src/display/canvas-bpath.cpp

   1 #define __SP_CANVAS_BPATH_C__
   2
   3 /*
   4  * Simple bezier bpath CanvasItem for inkscape
   5  *
   6  * Authors:
   7  *   Lauris Kaplinski <lauris@ximian.com>
   8  *
   9  * Copyright (C) 2001 Lauris Kaplinski and Ximian, Inc.
  10  *
  11  * Released under GNU GPL
  12  *
  13  */
  14
  15 #ifdef HAVE_CONFIG_H
  16 # include "config.h"
  17 #endif
  18 #include "color.h"
  19 #include "sp-canvas-util.h"
  20 #include "inkscape-cairo.h"
  21 #include "canvas-bpath.h"
  22 #include "display/display-forward.h"
  23 #include "display/curve.h"
  24 #include "display/inkscape-cairo.h"
  25 #include <libnr/nr-pixops.h>
  26 #include "helper/geom.h"
  27
  28 #include <sstream>
  29 #include <string.h>
  30 #include <desktop.h>
  31
  32 /**
  33 #ifdef HAVE_CONFIG_H
  34 # include "config.h"
  35 #endif
  36 #include <color.h>
  37
  38 #include <libnr/nr-pixops.h>
  39 **/
  40
  41 void nr_pixblock_render_bpath_rgba (Shape* theS,uint32_t color,NRRectL &area,char* destBuf,int stride);
  42
  43 static void sp_canvas_bpath_class_init (SPCanvasBPathClass *klass);
  44 static void sp_canvas_bpath_init (SPCanvasBPath *path);
  45 static void sp_canvas_bpath_destroy (GtkObject *object);
  46
  47 static void sp_canvas_bpath_update (SPCanvasItem *item, Geom::Matrix const &affine, unsigned int flags);
  48 static void sp_canvas_bpath_render (SPCanvasItem *item, SPCanvasBuf *buf);
  49 static double sp_canvas_bpath_point (SPCanvasItem *item, Geom::Point p, SPCanvasItem **actual_item);
  50
  51 static SPCanvasItemClass *parent_class;
  52
  53 GtkType
  54 sp_canvas_bpath_get_type (void)
  55 {
  56     static GtkType type = 0;
  57     if (!type) {
  58         GtkTypeInfo info = {
  59             (gchar *)"SPCanvasBPath",
  60             sizeof (SPCanvasBPath),
  61             sizeof (SPCanvasBPathClass),
  62             (GtkClassInitFunc) sp_canvas_bpath_class_init,
  63             (GtkObjectInitFunc) sp_canvas_bpath_init,
  64             NULL, NULL, NULL
  65         };
  66         type = gtk_type_unique (SP_TYPE_CANVAS_ITEM, &info);
  67     }
  68     return type;
  69 }
  70
  71 static void
  72 sp_canvas_bpath_class_init (SPCanvasBPathClass *klass)
  73 {
  74     GtkObjectClass *object_class;
  75     SPCanvasItemClass *item_class;
  76
  77     object_class = GTK_OBJECT_CLASS (klass);
  78     item_class = (SPCanvasItemClass *) klass;
  79
  80     parent_class = (SPCanvasItemClass*)gtk_type_class (SP_TYPE_CANVAS_ITEM);
  81
  82     object_class->destroy = sp_canvas_bpath_destroy;
  83
  84     item_class->update = sp_canvas_bpath_update;
  85     item_class->render = sp_canvas_bpath_render;
  86     item_class->point = sp_canvas_bpath_point;
  87 }
  88
  89 static void
  90 sp_canvas_bpath_init (SPCanvasBPath * bpath)
  91 {
  92     bpath->fill_rgba = 0x00000000;
  93     bpath->fill_rule = SP_WIND_RULE_EVENODD;
  94
  95     bpath->stroke_rgba = 0x00000000;
  96     bpath->stroke_width = 1.0;
  97     bpath->stroke_linejoin = SP_STROKE_LINEJOIN_MITER;
  98     bpath->stroke_linecap = SP_STROKE_LINECAP_BUTT;
