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- /*
- * Semi-Flatten plug-in v1.0 by Adam D. Moss, adam@foxbox.org. 1998/01/27
- */
-
- /* The GIMP -- an image manipulation program
- * Copyright (C) 1995 Spencer Kimball and Peter Mattis
- *
- * 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
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
- /*
- * TODO:
- * Use tile iteration instead of dumb row-walking
- */
-
- #include "config.h"
-
- #include <stdio.h>
- #include <stdlib.h>
-
- #include <libgimp/gimp.h>
-
- #include "libgimp/stdplugins-intl.h"
-
-
- /* Declare local functions.
- */
- static void query (void);
- static void run (gchar *name,
- gint nparams,
- GimpParam *param,
- gint *nreturn_vals,
- GimpParam **return_vals);
-
- static void semiflatten (GimpDrawable *drawable);
- static void semiflatten_render_row (const guchar *src_row,
- guchar *dest_row,
- gint row,
- gint row_width,
- gint bytes);
-
-
- static guchar bgred, bggreen, bgblue;
-
-
- GimpPlugInInfo PLUG_IN_INFO =
- {
- NULL, /* init_proc */
- NULL, /* quit_proc */
- query, /* query_proc */
- run, /* run_proc */
- };
-
- MAIN ()
-
- static void
- query (void)
- {
- static GimpParamDef args[] =
- {
- { GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },
- { GIMP_PDB_IMAGE, "image", "Input image (unused)" },
- { GIMP_PDB_DRAWABLE, "drawable", "Input drawable" }
- };
- static gint nargs = sizeof (args) / sizeof (args[0]);
-
- gimp_install_procedure ("plug_in_semiflatten",
- "Flatten pixels in an RGBA image that aren't "
- "completely transparent against the current GIMP "
- "background color",
- "This plugin flattens pixels in an RGBA image that "
- "aren't completely transparent against the current "
- "GIMP background color",
- "Adam D. Moss (adam@foxbox.org)",
- "Adam D. Moss (adam@foxbox.org)",
- "27th January 1998",
- N_("<Image>/Filters/Colors/Semi-Flatten"),
- "RGBA",
- GIMP_PLUGIN,
- nargs, 0,
- args, NULL);
- }
-
-
- static void
- run (gchar *name,
- gint nparams,
- GimpParam *param,
- gint *nreturn_vals,
- GimpParam **return_vals)
- {
- static GimpParam values[1];
- GimpDrawable *drawable;
- gint32 image_ID;
- GimpPDBStatusType status = GIMP_PDB_SUCCESS;
-
- *nreturn_vals = 1;
- *return_vals = values;
-
- values[0].type = GIMP_PDB_STATUS;
- values[0].data.d_status = status;
-
- INIT_I18N();
-
- /* Get the specified drawable */
- drawable = gimp_drawable_get (param[2].data.d_drawable);
- image_ID = param[1].data.d_image;
-
- if (status == GIMP_PDB_SUCCESS)
- {
- /* Make sure that the drawable is indexed or RGB color */
- if (gimp_drawable_is_rgb (drawable->id))
- {
- gimp_progress_init ( _("Semi-Flatten..."));
- gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width ()
- + 1));
- semiflatten (drawable);
- gimp_displays_flush ();
- }
- else
- {
- status = GIMP_PDB_EXECUTION_ERROR;
- }
- }
-
- values[0].data.d_status = status;
-
- gimp_drawable_detach (drawable);
- }
-
-
- static void
- semiflatten_render_row (const guchar *src_row,
- guchar *dest_row,
- gint row,
- gint row_width,
- gint bytes)
- {
- gint col;
-
- for (col = 0; col < row_width ; col++)
- {
- dest_row[col*bytes+0] =
- (src_row[col*bytes+0]*src_row[col*bytes+3])/255 +
- (bgred*(255-src_row[col*bytes+3]))/255;
-
- dest_row[col*bytes+1] =
- (src_row[col*bytes+1]*src_row[col*bytes+3])/255 +
- (bggreen*(255-src_row[col*bytes+3]))/255;
-
- dest_row[col*bytes+2] =
- (src_row[col*bytes+2]*src_row[col*bytes+3])/255 +
- (bgblue*(255-src_row[col*bytes+3]))/255;
-
- dest_row[col*bytes+3] = (src_row[col*bytes+3] == 0) ? 0 : 255;
- }
- }
-
-
- static void
- semiflatten (GimpDrawable *drawable)
- {
- GimpPixelRgn srcPR, destPR;
- gint width, height;
- gint bytes;
- guchar *src_row;
- guchar *dest_row;
- gint row;
- gint x1, y1, x2, y2;
-
- /* Fetch the GIMP current background colour, to semi-flatten against */
- gimp_palette_get_background (&bgred, &bggreen, &bgblue);
-
- /* Get the input area. This is the bounding box of the selection in
- * the image (or the entire image if there is no selection). Only
- * operating on the input area is simply an optimization. It doesn't
- * need to be done for correct operation. (It simply makes it go
- * faster, since fewer pixels need to be operated on).
- */
- gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
-
- /* Get the size of the input image. (This will/must be the same
- * as the size of the output image.
- */
- width = drawable->width;
- height = drawable->height;
- bytes = drawable->bpp;
-
- /* allocate row buffers */
- src_row = g_new (guchar, (x2 - x1) * bytes);
- dest_row = g_new (guchar, (x2 - x1) * bytes);
-
- /* initialize the pixel regions */
- gimp_pixel_rgn_init (&srcPR, drawable, 0, 0, width, height, FALSE, FALSE);
- gimp_pixel_rgn_init (&destPR, drawable, 0, 0, width, height, TRUE, TRUE);
-
- for (row = y1; row < y2; row++)
- {
- gimp_pixel_rgn_get_row (&srcPR, src_row, x1, row, (x2 - x1));
-
- semiflatten_render_row (src_row,
- dest_row,
- row,
- (x2 - x1),
- bytes);
-
- /* store the dest */
- gimp_pixel_rgn_set_row (&destPR, dest_row, x1, row, (x2 - x1));
-
- if ((row % 10) == 0)
- gimp_progress_update ((double) row / (double) (y2 - y1));
- }
-
- /* update the processed region */
- gimp_drawable_flush (drawable);
- gimp_drawable_merge_shadow (drawable->id, TRUE);
- gimp_drawable_update (drawable->id, x1, y1, (x2 - x1), (y2 - y1));
-
- free (src_row);
- free (dest_row);
- }
-