#define __SP_CANVAS_UTILS_C__

#include <2geom/matrix.h>

#include "libnr/nr-pixops.h"

#include "sp-canvas-util.h"

#include <string.h> /* for memset */

sp_canvas_update_bbox (SPCanvasItem *item, int x1, int y1, int x2, int y2)

{

sp_canvas_request_redraw (item->canvas, (int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);

item->x1 = x1;

item->y1 = y1;

item->x2 = x2;

item->y2 = y2;

sp_canvas_request_redraw (item->canvas, (int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);

}

sp_canvas_item_reset_bounds (SPCanvasItem *item)

{

item->x1 = 0.0;

item->y1 = 0.0;

item->x2 = 0.0;

item->y2 = 0.0;

}

sp_canvas_prepare_buffer (SPCanvasBuf *buf)

{

if (buf->is_empty) {

int y;

for (y = buf->rect.y0; y < buf->rect.y1; y++) {

memset (buf->buf + (y - buf->rect.y0) * buf->buf_rowstride, 0, 4 * (buf->rect.x1 - buf->rect.x0));

}

buf->is_empty = false;

}

}

Geom::Matrix sp_canvas_item_i2p_affine (SPCanvasItem * item)

{

g_assert (item != NULL); /* this may be overly zealous - it is

return item->xform;

}

Geom::Matrix sp_canvas_item_i2i_affine (SPCanvasItem * from, SPCanvasItem * to)

{

g_assert (from != NULL);

g_assert (to != NULL);

return sp_canvas_item_i2w_affine(from) * sp_canvas_item_i2w_affine(to).inverse();

}

void sp_canvas_item_set_i2w_affine (SPCanvasItem * item, Geom::Matrix const &i2w)

{

g_assert (item != NULL);

sp_canvas_item_affine_absolute(item, i2w * sp_canvas_item_i2w_affine(item->parent).inverse());

}

void sp_canvas_item_move_to_z (SPCanvasItem * item, gint z)

{

g_assert (item != NULL);

gint current_z = sp_canvas_item_order (item);

if (current_z == -1) // not found in its parent

return;

if (z == current_z)

return;

if (z > current_z) {

sp_canvas_item_raise (item, z - current_z);

} else {

sp_canvas_item_lower (item, current_z - z);

}

}

sp_canvas_item_compare_z (SPCanvasItem * a, SPCanvasItem * b)

{

gint const o_a = sp_canvas_item_order (a);

gint const o_b = sp_canvas_item_order (b);

if (o_a > o_b) return -1;

if (o_a < o_b) return 1;

return 0;

}