Asciify.psm1
|
# Copyright 2019 Tobias Heilig # # Redistribution and use in source and binary forms, with or without modification, are # permitted provided that the following conditions are met: # # 1. Redistributions of source code must retain the above copyright notice, this list # of conditions and the following disclaimer. # 2. Redistributions in binary form must reproduce the above copyright notice, this list # of conditions and the following disclaimer in the documentation and/or other materials # provided with the distribution. # 3. Neither the name of the copyright holder nor the names of its contributors may be used # to endorse or promote products derived from this software without specific prior written # permission. # # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY # AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER # IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT # OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. #requires -version 5 using namespace System.Drawing Add-Type -AssemblyName System.Drawing <# .SYNOPSIS Convert image to ascii. .DESCRIPTION Convert any image to ascii picture by representing each pixels grayscale value as an ascii character. The higher the grayscale value the more space the corresponding ascii character fills. Before being processed the image will be cropped in memory to fit the consoles width or height. .PARAMETER Path The path to the image to process. .PARAMETER Resolution The amount of different ascii characters the grayscale values will be assigned to. The bigger the console window and the smaller the font size a higher resolution tends to look better when the image is also of high resolution. .PARAMETER Width Set the width of the output ascii picture manually. .PARAMETER Height Set the height of the output ascii picture manually. .PARAMETER FitConsoleHeight Whether the output ascii picture should fit the console height instead of width. Only applicable if width and height are not explicitly specified. .PARAMETER Invert Whether the output ascii picture should be inverted. Use this on light console backgrounds for better results. .OUTPUTS A string of ascii characters representing each pixels grayscale value from the original image. Each pixel row is separated by a newline character. .COMPONENT GDI+ .EXAMPLE Convert-ImageToAscii C:\Users\Bobby\Pictures\bobby-fischer.jpg .EXAMPLE Convert-ImageToAscii -Path C:\Users\Bobby\Pictures\bobby-fischer.jpg -Resolution Mid -FitConsoleHeight .EXAMPLE Convert-ImageToAscii -Path C:\Users\Bobby\Pictures\bobby-fischer.jpg -Width 120 -Height 80 -Invert #> function Convert-ImageToAscii { [CmdletBinding()] param( [Parameter(Mandatory=$true, Position=0)] [ValidateScript({Test-Path $_})] [string] $Path, [ValidateSet('Low', 'Mid', 'High')] [string] $Resolution='Low', [Parameter(Mandatory=$true, ParameterSetName="SetDimensionsManually")] [ValidateRange(1, [int]::MaxValue)] [int] $Width, [Parameter(Mandatory=$true, ParameterSetName="SetDimensionsManually")] [ValidateRange(1, [int]::MaxValue)] [int] $Height, [Parameter(ParameterSetName="SetDimensionsAutomatically")] [switch] $FitConsoleHeight, [switch] $Invert ) $img = [Image]::FromFile($(Resolve-Path -Path $Path)) if ($PSCmdlet.ParameterSetName -eq 'SetDimensionsManually') { [int]$w = $Width/2 [int]$h = $Height } else { if (-not $Host.UI.RawUI.WindowSize) { throw "Couldn't determine console width and height due to your current PowerShell host not reporting its dimensions. " + "Are you running this script from within PowerShell ISE? Try setting -Width and -Height manually or switch to " + "a conventional PowerShell console." } if (-not $FitConsoleHeight) { [int]$w = $Host.UI.RawUI.WindowSize.Width/2 - 1 [int]$h = $Host.UI.RawUI.WindowSize.Width/2/($img.Width/$img.Height) } else { [int]$w = $Host.UI.RawUI.WindowSize.Height*($img.Width/$img.Height) [int]$h = $Host.UI.RawUI.WindowSize.Height - 4 } } $bmp = New-Object Bitmap $w, $h $bmp.SetResolution($img.HorizontalResolution, $img.VerticalResolution) $rec = New-Object Rectangle 0, 0, $w, $h $wrapMode = New-Object Imaging.ImageAttributes $wrapMode.SetWrapMode([Drawing2D.WrapMode]::TileFlipXY) $graphics = [Graphics]::FromImage($bmp) $graphics.CompositingMode = [Drawing2D.CompositingMode]::SourceCopy $graphics.CompositingQuality = [Drawing2D.CompositingQuality]::HighQuality $graphics.InterpolationMode = [Drawing2D.InterpolationMode]::HighQualityBicubic $graphics.SmoothingMode = [Drawing2D.SmoothingMode]::HighQuality $graphics.PixelOffsetMode = [Drawing2D.PixelOffsetMode]::HighQuality $graphics.DrawImage($img, $rec, 0, 0, $img.Width, $img.Height, [GraphicsUnit]::Pixel, $wrapMode) $chars = @{ 'Low' = " .+#@" 'Mid' = " .,:+*#%@" 'High' = " .,:;~+?txXCmo#%@" } $symbols = $chars[$Resolution] if ($Invert) { $symbols = $symbols.ToCharArray() [array]::Reverse($symbols) $symbols = -join($symbols) } foreach ($y in 0..($bmp.Height-1)) { foreach ($x in 0..($bmp.Width-1)) { $p = $bmp.GetPixel($x, $y) $symbol = "$($symbols[[Math]::Floor((($p.R+$p.G+$p.B)/3)/(256/$symbols.Length))])" * 2 $ascii += $symbol } $ascii += "`n" } $ascii $wrapMode.Dispose() $graphics.Dispose() $img.Dispose() } New-Alias -Name i2a -Value Convert-ImageToAscii |