README

//Copyright ILINCA SEBASTIAN-IONUT 311CA

HW 3

FIRST TASK(LOAD)
	After the scan of the command we verify if the program has already a image,
loaded, if the answer is yes we free the memory of the program charged with
the old photo with a function called 'free_that', after that we open the
file with 'rt' to read the magic word, width, height and max value
now it depends on the magic word, the function will split into four
cases (the matrix is color and text/grayscale and text/color and
binary/grayscale and binary). Also I need to mention the need to use cast at
color because I worked with a struct named rgb. The thing is that after I open
a file in text mode I check if it is ascii or binnary. If it is ascii I don't
need to close the file so I continue the way I started. If it is binary, well
I memorise the cursor(Idk if this is the word in english) to that position,
then when I reopen the file I move the cursor to the point which is memorised
and move one more time +1 because at that point there is a '\n' which I need
to pass.

SECOND TASK(SELECT <...>)
	When I load an image I memorise in two vectors the coords (x_c
& y_c) which indicate me where is the working matrix, initially
I have 0 for the 3rd element both on x and y and on the 4th I
have the height, the width. The first two elements are for printing
in the right order. Anyway the way my program is working is based on the fact
that I do all settings, crop, filters based on these coordinates so I need to
put them in the right order.

THIRD TASK(SELECT ALL)
	The working mecanhism is simple, 3rd element of both x and y are 0
now and the 4th element is height, width. This happens of course after a
few functions which verify if the selected area is all, from "SELECT ALL"
or if I will work with the coordinates. Sorry I don't have many words about
this one, it's a simple task.

FOURTH TASK(ROTATE)
	I will talk about color and grayscale at once because of their similarities
in this task. I use properly just the 90 degrees rotate because if it's 180
I apply rotate 90 twice, for the 270 degrees rotate I apply it twice and so on.
When the matrix is not a square and it allows me to enter the function I am
sure that it s the whole photo, so I make it a square, transpose it, and swap
the columns. Also here I need to mention that after the transpose I swapped the
x, y, height and width, after that I swapped the columns from 0 to the right
elements swapped, because if I take the garbage when I transformed the photo
into a square it would be a mess.

FIFTH TASK(CROP)
	The idea is simple, make a copy of the 'working matrix', free the main
matrix, put the right new x, y, height and width. After that, the program alloc
memory for the 'main' new matrix accordingly of the coordinates and copy the
values from the 'buffer' matrix. After that, I set the new height and width
and I put the right values of the new coordinates.

SIXTH TASK(APPLY <...>)
	Complete all the verifications to make sure that the image is color,
is any image at all, the parameter is valid. After that I copy the values of
rgb in the following: matrix r, matrix g, matrix b(mr, mg, mb). After that with
two of for syntaxes I checked if the pixel can be modified and if it can be
I start doing the calculus. One functions calculate all of the filters, but
depending of what filter I have (accordingly with a number sent by parameter
to decide what filter I need). After that I put in order values obtained in mr,
mg and mb. I need to mention that the approximations will be made at the
command SAVE.

SEVENTH TASK(SAVE)
	Depending if the save will be ascii or not, we edit the magic word.
After that we print in the file magic word, the width, the height and the max
value in ascii mode, then we'll decide accordingly with the magic word if we
continue to write in text mode or binary. At the color image, I approximate
and cast the int in an unsigned char, after that I print
binary or text. This is because of the really strange approximations.
This task and the apply tasks were the most difficult.(OH NO... I have one hour
left...hope I'll make it in time)

EIGHTH TASK(EXIT)
	I use the same function for free the image loaded in the program,
after that I free the strings and break the while. If the program doesn't have
 any image loaded, it will not exit anything and show a message to inform you.
Unfortunately I don't havemany words about EXIT, I hope it's okay.

That's my homework, thanks for reading.:) <3