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canvas-simplerect.c

#include <stdio.h>
#include <math.h>
#include <gtk-canvas.h>

#include "canvas-simplerect.h"
#include "rgb_macros.h"

enum {
      ARG_0,
      ARG_X1,
      ARG_Y1,
      ARG_X2,
      ARG_Y2,
      ARG_OUTLINE_PIXELS,
      ARG_OUTLINE_WHAT,
      ARG_FILL,
      ARG_FILL_COLOR_RGBA,
      ARG_OUTLINE_COLOR_RGBA,
      ARG_DRAW
      
};

static void gtk_canvas_simplerect_class_init (GtkCanvasSimpleRectClass *class);
static void gtk_canvas_simplerect_init       (GtkCanvasSimpleRect      *simplerect);
static void gtk_canvas_simplerect_set_arg    (GtkObject              *object,
                                    GtkArg                 *arg,
                                    guint                   arg_id);
static void gtk_canvas_simplerect_get_arg    (GtkObject              *object,
                                    GtkArg                 *arg,
                                    guint                   arg_id);

static void   gtk_canvas_simplerect_update      (GtkCanvasItem *item, double *affine, ArtSVP *clip_path, int flags);
static void   gtk_canvas_simplerect_bounds      (GtkCanvasItem *item, double *x1, double *y1, double *x2, double *y2);
static double gtk_canvas_simplerect_point (GtkCanvasItem *item, double x, double y, int cx, int cy, GtkCanvasItem **actual_item);
static void   gtk_canvas_simplerect_render (GtkCanvasItem *item, GtkCanvasBuf *buf);
static void   gtk_canvas_simplerect_draw (GtkCanvasItem *item, GdkDrawable *drawable, int x, int y, int w, int h);

static GtkCanvasItemClass *parent_class;


GtkType
gtk_canvas_simplerect_get_type (void)
{
      static GtkType simplerect_type = 0;

      if (!simplerect_type) {
            GtkTypeInfo simplerect_info = {
                  "GtkCanvasSimpleRect",
                  sizeof (GtkCanvasSimpleRect),
                  sizeof (GtkCanvasSimpleRectClass),
                  (GtkClassInitFunc) gtk_canvas_simplerect_class_init,
                  (GtkObjectInitFunc) gtk_canvas_simplerect_init,
                  NULL, /* reserved_1 */
                  NULL, /* reserved_2 */
                  (GtkClassInitFunc) NULL
            };

            simplerect_type = gtk_type_unique (gtk_canvas_item_get_type (), &simplerect_info);
      }

      return simplerect_type;
}

static void
gtk_canvas_simplerect_class_init (GtkCanvasSimpleRectClass *class)
{
      GtkObjectClass *object_class;
      GtkCanvasItemClass *item_class;

      object_class = (GtkObjectClass *) class;
      item_class = (GtkCanvasItemClass *) class;

      parent_class = gtk_type_class (gtk_canvas_item_get_type ());

      gtk_object_add_arg_type ("GtkCanvasSimpleRect::x1", GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_X1);
      gtk_object_add_arg_type ("GtkCanvasSimpleRect::y1", GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_Y1);
      gtk_object_add_arg_type ("GtkCanvasSimpleRect::x2", GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_X2);
      gtk_object_add_arg_type ("GtkCanvasSimpleRect::y2", GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_Y2);
      gtk_object_add_arg_type ("GtkCanvasSimpleRect::fill", GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_FILL);
      gtk_object_add_arg_type ("GtkCanvasSimpleRect::draw", GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_DRAW);
      gtk_object_add_arg_type ("GtkCanvasSimpleRect::fill_color_rgba", GTK_TYPE_INT, GTK_ARG_READWRITE, ARG_FILL_COLOR_RGBA);
      gtk_object_add_arg_type ("GtkCanvasSimpleRect::outline_color_rgba", GTK_TYPE_INT, GTK_ARG_READWRITE, ARG_OUTLINE_COLOR_RGBA);
      gtk_object_add_arg_type ("GtkCanvasSimpleRect::outline_pixels", GTK_TYPE_INT, GTK_ARG_READWRITE, ARG_OUTLINE_PIXELS);
      gtk_object_add_arg_type ("GtkCanvasSimpleRect::outline_what", GTK_TYPE_INT, GTK_ARG_READWRITE, ARG_OUTLINE_WHAT);

