Adds qcms to third_party for use in handling ICC color profiles.

third_party/qcms/src/matrix.c

+/* vim: set ts=8 sw=8 noexpandtab: */
+//  qcms
+//  Copyright (C) 2009 Mozilla Foundation
+//  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 "qcmsint.h"
+#include "matrix.h"
+
+struct vector matrix_eval(struct matrix mat, struct vector v)
+{
+        struct vector result;
+        result.v[0] = mat.m[0][0]*v.v[0] + mat.m[0][1]*v.v[1] + mat.m[0][2]*v.v[2];
+        result.v[1] = mat.m[1][0]*v.v[0] + mat.m[1][1]*v.v[1] + mat.m[1][2]*v.v[2];
+        result.v[2] = mat.m[2][0]*v.v[0] + mat.m[2][1]*v.v[1] + mat.m[2][2]*v.v[2];
+        return result;
+}
+
+//XXX: should probably pass by reference and we could
+//probably reuse this computation in matrix_invert
+float matrix_det(struct matrix mat)
+{
+        float det;
+        det = mat.m[0][0]*mat.m[1][1]*mat.m[2][2] +
+                mat.m[0][1]*mat.m[1][2]*mat.m[2][0] +
+                mat.m[0][2]*mat.m[1][0]*mat.m[2][1] -
+                mat.m[0][0]*mat.m[1][2]*mat.m[2][1] -
+                mat.m[0][1]*mat.m[1][0]*mat.m[2][2] -
+                mat.m[0][2]*mat.m[1][1]*mat.m[2][0];
+        return det;
+}
+
+/* from pixman and cairo and Mathematics for Game Programmers */
+/* lcms uses gauss-jordan elimination with partial pivoting which is
+ * less efficient and not as numerically stable. See Mathematics for
+ * Game Programmers. */
+struct matrix matrix_invert(struct matrix mat)
+{
+        struct matrix dest_mat;
+        int i,j;
+        static int a[3] = { 2, 2, 1 };
+        static int b[3] = { 1, 0, 0 };
+
+        /* inv  (A) = 1/det (A) * adj (A) */
+        float det = matrix_det(mat);
+
+        if (det == 0) {
+                dest_mat.invalid = true;
+        } else {
+                dest_mat.invalid = false;
+        }
+
+        det = 1/det;
+
+        for (j = 0; j < 3; j++) {
+                for (i = 0; i < 3; i++) {
+                        double p;
+                        int ai = a[i];
+                        int aj = a[j];
+                        int bi = b[i];
+                        int bj = b[j];
+
+                        p = mat.m[ai][aj] * mat.m[bi][bj] -
+                                mat.m[ai][bj] * mat.m[bi][aj];
+                        if (((i + j) & 1) != 0)
+                                p = -p;
+
+                        dest_mat.m[j][i] = det * p;
+                }
+        }
+        return dest_mat;
+}
+
+struct matrix matrix_identity(void)
+{
+        struct matrix i;
+        i.m[0][0] = 1;
+        i.m[0][1] = 0;
+        i.m[0][2] = 0;
+        i.m[1][0] = 0;
+        i.m[1][1] = 1;
+        i.m[1][2] = 0;
+        i.m[2][0] = 0;
+        i.m[2][1] = 0;
+        i.m[2][2] = 1;
+        i.invalid = false;
+        return i;
+}
+
+struct matrix matrix_invalid(void)
+{
+        struct matrix inv = matrix_identity();
+        inv.invalid = true;
+        return inv;
+}
+
+
+/* from pixman */
+/* MAT3per... */
+struct matrix matrix_multiply(struct matrix a, struct matrix b)
+{
+        struct matrix result;
+        int dx, dy;
+        int o;
+        for (dy = 0; dy < 3; dy++) {
+                for (dx = 0; dx < 3; dx++) {
+                        double v = 0;
+                        for (o = 0; o < 3; o++) {
+                                v += a.m[dy][o] * b.m[o][dx];
+                        }
+                        result.m[dy][dx] = v;
+                }
+        }
+        result.invalid = a.invalid || b.invalid;
+        return result;
+}
+
+