  99     bpath->stroke_miterlimit = 11.0;
 100 }
 101
 102 static void
 103 sp_canvas_bpath_destroy (GtkObject *object)
 104 {
 105     SPCanvasBPath *cbp = SP_CANVAS_BPATH (object);
 106
 107     if (cbp->curve) {
 108         cbp->curve = cbp->curve->unref();
 109     }
 110
 111     if (GTK_OBJECT_CLASS (parent_class)->destroy)
 112         (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
 113 }
 114
 115 static void
 116 sp_canvas_bpath_update (SPCanvasItem *item, Geom::Matrix const &affine, unsigned int flags)
 117 {
 118     SPCanvasBPath *cbp = SP_CANVAS_BPATH (item);
 119
 120     sp_canvas_request_redraw (item->canvas, (int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);
 121
 122     if (((SPCanvasItemClass *) parent_class)->update)
 123         ((SPCanvasItemClass *) parent_class)->update (item, affine, flags);
 124
 125     sp_canvas_item_reset_bounds (item);
 126
 127     if (!cbp->curve) return;
 128
 129     cbp->affine = affine;
 130
 131     Geom::OptRect bbox = bounds_exact_transformed(cbp->curve->get_pathvector(), affine);
 132
 133     if (bbox) {
 134         item->x1 = (int)bbox->min()[Geom::X] - 1;
 135         item->y1 = (int)bbox->min()[Geom::Y] - 1;
 136         item->x2 = (int)bbox->max()[Geom::X] + 1;
 137         item->y2 = (int)bbox->max()[Geom::Y] + 1;
 138     } else {
 139         item->x1 = 0;
 140         item->y1 = 0;
 141         item->x2 = 0;
 142         item->y2 = 0;
 143     }
 144     sp_canvas_request_redraw (item->canvas, (int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);
 145 }
 146
 147 static void
 148 sp_canvas_bpath_render (SPCanvasItem *item, SPCanvasBuf *buf)
 149 {
 150     SPCanvasBPath *cbp = SP_CANVAS_BPATH (item);
 151
 152     sp_canvas_prepare_buffer(buf);
 153
 154     Geom::Rect area (Geom::Point(buf->rect.x0, buf->rect.y0), Geom::Point(buf->rect.x1, buf->rect.y1));
 155
 156     if ( !cbp->curve  ||
 157          ((cbp->stroke_rgba & 0xff) == 0 && (cbp->fill_rgba & 0xff) == 0 ) ||
 158          cbp->curve->get_segment_count() < 1)
 159         return;
 160
 161     if (!buf->ct)
 162         return;
 163
 164     bool dofill = ((cbp->fill_rgba & 0xff) != 0);
 165     bool dostroke = ((cbp->stroke_rgba & 0xff) != 0);
 166
 167     cairo_set_tolerance(buf->ct, 1.25); // low quality, but good enough for canvas items
 168     cairo_new_path(buf->ct);
 169
 170     if (!dofill)
 171         feed_pathvector_to_cairo (buf->ct, cbp->curve->get_pathvector(), cbp->affine, area, true, 1);
 172     else
 173         feed_pathvector_to_cairo (buf->ct, cbp->curve->get_pathvector(), cbp->affine, area, false, 1);
 174
 175     if (dofill) {
 176         // RGB / BGR
 177         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));
 178         cairo_set_fill_rule(buf->ct, cbp->fill_rule == SP_WIND_RULE_EVENODD? CAIRO_FILL_RULE_EVEN_ODD
 179                             : CAIRO_FILL_RULE_WINDING);
 180         if (dostroke)
 181             cairo_fill_preserve(buf->ct);
 182         else
 183             cairo_fill(buf->ct);
 184     }
 185
 186     if (dostroke) {
 187         // RGB / BGR
