/usr/share/std_msgs/msg/MultiArrayLayout.msg is in ros-std-msgs 0.5.11-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | # The multiarray declares a generic multi-dimensional array of a
# particular data type. Dimensions are ordered from outer most
# to inner most.
MultiArrayDimension[] dim # Array of dimension properties
uint32 data_offset # padding elements at front of data
# Accessors should ALWAYS be written in terms of dimension stride
# and specified outer-most dimension first.
#
# multiarray(i,j,k) = data[data_offset + dim_stride[1]*i + dim_stride[2]*j + k]
#
# A standard, 3-channel 640x480 image with interleaved color channels
# would be specified as:
#
# dim[0].label = "height"
# dim[0].size = 480
# dim[0].stride = 3*640*480 = 921600 (note dim[0] stride is just size of image)
# dim[1].label = "width"
# dim[1].size = 640
# dim[1].stride = 3*640 = 1920
# dim[2].label = "channel"
# dim[2].size = 3
# dim[2].stride = 3
#
# multiarray(i,j,k) refers to the ith row, jth column, and kth channel.
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