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Code

eeshow/gui/over.c, over.h: support icon overlays

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This commit is contained in:
Werner Almesberger 2016-08-21 01:24:42 -03:00
parent 3affbc3c3c
commit 5a7d37ce73
2 changed files with 110 additions and 7 deletions
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116
eeshow/gui/over.c
View File

@ -40,6 +40,8 @@
struct overlay {
const char *s;
cairo_surface_t *icon;
struct overlay_style style;
struct aoi **aois;
@ -54,7 +56,7 @@ struct overlay {
};
/* ----- Drawing core ------------------------------------------------------ */
/* ----- Drawing helper functions ------------------------------------------ */
static void rrect(cairo_t *cr, double x, double y, double w, double h, int r)
@ -118,7 +120,10 @@ static void post_aoi(struct overlay *over, int x, int y, unsigned w, unsigned h)
}
static unsigned overlay_draw(struct overlay *over, cairo_t *cr,
/* ----- Drawing text ------------------------------------------------------ */
static unsigned overlay_draw_text(struct overlay *over, cairo_t *cr,
int x, int y, int dx, int dy)
{
const struct overlay_style *style = &over->style;
@ -199,9 +204,60 @@ fprintf(stderr, "%u(%d) %u %.60s\n", ty, ink_rect.y / PANGO_SCALE, ink_h, over->
}
/* ----- Drawing an icon --------------------------------------------------- */
static unsigned overlay_draw_icon(struct overlay *over, cairo_t *cr,
int x, int y, int dx, int dy)
{
const struct overlay_style *style = &over->style;
unsigned iw, ih; /* icon size */
unsigned w, h; /* box size */
int ix, iy; /* icon start position */
iw = cairo_image_surface_get_width(over->icon);
iw = iw > style->wmin ? iw : style->wmin;
iw = !style->wmax || iw < style->wmax ? iw : style->wmax;
ih = cairo_image_surface_get_height(over->icon);
ih = ih > style->hmin ? ih : style->hmin;
ih = !style->hmax || ih < style->hmax ? ih : style->hmax;
w = iw + 2 * style->pad;
h = ih + 2 * style->pad;
if (dx < 0)
x -= w;
if (dy < 0)
y -= h;
ix = x + style->pad;
iy = y + style->pad;
background(over, cr, x, y, w, h);
cairo_set_source_surface(cr, over->icon, ix, iy);
cairo_paint(cr);
post_aoi(over, x, y, w, h);
return h;
}
/* ----- Drawing interfaces ------------------------------------------------ */
static unsigned overlay_draw(struct overlay *over, cairo_t *cr,
int x, int y, int dx, int dy)
{
if (over->s)
return overlay_draw_text(over, cr, x, y, dx, dy);
else
return overlay_draw_icon(over, cr, x, y, dx, dy);
}
void overlay_draw_all_d(struct overlay *overlays, cairo_t *cr,
int x, int y, int dx, int dy)
{
@ -249,11 +305,11 @@ void overlay_draw_all(struct overlay *overlays, cairo_t *cr, int x, int y)
}
/* ----- Sizing ------------------------------------------------------------ */
/* ----- Sizing text ------------------------------------------------------- */
void overlay_size(const struct overlay *over, PangoContext *pango_context,
int *w, int *h)
static void overlay_size_text(const struct overlay *over,
PangoContext *pango_context, int *w, int *h)
{
const struct overlay_style *style = &over->style;
PangoLayout *layout;
@ -287,9 +343,45 @@ void overlay_size(const struct overlay *over, PangoContext *pango_context,
ink_h = !style->hmax || ink_h < style->hmax ? ink_h : style->hmax;
if (w)
*w = ink_w + 2 * over->style.pad;
*w = ink_w + 2 * style->pad;
if (h)
*h = ink_h + 2 * over->style.pad;
*h = ink_h + 2 * style->pad;
}
/* ----- Sizing icons ------------------------------------------------------ */
static void overlay_size_icon(const struct overlay *over, int *w, int *h)
{
const struct overlay_style *style = &over->style;
unsigned iw, ih; /* effectively used icon size */
iw = cairo_image_surface_get_width(over->icon);
iw = iw > style->wmin ? iw : style->wmin;
iw = !style->wmax || iw < style->wmax ? iw : style->wmax;
ih = cairo_image_surface_get_height(over->icon);
ih = ih > style->hmin ? ih : style->hmin;
ih = !style->hmax || ih < style->hmax ? ih : style->hmax;
if (w)
*w = iw + 2 * style->pad;
if (h)
*h = ih + 2 * style->pad;
}
/* ----- Sizing ------------------------------------------------------------ */
void overlay_size(const struct overlay *over, PangoContext *pango_context,
int *w, int *h)
{
if (over->s)
overlay_size_text(over, pango_context, w, h);
else
overlay_size_icon(over, w, h);
}
@ -335,6 +427,7 @@ struct overlay *overlay_add(struct overlay **overlays, struct aoi **aois,
over = alloc_type(struct overlay);
over->s = NULL;
over->icon = NULL;
over->style = overlay_style_default;
over->aois = aois;
@ -381,6 +474,13 @@ void overlay_text(struct overlay *over, const char *fmt, ...)
}
void overlay_icon(struct overlay *over, cairo_surface_t *icon)
{
assert(!over->s);
over->icon = cairo_surface_reference(icon);
}
/* ----- Nesting ----------------------------------------------------------- */
@ -414,6 +514,8 @@ static void overlay_free(struct overlay *over)
if (over->aoi)
aoi_remove(over->aois, over->aoi);
free((void *) over->s);
if (!over->s)
cairo_surface_destroy(over->icon);
free(over);
}

1
eeshow/gui/over.h
View File

@ -58,6 +58,7 @@ struct overlay *overlay_add(struct overlay **overlays, struct aoi **aois,
void overlay_text_raw(struct overlay *over, const char *s);
void overlay_text(struct overlay *over, const char *fmt, ...);
void overlay_icon(struct overlay *over, cairo_surface_t *icon);
void overlay_style(struct overlay *over, const struct overlay_style *style);
void overlay_set_related(struct overlay *over, struct overlay *related);