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app: add an infrastructure that allows to stroke multiple items at once

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In order to avoid visually overlapping lines:

- GimpCanvasItem got a "suspend_stroking" API that allows to skip
  stroking and instead starts a new sub-path
- GimpCanvasGroup got a "group_stroking" API that sets suspend_stroking
  on all its children and does one stroke after calling all items'
  draw().
This commit is contained in:
Michael Natterer
2010-09-26 14:12:54 +02:00
parent ea5190e630
commit e6ce564de4
4 changed files with 125 additions and 28 deletions
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51
app/display/gimpcanvasitem.c
View File

@ -37,6 +37,7 @@ typedef struct _GimpCanvasItemPrivate GimpCanvasItemPrivate;
struct _GimpCanvasItemPrivate
{
gboolean highlight;
gint suspend_stroking;
};
#define GET_PRIVATE(item) \
@ -122,15 +123,43 @@ void
gimp_canvas_item_set_highlight (GimpCanvasItem *item,
gboolean highlight)
{
GimpCanvasItemPrivate *private = GET_PRIVATE (item);
GimpCanvasItemPrivate *private;
g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
private = GET_PRIVATE (item);
private->highlight = highlight ? TRUE : FALSE;
}
void
gimp_canvas_item_suspend_stroking (GimpCanvasItem *item)
{
GimpCanvasItemPrivate *private;
/* protexted functions */
g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
private = GET_PRIVATE (item);
private->suspend_stroking++;
}
void
gimp_canvas_item_resume_stroking (GimpCanvasItem *item)
{
GimpCanvasItemPrivate *private;
g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
private = GET_PRIVATE (item);
g_return_if_fail (private->suspend_stroking > 0);
private->suspend_stroking--;
}
/* protected functions */
void
_gimp_canvas_item_stroke (GimpCanvasItem *item,
@ -139,11 +168,18 @@ _gimp_canvas_item_stroke (GimpCanvasItem *item,
{
GimpCanvasItemPrivate *private = GET_PRIVATE (item);
gimp_display_shell_set_tool_bg_style (shell, cr);
cairo_stroke_preserve (cr);
if (private->suspend_stroking == 0)
{
gimp_display_shell_set_tool_bg_style (shell, cr);
cairo_stroke_preserve (cr);
gimp_display_shell_set_tool_fg_style (shell, cr, private->highlight);
cairo_stroke (cr);
gimp_display_shell_set_tool_fg_style (shell, cr, private->highlight);
cairo_stroke (cr);
}
else
{
cairo_new_sub_path (cr);
}
}
void
@ -153,6 +189,9 @@ _gimp_canvas_item_fill (GimpCanvasItem *item,
{
GimpCanvasItemPrivate *private = GET_PRIVATE (item);
if (private->suspend_stroking > 0)
g_warning ("_gimp_canvas_item_fill() on an item that is in a stroking group");
gimp_display_shell_set_tool_bg_style (shell, cr);
cairo_set_line_width (cr, 2.0);
cairo_stroke_preserve (cr);