      object_class->set_arg = gtk_canvas_simplerect_set_arg;
      object_class->get_arg = gtk_canvas_simplerect_get_arg;

      item_class->update = gtk_canvas_simplerect_update;
      item_class->bounds = gtk_canvas_simplerect_bounds;
      item_class->point = gtk_canvas_simplerect_point;
      item_class->render = gtk_canvas_simplerect_render;
      item_class->draw = gtk_canvas_simplerect_draw;
}

static void
gtk_canvas_simplerect_init (GtkCanvasSimpleRect *simplerect)
{
      simplerect->x1 = 0.0;
      simplerect->y1 = 0.0;
      simplerect->x2 = 0.0;
      simplerect->y2 = 0.0;
      simplerect->fill = TRUE;
      simplerect->draw = TRUE;
      simplerect->full_draw_on_update = TRUE;
      simplerect->fill_color = 0;
      simplerect->outline_color = 0;
      simplerect->outline_pixels = 1;
      simplerect->outline_what = 0xf;

      GTK_CANVAS_ITEM(simplerect)->object.flags |= GTK_CANVAS_ITEM_NO_AUTO_REDRAW;
}

static void
gtk_canvas_simplerect_bounds (GtkCanvasItem *item, double *x1, double *y1, double *x2, double *y2)
{
      GtkCanvasSimpleRect *simplerect = GTK_CANVAS_SIMPLERECT (item);

      *x1 = simplerect->x1;
      *y1 = simplerect->y1;
      *x2 = simplerect->x2 + 1;
      *y2 = simplerect->y2 + 1;

}

static void 
gtk_canvas_simplerect_reset_bounds (GtkCanvasItem *item)
{
      GtkCanvasSimpleRect* simplerect;
      double x1, x2, y1, y2;
      double old_x1, old_x2, old_y1, old_y2;
      double a, b;
      
      old_x1 = item->x1;
      old_y1 = item->y1;
      old_x2 = item->x2;
      old_y2 = item->y2;

      gtk_canvas_simplerect_bounds (item, &x1, &y1, &x2, &y2);
      gtk_canvas_item_i2w (item, &x1, &y1);
      gtk_canvas_item_i2w (item, &x2, &y2);

      item->x1 = x1;
      item->y1 = y1;
      item->x2 = x2;
      item->y2 = y2;

      /* now compute bounding box in canvas units */

      simplerect = GTK_CANVAS_SIMPLERECT (item);

      gtk_canvas_w2c (GTK_CANVAS(item->canvas), x1, y1, &simplerect->bbox_ulx, &simplerect->bbox_uly);
      gtk_canvas_w2c (GTK_CANVAS(item->canvas), x2, y2, &simplerect->bbox_lrx, &simplerect->bbox_lry);

      /* now queue redraws for changed areas */

      if (item->x1 != old_x1) {
            
            /* left edge changed. redraw the area that altered */
            
            a = MIN(item->x1, old_x1); 
            b = MAX(item->x1, old_x1);
            gtk_canvas_request_redraw (item->canvas, a - 1, item->y1, b + 1, item->y2);
      }
      
      if (item->x2 != old_x2) {
            
            /* right edge changed. redraw the area that altered */
            
            a = MIN(item->x2, old_x2);
            b = MAX(item->x2, old_x2);
            gtk_canvas_request_redraw (item->canvas, a - 1, item->y1, b + 1, item->y2);
      }
      
      if (item->y1 != old_y1) {
            
            /* top edge changed. redraw the area that altered */
            
            a = MIN(item->y1, old_y1);
            b = MAX(item->y1, old_y1);
            gtk_canvas_request_redraw (item->canvas, item->x1, a - 1, item->x2, b + 1);
      }
      
      if (item->y2 != old_y2) {
            
            /* lower edge changed. redraw the area that altered */
            
            a = MIN(item->y2, old_y2);
            b = MAX(item->y2, old_y2);
            gtk_canvas_request_redraw (item->canvas, item->x1, a - 1, item->x2, b + 1);
      }
}

