#include

#include

using namespace std;

$//$ Function to convert a single pixel to grayscale

short pixelToGrayscale$($short red, short green, short blue$)\{$

$$ return static$\_$cast$(0\mathrm{.}299*$ red $+0\mathrm{.}587*$ green $+0\mathrm{.}114*$ blue$)$;

$\}$

$//$ Function to convert a photo to grayscale

short$*$ photoToGrayscale$($short pixels$[],$ int size$)\{$

$//$ Validate that the size is a multiple of $3($each pixel has red, green, blue components$)$

$$ if $($size $\%3!=0)\{$

$$ return nullptr;

$\}$

$//$ Number of pixels in the image

$$ int numPixels $=$ size $/3$;

$//$ Allocate memory for grayscale pixels

$$ short$*$ grayscalePixels $=$ new short$[$numPixels$]$;

$//$ Convert each pixel to grayscale

$$ for $($int i $=0$; i $$ numPixels; $++$i$)\{$

$$ short red $=$ pixels$[3*$ i$]$;

$$ short green $=$ pixels$[3*$ i $+1]$;

$$ short blue $=$ pixels$[3*$ i $+2]$;

$$ grayscalePixels$[$i$]=$ pixelToGrayscale$($red$,$ green, blue$)$;

$\}$

$$ return grayscalePixels;

$\}$

int main$()\{$

$//$ Open the file "picture" for reading

$$ ifstream inputFile$("$picture$")$;

$$ if $(!$inputFile$)\{$

$$ cout $$ "INVALID" $$ endl;

$$ return $1$;

$\}$

$$ int width, height;

$//$ Read the width and height of the picture

$$ inputFile $>>$ width $>>$ height;

$//$ Validate width and height

$$ if $($width height

$$ cout $$ "INVALID" $$ endl;

$$ return $1$;

$\}$

$//$ Calculate the total size of the pixel data

$$ int size $=$ width $*$ height $*3$;

$$ short$*$ pixels $=$ new short$[$size$]$;

$//$ Read pixel data from the file

$$ for $($int i $=0$; i $$ size; $++$i$)\{$

$$ if $(!($inputFile $>>$ pixels$[$i$]))\{$

$$ cout $$ "INVALID" $$ endl;

$$ delete$[]$ pixels;

$$ return $1$;

$\}$

$\}$

$//$ Close the input file

$$ inputFile.close$()$;

$//$ Convert the photo to grayscale

$$ short$*$ grayscale $=$ photoToGrayscale$($pixels$,$ size$)$;

$//$ If conversion failed, the size was invalid

$$ if $(!$grayscale$)\{$

$$ cout $$ "INVALID" $$ endl;

$$ delete$[]$ pixels;

$$ return $1$;

$\}$

$//$ Print each grayscale value on a new line

$$ int numPixels $=$ size $/3$;

$$ for $($int i $=0$; i $$ numPixels; $++$i$)\{$

$$ cout $$ grayscale$[$i$]$ endl;

$\}$

$//$ Clean up

$$ delete$[]$ pixels;

$$ delete$[]$ grayscale;

$$ return $0$;

$\}$ Question $1$Check CompilationCheck Structure $-$ Check Function ImplementationCheck Structure $-$ Check Function ImplementationCheck Solution $-$ Single red pixel

The expression did not evaluate correctly.

$,$ More information

Hiddson.

Expocted autput:Check Solution $-$ Single green pixelCheck Solution $-$ Single blue pixelCheck Solution $-\backslash (3\backslash$times $3\backslash )$ picture

The expression did not evaluate correctly.

P Mare infornationCheck Solution $-$ Not enough dataCheck Solution $-$ Not enough dataCheck Solution $-$ Too much data $\backslash (\backslash$checkmark $\backslash )$ Question

Goal: Learn how to read an array from a file and process the data. following formula:

$\backslash (0\mathrm{.}299*\backslash )$ red $\backslash (+0\mathrm{.}587*\backslash )$ green $+0\mathrm{.}114*$ blue until the end of the array.

Next, define a phototocrayscale function that takes the short pixels$[]$ array as its first argument and int size as its second argument. To convert this photo to grayscale, you need to:

$-$ Validate that the size is valid. Each pixel is described by three values, so the size must be a multiple of $3.$

$-$ Allocate a new array with enough space to store the grayscale values of the pixels.

$-$ Convert all the pixels to grayscale and store them in the new array.

$-$ Return a pointer to the new array. If the input size is not valid, this function should return nullptr.

Finally, you need to demonstrate this function by using it in a main program that

$-$ Opens a file named picture for reading as input.

$-$ This file contains many values that all fall in the short range and describe a picture.

$-$ The first value in this file is the width of the picture. Read this into a width variable.

$-$ The second value is the height of the picture. Read this into a height variable.

$-$ Use the width and height to determine the size of the picture. Use this size to allocate an array to store the pixel data from the file.

$-$ Read the RGB data from the file and store it in the allocated array.

$-$ If the file does not contain the exact amount of data as indicated by width and height print INVALID to the output and exit.

$-$ Use the photoToGrayscale function to convert the picture to grayscale.

$-$ If the data in picture is valid, print each grayscale value on a new line. Otherwise print INVALID to the output.