diff options
Diffstat (limited to 'main.c')
| -rw-r--r-- | main.c | 152 |
1 files changed, 13 insertions, 139 deletions
@@ -3,6 +3,8 @@ #include <stdint.h> #include <math.h> +#include "bitmap.h" + #define _HEADER_SIZE 54 //Fileheader + infoheader #define IDENTIFIER 0x424d //BM BitMap identifier @@ -27,41 +29,25 @@ const char map[] = {' ', ' ', '.', ',', '`', '-', '~', '"', '*', ':', ';', '<', '!', '/', '?', '%', '&', '=', '$', '#'}; //const char map[] = {' ', '`', '.', ',', ':', ';', '\"', '+', '#', '@'}; //Routine for flipping bytes -uint32_t flip(unsigned char* _v, int _c); //Calculate average char avg(int argc, char *argv); //Calculate luminance from rgb_avg //Order LSB first: BGR -char rgb_avg(uint32_t *arg); +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[]) { - unsigned char fileheader[_HEADER_SIZE]; - unsigned char *tables; - uint32_t **bitmap_buff; char **ascii_buff; - uint32_t read_counter = 0; uint8_t b_max = 0x00; uint8_t b_min = 0xff; - uint16_t bfType = 0; - uint32_t bfSize = 0; - uint32_t bfOffBits = 0; - - uint32_t biSize = 0; - int32_t biWidth = 0; - int32_t biHeight = 0; - uint16_t biBitCount = 0; - uint32_t biCompression = 0; - uint32_t biSizeImage = 0; - uint32_t biClrUsed = 0; - uint32_t biClrImportant = 0; + struct bitmap_pixel_data bitmap; if(argc != 3) { @@ -69,111 +55,18 @@ int main(int argc, char *argv[]) return 1; } - printf("Opening %s\n", argv[1]); - - FILE *bitmap; - bitmap = fopen(argv[1], "r"); + bitmap = bitmap_read(argv[1]); - if(bitmap==NULL) + if(bitmap.error) { - printf("Error opening file. Abort.\n"); + printf("Error reading file"); return 1; } - size_t tt = fread((void*)&fileheader, sizeof(char), _HEADER_SIZE, bitmap); - read_counter += _HEADER_SIZE; - - if(!tt) - { - printf("Error reading file. Abort.\n"); - return 1; - } - - //Copy file header - bfType = (uint16_t) flip(&fileheader[BF_TYPE], sizeof(bfType)); - - if(bfType != (uint16_t)IDENTIFIER) - { - printf("%s is not a valid Bitmap. Abort.\n", argv[1]); - fclose(bitmap); - return 1; - } - - bfSize = (uint32_t) flip(&fileheader[BF_SIZE], sizeof(bfSize)); - bfOffBits = *(uint32_t*) &fileheader[BF_OFF_BITS]; - biSize = *(uint32_t*) &fileheader[BI_SIZE]; - biWidth = *(int32_t*) &fileheader[BI_WIDTH]; - biHeight = *(int32_t*) &fileheader[BI_HEIGHT]; - biBitCount = *(uint16_t*) &fileheader[BI_BIT_COUNT]; - biCompression = (uint32_t) flip(&fileheader[BI_COMPRESSION], sizeof(biCompression)); - biSizeImage = *(uint32_t*) &fileheader[BI_SIZE_IMAGE]; - biClrUsed = (uint32_t) flip(&fileheader[BI_CLR_USED], sizeof(biClrUsed)); - biClrImportant = (uint32_t) flip(&fileheader[BI_CLR_IMPORTANT], sizeof(biClrImportant)); - - printf("Picture is %u x %u Pixels. Colordepth: %ubit. Size: %uB\n",biWidth, biHeight, biBitCount, biSizeImage); - - if(biBitCount !=24) - { - printf("%ubit mode not supported.\n", biBitCount); - return 1; - } - if(biCompression != 0) - { - printf("Compression not supported.\n"); - return 1; - } - if(biClrUsed != 0) - { - printf("Colortable not supported.\n"); - return 1; - } - - //Read to start of Pixel block - //This block contains Colormasks and Colortables. - //Unused - uint32_t haeder_end = bfOffBits - read_counter; - tables = malloc(sizeof(char)* haeder_end); - fread(tables, sizeof(char), haeder_end, bitmap); - read_counter += haeder_end; - printf("Data starts at %x\n", read_counter); - - //One pixel is 3Byte, One line is multiple of 4Bytes - uint32_t row_size = biWidth * 3; - while(row_size%4) - row_size++; - - printf("Set row reading size to %uB\n", row_size); - //If biHeight > 0 Data starts with last row!! - - //Allocate 2D array - //!! - //bitmap_buff indeces are flipped!! [y][x]!!!!! - bitmap_buff = malloc(sizeof(*bitmap_buff) * biHeight); - for(int i = 0; i < biHeight; i++) - { - bitmap_buff[i] = malloc(sizeof(*bitmap_buff[i]) * biWidth); - } - - //Copy Bitmap into bitmap_buff - for(int row = 0; row < biHeight; row++) - { - //printf("Row %i\n", row); - //fread(bitmap_buff[row], sizeof(char), row_size, bitmap); - for(int col = 0; col < biWidth; col++) - fread(&bitmap_buff[row][col], 1, 3, bitmap); - - for(int i = 0; i < row_size - (biWidth * 3); i++) //read excess NULL-Bytes - fgetc(bitmap); - - read_counter += row_size; - } - - printf("Finished copying Bitmap\n"); - //Calculate Averages of CHAR_SIZE x CHAR_SIZE blocks unsigned int size_x,size_y; - size_x = biWidth / CHAR_SIZE_X; - size_y = biHeight / CHAR_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); @@ -197,7 +90,7 @@ int main(int argc, char *argv[]) { int col = x * CHAR_SIZE_X + c; //b[c][r] = avg(3, (char*)&bitmap_buff[row][col]); - b[c][r] = rgb_avg(&bitmap_buff[row][col]); + b[c][r] = rgb_avg(bitmap.R[col][row],bitmap.G[col][row],bitmap.B[col][row]); } } @@ -222,7 +115,7 @@ int main(int argc, char *argv[]) return 1; } - for(int y = size_y; y >= 0; y--) + for(int y = 0; y<size_y; y++) { for(int x = 0; x < size_x; x++) { @@ -236,33 +129,17 @@ int main(int argc, char *argv[]) printf("Finished!\n"); //Cleanup - for(int i = 0; i < biHeight; i++) - free (bitmap_buff[i]); - free(bitmap_buff); + for(int i = 0; i < size_y; i++) free (ascii_buff[i]); free(ascii_buff); - fclose(bitmap); fclose(out); return 0; }//main -uint32_t flip(unsigned char* _v, int _c) -{ - uint32_t ret = 0; - uint32_t counter = (_c-1) * 8; - - for(int i = 0; i < _c; i++) - { - ret |= (uint32_t)(_v[i] << (counter)); - counter -= 8; - } - - return ret; -}//flip char avg(int argc, char *argv) { @@ -283,12 +160,9 @@ char calc_char(uint8_t _c , uint8_t _min, uint8_t _max) return map [(int)((sizeof(map)-1) * (c))]; } -char rgb_avg(uint32_t *arg) +char rgb_avg(uint8_t R, uint8_t G, uint8_t B) { char ret; - uint32_t R = (*arg & 0xff0000)>>16;; - uint32_t G = (*arg & 0x00ff00)>>8; - uint32_t B = *arg & 0x0000ff; 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; |