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PIKApp/plug-ins/pagecurl/pagecurl.c

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/* Page Curl 0.9 --- image filter plug-in for PIKA
* Copyright (C) 1996 Federico Mena Quintero
* Ported to Pika 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 PIKA authors at pika@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 <https://www.gnu.org/licenses/>.
*
*/
/*
* Ported to the 0.99.x architecture by Simon Budig, Simon.Budig@unix-ag.org
* Ported to the 3.0 plug-in API by Michael Natterer <mitch@gimp.org>
*/
/*
* Version History
* 0.5: (1996) Version for Pika 0.54 by Federico Mena Quintero
* 0.6: (Feb '98) First Version for Pika 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 <libpika/pika.h>
#include <libpika/pikaui.h>
#include "libpika/stdplugins-intl.h"
#define PLUG_IN_PROC "plug-in-pagecurl"
#define PLUG_IN_BINARY "pagecurl"
#define PLUG_IN_ROLE "pika-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;
typedef struct _Pagecurl Pagecurl;
typedef struct _PagecurlClass PagecurlClass;
struct _Pagecurl
{
PikaPlugIn parent_instance;
};
struct _PagecurlClass
{
PikaPlugInClass parent_class;
};
#define PAGECURL_TYPE (pagecurl_get_type ())
#define PAGECURL (obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), PAGECURL_TYPE, Pagecurl))
GType pagecurl_get_type (void) G_GNUC_CONST;
static GList * pagecurl_query_procedures (PikaPlugIn *plug_in);
static PikaProcedure * pagecurl_create_procedure (PikaPlugIn *plug_in,
const gchar *name);
static PikaValueArray * pagecurl_run (PikaProcedure *procedure,
PikaRunMode run_mode,
PikaImage *image,
gint n_drawables,
PikaDrawable **drawables,
const PikaValueArray *args,
gpointer run_data);
static void dialog_scale_update (PikaLabelSpin *spin,
gdouble *value);
static gboolean dialog (void);
static void init_calculation (PikaDrawable *drawable);
static PikaLayer * do_curl_effect (PikaDrawable *drawable);
static void clear_curled_region (PikaDrawable *drawable);
static PikaLayer * page_curl (PikaDrawable *drawable);
static PikaRGB * get_gradient_samples (PikaDrawable *drawable,
gboolean reverse);
G_DEFINE_TYPE (Pagecurl, pagecurl, PIKA_TYPE_PLUG_IN)
PIKA_MAIN (PAGECURL_TYPE)
DEFINE_STD_SET_I18N
/***** Variables *****/
static CurlParams curl;
/* Image parameters */
static PikaImage *image = NULL;
static GtkWidget *curl_image = NULL;
static gint sel_x, sel_y;
static gint true_sel_width, true_sel_height;
static gint sel_width, sel_height;
static gint drawable_position;
/* Center and radius of circle */
static PikaVector2 center;
static double radius;
/* Useful points to keep around */
static PikaVector2 left_tangent;
static PikaVector2 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 PikaRGB fg_color;
static PikaRGB bg_color;
static void
pagecurl_class_init (PagecurlClass *klass)
{
PikaPlugInClass *plug_in_class = PIKA_PLUG_IN_CLASS (klass);
plug_in_class->query_procedures = pagecurl_query_procedures;
plug_in_class->create_procedure = pagecurl_create_procedure;
plug_in_class->set_i18n = STD_SET_I18N;
}
static void
pagecurl_init (Pagecurl *pagecurl)
{
}
static GList *
