Created attachment 56143 cairo - don't render text when text matrix is not invertable
The problem is the PDF file is using a noninvertible text matrix [0 0 0 0]. The PDF specification has this to say about noninvertible matrices: When rendering graphics objects, it is sometimes necessary for a conforming reader to perform the inverse of a transformation—that is, to find the user space coordinates that correspond to a given pair of device space coordinates. Not all transformations are invertible, however. For example, if a matrix contains a, b, c, and d elements that are all zero, all user coordinates map to the same device coordinates and there is no unique inverse transformation. Such noninvertible transformations are not very useful and generally arise from unintended operations, such as scaling by 0. Use of a noninvertible matrix when painting graphics objects can result in unpredictable behaviour. So the correct rendering of this PDF file is undefined. However to make the cairo output more closely emulate acroread behavior I attach a patch that ignores text when the text matrix is noninvertible. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to poppler in Ubuntu. https://bugs.launchpad.net/bugs/902033 Title: Size 0 dots are large and visible Status in Poppler: Confirmed Status in “poppler” package in Ubuntu: Confirmed Bug description: I'm creating some PDF files with dots of 0 size. In evince, they're visible: they're pretty large and off-center. In other viewers, such as Mac Preview and Adobe Reader on Mac, the dots are not visible. This code will generate a test file in R. There is a line of 10 dots going from lower left to upper right that should be visible. There's another line of 0mm dots going from upper left to lower right, and they should not be visible. library(grid) pdf("dotsizetest.pdf", width=4, height=4) x <- y <- 1:10 pushViewport(plotViewport(c(5.1, 4.1, 4.1, 2.1))) pushViewport(dataViewport(x, y)) grid.rect() grid.points(x, y) grid.points(x, 10-y, gp=gpar(fill="black"), size=unit(0,"mm")) popViewport(2) dev.off() EXPECTED RESULT: One diagonal line of dots ACTUAL RESULT: Two crossing diagonal lines of dots. $ lsb_release -rd Description: Ubuntu 11.10 Release: 11.10 $ apt-cache policy evince evince: Installed: 3.2.1-0ubuntu2 Candidate: 3.2.1-0ubuntu2 Version table: *** 3.2.1-0ubuntu2 0 500 http://mirror.anl.gov/pub/ubuntu/ oneiric-updates/main amd64 Packages 100 /var/lib/dpkg/status 3.2.0-0ubuntu1 0 500 http://mirror.anl.gov/pub/ubuntu/ oneiric/main amd64 Packages To manage notifications about this bug go to: https://bugs.launchpad.net/poppler/+bug/902033/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
