libui/_wip/attrstr_metrics/unix_OLD__old_drawtext.c

218 lines
5.6 KiB
C

// 6 september 2015
#include "uipriv_unix.h"
#include "draw.h"
struct uiDrawFontFamilies {
PangoFontFamily **f;
int n;
};
uiDrawFontFamilies *uiDrawListFontFamilies(void)
{
uiDrawFontFamilies *ff;
PangoFontMap *map;
ff = uiNew(uiDrawFontFamilies);
map = pango_cairo_font_map_get_default();
pango_font_map_list_families(map, &(ff->f), &(ff->n));
// do not free map; it's a shared resource
return ff;
}
int uiDrawFontFamiliesNumFamilies(uiDrawFontFamilies *ff)
{
return ff->n;
}
char *uiDrawFontFamiliesFamily(uiDrawFontFamilies *ff, int n)
{
PangoFontFamily *f;
f = ff->f[n];
return uiUnixStrdupText(pango_font_family_get_name(f));
}
void uiDrawFreeFontFamilies(uiDrawFontFamilies *ff)
{
g_free(ff->f);
uiFree(ff);
}
struct uiDrawTextFont {
PangoFont *f;
};
uiDrawTextFont *mkTextFont(PangoFont *f, gboolean ref)
{
uiDrawTextFont *font;
font = uiNew(uiDrawTextFont);
font->f = f;
if (ref)
g_object_ref(font->f);
return font;
}
PangoFont *pangoDescToPangoFont(PangoFontDescription *pdesc)
{
PangoFont *f;
PangoContext *context;
// in this case, the context is necessary for the metrics to be correct
context = mkGenericPangoCairoContext();
f = pango_font_map_load_font(pango_cairo_font_map_get_default(), context, pdesc);
if (f == NULL) {
// LONGTERM
g_error("[libui] no match in pangoDescToPangoFont(); report to andlabs");
}
g_object_unref(context);
return f;
}
uiDrawTextFont *uiDrawLoadClosestFont(const uiDrawTextFontDescriptor *desc)
{
PangoFont *f;
PangoFontDescription *pdesc;
pdesc = pango_font_description_new();
pango_font_description_set_family(pdesc,
desc->Family);
pango_font_description_set_size(pdesc,
(gint) (desc->Size * PANGO_SCALE));
pango_font_description_set_weight(pdesc,
pangoWeights[desc->Weight]);
pango_font_description_set_style(pdesc,
pangoItalics[desc->Italic]);
pango_font_description_set_stretch(pdesc,
pangoStretches[desc->Stretch]);
f = pangoDescToPangoFont(pdesc);
pango_font_description_free(pdesc);
return mkTextFont(f, FALSE); // we hold the initial reference; no need to ref
}
void uiDrawFreeTextFont(uiDrawTextFont *font)
{
g_object_unref(font->f);
uiFree(font);
}
uintptr_t uiDrawTextFontHandle(uiDrawTextFont *font)
{
return (uintptr_t) (font->f);
}
void uiDrawTextFontDescribe(uiDrawTextFont *font, uiDrawTextFontDescriptor *desc)
{
PangoFontDescription *pdesc;
// this creates a copy; we free it later
pdesc = pango_font_describe(font->f);
// TODO
pango_font_description_free(pdesc);
}
// See https://developer.gnome.org/pango/1.30/pango-Cairo-Rendering.html#pango-Cairo-Rendering.description
// Note that we convert to double before dividing to make sure the floating-point stuff is right
#define pangoToCairo(pango) (((double) (pango)) / PANGO_SCALE)
#define cairoToPango(cairo) ((gint) ((cairo) * PANGO_SCALE))
void uiDrawTextFontGetMetrics(uiDrawTextFont *font, uiDrawTextFontMetrics *metrics)
{
PangoFontMetrics *pm;
pm = pango_font_get_metrics(font->f, NULL);
metrics->Ascent = pangoToCairo(pango_font_metrics_get_ascent(pm));
metrics->Descent = pangoToCairo(pango_font_metrics_get_descent(pm));
// Pango doesn't seem to expose this :( Use 0 and hope for the best.
metrics->Leading = 0;
metrics->UnderlinePos = pangoToCairo(pango_font_metrics_get_underline_position(pm));
metrics->UnderlineThickness = pangoToCairo(pango_font_metrics_get_underline_thickness(pm));
pango_font_metrics_unref(pm);
}
// note: PangoCairoLayouts are tied to a given cairo_t, so we can't store one in this device-independent structure
struct uiDrawTextLayout {
char *s;
ptrdiff_t *graphemes;
PangoFont *defaultFont;
double width;
PangoAttrList *attrs;
};
uiDrawTextLayout *uiDrawNewTextLayout(const char *text, uiDrawTextFont *defaultFont, double width)
{
uiDrawTextLayout *layout;
PangoContext *context;
layout = uiNew(uiDrawTextLayout);
layout->s = g_strdup(text);
context = mkGenericPangoCairoContext();
layout->graphemes = graphemes(layout->s, context);
g_object_unref(context);
layout->defaultFont = defaultFont->f;
g_object_ref(layout->defaultFont); // retain a copy
uiDrawTextLayoutSetWidth(layout, width);
layout->attrs = pango_attr_list_new();
return layout;
}
void uiDrawFreeTextLayout(uiDrawTextLayout *layout)
{
pango_attr_list_unref(layout->attrs);
g_object_unref(layout->defaultFont);
uiFree(layout->graphemes);
g_free(layout->s);
uiFree(layout);
}
void uiDrawTextLayoutSetWidth(uiDrawTextLayout *layout, double width)
{
layout->width = width;
}
static void prepareLayout(uiDrawTextLayout *layout, PangoLayout *pl)
{
// again, this makes a copy
desc = pango_font_describe(layout->defaultFont);
pango_layout_set_attributes(pl, layout->attrs);
}
void uiDrawText(uiDrawContext *c, double x, double y, uiDrawTextLayout *layout)
{
PangoLayout *pl;
pl = pango_cairo_create_layout(c->cr);
}
static void addAttr(uiDrawTextLayout *layout, PangoAttribute *attr, int startChar, int endChar)
{
attr->start_index = layout->graphemes[startChar];
attr->end_index = layout->graphemes[endChar];
pango_attr_list_insert(layout->attrs, attr);
// pango_attr_list_insert() takes attr; we don't free it
}
void uiDrawTextLayoutSetColor(uiDrawTextLayout *layout, int startChar, int endChar, double r, double g, double b, double a)
{
PangoAttribute *attr;
guint16 rr, gg, bb, aa;
rr = (guint16) (r * 65535);
gg = (guint16) (g * 65535);
bb = (guint16) (b * 65535);
aa = (guint16) (a * 65535);
attr = pango_attr_foreground_new(rr, gg, bb);
addAttr(layout, attr, startChar, endChar);
// TODO what if aa == 0?
attr = FUTURE_pango_attr_foreground_alpha_new(aa);
if (attr != NULL)
addAttr(layout, attr, startChar, endChar);
}