32K-1).



>If I put BT/ET around only the text operators then Adobe
>Reader paints the rectangles over the text. It looks like when graphics
>operators are inside a BT/ET block Adobe Reader renders the graphics
>operations first then the text. If I move the graphics operations to
>before the text block the pdf renders the same in both poppler and Adobe
>Reader.

That doesn't make sense - but I'll investigate what we are doing.


>I also tested the pdf with ghostscript and my printer which supports
>pdf. Ghostscript ignores the graphics operators inside the text block
>and only renders the text. My printer draws the rectangles over the text.

The GS implementation is perfectly reasonable.


Leonard