/*
- Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
+ Copyright (C) 2013-2014 Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include "gamma_lut.h"
#include "image.h"
#include "colour_matrix.h"
+#include <cmath>
using std::min;
using std::max;
using boost::shared_ptr;
-using namespace libdcp;
+using namespace dcp;
#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>
-libdcp::xyz_to_rgb (shared_ptr<const XYZFrame> xyz_frame, shared_ptr<const LUT> lut_in, shared_ptr<const LUT> lut_out)
+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
+ )
{
int const max_colour = pow (2, lut_out->bit_depth()) - 1;
return argb_frame;
}
-shared_ptr<libdcp::XYZFrame>
-libdcp::rgb_to_xyz (shared_ptr<const Image> rgb, shared_ptr<const LUT> lut_in, shared_ptr<const LUT> lut_out, double const colour_matrix[3][3])
+/** 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;
+ }
+}
+
+/** rgb must be packed RGB 16:16:16, 48bpp, 16R, 16G, 16B, with the 2-byte value for each R/G/B component stored as little-endian;
+ * i.e. AV_PIX_FMT_RGB48LE.
+ */
+shared_ptr<dcp::XYZFrame>
+dcp::rgb_to_xyz (
+ boost::shared_ptr<const Image> rgb,
+ boost::shared_ptr<const GammaLUT> lut_in,
+ boost::shared_ptr<const GammaLUT> lut_out,
+ double const colour_matrix[3][3]
+ )
{
assert (lut_in->bit_depth() == 12);
assert (lut_out->bit_depth() == 16);
int jn = 0;
for (int y = 0; y < rgb->size().height; ++y) {
- uint8_t* p = rgb->data()[0] + y * rgb->stride()[0];
+ uint16_t* p = reinterpret_cast<uint16_t *> (rgb->data()[0] + y * rgb->stride()[0]);
for (int x = 0; x < rgb->size().width; ++x) {
- /* In gamma LUT (converting 8-bit input to 12-bit) */
- s.r = lut_in->lut()[*p++ << 4];
- s.g = lut_in->lut()[*p++ << 4];
- s.b = lut_in->lut()[*p++ << 4];
+ /* In gamma LUT (converting 16-bit to 12-bit) */
+ s.r = lut_in->lut()[*p++ >> 4];
+ s.g = lut_in->lut()[*p++ >> 4];
+ s.b = lut_in->lut()[*p++ >> 4];
/* RGB to XYZ Matrix */
d.x = ((s.r * colour_matrix[0][0]) +
d.x = d.x * DCI_COEFFICIENT * 65535;
d.y = d.y * DCI_COEFFICIENT * 65535;
d.z = d.z * DCI_COEFFICIENT * 65535;
+
+ assert (d.x >= 0 && d.x < 65536);
+ assert (d.y >= 0 && d.y < 65536);
+ assert (d.z >= 0 && d.z < 65536);
/* Out gamma LUT */
xyz->data(0)[jn] = lut_out->lut()[(int) d.x] * 4096;
return xyz;
}
+
+
+/** Image must be packed RGB 16:16:16, 48bpp, 16R, 16G, 16B, with the 2-byte value for each R/G/B component stored as little-endian;
+ * i.e. AV_PIX_FMT_RGB48LE.
+ */
+shared_ptr<dcp::XYZFrame>
+dcp::xyz_to_xyz (shared_ptr<const Image> xyz_16)
+{
+ shared_ptr<XYZFrame> xyz_12 (new XYZFrame (xyz_16->size ()));
+
+ int jn = 0;
+ for (int y = 0; y < xyz_16->size().height; ++y) {
+ uint16_t* p = reinterpret_cast<uint16_t *> (xyz_16->data()[0] + y * xyz_16->stride()[0]);
+ for (int x = 0; x < xyz_16->size().width; ++x) {
+ /* Truncate 16-bit to 12-bit */
+ xyz_12->data(0)[jn] = *p++ >> 4;
+ xyz_12->data(1)[jn] = *p++ >> 4;
+ xyz_12->data(2)[jn] = *p++ >> 4;
+ ++jn;
+ }
+ }
+
+ return xyz_12;
+}
projects / libdcp.git / blobdiff