notgne2/tuxpaint-pencil-sharpener
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Tacked GPL into comments. More hq4x tweaks.

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This commit is contained in:
William Kendrick 2003-12-21 00:50:52 +00:00
parent 7487c3b31b
commit 8dee572c9d
8 changed files with 404 additions and 340 deletions
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12
src/hqxx.c
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@ -165,7 +165,7 @@ void hqxx_putpixel(SDL_Surface * surface, int x, int y, Uint16 pixel, Uint8 alph
void InitLUTs(int * RGBtoYUV)
void InitLUTs(Uint32 * RGBtoYUV)
{
int i, j, k, r, g, b, Y, u, v;
@ -181,9 +181,7 @@ void InitLUTs(int * 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 & 0xF8) << 8) |
((u & 0xFE) << 3) |
(v >> 3));
RGBtoYUV[(i << 11) + (j << 5) + k] = (Y << 16) + (u << 8) + v;
}
}
}
@ -210,15 +208,11 @@ 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);
}
@ -252,7 +246,7 @@ inline void Interp4(SDL_Surface * dest, int x, int y, Uint16 c1, Uint16 c2, Uint
c = ((((c1 & 0x07E0) * 2 +
((c2 & 0x07E0) +
(c3 & 0x07E0)) * 7) & 0x7E00) +
(c3 & 0x07E0)) * 7) & 0x07E00) +
(((c1 & 0xF81F) * 2 +
((c2 & 0xF81F) +
(c3 & 0xF81F)) * 7) & 0xF81F0)) >> 4;