/* 
 * CANVAS CALLBACKS 
 */

static void
gtk_canvas_simplerect_set_arg (GtkObject *object, GtkArg *arg, guint arg_id)
{
      GtkCanvasItem *item;
      GtkCanvasSimpleRect *simplerect;
      int update;
      int bounds_changed;

      item = GTK_CANVAS_ITEM (object);
      simplerect = GTK_CANVAS_SIMPLERECT (object);

      update = FALSE;
      bounds_changed = FALSE;

      switch (arg_id) {
      case ARG_X1:
              if (simplerect->x1 != GTK_VALUE_DOUBLE (*arg)) {
                    simplerect->x1 = GTK_VALUE_DOUBLE (*arg);
                  bounds_changed = TRUE;
            }
            break;

      case ARG_Y1:
              if (simplerect->y1 != GTK_VALUE_DOUBLE (*arg)) {
                    simplerect->y1 = GTK_VALUE_DOUBLE (*arg);
                  bounds_changed = TRUE;
            }
            break;

      case ARG_X2:
              if (simplerect->x2 != GTK_VALUE_DOUBLE (*arg)) {
                    simplerect->x2 = GTK_VALUE_DOUBLE (*arg);
                  bounds_changed = TRUE;
            }
            break;

      case ARG_Y2:
              if (simplerect->y2 != GTK_VALUE_DOUBLE (*arg)) {
                    simplerect->y2 = GTK_VALUE_DOUBLE (*arg);
                  bounds_changed = TRUE;
            }
            break;

      case ARG_DRAW:
              if (simplerect->draw != GTK_VALUE_BOOL (*arg)) {
                    simplerect->draw = GTK_VALUE_BOOL (*arg);
                  update = TRUE;
            }
            break;


      case ARG_FILL:
              if (simplerect->fill != GTK_VALUE_BOOL (*arg)) {
                    simplerect->fill = GTK_VALUE_BOOL (*arg);
                  update = TRUE;
            }
            break;

      case ARG_FILL_COLOR_RGBA:
            if (simplerect->fill_color != GTK_VALUE_INT(*arg)) {
                  simplerect->fill_color = GTK_VALUE_INT(*arg);
                  update = TRUE;
            }
            break;

      case ARG_OUTLINE_COLOR_RGBA:
            if (simplerect->outline_color != GTK_VALUE_INT(*arg)) {
                  simplerect->outline_color = GTK_VALUE_INT(*arg);
                  update = TRUE;
            }
            break;

      case ARG_OUTLINE_PIXELS:
            if (simplerect->outline_pixels != GTK_VALUE_INT(*arg)) {
                  simplerect->outline_pixels = GTK_VALUE_INT(*arg);
                  update = TRUE;
            }
            break;

      case ARG_OUTLINE_WHAT:
            if (simplerect->outline_what != GTK_VALUE_INT(*arg)) {
                  simplerect->outline_what = GTK_VALUE_INT(*arg);
                  update = TRUE;
            }
            break;

      default:
            break;
      }

      simplerect->full_draw_on_update = update;

      if (update || bounds_changed) {
            gtk_canvas_item_request_update (item);
      }
}

static void
gtk_canvas_simplerect_get_arg (GtkObject *object, GtkArg *arg, guint arg_id)
{
      GtkCanvasSimpleRect *simplerect;

      simplerect = GTK_CANVAS_SIMPLERECT (object);

      switch (arg_id) {
      case ARG_X1:
            GTK_VALUE_DOUBLE (*arg) = simplerect->x1;
            break;
      case ARG_Y1:
            GTK_VALUE_DOUBLE (*arg) = simplerect->y1;
            break;
      case ARG_X2:
            GTK_VALUE_DOUBLE (*arg) = simplerect->x2;
            break;
      case ARG_Y2:
            GTK_VALUE_DOUBLE (*arg) = simplerect->y2;
            break;
      case ARG_DRAW:
            GTK_VALUE_BOOL (*arg) = simplerect->draw;
            break;
      case ARG_FILL:
            GTK_VALUE_BOOL (*arg) = simplerect->fill;
            break;
      case ARG_FILL_COLOR_RGBA:
            GTK_VALUE_INT (*arg) = simplerect->fill_color;
            break;
      case ARG_OUTLINE_COLOR_RGBA:
            GTK_VALUE_INT (*arg) = simplerect->outline_color;
            break;
      case ARG_OUTLINE_PIXELS:
            GTK_VALUE_INT (*arg) = simplerect->outline_pixels;
            break;
      case ARG_OUTLINE_WHAT:
            GTK_VALUE_INT (*arg) = simplerect->outline_what;
            break;
      default:
            arg->type = GTK_TYPE_INVALID;
            break;
      }
}

