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The GIMP Generated Brush File Format Version 1 (.vbr)
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Updated August 24, 2006.

The VBR format is used for "generated" brushes, that is, brushes
specified by a set of numerical parameters rather than a bitmap or
pixmap.  This format dates back to at least 1998, although it
has been tweaked several times.  The most recent tweak, in August
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2004, added support for variable shapes.  Prior to this, the
version number used was always 1.0.  The version number used for
shaped brushes is 1.5. 
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VBR files are plain text tiles, consisting of a set of fields
separated by line breaks.  The number of lines is variable, 10 if the
brush is "shaped", 8 otherwise.  All numerical fields are in float
format, with a dot as decimal separator, except the number of spikes
(for shaped brushes), which is an integer.
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Non-shaped brushes:

Line 1: Must always contain the magic string "GIMP-VBR".

Line 2: Version number, always "1.0".

Line 3: The name of the brush.  This is a UTF-8 string, with a maximum
        length of 255 bytes.

Line 4: The brush spacing.

Line 5: The brush radius, in pixels.

Line 6: The brush hardness.

Line 7: The brush aspect ratio.

Line 8: The brush angle.


Shaped brushes:

Line 1: Must always contain the magic string "GIMP-VBR".

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Line 2: Version number, always "1.5".
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Line 3: The name of the brush.  This is a UTF-8 string, with a maximum
        length of 255 bytes.

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Line 4: A string giving the shape of the brush.  Currently "circle",
        "square", and "diamond" are supported.  The possible shapes
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        are defined by the GimpBrushGeneratedShape enum in
        core-enums.h.

Line 5: The brush spacing.

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Line 6: The brush radius, in pixels.
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Line 7: The number of spikes for the shape.
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Line 8: The brush hardness.

Line 9: The brush aspect ratio.

Line 10: The brush angle.