src/display/canvas-bpath.cpp

   1 /*
   2  * Simple bezier bpath CanvasItem for inkscape
   3  *
   4  * Authors:
   5  *   Lauris Kaplinski <lauris@ximian.com>
   6  *
   7  * Copyright (C) 2001 Lauris Kaplinski and Ximian, Inc.
   8  *
   9  * Released under GNU GPL
  10  *
  11  */
  12
  13 #ifdef HAVE_CONFIG_H
  14 # include "config.h"
  15 #endif
  16 #include <sstream>
  17 #include <string.h>
  18 #include <desktop.h>
  19
  20 #include "color.h"
  21 #include "sp-canvas-util.h"
  22 #include "inkscape-cairo.h"
  23 #include "canvas-bpath.h"
  24 #include "display/sp-canvas-group.h"
  25 #include "display/curve.h"
  26 #include "display/inkscape-cairo.h"
  27 #include "libnr/nr-pixops.h"
  28 #include "helper/geom.h"
  29
  30
  31 void nr_pixblock_render_bpath_rgba (Shape* theS,uint32_t color,NRRectL &area,char* destBuf,int stride);
  32
  33 static void sp_canvas_bpath_class_init (SPCanvasBPathClass *klass);
  34 static void sp_canvas_bpath_init (SPCanvasBPath *path);
  35 static void sp_canvas_bpath_destroy (GtkObject *object);
  36
  37 static void sp_canvas_bpath_update (SPCanvasItem *item, Geom::Matrix const &affine, unsigned int flags);
  38 static void sp_canvas_bpath_render (SPCanvasItem *item, SPCanvasBuf *buf);
  39 static double sp_canvas_bpath_point (SPCanvasItem *item, Geom::Point p, SPCanvasItem **actual_item);
  40
  41 static SPCanvasItemClass *parent_class;
  42
  43 GtkType
  44 sp_canvas_bpath_get_type (void)
  45 {
  46     static GtkType type = 0;
  47     if (!type) {
  48         GtkTypeInfo info = {
  49             (gchar *)"SPCanvasBPath",
  50             sizeof (SPCanvasBPath),
  51             sizeof (SPCanvasBPathClass),
  52             (GtkClassInitFunc) sp_canvas_bpath_class_init,
  53             (GtkObjectInitFunc) sp_canvas_bpath_init,
  54             NULL, NULL, NULL
  55         };
  56         type = gtk_type_unique (SP_TYPE_CANVAS_ITEM, &info);
  57     }
  58     return type;
  59 }
  60
  61 static void
  62 sp_canvas_bpath_class_init (SPCanvasBPathClass *klass)
  63 {
  64     GtkObjectClass *object_class;
  65     SPCanvasItemClass *item_class;
  66
  67     object_class = GTK_OBJECT_CLASS (klass);
  68     item_class = (SPCanvasItemClass *) klass;
  69
  70     parent_class = (SPCanvasItemClass*)gtk_type_class (SP_TYPE_CANVAS_ITEM);
  71
  72     object_class->destroy = sp_canvas_bpath_destroy;
  73
  74     item_class->update = sp_canvas_bpath_update;
  75     item_class->render = sp_canvas_bpath_render;
  76     item_class->point = sp_canvas_bpath_point;
  77 }
  78
  79 static void
  80 sp_canvas_bpath_init (SPCanvasBPath * bpath)
  81 {
  82     bpath->fill_rgba = 0x00000000;
  83     bpath->fill_rule = SP_WIND_RULE_EVENODD;
  84
  85     bpath->stroke_rgba = 0x00000000;
  86     bpath->stroke_width = 1.0;
  87     bpath->stroke_linejoin = SP_STROKE_LINEJOIN_MITER;
  88     bpath->stroke_linecap = SP_STROKE_LINECAP_BUTT;
  89     bpath->stroke_miterlimit = 11.0;
  90 }
  91
  92 static void
  93 sp_canvas_bpath_destroy (GtkObject *object)
  94 {
  95     SPCanvasBPath *cbp = SP_CANVAS_BPATH (object);
  96
