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[whiteout] extract dostring(), cleaning up main a bit #2364

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nick black 2021-11-22 07:40:33 -05:00
parent 4d4487d7b4
commit 6a72035184
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GPG Key ID: 5F43400C21CBFACC
1 changed files with 62 additions and 49 deletions
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111
src/demo/whiteout.c
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@ -215,6 +215,57 @@ message(struct ncplane* n, int maxy, int maxx, int num, int total,
return 0;
}
// print the EGCs of the UTF8 string on the standard plane, wrapping around
// the borders. the plane is not set to scroll, so we handle it ourselves.
static int
dostring(struct ncplane* n, const char** s, uint32_t rgb,
unsigned maxy, unsigned maxx,
unsigned* egcs, unsigned* cols, unsigned* bytes){
size_t idx = 0;
unsigned y, x;
ncplane_cursor_yx(n, &y, &x);
while((*s)[idx]){ // each multibyte char of string
if(ncplane_set_fg_rgb8(n, ncchannel_r(rgb), ncchannel_g(rgb), ncchannel_b(rgb))){
return -1;
}
if(x >= maxx){
x = 0;
++y;
}
if(y >= maxy){
break;
}
wchar_t wcs;
mbstate_t mbstate;
memset(&mbstate, 0, sizeof(mbstate));
int eaten = mbrtowc(&wcs, &(*s)[idx], MB_CUR_MAX + 1, &mbstate);
if(eaten < 0){
return -1;
}
if(iswspace(wcs)){
idx += eaten;
continue;
}
size_t ulen = 0;
int r;
if(wcwidth(wcs) <= (int)(maxx - x)){
if((r = ncplane_putegc(n, &(*s)[idx], &ulen)) <= 0){
return -1;
}
}else{
if((r = ncplane_putchar(n, '#')) < 1){
return -1;
}
}
ncplane_cursor_yx(n, &y, &x);
idx += ulen;
*bytes += ulen;
*cols += r;
++*egcs;
}
return 0;
}
// Much of this text comes from http://kermitproject.org/utf8.html
int witherworm_demo(struct notcurses* nc){
static const char* strs[] = {
@ -468,64 +519,26 @@ int witherworm_demo(struct notcurses* nc){
const int start = starts[i];
int step = steps[i];
nccell_init(&c);
unsigned y, x;
unsigned maxy, maxx;
ncplane_dim_yx(n, &maxy, &maxx); // might resize
int rgb = start;
int bytes_out = 0;
int egcs_out = 0;
int cols_out = 0;
y = 1;
x = 0;
uint32_t rgb = start;
unsigned bytes_out = 0;
unsigned egcs_out = 0;
unsigned cols_out = 0;
unsigned y = 1;
unsigned x = 0;
if(ncplane_cursor_move_yx(n, y, x)){
return -1;
}
ncplane_set_bg_rgb8(n, 20, 20, 20);
do{ // we fill up the screen, however large, bouncing around our strtable
s = strs + rand() % ((sizeof(strs) / sizeof(*strs)) - 1);
size_t idx = 0;
ncplane_cursor_yx(n, &y, &x);
while((*s)[idx]){ // each multibyte char of string
if(ncplane_set_fg_rgb8(n, ncchannel_r(rgb), ncchannel_g(rgb), ncchannel_b(rgb))){
return -1;
}
if(x >= maxx){
x = 0;
++y;
}
if(y >= maxy){
break;
}
wchar_t wcs;
mbstate_t mbstate;
memset(&mbstate, 0, sizeof(mbstate));
int eaten = mbrtowc(&wcs, &(*s)[idx], MB_CUR_MAX + 1, &mbstate);
if(eaten < 0){
return -1;
}
if(iswspace(wcs)){
idx += eaten;
continue;
}
size_t ulen = 0;
int r;
if(wcwidth(wcs) <= (int)(maxx - x)){
if((r = ncplane_putegc(n, &(*s)[idx], &ulen)) <= 0){
return -1;
}
}else{
if((r = ncplane_putchar(n, '#')) < 1){
return -1;
}
}
ncplane_cursor_yx(n, &y, &x);
idx += ulen;
bytes_out += ulen;
cols_out += r;
++egcs_out;
if(dostring(n, s, rgb, maxy, maxx, &egcs_out, &cols_out, &bytes_out)){
return -1;
}
rgb += step;
}while(y < maxy);
ncplane_cursor_yx(n, &y, &x);
}while(y < (maxy - 1) || x < (maxx - 2));
struct ncplane* math = mathplane(nc);
if(math == NULL){
return -1;
@ -542,7 +555,7 @@ int witherworm_demo(struct notcurses* nc){
return -1;
}
if(message(mess, maxy, maxx, i, sizeof(steps) / sizeof(*steps),
bytes_out, egcs_out, cols_out)){
bytes_out, egcs_out, cols_out)){
ncplane_destroy(math); ncplane_destroy(mess);
return -1;
}