BMP Image Library

This library provides functionalities for manipulating BMP images. It allows for basic image operations such as: saving and editing images, inserting one image into another, setting brush properties, and drawing shapes including dots, lines, rectangles, and triangles.

BMP Image Structure

The BMP image format is characterized by its simplicity and comprises mainly two parts: a file header and an info header, followed by the actual pixel data (bitmap).

File Header (bmp_fileheader)

• Signature: 2 bytes ('B' and 'M' in ASCII) indicating the BMP file format.
• File Size: 4 bytes representing the total size of the file.
• Reserved: 4 bytes (2 fields of 2 bytes each) unused and application-specific.
• Image Data Offset: 4 bytes specifying the offset to the start of the image data (pixel matrix).

Info Header (bmp_infoheader)

• Size: 4 bytes indicating the size of the info header, fixed at 40 bytes.
• Width: 4 bytes for the width of the image (number of columns).
• Height: 4 bytes for the height of the image (number of rows).
• Planes: 2 bytes set to the fixed value of 1.
• Bit Count: 2 bytes for the number of bits per pixel, always set to 24 in this project, meaning each pixel is represented by 3 bytes (RGB channels).
• Compression: 4 bytes for the type of compression, which will be 0 (no compression).
• Image Size: 4 bytes referring to the size of the pixel matrix, including any added padding.
• X Pixels Per Meter: 4 bytes for the horizontal print resolution, set to 0 for simplification.
• Y Pixels Per Meter: 4 bytes for the vertical print resolution, also set to 0.
• Colors Used: 4 bytes for the number of colors in the color palette, set to 0 (not used in this project).
• Colors Important: 4 bytes for the number of important colors, set to 0, implying all colors are important.

Pixel Matrix

The pixel data is stored in a matrix of height x width, but may include padding at the end of each row to ensure that each line starts at a 4-byte boundary. This padding should be ignored during reading and explicitly set to 0 during writing. Note: the pixel data is stored in reverse order, with the first row of the matrix actually representing the bottom line of the image. The color channels for each pixel are in BGR (Blue, Green, Red) order.

Image Manipulation

• SAVE (char *file, BMP *bmp): Saves the modified BMP image to a file.
• EDIT (char *file, BMP *bmp): Loads a BMP image from a file, allowing it to be edited or manipulated.
• INSERT (char *file, BMP *bmp, int y, int x): Inserts another BMP image into the current BMP structure at the specified position.
• FILL (BMP *bmp, int y, int x): Fills an area of the BMP image with the current brush color, starting from the specified coordinates.
• SET_COLOR (BMP *bmp, u_int8_t R, u_int8_t G, u_int8_t B): Sets the brush color in the BMP image for subsequent drawing or filling operations.
• SET_LINE (BMP *bmp, u_int8_t brush_size): Sets the brush size for drawing operations on the BMP image.

Shape Drawing

• DOT (BMP *bmp, int y1, int x1): Draws a dot at the specified coordinates on the BMP image, using the currently set brush size and color.
• LINE (BMP *bmp, int y1, int x1, int y2, int x2): Draws a line between two points on the BMP image, using the currently set brush size and color.
• RECTANGLE (BMP *bmp, int y1, int x1, int width, int height): Purpose: Draws a filled rectangle on the BMP image, using the currently set brush color.
• TRIANGLE (BMP *bmp, int y1, int x1, int y2, int x2, int y3, int x3): Draws a filled triangle on the BMP image, connecting three specified points with the currently set brush color.

Build the Project

1. Navigate to the build directory.
2. Run the make command to build the executable.

The Makefile provided will compile the source files and link them with the necessary libraries.

    cd ./build
    make

Run the Project

After building the project, you can run the program with the shell script temple_run.sh to execute the program. This script sets up the necessary environment and arguments for the program to run the test suite.

    ./bmp_run.sh
    ............................Basic Commands.........................
    Test 0.......................................................passed
    Test valgrind................................................passed
    
    ............................Insert Image...........................
    Test 0.......................................................passed
    Test valgrind................................................passed
    Test 1.......................................................passed
    Test valgrind................................................passed
    Test 2.......................................................passed
    Test valgrind................................................passed
    Test 3.......................................................passed
    Test valgrind................................................passed
    Test 4.......................................................passed
    Test valgrind................................................passed

    ............................Draw Commands..........................
    Test 0.......................................................passed
    Test valgrind................................................passed
    Test 1.......................................................passed
    Test valgrind................................................passed
    Test 2.......................................................passed
    Test valgrind................................................passed
    Test 3.......................................................passed
    Test valgrind................................................passed
    
    ............................Fill Color.............................
    Test 0.......................................................passed
    Test valgrind................................................passed
    Test 1.......................................................passed
    Test valgrind................................................passed
    Test 2.......................................................passed
    Test valgrind................................................passed
    
    ............................Mix Commands...........................
    Test 0.......................................................passed
    Test valgrind................................................passed
    Test 1.......................................................passed
    Test valgrind................................................passed
    Test 2.......................................................passed
    Test valgrind................................................passed
    Test 3.......................................................passed
    Test valgrind................................................passed
    Test 4.......................................................passed
    Test valgrind................................................passed