int
dyeColorGetAs(float *v0P, float *v1P, float *v2P,
dyeColor *colIn, int space) {
dyeColor _col, *col;
col = &_col;
dyeColorCopy(col, colIn);
/* hope for no error */
dyeConvert(col, space);
return dyeColorGet(v0P, v1P, v2P, col);
}
/*
******** dyeConvert()
**
** master color conversion function. Can convert between any two
** types by recursive calls and calls to the simple converters above.
*/
int
dyeConvert(dyeColor *col, int outSpace) {
char me[] = "dyeConvert", err[128];
float i0, i1, i2, o0, o1, o2;
dyeConverter simple;
int inSpace, E;
E = 0;
if (!col) {
sprintf(err, "%s: got NULL pointer", me); biffAdd(DYE, err); return 1;
}
inSpace = dyeColorGet(&i0, &i1, &i2, col);
if (!DYE_VALID_SPACE(inSpace)) {
sprintf(err, "%s: invalid input space #%d\n", me, inSpace);
biffAdd(DYE, err); return 1;
}
if (!DYE_VALID_SPACE(outSpace)) {
sprintf(err, "%s: invalid output space #%d\n", me, outSpace);
biffAdd(DYE, err); return 1;
}
if ( (simple = dyeSimpleConvert[inSpace][outSpace]) ) {
(*simple)(&o0, &o1, &o2, i0, i1, i2);
dyeColorSet(col, outSpace, o0, o1, o2);
}
else {
/* we have some work to do ... */
if (inSpace < dyeSpaceRGB && outSpace < dyeSpaceRGB) {
/* its an easy HSV <-- RGB --> HSL conversion */
if (!E) E |= dyeConvert(col, dyeSpaceRGB);
if (!E) E |= dyeConvert(col, outSpace);
}
else if (inSpace > dyeSpaceXYZ && outSpace > dyeSpaceXYZ) {
/* its an easy LAB <-- XYZ --> LUV conversion */
if (!E) E |= dyeConvert(col, dyeSpaceXYZ);
if (!E) E |= dyeConvert(col, outSpace);
}
else {
/* the start and end spaces are at different stages */
if (inSpace < outSpace) {
/* we are going towards higher stages */
if (inSpace < dyeSpaceRGB) {
if (!E) E |= dyeConvert(col, dyeSpaceRGB);
if (!E) E |= dyeConvert(col, outSpace);
}
else if (inSpace == dyeSpaceRGB) {
if (!E) E |= dyeConvert(col, dyeSpaceXYZ);
if (!E) E |= dyeConvert(col, outSpace);
}
else {
sprintf(err, "%s: CONFUSED! can't go %s -> %s\n",
me, dyeSpaceToStr[inSpace], dyeSpaceToStr[outSpace]);
biffAdd(DYE, err);
E = 1;
}
}
else {
/* we are going towards lower stages */
if (outSpace < dyeSpaceRGB) {
if (!E) E |= dyeConvert(col, dyeSpaceRGB);
if (!E) E |= dyeConvert(col, outSpace);
}
else if (outSpace == dyeSpaceRGB) {
if (!E) E |= dyeConvert(col, dyeSpaceXYZ);
if (!E) E |= dyeConvert(col, dyeSpaceRGB);
}
else {
sprintf(err, "%s: CONFUSED! can't go %s -> %s\n",
me, dyeSpaceToStr[inSpace], dyeSpaceToStr[outSpace]);
biffAdd(DYE, err);
E = 1;
}
}
}
}
return E;
}
