Add exact version of qcms used by Chrome for testing and comparison

third_party/qcms/src/chain.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 
+// is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in 
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO 
+// THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#include <stdlib.h>
+#include <math.h>
+#include <assert.h>
+#include <string.h> //memcpy
+#include "qcmsint.h"
+#include "transform_util.h"
+#include "matrix.h"
+
+static struct matrix build_lut_matrix(struct lutType *lut)
+{
+        struct matrix result;
+        if (lut) {
+                result.m[0][0] = s15Fixed16Number_to_float(lut->e00);
+                result.m[0][1] = s15Fixed16Number_to_float(lut->e01);
+                result.m[0][2] = s15Fixed16Number_to_float(lut->e02);
+                result.m[1][0] = s15Fixed16Number_to_float(lut->e10);
+                result.m[1][1] = s15Fixed16Number_to_float(lut->e11);
+                result.m[1][2] = s15Fixed16Number_to_float(lut->e12);
+                result.m[2][0] = s15Fixed16Number_to_float(lut->e20);
+                result.m[2][1] = s15Fixed16Number_to_float(lut->e21);
+                result.m[2][2] = s15Fixed16Number_to_float(lut->e22);
+                result.invalid = false;
+        } else {
+                memset(&result, 0, sizeof(struct matrix));
+                result.invalid = true;
+        }
+        return result;
+}
+
+static struct matrix build_mAB_matrix(struct lutmABType *lut)
+{
+        struct matrix result;
+        if (lut) {
+                result.m[0][0] = s15Fixed16Number_to_float(lut->e00);
+                result.m[0][1] = s15Fixed16Number_to_float(lut->e01);
+                result.m[0][2] = s15Fixed16Number_to_float(lut->e02);
+                result.m[1][0] = s15Fixed16Number_to_float(lut->e10);
+                result.m[1][1] = s15Fixed16Number_to_float(lut->e11);
+                result.m[1][2] = s15Fixed16Number_to_float(lut->e12);
+                result.m[2][0] = s15Fixed16Number_to_float(lut->e20);
+                result.m[2][1] = s15Fixed16Number_to_float(lut->e21);
+                result.m[2][2] = s15Fixed16Number_to_float(lut->e22);
+                result.invalid = false;
+        } else {
+                memset(&result, 0, sizeof(struct matrix));
+                result.invalid = true;
+        }
+        return result;
+}
+
+//Based on lcms cmsLab2XYZ
+#define f(t) (t <= (24.0f/116.0f)*(24.0f/116.0f)*(24.0f/116.0f)) ? ((841.0/108.0) * t + (16.0/116.0)) : pow(t,1.0/3.0)
+#define f_1(t) (t <= (24.0f/116.0f)) ? ((108.0/841.0) * (t - (16.0/116.0))) : (t * t * t)
+static void qcms_transform_module_LAB_to_XYZ(struct qcms_modular_transform *transform, float *src, float *dest, size_t length)
+{
+        size_t i;
+        // lcms: D50 XYZ values
+        float WhitePointX = 0.9642f;
+        float WhitePointY = 1.0f;
+        float WhitePointZ = 0.8249f;
+        for (i = 0; i < length; i++) {
+                float device_L = *src++ * 100.0f;
+                float device_a = *src++ * 255.0f - 128.0f;
+                float device_b = *src++ * 255.0f - 128.0f;
+                float y = (device_L + 16.0f) / 116.0f;
+
+                float X = f_1((y + 0.002f * device_a)) * WhitePointX;
+                float Y = f_1(y) * WhitePointY;
+                float Z = f_1((y - 0.005f * device_b)) * WhitePointZ;
+                *dest++ = X / (1.0 + 32767.0/32768.0);
+                *dest++ = Y / (1.0 + 32767.0/32768.0);
+                *dest++ = Z / (1.0 + 32767.0/32768.0);
+        }
+}
+
+//Based on lcms cmsXYZ2Lab
+static void qcms_transform_module_XYZ_to_LAB(struct qcms_modular_transform *transform, float *src, float *dest, size_t length)
+{
+        size_t i;
+        // lcms: D50 XYZ values
+        float WhitePointX = 0.9642f;
+        float WhitePointY = 1.0f;
+        float WhitePointZ = 0.8249f;
+        for (i = 0; i < length; i++) {
+                float device_x = *src++ * (1.0 + 32767.0/32768.0) / WhitePointX;
+                float device_y = *src++ * (1.0 + 32767.0/32768.0) / WhitePointY;
+                float device_z = *src++ * (1.0 + 32767.0/32768.0) / WhitePointZ;
+
+                float fx = f(device_x);
+                float fy = f(device_y);
+                float fz = f(device_z);
+
+                float L = 116.0f*fy - 16.0f;
+                float a = 500.0f*(fx - fy);
+                float b = 200.0f*(fy - fz);
+                *dest++ = L / 100.0f;
+                *dest++ = (a+128.0f) / 255.0f;
+                *dest++ = (b+128.0f) / 255.0f;
+        }
+
+}
+
+static void qcms_transform_module_clut_only(struct qcms_modular_transform *transform, float *src, float *dest, size_t length)
+{
+        size_t i;
+        int xy_len = 1;
+        int x_len = transform->grid_size;
+        int len = x_len * x_len;
+        float* r_table = transform->r_clut;
+        float* g_table = transform->g_clut;
+        float* b_table = transform->b_clut;
+
+        assert(transform->grid_size >= 1);
+
+        for (i = 0; i < length; i++) {
+                float linear_r = *src++;
+                float linear_g = *src++;
+                float linear_b = *src++;
+
+                int x = floor(linear_r * (transform->grid_size-1));
+                int y = floor(linear_g * (transform->grid_size-1));
+                int z = floor(linear_b * (transform->grid_size-1));
+                int x_n = ceil(linear_r * (transform->grid_size-1));
+                int y_n = ceil(linear_g * (transform->grid_size-1));
+                int z_n = ceil(linear_b * (transform->grid_size-1));
+                float x_d = linear_r * (transform->grid_size-1) - x;
+                float y_d = linear_g * (transform->grid_size-1) - y;
+                float z_d = linear_b * (transform->grid_size-1) - z;
+
+                float r_x1 = lerp(CLU(r_table,x,y,z), CLU(r_table,x_n,y,z), x_d);
+                float r_x2 = lerp(CLU(r_table,x,y_n,z), CLU(r_table,x_n,y_n,z), x_d);
+                float r_y1 = lerp(r_x1, r_x2, y_d);
+                float r_x3 = lerp(CLU(r_table,x,y,z_n), CLU(r_table,x_n,y,z_n), x_d);
+                float r_x4 = lerp(CLU(r_table,x,y_n,z_n), CLU(r_table,x_n,y_n,z_n), x_d);