 188         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));
 189         cairo_set_line_width(buf->ct, 1);
 190         if (cbp->dashes[0] != 0 && cbp->dashes[1] != 0) {
 191             cairo_set_dash (buf->ct, cbp->dashes, 2, 0);
 192         }
 193         cairo_stroke(buf->ct);
 194     }
 195 }
 196
 197 static double
 198 sp_canvas_bpath_point (SPCanvasItem *item, Geom::Point p, SPCanvasItem **actual_item)
 199 {
 200     SPCanvasBPath *cbp = SP_CANVAS_BPATH (item);
 201
 202     if ( !cbp->curve  ||
 203          ((cbp->stroke_rgba & 0xff) == 0 && (cbp->fill_rgba & 0xff) == 0 ) ||
 204          cbp->curve->get_segment_count() < 1)
 205         return NR_HUGE;
 206
 207     double width = 0.5;
 208     Geom::Rect viewbox = item->canvas->getViewbox();
 209     viewbox.expandBy (width);
 210     double dist = NR_HUGE;
 211     pathv_matrix_point_bbox_wind_distance(cbp->curve->get_pathvector(), cbp->affine, p, NULL, NULL, &dist, 0.5, &viewbox);
 212
 213     if (dist <= 1.0) {
 214         *actual_item = item;
 215     }
 216
 217     return dist;
 218 }
 219
 220 SPCanvasItem *
 221 sp_canvas_bpath_new (SPCanvasGroup *parent, SPCurve *curve)
 222 {
 223     g_return_val_if_fail (parent != NULL, NULL);
 224     g_return_val_if_fail (SP_IS_CANVAS_GROUP (parent), NULL);
 225
 226     SPCanvasItem *item = sp_canvas_item_new (parent, SP_TYPE_CANVAS_BPATH, NULL);
 227
 228     sp_canvas_bpath_set_bpath (SP_CANVAS_BPATH (item), curve);
 229
 230     return item;
 231 }
 232
 233 void
 234 sp_canvas_bpath_set_bpath (SPCanvasBPath *cbp, SPCurve *curve)
 235 {
 236     g_return_if_fail (cbp != NULL);
 237     g_return_if_fail (SP_IS_CANVAS_BPATH (cbp));
 238
 239     if (cbp->curve) {
 240         cbp->curve = cbp->curve->unref();
 241     }
 242
 243     if (curve) {
 244         cbp->curve = curve->ref();
 245     }
 246
 247     sp_canvas_item_request_update (SP_CANVAS_ITEM (cbp));
 248 }
 249
 250 void
 251 sp_canvas_bpath_set_fill (SPCanvasBPath *cbp, guint32 rgba, SPWindRule rule)
 252 {
 253     g_return_if_fail (cbp != NULL);
 254     g_return_if_fail (SP_IS_CANVAS_BPATH (cbp));
 255
 256     cbp->fill_rgba = rgba;
 257     cbp->fill_rule = rule;
 258
 259     sp_canvas_item_request_update (SP_CANVAS_ITEM (cbp));
 260 }
 261
 262 void
 263 sp_canvas_bpath_set_stroke (SPCanvasBPath *cbp, guint32 rgba, gdouble width, SPStrokeJoinType join, SPStrokeCapType cap, double dash, double gap)
 264 {
 265     g_return_if_fail (cbp != NULL);
 266     g_return_if_fail (SP_IS_CANVAS_BPATH (cbp));
 267
 268     cbp->stroke_rgba = rgba;
 269     cbp->stroke_width = MAX (width, 0.1);
 270     cbp->stroke_linejoin = join;
 271     cbp->stroke_linecap = cap;
 272     cbp->dashes[0] = dash;
 273     cbp->dashes[1] = gap;
 274
 275     sp_canvas_item_request_update (SP_CANVAS_ITEM (cbp));
 276 }
 277
 278 /*
 279   Local Variables:
 280   mode:c++
 281   c-file-style:"stroustrup"
 282   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 283   indent-tabs-mode:nil
 284   fill-column:99
 285   End:
 286 */
 287 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :