mirror of https://github.com/GNOME/gimp.git
356 lines
10 KiB
C
356 lines
10 KiB
C
/* LIBGIMP - The GIMP Library
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* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
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*
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* gimpdrawable.c
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include "gimp.h"
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#define TILE_WIDTH gimp_tile_width()
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#define TILE_HEIGHT gimp_tile_height()
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/**
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* gimp_drawable_get:
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* @drawable_ID: the ID of the drawable
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*
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* This function creates a #GimpDrawable structure for the core
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* drawable identified by @drawable_ID. The returned structure
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* contains some basic information about the drawable and can also
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* hold tile data for transfer to and from the core.
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*
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* Note that the name of this function is somewhat misleading, because
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* it suggests that it simply returns a handle. This is not the case:
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* if the function is called multiple times, it creates separate tile
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* lists each time, which will usually produce undesired results.
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*
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* When a plug-in has finished working with a drawable, before exiting
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* it should call gimp_drawable_detach() to make sure that all tile data is
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* transferred back to the core.
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*
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* Return value: a new #GimpDrawable wrapper
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**/
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GimpDrawable *
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gimp_drawable_get (gint32 drawable_ID)
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{
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GimpDrawable *drawable;
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gint width;
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gint height;
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gint bpp;
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width = gimp_drawable_width (drawable_ID);
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height = gimp_drawable_height (drawable_ID);
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bpp = gimp_drawable_bpp (drawable_ID);
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g_return_val_if_fail (width > 0 && height > 0 && bpp > 0, NULL);
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drawable = g_slice_new0 (GimpDrawable);
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drawable->drawable_id = drawable_ID;
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drawable->width = width;
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drawable->height = height;
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drawable->bpp = bpp;
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drawable->ntile_rows = (height + TILE_HEIGHT - 1) / TILE_HEIGHT;
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drawable->ntile_cols = (width + TILE_WIDTH - 1) / TILE_WIDTH;
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return drawable;
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}
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/**
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* gimp_drawable_detach:
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* @drawable: The #GimpDrawable to detach from the core
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*
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* This function is called when a plug-in is finished working
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* with a drawable. It forces all tile data held in the tile
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* list of the #GimpDrawable to be transferred to the core, and
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* then frees all associated memory. You must not access the
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* @drawable after having called gimp_drawable_detach().
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**/
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void
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gimp_drawable_detach (GimpDrawable *drawable)
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{
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g_return_if_fail (drawable != NULL);
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gimp_drawable_flush (drawable);
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if (drawable->tiles)
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g_free (drawable->tiles);
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if (drawable->shadow_tiles)
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g_free (drawable->shadow_tiles);
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g_slice_free (GimpDrawable, drawable);
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}
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/**
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* gimp_drawable_flush:
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* @drawable: The #GimpDrawable whose tile data is to be transferred
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* to the core.
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*
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* This function causes all tile data in the tile list of @drawable to be
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* transferred to the core. It is usually called in situations where a
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* plug-in acts on a drawable, and then needs to read the results of its
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* actions. Data transferred back from the core will not generally be valid
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* unless gimp_drawable_flush() has been called beforehand.
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**/
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void
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gimp_drawable_flush (GimpDrawable *drawable)
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{
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GimpTile *tiles;
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gint n_tiles;
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gint i;
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g_return_if_fail (drawable != NULL);
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if (drawable->tiles)
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{
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tiles = drawable->tiles;
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n_tiles = drawable->ntile_rows * drawable->ntile_cols;
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for (i = 0; i < n_tiles; i++)
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if ((tiles[i].ref_count > 0) && tiles[i].dirty)
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gimp_tile_flush (&tiles[i]);
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}
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if (drawable->shadow_tiles)
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{
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tiles = drawable->shadow_tiles;
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n_tiles = drawable->ntile_rows * drawable->ntile_cols;
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for (i = 0; i < n_tiles; i++)
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if ((tiles[i].ref_count > 0) && tiles[i].dirty)
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gimp_tile_flush (&tiles[i]);
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}
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/* nuke all references to this drawable from the cache */
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_gimp_tile_cache_flush_drawable (drawable);
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}
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GimpTile *
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gimp_drawable_get_tile (GimpDrawable *drawable,
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gboolean shadow,
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gint row,
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gint col)
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{
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GimpTile *tiles;
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guint right_tile;
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guint bottom_tile;
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gint n_tiles;
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gint tile_num;
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gint i, j, k;
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g_return_val_if_fail (drawable != NULL, NULL);
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if (shadow)
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tiles = drawable->shadow_tiles;
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else
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tiles = drawable->tiles;
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if (! tiles)
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{
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n_tiles = drawable->ntile_rows * drawable->ntile_cols;
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tiles = g_new (GimpTile, n_tiles);
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right_tile = (drawable->width -
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((drawable->ntile_cols - 1) * TILE_WIDTH));
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bottom_tile = (drawable->height -
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((drawable->ntile_rows - 1) * TILE_HEIGHT));
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for (i = 0, k = 0; i < drawable->ntile_rows; i++)
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{
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for (j = 0; j < drawable->ntile_cols; j++, k++)