  97     if (cbp->curve) {
  98         cbp->curve = cbp->curve->unref();
  99     }
 100
 101     if (GTK_OBJECT_CLASS (parent_class)->destroy)
 102         (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
 103 }
 104
 105 static void
 106 sp_canvas_bpath_update (SPCanvasItem *item, Geom::Matrix const &affine, unsigned int flags)
 107 {
 108     SPCanvasBPath *cbp = SP_CANVAS_BPATH (item);
 109
 110     sp_canvas_request_redraw (item->canvas, (int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);
 111
 112     if (((SPCanvasItemClass *) parent_class)->update)
 113         ((SPCanvasItemClass *) parent_class)->update (item, affine, flags);
 114
 115     sp_canvas_item_reset_bounds (item);
 116
 117     if (!cbp->curve) return;
 118
 119     cbp->affine = affine;
 120
 121     Geom::OptRect bbox = bounds_exact_transformed(cbp->curve->get_pathvector(), affine);
 122
 123     if (bbox) {
 124         item->x1 = (int)bbox->min()[Geom::X] - 1;
 125         item->y1 = (int)bbox->min()[Geom::Y] - 1;
 126         item->x2 = (int)bbox->max()[Geom::X] + 1;
 127         item->y2 = (int)bbox->max()[Geom::Y] + 1;
 128     } else {
 129         item->x1 = 0;
 130         item->y1 = 0;
 131         item->x2 = 0;
 132         item->y2 = 0;
 133     }
 134     sp_canvas_request_redraw (item->canvas, (int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);
 135 }
 136
 137 static void
 138 sp_canvas_bpath_render (SPCanvasItem *item, SPCanvasBuf *buf)
 139 {
 140     SPCanvasBPath *cbp = SP_CANVAS_BPATH (item);
 141
 142     sp_canvas_prepare_buffer(buf);
 143
 144     Geom::Rect area (Geom::Point(buf->rect.x0, buf->rect.y0), Geom::Point(buf->rect.x1, buf->rect.y1));
 145
 146     if ( !cbp->curve  ||
 147          ((cbp->stroke_rgba & 0xff) == 0 && (cbp->fill_rgba & 0xff) == 0 ) ||
 148          cbp->curve->get_segment_count() < 1)
 149         return;
 150
 151     if (!buf->ct)
 152         return;
 153
 154     bool dofill = ((cbp->fill_rgba & 0xff) != 0);
 155     bool dostroke = ((cbp->stroke_rgba & 0xff) != 0);
 156
 157     cairo_set_tolerance(buf->ct, 1.25); // low quality, but good enough for canvas items
 158     cairo_new_path(buf->ct);
 159
 160     if (!dofill)
 161         feed_pathvector_to_cairo (buf->ct, cbp->curve->get_pathvector(), cbp->affine, area, true, 1);
 162     else
 163         feed_pathvector_to_cairo (buf->ct, cbp->curve->get_pathvector(), cbp->affine, area, false, 1);
 164
 165     if (dofill) {
 166         // RGB / BGR
 167         cairo_set_source_rgba(buf->ct, SP_RGBA32_B_F(cbp->fill_rgba), SP_RGBA32_G_F(cbp->fill_rgba), SP_RGBA32_R_F(cbp->fill_rgba), SP_RGBA32_A_F(cbp->fill_rgba));
 168         cairo_set_fill_rule(buf->ct, cbp->fill_rule == SP_WIND_RULE_EVENODD? CAIRO_FILL_RULE_EVEN_ODD
 169                             : CAIRO_FILL_RULE_WINDING);
 170         if (dostroke)
 171             cairo_fill_preserve(buf->ct);
 172         else
 173             cairo_fill(buf->ct);
 174     }
 175
 176     if (dostroke) {
 177         // RGB / BGR
 178         cairo_set_source_rgba(buf->ct, SP_RGBA32_B_F(cbp->stroke_rgba), SP_RGBA32_G_F(cbp->stroke_rgba), SP_RGBA32_R_F(cbp->stroke_rgba), SP_RGBA32_A_F(cbp->stroke_rgba));
