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#include "bitmap.h"
uint32_t bitmap_flip_byte(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
struct bitmap_pixel_data bitmap_read(char *_file)
{
struct bitmap_pixel_data ret;
struct bitmap_file_header header;
ret.R = ret.G = ret.B = NULL;
ret.error = 1;
FILE *bitmap;
if(_file)
bitmap = fopen(_file,"rb");
else
bitmap = stdin;
if(!bitmap)
return ret;
header = bitmap_read_file_header(bitmap);
if(header.error)
return ret;
if(header.biBitCount != 24)
return ret;
if(header.biCompression != 0)
return ret;
ret = bitmap_read_pixel_data(bitmap, header);
free(header.tables);
fclose(bitmap);
ret.error = 0;
return ret;
}
struct bitmap_file_header bitmap_read_file_header(FILE *_file)
{
struct bitmap_file_header ret;
unsigned char fileheader[_HEADER_SIZE];
uint32_t read_counter = 0;
ret.error = 1;
size_t tt = fread((void*)&fileheader, sizeof(char), _HEADER_SIZE, _file);
read_counter += _HEADER_SIZE;
if(!tt)
return ret;
//Copy file header
ret.bfType = (uint16_t) bitmap_flip_byte(&fileheader[BF_TYPE], sizeof(ret.bfType));
if(ret.bfType != (uint16_t)IDENTIFIER)
return ret;
ret.bfSize = (uint32_t) bitmap_flip_byte(&fileheader[BF_SIZE], sizeof(ret.bfSize));
ret.bfOffBits = *(uint32_t*) &fileheader[BF_OFF_BITS];
ret.biSize = *(uint32_t*) &fileheader[BI_SIZE];
ret.biWidth = *(int32_t*) &fileheader[BI_WIDTH];
ret.biHeight = *(int32_t*) &fileheader[BI_HEIGHT];
ret.biBitCount = *(uint16_t*) &fileheader[BI_BIT_COUNT];
ret.biCompression = (uint32_t) bitmap_flip_byte(&fileheader[BI_COMPRESSION], sizeof(ret.biCompression));
ret.biSizeImage = *(uint32_t*) &fileheader[BI_SIZE_IMAGE];
ret.biClrUsed = (uint32_t) bitmap_flip_byte(&fileheader[BI_CLR_USED], sizeof(ret.biClrUsed));
ret.biClrImportant = (uint32_t) bitmap_flip_byte(&fileheader[BI_CLR_IMPORTANT], sizeof(ret.biClrImportant));
//Read to start of Pixel block
//This block contains Colormasks and Colortables.
ret.tablesc = ret.bfOffBits - read_counter;
ret.tables = malloc(sizeof(char)* ret.tablesc);
fread(ret.tables, sizeof(char), ret.tablesc, _file);
//////////
ret.error = 0;
return ret;
}
struct bitmap_pixel_data bitmap_read_pixel_data(FILE *_file, struct bitmap_file_header _header)
{
uint32_t **bitmap_buff;
struct bitmap_pixel_data ret;
uint32_t row_size = _header.biWidth * 3;
while(row_size%4)
row_size++;
ret.x = _header.biWidth;
ret.y = _header.biHeight < 0 ? -_header.biHeight: _header.biHeight;
//If biHeight > 0 Data starts with last row!!
//Allocate 2D array
//!!
//bitmap_buff indeces are flipped!! [y][x]!!!!!
bitmap_buff = malloc(sizeof(*bitmap_buff) * _header.biHeight);
for(int i = 0; i < ret.y; i++)
{
bitmap_buff[i] = malloc(sizeof(*bitmap_buff[i]) * _header.biWidth);
}
//Copy Bitmap into bitmap_buff
for(int row = 0; row < _header.biHeight; row++)
{
//printf("Row %i\n", row);
//fread(bitmap_buff[row], sizeof(char), row_size, bitmap);
for(int col = 0; col < _header.biWidth; col++)
fread(&bitmap_buff[row][col], 1, 3, _file);
for(int i = 0; i < row_size - (_header.biWidth * 3); i++) //read excess NULL-Bytes
fgetc(_file);
}
ret.x = _header.biWidth;
ret.y = _header.biHeight < 0 ? -_header.biHeight: _header.biHeight;
ret.R = malloc(sizeof(*ret.R) * ret.x);
ret.G = malloc(sizeof(*ret.G) * ret.x);
ret.B = malloc(sizeof(*ret.B) * ret.x);
for(int i = 0; i < ret.x; i++)
{
ret.R[i] = malloc(sizeof(*ret.R[i]) * ret.y);
ret.G[i] = malloc(sizeof(*ret.G[i]) * ret.y);
ret.B[i] = malloc(sizeof(*ret.B[i]) * ret.y);
}
for(int y = 0; y < ret.y; y++)
{
for(int x = 0; x < ret.x; x++)
{
int row = _header.biHeight > 0 ? (ret.y - 1) - y : y;
ret.R[x][y] = (bitmap_buff[row][x] & 0xff0000)>>16;
ret.G[x][y] = (bitmap_buff[row][x] & 0x00ff00)>>8;
ret.B[x][y] = (bitmap_buff[row][x] & 0x0000ff);
}
}
for(int i = 0; i < ret.y; i++)
free(bitmap_buff[i]);
free(bitmap_buff);
return ret;
}
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