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(screen.c) Do not shift a zero in 1bpp

This commit is contained in:
Devine Lu Linvega 2023-02-28 19:34:13 -08:00
parent 3818720eb2
commit 5709511c7e
1 changed files with 9 additions and 8 deletions
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17
src/devices/screen.c
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@ -28,12 +28,13 @@ static Uint32 palette_mono[] = {
static void static void
screen_write(UxnScreen *p, Layer *layer, Uint16 x, Uint16 y, Uint8 color) screen_write(UxnScreen *p, Layer *layer, Uint16 x, Uint16 y, Uint8 color)
{ {
if(x < p->width && y < p->height) { Uint32 i;
Uint32 i = x + y * p->width; if(x > p->width || y > p->height)
if(color != layer->pixels[i]) { return;
layer->pixels[i] = color; i = x + y * p->width;
layer->changed = 1; if(color != layer->pixels[i]) {
} layer->pixels[i] = color;
layer->changed = 1;
} }
} }
@ -42,7 +43,7 @@ screen_blit(UxnScreen *p, Layer *layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8
{ {
int v, h, opaque = (color % 5) || !color; int v, h, opaque = (color % 5) || !color;
for(v = 0; v < 8; v++) { for(v = 0; v < 8; v++) {
Uint16 c = sprite[v] | (twobpp ? sprite[v + 8] : 0) << 8; Uint16 c = sprite[v] | (twobpp ? (sprite[v + 8] << 8) : 0);
for(h = 7; h >= 0; --h, c >>= 1) { for(h = 7; h >= 0; --h, c >>= 1) {
Uint8 ch = (c & 1) | ((c >> 7) & 2); Uint8 ch = (c & 1) | ((c >> 7) & 2);
if(opaque || ch) if(opaque || ch)
@ -179,7 +180,7 @@ screen_deo(Uint8 *ram, Uint8 *d, Uint8 port)
n = d[0x6] >> 4; n = d[0x6] >> 4;
dx = (d[0x6] & 0x01) << 3; dx = (d[0x6] & 0x01) << 3;
dy = (d[0x6] & 0x02) << 2; dy = (d[0x6] & 0x02) << 2;
if(addr > 0x10000 - ((n + 1) << (3 + twobpp))) if(addr > 0xfff0)
return; return;
for(i = 0; i <= n; i++) { for(i = 0; i <= n; i++) {
screen_blit(&uxn_screen, layer, x + dy * i, y + dx * i, &ram[addr], d[0xf] & 0xf, d[0xf] & 0x10, d[0xf] & 0x20, twobpp); screen_blit(&uxn_screen, layer, x + dy * i, y + dx * i, &ram[addr], d[0xf] & 0xf, d[0xf] & 0x10, d[0xf] & 0x20, twobpp);