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[resize] carefully copy over reuseable parts of lastframe #2165

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nick black 2021-09-14 03:18:35 -04:00
parent 39025dd053
commit 55c7cc356d
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1 changed files with 44 additions and 10 deletions
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54
src/lib/render.c
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@ -4,6 +4,49 @@
#include <notcurses/direct.h>
#include "internal.h"
static nccell*
restripe_lastframe(notcurses* nc, int rows, int cols){
assert(rows);
assert(cols);
const size_t size = sizeof(*nc->lastframe) * (rows * cols);
nccell* tmp = malloc(size);
if(tmp == NULL){
return NULL;
}
size_t maxlinecopy = sizeof(nccell) * (nc->lfdimx > cols ? cols : nc->lfdimx);
size_t minlineset = sizeof(nccell) * cols - maxlinecopy;
unsigned zorch = nc->lfdimx > cols ? nc->lfdimx - cols : 0;
for(int y = 0 ; y < rows ; ++y){
if(y < nc->lfdimy){
if(maxlinecopy){
memcpy(&tmp[cols * y], &nc->lastframe[nc->lfdimx * y], maxlinecopy);
}
if(minlineset){
memset(&tmp[cols * y + maxlinecopy / sizeof(nccell)], 0, minlineset);
}
// excise any egcpool entries from the right of the new plane area
if(zorch){
for(unsigned x = maxlinecopy ; x < maxlinecopy + zorch ; ++x){
pool_release(&nc->pool, &nc->lastframe[fbcellidx(y, nc->lfdimx, x)]);
}
}
}else{
memset(&tmp[cols * y], 0, sizeof(nccell) * cols);
}
}
// excise any egcpool entries from below the new plane area
for(int y = rows ; y < nc->lfdimy ; ++y){
for(int x = 0 ; x < nc->lfdimx ; ++x){
pool_release(&nc->pool, &nc->lastframe[fbcellidx(y, nc->lfdimx, x)]);
}
}
free(nc->lastframe);
nc->lastframe = tmp;
nc->lfdimy = rows;
nc->lfdimx = cols;
return 0;
}
// Check whether the terminal geometry has changed, and if so, copy what can
// be copied from the old lastframe. Assumes that the screen is always anchored
// at the same origin. Initiates a resize cascade for the pile containing |pp|.
@ -35,18 +78,9 @@ notcurses_resize_internal(ncplane* pp, int* restrict rows, int* restrict cols){
*cols = 1;
}
if(*rows != n->lfdimy || *cols != n->lfdimx){
n->lfdimy = *rows;
n->lfdimx = *cols;
const size_t size = sizeof(*n->lastframe) * (n->lfdimy * n->lfdimx);
nccell* fb = realloc(n->lastframe, size);
if(fb == NULL){
if(restripe_lastframe(n, *rows, *cols)){
return -1;
}
n->lastframe = fb;
// FIXME more memset()tery than we need, both wasting work and wrecking
// damage detection for the upcoming render
memset(n->lastframe, 0, size);
egcpool_dump(&n->pool);
}
//fprintf(stderr, "r: %d or: %d c: %d oc: %d\n", *rows, oldrows, *cols, oldcols);
if(*rows == oldrows && *cols == oldcols){