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eeshow/gui/over.c (overlay_size, _all): calculate height and width of overlay
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@ -222,6 +222,81 @@ void overlay_draw_all(struct overlay *overlays, cairo_t *cr, int x, int y)
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}
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/* ----- Sizing ------------------------------------------------------------ */
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void overlay_size(const struct overlay *over, PangoContext *pango_context,
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int *w, int *h)
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{
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const struct overlay_style *style = &over->style;
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PangoLayout *layout;
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PangoFontDescription *desc;
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PangoRectangle ink_rect;
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unsigned ink_w, ink_h; /* effectively used text area size */
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/*
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* Note that we need the caller to provide the Cairo context, because
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* the font size changes subtly even between image (which we could
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* create locally) and screen (which is better left to the outside
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* world).
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*/
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desc = pango_font_description_from_string(style->font);
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layout = pango_layout_new(pango_context);
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pango_layout_set_font_description(layout, desc);
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pango_layout_set_markup(layout, over->s, -1);
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pango_font_description_free(desc);
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pango_layout_get_extents(layout, &ink_rect, NULL);
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g_object_unref(layout);
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ink_w = ink_rect.width / PANGO_SCALE;
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ink_h = ink_rect.height / PANGO_SCALE;
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ink_w = ink_w > style->wmin ? ink_w : style->wmin;
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ink_w = !style->wmax || ink_w < style->wmax ? ink_w : style->wmax;
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ink_h = ink_h > style->hmin ? ink_h : style->hmin;
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ink_h = !style->hmax || ink_h < style->hmax ? ink_h : style->hmax;
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if (w)
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*w = ink_w + 2 * over->style.pad;
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if (h)
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*h = ink_h + 2 * over->style.pad;
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}
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void overlay_size_all(const struct overlay *overlays,
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PangoContext *pango_context, bool dx, bool dy, int *w, int *h)
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{
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const struct overlay *over;
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int w1, h1;
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if (w)
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*w = 0;
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if (h)
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*h = 0;
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for (over = overlays; over; over = over->next) {
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int skip = over == overlays ? 0 : over->style.skip;
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overlay_size(over, pango_context, &w1, &h1);
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if (w) {
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if (dx)
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*w += w1 + skip;
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else
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*w = *w > w1 ? *w : w1;
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}
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if (h) {
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if (dy)
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*h += h1 + skip;
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else
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*h = *h > h1 ? *h : h1;
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}
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}
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}
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/* ----- Creation ---------------------------------------------------------- */
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@ -17,6 +17,8 @@
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#include <stdint.h>
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#include <cairo/cairo.h>
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#include <pango/pangocairo.h>
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#include "gui/aoi.h"
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@ -46,11 +48,18 @@ void overlay_draw_all_d(struct overlay *overlays, cairo_t *cr,
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unsigned x, unsigned y, int dx, int dy);
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void overlay_draw_all(struct overlay *overlays, cairo_t *cr, int x, int y);
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void overlay_size(const struct overlay *over, PangoContext *pango_context,
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int *w, int *h);
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void overlay_size_all(const struct overlay *overlays,
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PangoContext *pango_context, bool dx, bool dy, int *w, int *h);
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struct overlay *overlay_add(struct overlay **overlays, struct aoi **aois,
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bool (*hover)(void *user, bool on), void (*click)(void *user), void *user);
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void overlay_text_raw(struct overlay *over, const char *s);
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void overlay_text(struct overlay *over, const char *fmt, ...);
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void overlay_style(struct overlay *over, const struct overlay_style *style);
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void overlay_remove(struct overlay **overlays, struct overlay *over);
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void overlay_remove_all(struct overlay **overlays);
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