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-matrix-fns.h"
  26 #include <libnr/nr-pixops.h>
  27 #include <libnr/nr-convert2geom.h>
  28 #include <libnr/nr-path.h>
  29 #include "helper/geom.h"
  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, NR::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, NR::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, NR::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     const_NRBPath bp;
 122     bp.path = cbp->curve->get_bpath();
 123     NRRect bbox;
 124     nr_path_matrix_bbox_union(&bp, affine, &bbox);
 125
 126     item->x1 = (int)bbox.x0 - 1;
 127     item->y1 = (int)bbox.y0 - 1;
 128     item->x2 = (int)bbox.x1 + 1;
 129     item->y2 = (int)bbox.y1 + 1;
 130
 131     sp_canvas_request_redraw (item->canvas, (int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);
 132 }
 133
 134 static void
 135 sp_canvas_bpath_render (SPCanvasItem *item, SPCanvasBuf *buf)
 136 {
 137     SPCanvasBPath *cbp = SP_CANVAS_BPATH (item);
 138
 139     sp_canvas_prepare_buffer(buf);
 140
 141     NR::Rect area (NR::Point(buf->rect.x0, buf->rect.y0), NR::Point(buf->rect.x1, buf->rect.y1));
 142
 143     if ( !cbp->curve  ||
 144          ((cbp->stroke_rgba & 0xff) == 0 && (cbp->fill_rgba & 0xff) == 0 ) ||
 145          cbp->curve->get_length() <= 1)
 146         return;
 147
 148     if (!buf->ct)
 149         return;
 150
 151     bool dofill = ((cbp->fill_rgba & 0xff) != 0);
 152     bool dostroke = ((cbp->stroke_rgba & 0xff) != 0);
 153
 154     cairo_set_tolerance(buf->ct, 1.25); // low quality, but good enough for canvas items
 155     cairo_new_path(buf->ct);
 156
 157     if (!dofill)
 158         feed_pathvector_to_cairo (buf->ct, cbp->curve->get_pathvector(), to_2geom(cbp->affine), area, true, 1);
 159     else
 160         feed_pathvector_to_cairo (buf->ct, cbp->curve->get_pathvector(), to_2geom(cbp->affine), area, false, 1);
 161
 162     if (dofill) {
 163         // RGB / BGR
 164         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));
 165         cairo_set_fill_rule(buf->ct, cbp->fill_rule == SP_WIND_RULE_EVENODD? CAIRO_FILL_RULE_EVEN_ODD
 166                             : CAIRO_FILL_RULE_WINDING);
 167         if (dostroke)
 168             cairo_fill_preserve(buf->ct);
 169         else
 170             cairo_fill(buf->ct);
 171     }
 172
 173     if (dostroke) {
 174         // RGB / BGR
 175         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));
 176         cairo_set_line_width(buf->ct, 1);
 177         cairo_stroke(buf->ct);
 178     }
 179 }
 180
 181 static double
 182 sp_canvas_bpath_point (SPCanvasItem *item, NR::Point p, SPCanvasItem **actual_item)
 183 {
 184     SPCanvasBPath *cbp = SP_CANVAS_BPATH (item);
 185
 186     if ( !cbp->curve  ||
 187          ((cbp->stroke_rgba & 0xff) == 0 && (cbp->fill_rgba & 0xff) == 0 ) ||
 188          cbp->curve->get_length() <= 1)
 189         return NR_HUGE;
 190
 191     double width = 0.5;
 192     NR::Rect viewbox = item->canvas->getViewbox();
 193         viewbox.growBy (width);
 194     double dist = NR_HUGE;
 195     pathv_matrix_point_bbox_wind_distance(cbp->curve->get_pathvector(), cbp->affine, p, NULL, NULL, &dist, 0.5, &viewbox);
 196
 197     if (dist <= 1.0) {
 198         *actual_item = item;
 199     }
 200
 201     return dist;
 202 }
 203
 204 SPCanvasItem *
 205 sp_canvas_bpath_new (SPCanvasGroup *parent, SPCurve *curve)
 206 {
 207     g_return_val_if_fail (parent != NULL, NULL);
 208     g_return_val_if_fail (SP_IS_CANVAS_GROUP (parent), NULL);
 209
 210     SPCanvasItem *item = sp_canvas_item_new (parent, SP_TYPE_CANVAS_BPATH, NULL);
 211
 212     sp_canvas_bpath_set_bpath (SP_CANVAS_BPATH (item), curve);
 213
 214     return item;
 215 }
 216
 217 void
 218 sp_canvas_bpath_set_bpath (SPCanvasBPath *cbp, SPCurve *curve)
 219 {
 220     g_return_if_fail (cbp != NULL);
 221     g_return_if_fail (SP_IS_CANVAS_BPATH (cbp));
 222
 223     if (cbp->curve) {
 224         cbp->curve = cbp->curve->unref();
 225     }
 226
 227     if (curve) {
 228         cbp->curve = curve->ref();
 229     }
 230
 231     sp_canvas_item_request_update (SP_CANVAS_ITEM (cbp));
 232 }
 233
 234 void
 235 sp_canvas_bpath_set_fill (SPCanvasBPath *cbp, guint32 rgba, SPWindRule rule)
 236 {
 237     g_return_if_fail (cbp != NULL);
 238     g_return_if_fail (SP_IS_CANVAS_BPATH (cbp));
 239
 240     cbp->fill_rgba = rgba;
 241     cbp->fill_rule = rule;
 242
 243     sp_canvas_item_request_update (SP_CANVAS_ITEM (cbp));
 244 }
 245
 246 void
 247 sp_canvas_bpath_set_stroke (SPCanvasBPath *cbp, guint32 rgba, gdouble width, SPStrokeJoinType join, SPStrokeCapType cap)
 248 {
 249     g_return_if_fail (cbp != NULL);
 250     g_return_if_fail (SP_IS_CANVAS_BPATH (cbp));
 251
 252     cbp->stroke_rgba = rgba;
 253     cbp->stroke_width = MAX (width, 0.1);
 254     cbp->stroke_linejoin = join;
 255     cbp->stroke_linecap = cap;
 256
 257     sp_canvas_item_request_update (SP_CANVAS_ITEM (cbp));
 258 }
 259
 260
 261
 262
 263 /*
 264   Local Variables:
 265   mode:c++
 266   c-file-style:"stroustrup"
 267   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 268   indent-tabs-mode:nil
 269   fill-column:99
 270   End:
 271 */
 272 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :