/* PSPP - a program for statistical analysis.
- Copyright (C) 2009 Free Software Foundation, Inc.
+ Copyright (C) 2009, 2010 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
page->params->draw_cell (page->params->aux, cell, bb, clip);
}
-/* Renders PAGE, by calling the 'draw_line' and 'draw_cell' functions from the
- render_params provided to render_page_create(). */
-void
-render_page_draw (const struct render_page *page)
+/* Draws the cells of PAGE indicated in BB. */
+static void
+render_page_draw_cells (const struct render_page *page,
+ int bb[TABLE_N_AXES][2])
{
int x, y;
- for (y = 0; y <= page->n[V] * 2; y++)
- for (x = 0; x <= page->n[H] * 2; )
+ for (y = bb[V][0]; y < bb[V][1]; y++)
+ for (x = bb[H][0]; x < bb[H][1]; )
if (is_rule (x) || is_rule (y))
{
int d[TABLE_N_AXES];
struct table_cell cell;
table_get_cell (page->table, x / 2, y / 2, &cell);
- if (y / 2 == cell.d[V][0])
+ if (y == bb[V][0] || y / 2 == cell.d[V][0])
render_cell (page, &cell);
x = rule_ofs (cell.d[H][1]);
table_cell_free (&cell);
}
}
+
+/* Renders PAGE, by calling the 'draw_line' and 'draw_cell' functions from the
+ render_params provided to render_page_create(). */
+void
+render_page_draw (const struct render_page *page)
+{
+ int bb[TABLE_N_AXES][2];
+
+ bb[H][0] = 0;
+ bb[H][1] = page->n[H] * 2 + 1;
+ bb[V][0] = 0;
+ bb[V][1] = page->n[V] * 2 + 1;
+
+ render_page_draw_cells (page, bb);
+}
+
+/* Returns the greatest value i, 0 <= i < n, such that cp[i] <= x0. */
+static int
+get_clip_min_extent (int x0, const int cp[], int n)
+{
+ int low, high, best;
+
+ low = 0;
+ high = n;
+ best = 0;
+ while (low < high)
+ {
+ int middle = low + (high - low) / 2;
+
+ if (cp[middle] <= x0)
+ {
+ best = middle;
+ low = middle + 1;
+ }
+ else
+ high = middle;
+ }
+
+ return best;
+}
+
+/* Returns the least value i, 0 <= i < n, such that cp[i + 1] >= x1. */
+static int
+get_clip_max_extent (int x1, const int cp[], int n)
+{
+ int low, high, best;
+
+ low = 0;
+ high = n;
+ best = n;
+ while (low < high)
+ {
+ int middle = low + (high - low) / 2;
+
+ if (cp[middle] >= x1)
+ best = high = middle;
+ else
+ low = middle + 1;
+ }
+
+ return best;
+}
+
+/* Renders the cells of PAGE that intersect (X,Y)-(X+W,Y+H), by calling the
+ 'draw_line' and 'draw_cell' functions from the render_params provided to
+ render_page_create(). */
+void
+render_page_draw_region (const struct render_page *page,
+ int x, int y, int w, int h)
+{
+ int bb[TABLE_N_AXES][2];
+
+ bb[H][0] = get_clip_min_extent (x, page->cp[H], page->n[H] * 2 + 1);
+ bb[H][1] = get_clip_max_extent (x + w, page->cp[H], page->n[H] * 2 + 1);
+ bb[V][0] = get_clip_min_extent (y, page->cp[V], page->n[V] * 2 + 1);
+ bb[V][1] = get_clip_max_extent (y + h, page->cp[V], page->n[V] * 2 + 1);
+
+ render_page_draw_cells (page, bb);
+}
\f
/* Breaking up tables to fit on a page. */
b->hw = headers_width (page, axis);
}
+/* Initializes B as a render_break structure for which
+ render_break_has_next() always returns false. */
+void
+render_break_init_empty (struct render_break *b)
+{
+ b->page = NULL;
+ b->axis = TABLE_HORZ;
+ b->cell = 0;
+ b->pixel = 0;
+ b->hw = 0;
+}
+
/* Frees B and unrefs the render_page that it owns. */
void
render_break_destroy (struct render_break *b)
const struct render_page *page = b->page;
enum table_axis axis = b->axis;
- return b->cell < page->n[axis] - page->h[axis][1];
+ return page != NULL && b->cell < page->n[axis] - page->h[axis][1];
}
/* Returns the minimum SIZE argument that, if passed to render_break_next(),