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Make sure framebuffers are properly aligned

pull/30/head
Andri Yngvason 2020-03-29 13:16:05 +00:00
parent f0974e5af6
commit 22eba2bed8
1 changed files with 7 additions and 1 deletions
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8
src/fb.c
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@ -3,7 +3,10 @@
#include <stdlib.h> #include <stdlib.h>
#include <unistd.h> #include <unistd.h>
#include <sys/param.h>
#define UDIV_UP(a, b) (((a) + (b) - 1) / (b))
#define ALIGN_UP(n, a) (UDIV_UP(n, a) * a)
#define EXPORT __attribute__((visibility("default"))) #define EXPORT __attribute__((visibility("default")))
EXPORT EXPORT
@ -20,11 +23,14 @@ struct nvnc_fb* nvnc_fb_new(uint16_t width, uint16_t height,
fb->fourcc_format = fourcc_format; fb->fourcc_format = fourcc_format;
fb->size = width * height * 4; /* Assume 4 byte format for now */ fb->size = width * height * 4; /* Assume 4 byte format for now */
size_t alignment = MAX(4, sizeof(void*));
size_t aligned_size = ALIGN_UP(fb->size, alignment);
/* fb could be allocated in single allocation, but I want to reserve /* fb could be allocated in single allocation, but I want to reserve
* the possiblity to create an fb with a pixel buffer passed from the * the possiblity to create an fb with a pixel buffer passed from the
* user. * user.
*/ */
fb->addr = malloc(fb->size); fb->addr = aligned_alloc(alignment, aligned_size);
if (!fb->addr) { if (!fb->addr) {
free(fb); free(fb);
fb = NULL; fb = NULL;