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#include <errno.h>
#include <stdlib.h>
#include <buchstabensuppe/flipdot.h>
bool bs_scroll_next_view(bs_view_t *view, int step, enum bs_dimension dim) {
if(step == 0) {
return true;
}
int bitmap_len, len;
int *offset;
switch(dim) {
case BS_DIMENSION_Y:
bitmap_len = view->bs_view_bitmap.bs_bitmap_height;
offset = &(view->bs_view_offset_y);
len = view->bs_view_width;
break;
case BS_DIMENSION_X: /* is also default case */
default:
bitmap_len = view->bs_view_bitmap.bs_bitmap_width;
offset = &(view->bs_view_offset_x);
len = view->bs_view_height;
break;
}
if(step > 0 && *offset >= bitmap_len) {
*offset = -len;
return true;
} else if(step < 0 && *offset <= -len) {
*offset = bitmap_len;
return true;
} else {
*offset = *offset + step;
}
return false;
}
bool bs_page_next_view(bs_view_t *view, int dir, enum bs_dimension dim) {
if(dir == 0) {
return true;
}
int bitmap_len, len;
int *offset;
switch(dim) {
case BS_DIMENSION_Y:
bitmap_len = view->bs_view_bitmap.bs_bitmap_height;
offset = &(view->bs_view_offset_y);
len = view->bs_view_width;
break;
case BS_DIMENSION_X: /* is also default case */
default:
bitmap_len = view->bs_view_bitmap.bs_bitmap_width;
offset = &(view->bs_view_offset_x);
len = view->bs_view_height;
break;
}
if(dir > 0 && *offset + len >= bitmap_len) {
*offset = 0;
return true;
} else if(dir < 0 && *offset <= 0) {
*offset = bitmap_len - len;
return true;
} else {
*offset = *offset + dir * len;
}
return false;
}
int bs_flipdot_render(int sockfd, struct sockaddr *addr, socklen_t addrlen, bs_view_t view, unsigned char overflow_color) {
size_t bits_size;
uint8_t *bits = bs_view_bitarray(view, &bits_size, overflow_color);
if(bits == NULL) {
errno = ENOMEM;
return -1;
}
ssize_t sent = sendto(sockfd, bits, bits_size, 0, addr, addrlen);
free(bits);
if(sent != (ssize_t) bits_size) {
return -1;
}
return 0;
}
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