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ensure command alignment is correct

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Jan200101 2021-10-28 08:43:14 +02:00
parent 38bd9b3326
commit ad1bdf56e3
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1 changed files with 3 additions and 0 deletions
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src/rencache.c
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@ -1,4 +1,5 @@
#include <stdio.h> #include <stdio.h>
#include <stdalign.h>
#include "rencache.h" #include "rencache.h"
/* a cache over the software renderer -- all drawing operations are stored as /* a cache over the software renderer -- all drawing operations are stored as
@ -78,6 +79,8 @@ static RenRect merge_rects(RenRect a, RenRect b) {
static Command* push_command(int type, int size) { static Command* push_command(int type, int size) {
size_t alignment = alignof(max_align_t) - 1;
size = (size + alignment) & ~alignment;
Command *cmd = (Command*) (command_buf + command_buf_idx); Command *cmd = (Command*) (command_buf + command_buf_idx);
int n = command_buf_idx + size; int n = command_buf_idx + size;
if (n > COMMAND_BUF_SIZE) { if (n > COMMAND_BUF_SIZE) {