+                float r_y2 = lerp(r_x3, r_x4, y_d);
+                float clut_r = lerp(r_y1, r_y2, z_d);
+
+                float g_x1 = lerp(CLU(g_table,x,y,z), CLU(g_table,x_n,y,z), x_d);
+                float g_x2 = lerp(CLU(g_table,x,y_n,z), CLU(g_table,x_n,y_n,z), x_d);
+                float g_y1 = lerp(g_x1, g_x2, y_d);
+                float g_x3 = lerp(CLU(g_table,x,y,z_n), CLU(g_table,x_n,y,z_n), x_d);
+                float g_x4 = lerp(CLU(g_table,x,y_n,z_n), CLU(g_table,x_n,y_n,z_n), x_d);
+                float g_y2 = lerp(g_x3, g_x4, y_d);
+                float clut_g = lerp(g_y1, g_y2, z_d);
+
+                float b_x1 = lerp(CLU(b_table,x,y,z), CLU(b_table,x_n,y,z), x_d);
+                float b_x2 = lerp(CLU(b_table,x,y_n,z), CLU(b_table,x_n,y_n,z), x_d);
+                float b_y1 = lerp(b_x1, b_x2, y_d);
+                float b_x3 = lerp(CLU(b_table,x,y,z_n), CLU(b_table,x_n,y,z_n), x_d);
+                float b_x4 = lerp(CLU(b_table,x,y_n,z_n), CLU(b_table,x_n,y_n,z_n), x_d);
+                float b_y2 = lerp(b_x3, b_x4, y_d);
+                float clut_b = lerp(b_y1, b_y2, z_d);
+
+                *dest++ = clamp_float(clut_r);
+                *dest++ = clamp_float(clut_g);
+                *dest++ = clamp_float(clut_b);
+        }
+}
+
+static void qcms_transform_module_clut(struct qcms_modular_transform *transform, float *src, float *dest, size_t length)
+{
+        size_t i;
+        int xy_len = 1;
+        int x_len = transform->grid_size;
+        int len = x_len * x_len;
+        float* r_table = transform->r_clut;
+        float* g_table = transform->g_clut;
+        float* b_table = transform->b_clut;
+
+        assert(transform->grid_size >= 1);
+
+        for (i = 0; i < length; i++) {
+                float device_r = *src++;
+                float device_g = *src++;
+                float device_b = *src++;
+                float linear_r = lut_interp_linear_float(device_r,
+                                transform->input_clut_table_r, transform->input_clut_table_length);
+                float linear_g = lut_interp_linear_float(device_g,
+                                transform->input_clut_table_g, transform->input_clut_table_length);
+                float linear_b = lut_interp_linear_float(device_b,
+                                transform->input_clut_table_b, transform->input_clut_table_length);
+
+                int x = floor(linear_r * (transform->grid_size-1));
+                int y = floor(linear_g * (transform->grid_size-1));
+                int z = floor(linear_b * (transform->grid_size-1));
+                int x_n = ceil(linear_r * (transform->grid_size-1));
+                int y_n = ceil(linear_g * (transform->grid_size-1));
+                int z_n = ceil(linear_b * (transform->grid_size-1));
+                float x_d = linear_r * (transform->grid_size-1) - x;
+                float y_d = linear_g * (transform->grid_size-1) - y;
+                float z_d = linear_b * (transform->grid_size-1) - z;
+
+                float r_x1 = lerp(CLU(r_table,x,y,z), CLU(r_table,x_n,y,z), x_d);
+                float r_x2 = lerp(CLU(r_table,x,y_n,z), CLU(r_table,x_n,y_n,z), x_d);
+                float r_y1 = lerp(r_x1, r_x2, y_d);
+                float r_x3 = lerp(CLU(r_table,x,y,z_n), CLU(r_table,x_n,y,z_n), x_d);
+                float r_x4 = lerp(CLU(r_table,x,y_n,z_n), CLU(r_table,x_n,y_n,z_n), x_d);
+                float r_y2 = lerp(r_x3, r_x4, y_d);
+                float clut_r = lerp(r_y1, r_y2, z_d);
+
+                float g_x1 = lerp(CLU(g_table,x,y,z), CLU(g_table,x_n,y,z), x_d);
+                float g_x2 = lerp(CLU(g_table,x,y_n,z), CLU(g_table,x_n,y_n,z), x_d);
+                float g_y1 = lerp(g_x1, g_x2, y_d);
+                float g_x3 = lerp(CLU(g_table,x,y,z_n), CLU(g_table,x_n,y,z_n), x_d);
+                float g_x4 = lerp(CLU(g_table,x,y_n,z_n), CLU(g_table,x_n,y_n,z_n), x_d);
+                float g_y2 = lerp(g_x3, g_x4, y_d);
+                float clut_g = lerp(g_y1, g_y2, z_d);
+
+                float b_x1 = lerp(CLU(b_table,x,y,z), CLU(b_table,x_n,y,z), x_d);
+                float b_x2 = lerp(CLU(b_table,x,y_n,z), CLU(b_table,x_n,y_n,z), x_d);
+                float b_y1 = lerp(b_x1, b_x2, y_d);
+                float b_x3 = lerp(CLU(b_table,x,y,z_n), CLU(b_table,x_n,y,z_n), x_d);
+                float b_x4 = lerp(CLU(b_table,x,y_n,z_n), CLU(b_table,x_n,y_n,z_n), x_d);
+                float b_y2 = lerp(b_x3, b_x4, y_d);
+                float clut_b = lerp(b_y1, b_y2, z_d);
+
+                float pcs_r = lut_interp_linear_float(clut_r,
+                                transform->output_clut_table_r, transform->output_clut_table_length);
+                float pcs_g = lut_interp_linear_float(clut_g,
+                                transform->output_clut_table_g, transform->output_clut_table_length);
+                float pcs_b = lut_interp_linear_float(clut_b,
+                                transform->output_clut_table_b, transform->output_clut_table_length);
+
+                *dest++ = clamp_float(pcs_r);
+                *dest++ = clamp_float(pcs_g);
+                *dest++ = clamp_float(pcs_b);
+        }
+}
+
+/* NOT USED
+static void qcms_transform_module_tetra_clut(struct qcms_modular_transform *transform, float *src, float *dest, size_t length)
+{
+        size_t i;
+        int xy_len = 1;
+        int x_len = transform->grid_size;
+        int len = x_len * x_len;
+        float* r_table = transform->r_clut;
+        float* g_table = transform->g_clut;
+        float* b_table = transform->b_clut;
+        float c0_r, c1_r, c2_r, c3_r;
+        float c0_g, c1_g, c2_g, c3_g;
+        float c0_b, c1_b, c2_b, c3_b;
+        float clut_r, clut_g, clut_b;
+        float pcs_r, pcs_g, pcs_b;
+        for (i = 0; i < length; i++) {
+                float device_r = *src++;
+                float device_g = *src++;
+                float device_b = *src++;
+                float linear_r = lut_interp_linear_float(device_r,
+                                transform->input_clut_table_r, transform->input_clut_table_length);
+                float linear_g = lut_interp_linear_float(device_g,