pagecurl_query_procedures (PikaPlugIn *plug_in)
{
return g_list_append (NULL, g_strdup (PLUG_IN_PROC));
}
static PikaProcedure *
pagecurl_create_procedure (PikaPlugIn *plug_in,
const gchar *name)
{
PikaProcedure *procedure = NULL;
if (! strcmp (name, PLUG_IN_PROC))
{
procedure = pika_image_procedure_new (plug_in, name,
PIKA_PDB_PROC_TYPE_PLUGIN,
pagecurl_run, NULL, NULL);
pika_procedure_set_image_types (procedure, "RGB*, GRAY*");
pika_procedure_set_sensitivity_mask (procedure,
PIKA_PROCEDURE_SENSITIVE_DRAWABLE);
pika_procedure_set_menu_label (procedure, _("_Pagecurl..."));
pika_procedure_add_menu_path (procedure, "<Image>/Filters/Distorts");
pika_procedure_set_documentation (procedure,
_("Curl up one of the image corners"),
"This plug-in creates a pagecurl-effect.",
name);
pika_procedure_set_attribution (procedure,
"Federico Mena Quintero and Simon Budig",
"Federico Mena Quintero and Simon Budig",
PLUG_IN_VERSION);
PIKA_PROC_ARG_INT (procedure, "colors",
"Colors",
"FG- and BG-Color (0), Current gradient (1), "
"Current gradient reversed (2)",
CURL_COLORS_FG_BG, CURL_COLORS_LAST, CURL_COLORS_FG_BG,
G_PARAM_READWRITE);
PIKA_PROC_ARG_INT (procedure, "edge",
"Edge",
"Edge to curl (1-4, clockwise, starting in the "
"lower right edge)",
CURL_EDGE_LOWER_RIGHT, CURL_EDGE_UPPER_RIGHT,
CURL_EDGE_LOWER_RIGHT,
G_PARAM_READWRITE);
PIKA_PROC_ARG_INT (procedure, "orientation",
"Orientation",
"Vertical (0), Horizontal (1)",
CURL_ORIENTATION_VERTICAL, CURL_ORIENTATION_HORIZONTAL,
CURL_ORIENTATION_VERTICAL,
G_PARAM_READWRITE);
PIKA_PROC_ARG_BOOLEAN (procedure, "shade",
"Shade",
"Shade the region under the curl",
TRUE,
G_PARAM_READWRITE);
PIKA_PROC_VAL_LAYER (procedure, "curl-layer",
"Curl layer",
"The new layer with the curl.",
FALSE,
G_PARAM_READWRITE);
}
return procedure;
}
static PikaValueArray *
pagecurl_run (PikaProcedure *procedure,
PikaRunMode run_mode,
PikaImage *_image,
gint n_drawables,
PikaDrawable **drawables,
const PikaValueArray *args,
gpointer run_data)
{
PikaDrawable *drawable;
PikaValueArray *return_vals = NULL;
gegl_init (NULL, NULL);
image = _image;
if (n_drawables != 1)
{
GError *error = NULL;
g_set_error (&error, PIKA_PLUG_IN_ERROR, 0,
_("Procedure '%s' only works with one drawable."),
pika_procedure_get_name (procedure));
return pika_procedure_new_return_values (procedure,
PIKA_PDB_CALLING_ERROR,
error);
}
else
{
drawable = drawables[0];
}
curl.colors = PIKA_VALUES_GET_INT (args, 0);
curl.edge = PIKA_VALUES_GET_INT (args, 1);
curl.orientation = PIKA_VALUES_GET_INT (args, 2);
curl.shade = PIKA_VALUES_GET_BOOLEAN (args, 3);
if (! pika_drawable_mask_intersect (drawable, &sel_x, &sel_y,
&true_sel_width, &true_sel_height))
{
return pika_procedure_new_return_values (procedure, PIKA_PDB_SUCCESS,
NULL);
}
if (! (pika_drawable_is_rgb (drawable) ||
pika_drawable_is_gray (drawable)))
{
/* Sorry - no indexed/noalpha images */
return pika_procedure_new_return_values (procedure,
PIKA_PDB_EXECUTION_ERROR,
NULL);
}
switch (run_mode)
{
case PIKA_RUN_INTERACTIVE:
/* Possibly retrieve data */
pika_get_data (PLUG_IN_PROC, &curl);
/* First acquire information with a dialog */
if (! dialog ())