static void
gtk_canvas_simplerect_update (GtkCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
{
      GtkCanvasSimpleRect *simplerect;
      unsigned char foo;

      simplerect = GTK_CANVAS_SIMPLERECT (item);

      if (parent_class->update)
            (* parent_class->update) (item, affine, clip_path, flags);

      gtk_canvas_simplerect_reset_bounds (item);

      if (simplerect->full_draw_on_update) {
            gtk_canvas_request_redraw (item->canvas, 
                                 simplerect->bbox_ulx,
                                 simplerect->bbox_uly,
                                 simplerect->bbox_lrx+1,
                                 simplerect->bbox_lry+1);
            simplerect->full_draw_on_update = FALSE;
      }

      UINT_TO_RGBA (simplerect->fill_color, &simplerect->fill_r, &simplerect->fill_g, &simplerect->fill_b, &simplerect->fill_a);
      UINT_TO_RGBA (simplerect->outline_color, &simplerect->outline_r, &simplerect->outline_g, &simplerect->outline_b, &foo);
}

#define SIMPLERECT_FAST_RENDERER
#ifdef SIMPLERECT_FAST_RENDERER

static void
gtk_canvas_simplerect_render (GtkCanvasItem *item,
                        GtkCanvasBuf *buf)
{
      GtkCanvasSimpleRect *simplerect;
      int end, begin;
      int ey, sy;
      unsigned int i;
      ArtIRect intersection;
      ArtIRect self;

      simplerect = GTK_CANVAS_SIMPLERECT (item);

      if (parent_class->render) {
            (*parent_class->render) (item, buf);
      }

      if (buf->is_bg) {

            // this can be useful for debugging/understanding how the canvas redraws
            // stuff.

            // gint randr, randg, randb;
            // randr = random() % 255;
            // randg = random() % 255;
            // randb = random() % 255;
            // PAINT_BOX(buf, randr, randg, randb, 255, buf->rect.x0, buf->rect.y0, buf->rect.x1, buf->rect.y1);

            gtk_canvas_buf_ensure_buf (buf);
            buf->is_bg = FALSE;
      }

      if (!simplerect->draw) {
            return;
      }
      
      self.x0 = simplerect->bbox_ulx;
      self.y0 = simplerect->bbox_uly;
      self.x1 = simplerect->bbox_lrx;
      self.y1 = simplerect->bbox_lry;

      art_irect_intersect (&intersection, &self, &buf->rect);

      begin = MAX(simplerect->bbox_ulx, buf->rect.x0);
      end = MIN((simplerect->bbox_lrx-1), buf->rect.x1);

      sy = simplerect->bbox_uly;
      ey = simplerect->bbox_lry-1;

      if (simplerect->fill) {
            
            // this can be useful for debugging/understanding how the canvas redraws
            // stuff.
            
            // gint randr, randg, randb;
            // randr = random() % 255;
            // randg = random() % 255;
            // randb = random() % 255;
            // PAINT_BOX(buf, randr, randg, randb, simplerect->fill_a, begin, sy, end, ey);
            
            FAST_PAINT_BOX (buf, simplerect->fill_r, simplerect->fill_g, simplerect->fill_b, simplerect->fill_a, 
                        intersection.x0, intersection.y0,
                        intersection.x1, intersection.y1);
            
      }

      for (i = 0; i < simplerect->outline_pixels; ++i) {

            if (simplerect->outline_what & 0x1) {
                  if (begin == simplerect->bbox_ulx) {
                        PAINT_VERT(buf, simplerect->outline_r, simplerect->outline_g, simplerect->outline_b, begin + i, sy, ey);
                  }
            }

            if (simplerect->outline_what & 0x2) {
                  if (end == (simplerect->bbox_lrx - 1)) {
                        PAINT_VERT(buf, simplerect->outline_r, simplerect->outline_g, simplerect->outline_b, end - i, sy, ey + 1);
                  }
            }

            if (simplerect->outline_what & 0x4) {
                  PAINT_HORIZ(buf, simplerect->outline_r, simplerect->outline_g, simplerect->outline_b, begin, end, sy+i);
            }
      
            if (simplerect->outline_what & 0x8) {
                  PAINT_HORIZ(buf, simplerect->outline_r, simplerect->outline_g, simplerect->outline_b, begin, end + 1, ey-i);
            }
      }
}

