mirror of https://github.com/GNOME/gimp.git
117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* gimp-gegl-utils.h
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* Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gegl.h>
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#include "gimp-gegl-types.h"
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#include "base/tile-manager.h"
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#include "gimp-gegl-utils.h"
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/**
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* gimp_bpp_to_babl_format:
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* @bpp: bytes per pixel
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* @linear: whether the pixels are linear or gamma-corrected.
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*
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* Return the Babl format to use for a given number of bytes per pixel.
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* This function assumes that the data is 8bit.
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*
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* Return value: the Babl format to use
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**/
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const Babl *
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gimp_bpp_to_babl_format (guint bpp,
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gboolean linear)
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{
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g_return_val_if_fail (bpp > 0 && bpp <= 4, NULL);
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if (linear)
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{
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switch (bpp)
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{
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case 1:
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return babl_format ("Y u8");
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case 2:
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return babl_format ("YA u8");
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case 3:
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return babl_format ("RGB u8");
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case 4:
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return babl_format ("RGBA u8");
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}
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}
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else
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{
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switch (bpp)
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{
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case 1:
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return babl_format ("Y' u8");
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case 2:
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return babl_format ("Y'A u8");
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case 3:
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return babl_format ("R'G'B' u8");
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case 4:
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return babl_format ("R'G'B'A u8");
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}
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}
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return NULL;
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}
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static gint
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gimp_babl_format_to_legacy_bpp (const Babl *format)
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{
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return babl_format_get_n_components (format);
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}
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TileManager *
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gimp_buffer_to_tiles (GeglBuffer *buffer)
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{
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const Babl *format = gegl_buffer_get_format (buffer);
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TileManager *new_tiles = NULL;
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GeglNode *source = NULL;
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GeglNode *sink = NULL;
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g_return_val_if_fail (buffer != NULL, NULL);
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/* Setup and process the graph */
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new_tiles = tile_manager_new (gegl_buffer_get_width (buffer),
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gegl_buffer_get_height (buffer),
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gimp_babl_format_to_legacy_bpp (format));
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source = gegl_node_new_child (NULL,
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"operation", "gegl:buffer-source",
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"buffer", buffer,
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NULL);
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sink = gegl_node_new_child (NULL,
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"operation", "gimp:tilemanager-sink",
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"tile-manager", new_tiles,
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NULL);
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gegl_node_link_many (source, sink, NULL);
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gegl_node_process (sink);
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/* Clenaup */
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g_object_unref (sink);
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g_object_unref (source);
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return new_tiles;
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}
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