return pika_procedure_new_return_values (procedure,
PIKA_PDB_CANCEL,
NULL);
break;
case PIKA_RUN_NONINTERACTIVE:
break;
case PIKA_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
pika_get_data (PLUG_IN_PROC, &curl);
break;
default:
break;
}
return_vals = pika_procedure_new_return_values (procedure, PIKA_PDB_SUCCESS,
NULL);
PIKA_VALUES_SET_LAYER (return_vals, 1, page_curl (drawable));
if (run_mode != PIKA_RUN_NONINTERACTIVE)
pika_displays_flush ();
if (run_mode == PIKA_RUN_INTERACTIVE)
pika_set_data (PLUG_IN_PROC, &curl, sizeof (CurlParams));
return return_vals;
}
/*****************************************************
* 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;
}
/********************************************************************/
/* dialog callbacks */
/********************************************************************/
static void
dialog_scale_update (PikaLabelSpin *scale,
gdouble *value)
{
*value = ((gdouble) pika_label_spin_get_value (scale)) / 100.0;
}
static void
curl_pixbuf_update (void)
{
GdkPixbuf *pixbuf;
gint index;
gchar *resource;
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;
resource = g_strdup_printf ("/technology.heckin/pagecurl-icons/curl%c.png",
'0' + index);
pixbuf = gdk_pixbuf_new_from_resource (resource, NULL);
g_free (resource);
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 *grid;
GtkWidget *frame;
GtkWidget *button;
GtkWidget *combo;
GtkWidget *scale;
gboolean run;
pika_ui_init (PLUG_IN_BINARY);
dialog = pika_dialog_new (_("Pagecurl Effect"), PLUG_IN_ROLE,
NULL, 0,
pika_standard_help_func, PLUG_IN_PROC,
_("_Cancel"), GTK_RESPONSE_CANCEL,
_("_OK"), GTK_RESPONSE_OK,
NULL);
pika_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
pika_window_set_transient (GTK_WINDOW (dialog));
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 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 = pika_frame_new (_("Curl Location"));
gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
grid = gtk_grid_new ();
gtk_grid_set_row_spacing (GTK_GRID (grid), 6);
gtk_grid_set_column_spacing (GTK_GRID (grid), 6);
gtk_container_add (GTK_CONTAINER (frame), grid);
gtk_widget_show (grid);
curl_image = gtk_image_new ();
gtk_grid_attach (GTK_GRID (grid), curl_image, 0, 1, 2, 1);
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),
"pika-item-data", GINT_TO_POINTER (i));
gtk_grid_attach (GTK_GRID (grid), button,
CURL_EDGE_LEFT (i) ? 0 : 1,
CURL_EDGE_UPPER (i) ? 0 : 2,
1, 1);
// GTK_FILL | GTK_EXPAND, GTK_SHRINK, 0, 0);
gtk_widget_show (button);
g_signal_connect (button, "toggled",
G_CALLBACK (pika_radio_button_update),
&curl.edge);
g_signal_connect (button, "toggled",
G_CALLBACK (curl_pixbuf_update),
NULL);
}
}
frame = pika_frame_new (_("Curl Orientation"));
gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
gtk_box_set_homogeneous (GTK_BOX (hbox), TRUE);
gtk_container_add (GTK_CONTAINER (frame), hbox);
gtk_widget_show (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),
"pika-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 (pika_radio_button_update),
&curl.orientation);
g_signal_connect (button, "toggled",
G_CALLBACK (curl_pixbuf_update),
