#define DCI_COEFFICIENT (48.0 / 52.37)
-/** Convert an openjpeg XYZ image to RGB.
+/** Convert an openjpeg XYZ image to RGBA.
* @param xyz_frame Frame in XYZ.
* @param lut_in Input Gamma LUT to use.
* @param lut_out Output Gamma LUT to use.
* @return RGB image.
*/
shared_ptr<ARGBFrame>
-dcp::xyz_to_rgb (
+dcp::xyz_to_rgba (
boost::shared_ptr<const XYZFrame> xyz_frame,
boost::shared_ptr<const GammaLUT> lut_in,
boost::shared_ptr<const GammaLUT> lut_out
return argb_frame;
}
+/** Convert an openjpeg XYZ image to RGB.
+ * @param xyz_frame Frame in XYZ.
+ * @param lut_in Input Gamma LUT to use.
+ * @param lut_out Output Gamma LUT to use.
+ * @param buffer Buffer to write RGB data to; will be written
+ * as one byte R, one byte G, one byte B, one byte R etc. with
+ * no padding at line ends.
+ */
+void
+dcp::xyz_to_rgb (
+ boost::shared_ptr<const XYZFrame> xyz_frame,
+ boost::shared_ptr<const GammaLUT> lut_in,
+ boost::shared_ptr<const GammaLUT> lut_out,
+ uint8_t* buffer
+ )
+{
+ int const max_colour = pow (2, lut_out->bit_depth()) - 1;
+
+ struct {
+ double x, y, z;
+ } s;
+
+ struct {
+ double r, g, b;
+ } d;
+
+ int* xyz_x = xyz_frame->data (0);
+ int* xyz_y = xyz_frame->data (1);
+ int* xyz_z = xyz_frame->data (2);
+
+ for (int y = 0; y < xyz_frame->size().height; ++y) {
+ uint8_t* buffer_line = buffer;
+ for (int x = 0; x < xyz_frame->size().width; ++x) {
+
+ assert (*xyz_x >= 0 && *xyz_y >= 0 && *xyz_z >= 0 && *xyz_x < 4096 && *xyz_y < 4096 && *xyz_z < 4096);
+
+ /* In gamma LUT */
+ s.x = lut_in->lut()[*xyz_x++];
+ s.y = lut_in->lut()[*xyz_y++];
+ s.z = lut_in->lut()[*xyz_z++];
+
+ /* DCI companding */
+ s.x /= DCI_COEFFICIENT;
+ s.y /= DCI_COEFFICIENT;
+ s.z /= DCI_COEFFICIENT;
+
+ /* XYZ to RGB */
+ d.r = ((s.x * colour_matrix::xyz_to_rgb[0][0]) + (s.y * colour_matrix::xyz_to_rgb[0][1]) + (s.z * colour_matrix::xyz_to_rgb[0][2]));
+ d.g = ((s.x * colour_matrix::xyz_to_rgb[1][0]) + (s.y * colour_matrix::xyz_to_rgb[1][1]) + (s.z * colour_matrix::xyz_to_rgb[1][2]));
+ d.b = ((s.x * colour_matrix::xyz_to_rgb[2][0]) + (s.y * colour_matrix::xyz_to_rgb[2][1]) + (s.z * colour_matrix::xyz_to_rgb[2][2]));
+
+ d.r = min (d.r, 1.0);
+ d.r = max (d.r, 0.0);
+
+ d.g = min (d.g, 1.0);
+ d.g = max (d.g, 0.0);
+
+ d.b = min (d.b, 1.0);
+ d.b = max (d.b, 0.0);
+
+ /* Out gamma LUT */
+ *buffer_line++ = lut_out->lut()[(int) (d.r * max_colour)] * 0xff;
+ *buffer_line++ = lut_out->lut()[(int) (d.g * max_colour)] * 0xff;
+ *buffer_line++ = lut_out->lut()[(int) (d.b * max_colour)] * 0xff;
+ }
+
+ buffer += xyz_frame->size().width * 3;
+ }
+}
+
shared_ptr<dcp::XYZFrame>
dcp::rgb_to_xyz (
boost::shared_ptr<const Image> rgb,