gimp/app/core/gimpdrawable-stroke.c

396 lines
14 KiB
C

/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpdrawable-stroke.c
* Copyright (C) 2003 Simon Budig <simon@gimp.org>
*
* 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/>.
*/
#include "config.h"
#include <cairo.h>
#include <gegl.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpcolor/gimpcolor.h"
#include "core-types.h"
#include "gegl/gimp-gegl-apply-operation.h"
#include "gegl/gimp-gegl-utils.h"
#include "gimp.h"
#include "gimpbezierdesc.h"
#include "gimpboundary.h"
#include "gimpchannel.h"
#include "gimpcontext.h"
#include "gimpdrawable-stroke.h"
#include "gimperror.h"
#include "gimpimage.h"
#include "gimppattern.h"
#include "gimpscanconvert.h"
#include "gimpstrokeoptions.h"
#include "vectors/gimpstroke.h"
#include "vectors/gimpvectors.h"
#include "gimp-intl.h"
/* local function prototypes */
static GimpScanConvert * gimp_drawable_render_boundary (GimpDrawable *drawable,
const GimpBoundSeg *bound_segs,
gint n_bound_segs,
gint offset_x,
gint offset_y);
static GimpScanConvert * gimp_drawable_render_vectors (GimpDrawable *drawable,
GimpVectors *vectors,
gboolean do_stroke,
GError **error);
static void gimp_drawable_stroke_scan_convert (GimpDrawable *drawable,
GimpFillOptions *options,
GimpScanConvert *scan_convert,
gboolean do_stroke,
gboolean push_undo);
/* public functions */
void
gimp_drawable_fill_boundary (GimpDrawable *drawable,
GimpFillOptions *options,
const GimpBoundSeg *bound_segs,
gint n_bound_segs,
gint offset_x,
gint offset_y,
gboolean push_undo)
{
GimpScanConvert *scan_convert;
g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
g_return_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)));
g_return_if_fail (GIMP_IS_STROKE_OPTIONS (options));
g_return_if_fail (bound_segs == NULL || n_bound_segs != 0);
g_return_if_fail (gimp_fill_options_get_style (options) !=
GIMP_FILL_STYLE_PATTERN ||
gimp_context_get_pattern (GIMP_CONTEXT (options)) != NULL);
scan_convert = gimp_drawable_render_boundary (drawable,
bound_segs, n_bound_segs,
offset_x, offset_y);
if (scan_convert)
{
gimp_drawable_stroke_scan_convert (drawable, options,
scan_convert, FALSE, push_undo);
gimp_scan_convert_free (scan_convert);
}
}
void
gimp_drawable_stroke_boundary (GimpDrawable *drawable,
GimpStrokeOptions *options,
const GimpBoundSeg *bound_segs,
gint n_bound_segs,
gint offset_x,
gint offset_y,
gboolean push_undo)
{
GimpScanConvert *scan_convert;
g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
g_return_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)));
g_return_if_fail (GIMP_IS_STROKE_OPTIONS (options));
g_return_if_fail (bound_segs == NULL || n_bound_segs != 0);
g_return_if_fail (gimp_fill_options_get_style (GIMP_FILL_OPTIONS (options)) !=
GIMP_FILL_STYLE_PATTERN ||
gimp_context_get_pattern (GIMP_CONTEXT (options)) != NULL);
scan_convert = gimp_drawable_render_boundary (drawable,
bound_segs, n_bound_segs,
offset_x, offset_y);
if (scan_convert)
{
gimp_drawable_stroke_scan_convert (drawable, GIMP_FILL_OPTIONS (options),
scan_convert, TRUE, push_undo);
gimp_scan_convert_free (scan_convert);
}
}
gboolean
gimp_drawable_fill_vectors (GimpDrawable *drawable,
GimpFillOptions *options,
GimpVectors *vectors,
gboolean push_undo,
GError **error)
{
GimpScanConvert *scan_convert;
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), FALSE);
g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), FALSE);
g_return_val_if_fail (GIMP_IS_FILL_OPTIONS (options), FALSE);
g_return_val_if_fail (GIMP_IS_VECTORS (vectors), FALSE);
g_return_val_if_fail (gimp_fill_options_get_style (options) !=
GIMP_FILL_STYLE_PATTERN ||
gimp_context_get_pattern (GIMP_CONTEXT (options)) != NULL,
FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
scan_convert = gimp_drawable_render_vectors (drawable, vectors, FALSE, error);
if (scan_convert)
{
gimp_drawable_stroke_scan_convert (drawable, options,
scan_convert, FALSE, push_undo);
gimp_scan_convert_free (scan_convert);
return TRUE;
}
return FALSE;
}
gboolean
gimp_drawable_stroke_vectors (GimpDrawable *drawable,
GimpStrokeOptions *options,
GimpVectors *vectors,
gboolean push_undo,
GError **error)
{
GimpScanConvert *scan_convert;
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), FALSE);
g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), FALSE);
g_return_val_if_fail (GIMP_IS_STROKE_OPTIONS (options), FALSE);
g_return_val_if_fail (GIMP_IS_VECTORS (vectors), FALSE);
g_return_val_if_fail (gimp_fill_options_get_style (GIMP_FILL_OPTIONS (options)) !=
GIMP_FILL_STYLE_PATTERN ||
gimp_context_get_pattern (GIMP_CONTEXT (options)) != NULL,
FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
scan_convert = gimp_drawable_render_vectors (drawable, vectors, TRUE, error);
if (scan_convert)
{
gimp_drawable_stroke_scan_convert (drawable, GIMP_FILL_OPTIONS (options),
scan_convert, TRUE, push_undo);
gimp_scan_convert_free (scan_convert);
return TRUE;
}
return FALSE;
}
/* private functions */
static GimpScanConvert *
gimp_drawable_render_boundary (GimpDrawable *drawable,
const GimpBoundSeg *bound_segs,
gint n_bound_segs,
gint offset_x,
gint offset_y)
{
if (bound_segs)
{
GimpBoundSeg *stroke_segs;
gint n_stroke_segs;
stroke_segs = gimp_boundary_sort (bound_segs, n_bound_segs,
&n_stroke_segs);
if (stroke_segs)
{
GimpBezierDesc *bezier;
bezier = gimp_bezier_desc_new_from_bound_segs (stroke_segs,
n_bound_segs,
n_stroke_segs);
g_free (stroke_segs);
if (bezier)
{
GimpScanConvert *scan_convert;
scan_convert = gimp_scan_convert_new ();
gimp_bezier_desc_translate (bezier, offset_x, offset_y);
gimp_scan_convert_add_bezier (scan_convert, bezier);
gimp_bezier_desc_free (bezier);
return scan_convert;
}
}
}
return NULL;
}
static GimpScanConvert *
gimp_drawable_render_vectors (GimpDrawable *drawable,
GimpVectors *vectors,
gboolean do_stroke,
GError **error)
{
const GimpBezierDesc *bezier;
bezier = gimp_vectors_get_bezier (vectors);
if (bezier && (do_stroke ? bezier->num_data >= 2 : bezier->num_data > 4))
{
GimpScanConvert *scan_convert;
scan_convert = gimp_scan_convert_new ();
gimp_scan_convert_add_bezier (scan_convert, bezier);
return scan_convert;
}
g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
do_stroke ?