+                                transform->input_clut_table_g, transform->input_clut_table_length);
+                float linear_b = lut_interp_linear_float(device_b,
+                                transform->input_clut_table_b, transform->input_clut_table_length);
+
+                int x = floor(linear_r * (transform->grid_size-1));
+                int y = floor(linear_g * (transform->grid_size-1));
+                int z = floor(linear_b * (transform->grid_size-1));
+                int x_n = ceil(linear_r * (transform->grid_size-1));
+                int y_n = ceil(linear_g * (transform->grid_size-1));
+                int z_n = ceil(linear_b * (transform->grid_size-1));
+                float rx = linear_r * (transform->grid_size-1) - x;
+                float ry = linear_g * (transform->grid_size-1) - y;
+                float rz = linear_b * (transform->grid_size-1) - z;
+
+                c0_r = CLU(r_table, x, y, z);
+                c0_g = CLU(g_table, x, y, z);
+                c0_b = CLU(b_table, x, y, z);
+                if( rx >= ry ) {
+                        if (ry >= rz) { //rx >= ry && ry >= rz
+                                c1_r = CLU(r_table, x_n, y, z) - c0_r;
+                                c2_r = CLU(r_table, x_n, y_n, z) - CLU(r_table, x_n, y, z);
+                                c3_r = CLU(r_table, x_n, y_n, z_n) - CLU(r_table, x_n, y_n, z);
+                                c1_g = CLU(g_table, x_n, y, z) - c0_g;
+                                c2_g = CLU(g_table, x_n, y_n, z) - CLU(g_table, x_n, y, z);
+                                c3_g = CLU(g_table, x_n, y_n, z_n) - CLU(g_table, x_n, y_n, z);
+                                c1_b = CLU(b_table, x_n, y, z) - c0_b;
+                                c2_b = CLU(b_table, x_n, y_n, z) - CLU(b_table, x_n, y, z);
+                                c3_b = CLU(b_table, x_n, y_n, z_n) - CLU(b_table, x_n, y_n, z);
+                        } else {
+                                if (rx >= rz) { //rx >= rz && rz >= ry
+                                        c1_r = CLU(r_table, x_n, y, z) - c0_r;
+                                        c2_r = CLU(r_table, x_n, y_n, z_n) - CLU(r_table, x_n, y, z_n);
+                                        c3_r = CLU(r_table, x_n, y, z_n) - CLU(r_table, x_n, y, z);
+                                        c1_g = CLU(g_table, x_n, y, z) - c0_g;
+                                        c2_g = CLU(g_table, x_n, y_n, z_n) - CLU(g_table, x_n, y, z_n);
+                                        c3_g = CLU(g_table, x_n, y, z_n) - CLU(g_table, x_n, y, z);
+                                        c1_b = CLU(b_table, x_n, y, z) - c0_b;
+                                        c2_b = CLU(b_table, x_n, y_n, z_n) - CLU(b_table, x_n, y, z_n);
+                                        c3_b = CLU(b_table, x_n, y, z_n) - CLU(b_table, x_n, y, z);
+                                } else { //rz > rx && rx >= ry
+                                        c1_r = CLU(r_table, x_n, y, z_n) - CLU(r_table, x, y, z_n);
+                                        c2_r = CLU(r_table, x_n, y_n, z_n) - CLU(r_table, x_n, y, z_n);
+                                        c3_r = CLU(r_table, x, y, z_n) - c0_r;
+                                        c1_g = CLU(g_table, x_n, y, z_n) - CLU(g_table, x, y, z_n);
+                                        c2_g = CLU(g_table, x_n, y_n, z_n) - CLU(g_table, x_n, y, z_n);
+                                        c3_g = CLU(g_table, x, y, z_n) - c0_g;
+                                        c1_b = CLU(b_table, x_n, y, z_n) - CLU(b_table, x, y, z_n);
+                                        c2_b = CLU(b_table, x_n, y_n, z_n) - CLU(b_table, x_n, y, z_n);
+                                        c3_b = CLU(b_table, x, y, z_n) - c0_b;
+                                }
+                        }
+                } else {
+                        if (rx >= rz) { //ry > rx && rx >= rz
+                                c1_r = CLU(r_table, x_n, y_n, z) - CLU(r_table, x, y_n, z);
+                                c2_r = CLU(r_table, x_n, y_n, z) - c0_r;
+                                c3_r = CLU(r_table, x_n, y_n, z_n) - CLU(r_table, x_n, y_n, z);
+                                c1_g = CLU(g_table, x_n, y_n, z) - CLU(g_table, x, y_n, z);
+                                c2_g = CLU(g_table, x_n, y_n, z) - c0_g;
+                                c3_g = CLU(g_table, x_n, y_n, z_n) - CLU(g_table, x_n, y_n, z);
+                                c1_b = CLU(b_table, x_n, y_n, z) - CLU(b_table, x, y_n, z);
+                                c2_b = CLU(b_table, x_n, y_n, z) - c0_b;
+                                c3_b = CLU(b_table, x_n, y_n, z_n) - CLU(b_table, x_n, y_n, z);
+                        } else {
+                                if (ry >= rz) { //ry >= rz && rz > rx 
+                                        c1_r = CLU(r_table, x_n, y_n, z_n) - CLU(r_table, x, y_n, z_n);
+                                        c2_r = CLU(r_table, x, y_n, z) - c0_r;
+                                        c3_r = CLU(r_table, x, y_n, z_n) - CLU(r_table, x, y_n, z);
+                                        c1_g = CLU(g_table, x_n, y_n, z_n) - CLU(g_table, x, y_n, z_n);
+                                        c2_g = CLU(g_table, x, y_n, z) - c0_g;
+                                        c3_g = CLU(g_table, x, y_n, z_n) - CLU(g_table, x, y_n, z);
+                                        c1_b = CLU(b_table, x_n, y_n, z_n) - CLU(b_table, x, y_n, z_n);
+                                        c2_b = CLU(b_table, x, y_n, z) - c0_b;
+                                        c3_b = CLU(b_table, x, y_n, z_n) - CLU(b_table, x, y_n, z);
+                                } else { //rz > ry && ry > rx
+                                        c1_r = CLU(r_table, x_n, y_n, z_n) - CLU(r_table, x, y_n, z_n);
+                                        c2_r = CLU(r_table, x, y_n, z) - c0_r;
+                                        c3_r = CLU(r_table, x_n, y_n, z_n) - CLU(r_table, x_n, y_n, z);
+                                        c1_g = CLU(g_table, x_n, y_n, z_n) - CLU(g_table, x, y_n, z_n);
+                                        c2_g = CLU(g_table, x, y_n, z) - c0_g;
+                                        c3_g = CLU(g_table, x_n, y_n, z_n) - CLU(g_table, x_n, y_n, z);
+                                        c1_b = CLU(b_table, x_n, y_n, z_n) - CLU(b_table, x, y_n, z_n);
+                                        c2_b = CLU(b_table, x, y_n, z) - c0_b;
+                                        c3_b = CLU(b_table, x_n, y_n, z_n) - CLU(b_table, x_n, y_n, z);
+                                }
+                        }
+                }
+
+                clut_r = c0_r + c1_r*rx + c2_r*ry + c3_r*rz;
+                clut_g = c0_g + c1_g*rx + c2_g*ry + c3_g*rz;
+                clut_b = c0_b + c1_b*rx + c2_b*ry + c3_b*rz;
+
+                pcs_r = lut_interp_linear_float(clut_r,
+                                transform->output_clut_table_r, transform->output_clut_table_length);
+                pcs_g = lut_interp_linear_float(clut_g,
+                                transform->output_clut_table_g, transform->output_clut_table_length);
+                pcs_b = lut_interp_linear_float(clut_b,
+                                transform->output_clut_table_b, transform->output_clut_table_length);
+                *dest++ = clamp_float(pcs_r);
+                *dest++ = clamp_float(pcs_g);
+                *dest++ = clamp_float(pcs_b);
+        }
+}
+*/
+
+static void qcms_transform_module_gamma_table(struct qcms_modular_transform *transform, float *src, float *dest, size_t length)
+{
+        size_t i;
+        float out_r, out_g, out_b;
+        for (i = 0; i < length; i++) {
+                float in_r = *src++;
+                float in_g = *src++;
+                float in_b = *src++;
+
+                out_r = lut_interp_linear_float(in_r, transform->input_clut_table_r, 256);
+                out_g = lut_interp_linear_float(in_g, transform->input_clut_table_g, 256);
+                out_b = lut_interp_linear_float(in_b, transform->input_clut_table_b, 256);
+
+                *dest++ = clamp_float(out_r);
+                *dest++ = clamp_float(out_g);
+                *dest++ = clamp_float(out_b);
+        }
+}
+
+static void qcms_transform_module_gamma_lut(struct qcms_modular_transform *transform, float *src, float *dest, size_t length)
+{
+        size_t i;
+        float out_r, out_g, out_b;
+        for (i = 0; i < length; i++) {
+                float in_r = *src++;
+                float in_g = *src++;
+                float in_b = *src++;
+
+                out_r = lut_interp_linear(in_r,
+                                transform->output_gamma_lut_r, transform->output_gamma_lut_r_length);
+                out_g = lut_interp_linear(in_g,
+                                transform->output_gamma_lut_g, transform->output_gamma_lut_g_length);
+                out_b = lut_interp_linear(in_b,
+                                transform->output_gamma_lut_b, transform->output_gamma_lut_b_length);
+
+                *dest++ = clamp_float(out_r);
+                *dest++ = clamp_float(out_g);
+                *dest++ = clamp_float(out_b);
+        }
+}
+
+static void qcms_transform_module_matrix_translate(struct qcms_modular_transform *transform, float *src, float *dest, size_t length)
+{
+        size_t i;
+        struct matrix mat;
+
+        /* store the results in column major mode
+         * this makes doing the multiplication with sse easier */
+        mat.m[0][0] = transform->matrix.m[0][0];
+        mat.m[1][0] = transform->matrix.m[0][1];
+        mat.m[2][0] = transform->matrix.m[0][2];
+        mat.m[0][1] = transform->matrix.m[1][0];
+        mat.m[1][1] = transform->matrix.m[1][1];
+        mat.m[2][1] = transform->matrix.m[1][2];
+        mat.m[0][2] = transform->matrix.m[2][0];
+        mat.m[1][2] = transform->matrix.m[2][1];
+        mat.m[2][2] = transform->matrix.m[2][2];
+
+        for (i = 0; i < length; i++) {
+                float in_r = *src++;
+                float in_g = *src++;
+                float in_b = *src++;
+
+                float out_r = mat.m[0][0]*in_r + mat.m[1][0]*in_g + mat.m[2][0]*in_b + transform->tx;
+                float out_g = mat.m[0][1]*in_r + mat.m[1][1]*in_g + mat.m[2][1]*in_b + transform->ty;
+                float out_b = mat.m[0][2]*in_r + mat.m[1][2]*in_g + mat.m[2][2]*in_b + transform->tz;
+
+                *dest++ = clamp_float(out_r);
+                *dest++ = clamp_float(out_g);
+                *dest++ = clamp_float(out_b);
+        }
+}
+
+static void qcms_transform_module_matrix(struct qcms_modular_transform *transform, float *src, float *dest, size_t length)
+{
+        size_t i;
+        struct matrix mat;
+
+        /* store the results in column major mode
+         * this makes doing the multiplication with sse easier */
+        mat.m[0][0] = transform->matrix.m[0][0];
+        mat.m[1][0] = transform->matrix.m[0][1];
+        mat.m[2][0] = transform->matrix.m[0][2];
+        mat.m[0][1] = transform->matrix.m[1][0];
+        mat.m[1][1] = transform->matrix.m[1][1];
+        mat.m[2][1] = transform->matrix.m[1][2];
+        mat.m[0][2] = transform->matrix.m[2][0];
+        mat.m[1][2] = transform->matrix.m[2][1];
+        mat.m[2][2] = transform->matrix.m[2][2];
+
+        for (i = 0; i < length; i++) {
+                float in_r = *src++;
+                float in_g = *src++;
+                float in_b = *src++;
+
+                float out_r = mat.m[0][0]*in_r + mat.m[1][0]*in_g + mat.m[2][0]*in_b;
+                float out_g = mat.m[0][1]*in_r + mat.m[1][1]*in_g + mat.m[2][1]*in_b;
+                float out_b = mat.m[0][2]*in_r + mat.m[1][2]*in_g + mat.m[2][2]*in_b;
+
+                *dest++ = clamp_float(out_r);
+                *dest++ = clamp_float(out_g);
+                *dest++ = clamp_float(out_b);
+        }
+}
+
+static struct qcms_modular_transform* qcms_modular_transform_alloc() {
+        return calloc(1, sizeof(struct qcms_modular_transform));
+}
+
+static void qcms_modular_transform_release(struct qcms_modular_transform *transform)
+{
+        struct qcms_modular_transform *next_transform;
+        while (transform != NULL) {
+                next_transform = transform->next_transform;
+                // clut may use a single block of memory.
