Expand QCMS tests. Add Munsell test for transform accuracy

third_party/qcms/src/transform.c

 /* vim: set ts=8 sw=8 noexpandtab: */
 //  qcms
 //  Copyright (C) 2009 Mozilla Corporation
 //  Copyright (C) 1998-2007 Marti Maria
 //
 // Permission is hereby granted, free of charge, to any person obtaining 
 // a copy of this software and associated documentation files (the "Software"), 
 // to deal in the Software without restriction, including without limitation 
 // the rights to use, copy, modify, merge, publish, distribute, sublicense, 
 // and/or sell copies of the Software, and to permit persons to whom the Software 
@@ skipping 393 matching lines @@
                 g = out_linear_g * PRECACHE_OUTPUT_MAX;
                 b = out_linear_b * PRECACHE_OUTPUT_MAX;
 
                 dest[r_out] = transform->output_table_r->data[r];
                 dest[1]     = transform->output_table_g->data[g];
                 dest[b_out] = transform->output_table_b->data[b];
                 dest += 3;
         }
 }
 
-static void qcms_transform_data_rgba_out_lut_precache(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length, qcms_format_type output_format)
+void qcms_transform_data_rgba_out_lut_precache(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length, qcms_format_type output_format)
 {
         const int r_out = output_format.r;
         const int b_out = output_format.b;
 
         unsigned int i;
         float (*mat)[4] = transform->matrix;
         for (i = 0; i < length; i++) {
                 unsigned char device_r = *src++;
                 unsigned char device_g = *src++;
                 unsigned char device_b = *src++;
@@ skipping 1164 matching lines @@
 
         for (i = 0; i < size; ++i) {
                 *data++ = float_to_half_float(t->output_gamma_lut_r[i] * inverse65535); // r
                 *data++ = float_to_half_float(t->output_gamma_lut_g[i] * inverse65535); // g
                 *data++ = float_to_half_float(t->output_gamma_lut_b[i] * inverse65535); // b
                 *data++ = half_float_one;                                               // a
         }
 
         return size;
 }