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screen: fix an UB

This commit is contained in:
Sigrid Solveig Haflínudóttir 2024-02-14 16:28:50 +00:00
parent 300a3d7b3e
commit 3fa01a63d8
1 changed files with 2 additions and 2 deletions
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4
src/devices/screen.c
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@ -62,8 +62,8 @@ screen_2bpp(Uint8 *layer, Uint8 *addr, Uint16 x1, Uint16 y1, Uint16 color, int f
int w = uxn_screen.width, h = uxn_screen.height, opaque = blending[4][color]; int w = uxn_screen.width, h = uxn_screen.height, opaque = blending[4][color];
Uint16 y, ymod = (fy < 0 ? 7 : 0), ymax = y1 + ymod + fy * 8; Uint16 y, ymod = (fy < 0 ? 7 : 0), ymax = y1 + ymod + fy * 8;
Uint16 x, xmod = (fx > 0 ? 7 : 0), xmax = x1 + xmod - fx * 8; Uint16 x, xmod = (fx > 0 ? 7 : 0), xmax = x1 + xmod - fx * 8;
for(y = y1 + ymod; y != ymax; y += fy) { for(y = y1 + ymod; y != ymax; y += fy, addr++) {
int c = *addr++ | (*(addr + 7) << 8), row = y * w; int c = addr[0] | (addr[8] << 8), row = y * w;
if(y < h) if(y < h)
for(x = x1 + xmod; x != xmax; x -= fx, c >>= 1) { for(x = x1 + xmod; x != xmax; x -= fx, c >>= 1) {
Uint8 ch = (c & 1) | ((c >> 7) & 2); Uint8 ch = (c & 1) | ((c >> 7) & 2);