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Fixed issue with out-of-screen painting

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This commit is contained in:
Devine Lu Linvega 2023-02-28 21:54:52 -08:00
parent 85df5f2d36
commit 18de47cc1c
1 changed files with 7 additions and 8 deletions
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15
src/devices/screen.c
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@ -28,13 +28,12 @@ static Uint32 palette_mono[] = {
static void
screen_write(UxnScreen *p, Layer *layer, Uint16 x, Uint16 y, Uint8 color)
{
Uint32 i;
if(x > p->width || y > p->height)
return;
i = x + y * p->width;
if(color != layer->pixels[i]) {
layer->pixels[i] = color;
layer->changed = 1;
if(x < p->width && y < p->height) {
Uint32 i = x + y * p->width;
if(color != layer->pixels[i]) {
layer->pixels[i] = color;
layer->changed = 1;
}
}
}
@ -189,7 +188,7 @@ screen_deo(Uint8 *ram, Uint8 *d, Uint8 port)
n = d[0x6] >> 4;
dx = (d[0x6] & 0x01) << 3;
dy = (d[0x6] & 0x02) << 2;
if(addr > 0xfff0)
if(addr > 0x10000 - ((n + 1) << (3 + twobpp)))
return;
for(i = 0; i <= n; i++) {
if(!(d[0xf] & 0xf))