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New front end functions to save and restore a region of the puzzle

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bitmap. Can be used to implement sprite-like animations: for
example, useful for games that wish to implement a user interface
which involves dragging an object around the playing area.

[originally from svn r5987]
This commit is contained in:
Simon Tatham
2005-06-22 08:30:31 +00:00
parent 64fbdf60ee
commit b176767dfa
4 changed files with 186 additions and 0 deletions
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51
gtk.c
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@ -334,6 +334,57 @@ void draw_polygon(frontend *fe, int *coords, int npoints,
sfree(points);
}
struct blitter {
GdkPixmap *pixmap;
int w, h, x, y;
};
blitter *blitter_new(int w, int h)
{
/*
* We can't create the pixmap right now, because fe->window
* might not yet exist. So we just cache w and h and create it
* during the firs call to blitter_save.
*/
blitter *bl = snew(blitter);
bl->pixmap = NULL;
bl->w = w;
bl->h = h;
return bl;
}
void blitter_free(blitter *bl)
{
if (bl->pixmap)
gdk_pixmap_unref(bl->pixmap);
sfree(bl);
}
void blitter_save(frontend *fe, blitter *bl, int x, int y)
{
if (!bl->pixmap)
bl->pixmap = gdk_pixmap_new(fe->area->window, bl->w, bl->h, -1);
bl->x = x;
bl->y = y;
gdk_draw_pixmap(bl->pixmap,
fe->area->style->fg_gc[GTK_WIDGET_STATE(fe->area)],
fe->pixmap,
x, y, 0, 0, bl->w, bl->h);
}
void blitter_load(frontend *fe, blitter *bl, int x, int y)
{
assert(bl->pixmap);
if (x == BLITTER_FROMSAVED && y == BLITTER_FROMSAVED) {
x = bl->x;
y = bl->y;
}
gdk_draw_pixmap(fe->pixmap,
fe->area->style->fg_gc[GTK_WIDGET_STATE(fe->area)],
bl->pixmap,
0, 0, x, y, bl->w, bl->h);
}
void draw_update(frontend *fe, int x, int y, int w, int h)
{
if (fe->bbox_l > x ) fe->bbox_l = x ;