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- /* The GIMP -- an image manipulation program
- * Copyright (C) 1995 Spencer Kimball and Peter Mattis
- *
- * Apply lens plug-in --- makes your selected part of the image look like it
- * is viewed under a solid lens.
- * Copyright (C) 1997 Morten Eriksen
- * mortene@pvv.ntnu.no
- * (If you do anything cool with this plug-in, or have ideas for
- * improvements (which aren't on my ToDo-list) - send me an email).
- *
- * 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.
- */
-
- /* Version 0.1:
- *
- * First release. No known serious bugs, and basically does what you want.
- * All fancy features postponed until the next release, though. :)
- *
- */
-
- /*
- TO DO:
- - antialiasing
- - preview image
- - adjustable (R, G, B and A) filter
- - optimize for speed!
- - refraction index warning dialog box when value < 1.0
- - use "true" lens with specified thickness
- - option to apply inverted lens
- - adjustable "c" value in the ellipsoid formula
- - radiobuttons for "ellipsoid" or "only horiz" and "only vert" (like in the
- Ad*b* Ph*t*sh*p Spherify plug-in..)
- - clean up source code
- */
-
- #include "config.h"
-
- #include <stdio.h>
- #include <stdlib.h>
-
- #include <gtk/gtk.h>
-
- #include <libgimp/gimp.h>
- #include <libgimp/gimpui.h>
-
- #include "libgimp/stdplugins-intl.h"
-
- #define ENTRY_WIDTH 100
-
- /* Declare local functions.
- */
- static void query (void);
- static void run (gchar *name,
- gint nparams,
- GimpParam *param,
- gint *nreturn_vals,
- GimpParam **return_vals);
-
- static void drawlens (GimpDrawable *drawable);
-
- static gint lens_dialog (GimpDrawable *drawable);
-
- GimpPlugInInfo PLUG_IN_INFO =
- {
- NULL, /* init_proc */
- NULL, /* quit_proc */
- query, /* query_proc */
- run, /* run_proc */
- };
-
- typedef struct
- {
- gdouble refraction;
- gint keep_surr;
- gint use_bkgr;
- gint set_transparent;
- } LensValues;
-
- static LensValues lvals =
- {
- /* Lens refraction value */
- 1.7,
- /* Surroundings options */
- TRUE, FALSE, FALSE
- };
-
- typedef struct
- {
- gint run;
- } LensInterface;
-
- static LensInterface bint =
- {
- FALSE /* run */
- };
-
- 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" },
- { GIMP_PDB_FLOAT, "refraction", "Lens refraction index" },
- { GIMP_PDB_INT32, "keep_surroundings", "Keep lens surroundings" },
- { GIMP_PDB_INT32, "set_background", "Set lens surroundings to bkgr value" },
- { GIMP_PDB_INT32, "set_transparent", "Set lens surroundings transparent" }
- };
- static gint nargs = sizeof (args)/ sizeof (args[0]);
-
- gimp_install_procedure ("plug_in_applylens",
- "Apply a lens effect",
- "This plug-in uses Snell's law to draw an ellipsoid lens over the image",
- "Morten Eriksen",
- "Morten Eriksen",
- "1997",
- N_("<Image>/Filters/Glass Effects/Apply Lens..."),
- "RGB*, GRAY*, INDEXED*",
- 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;
- GimpRunModeType run_mode;
- GimpPDBStatusType status = GIMP_PDB_SUCCESS;
-
- INIT_I18N_UI();
-
- run_mode = param[0].data.d_int32;
-
- values[0].type = GIMP_PDB_STATUS;
- values[0].data.d_status = status;
-
- *nreturn_vals = 1;
- *return_vals = values;
-
- drawable = gimp_drawable_get (param[2].data.d_drawable);
-
- switch(run_mode)
- {
- case GIMP_RUN_INTERACTIVE:
- gimp_get_data ("plug_in_applylens", &lvals);
- if(!lens_dialog (drawable))
- return;
- break;
-
- case GIMP_RUN_NONINTERACTIVE:
- if (nparams != 7)
- status = GIMP_PDB_CALLING_ERROR;
-
- if (status == GIMP_PDB_SUCCESS)
- {
- lvals.refraction = param[3].data.d_float;
- lvals.keep_surr = param[4].data.d_int32;
- lvals.use_bkgr = param[5].data.d_int32;
- lvals.set_transparent = param[6].data.d_int32;
- }
-
- if (status == GIMP_PDB_SUCCESS && (lvals.refraction < 1.0))
- status = GIMP_PDB_CALLING_ERROR;
- break;
-
- case GIMP_RUN_WITH_LAST_VALS:
- gimp_get_data ("plug_in_applylens", &lvals);
