/* This file is an image processing operation for GEGL
*
* GEGL is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* GEGL 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with GEGL; if not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2006 Øyvind Kolås <pippin@gimp.org>
*/
#include "config.h"
#include <glib/gi18n-lib.h>
#ifdef GEGL_CHANT_PROPERTIES
gegl_chant_color (fill, _("Fill Color"), "rgba(0.0,0.0,0.0,0.6)",
_("Color of paint to use for filling, use 0 opacity to disable filling"))
gegl_chant_color (stroke, _("Stroke Color"), "rgba(0.0,0.0,0.0,0.0)",
_("Color of paint to use for stroking"))
gegl_chant_double (stroke_width,_("Stroke width"), 0.0, 200.0, 2.0,
_("The width of the brush used to stroke the path"))
gegl_chant_double (stroke_opacity, _("Stroke opacity"), -2.0, 2.0, 1.0,
_("Opacity of stroke, note, does not behave like SVG since at the moment stroking is done using an airbrush tool"))
gegl_chant_double (stroke_hardness, _("Hardness"), 0.0, 1.0, 0.6,
_("Hardness of the brush, 0.0 for a soft brush, 1.0 for a hard brush"))
gegl_chant_string (fill_rule,_("Fill rule"), "nonzero",
_("How to determine what to fill (nonzero|evenodd"))
gegl_chant_string (transform,_("Transform"), "",
_("SVG style description of transform"))
gegl_chant_double (fill_opacity, _("Fill opacity"), -2.0, 2.0, 1.0,
_("The fill opacity to use"))
gegl_chant_path (d, _("Vector"),
_("A GeglVector representing the path of the stroke"))
#else
#define GEGL_CHANT_TYPE_FILTER
#define GEGL_CHANT_C_FILE "path.c"
#include "gegl-plugin.h"
#include "gegl-path.h"
static void path_changed (GeglPath *path,
const GeglRectangle *roi,
gpointer userdata);
#include "gegl-chant.h"
#include "gegl-buffer-private.h"
#include <cairo.h>
#include <math.h>
typedef struct StampStatic {
gboolean valid;
const Babl *format;
gfloat *buf;
gdouble radius;
}StampStatic;
static void gegl_path_stroke (GeglBuffer *buffer,
const GeglRectangle *clip_rect,
GeglPath *vector,
GeglColor *color,
gdouble linewidth,
gdouble hardness,
gdouble opacity);
static void gegl_path_stamp (GeglBuffer *buffer,
const GeglRectangle *clip_rect,
gdouble x,
gdouble y,
gdouble radius,
gdouble hardness,
GeglColor *color,
gdouble opacity);
static void
gegl_path_stroke (GeglBuffer *buffer,
const GeglRectangle *clip_rect,
GeglPath *vector,
GeglColor *color,
gdouble linewidth,
gdouble hardness,
gdouble opacity)
{
gfloat traveled_length = 0;
gfloat need_to_travel = 0;
gfloat x = 0,y = 0;
GeglPathList *iter;
gdouble xmin, xmax, ymin, ymax;
GeglRectangle extent;
if (!vector)
return;
if (!clip_rect)
{
g_print ("using buffer extent\n");
clip_rect = gegl_buffer_get_extent (buffer);
}
iter = gegl_path_get_flat_path (vector);
gegl_path_get_bounds (vector, &xmin, &xmax, &ymin, &ymax);
extent.x = floor (xmin);
extent.y = floor (ymin);
extent.width = ceil (xmax) - extent.x;
extent.height = ceil (ymax) - extent.y;
if (!gegl_rectangle_intersect (&extent, &extent, clip_rect))
{
return;
}
if (gegl_buffer_is_shared (buffer))
while (!gegl_buffer_try_lock (buffer));
/*gegl_buffer_clear (buffer, &extent);*/
while (iter)
{
/*fprintf (stderr, "%c, %i %i\n", iter->d.type, iter->d.point[0].x, iter->d.point[0].y);*/
switch (iter->d.type)
{
case 'M':
x = iter->d.point[0].x;
y = iter->d.point[0].y;
need_to_travel = 0;
traveled_length = 0;
break;
case 'L':
{
GeglPathPoint a,b;
gfloat spacing;
gfloat local_pos;
gfloat distance;
gfloat offset;
gfloat leftover;
gfloat radius = linewidth / 2.0;
a.x = x;
a.y = y;
b.x = iter->d.point[0].x;
b.y = iter->d.point[0].y;
spacing = 0.2 * radius;
distance = gegl_path_point_dist (&a, &b);
leftover = need_to_travel - traveled_length;
offset = spacing - leftover;
local_pos = offset;
if (distance > 0)
for (;
local_pos <= distance;
local_pos += spacing)
{
GeglPathPoint spot;
gfloat ratio = local_pos / distance;
gfloat radius = linewidth/2;
gegl_path_point_lerp (&spot, &a, &b, ratio);
gegl_path_stamp (buffer, clip_rect,
spot.x, spot.y, radius, hardness, color, opacity);
traveled_length += spacing;
}
need_to_travel += distance;
x = b.x;
y = b.y;
}
break;
case 'u':
g_error ("stroking uninitialized path\n");
break;
case 's':
break;
default:
g_error ("can't stroke for instruction: %i\n", iter->d.type);
break;
}
iter=iter->next;
}
if (gegl_buffer_is_shared (buffer))
gegl_buffer_unlock (buffer);
}
static void
gegl_path_stamp (GeglBuffer *buffer,
const GeglRectangle *clip_rect,
gdouble x,
gdouble y,
gdouble radius,
gdouble hardness,
GeglColor *color,
gdouble opacity)
{
gfloat col[4];
StampStatic s = {FALSE,}; /* there should be a cache of stamps,
note that stamps are accessed in multiple threads
*/
GeglRectangle temp;
GeglRectangle roi;
roi.x = floor(x-radius);
roi.y = floor(y-radius);
roi.width = ceil (x+radius) - floor (x-radius);
roi.height = ceil (y+radius) - floor (y-radius);
gegl_color_get_pixel (color, babl_format ("RGBA float"), col);
/* bail out if we wouldn't leave a mark on the buffer */
if (!gegl_rectangle_intersect (&temp, &roi, clip_rect))
{
return;
}
if (s.format == NULL)
s.format = babl_format ("RaGaBaA float");
if (s.buf == NULL ||
s.radius != radius)
{
if (s.buf != NULL)
g_free (s.buf);
/* allocate a little bit more, just in case due to rounding errors and
* such */
s.buf = g_malloc (4*4* (roi.width + 2 ) * (roi.height + 2));
s.radius = radius;
s.valid = TRUE;
}
g_assert (s.buf);
gegl_buffer_get_unlocked (buffer, 1.0, &roi, s.format, s.buf, 0);
{
gint u, v;
gint i=0;
gfloat radius_squared = radius * radius;
gfloat inner_radius_squared = (radius * hardness)*(radius * hardness);
gfloat soft_range = radius_squared - inner_radius_squared;
for (v= roi.y; v < roi.y + roi.height ; v++)
{
gfloat vy2 = (v-y)*(v-y);
for (u= roi.x; u < roi.x + roi.width; u++)
{
gfloat o = (u-x) * (u-x) + vy2;
if (o < inner_radius_squared)
o = col[3];
else if (o < radius_squared)
{
o = (1.0 - (o-inner_radius_squared) / (soft_range)) * col[3];
}
else
{
o=0.0;
}
if (o!=0.0)
{
gint c;
o = o*opacity;
for (c=0;c<4;c++)
s.buf[i*4+c] = (s.buf[i*4+c] * (1.0-o) + col[c] * o);
}
i++;
}
}
}
gegl_buffer_set_unlocked (buffer, &roi, s.format, s.buf, 0);
g_free (s.buf);
}
static void path_changed (GeglPath *path,
const GeglRectangle *roi,
gpointer userdata)
{
GeglRectangle rect = *roi;
GeglChantO *o = GEGL_CHANT_PROPERTIES (userdata);
/* invalidate the incoming rectangle */
rect.x -= o->stroke_width/2;
rect.y -= o->stroke_width/2;
rect.width += o->stroke_width;
rect.height += o->stroke_width;
gegl_operation_invalidate (userdata, &rect, FALSE);
};
static void
prepare (GeglOperation *operation)
{
GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
gegl_operation_set_format (operation, "output", babl_format ("RaGaBaA float"));
if (o->transform && o->transform[0] != '\0')
{
GeglMatrix3 matrix;
gegl_matrix3_parse_string (&matrix, o->transform);
gegl_path_set_matrix (o->d, &matrix);
}
}
static GeglRectangle
get_bounding_box (GeglOperation *operation)
{
GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
GeglRectangle defined = { 0, 0, 512, 512 };
GeglRectangle *in_rect;
gdouble x0, x1, y0, y1;
in_rect = gegl_operation_source_get_bounding_box (operation, "input");
gegl_path_get_bounds (o->d, &x0, &x1, &y0, &y1);
defined.x = x0 - o->stroke_width/2;