 179         cairo_set_line_width(buf->ct, 1);
 180         if (cbp->dashes[0] != 0 && cbp->dashes[1] != 0) {
 181             cairo_set_dash (buf->ct, cbp->dashes, 2, 0);
 182         }
 183         cairo_stroke(buf->ct);
 184     }
 185 }
 186
 187 static double
 188 sp_canvas_bpath_point (SPCanvasItem *item, Geom::Point p, SPCanvasItem **actual_item)
 189 {
 190     SPCanvasBPath *cbp = SP_CANVAS_BPATH (item);
 191
 192     if ( !cbp->curve  ||
 193          ((cbp->stroke_rgba & 0xff) == 0 && (cbp->fill_rgba & 0xff) == 0 ) ||
 194          cbp->curve->get_segment_count() < 1)
 195         return NR_HUGE;
 196
 197     double width = 0.5;
 198     Geom::Rect viewbox = item->canvas->getViewbox();
 199     viewbox.expandBy (width);
 200     double dist = NR_HUGE;
 201     pathv_matrix_point_bbox_wind_distance(cbp->curve->get_pathvector(), cbp->affine, p, NULL, NULL, &dist, 0.5, &viewbox);
 202
 203     if (dist <= 1.0) {
 204         *actual_item = item;
 205     }
 206
 207     return dist;
 208 }
 209
 210 SPCanvasItem *
 211 sp_canvas_bpath_new (SPCanvasGroup *parent, SPCurve *curve)
 212 {
 213     g_return_val_if_fail (parent != NULL, NULL);
 214     g_return_val_if_fail (SP_IS_CANVAS_GROUP (parent), NULL);
 215
 216     SPCanvasItem *item = sp_canvas_item_new (parent, SP_TYPE_CANVAS_BPATH, NULL);
 217
 218     sp_canvas_bpath_set_bpath (SP_CANVAS_BPATH (item), curve);
 219
 220     return item;
 221 }
 222
 223 void
 224 sp_canvas_bpath_set_bpath (SPCanvasBPath *cbp, SPCurve *curve)
 225 {
 226     g_return_if_fail (cbp != NULL);
 227     g_return_if_fail (SP_IS_CANVAS_BPATH (cbp));
 228
 229     if (cbp->curve) {
 230         cbp->curve = cbp->curve->unref();
 231     }
 232
 233     if (curve) {
 234         cbp->curve = curve->ref();
 235     }
 236
 237     sp_canvas_item_request_update (SP_CANVAS_ITEM (cbp));
 238 }
 239
 240 void
 241 sp_canvas_bpath_set_fill (SPCanvasBPath *cbp, guint32 rgba, SPWindRule rule)
 242 {
 243     g_return_if_fail (cbp != NULL);
 244     g_return_if_fail (SP_IS_CANVAS_BPATH (cbp));
 245
 246     cbp->fill_rgba = rgba;
 247     cbp->fill_rule = rule;
 248
 249     sp_canvas_item_request_update (SP_CANVAS_ITEM (cbp));
 250 }
 251
 252 void
 253 sp_canvas_bpath_set_stroke (SPCanvasBPath *cbp, guint32 rgba, gdouble width, SPStrokeJoinType join, SPStrokeCapType cap, double dash, double gap)
 254 {
 255     g_return_if_fail (cbp != NULL);
 256     g_return_if_fail (SP_IS_CANVAS_BPATH (cbp));
 257
 258     cbp->stroke_rgba = rgba;
 259     cbp->stroke_width = MAX (width, 0.1);
 260     cbp->stroke_linejoin = join;
 261     cbp->stroke_linecap = cap;
 262     cbp->dashes[0] = dash;
 263     cbp->dashes[1] = gap;
 264
 265     sp_canvas_item_request_update (SP_CANVAS_ITEM (cbp));
 266 }
 267
 268 /*
 269   Local Variables:
 270   mode:c++
 271   c-file-style:"stroustrup"
 272   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 273   indent-tabs-mode:nil
 274   fill-column:99
 275   End:
 276 */
 277 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :