Bitmap *alloc_bitmap(int w, int h)
{
Bitmap *bm;
unsigned align = (w >= 32) ? 32 : ((w >= 16) ? 16 : 1);
unsigned s = ass_align(align, w);
bm = malloc(sizeof(Bitmap));
bm->buffer = ass_aligned_alloc(align, s * h + 32);
memset(bm->buffer, 0, s * h + 32);
bm->w = w;
bm->h = h;
bm->stride = s;
bm->left = bm->top = 0;
return bm;
}
static Bitmap *alloc_bitmap_raw(int w, int h)
{
Bitmap *bm;
unsigned align = (w >= 32) ? 32 : ((w >= 16) ? 16 : 1);
size_t s = ass_align(align, w);
// Too often we use ints as offset for bitmaps => use INT_MAX.
if (s > (INT_MAX - 32) / FFMAX(h, 1))
return NULL;
bm = malloc(sizeof(Bitmap));
if (!bm)
return NULL;
bm->buffer = ass_aligned_alloc(align, s * h + 32);
if (!bm->buffer) {
free(bm);
return NULL;
}
bm->w = w;
bm->h = h;
bm->stride = s;
bm->left = bm->top = 0;
return bm;
}