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| // Добавить альфа канал в BMP
// Описание формата BMP: [url]http://ru.wikipedia.org/wiki/BMP[/url]
#include <stdio.h>
#include <windows.h>
struct pixel_rgba
{
public:
BYTE b;
BYTE g;
BYTE r;
BYTE a;
};
struct pixel_rgb
{
public:
BYTE b;
BYTE g;
BYTE r;
};
int main()
{
BITMAPFILEHEADER bmp_header;
BITMAPINFOHEADER info_header;
int i;
unsigned char y;
FILE *f;
FILE *g;
f = fopen("wood_100x100.bmp", "rb");
g = fopen("wood_100x100rgba.bmp", "wb");
fseek(f, 0 , SEEK_SET);
// SEEK_SET на начало файла
// SEEK_CUR текущая позиция
fread(&bmp_header, 1, sizeof(BITMAPFILEHEADER), f);
printf("sizeof(BITMAPFILEHEADER) : %x %d\n",
sizeof(BITMAPFILEHEADER), sizeof(BITMAPFILEHEADER));
fseek(g, 0 , SEEK_SET);
fwrite(&bmp_header, 1, sizeof(BITMAPFILEHEADER), g);
int dr = bmp_header.bfOffBits - sizeof(BITMAPFILEHEADER);
printf("dr: %d\n", dr);
if (dr == 40)
{
fseek(g, sizeof(BITMAPFILEHEADER), SEEK_SET);
fread(&info_header, 1, sizeof(BITMAPINFOHEADER), f);
info_header.biSize = sizeof(BITMAPINFOHEADER);
printf("info_header.biSize: %x\n", info_header.biSize);
printf("info_header.biWidth: %d\n", info_header.biWidth);
printf("info_header.biHeight: %d\n", info_header.biHeight);
printf("info_header.biPlanes: %d\n", info_header.biPlanes);
printf("info_header.biBitCount: %d\n", info_header.biBitCount);
printf("info_header.biCompression: %d\n", info_header.biCompression);
printf("info_header.biSizeImage: %d\n", info_header.biSizeImage);
printf("info_header.biXPelsPerMeter: %d\n", info_header.biXPelsPerMeter);
printf("info_header.biYPelsPerMeter: %d\n", info_header.biYPelsPerMeter);
printf("info_header.biClrUsed: %d\n", info_header.biClrUsed);
printf("info_header.biClrImportant: %d\n", info_header.biClrImportant);
info_header.biBitCount = 32;
fseek(g, sizeof(BITMAPFILEHEADER) , SEEK_SET);
fwrite(&info_header, 1, sizeof(BITMAPINFOHEADER), g);
}
printf("bmp_header.bfType: %x\n", bmp_header.bfType);
printf("bmp_header.bfSize: %x\n", bmp_header.bfSize);
printf("bmp_header.bfReserved1: %x\n", bmp_header.bfReserved1);
printf("bmp_header.bfReserved2: %x\n", bmp_header.bfReserved2);
printf("bmp_header.bfOffBits: %x\n", bmp_header.bfOffBits);
printf("sizeof(BITMAPFILEHEADER) : %x %d\n", sizeof(BITMAPFILEHEADER), sizeof(BITMAPFILEHEADER));
printf("sizeof(BITMAPV4HEADER) : %x %d\n", sizeof(BITMAPV4HEADER), sizeof(BITMAPV4HEADER));
printf("sizeof(BITMAPV5HEADER) : %x %d\n", sizeof(BITMAPV5HEADER), sizeof(BITMAPV5HEADER));
// перебор пикселей изображения
int offset;
int offset2;
int j = 0;
int h = sizeof(pixel_rgb);
printf("sizeof(pixel_rgb) : %x %d\n", sizeof(pixel_rgb), sizeof(pixel_rgb));
pixel_rgb rt;
pixel_rgba rt2;
// условие остановки
while(bmp_header.bfOffBits + j * sizeof(pixel_rgb) < bmp_header.bfSize)
{
offset = bmp_header.bfOffBits + j * sizeof(pixel_rgb);
offset2 = bmp_header.bfOffBits + j * sizeof(pixel_rgba);
fseek(f, offset , SEEK_SET);
fread(&rt, 1, sizeof(pixel_rgb), f);
rt2.b = rt.b;
rt2.g = rt.g;
rt2.r = rt.r;
if (rt.b == 255 && rt.g == 255 && rt.r == 255)
rt2.a = 255;
else
rt2.a = 0;
printf("%x %x %x ", rt.b, rt.g, rt.r);
fseek(g, offset2 , SEEK_SET);
fwrite(&rt2, 1, sizeof(pixel_rgba), g);
j++;
}
fclose(f);
fclose(g);
return 0;
} |
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