NULL);
}
}
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 (pika_toggle_button_update),
&curl.shade);
combo = g_object_new (PIKA_TYPE_INT_COMBO_BOX, NULL);
pika_int_combo_box_prepend (PIKA_INT_COMBO_BOX (combo),
PIKA_INT_STORE_VALUE, CURL_COLORS_GRADIENT_REVERSE,
PIKA_INT_STORE_LABEL, _("Current gradient (reversed)"),
PIKA_INT_STORE_ICON_NAME, PIKA_ICON_GRADIENT,
-1);
pika_int_combo_box_prepend (PIKA_INT_COMBO_BOX (combo),
PIKA_INT_STORE_VALUE, CURL_COLORS_GRADIENT,
PIKA_INT_STORE_LABEL, _("Current gradient"),
PIKA_INT_STORE_ICON_NAME, PIKA_ICON_GRADIENT,
-1);
pika_int_combo_box_prepend (PIKA_INT_COMBO_BOX (combo),
PIKA_INT_STORE_VALUE, CURL_COLORS_FG_BG,
PIKA_INT_STORE_LABEL, _("Foreground / background colors"),
PIKA_INT_STORE_ICON_NAME, PIKA_ICON_COLORS_DEFAULT,
-1);
gtk_box_pack_start (GTK_BOX (vbox), combo, FALSE, FALSE, 0);
gtk_widget_show (combo);
pika_int_combo_box_connect (PIKA_INT_COMBO_BOX (combo),
curl.colors,
G_CALLBACK (pika_int_combo_box_get_active),
&curl.colors, NULL);
scale = pika_scale_entry_new (_("_Opacity:"), curl.opacity * 100.0, 0.0, 100.0, 0.0);
g_signal_connect (scale, "value-changed",
G_CALLBACK (dialog_scale_update),
&curl.opacity);
gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 6);
gtk_widget_show (scale);
gtk_widget_show (dialog);
run = (pika_dialog_run (PIKA_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
static void
init_calculation (PikaDrawable *drawable)
{
gdouble k;
gdouble alpha, beta;
gdouble angle;
PikaVector2 v1, v2;
GList *layers;
pika_layer_add_alpha (PIKA_LAYER (drawable));
/* Image parameters */
/* Determine Position of original Layer in the Layer stack. */
layers = pika_image_list_layers (image);
drawable_position = g_list_index (layers, drawable);
g_list_free (layers);
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));
pika_vector2_set (&center, k * cos (beta), k * sin (beta));
radius = center.y;
/* left_tangent */
pika_vector2_set (&left_tangent, radius * -sin (alpha), radius * cos (alpha));
pika_vector2_add (&left_tangent, &left_tangent, &center);
/* right_tangent */
pika_vector2_sub (&v1, &left_tangent, &center);
pika_vector2_set (&v2, sel_width - center.x, sel_height - center.y);
angle = -2.0 * acos (pika_vector2_inner_product (&v1, &v2) /
(pika_vector2_length (&v1) *
pika_vector2_length (&v2)));
pika_vector2_set (&right_tangent,
v1.x * cos (angle) + v1.y * -sin (angle),
v1.x * sin (angle) + v1.y * cos (angle));
pika_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 */
pika_context_get_foreground (&fg_color);
pika_context_get_background (&bg_color);
}
static PikaLayer *
do_curl_effect (PikaDrawable *drawable)
{
gint x = 0;
gint y = 0;
gboolean color_image;
gint x1, y1;
guint progress, max_progress;
gdouble intensity, alpha;
PikaVector2 v, dl, dr;
gdouble dl_mag, dr_mag, angle, factor;
GeglBuffer *curl_buffer;
PikaLayer *curl_layer;
PikaRGB *grad_samples = NULL;
gint width, height, n_ch;
GeglRectangle *roi;
GeglBufferIterator *iter;
const Babl *format;
color_image = pika_drawable_is_rgb (drawable);
curl_layer = pika_layer_new (image,
_("Curl Layer"),
true_sel_width,
true_sel_height,
color_image ?