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{
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tiles[k].bpp = drawable->bpp;
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tiles[k].tile_num = k;
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tiles[k].ref_count = 0;
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tiles[k].dirty = FALSE;
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tiles[k].shadow = shadow;
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tiles[k].data = NULL;
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tiles[k].drawable = drawable;
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if (j == (drawable->ntile_cols - 1))
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tiles[k].ewidth = right_tile;
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else
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tiles[k].ewidth = TILE_WIDTH;
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if (i == (drawable->ntile_rows - 1))
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tiles[k].eheight = bottom_tile;
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else
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tiles[k].eheight = TILE_HEIGHT;
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}
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}
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if (shadow)
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drawable->shadow_tiles = tiles;
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else
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drawable->tiles = tiles;
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}
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tile_num = row * drawable->ntile_cols + col;
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return &tiles[tile_num];
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}
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GimpTile *
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gimp_drawable_get_tile2 (GimpDrawable *drawable,
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gboolean shadow,
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gint x,
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gint y)
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{
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gint row;
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gint col;
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g_return_val_if_fail (drawable != NULL, NULL);
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col = x / TILE_WIDTH;
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row = y / TILE_HEIGHT;
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return gimp_drawable_get_tile (drawable, shadow, row, col);
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}
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void
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gimp_drawable_get_color_uchar (gint32 drawable_ID,
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const GimpRGB *color,
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guchar *color_uchar)
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{
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g_return_if_fail (color != NULL);
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g_return_if_fail (color_uchar != NULL);
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switch (gimp_drawable_type (drawable_ID))
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{
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case GIMP_RGB_IMAGE:
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gimp_rgb_get_uchar (color,
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&color_uchar[0], &color_uchar[1], &color_uchar[2]);
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color_uchar[3] = 255;
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break;
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case GIMP_RGBA_IMAGE:
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gimp_rgba_get_uchar (color,
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&color_uchar[0], &color_uchar[1], &color_uchar[2],
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&color_uchar[3]);
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break;
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case GIMP_GRAY_IMAGE:
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color_uchar[0] = gimp_rgb_luminance_uchar (color);
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color_uchar[1] = 255;
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break;
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case GIMP_GRAYA_IMAGE:
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color_uchar[0] = gimp_rgb_luminance_uchar (color);
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gimp_rgba_get_uchar (color, NULL, NULL, NULL, &color_uchar[1]);
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break;
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default:
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break;
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}
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}
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guchar *
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gimp_drawable_get_thumbnail_data (gint32 drawable_ID,
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gint *width,
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gint *height,
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gint *bpp)
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{
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gint ret_width;
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gint ret_height;
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guchar *image_data;
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gint data_size;
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_gimp_drawable_thumbnail (drawable_ID,
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*width,
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*height,
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&ret_width,
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&ret_height,
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bpp,
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&data_size,
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&image_data);
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*width = ret_width;
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*height = ret_height;
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return image_data;
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}
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guchar *
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gimp_drawable_get_sub_thumbnail_data (gint32 drawable_ID,
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gint src_x,
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gint src_y,
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gint src_width,
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gint src_height,
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gint *dest_width,
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gint *dest_height,
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gint *bpp)
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{
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gint ret_width;
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gint ret_height;
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guchar *image_data;
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gint data_size;
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_gimp_drawable_sub_thumbnail (drawable_ID,
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src_x, src_y,
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src_width, src_height,
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*dest_width,
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*dest_height,
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&ret_width,
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&ret_height,
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bpp,
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&data_size,
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&image_data);
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*dest_width = ret_width;
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*dest_height = ret_height;
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return image_data;
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}
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/**
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* gimp_drawable_attach_new_parasite:
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* @drawable_ID: the ID of the #GimpDrawable to attach the #GimpParasite to.
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* @name: the name of the #GimpParasite to create and attach.
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* @flags: the flags set on the #GimpParasite.
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* @size: the size of the parasite data in bytes.
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* @data: a pointer to the data attached with the #GimpParasite.
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*
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* Convenience function that creates a parasite and attaches it
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* to GIMP.
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*
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* Return value: TRUE on successful creation and attachment of
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* the new parasite.
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*
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* See Also: gimp_drawable_parasite_attach()
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*/
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gboolean
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gimp_drawable_attach_new_parasite (gint32 drawable_ID,
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const gchar *name,
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gint flags,
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gint size,
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gconstpointer data)
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{
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GimpParasite *parasite = gimp_parasite_new (name, flags, size, data);
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gboolean success;
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success = gimp_drawable_parasite_attach (drawable_ID, parasite);
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gimp_parasite_free (parasite);
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return success;
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}
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