示例#1
0
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;
}
示例#2
0
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;
}