PIKA_RGBA_IMAGE : PIKA_GRAYA_IMAGE,
100,
pika_image_get_default_new_layer_mode (image));
pika_image_insert_layer (image, curl_layer,
PIKA_LAYER (pika_item_get_parent (PIKA_ITEM (drawable))),
drawable_position);
pika_drawable_fill (PIKA_DRAWABLE (curl_layer), PIKA_FILL_TRANSPARENT);
pika_drawable_get_offsets (drawable, &x1, &y1);
pika_layer_set_offsets (curl_layer, sel_x + x1, sel_y + y1);
curl_buffer = pika_drawable_get_shadow_buffer (PIKA_DRAWABLE (curl_layer));
width = gegl_buffer_get_width (curl_buffer);
height = gegl_buffer_get_height (curl_buffer);
format = babl_format ("R'G'B'A float");
n_ch = babl_format_get_n_components (format);
iter = gegl_buffer_iterator_new (curl_buffer,
GEGL_RECTANGLE (0, 0, width, height), 0,
format,
GEGL_ACCESS_WRITE, GEGL_ABYSS_NONE, 1);
/* Init shade_under */
pika_vector2_set (&dl, -sel_width, -sel_height);
dl_mag = pika_vector2_length (&dl);
pika_vector2_set (&dr,
-(sel_width - right_tangent.x),
-(sel_height - right_tangent.y));
dr_mag = pika_vector2_length (&dr);
alpha = acos (pika_vector2_inner_product (&dl, &dr) / (dl_mag * dr_mag));
/* Gradient Samples */
switch (curl.colors)
{
case CURL_COLORS_FG_BG:
break;
case CURL_COLORS_GRADIENT:
grad_samples = get_gradient_samples (PIKA_DRAWABLE (curl_layer), FALSE);
break;
case CURL_COLORS_GRADIENT_REVERSE:
grad_samples = get_gradient_samples (PIKA_DRAWABLE (curl_layer), TRUE);
break;
}
max_progress = 2 * sel_width * sel_height;
progress = 0;
/* Main loop */
while (gegl_buffer_iterator_next (iter))
{
gfloat *dest;
roi = &iter->items[0].roi;
dest = (gfloat *) iter->items[0].data;
for (y1 = roi->y; y1 < roi->y + roi->height; y1++)
{
PikaRGB color;
for (x1 = roi->x; x1 < roi->x + roi->width; 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: transparent black */
pika_rgba_set (&color, 0, 0, 0, 0);
}
else if (right_of_diagr (x, y) ||
(right_of_diagm (x, y) &&
below_diagb (x, y) &&
!inside_circle (x, y)))
{
/* curled region: transparent black */
pika_rgba_set (&color, 0, 0, 0, 0);
}
else
{
v.x = -(sel_width - x);
v.y = -(sel_height - y);
angle = acos (pika_vector2_inner_product (&v, &dl) /
(pika_vector2_length (&v) * dl_mag));
if (inside_circle (x, y) || below_diagb (x, y))
{
/* Below the curl. */
factor = angle / alpha;
pika_rgba_set (&color, 0, 0, 0, curl.shade ? factor : 0);
}
else
{
PikaRGB *gradrgb;
/* On the curl */
switch (curl.colors)
{
case CURL_COLORS_FG_BG:
intensity = pow (sin (G_PI * angle / alpha), 1.5);
pika_rgba_set (&color,
intensity * bg_color.r + (1.0 - intensity) * fg_color.r,
intensity * bg_color.g + (1.0 - intensity) * fg_color.g,
intensity * bg_color.b + (1.0 - intensity) * fg_color.b,
(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;
gradrgb = grad_samples + ((guint) (intensity * NGRADSAMPLES));
/* Check boundaries */
intensity = CLAMP (intensity, 0.0, 1.0);
color = *gradrgb;
color.a = gradrgb->a * (1.0 - intensity * (1.0 - curl.opacity));
break;
}
}
}
dest[0] = color.r;
dest[1] = color.g;
dest[2] = color.b;
dest[3] = color.a;
dest += n_ch;
}
}
progress += roi->width * roi->height;
pika_progress_update ((double) progress / (double) max_progress);
}
pika_progress_update (0.5);
gegl_buffer_flush (curl_buffer);
pika_drawable_merge_shadow (PIKA_DRAWABLE (curl_layer), FALSE);
pika_drawable_update (PIKA_DRAWABLE (curl_layer), 0, 0, width, height);
