(screen.c) Do not shift a zero in 1bpp
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3818720eb2
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5709511c7e
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@ -28,13 +28,14 @@ static Uint32 palette_mono[] = {
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static void
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static void
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screen_write(UxnScreen *p, Layer *layer, Uint16 x, Uint16 y, Uint8 color)
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screen_write(UxnScreen *p, Layer *layer, Uint16 x, Uint16 y, Uint8 color)
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{
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{
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if(x < p->width && y < p->height) {
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Uint32 i;
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Uint32 i = x + y * p->width;
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if(x > p->width || y > p->height)
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return;
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i = x + y * p->width;
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if(color != layer->pixels[i]) {
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if(color != layer->pixels[i]) {
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layer->pixels[i] = color;
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layer->pixels[i] = color;
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layer->changed = 1;
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layer->changed = 1;
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}
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}
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}
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}
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}
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static void
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static void
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@ -42,7 +43,7 @@ screen_blit(UxnScreen *p, Layer *layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8
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{
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{
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int v, h, opaque = (color % 5) || !color;
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int v, h, opaque = (color % 5) || !color;
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for(v = 0; v < 8; v++) {
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for(v = 0; v < 8; v++) {
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Uint16 c = sprite[v] | (twobpp ? sprite[v + 8] : 0) << 8;
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Uint16 c = sprite[v] | (twobpp ? (sprite[v + 8] << 8) : 0);
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for(h = 7; h >= 0; --h, c >>= 1) {
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for(h = 7; h >= 0; --h, c >>= 1) {
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Uint8 ch = (c & 1) | ((c >> 7) & 2);
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Uint8 ch = (c & 1) | ((c >> 7) & 2);
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if(opaque || ch)
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if(opaque || ch)
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@ -179,7 +180,7 @@ screen_deo(Uint8 *ram, Uint8 *d, Uint8 port)
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n = d[0x6] >> 4;
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n = d[0x6] >> 4;
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dx = (d[0x6] & 0x01) << 3;
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dx = (d[0x6] & 0x01) << 3;
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dy = (d[0x6] & 0x02) << 2;
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dy = (d[0x6] & 0x02) << 2;
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if(addr > 0x10000 - ((n + 1) << (3 + twobpp)))
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if(addr > 0xfff0)
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return;
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return;
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for(i = 0; i <= n; i++) {
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for(i = 0; i <= n; i++) {
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screen_blit(&uxn_screen, layer, x + dy * i, y + dx * i, &ram[addr], d[0xf] & 0xf, d[0xf] & 0x10, d[0xf] & 0x20, twobpp);
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screen_blit(&uxn_screen, layer, x + dy * i, y + dx * i, &ram[addr], d[0xf] & 0xf, d[0xf] & 0x10, d[0xf] & 0x20, twobpp);
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