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gimp/plug-ins/pagecurl/pagecurl.c

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/* Page Curl 0.9 --- image filter plug-in for GIMP
* Copyright (C) 1996 Federico Mena Quintero
* Ported to Gimp 1.0 1998 by Simon Budig <Simon.Budig@unix-ag.org>
*
* You can contact me at quartic@polloux.fciencias.unam.mx
* You can contact the original GIMP authors at gimp@xcf.berkeley.edu
*
* 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/>.
*
*/
/*
* Ported to the 0.99.x architecture by Simon Budig, Simon.Budig@unix-ag.org
*/
/*
* Version History
* 0.5: (1996) Version for Gimp 0.54 by Federico Mena Quintero
* 0.6: (Feb '98) First Version for Gimp 0.99.x, very buggy.
* 0.8: (Mar '98) First "stable" version
* 0.9: (May '98)
* - Added support for Gradients. It is now possible to map
* a gradient to the back of the curl.
* - This implies a changed PDB-Interface: New "mode" parameter.
* - Pagecurl now returns the ID of the new layer.
* - Exchanged the meaning of FG/BG Color, because mostly the FG
* color is darker.
* 1.0: (July '04)
* - Code cleanup, added reverse gradient option.
*/
#include "config.h"
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#include "pagecurl-icons.h"
#define PLUG_IN_PROC "plug-in-pagecurl"
#define PLUG_IN_BINARY "pagecurl"
#define PLUG_IN_VERSION "July 2004, 1.0"
#define NGRADSAMPLES 256
typedef enum
{
CURL_COLORS_FG_BG,
CURL_COLORS_GRADIENT,
CURL_COLORS_GRADIENT_REVERSE,
CURL_COLORS_LAST = CURL_COLORS_GRADIENT_REVERSE
} CurlColors;
typedef enum
{
CURL_ORIENTATION_VERTICAL,
CURL_ORIENTATION_HORIZONTAL,
CURL_ORIENTATION_LAST = CURL_ORIENTATION_HORIZONTAL
} CurlOrientation;
typedef enum
{
CURL_EDGE_LOWER_RIGHT = 1,
CURL_EDGE_LOWER_LEFT = 2,
CURL_EDGE_UPPER_LEFT = 3,
CURL_EDGE_UPPER_RIGHT = 4,
CURL_EDGE_FIRST = CURL_EDGE_LOWER_RIGHT,
CURL_EDGE_LAST = CURL_EDGE_UPPER_RIGHT
} CurlEdge;
#define CURL_EDGE_LEFT(e) ((e) == CURL_EDGE_LOWER_LEFT || \
(e) == CURL_EDGE_UPPER_LEFT)
#define CURL_EDGE_RIGHT(e) ((e) == CURL_EDGE_LOWER_RIGHT || \
(e) == CURL_EDGE_UPPER_RIGHT)
#define CURL_EDGE_LOWER(e) ((e) == CURL_EDGE_LOWER_RIGHT || \
(e) == CURL_EDGE_LOWER_LEFT)
#define CURL_EDGE_UPPER(e) ((e) == CURL_EDGE_UPPER_LEFT || \
(e) == CURL_EDGE_UPPER_RIGHT)
/***** Types *****/
typedef struct
{
CurlColors colors;
gdouble opacity;
gboolean shade;
CurlEdge edge;
CurlOrientation orientation;
} CurlParams;
/***** Prototypes *****/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void set_default_params (void);
static void dialog_scale_update (GtkAdjustment *adjustment,
gdouble *value);
static gboolean dialog (void);
static void init_calculation (gint32 drawable_id);
static gint32 do_curl_effect (gint32 drawable_id);
static void clear_curled_region (gint32 drawable_id);
static gint32 page_curl (gint32 drawable_id);
static guchar * get_gradient_samples (gint32 drawable_id,
gboolean reverse);
/***** Variables *****/
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run /* run_proc */
};
static CurlParams curl;
/* Image parameters */
static gint32 image_id;
static GimpDrawable *curl_layer;
static const guint8 *curl_pixbufs[] =
{
curl0,
curl1,
curl2,
curl3,
curl4,
curl5,
curl6,
curl7
};
static GtkWidget *curl_image = NULL;
static gint sel_x1, sel_y1, sel_x2, sel_y2;
