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[libdcp.git] / src / util.cc

diff --git a/src/util.cc b/src/util.cc
index ca621a445cdafc25fc8f5e38e8d958bb289a030d..c66e63f5104bfb14d272dde96e74bf90af34bf0d 100644 (file)
--- a/src/util.cc
+++ b/src/util.cc
@@ -34,7 +34,7 @@
 #include "exceptions.h"
 #include "types.h"
 #include "argb_frame.h"
-#include "lut.h"
+#include "gamma_lut.h"
 
 using std::string;
 using std::stringstream;
@@ -66,7 +66,7 @@ libdcp::make_digest (string filename)
 {
        Kumu::FileReader reader;
        if (ASDCP_FAILURE (reader.OpenRead (filename.c_str ()))) {
-               throw FileError ("could not open file to compute digest", filename);
+               boost::throw_exception (FileError ("could not open file to compute digest", filename));
        }
        
        SHA_CTX sha;
@@ -81,7 +81,7 @@ libdcp::make_digest (string filename)
                if (r == Kumu::RESULT_ENDOFFILE) {
                        break;
                } else if (ASDCP_FAILURE (r)) {
-                       throw FileError ("could not read file to compute digest", filename);
+                       boost::throw_exception (FileError ("could not read file to compute digest", filename));
                }
                
                SHA1_Update (&sha, read_buffer.Data(), read);
@@ -165,34 +165,6 @@ libdcp::content_kind_from_string (string type)
        assert (false);
 }
 
-/** @param big A string.
- *  @param little A string which is the same length as, or shorter than, big.
- *  @return true if `big' starts with `little'.
- */
-bool
-libdcp::starts_with (string big, string little)
-{
-       if (little.size() > big.size()) {
-               return false;
-       }
-
-       return big.substr (0, little.length()) == little;
-}
-
-/** @param big A string.
- *  @param little A string which is the same length as, or shorter than, big.
- *  @return true if `big' ends with `little'.
- */
-bool
-libdcp::ends_with (string big, string little)
-{
-       if (little.size() > big.size()) {
-               return false;
-       }
-
-       return big.compare (big.length() - little.length(), little.length(), little) == 0;
-}
-
 /** Decompress a JPEG2000 image to a bitmap.
  *  @param data JPEG2000 data.
  *  @param size Size of data in bytes.
@@ -215,7 +187,7 @@ libdcp::decompress_j2k (uint8_t* data, int64_t size, int reduce)
        if (!image) {
                opj_destroy_decompress (decoder);
                opj_cio_close (cio);
-               throw DCPReadError ("could not decode JPEG2000 codestream");
+               boost::throw_exception (DCPReadError ("could not decode JPEG2000 codestream"));
        }
 
        opj_cio_close (cio);
@@ -230,8 +202,22 @@ libdcp::decompress_j2k (uint8_t* data, int64_t size, int reduce)
  *  @return RGB image.
  */
 shared_ptr<ARGBFrame>
-libdcp::xyz_to_rgb (opj_image_t* xyz_frame)
+libdcp::xyz_to_rgb (opj_image_t* xyz_frame, shared_ptr<const GammaLUT> lut_in, shared_ptr<const GammaLUT> lut_out)
 {
+       float const dci_coefficient = 48.0 / 52.37;
+
+        /* sRGB color matrix for XYZ -> RGB.  This is the same as the one used by the Fraunhofer
+          EasyDCP player, I think.
+       */
+
+       float const colour_matrix[3][3] = {
+               {  3.24096989631653,   -1.5373831987381,  -0.498610764741898 },
+               { -0.96924364566803,    1.87596750259399,  0.0415550582110882 },
+               {  0.0556300804018974, -0.203976958990097, 1.05697154998779 }
+       };
+
+       int const max_colour = pow (2, lut_out->bit_depth()) - 1;
+
        struct {
                double x, y, z;
        } s;
@@ -244,7 +230,7 @@ libdcp::xyz_to_rgb (opj_image_t* xyz_frame)
        int* xyz_y = xyz_frame->comps[1].data;
        int* xyz_z = xyz_frame->comps[2].data;
 
-       shared_ptr<ARGBFrame> argb_frame (new ARGBFrame (xyz_frame->x1, xyz_frame->y1));
+       shared_ptr<ARGBFrame> argb_frame (new ARGBFrame (Size (xyz_frame->x1, xyz_frame->y1)));
 
        uint8_t* argb = argb_frame->data ();
        
@@ -255,19 +241,19 @@ libdcp::xyz_to_rgb (opj_image_t* xyz_frame)
                        assert (*xyz_x >= 0 && *xyz_y >= 0 && *xyz_z >= 0 && *xyz_x < 4096 && *xyz_x < 4096 && *xyz_z < 4096);
                        
                        /* In gamma LUT */
-                       s.x = lut_in[*xyz_x++];
-                       s.y = lut_in[*xyz_y++];
-                       s.z = lut_in[*xyz_z++];
-                       
+                       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;
+                       s.x /= dci_coefficient;
+                       s.y /= dci_coefficient;
+                       s.z /= dci_coefficient;
                        
                        /* XYZ to RGB */
-                       d.r = ((s.x * color_matrix[0][0]) + (s.y * color_matrix[0][1]) + (s.z * color_matrix[0][2]));
-                       d.g = ((s.x * color_matrix[1][0]) + (s.y * color_matrix[1][1]) + (s.z * color_matrix[1][2]));
-                       d.b = ((s.x * color_matrix[2][0]) + (s.y * color_matrix[2][1]) + (s.z * color_matrix[2][2]));
+                       d.r = ((s.x * colour_matrix[0][0]) + (s.y * colour_matrix[0][1]) + (s.z * colour_matrix[0][2]));
+                       d.g = ((s.x * colour_matrix[1][0]) + (s.y * colour_matrix[1][1]) + (s.z * colour_matrix[1][2]));
+                       d.b = ((s.x * colour_matrix[2][0]) + (s.y * colour_matrix[2][1]) + (s.z * colour_matrix[2][2]));
                        
                        d.r = min (d.r, 1.0);
                        d.r = max (d.r, 0.0);
@@ -279,9 +265,9 @@ libdcp::xyz_to_rgb (opj_image_t* xyz_frame)
                        d.b = max (d.b, 0.0);
                        
                        /* Out gamma LUT */
-                       *argb_line++ = lut_out[(int) (d.b * COLOR_DEPTH)];
-                       *argb_line++ = lut_out[(int) (d.g * COLOR_DEPTH)];
-                       *argb_line++ = lut_out[(int) (d.r * COLOR_DEPTH)];
+                       *argb_line++ = lut_out->lut()[(int) (d.b * max_colour)] * 0xff;
+                       *argb_line++ = lut_out->lut()[(int) (d.g * max_colour)] * 0xff;
+                       *argb_line++ = lut_out->lut()[(int) (d.r * max_colour)] * 0xff;
                        *argb_line++ = 0xff;
                }
                
@@ -305,3 +291,14 @@ libdcp::empty_or_white_space (string s)
 
        return true;
 }
+
+bool libdcp::operator== (libdcp::Size const & a, libdcp::Size const & b)
+{
+       return (a.width == b.width && a.height == b.height);
+}
+
+bool libdcp::operator!= (libdcp::Size const & a, libdcp::Size const & b)
+{
+       return !(a == b);
+}
+