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Convert P to LA without deforming image

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This commit is contained in:
Diederik Veeze 2016-06-25 23:14:21 +02:00
parent 8e7f0cb192
commit 12685ef7c1
1 changed files with 13 additions and 1 deletions
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14
libImaging/Convert.c
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@ -903,6 +903,18 @@ p2l(UINT8* out, const UINT8* in, int xsize, const UINT8* palette)
*out++ = L(&palette[in[x]*4]) / 1000;
}
static void
p2la(UINT8* out, const UINT8* in, int xsize, const UINT8* palette)
{
int x;
/* FIXME: precalculate greyscale palette? */
for (x = 0; x < xsize; x++, out+=4) {
const UINT8* rgba = &palette[*in++ * 4];
out[0] = L(rgba) / 1000;
out[3] = rgba[3];
}
}
static void
pa2la(UINT8* out, const UINT8* in, int xsize, const UINT8* palette)
{
@ -1005,7 +1017,7 @@ frompalette(Imaging imOut, Imaging imIn, const char *mode)
else if (strcmp(mode, "L") == 0)
convert = p2l;
else if (strcmp(mode, "LA") == 0)
convert = (alpha) ? pa2la : p2l;
convert = (alpha) ? pa2la : p2la;
else if (strcmp(mode, "I") == 0)
convert = p2i;
else if (strcmp(mode, "F") == 0)