notgne2/tuxpaint-pencil-sharpener
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Got hq4x to semi-usable state.

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This commit is contained in:
William Kendrick 2003-12-21 01:01:50 +00:00
parent 8dee572c9d
commit 8ab8165e6b
4 changed files with 20 additions and 18 deletions
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10
src/hqxx.c
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@ -181,7 +181,9 @@ void InitLUTs(Uint32 * RGBtoYUV)
Y = (r + g + b) >> 2;
u = 128 + ((r - b) >> 2);
v = 128 + ((-r + 2 * g - b) >> 3);
RGBtoYUV[(i << 11) + (j << 5) + k] = (Y << 16) + (u << 8) + v;
RGBtoYUV[(i << 11) + (j << 5) + k] = (((Y & 0xF8) << 8) |
((u & 0xFE) << 3) |
(v >> 3));
}
}
}
@ -208,11 +210,15 @@ inline void Interp2(SDL_Surface * dest, int x, int y, Uint16 c1, Uint16 c2, Uint
{
Uint32 c;
/* FIXME? */
// c = (c1 * 2 + c2 + c3) >> 2;
c = ((((c1 & 0x07E0) * 2 + (c2 & 0x07E0) + (c3 & 0x07E0)) & (0x07E0 << 2)) +
(((c1 & 0xF81F) * 2 + (c2 & 0xF81F) + (c3 & 0xF81F)) & (0xF81F << 2)))
>> 2;
hqxx_putpixel(dest, x, y, c, alpha);
}
@ -246,7 +252,7 @@ inline void Interp4(SDL_Surface * dest, int x, int y, Uint16 c1, Uint16 c2, Uint
c = ((((c1 & 0x07E0) * 2 +
((c2 & 0x07E0) +
(c3 & 0x07E0)) * 7) & 0x07E00) +
(c3 & 0x07E0)) * 7) & 0x7E00) +
(((c1 & 0xF81F) * 2 +
((c2 & 0xF81F) +
(c3 & 0xF81F)) * 7) & 0xF81F0)) >> 4;