+                // Perhaps we should remove this to simply the code.
+                if (transform->input_clut_table_r + transform->input_clut_table_length == transform->input_clut_table_g && transform->input_clut_table_g + transform->input_clut_table_length == transform->input_clut_table_b) {
+                        if (transform->input_clut_table_r) free(transform->input_clut_table_r);
+                } else {
+                        if (transform->input_clut_table_r) free(transform->input_clut_table_r);
+                        if (transform->input_clut_table_g) free(transform->input_clut_table_g);
+                        if (transform->input_clut_table_b) free(transform->input_clut_table_b);
+                }
+                if (transform->r_clut + 1 == transform->g_clut && transform->g_clut + 1 == transform->b_clut) {
+                        if (transform->r_clut) free(transform->r_clut);
+                } else {
+                        if (transform->r_clut) free(transform->r_clut);
+                        if (transform->g_clut) free(transform->g_clut);
+                        if (transform->b_clut) free(transform->b_clut);
+                }
+                if (transform->output_clut_table_r + transform->output_clut_table_length == transform->output_clut_table_g && transform->output_clut_table_g+ transform->output_clut_table_length == transform->output_clut_table_b) {
+                        if (transform->output_clut_table_r) free(transform->output_clut_table_r);
+                } else {
+                        if (transform->output_clut_table_r) free(transform->output_clut_table_r);
+                        if (transform->output_clut_table_g) free(transform->output_clut_table_g);
+                        if (transform->output_clut_table_b) free(transform->output_clut_table_b);
+                }
+                if (transform->output_gamma_lut_r) free(transform->output_gamma_lut_r);
+                if (transform->output_gamma_lut_g) free(transform->output_gamma_lut_g);
+                if (transform->output_gamma_lut_b) free(transform->output_gamma_lut_b);
+                free(transform);
+                transform = next_transform;
+        }
+}
+
+/* Set transform to be the next element in the linked list. */
+static void append_transform(struct qcms_modular_transform *transform, struct qcms_modular_transform ***next_transform)
+{
+        **next_transform = transform;
+        while (transform) {
+                *next_transform = &(transform->next_transform);
+                transform = transform->next_transform;
+        }
+}
+
+/* reverse the transformation list (used by mBA) */
+static struct qcms_modular_transform* reverse_transform(struct qcms_modular_transform *transform) 
+{
+        struct qcms_modular_transform *prev_transform = NULL;
+        while (transform != NULL) {
+                struct qcms_modular_transform *next_transform = transform->next_transform;
+                transform->next_transform = prev_transform;
+                prev_transform = transform;
+                transform = next_transform;
+        }
+        
+        return prev_transform;
+}
+
+#define EMPTY_TRANSFORM_LIST NULL
+static struct qcms_modular_transform* qcms_modular_transform_create_mAB(struct lutmABType *lut)
+{
+        struct qcms_modular_transform *first_transform = NULL;
+        struct qcms_modular_transform **next_transform = &first_transform;
+        struct qcms_modular_transform *transform = NULL;
+
+        if (lut->a_curves[0] != NULL) {
+                size_t clut_length;
+                float *clut;
+
+                // If the A curve is present this also implies the 
+                // presence of a CLUT.
+                if (!lut->clut_table) 
+                        goto fail;
+
+                // Prepare A curve.
+                transform = qcms_modular_transform_alloc();
+                if (!transform)
+                        goto fail;
+                append_transform(transform, &next_transform);
+                transform->input_clut_table_r = build_input_gamma_table(lut->a_curves[0]);
+                transform->input_clut_table_g = build_input_gamma_table(lut->a_curves[1]);
+                transform->input_clut_table_b = build_input_gamma_table(lut->a_curves[2]);
+                transform->transform_module_fn = qcms_transform_module_gamma_table;
+                if (lut->num_grid_points[0] != lut->num_grid_points[1] ||
+                        lut->num_grid_points[1] != lut->num_grid_points[2] ) {
+                        //XXX: We don't currently support clut that are not squared!