#else /* SIMPLERECT_FAST_RENDERER */

static void
gtk_canvas_simplerect_render (GtkCanvasItem *item,
                        GtkCanvasBuf *buf)
{
      GtkCanvasSimpleRect *simplerect;
      int end, begin;
      int ey, sy;
      unsigned int i;

      simplerect = GTK_CANVAS_SIMPLERECT (item);

      if (parent_class->render) {
            (*parent_class->render) (item, buf);
      }

      if (buf->is_bg) {

            // this can be useful for debugging/understanding how the canvas redraws
            // stuff.

            // gint randr, randg, randb;
            // randr = random() % 255;
            // randg = random() % 255;
            // randb = random() % 255;
            // PAINT_BOX(buf, randr, randg, randb, 255, buf->rect.x0, buf->rect.y0, buf->rect.x1, buf->rect.y1);

            gtk_canvas_buf_ensure_buf (buf);
            buf->is_bg = FALSE;
      }

      if (!simplerect->draw) {
            return;
      }

      begin = MAX(simplerect->bbox_ulx,buf->rect.x0);
      end = MIN((simplerect->bbox_lrx-1),buf->rect.x1);

      sy = simplerect->bbox_uly;
      ey = simplerect->bbox_lry-1;

      if (simplerect->fill) {
            
            // this can be useful for debugging/understanding how the canvas redraws
            // stuff.
            
            // gint randr, randg, randb;
            // randr = random() % 255;
            // randg = random() % 255;
            // randb = random() % 255;
            // PAINT_BOX(buf, randr, randg, randb, simplerect->fill_a, begin, sy, end, ey);
            
            PAINT_BOX(buf, simplerect->fill_r, simplerect->fill_g, simplerect->fill_b, simplerect->fill_a, begin, sy, end, ey);
      }

      for (i = 0; i < simplerect->outline_pixels; ++i) {

            if (simplerect->outline_what & 0x1) {
                  if (begin == simplerect->bbox_ulx) {
                        PAINT_VERT(buf, simplerect->outline_r, simplerect->outline_g, simplerect->outline_b, begin + i, sy, ey);
                  }
            }

            if (simplerect->outline_what & 0x2) {
                  if (end == (simplerect->bbox_lrx - 1)) {
                        PAINT_VERT(buf, simplerect->outline_r, simplerect->outline_g, simplerect->outline_b, end - i, sy, ey + 1);
                  }
            }

            if (simplerect->outline_what & 0x4) {
                  PAINT_HORIZ(buf, simplerect->outline_r, simplerect->outline_g, simplerect->outline_b, begin, end, sy+i);
            }
      
            if (simplerect->outline_what & 0x8) {
                  PAINT_HORIZ(buf, simplerect->outline_r, simplerect->outline_g, simplerect->outline_b, begin, end + 1, ey-i);
            }
      }
}
#endif /* SIMPLERECT_FAST_RENDERER */

static void
gtk_canvas_simplerect_draw (GtkCanvasItem *item,
                      GdkDrawable *drawable,
                      int x, int y,
                      int width, int height)
{
      fprintf (stderr, "please don't use the CanvasSimpleRect item in a non-aa Canvas\n");
      abort ();
}

static double
gtk_canvas_simplerect_point (GtkCanvasItem *item, double x, double y, int cx, int cy, GtkCanvasItem **actual_item)
{
      GtkCanvasSimpleRect *simplerect;
      double x1, y1, x2, y2;
      double dx, dy;

      simplerect = GTK_CANVAS_SIMPLERECT (item);

      *actual_item = item;

      /* Find the bounds for the rectangle plus its outline width */

      gtk_canvas_simplerect_bounds (item, &x1, &y1, &x2, &y2);

      /* Is point inside rectangle */
      
      if ((x >= x1) && (y >= y1) && (x <= x2) && (y <= y2)) {
            return 0.0;
      }

      /* Point is outside rectangle */

      if (x < x1)
            dx = x1 - x;
      else if (x > x2)
            dx = x - x2;
      else
            dx = 0.0;

      if (y < y1)
            dy = y1 - y;
      else if (y > y2)
            dy = y - y2;
      else
            dy = 0.0;

      return sqrt (dx * dx + dy * dy);
}

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