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#include "ff.h"
#include "../io/io.h"
#include "../cstr/cstr.h"
#include "../malloc/malloc.h"
#define MAGIC_VALUE "farbfeld"
u32 conv_to_int(u32 src)
{
return ((src & 0xff) << 24) | ((src & 0xff00) << 8) | ((src & 0xff0000) >> 8) | ((src & 0xff000000) >> 24);
}
u32 read_u32_from_fd(int fd)
{
u32 src;
read(fd, (char *)&src, 4);
return ((src & 0xff) << 24) | ((src & 0xff00) << 8) | ((src & 0xff0000) >> 8) | ((src & 0xff000000) >> 24);
}
image_t *new_image_from_fd(int fd)
{
image_t *img = malloc(sizeof(image_t));
char magic[9] = { 0 };
read(fd, magic, 8);
if (cstr_compare(magic, MAGIC_VALUE) != 0) {
free(img);
return 0;
}
img->width = read_u32_from_fd(fd);
img->height = read_u32_from_fd(fd);
if (img->width * img->height == 0) {
free(img);
return 0;
}
img->data = malloc(sizeof(image_pixel_t) * img->width * img->height);
u64 s = 0;
u64 rs = 0;
while ((rs = read(fd, (char*)(img->data) + s, sizeof(image_pixel_t) * img->width * img->height - s))) {
s += rs;
}
return img;
}
void free_image(image_t *img)
{
free(img->data);
free(img);
}
canvas_pixel_t image_pixel_to_canvas_pixel(image_pixel_t p)
{
canvas_pixel_t cp;
cp.r = p.r;
cp.g = p.g;
cp.b = p.b;
cp.a = p.a;
cp.r = (long double)(cp.r) * ((long double)(p.a) / 0xffff);
cp.g = (long double)(cp.g) * ((long double)(p.a) / 0xffff);
cp.b = (long double)(cp.b) * ((long double)(p.a) / 0xffff);
return cp;
}
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