g_free (grad_samples);
return curl_layer;
}
/************************************************/
static void
clear_curled_region (PikaDrawable *drawable)
{
gint x = 0;
gint y = 0;
guint x1, y1;
gfloat *dest, *src;
guint progress, max_progress;
GeglBuffer *buf;
GeglBuffer *shadow_buf;
GeglRectangle *roi;
GeglBufferIterator *iter;
const Babl *format;
gint width, height, bpp, n_ch;
gint buf_index;
max_progress = 2 * sel_width * sel_height;
progress = max_progress / 2;
buf = pika_drawable_get_buffer (drawable);
shadow_buf = pika_drawable_get_shadow_buffer (drawable);
width = gegl_buffer_get_width (buf);
height = gegl_buffer_get_height (buf);
format = babl_format ("R'G'B'A float");
bpp = babl_format_get_bytes_per_pixel (format);
n_ch = babl_format_get_n_components (format);
iter = gegl_buffer_iterator_new (shadow_buf,
GEGL_RECTANGLE (0, 0, width, height), 0,
format,
GEGL_ACCESS_WRITE, GEGL_ABYSS_NONE, 2);
buf_index = gegl_buffer_iterator_add (iter, buf, NULL, 0,
format,
GEGL_ACCESS_READ, GEGL_ABYSS_NONE);
while (gegl_buffer_iterator_next (iter))
{
roi = &iter->items[0].roi;
dest = iter->items[0].data;
src = iter->items[buf_index].data;
memcpy (dest, src, roi->width * roi->height * bpp);
for (y1 = roi->y; y1 < roi->y + roi->height; y1++)
{
for (x1 = roi->x; x1 < roi->x + roi->width; x1++)
{
/* Map coordinates to get the curl correct... */
switch (curl.orientation)
{
case CURL_ORIENTATION_VERTICAL:
x = (CURL_EDGE_RIGHT (curl.edge) ?
x1 - sel_x : sel_width - 1 - (x1 - sel_x));
y = (CURL_EDGE_UPPER (curl.edge) ?
y1 - sel_y : sel_height - 1 - (y1 - sel_y));
break;
case CURL_ORIENTATION_HORIZONTAL:
x = (CURL_EDGE_LOWER (curl.edge) ?
y1 - sel_y : sel_width - 1 - (y1 - sel_y));
y = (CURL_EDGE_LEFT (curl.edge) ?
x1 - sel_x : sel_height - 1 - (x1 - sel_x));
break;
}
if (right_of_diagr (x, y) ||
(right_of_diagm (x, y) &&
below_diagb (x, y) &&
!inside_circle (x, y)))
{
/* Right of the curl: Alpha = 0 */
dest[0] = src[0];
dest[1] = src[1];
dest[2] = src[2];
dest[3] = 0.0;
}
dest += n_ch;
src += n_ch;
}
}
progress += roi->width * roi->height;
pika_progress_update ((double) progress / (double) max_progress);
}
pika_progress_update (1.0);
gegl_buffer_flush (shadow_buf);
pika_drawable_merge_shadow (drawable, TRUE);
pika_drawable_update (drawable,
sel_x, sel_y,
true_sel_width, true_sel_height);
}
static PikaLayer *
page_curl (PikaDrawable *drawable)
{
PikaLayer *curl_layer;
pika_image_undo_group_start (image);
pika_progress_init (_("Page Curl"));
init_calculation (drawable);
curl_layer = do_curl_effect (drawable);
clear_curled_region (drawable);
pika_image_undo_group_end (image);
return curl_layer;
}
/*
Returns NGRADSAMPLES samples of active gradient.
Each sample has (pika_drawable_get_bpp (drawable)) bytes.
"ripped" from gradmap.c.
*/
static PikaRGB *
get_gradient_samples (PikaDrawable *drawable,
gboolean reverse)
{
PikaGradient *gradient;
gint n_d_samples;
gdouble *d_samples = NULL;
PikaRGB *rgba;
gint i;
gradient = pika_context_get_gradient ();
pika_gradient_get_uniform_samples (gradient, NGRADSAMPLES, reverse,
&n_d_samples, &d_samples);
rgba = g_new0 (PikaRGB, NGRADSAMPLES);
for (i = 0; i < NGRADSAMPLES; i++)
{
pika_rgba_set (rgba + i,
d_samples[i*4 + 0],
d_samples[i*4 + 1],
d_samples[i*4 + 2],
d_samples[i*4 + 3]);
}
return rgba;
}
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