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Unified Diff: third_party/qcms/matrix.c

Issue 9702032: Adding qcms to use for handling ICC tagged images. (Closed) Base URL: http://git.chromium.org/chromium/src.git@master
Patch Set: Add qcms to third_party Created 8 years, 9 months ago
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Index: third_party/qcms/matrix.c
diff --git a/third_party/qcms/matrix.c b/third_party/qcms/matrix.c
new file mode 100644
index 0000000000000000000000000000000000000000..0ce5bd66d1937b4d8c652744b6822801c5ab867d
--- /dev/null
+++ b/third_party/qcms/matrix.c
@@ -0,0 +1,136 @@
+/* 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;
+}
+
+
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