Add color space conversions on input and output.

[movit] / util.cpp

diff --git a/util.cpp b/util.cpp
index c18f00949d1e2d1bca75bd3945ac2fcbc82e6811..2176786978544994fcb733a4a2bea5f6fb9f77f5 100644 (file)
--- a/util.cpp
+++ b/util.cpp
@@ -88,3 +88,45 @@ GLhandleARB compile_shader(const std::string &shader_src, GLenum type)
        return obj;
 }
 
        return obj;
 }
 

+void multiply_3x3_matrices(const Matrix3x3 a, const Matrix3x3 b, Matrix3x3 result)
+{
+        result[0] = a[0] * b[0] + a[3] * b[1] + a[6] * b[2];
+        result[1] = a[1] * b[0] + a[4] * b[1] + a[7] * b[2];
+        result[2] = a[2] * b[0] + a[5] * b[1] + a[8] * b[2];
+
+        result[3] = a[0] * b[3] + a[3] * b[4] + a[6] * b[5];
+        result[4] = a[1] * b[3] + a[4] * b[4] + a[7] * b[5];
+        result[5] = a[2] * b[3] + a[5] * b[4] + a[8] * b[5];
+
+        result[6] = a[0] * b[6] + a[3] * b[7] + a[6] * b[8];
+        result[7] = a[1] * b[6] + a[4] * b[7] + a[7] * b[8];
+        result[8] = a[2] * b[6] + a[5] * b[7] + a[8] * b[8];
+}
+
+void invert_3x3_matrix(const Matrix3x3 m, Matrix3x3 result)
+{
+       double inv_det = 1.0 / (
+               m[6] * m[1] * m[5] - m[6] * m[2] * m[4] -
+               m[3] * m[1] * m[8] + m[3] * m[2] * m[7] +
+               m[0] * m[4] * m[8] - m[0] * m[5] * m[7]);
+
+       result[0] = inv_det * (m[4] * m[8] - m[5] * m[7]);
+       result[1] = inv_det * (m[2] * m[7] - m[1] * m[8]);
+       result[2] = inv_det * (m[1] * m[5] - m[2] * m[4]);
+
+       result[3] = inv_det * (m[6] * m[5] - m[3] * m[8]);
+       result[4] = inv_det * (m[0] * m[8] - m[6] * m[2]);
+       result[5] = inv_det * (m[3] * m[2] - m[0] * m[5]);
+
+       result[6] = inv_det * (m[3] * m[7] - m[6] * m[4]);
+       result[7] = inv_det * (m[6] * m[1] - m[0] * m[7]);
+       result[8] = inv_det * (m[0] * m[4] - m[3] * m[1]);
+}
+
+void print_3x3_matrix(const Matrix3x3 m)
+{
+       printf("%6.4f %6.4f %6.4f\n", m[0], m[3], m[6]);
+       printf("%6.4f %6.4f %6.4f\n", m[1], m[4], m[7]);
+       printf("%6.4f %6.4f %6.4f\n", m[2], m[5], m[8]);
+       printf("\n");
+}