/* This file is an image processing operation for GEGL
*
* GEGL is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* GEGL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with GEGL; if not, see .
*
* Copyright 2011 Rasmus Hahn
*/
#ifdef GEGL_CHANT_PROPERTIES
gegl_chant_string (path, "File", "", "path of file to write to.")
gegl_chant_int (tile, "Tile", 0, 2048, 0, "tile size to use.")
#else
#define GEGL_CHANT_TYPE_SINK
#define GEGL_CHANT_C_FILE "exr-save.cc"
extern "C" {
#include "gegl-chant.h"
} /* extern "C" */
#include "config.h"
#include
#include
#include
#include
/**
* create an Imf::Header for writing up to 4 channels (given in d).
* d must be between 1 and 4.
*/
static Imf::Header
create_header (int w,
int h,
int d)
{
Imf::Header header (w, h);
Imf::FrameBuffer fbuf;
if (d <= 2)
{
header.channels ().insert ("Y", Imf::Channel (Imf::FLOAT));
}
else
{
header.channels ().insert ("R", Imf::Channel (Imf::FLOAT));
header.channels ().insert ("G", Imf::Channel (Imf::FLOAT));
header.channels ().insert ("B", Imf::Channel (Imf::FLOAT));
}
if (d == 2 || d == 4)
{
header.channels ().insert ("A", Imf::Channel (Imf::FLOAT));
}
return header;
}
/**
* create an Imf::FrameBuffer object for w*h*d floats and return it.
*/
static Imf::FrameBuffer
create_frame_buffer (int w,
int h,
int d,
const float *data)
{
Imf::FrameBuffer fbuf;
if (d <= 2)
{
fbuf.insert ("Y", Imf::Slice (Imf::FLOAT, (char *) (&data[0] + 0),
d * sizeof *data, d * sizeof *data * w));
}
else
{
fbuf.insert ("R", Imf::Slice (Imf::FLOAT, (char *) (&data[0] + 0),
d * sizeof *data, d * sizeof *data * w));
fbuf.insert ("G", Imf::Slice (Imf::FLOAT, (char *) (&data[0] + 1),
d * sizeof *data, d * sizeof *data * w));
fbuf.insert ("B", Imf::Slice (Imf::FLOAT, (char *) (&data[0] + 2),
d * sizeof *data, d * sizeof *data * w));
}
if (d == 2 || d == 4)
{
fbuf.insert ("A", Imf::Slice (Imf::FLOAT, (char *) (&data[0] + (d - 1)),
d * sizeof *data, d * sizeof *data * w));
}
return fbuf;
}
/**
* write the float buffer to an exr file with tile-size tw x th.
* The buffer must contain w*h*d floats.
* Currently supported are only values 1-4 for d:
* d=1: write a single Y-channel.
* d=2: write Y and A.
* d=3: write RGB.
* d=4: write RGB and A.
*/
static void
write_tiled_exr (const float *pixels,
int w,
int h,
int d,
int tw,
int th,
const std::string &filename)
{
Imf::Header header (create_header (w, h, d));
header.setTileDescription (Imf::TileDescription (tw, th, Imf::ONE_LEVEL));
Imf::TiledOutputFile out (filename.c_str (), header);
Imf::FrameBuffer fbuf (create_frame_buffer (w, h, d, pixels));
out.setFrameBuffer (fbuf);
out.writeTiles (0, out.numXTiles () - 1, 0, out.numYTiles () - 1);
}
/**
* write an openexr file in scanline mode.
* pixels contains the image data as an array of w*h*d floats.
* The data is written to the file named filename.
*/
static void
write_scanline_exr (const float *pixels,
int w,
int h,
int d,
const std::string &filename)
{
Imf::Header header (create_header (w, h, d));
Imf::OutputFile out (filename.c_str (), header);
Imf::FrameBuffer fbuf (create_frame_buffer (w, h, d, pixels));
out.setFrameBuffer (fbuf);
out.writePixels (h);
}
/**
* write the given pixel buffer, which is w * h * d to filename using the
* tilesize as tile width and height. This is the only function calling
* the openexr lib and therefore should be exception save.
*/
static void
exr_save_process (const float *pixels,
int w,
int h,
int d,
int tile_size,
const std::string &filename)
{
if (tile_size == 0)
{
/* write a scanline exr image. */
write_scanline_exr (pixels, w, h, d, filename);
}
else
{
/* write a tiled exr image. */
write_tiled_exr (pixels, w, h, d, tile_size, tile_size, filename);
}
}
/**
* main entry function for the exr saver.
*/
static gboolean
gegl_exr_save_process (GeglOperation *operation,
GeglBuffer *input,
const GeglRectangle *rect,
gint level)
{
GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
std::string filename (o->path);
std::string output_format;
int tile_size (o->tile);
/*
* determine the number of channels in the input buffer and determine
* format, data is written with. Currently this only checks for the
* numbers of channels and writes only Y or RGB data with optional alpha.
*/
const Babl *original_format = gegl_buffer_get_format (input);
unsigned depth = babl_format_get_n_components (original_format);
switch (depth)
{
case 1: output_format = "Y float"; break;
case 2: output_format = "YA float"; break;
case 3: output_format = "RGB float"; break;
case 4: output_format = "RGBA float"; break;
default:
g_warning ("exr-save: cannot write exr with depth %d.", depth);
return FALSE;
break;
}
/*
* get the pixel data. The position of the rectangle is effectively
* ignored. Always write a file width x height; @todo: check if exr
* can set the origin.
*/
float *pixels
= (float *) g_malloc (rect->width * rect->height * depth * sizeof *pixels);
if (pixels == 0)
{
g_warning ("exr-save: could allocate %d*%d*%d pixels.",
rect->width, rect->height, depth);
return FALSE;
}
gegl_buffer_get (input, rect, 1.0, babl_format (output_format.c_str ()),
pixels, GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
bool status;
try
{
exr_save_process (pixels, rect->width, rect->height,
depth, tile_size, filename);
status = TRUE;
}
catch (std::exception &e)
{
g_warning ("exr-save: failed to write to '%s': %s",
filename.c_str (), e.what ());
status = FALSE;
}
g_free (pixels);
return status;
}
static void gegl_chant_class_init (GeglChantClass *klass)
{
GeglOperationClass *operation_class;
GeglOperationSinkClass *sink_class;
operation_class = GEGL_OPERATION_CLASS (klass);
sink_class = GEGL_OPERATION_SINK_CLASS (klass);
sink_class->process = gegl_exr_save_process;
sink_class->needs_full = TRUE;
gegl_operation_class_set_keys (operation_class,
"name" , "gegl:exr-save",
"categories" , "output",
"description" , "OpenEXR image saver",
NULL);
gegl_extension_handler_register_saver (".exr", "gegl:exr-save");
}
#endif