+                        goto fail;
+                }
+
+                // Prepare CLUT
+                transform = qcms_modular_transform_alloc();
+                if (!transform) 
+                        goto fail;
+                append_transform(transform, &next_transform);
+                clut_length = sizeof(float)*pow(lut->num_grid_points[0], 3)*3;
+                clut = malloc(clut_length);
+                if (!clut)
+                        goto fail;
+                memcpy(clut, lut->clut_table, clut_length);
+                transform->r_clut = clut + 0;
+                transform->g_clut = clut + 1;
+                transform->b_clut = clut + 2;
+                transform->grid_size = lut->num_grid_points[0];
+                transform->transform_module_fn = qcms_transform_module_clut_only;
+        }
+        if (lut->m_curves[0] != NULL) {
+                // M curve imples the presence of a Matrix
+
+                // Prepare M curve
+                transform = qcms_modular_transform_alloc();
+                if (!transform)
+                        goto fail;
+                append_transform(transform, &next_transform);
+                transform->input_clut_table_r = build_input_gamma_table(lut->m_curves[0]);
+                transform->input_clut_table_g = build_input_gamma_table(lut->m_curves[1]);
+                transform->input_clut_table_b = build_input_gamma_table(lut->m_curves[2]);
+                transform->transform_module_fn = qcms_transform_module_gamma_table;
+
+                // Prepare Matrix
+                transform = qcms_modular_transform_alloc();
+                if (!transform) 
+                        goto fail;
+                append_transform(transform, &next_transform);
+                transform->matrix = build_mAB_matrix(lut);
+                if (transform->matrix.invalid)
+                        goto fail;
+                transform->tx = s15Fixed16Number_to_float(lut->e03);
+                transform->ty = s15Fixed16Number_to_float(lut->e13);
+                transform->tz = s15Fixed16Number_to_float(lut->e23);
+                transform->transform_module_fn = qcms_transform_module_matrix_translate;
+        }
+        if (lut->b_curves[0] != NULL) {
+                // Prepare B curve
+                transform = qcms_modular_transform_alloc();
+                if (!transform) 
+                        goto fail;
+                append_transform(transform, &next_transform);
+                transform->input_clut_table_r = build_input_gamma_table(lut->b_curves[0]);
+                transform->input_clut_table_g = build_input_gamma_table(lut->b_curves[1]);
+                transform->input_clut_table_b = build_input_gamma_table(lut->b_curves[2]);
+                transform->transform_module_fn = qcms_transform_module_gamma_table;
+        } else {
+                // B curve is mandatory
+                goto fail;
+        }
+
+        if (lut->reversed) {
+                // mBA are identical to mAB except that the transformation order
+                // is reversed
+                first_transform = reverse_transform(first_transform);
+        }
+
+        return first_transform;
+fail:
+        qcms_modular_transform_release(first_transform);
+        return NULL;
+}
+
+static struct qcms_modular_transform* qcms_modular_transform_create_lut(struct lutType *lut)
+{
+        struct qcms_modular_transform *first_transform = NULL;
+        struct qcms_modular_transform **next_transform = &first_transform;
+        struct qcms_modular_transform *transform = NULL;
+
+        size_t in_curve_len, clut_length, out_curve_len;
+        float *in_curves, *clut, *out_curves;
+
+        // Prepare Matrix
+        transform = qcms_modular_transform_alloc();
+        if (!transform) 
+                goto fail;
+        append_transform(transform, &next_transform);
+        transform->matrix = build_lut_matrix(lut);
+        if (transform->matrix.invalid)
+                goto fail;
+        transform->transform_module_fn = qcms_transform_module_matrix;
+
+        // Prepare input curves
+        transform = qcms_modular_transform_alloc();
+        if (!transform) 
+                goto fail;
+        append_transform(transform, &next_transform);
+        in_curve_len = sizeof(float)*lut->num_input_table_entries * 3;
+        in_curves = malloc(in_curve_len);
+        if (!in_curves) 
+                goto fail;
+        memcpy(in_curves, lut->input_table, in_curve_len);
+        transform->input_clut_table_r = in_curves + lut->num_input_table_entries * 0;
+        transform->input_clut_table_g = in_curves + lut->num_input_table_entries * 1;
+        transform->input_clut_table_b = in_curves + lut->num_input_table_entries * 2;
+        transform->input_clut_table_length = lut->num_input_table_entries;
+
+        // Prepare table
+        clut_length = sizeof(float)*pow(lut->num_clut_grid_points, 3)*3;
+        clut = malloc(clut_length);
+        if (!clut) 
+                goto fail;
+        memcpy(clut, lut->clut_table, clut_length);
+        transform->r_clut = clut + 0;
+        transform->g_clut = clut + 1;
+        transform->b_clut = clut + 2;
+        transform->grid_size = lut->num_clut_grid_points;
+
+        // Prepare output curves
+        out_curve_len = sizeof(float) * lut->num_output_table_entries * 3;
+        out_curves = malloc(out_curve_len);
+        if (!out_curves) 
+                goto fail;
+        memcpy(out_curves, lut->output_table, out_curve_len);
+        transform->output_clut_table_r = out_curves + lut->num_output_table_entries * 0;
+        transform->output_clut_table_g = out_curves + lut->num_output_table_entries * 1;
+        transform->output_clut_table_b = out_curves + lut->num_output_table_entries * 2;
+        transform->output_clut_table_length = lut->num_output_table_entries;
+        transform->transform_module_fn = qcms_transform_module_clut;
+
+        return first_transform;
+fail:
+        qcms_modular_transform_release(first_transform);
+        return NULL;
+}
+
+struct qcms_modular_transform* qcms_modular_transform_create_input(qcms_profile *in)
+{
+        struct qcms_modular_transform *first_transform = NULL;
+        struct qcms_modular_transform **next_transform = &first_transform;
+
+        if (in->A2B0) {
+                struct qcms_modular_transform *lut_transform;
+                lut_transform = qcms_modular_transform_create_lut(in->A2B0);
+                if (!lut_transform)
+                        goto fail;
+                append_transform(lut_transform, &next_transform);
+        } else if (in->mAB && in->mAB->num_in_channels == 3 && in->mAB->num_out_channels == 3) {
+                struct qcms_modular_transform *mAB_transform;
+                mAB_transform = qcms_modular_transform_create_mAB(in->mAB);
+                if (!mAB_transform)
+                        goto fail;
+                append_transform(mAB_transform, &next_transform);
+
+        } else {
+                struct qcms_modular_transform *transform;
+
+                transform = qcms_modular_transform_alloc();
+                if (!transform)
+                        goto fail;
+                append_transform(transform, &next_transform);
+                transform->input_clut_table_r = build_input_gamma_table(in->redTRC);
+                transform->input_clut_table_g = build_input_gamma_table(in->greenTRC);
+                transform->input_clut_table_b = build_input_gamma_table(in->blueTRC);
+                transform->transform_module_fn = qcms_transform_module_gamma_table;
+                if (!transform->input_clut_table_r || !transform->input_clut_table_g ||
+                                !transform->input_clut_table_b) {
+                        goto fail;
+                }
+
+                transform = qcms_modular_transform_alloc();
+                if (!transform) 
+                        goto fail;
+                append_transform(transform, &next_transform);
+                transform->matrix.m[0][0] = 1/1.999969482421875f;
+                transform->matrix.m[0][1] = 0.f;
+                transform->matrix.m[0][2] = 0.f;
+                transform->matrix.m[1][0] = 0.f;
