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75 lines
1.6 KiB
C
75 lines
1.6 KiB
C
/*
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* The Python Imaging Library
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* $Id$
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*
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* colour and luminance matrix transforms
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*
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* history:
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* 1996-05-18 fl: created (brute force implementation)
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*
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* Copyright (c) Fredrik Lundh 1996.
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* Copyright (c) Secret Labs AB 1997.
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*
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* See the README file for information on usage and redistribution.
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*/
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#include "Imaging.h"
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#define CLIPF(v) ((v <= 0.0) ? 0 : (v >= 255.0F) ? 255 : (UINT8) v)
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Imaging
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ImagingConvertMatrix(Imaging im, const char *mode, float m[])
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{
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Imaging imOut;
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int x, y;
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/* Assume there's enough data in the buffer */
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if (!im)
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return (Imaging) ImagingError_ModeError();
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if (strcmp(mode, "L") == 0 && im->bands == 3) {
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imOut = ImagingNew("L", im->xsize, im->ysize);
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if (!imOut)
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return NULL;
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for (y = 0; y < im->ysize; y++) {
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UINT8* in = (UINT8*) im->image[y];
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UINT8* out = (UINT8*) imOut->image[y];
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for (x = 0; x < im->xsize; x++) {
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float v = m[0]*in[0] + m[1]*in[1] + m[2]*in[2] + m[3] + 0.5;
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out[x] = CLIPF(v);
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in += 4;
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}
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}
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} else if (strlen(mode) == 3 && im->bands == 3) {
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imOut = ImagingNew(mode, im->xsize, im->ysize);
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if (!imOut)
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return NULL;
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for (y = 0; y < im->ysize; y++) {
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UINT8* in = (UINT8*) im->image[y];
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UINT8* out = (UINT8*) imOut->image[y];
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for (x = 0; x < im->xsize; x++) {
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float v0 = m[0]*in[0] + m[1]*in[1] + m[2]*in[2] + m[3] + 0.5;
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float v1 = m[4]*in[0] + m[5]*in[1] + m[6]*in[2] + m[7] + 0.5;
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float v2 = m[8]*in[0] + m[9]*in[1] + m[10]*in[2] + m[11] + 0.5;
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out[0] = CLIPF(v0);
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out[1] = CLIPF(v1);
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out[2] = CLIPF(v2);
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in += 4; out += 4;
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}
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}
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} else
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return (Imaging) ImagingError_ModeError();
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return imOut;
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}
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