# Copyright 2007 Walter Alini, MatÃas Bordese
#
# This file is part of biOps.
#
# biOps is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# biOps is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with biOps; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
#
# Title: Mirroring Operations
#
# Function: imgHorizontalMirroring
# Flips an image about the y axis
#
# Parameters:
# imgdata - The image data.
#
# Returns:
# The horizontal mirrored image.
#
imgHorizontalMirroring <- function(imgdata){
.imgMirroring(imgdata, 'y')
}
# Function: imgVerticalMirroring
# Flips an image about the x axis
#
# Parameters:
# imgdata - The image data.
#
# Returns:
# The vertical mirrored image.
#
imgVerticalMirroring <- function(imgdata){
.imgMirroring(imgdata, 'x')
}
# Function: .imgMirroring
# Flips an image
#
# Parameters:
# imgdata - The image data.
# axis - The axis about mirroring the image: x | y
#
# Returns:
# The mirrored image.
#
.imgMirroring <- function(imgdata, axis='x'){
method <- switch(axis, x='verticalMirroring', y='horizontalMirroring')
if (is.null(method)) stop('Axis should be x or y')
imgmatrix <- array(imgdata) # get linear array image representations
depth <- if (attr(imgdata, "type") == "grey") 1 else dim(imgdata)[3] # get images depth
width <- dim(imgdata)[2]
height <- dim(imgdata)[1]
# call the C function for image operation
res <- .C(method, image=as.integer(imgmatrix),
width=as.integer(width), height=as.integer(height), depth=as.integer(depth),
ret=integer(width * height * depth), PACKAGE="biOps")
imgtype <- if (depth == 1) "grey" else "rgb" # type of the result
imgdim <- c(height, width, if (depth == 3) depth else NULL) # dim of the result
img <- array(res$ret, dim=imgdim) # build the matrix from linear result
imagedata(img, type=imgtype) # build the imagedata
}
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