+                transform->matrix.m[1][1] = 1/1.999969482421875f;
+                transform->matrix.m[1][2] = 0.f;
+                transform->matrix.m[2][0] = 0.f;
+                transform->matrix.m[2][1] = 0.f;
+                transform->matrix.m[2][2] = 1/1.999969482421875f;
+                transform->matrix.invalid = false;
+                transform->transform_module_fn = qcms_transform_module_matrix;
+
+                transform = qcms_modular_transform_alloc();
+                if (!transform) 
+                        goto fail;
+                append_transform(transform, &next_transform);
+                transform->matrix = build_colorant_matrix(in);
+                transform->transform_module_fn = qcms_transform_module_matrix;
+        }
+
+        return first_transform;
+fail:
+        qcms_modular_transform_release(first_transform);
+        return EMPTY_TRANSFORM_LIST;
+}
+static struct qcms_modular_transform* qcms_modular_transform_create_output(qcms_profile *out)
+{
+        struct qcms_modular_transform *first_transform = NULL;
+        struct qcms_modular_transform **next_transform = &first_transform;
+
+        if (out->B2A0) {
+                struct qcms_modular_transform *lut_transform;
+                lut_transform = qcms_modular_transform_create_lut(out->B2A0);
+                if (!lut_transform) 
+                        goto fail;
+                append_transform(lut_transform, &next_transform);
+        } else if (out->mBA && out->mBA->num_in_channels == 3 && out->mBA->num_out_channels == 3) {
+                struct qcms_modular_transform *lut_transform;
+                lut_transform = qcms_modular_transform_create_mAB(out->mBA);
+                if (!lut_transform) 
+                        goto fail;
+                append_transform(lut_transform, &next_transform);
+        } else if (out->redTRC && out->greenTRC && out->blueTRC) {
+                struct qcms_modular_transform *transform;
+
+                transform = qcms_modular_transform_alloc();
+                if (!transform) 
+                        goto fail;
+                append_transform(transform, &next_transform);
+                transform->matrix = matrix_invert(build_colorant_matrix(out));
+                transform->transform_module_fn = qcms_transform_module_matrix;
+
+                transform = qcms_modular_transform_alloc();
+                if (!transform) 
+                        goto fail;
+                append_transform(transform, &next_transform);
+                transform->matrix.m[0][0] = 1.999969482421875f;
+                transform->matrix.m[0][1] = 0.f;
+                transform->matrix.m[0][2] = 0.f;
+                transform->matrix.m[1][0] = 0.f;
+                transform->matrix.m[1][1] = 1.999969482421875f;
+                transform->matrix.m[1][2] = 0.f;
+                transform->matrix.m[2][0] = 0.f;
+                transform->matrix.m[2][1] = 0.f;
+                transform->matrix.m[2][2] = 1.999969482421875f;
+                transform->matrix.invalid = false;
+                transform->transform_module_fn = qcms_transform_module_matrix;
+
+                transform = qcms_modular_transform_alloc();
+                if (!transform) 
+                        goto fail;
+                append_transform(transform, &next_transform);
+                build_output_lut(out->redTRC, &transform->output_gamma_lut_r,
+                        &transform->output_gamma_lut_r_length);
+                build_output_lut(out->greenTRC, &transform->output_gamma_lut_g,
+                        &transform->output_gamma_lut_g_length);
+                build_output_lut(out->blueTRC, &transform->output_gamma_lut_b,
+                        &transform->output_gamma_lut_b_length);
+                transform->transform_module_fn = qcms_transform_module_gamma_lut;
+
+                if (!transform->output_gamma_lut_r || !transform->output_gamma_lut_g ||
+                                !transform->output_gamma_lut_b) {
+                        goto fail;
+                }
+        } else {
+                assert(0 && "Unsupported output profile workflow.");
+                return NULL;
+        }
+
+        return first_transform;
+fail:
+        qcms_modular_transform_release(first_transform);
+        return EMPTY_TRANSFORM_LIST;
+}
+
+/* Not Completed
+// Simplify the transformation chain to an equivalent transformation chain
+static struct qcms_modular_transform* qcms_modular_transform_reduce(struct qcms_modular_transform *transform)
+{
+        struct qcms_modular_transform *first_transform = NULL;
+        struct qcms_modular_transform *curr_trans = transform;
+        struct qcms_modular_transform *prev_trans = NULL;
+        while (curr_trans) {
+                struct qcms_modular_transform *next_trans = curr_trans->next_transform;
+                if (curr_trans->transform_module_fn == qcms_transform_module_matrix) {
+                        if (next_trans && next_trans->transform_module_fn == qcms_transform_module_matrix) {
+                                curr_trans->matrix = matrix_multiply(curr_trans->matrix, next_trans->matrix);
+                                goto remove_next;       
+                        }
+                }
+                if (curr_trans->transform_module_fn == qcms_transform_module_gamma_table) {
+                        bool isLinear = true;
+                        uint16_t i;
+                        for (i = 0; isLinear && i < 256; i++) {
+                                isLinear &= (int)(curr_trans->input_clut_table_r[i] * 255) == i;
+                                isLinear &= (int)(curr_trans->input_clut_table_g[i] * 255) == i;
+                                isLinear &= (int)(curr_trans->input_clut_table_b[i] * 255) == i;
+                        }
+                        goto remove_current;
+                }
+                
+next_transform:
+                if (!next_trans) break;
+                prev_trans = curr_trans;
+                curr_trans = next_trans;
+                continue;
+remove_current:
+                if (curr_trans == transform) {
+                        //Update head
+                        transform = next_trans;
+                } else {
+                        prev_trans->next_transform = next_trans;
+                }
+                curr_trans->next_transform = NULL;
+                qcms_modular_transform_release(curr_trans);
+                //return transform;
+                return qcms_modular_transform_reduce(transform);
+remove_next:
+                curr_trans->next_transform = next_trans->next_transform;
+                next_trans->next_transform = NULL;
+                qcms_modular_transform_release(next_trans);
+                continue;
+        }
+        return transform;
+}
+*/
+
+static struct qcms_modular_transform* qcms_modular_transform_create(qcms_profile *in, qcms_profile *out)
+{
+        struct qcms_modular_transform *first_transform = NULL;
+        struct qcms_modular_transform **next_transform = &first_transform;
+        qcms_bool transform_to_pcs_xyz_only = (out == NULL);
+
+        if (in->color_space == RGB_SIGNATURE) {
+                struct qcms_modular_transform* rgb_to_pcs;
+                rgb_to_pcs = qcms_modular_transform_create_input(in);
+                if (!rgb_to_pcs) 
+                        goto fail;
+                append_transform(rgb_to_pcs, &next_transform);
+        } else {
+                assert(0 && "input color space not supported");
+                goto fail;
+        }
+
+        if (in->pcs == LAB_SIGNATURE && (transform_to_pcs_xyz_only || out->pcs == XYZ_SIGNATURE)) {
+                struct qcms_modular_transform* lab_to_pcs;
+                lab_to_pcs = qcms_modular_transform_alloc();
+                if (!lab_to_pcs) 
+                        goto fail;
+                append_transform(lab_to_pcs, &next_transform);
+                lab_to_pcs->transform_module_fn = qcms_transform_module_LAB_to_XYZ;
+        }
+
+        if (transform_to_pcs_xyz_only)
+                return first_transform;
+
+        // This does not improve accuracy in practice, something is wrong here.
