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restripe_lastframe: properly index into tmp/lastframe

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nick black 2021-09-16 00:07:47 -04:00
parent bfdd5dd01d
commit 5a64f25ac2
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GPG Key ID: 5F43400C21CBFACC
1 changed files with 8 additions and 3 deletions
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11
src/lib/render.c
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@ -4,6 +4,10 @@
#include <notcurses/direct.h>
#include "internal.h"
// update for a new visual area of |rows|x|cols|, neither of which may be zero.
// copies that area of the lastframe (damage map) which is shared between the
// two. new areas are initialized to empty, just like a new plane. lost areas
// have their egcpool entries purged.
static nccell*
restripe_lastframe(notcurses* nc, int rows, int cols){
assert(rows);
@ -13,7 +17,8 @@ restripe_lastframe(notcurses* nc, int rows, int cols){
if(tmp == NULL){
return NULL;
}
size_t maxlinecopy = sizeof(nccell) * (nc->lfdimx > cols ? cols : nc->lfdimx);
size_t copycols = nc->lfdimx > cols ? cols : nc->lfdimx;
size_t maxlinecopy = sizeof(nccell) * copycols;
size_t minlineset = sizeof(nccell) * cols - maxlinecopy;
unsigned zorch = nc->lfdimx > cols ? nc->lfdimx - cols : 0;
for(int y = 0 ; y < rows ; ++y){
@ -22,11 +27,11 @@ restripe_lastframe(notcurses* nc, int rows, int cols){
memcpy(&tmp[cols * y], &nc->lastframe[nc->lfdimx * y], maxlinecopy);
}
if(minlineset){
memset(&tmp[cols * y + maxlinecopy / sizeof(nccell)], 0, minlineset);
memset(&tmp[cols * y + copycols], 0, minlineset);
}
// excise any egcpool entries from the right of the new plane area
if(zorch){
for(unsigned x = maxlinecopy ; x < maxlinecopy + zorch ; ++x){
for(unsigned x = copycols ; x < copycols + zorch ; ++x){
pool_release(&nc->pool, &nc->lastframe[fbcellidx(y, nc->lfdimx, x)]);
}
}