static gint true_sel_width, true_sel_height;
static gint sel_width, sel_height;
static gint drawable_position;
/* Center and radius of circle */
static GimpVector2 center;
static double radius;
/* Useful points to keep around */
static GimpVector2 left_tangent;
static GimpVector2 right_tangent;
/* Slopes --- these are *not* in the usual geometric sense! */
static gdouble diagl_slope;
static gdouble diagr_slope;
static gdouble diagb_slope;
static gdouble diagm_slope;
/* User-configured parameters */
static guchar fore_color[3];
static guchar back_color[3];
/***** Functions *****/
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" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
{ GIMP_PDB_INT32, "colors", "FG- and BG-Color (0), Current gradient (1), Current gradient reversed (2)" },
{ GIMP_PDB_INT32, "edge",
"Edge to curl (1-4, clockwise, starting in the lower right edge)" },
{ GIMP_PDB_INT32, "orientation", "Vertical (0), Horizontal (1)" },
{ GIMP_PDB_INT32, "shade",
"Shade the region under the curl (1) or not (0)" },
};
static const GimpParamDef return_vals[] =
{
{ GIMP_PDB_LAYER, "Curl Layer", "The new layer with the curl." }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Curl up one of the image corners"),
"This plug-in creates a pagecurl-effect.",
"Federico Mena Quintero and Simon Budig",
"Federico Mena Quintero and Simon Budig",
PLUG_IN_VERSION,
N_("_Pagecurl..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args),
G_N_ELEMENTS (return_vals),
args,
return_vals);
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[2];
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
gint32 drawable_id;
run_mode = param[0].data.d_int32;
INIT_I18N ();
set_default_params ();
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &curl);
*nreturn_vals = 2;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
values[1].type = GIMP_PDB_LAYER;
values[1].data.d_layer = -1;
/* Get the specified drawable */
drawable_id = param[2].data.d_drawable;
image_id = param[1].data.d_image;
if (gimp_drawable_is_rgb (drawable_id)
|| gimp_drawable_is_gray (drawable_id))
{
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* First acquire information with a dialog */
if (! dialog ())
return;
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 7)
status = GIMP_PDB_CALLING_ERROR;
if (status == GIMP_PDB_SUCCESS)
{
curl.colors = CLAMP (param[3].data.d_int32,
0, CURL_COLORS_LAST);
curl.edge = CLAMP (param[4].data.d_int32,
CURL_EDGE_FIRST, CURL_EDGE_LAST);
curl.orientation = CLAMP (param[5].data.d_int32,
0, CURL_ORIENTATION_LAST);
curl.shade = param[6].data.d_int32 ? TRUE : FALSE;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
break;
default:
break;
}
if (status == GIMP_PDB_SUCCESS)
{
values[1].data.d_layer = page_curl (drawable_id);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PLUG_IN_PROC, &curl, sizeof (CurlParams));
}
}
else
/* Sorry - no indexed/noalpha images */
status = GIMP_PDB_EXECUTION_ERROR;
values[0].data.d_status = status;
}
/*****************************************************
* Functions to locate the current point in the curl.
* The following functions assume an curl in the
* lower right corner.
* diagb crosses the two tangential points from the
* circle with diagl and diagr.
