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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <math.h>
#include "bitmap.h"
#define _HEADER_SIZE 54 //Fileheader + infoheader
#define IDENTIFIER 0x424d //BM BitMap identifier
//Address Definitions
#define BF_TYPE 0x00
#define BF_SIZE 0x02
#define BF_OFF_BITS 0x0a
#define BI_SIZE 0x0e
#define BI_WIDTH 0x12
#define BI_HEIGHT 0x16
#define BI_BIT_COUNT 0x1c
#define BI_COMPRESSION 0x1e
#define BI_SIZE_IMAGE 0x22
#define BI_CLR_USED 0x2e
#define BI_CLR_IMPORTANT 0x32
#define CHAR_SIZE_X 2 //How many pixels should form one ASCII char?
#define CHAR_SIZE_Y (2 * CHAR_SIZE_X)
const char map[] = {' ', ' ', '.', ',', '`', '-', '~', '"', '*', ':', ';', '<', '!', '/', '?', '%', '&', '=', '$', '#'};
//const char map[] = {' ', '`', '.', ',', ':', ';', '\"', '+', '#', '@'};
//Routine for flipping bytes
//Calculate average
char avg(int argc, char *argv);
//Calculate luminance from rgb_avg
//Order LSB first: BGR
char rgb_avg(uint8_t R, uint8_t G, uint8_t B);
//Select Char based on 1B brightness Value
char calc_char(uint8_t _c, uint8_t _min, uint8_t _max);
int main(int argc, char *argv[])
{
char **ascii_buff;
uint8_t b_max = 0x00;
uint8_t b_min = 0xff;
struct bitmap_pixel_data bitmap;
if(argc != 3)
{
printf("Usage: %s <input> <output>\n", argv[0]);
return 1;
}
bitmap = bitmap_read(argv[1]);
if(bitmap.error)
{
printf("Error reading file\n");
return 1;
}
//Calculate Averages of CHAR_SIZE x CHAR_SIZE blocks
unsigned int size_x,size_y;
size_x = bitmap.x / CHAR_SIZE_X;
size_y = bitmap.y / CHAR_SIZE_Y;
printf("Creating ASCII File %u x %u\n", size_x, size_y);
ascii_buff = malloc(sizeof(*ascii_buff) * size_x);
for (int i = 0; i < size_x; i++)
{
ascii_buff[i] = malloc(sizeof(ascii_buff[i]) * size_y);
}
//Nest thine Lööps
for(int x = 0; x < size_x; x++)
{
for(int y = 0; y < size_y; y++)
{
char b[CHAR_SIZE_X][CHAR_SIZE_Y];
for(int r = 0; r < CHAR_SIZE_Y; r++)
{
int row = y * CHAR_SIZE_Y + r;
for(int c = 0; c < CHAR_SIZE_X; c++)
{
int col = x * CHAR_SIZE_X + c;
//b[c][r] = avg(3, (char*)&bitmap_buff[row][col]);
b[c][r] = rgb_avg(bitmap.R[col][row],bitmap.G[col][row],bitmap.B[col][row]);
}
}
ascii_buff[x][y] = avg(CHAR_SIZE_X * CHAR_SIZE_Y, (char*)&b);
if((uint8_t)ascii_buff[x][y] < b_min)
b_min = ascii_buff[x][y];
if((uint8_t)ascii_buff[x][y] > b_max)
b_max = ascii_buff[x][y];
}
}
printf("Brightness Values: Min: %u Max: %u\n", b_min, b_max);
//Write Output
printf("Opening %s for writing.\n", argv[2]);
FILE *out = fopen(argv[2], "w");
if(!out)
{
printf("Error opening output File. Check writing permissions.\n");
return 1;
}
for(int y = 0; y<size_y; y++)
{
for(int x = 0; x < size_x; x++)
{
fputc( calc_char(ascii_buff[x][y], b_min, b_max) , out);
}
printf(".");
fputc('\n', out);
}
printf("\n");
printf("Finished!\n");
//Cleanup
for(int i = 0; i < size_x; i++)
free (ascii_buff[i]);
free(ascii_buff);
for(int i = 0; i < bitmap.x; i++)
{
free(bitmap.R[i]);
free(bitmap.G[i]);
free(bitmap.B[i]);
}
free(bitmap.R);
free(bitmap.G);
free(bitmap.B);
fclose(out);
return 0;
}//main
char avg(int argc, char *argv)
{
char ret = 0;
uint64_t sum = 0;
for(int i = 0; i < argc; i++)
sum += (uint64_t)argv[i];
ret = (char)(sum / argc);
return ret;
}//avg
char calc_char(uint8_t _c , uint8_t _min, uint8_t _max)
{
float c = (float)(_c) / (_max - _min);
return map [(int)((sizeof(map)-1) * (c))];
}
char rgb_avg(uint8_t R, uint8_t G, uint8_t B)
{
char ret;
ret = sqrt( 0.299*pow(R,2) + 0.587*pow(G,2) + 0.114*pow(B,2) ); //(char)(R+R+B+G+G+G)/6;
return ret;
}
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