defined.y = y0 - o->stroke_width/2;
defined.width = x1 - x0 + o->stroke_width;
defined.height = y1 - y0 + o->stroke_width;
if (in_rect)
{
gegl_rectangle_bounding_box (&defined, &defined, in_rect);
}
return defined;
}
static void gegl_path_cairo_play (GeglPath *path,
cairo_t *cr);
static gboolean
process (GeglOperation *operation,
GeglBuffer *input,
GeglBuffer *output,
const GeglRectangle *result,
gint level)
{
GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
if (input)
{
gegl_buffer_copy (input, result, output, result);
}
else
{
gegl_buffer_clear (output, result);
}
if (o->fill_opacity > 0.0001 && o->fill)
{
gdouble r,g,b,a;
gegl_color_get_rgba (o->fill, &r,&g,&b,&a);
a *= o->fill_opacity;
if (a>0.001)
{
GStaticMutex mutex = G_STATIC_MUTEX_INIT;
cairo_t *cr;
cairo_surface_t *surface;
guchar *data;
g_static_mutex_lock (&mutex);
data = (void*)gegl_buffer_linear_open (output, result, NULL, babl_format ("B'aG'aR'aA u8"));
surface = cairo_image_surface_create_for_data (data,
CAIRO_FORMAT_ARGB32,
result->width,
result->height,
result->width * 4);
cr = cairo_create (surface);
cairo_translate (cr, -result->x, -result->y);
if (g_str_equal (o->fill_rule, "evenodd"))
{
cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
}
gegl_path_cairo_play (o->d, cr);
cairo_set_source_rgba (cr, r,g,b,a);
cairo_fill (cr);
g_static_mutex_unlock (&mutex);
gegl_buffer_linear_close (output, data);
}
}
g_object_set_data (G_OBJECT (operation), "path-radius", GINT_TO_POINTER((gint)(o->stroke_width+1)/2));
if (o->stroke_width > 0.1 && o->stroke_opacity > 0.0001)
{
gegl_path_stroke (output, result,
o->d,
o->stroke,
o->stroke_width,
o->stroke_hardness,
o->stroke_opacity);
}
return TRUE;
}
static void foreach_cairo (const GeglPathItem *knot,
gpointer cr)
{
switch (knot->type)
{
case 'M':
cairo_move_to (cr, knot->point[0].x, knot->point[0].y);
break;
case 'L':
cairo_line_to (cr, knot->point[0].x, knot->point[0].y);
break;
case 'C':
cairo_curve_to (cr, knot->point[0].x, knot->point[0].y,
knot->point[1].x, knot->point[1].y,
knot->point[2].x, knot->point[2].y);
break;
case 'z':
cairo_close_path (cr);
break;
default:
g_print ("%s uh?:%c\n", G_STRLOC, knot->type);
}
}
static void gegl_path_cairo_play (GeglPath *path,
cairo_t *cr)
{
gegl_path_foreach_flat (path, foreach_cairo, cr);
}
static GeglNode *detect (GeglOperation *operation,
gint x,
gint y)
{
GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
cairo_t *cr;
cairo_surface_t *surface;
gchar *data = " ";
gboolean result = FALSE;
surface = cairo_image_surface_create_for_data ((guchar*)data,
CAIRO_FORMAT_ARGB32,
1,1,4);
cr = cairo_create (surface);
gegl_path_cairo_play (o->d, cr);
cairo_set_line_width (cr, o->stroke_width);
if (o->stroke_width > 0.1 && o->stroke_opacity > 0.0001)
result = cairo_in_stroke (cr, x, y);
if (!result)
{
if (o->d)
{
gdouble r,g,b,a;
gegl_color_get_rgba (o->fill, &r,&g,&b,&a);
if (a * o->fill_opacity>0.8)
result = cairo_in_fill (cr, x, y);
}
}
cairo_destroy (cr);
if (result)
return operation->node;
return NULL;
}
static void
gegl_chant_class_init (GeglChantClass *klass)
{
GeglOperationClass *operation_class;
GeglOperationFilterClass *filter_class;
operation_class = GEGL_OPERATION_CLASS (klass);
filter_class = GEGL_OPERATION_FILTER_CLASS (klass);
filter_class->process = process;
operation_class->get_bounding_box = get_bounding_box;
operation_class->prepare = prepare;
operation_class->detect = detect;
/*operation_class->no_cache = TRUE;*/
gegl_operation_class_set_keys (operation_class,
"name" , "gegl:path",
"categories" , "render",
"description" , _("Renders a brush stroke"),
NULL);
}
#endif