- break;
-
- default:
- break;
- }
-
- gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));
- gimp_progress_init (_("Applying lens..."));
- drawlens (drawable);
-
- if (run_mode != GIMP_RUN_NONINTERACTIVE)
- gimp_displays_flush ();
- if (run_mode == GIMP_RUN_INTERACTIVE)
- gimp_set_data ("plug_in_applylens", &lvals, sizeof (LensValues));
-
- values[0].data.d_status = status;
-
- gimp_drawable_detach (drawable);
- }
-
- /*
- Ellipsoid formula: x^2/a^2 + y^2/b^2 + z^2/c^2 = 1
- */
- static void
- find_projected_pos (gfloat a,
- gfloat b,
- gfloat x,
- gfloat y,
- gfloat *projx,
- gfloat *projy)
- {
- gfloat c;
- gfloat n[3];
- gfloat nxangle, nyangle, theta1, theta2;
- gfloat ri1 = 1.0;
- gfloat ri2 = lvals.refraction;
-
- /* PARAM */
- c = MIN (a, b);
-
- n[0] = x;
- n[1] = y;
- n[2] = sqrt ((1 - x * x / (a * a) - y * y / (b * b)) * (c * c));
-
- nxangle = acos (n[0] / sqrt(n[0] * n[0] + n[2] * n[2]));
- theta1 = G_PI / 2 - nxangle;
- theta2 = asin (sin (theta1) * ri1 / ri2);
- theta2 = G_PI / 2 - nxangle - theta2;
- *projx = x - tan (theta2) * n[2];
-
- nyangle = acos (n[1]/sqrt (n[1] * n[1] + n[2] * n[2]));
- theta1 = G_PI / 2 - nyangle;
- theta2 = asin (sin (theta1) * ri1 / ri2);
- theta2 = G_PI / 2 - nyangle - theta2;
- *projy = y - tan (theta2) * n[2];
- }
-
- static void
- drawlens (GimpDrawable *drawable)
- {
- GimpPixelRgn srcPR, destPR;
- gint width, height;
- gint bytes;
- gint row;
- gint x1, y1, x2, y2;
- guchar *src, *dest;
- gint i, col;
- gfloat regionwidth, regionheight, dx, dy, xsqr, ysqr;
- gfloat a, b, asqr, bsqr, x, y;
- glong pixelpos, pos;
- guchar bgr_red, bgr_blue, bgr_green, alphaval;
- GimpImageType drawtype = gimp_drawable_type (drawable->id);
-
- gimp_palette_get_background (&bgr_red, &bgr_green, &bgr_blue);
-
- gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
- regionwidth = x2 - x1;
- a = regionwidth / 2;
- regionheight = y2 - y1;
- b = regionheight / 2;
-
- asqr = a * a;
- bsqr = b * b;
-
- width = drawable->width;
- height = drawable->height;
- bytes = drawable->bpp;
-
- gimp_pixel_rgn_init (&srcPR, drawable, 0, 0, width, height, FALSE, FALSE);
- gimp_pixel_rgn_init (&destPR, drawable, 0, 0, width, height, TRUE, TRUE);
-
- src = g_malloc ((x2 - x1) * (y2 - y1) * bytes);
- dest = g_malloc ((x2 - x1) * (y2 - y1) * bytes);
- gimp_pixel_rgn_get_rect (&srcPR, src, x1, y1, regionwidth, regionheight);
-
- for (col = 0; col < regionwidth; col++)
- {
- dx = (gfloat) col - a + 0.5;
- xsqr = dx * dx;
- for (row = 0; row < regionheight; row++)
- {
- pixelpos = (col + row * regionwidth) * bytes;
- dy = -((gfloat) row - b) - 0.5;
- ysqr = dy * dy;
- if (ysqr < (bsqr - (bsqr * xsqr) / asqr))
- {
- find_projected_pos (a, b, dx, dy, &x, &y);
- y = -y;
- pos = ((gint) (y + b) * regionwidth + (gint) (x + a)) * bytes;
-
- for (i = 0; i < bytes; i++)
- {
- dest[pixelpos + i] = src[pos + i];
- }
- }
- else
- {
- if (lvals.keep_surr)
- {
- for (i = 0; i < bytes; i++)
- {
- dest[pixelpos + i] = src[pixelpos + i];
- }
- }
- else
- {
- if (lvals.set_transparent)
- alphaval = 0;
- else
- alphaval = 255;
-
- switch (drawtype)
- {
- case GIMP_INDEXEDA_IMAGE:
- dest[pixelpos + 1] = alphaval;
- case GIMP_INDEXED_IMAGE:
- dest[pixelpos + 0] = 0;
- break;
-
- case GIMP_RGBA_IMAGE:
- dest[pixelpos + 3] = alphaval;
- case GIMP_RGB_IMAGE:
- dest[pixelpos + 0] = bgr_red;
- dest[pixelpos + 1] = bgr_green;
- dest[pixelpos + 2] = bgr_blue;
- break;
-
- case GIMP_GRAYA_IMAGE:
- dest[pixelpos + 1] = alphaval;
- case GIMP_GRAY_IMAGE:
- dest[pixelpos+0] = bgr_red;
- break;
- }
- }
- }
- }
-
- if (((gint) (regionwidth-col) % 5) == 0)
- gimp_progress_update ((gdouble) col / (gdouble) regionwidth);
- }
-
- gimp_pixel_rgn_set_rect (&destPR, dest, x1, y1, regionwidth, regionheight);
- g_free (src);
- g_free (dest);
-
- gimp_drawable_flush (drawable);
- gimp_drawable_merge_shadow (drawable->id, TRUE);
