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Faster 2bpp function

This commit is contained in:
neauoire 2023-11-12 11:49:21 -08:00
parent 224202e562
commit 0123b4030e
1 changed files with 6 additions and 8 deletions
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14
src/devices/screen.c
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@ -58,18 +58,16 @@ screen_rect(Uint8 *layer, Uint16 x1, Uint16 y1, Uint16 x2, Uint16 y2, int color)
static void static void
screen_2bpp(Uint8 *layer, Uint8 *ram, Uint16 addr, Uint16 x1, Uint16 y1, Uint16 color, int fx, int fy) screen_2bpp(Uint8 *layer, Uint8 *ram, Uint16 addr, Uint16 x1, Uint16 y1, Uint16 color, int fx, int fy)
{ {
int h, width = uxn_screen.width, height = uxn_screen.height, opaque = (color % 5); int width = uxn_screen.width, height = uxn_screen.height, opaque = (color % 5);
Uint8 *ch1 = &ram[addr], *ch2 = ch1 + 8, mx = (fx > 0 ? 8 : 0); Uint8 *ch1 = &ram[addr], *ch2 = ch1 + 8;
Uint16 y, ymod = (fy < 0 ? 8 : 0), ymax = y1 + ymod + fy * 8; Uint16 y, ymod = (fy < 0 ? 8 : 0), ymax = y1 + ymod + fy * 8;
// Uint16 x, xmod = (fx < 0 ? 8 : 0), xmax = x1 + xmod + fx * 8; Uint16 x, xmod = (fx > 0 ? 8 : 0), xmax = x1 + xmod - fx * 8;
for(y = y1 + ymod; y != ymax; y += fy) { for(y = y1 + ymod; y != ymax; y += fy) {
Uint16 c = *ch1++ | (*ch2++ << 8); Uint16 c = *ch1++ | (*ch2++ << 8);
Uint16 xx = x1 + mx; for(x = x1 + xmod; x != xmax; x -= fx, c >>= 1) {
for(h = 7; h >= 0; --h, c >>= 1) {
Uint8 ch = (c & 1) | ((c >> 7) & 2); Uint8 ch = (c & 1) | ((c >> 7) & 2);
xx += -fx; if((opaque || ch) && x < width && y < height)
if((opaque || ch) && xx < width && y < height) layer[x + y * width] = blending[ch][color];
layer[xx + y * width] = blending[ch][color];
} }
} }
} }