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gimp/plug-ins/common/lens-apply.c

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/* GIMP - The GNU 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 3 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, see <http://www.gnu.org/licenses/>.
*/
/*
TO DO:
- antialiasing
- 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 <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_PROC "plug-in-applylens"
#define PLUG_IN_BINARY "lens-apply"
#define PLUG_IN_ROLE "gimp-lens-apply"
/* Declare local functions.
*/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void drawlens (GimpDrawable *drawable,
GimpPreview *preview);
static gboolean lens_dialog (GimpDrawable *drawable);
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
typedef struct
{
gdouble refraction;
gboolean keep_surr;
gboolean use_bkgr;
gboolean set_transparent;
} LensValues;
static LensValues lvals =
{
/* Lens refraction value */
1.7,
/* Surroundings options */
TRUE, FALSE, FALSE
};
MAIN ()
static void
query (void)
{
static const GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "run-mode", "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
{ 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 { TRUE, FALSE }" },
{ GIMP_PDB_INT32, "set-background", "Set lens surroundings to BG value { TRUE, FALSE }" },
{ GIMP_PDB_INT32, "set-transparent", "Set lens surroundings transparent { TRUE, FALSE }" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Simulate an elliptical lens over the image"),
"This plug-in uses Snell's law to draw "
"an ellipsoid lens over the image",
"Morten Eriksen",
"Morten Eriksen",
"1997",
N_("Apply _Lens..."),
"RGB*, GRAY*, INDEXED*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_PROC,
"<Image>/Filters/Distorts");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpDrawable *drawable;
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
INIT_I18N ();
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_PROC, &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_PROC, &lvals);
break;
default:
break;
}
gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));
gimp_progress_init (_("Applying lens"));
drawlens (drawable, NULL);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PLUG_IN_PROC, &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 a2,
gfloat b2,
gfloat c2,
gfloat x,
gfloat y,
gfloat *projx,
gfloat *projy)
{
gfloat z;
gfloat nxangle, nyangle, theta1, theta2;
gfloat ri1 = 1.0;
gfloat ri2 = lvals.refraction;
z = sqrt ((1 - x * x / a2 - y * y / b2) * c2);
nxangle = acos (x / sqrt(x * x + z * z));
theta1 = G_PI / 2 - nxangle;
theta2 = asin (sin (theta1) * ri1 / ri2);
theta2 = G_PI / 2 - nxangle - theta2;
*projx = x - tan (theta2) * z;
nyangle = acos (y / sqrt (y * y + z * z));
theta1 = G_PI / 2 - nyangle;
theta2 = asin (sin (theta1) * ri1 / ri2);
theta2 = G_PI / 2 - nyangle - theta2;
*projy = y - tan (theta2) * z;
}
static void
drawlens (GimpDrawable *drawable,
GimpPreview *preview)
{
GimpImageType drawtype = gimp_drawable_type (drawable->drawable_id);
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, c, asqr, bsqr, csqr, x, y;
glong pixelpos, pos;
GimpRGB background;
guchar bgr_red, bgr_blue, bgr_green;
guchar alphaval;
gimp_context_get_background (&background);
gimp_rgb_get_uchar (&background,
&bgr_red, &bgr_green, &bgr_blue);
bytes = drawable->bpp;
if (preview)
{
gimp_preview_get_position (preview, &x1, &y1);
gimp_preview_get_size (preview, &width, &height);
x2 = x1 + width;
y2 = y1 + height;
src = gimp_drawable_get_thumbnail_data (drawable->drawable_id,
&width, &height, &bytes);
regionwidth = width;
regionheight = height;
}
else
{
gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
regionwidth = x2 - x1;
regionheight = y2 - y1;
width = drawable->width;
height = drawable->height;
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_new (guchar, regionwidth * regionheight * bytes);
gimp_pixel_rgn_get_rect (&srcPR, src,
x1, y1, regionwidth, regionheight);
}
dest = g_new (guchar, regionwidth * regionheight * bytes);
a = regionwidth / 2;
b = regionheight / 2;
c = MIN (a, b);
asqr = a * a;
bsqr = b * b;
csqr = c * c;
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 (asqr, bsqr, csqr, 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 (!preview)
{
if (((gint) (regionwidth-col) % 5) == 0)
gimp_progress_update ((gdouble) col / (gdouble) regionwidth);
}
}
if (preview)
{
gimp_preview_draw_buffer (preview, dest, bytes * regionwidth);
}
else
{
gimp_progress_update (1.0);
gimp_pixel_rgn_set_rect (&destPR, dest, x1, y1,
regionwidth, regionheight);
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, x2 - x1, y2 - y1);
}
g_free (src);
g_free (dest);
}
static gboolean
lens_dialog (GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *label;
GtkWidget *toggle;
GtkWidget *hbox;
GtkWidget *vbox;
GtkWidget *spinbutton;
GtkObject *adj;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, FALSE);
dialog = gimp_dialog_new (_("Lens Effect"), PLUG_IN_ROLE,
NULL, 0,
gimp_standard_help_func, PLUG_IN_PROC,
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
gtk_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
gimp_window_set_transient (GTK_WINDOW (dialog));
main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
main_vbox, TRUE, TRUE, 0);
gtk_widget_show (main_vbox);
preview = gimp_aspect_preview_new (drawable, NULL);
gtk_box_pack_start (GTK_BOX (main_vbox), preview, TRUE, TRUE, 0);
gtk_widget_show (preview);
g_signal_connect_swapped (preview, "invalidated",
G_CALLBACK (drawlens),
drawable);
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);
gtk_box_pack_start (GTK_BOX (main_vbox), vbox, FALSE, FALSE, 0);
gtk_widget_show (vbox);
toggle = gtk_radio_button_new_with_mnemonic_from_widget
(NULL, _("_Keep original surroundings"));
gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), lvals.keep_surr);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&lvals.keep_surr);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
toggle = gtk_radio_button_new_with_mnemonic_from_widget
(GTK_RADIO_BUTTON (toggle),
gimp_drawable_is_indexed (drawable->drawable_id)
? _("_Set surroundings to index 0")
: _("_Set surroundings to background color"));
gtk_box_pack_start(GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), lvals.use_bkgr);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&lvals.use_bkgr);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
if (gimp_drawable_has_alpha (drawable->drawable_id))
{
toggle = gtk_radio_button_new_with_mnemonic_from_widget
(GTK_RADIO_BUTTON (toggle), _("_Make surroundings transparent"));
gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
lvals.set_transparent);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&lvals.set_transparent);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
}
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
gtk_box_pack_start (GTK_BOX (main_vbox), hbox, FALSE, FALSE, 0);
label = gtk_label_new_with_mnemonic (_("_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_widget_show (spinbutton);
gtk_label_set_mnemonic_widget (GTK_LABEL (label), spinbutton);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&lvals.refraction);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_widget_show (hbox);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
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