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Throw if a bitmap starts outside its parents boundaries

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Such bitmaps will, at best, fail to render due to clipping.  These
should never happen, so report it with an exception if it does.
This commit is contained in:
Kp 2021-02-25 03:53:49 +00:00
parent fcd5991eeb
commit 537e9fef37
1 changed files with 3 additions and 0 deletions
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3
common/2d/bitmap.cpp
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@ -123,6 +123,9 @@ void gr_init_sub_bitmap (grs_bitmap &bm, grs_bitmap &bmParent, uint16_t x, uint1
if (subx != (bm.bm_x = static_cast<uint16_t>(subx)) ||
suby != (bm.bm_y = static_cast<uint16_t>(suby)))
throw std::overflow_error("offset overflow");
if (x > bmParent.bm_w ||
y > bmParent.bm_h)
throw std::overflow_error("offset beyond parent dimensions");
bm.bm_w = w;
bm.bm_h = h;
bm.set_flags(bmParent.get_flags());