_("Not enough points to stroke") :
_("Not enough points to fill"));
return NULL;
}
static void
gimp_drawable_stroke_scan_convert (GimpDrawable *drawable,
GimpFillOptions *options,
GimpScanConvert *scan_convert,
gboolean do_stroke,
gboolean push_undo)
{
GimpContext *context = GIMP_CONTEXT (options);
GimpImage *image = gimp_item_get_image (GIMP_ITEM (drawable));
GeglBuffer *base_buffer;
GeglBuffer *mask_buffer;
gint x, y, w, h;
gint off_x;
gint off_y;
/* must call gimp_channel_is_empty() instead of relying on
* gimp_item_mask_intersect() because the selection pretends to
* be empty while it is being stroked, to prevent masking itself.
*/
if (gimp_channel_is_empty (gimp_image_get_mask (image)))
{
x = 0;
y = 0;
w = gimp_item_get_width (GIMP_ITEM (drawable));
h = gimp_item_get_height (GIMP_ITEM (drawable));
}
else if (! gimp_item_mask_intersect (GIMP_ITEM (drawable), &x, &y, &w, &h))
{
return;
}
if (do_stroke)
{
GimpStrokeOptions *stroke_options = GIMP_STROKE_OPTIONS (options);
gdouble width;
GimpUnit unit;
width = gimp_stroke_options_get_width (stroke_options);
unit = gimp_stroke_options_get_unit (stroke_options);
if (unit != GIMP_UNIT_PIXEL)
{
gdouble xres;
gdouble yres;
gimp_image_get_resolution (image, &xres, &yres);
gimp_scan_convert_set_pixel_ratio (scan_convert, yres / xres);
width = gimp_units_to_pixels (width, unit, yres);
}
gimp_scan_convert_stroke (scan_convert, width,
gimp_stroke_options_get_join_style (stroke_options),
gimp_stroke_options_get_cap_style (stroke_options),
gimp_stroke_options_get_miter_limit (stroke_options),
gimp_stroke_options_get_dash_offset (stroke_options),
gimp_stroke_options_get_dash_info (stroke_options));
}
/* fill a 1-bpp GeglBuffer with black, this will describe the shape
* of the stroke.
*/
mask_buffer = gegl_buffer_new (GEGL_RECTANGLE (0, 0, w, h),
babl_format ("Y u8"));
/* render the stroke into it */
gimp_item_get_offset (GIMP_ITEM (drawable), &off_x, &off_y);
gimp_scan_convert_render (scan_convert, mask_buffer,
x + off_x, y + off_y,
gimp_fill_options_get_antialias (options));
base_buffer = gegl_buffer_new (GEGL_RECTANGLE (0, 0, w, h),
gimp_drawable_get_format_with_alpha (drawable));
switch (gimp_fill_options_get_style (options))
{
case GIMP_FILL_STYLE_SOLID:
{
GimpRGB fg;
GeglColor *color;
gimp_context_get_foreground (context, &fg);
color = gimp_gegl_color_new (&fg);
gegl_buffer_set_color (base_buffer, NULL, color);
g_object_unref (color);
}
break;
case GIMP_FILL_STYLE_PATTERN:
{
GimpPattern *pattern = gimp_context_get_pattern (context);
GeglBuffer *pattern_buffer;
pattern_buffer = gimp_pattern_create_buffer (pattern);
gegl_buffer_set_pattern (base_buffer, NULL, pattern_buffer, 0, 0);
g_object_unref (pattern_buffer);
}
break;
}
gimp_gegl_apply_opacity (base_buffer, NULL, NULL, base_buffer,
mask_buffer, 0, 0, 1.0);
g_object_unref (mask_buffer);
/* Apply to drawable */
gimp_drawable_apply_buffer (drawable, base_buffer,
GEGL_RECTANGLE (0, 0, w, h),
push_undo, C_("undo-type", "Render Stroke"),
gimp_context_get_opacity (context),
gimp_context_get_paint_mode (context),
NULL, x, y);
g_object_unref (base_buffer);
gimp_drawable_update (drawable, x, y, w, h);
}