- gimp_drawable_update (drawable->id, x1, y1, (x2 - x1), (y2 - y1));
- }
-
- static void
- lens_ok_callback (GtkWidget *widget,
- gpointer data)
- {
- bint.run = TRUE;
-
- gtk_widget_destroy (GTK_WIDGET (data));
- }
-
- static gint
- lens_dialog (GimpDrawable *drawable)
- {
- GtkWidget *dlg;
- GtkWidget *label;
- GtkWidget *toggle;
- GtkWidget *frame;
- GtkWidget *vbox;
- GtkWidget *sep;
- GtkWidget *hbox;
- GtkWidget *spinbutton;
- GtkObject *adj;
- GSList *group = NULL;
- GimpImageType drawtype;
-
- drawtype = gimp_drawable_type (drawable->id);
-
- gimp_ui_init ("apply_lens", FALSE);
-
- dlg = gimp_dialog_new (_("Lens Effect"), "apply_lens",
- gimp_standard_help_func, "filters/apply_lens.html",
- GTK_WIN_POS_MOUSE,
- FALSE, TRUE, FALSE,
-
- _("OK"), lens_ok_callback,
- NULL, NULL, NULL, TRUE, FALSE,
- _("Cancel"), gtk_widget_destroy,
- NULL, 1, NULL, FALSE, TRUE,
-
- NULL);
-
- gtk_signal_connect (GTK_OBJECT (dlg), "destroy",
- GTK_SIGNAL_FUNC (gtk_main_quit),
- NULL);
-
- frame = gtk_frame_new (_("Parameter Settings"));
- gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
- gtk_container_set_border_width (GTK_CONTAINER (frame), 6);
- gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), frame, TRUE, TRUE, 0);
-
- vbox = gtk_vbox_new (FALSE, 2);
- gtk_container_set_border_width (GTK_CONTAINER (vbox), 4);
- gtk_container_add (GTK_CONTAINER (frame), vbox);
-
- toggle = gtk_radio_button_new_with_label (group,
- _("Keep Original Surroundings"));
- group = gtk_radio_button_group (GTK_RADIO_BUTTON (toggle));
- gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
- gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
- GTK_SIGNAL_FUNC (gimp_toggle_button_update),
- &lvals.keep_surr);
- gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), lvals.keep_surr);
- gtk_widget_show (toggle);
-
- toggle =
- gtk_radio_button_new_with_label (group,
- drawtype == GIMP_INDEXEDA_IMAGE ||
- drawtype == GIMP_INDEXED_IMAGE ?
- _("Set Surroundings to Index 0") :
- _("Set Surroundings to Background Color"));
- group = gtk_radio_button_group (GTK_RADIO_BUTTON (toggle));
- gtk_box_pack_start(GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
- gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
- GTK_SIGNAL_FUNC (gimp_toggle_button_update),
- &lvals.use_bkgr);
- gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), lvals.use_bkgr);
- gtk_widget_show (toggle);
-
- if ((drawtype == GIMP_INDEXEDA_IMAGE) ||
- (drawtype == GIMP_GRAYA_IMAGE) ||
- (drawtype == GIMP_RGBA_IMAGE))
- {
- toggle =
- gtk_radio_button_new_with_label (group,
- _("Make Surroundings Transparent"));
- group = gtk_radio_button_group (GTK_RADIO_BUTTON (toggle));
- gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
- gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
- GTK_SIGNAL_FUNC (gimp_toggle_button_update),
- &lvals.set_transparent);
- gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
- lvals.set_transparent);
- gtk_widget_show (toggle);
- }
-
- sep = gtk_hseparator_new ();
- gtk_box_pack_start (GTK_BOX (vbox), sep, FALSE, FALSE, 2);
- gtk_widget_show (sep);
-
- hbox = gtk_hbox_new (FALSE, 4);
- gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
-
- label = gtk_label_new (_("Lens Refraction Index:"));
- gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
- gtk_widget_show (label);
-
- spinbutton = gimp_spin_button_new (&adj, lvals.refraction,
- 1.0, 100.0, 0.1, 1.0, 0, 1, 2);
- gtk_box_pack_start (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0);
- gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
- GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
- &lvals.refraction);
- gtk_widget_show (spinbutton);
-
- gtk_widget_show (hbox);
- gtk_widget_show (vbox);
- gtk_widget_show (frame);
- gtk_widget_show (dlg);
-
- gtk_main ();
- gdk_flush ();
-
- return bint.run;
- }
-