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From "Myroslav Golub (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IMAGING-162) BMP files with negative bitmap height are not suported
Date Tue, 03 Feb 2015 07:16:34 GMT

    [ https://issues.apache.org/jira/browse/IMAGING-162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14302875#comment-14302875
] 

Myroslav Golub commented on IMAGING-162:
----------------------------------------

[~mgmechanics], here's the link: http://www.fileformat.info/format/bmp/egff.htm

Following are the quotes from the document:

{quote}
Width and Height are the width and height of the image in pixels, respectively. If Height
is a positive number, then the image is a "bottom-up" bitmap with the origin in the lower-left
corner. If Height is a negative number, then the image is a "top-down" bitmap with the origin
in the upper-left corner.
{quote}

{quote}
Scan lines are stored from the bottom up if the value of the Height field in the bitmap header
is a positive value; they are stored from the top down if the Height field value is negative.

{quote}

> BMP files with negative bitmap height are not suported
> ------------------------------------------------------
>
>                 Key: IMAGING-162
>                 URL: https://issues.apache.org/jira/browse/IMAGING-162
>             Project: Commons Imaging
>          Issue Type: Bug
>          Components: Format: BMP
>    Affects Versions: 1.0
>            Reporter: Myroslav Golub
>             Fix For: Patch Needed
>
>
> The BMP format allows for negative values of the height field in the header. This means
that the image lines are stored top-down, not bottom-up as usual (i. e. the first pixel in
the pixel array would be in the top left corner of the image, not in the bottom left as usual).
However, when a negative-height bitmap is passed, the BmpImageParser attempts to create an
array of negative length, and a NegativeArraySizeException ensues.



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