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