*
* +------------------------------------------------+
* | __-- /|
* | __-- _/ |
* | __-- / |
* | __-- _/ |
* | __-- / |
* | __--____ _/ |
* | __----~~ \ _/ |
* | __-- | _/ |
* | diagl __-- _/| _/diagr |
* | __-- diagm_/ |/ |
* | __-- /___/ |
* +-------------------------+----------------------+
*/
static inline gboolean
left_of_diagl (gdouble x,
gdouble y)
{
return (x < (sel_width + (y - sel_height) * diagl_slope));
}
static inline gboolean
right_of_diagr (gdouble x,
gdouble y)
{
return (x > (sel_width + (y - sel_height) * diagr_slope));
}
static inline gboolean
below_diagb (gdouble x,
gdouble y)
{
return (y < (right_tangent.y + (x - right_tangent.x) * diagb_slope));
}
static inline gboolean
right_of_diagm (gdouble x,
gdouble y)
{
return (x > (sel_width + (y - sel_height) * diagm_slope));
}
static inline gboolean
inside_circle (gdouble x,
gdouble y)
{
x -= center.x;
y -= center.y;
return x * x + y * y <= radius * radius;
}
static void
set_default_params (void)
{
curl.colors = CURL_COLORS_FG_BG;
curl.opacity = 1.0;
curl.shade = TRUE;
curl.edge = CURL_EDGE_LOWER_RIGHT;
curl.orientation = CURL_ORIENTATION_VERTICAL;
}
/********************************************************************/
/* dialog callbacks */
/********************************************************************/
static void
dialog_scale_update (GtkAdjustment *adjustment,
gdouble *value)
{
*value = ((gdouble) gtk_adjustment_get_value (adjustment)) / 100.0;
}
static void
curl_pixbuf_update (void)
{
GdkPixbuf *pixbuf;
gint index;
switch (curl.edge)
{
case CURL_EDGE_LOWER_RIGHT: index = 0; break;
case CURL_EDGE_LOWER_LEFT: index = 1; break;
case CURL_EDGE_UPPER_RIGHT: index = 2; break;
case CURL_EDGE_UPPER_LEFT: index = 3; break;
default:
return;
}
index += curl.orientation * 4;
pixbuf = gdk_pixbuf_new_from_inline (-1, curl_pixbufs[index], FALSE, NULL);
gtk_image_set_from_pixbuf (GTK_IMAGE (curl_image), pixbuf);
g_object_unref (pixbuf);
}
static gboolean
dialog (void)
{
/* Missing options: Color-dialogs? / own curl layer ? / transparency
to original drawable / Warp-curl (unsupported yet) */
GtkWidget *dialog;
GtkWidget *hbox;
GtkWidget *vbox;
GtkWidget *table;
GtkWidget *frame;
GtkWidget *button;
GtkWidget *combo;
GtkObject *adjustment;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, FALSE);
dialog = gimp_dialog_new (_("Pagecurl Effect"), PLUG_IN_BINARY,
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));
vbox = gtk_vbox_new (FALSE, 12);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 12);
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
vbox, TRUE, TRUE, 0);
gtk_widget_show (vbox);
frame = gimp_frame_new (_("Curl Location"));
gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
table = gtk_table_new (3, 2, TRUE);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_table_set_row_spacings (GTK_TABLE (table), 6);
gtk_container_add (GTK_CONTAINER (frame), table);
curl_image = gtk_image_new ();
gtk_table_attach (GTK_TABLE (table), curl_image, 0, 2, 1, 2,
GTK_SHRINK, GTK_SHRINK, 0, 0);
gtk_widget_show (curl_image);
curl_pixbuf_update ();
{
static const gchar *name[] =
{
N_("Lower right"),
N_("Lower left"),
N_("Upper left"),
N_("Upper right")
};
gint i;
button = NULL;
for (i = CURL_EDGE_FIRST; i <= CURL_EDGE_LAST; i++)
{
button =
gtk_radio_button_new_with_label (button == NULL ?
NULL :
gtk_radio_button_get_group (GTK_RADIO_BUTTON (button)),
gettext (name[i - CURL_EDGE_FIRST]));
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button),
curl.edge == i);
g_object_set_data (G_OBJECT (button),
"gimp-item-data", GINT_TO_POINTER (i));
gtk_table_attach (GTK_TABLE (table), button,
CURL_EDGE_LEFT (i) ? 0 : 1,
CURL_EDGE_LEFT (i) ? 1 : 2,
CURL_EDGE_UPPER (i) ? 0 : 2,
CURL_EDGE_UPPER (i) ? 1 : 3,
GTK_FILL | GTK_EXPAND, GTK_SHRINK, 0, 0);
gtk_widget_show (button);
g_signal_connect (button, "toggled",
G_CALLBACK (gimp_radio_button_update),
&curl.edge);
g_signal_connect (button, "toggled",
G_CALLBACK (curl_pixbuf_update),
NULL);
}
}
gtk_widget_show (table);
gtk_widget_show (frame);
frame = gimp_frame_new (_("Curl Orientation"));
gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
hbox = gtk_hbox_new (TRUE, 6);
gtk_container_add (GTK_CONTAINER (frame), hbox);
{
static const gchar *name[] =
{
N_("_Vertical"),
N_("_Horizontal")
};
gint i;
button = NULL;
for (i = 0; i <= CURL_ORIENTATION_LAST; i++)
{
button = gtk_radio_button_new_with_mnemonic (button == NULL ?
NULL :
gtk_radio_button_get_group (GTK_RADIO_BUTTON (button)),
gettext (name[i]));
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button),
curl.orientation == i);
g_object_set_data (G_OBJECT (button),
"gimp-item-data", GINT_TO_POINTER (i));
gtk_box_pack_end (GTK_BOX (hbox), button, TRUE, TRUE, 0);
gtk_widget_show (button);
g_signal_connect (button, "toggled",
G_CALLBACK (gimp_radio_button_update),
&curl.orientation);
g_signal_connect (button, "toggled",
G_CALLBACK (curl_pixbuf_update),
NULL);
}
}
gtk_widget_show (hbox);
gtk_widget_show (frame);
button = gtk_check_button_new_with_mnemonic (_("_Shade under curl"));
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button), curl.shade);
gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
gtk_widget_show (button);
g_signal_connect (button, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&curl.shade);
combo = g_object_new (GIMP_TYPE_INT_COMBO_BOX, NULL);
gimp_int_combo_box_prepend (GIMP_INT_COMBO_BOX (combo),
GIMP_INT_STORE_VALUE, CURL_COLORS_GRADIENT_REVERSE,
GIMP_INT_STORE_LABEL, _("Current gradient (reversed)"),
GIMP_INT_STORE_STOCK_ID, GIMP_STOCK_GRADIENT,
-1);
gimp_int_combo_box_prepend (GIMP_INT_COMBO_BOX (combo),
GIMP_INT_STORE_VALUE, CURL_COLORS_GRADIENT,
GIMP_INT_STORE_LABEL, _("Current gradient"),
GIMP_INT_STORE_STOCK_ID, GIMP_STOCK_GRADIENT,
-1);
gimp_int_combo_box_prepend (GIMP_INT_COMBO_BOX (combo),
GIMP_INT_STORE_VALUE, CURL_COLORS_FG_BG,
GIMP_INT_STORE_LABEL, _("Foreground / background colors"),
GIMP_INT_STORE_STOCK_ID, GIMP_STOCK_DEFAULT_COLORS,
-1);
gtk_box_pack_start (GTK_BOX (vbox), combo, FALSE, FALSE, 0);
gtk_widget_show (combo);
gimp_int_combo_box_connect (GIMP_INT_COMBO_BOX (combo),
curl.colors,
G_CALLBACK (gimp_int_combo_box_get_active),
&curl.colors);
gtk_widget_show (dialog);
table = gtk_table_new (1, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_box_pack_start (GTK_BOX (vbox), table, FALSE, FALSE, 0);
gtk_widget_show (table);
adjustment = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("_Opacity:"), 100, 0,
curl.opacity * 100.0, 0.0, 100.0,
1.0, 1.0, 0.0,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adjustment, "value-changed",
G_CALLBACK (dialog_scale_update),
&curl.opacity);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
static void
init_calculation (gint32 drawable_id)
{
gdouble k;
gdouble alpha, beta;
gdouble angle;
GimpVector2 v1, v2;
gint32 *image_layers;
gint32 nlayers;
GimpRGB color;
gimp_layer_add_alpha (drawable_id);
/* Image parameters */
/* Determine Position of original Layer in the Layer stack. */
image_layers = gimp_image_get_layers (image_id, &nlayers);
drawable_position = 0;
while (drawable_position < nlayers &&
image_layers[drawable_position] != drawable_id)
drawable_position++;
/* Get the bounds of the active selection */
gimp_drawable_mask_bounds (drawable_id,
&sel_x1, &sel_y1, &sel_x2, &sel_y2);
true_sel_width = sel_x2 - sel_x1;
true_sel_height = sel_y2 - sel_y1;
switch (curl.orientation)
{
case CURL_ORIENTATION_VERTICAL:
sel_width = true_sel_width;
sel_height = true_sel_height;
break;
case CURL_ORIENTATION_HORIZONTAL:
sel_width = true_sel_height;
sel_height = true_sel_width;
break;
}
/* Circle parameters */
alpha = atan ((double) sel_height / sel_width);
beta = alpha / 2.0;
k = sel_width / ((G_PI + alpha) * sin (beta) + cos (beta));
gimp_vector2_set (&center, k * cos (beta), k * sin (beta));
radius = center.y;
/* left_tangent */
gimp_vector2_set (&left_tangent, radius * -sin (alpha), radius * cos (alpha));
gimp_vector2_add (&left_tangent, &left_tangent, &center);
/* right_tangent */
gimp_vector2_sub (&v1, &left_tangent, &center);
gimp_vector2_set (&v2, sel_width - center.x, sel_height - center.y);
angle = -2.0 * acos (gimp_vector2_inner_product (&v1, &v2) /
(gimp_vector2_length (&v1) *
gimp_vector2_length (&v2)));
gimp_vector2_set (&right_tangent,
v1.x * cos (angle) + v1.y * -sin (angle),
v1.x * sin (angle) + v1.y * cos (angle));
gimp_vector2_add (&right_tangent, &right_tangent, &center);
/* Slopes */
diagl_slope = (double) sel_width / sel_height;
diagr_slope = (sel_width - right_tangent.x) / (sel_height - right_tangent.y);
diagb_slope = ((right_tangent.y - left_tangent.y) /
(right_tangent.x - left_tangent.x));
diagm_slope = (sel_width - center.x) / sel_height;
/* Colors */
gimp_context_get_foreground (&color);
gimp_rgb_get_uchar (&color, &fore_color[0], &fore_color[1], &fore_color[2]);
gimp_context_get_background (&color);
gimp_rgb_get_uchar (&color, &back_color[0], &back_color[1], &back_color[2]);
}
static gint32
do_curl_effect (gint32 drawable_id)
{
gint x = 0;
gint y = 0;
gboolean color_image;
gint x1, y1, k;
guint alpha_pos, progress, max_progress;
gdouble intensity, alpha, beta;
GimpVector2 v, dl, dr;
gdouble dl_mag, dr_mag, angle, factor;
guchar *pp, *dest, fore_grayval, back_grayval;
guchar *gradsamp;
GimpPixelRgn dest_rgn;
gpointer pr;
gint32 curl_layer_id;
guchar *grad_samples = NULL;
color_image = gimp_drawable_is_rgb (drawable_id);
curl_layer =
gimp_drawable_get (gimp_layer_new (image_id,
_("Curl Layer"),
true_sel_width,
true_sel_height,
color_image ?
GIMP_RGBA_IMAGE : GIMP_GRAYA_IMAGE,
100, GIMP_NORMAL_MODE));
curl_layer_id = curl_layer->drawable_id;
gimp_image_add_layer (image_id, curl_layer->drawable_id, drawable_position);
gimp_drawable_fill (curl_layer->drawable_id, GIMP_TRANSPARENT_FILL);
gimp_drawable_offsets (drawable_id, &x1, &y1);
gimp_layer_set_offsets (curl_layer->drawable_id, sel_x1 + x1, sel_y1 + y1);
gimp_tile_cache_ntiles (2 * (curl_layer->width / gimp_tile_width () + 1));
gimp_pixel_rgn_init (&dest_rgn, curl_layer,
0, 0, true_sel_width, true_sel_height, TRUE, TRUE);
/* Init shade_under */
gimp_vector2_set (&dl, -sel_width, -sel_height);
dl_mag = gimp_vector2_length (&dl);
gimp_vector2_set (&dr,
-(sel_width - right_tangent.x),
-(sel_height - right_tangent.y));
dr_mag = gimp_vector2_length (&dr);
alpha = acos (gimp_vector2_inner_product (&dl, &dr) / (dl_mag * dr_mag));
beta = alpha / 2;
/* Init shade_curl */
fore_grayval = GIMP_RGB_LUMINANCE (fore_color[0],
fore_color[1],
fore_color[2]) + 0.5;
back_grayval = GIMP_RGB_LUMINANCE (back_color[0],
back_color[1],
back_color[2]) + 0.5;
/* Gradient Samples */
switch (curl.colors)
{
case CURL_COLORS_FG_BG:
break;
case CURL_COLORS_GRADIENT:
grad_samples = get_gradient_samples (curl_layer->drawable_id, FALSE);
break;
case CURL_COLORS_GRADIENT_REVERSE:
grad_samples = get_gradient_samples (curl_layer->drawable_id, TRUE);
break;
}
max_progress = 2 * sel_width * sel_height;
progress = 0;
alpha_pos = dest_rgn.bpp - 1;
/* Main loop */
for (pr = gimp_pixel_rgns_register (1, &dest_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
dest = dest_rgn.data;
for (y1 = dest_rgn.y; y1 < dest_rgn.y + dest_rgn.h; y1++)
{
pp = dest;
for (x1 = dest_rgn.x; x1 < dest_rgn.x + dest_rgn.w; x1++)
{
/* Map coordinates to get the curl correct... */
switch (curl.orientation)
{
case CURL_ORIENTATION_VERTICAL:
x = CURL_EDGE_RIGHT (curl.edge) ? x1 : sel_width - 1 - x1;