+        //if (in->chromaticAdaption.invalid == false) {
+        //      struct qcms_modular_transform* chromaticAdaption;
+        //      chromaticAdaption = qcms_modular_transform_alloc();
+        //      if (!chromaticAdaption) 
+        //              goto fail;
+        //      append_transform(chromaticAdaption, &next_transform);
+        //      chromaticAdaption->matrix = matrix_invert(in->chromaticAdaption);
+        //      chromaticAdaption->transform_module_fn = qcms_transform_module_matrix;
+        //}
+
+        if (in->pcs == XYZ_SIGNATURE && out->pcs == LAB_SIGNATURE) {
+                struct qcms_modular_transform* pcs_to_lab;
+                pcs_to_lab = qcms_modular_transform_alloc();
+                if (!pcs_to_lab) 
+                        goto fail;
+                append_transform(pcs_to_lab, &next_transform);
+                pcs_to_lab->transform_module_fn = qcms_transform_module_XYZ_to_LAB;
+        }
+
+        if (out->color_space == RGB_SIGNATURE) {
+                struct qcms_modular_transform* pcs_to_rgb;
+                pcs_to_rgb = qcms_modular_transform_create_output(out);
+                if (!pcs_to_rgb) 
+                        goto fail;
+                append_transform(pcs_to_rgb, &next_transform);
+        } else {
+                assert(0 && "output color space not supported");
+                goto fail;
+        }
+        // Not Completed
+        //return qcms_modular_transform_reduce(first_transform);
+        return first_transform;
+fail:
+        qcms_modular_transform_release(first_transform);
+        return EMPTY_TRANSFORM_LIST;
+}
+
+static float* qcms_modular_transform_data(struct qcms_modular_transform *transform, float *src, float *dest, size_t len)
+{
+        while (transform != NULL) {
+                // Keep swaping src/dest when performing a transform to use less memory.
+                float *new_src = dest;
+                const transform_module_fn_t transform_fn = transform->transform_module_fn;
+                if (transform_fn != qcms_transform_module_gamma_table &&
+                    transform_fn != qcms_transform_module_gamma_lut &&
+                    transform_fn != qcms_transform_module_clut &&
+                    transform_fn != qcms_transform_module_clut_only &&
+                    transform_fn != qcms_transform_module_matrix &&
+                    transform_fn != qcms_transform_module_matrix_translate &&
+                    transform_fn != qcms_transform_module_LAB_to_XYZ &&
+                    transform_fn != qcms_transform_module_XYZ_to_LAB) {
+                        assert(0 && "Unsupported transform module");
+                        return NULL;
+                }
+                transform->transform_module_fn(transform,src,dest,len);
+                dest = src;
+                src = new_src;
+                transform = transform->next_transform;
+        }
+        // The results end up in the src buffer because of the switching
+        return src;
+}
+
+float* qcms_chain_transform(qcms_profile *in, qcms_profile *out, float *src, float *dest, size_t lutSize)
+{
+        struct qcms_modular_transform *transform_list = qcms_modular_transform_create(in, out);
+        if (transform_list != NULL) {
+                float *lut = qcms_modular_transform_data(transform_list, src, dest, lutSize/3);
+                qcms_modular_transform_release(transform_list);
+                return lut;
+        }
+        return NULL;
+}
+
+qcms_bool qcms_profile_white_transform(qcms_profile *profile, float XYZ[3])
+{
+        const float inverse_internal_scale = 1.999969482421875f;
+
+        // Set the output profile to NULL to request a color transform to PCS XYZ only.
+        struct qcms_modular_transform *transform_list = qcms_modular_transform_create(profile, NULL);
+
+        // Now calculate how the profile transforms white input color to PCS XYZ space.
+        if (transform_list != NULL) {
+                XYZ[0] = XYZ[1] = XYZ[2] = 1.0f; // white input
+                qcms_modular_transform_data(transform_list, XYZ, XYZ, 1);
+                // qcms_modular_transform_create internally scales input by 1/1.999969482421875f
+                // but no qcms changelog describes why / how that number was choosen. junov@ "it
+                // might be related to the epsilon of the fixed-point type 2*(1-1/(2^16)), but
+                // there is no explanation, which is disconcerting." Meanwhile, undo the internal
+                // scaling so we return a normalized CIEXYZ value viz., where Y is scaled to 1.0.
+                // A properly created color profile should produce Y=~1.0 in PCS XYZ with white
+                // input (the D50 test). If it does not, then the profile is likely bogus.
+                XYZ[0] *= inverse_internal_scale;
+                XYZ[1] *= inverse_internal_scale;
+                XYZ[2] *= inverse_internal_scale;
+                qcms_modular_transform_release(transform_list);
+                return true;
+        }
+
+        return false;
+}