y = CURL_EDGE_UPPER (curl.edge) ? y1 : sel_height - 1 - y1;
break;
case CURL_ORIENTATION_HORIZONTAL:
x = CURL_EDGE_LOWER (curl.edge) ? y1 : sel_width - 1 - y1;
y = CURL_EDGE_LEFT (curl.edge) ? x1 : sel_height - 1 - x1;
break;
}
if (left_of_diagl (x, y))
{ /* uncurled region */
for (k = 0; k <= alpha_pos; k++)
pp[k] = 0;
}
else if (right_of_diagr (x, y) ||
(right_of_diagm (x, y) &&
below_diagb (x, y) &&
!inside_circle (x, y)))
{
/* curled region */
for (k = 0; k <= alpha_pos; k++)
pp[k] = 0;
}
else
{
v.x = -(sel_width - x);
v.y = -(sel_height - y);
angle = acos (gimp_vector2_inner_product (&v, &dl) /
(gimp_vector2_length (&v) * dl_mag));
if (inside_circle (x, y) || below_diagb (x, y))
{
/* Below the curl. */
factor = angle / alpha;
for (k = 0; k < alpha_pos; k++)
pp[k] = 0;
pp[alpha_pos] = (curl.shade ?
(guchar) ((float) 255 * (float) factor) :
0);
}
else
{
/* On the curl */
switch (curl.colors)
{
case CURL_COLORS_FG_BG:
intensity = pow (sin (G_PI * angle / alpha), 1.5);
if (color_image)
{
pp[0] = (intensity * back_color[0] +
(1.0 - intensity) * fore_color[0]);
pp[1] = (intensity * back_color[1] +
(1.0 - intensity) * fore_color[1]);
pp[2] = (intensity * back_color[2] +
(1.0 - intensity) * fore_color[2]);
}
else
pp[0] = (intensity * back_grayval +
(1 - intensity) * fore_grayval);
pp[alpha_pos] = (guchar) ((double) 255.99 *
(1.0 - intensity *
(1.0 - curl.opacity)));
break;
case CURL_COLORS_GRADIENT:
case CURL_COLORS_GRADIENT_REVERSE:
/* Calculate position in Gradient */
intensity =
(angle/alpha) + sin (G_PI*2 * angle/alpha) * 0.075;
/* Check boundaries */
intensity = CLAMP (intensity, 0.0, 1.0);
gradsamp = (grad_samples +
((guint) (intensity * NGRADSAMPLES)) *
dest_rgn.bpp);
if (color_image)
{
pp[0] = gradsamp[0];
pp[1] = gradsamp[1];
pp[2] = gradsamp[2];
}
else
pp[0] = gradsamp[0];
pp[alpha_pos] =
(guchar) ((double) gradsamp[alpha_pos] *
(1.0 - intensity * (1.0 - curl.opacity)));
break;
}
}
}
pp += dest_rgn.bpp;
}
dest += dest_rgn.rowstride;
}
progress += dest_rgn.w * dest_rgn.h;
gimp_progress_update ((double) progress / (double) max_progress);
}
gimp_drawable_flush (curl_layer);
gimp_drawable_merge_shadow (curl_layer->drawable_id, FALSE);
gimp_drawable_update (curl_layer->drawable_id,
0, 0, curl_layer->width, curl_layer->height);
gimp_drawable_detach (curl_layer);
g_free (grad_samples);
return curl_layer_id;
}
/************************************************/
static void
clear_curled_region (gint32 drawable_id)
{
GimpPixelRgn src_rgn, dest_rgn;
gpointer pr;
gint x = 0;
gint y = 0;
guint x1, y1, i;
guchar *dest, *src, *pp, *sp;
guint alpha_pos, progress, max_progress;
GimpDrawable *drawable;
max_progress = 2 * sel_width * sel_height;
progress = max_progress / 2;
drawable = gimp_drawable_get (drawable_id);
gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));
gimp_pixel_rgn_init (&src_rgn, drawable,
sel_x1, sel_y1, true_sel_width, true_sel_height,
FALSE, FALSE);
gimp_pixel_rgn_init (&dest_rgn, drawable,
sel_x1, sel_y1, true_sel_width, true_sel_height,
TRUE, TRUE);
alpha_pos = dest_rgn.bpp - 1;
for (pr = gimp_pixel_rgns_register (2, &dest_rgn, &src_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
dest = dest_rgn.data;
src = src_rgn.data;
for (y1 = dest_rgn.y; y1 < dest_rgn.y + dest_rgn.h; y1++)
{
sp = src;
pp = dest;
for (x1 = dest_rgn.x; x1 < dest_rgn.x + dest_rgn.w; x1++)
{
/* Map coordinates to get the curl correct... */
switch (curl.orientation)
{
case CURL_ORIENTATION_VERTICAL:
x = (CURL_EDGE_RIGHT (curl.edge) ?
x1 - sel_x1 : sel_width - 1 - (x1 - sel_x1));
y = (CURL_EDGE_UPPER (curl.edge) ?
y1 - sel_y1 : sel_height - 1 - (y1 - sel_y1));
break;
case CURL_ORIENTATION_HORIZONTAL:
x = (CURL_EDGE_LOWER (curl.edge) ?
y1 - sel_y1 : sel_width - 1 - (y1 - sel_y1));
y = (CURL_EDGE_LEFT (curl.edge) ?
x1 - sel_x1 : sel_height - 1 - (x1 - sel_x1));
break;
}
for (i = 0; i < alpha_pos; i++)
pp[i] = sp[i];
if (right_of_diagr (x, y) ||
(right_of_diagm (x, y) &&
below_diagb (x, y) &&
!inside_circle (x, y)))
{
/* Right of the curl */
pp[alpha_pos] = 0;
}
else
{
pp[alpha_pos] = sp[alpha_pos];
}
pp += dest_rgn.bpp;
sp += src_rgn.bpp;
}
src += src_rgn.rowstride;
dest += dest_rgn.rowstride;
}
progress += dest_rgn.w * dest_rgn.h;
gimp_progress_update ((double) progress / (double) max_progress);
}
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable_id, TRUE);
gimp_drawable_update (drawable_id,
sel_x1, sel_y1, true_sel_width, true_sel_height);
gimp_drawable_detach (drawable);
}
static gint32
page_curl (gint32 drawable_id)
{
gint curl_layer_id;
gimp_image_undo_group_start (image_id);
gimp_progress_init (_("Page Curl"));
init_calculation (drawable_id);
curl_layer_id = do_curl_effect (drawable_id);
clear_curled_region (drawable_id);
gimp_image_undo_group_end (image_id);
return curl_layer_id;
}
/*
Returns NGRADSAMPLES samples of active gradient.
Each sample has (gimp_drawable_bpp (drawable_id)) bytes.
"ripped" from gradmap.c.
*/
static guchar *
get_gradient_samples (gint32 drawable_id,
gboolean reverse)
{
gchar *gradient_name;
gint n_f_samples;
gdouble *f_samples, *f_samp; /* float samples */
guchar *b_samples, *b_samp; /* byte samples */
gint bpp, color, has_alpha, alpha;
gint i, j;
gradient_name = gimp_context_get_gradient ();
gimp_gradient_get_uniform_samples (gradient_name, NGRADSAMPLES, reverse,
&n_f_samples, &f_samples);
g_free (gradient_name);
bpp = gimp_drawable_bpp (drawable_id);
color = gimp_drawable_is_rgb (drawable_id);
has_alpha = gimp_drawable_has_alpha (drawable_id);
alpha = (has_alpha ? bpp - 1 : bpp);
b_samples = g_new (guchar, NGRADSAMPLES * bpp);
for (i = 0; i < NGRADSAMPLES; i++)
{
b_samp = &b_samples[i * bpp];
f_samp = &f_samples[i * 4];
if (color)
for (j = 0; j < 3; j++)
b_samp[j] = f_samp[j] * 255;
else
b_samp[0] = GIMP_RGB_LUMINANCE (f_samp[0], f_samp[1], f_samp[2]) * 255;
if (has_alpha)
b_samp[alpha] = f_samp[3] * 255;
}
g_free (f_samples);
return b_samples;
}
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