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openbox/render/font.c

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/* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
font.c for the Openbox window manager
Copyright (c) 2006 Mikael Magnusson
Copyright (c) 2003-2007 Dana Jansens
Copyright (c) 2003 Derek Foreman
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
See the COPYING file for a copy of the GNU General Public License.
*/
#include "font.h"
#include "color.h"
#include "mask.h"
#include "theme.h"
#include "geom.h"
#include "instance.h"
#include "gettext.h"
#include <glib.h>
#include <string.h>
#include <stdlib.h>
#include <locale.h>
static void measure_font(const RrInstance *inst, RrFont *f)
{
PangoFontMetrics *metrics;
static PangoLanguage *lang = NULL;
if (lang == NULL) {
#if PANGO_VERSION_MAJOR > 1 || \
(PANGO_VERSION_MAJOR == 1 && PANGO_VERSION_MINOR >= 16)
lang = pango_language_get_default();
#else
gchar *locale, *p;
/* get the default language from the locale
(based on gtk_get_default_language in gtkmain.c) */
locale = g_strdup(setlocale(LC_CTYPE, NULL));
if ((p = strchr(locale, '.'))) *p = '\0'; /* strip off the . */
if ((p = strchr(locale, '@'))) *p = '\0'; /* strip off the @ */
lang = pango_language_from_string(locale);
g_free(locale);
#endif
}
/* measure the ascent and descent */
metrics = pango_context_get_metrics(inst->pango, f->font_desc, lang);
f->ascent = pango_font_metrics_get_ascent(metrics);
f->descent = pango_font_metrics_get_descent(metrics);
pango_font_metrics_unref(metrics);
}
RrFont *RrFontOpen(const RrInstance *inst, const gchar *name, gint size,
RrFontWeight weight, RrFontSlant slant)
{
RrFont *out;
PangoWeight pweight;
PangoStyle pstyle;
PangoAttrList *attrlist;
out = g_new(RrFont, 1);
out->inst = inst;
out->ref = 1;
out->font_desc = pango_font_description_new();
out->layout = pango_layout_new(inst->pango);
out->shortcut_underline = pango_attr_underline_new(PANGO_UNDERLINE_LOW);
out->shortcut_underline->start_index = 0;
out->shortcut_underline->end_index = 0;
attrlist = pango_attr_list_new();
/* shortcut_underline is owned by the attrlist */
pango_attr_list_insert(attrlist, out->shortcut_underline);
/* the attributes are owned by the layout */
pango_layout_set_attributes(out->layout, attrlist);
pango_attr_list_unref(attrlist);
switch (weight) {
case RR_FONTWEIGHT_LIGHT: pweight = PANGO_WEIGHT_LIGHT; break;
case RR_FONTWEIGHT_NORMAL: pweight = PANGO_WEIGHT_NORMAL; break;
case RR_FONTWEIGHT_SEMIBOLD: pweight = PANGO_WEIGHT_SEMIBOLD; break;
case RR_FONTWEIGHT_BOLD: pweight = PANGO_WEIGHT_BOLD; break;
case RR_FONTWEIGHT_ULTRABOLD: pweight = PANGO_WEIGHT_ULTRABOLD; break;
default: g_assert_not_reached();
}
switch (slant) {
case RR_FONTSLANT_NORMAL: pstyle = PANGO_STYLE_NORMAL; break;
case RR_FONTSLANT_ITALIC: pstyle = PANGO_STYLE_ITALIC; break;
case RR_FONTSLANT_OBLIQUE: pstyle = PANGO_STYLE_OBLIQUE; break;
default: g_assert_not_reached();
}
/* setup the font */
pango_font_description_set_family(out->font_desc, name);
pango_font_description_set_weight(out->font_desc, pweight);
pango_font_description_set_style(out->font_desc, pstyle);
pango_font_description_set_size(out->font_desc, size * PANGO_SCALE);
/* setup the layout */
pango_layout_set_font_description(out->layout, out->font_desc);
pango_layout_set_wrap(out->layout, PANGO_WRAP_WORD_CHAR);
/* get the ascent and descent */
measure_font(inst, out);
return out;
}
RrFont *RrFontOpenDefault(const RrInstance *inst)
{
return RrFontOpen(inst, RrDefaultFontFamily, RrDefaultFontSize,
RrDefaultFontWeight, RrDefaultFontSlant);
}
void RrFontRef(RrFont *f)
{
++f->ref;
}
void RrFontClose(RrFont *f)
{
if (f) {
if (--f->ref < 1) {
g_object_unref(f->layout);
pango_font_description_free(f->font_desc);
g_free(f);
}
}
}
static void font_measure_full(const RrFont *f, const gchar *str,
gint *x, gint *y, gint shadow_x, gint shadow_y,
gboolean flow, gint maxwidth)
{
PangoRectangle rect;
pango_layout_set_text(f->layout, str, -1);
if (flow) {
pango_layout_set_single_paragraph_mode(f->layout, FALSE);
pango_layout_set_width(f->layout, maxwidth * PANGO_SCALE);
pango_layout_set_ellipsize(f->layout, PANGO_ELLIPSIZE_NONE);
}
else {
/* single line mode */
pango_layout_set_single_paragraph_mode(f->layout, TRUE);
pango_layout_set_width(f->layout, -1);
pango_layout_set_ellipsize(f->layout, PANGO_ELLIPSIZE_MIDDLE);
}
/* pango_layout_get_pixel_extents lies! this is the right way to get the
size of the text's area */
pango_layout_get_extents(f->layout, NULL, &rect);
#if PANGO_VERSION_MAJOR > 1 || \
(PANGO_VERSION_MAJOR == 1 && PANGO_VERSION_MINOR >= 16)
/* pass the logical rect as the ink rect, this is on purpose so we get the
full area for the text */
pango_extents_to_pixels(&rect, NULL);
#else
rect.width = (rect.width + PANGO_SCALE - 1) / PANGO_SCALE;
rect.height = (rect.height + PANGO_SCALE - 1) / PANGO_SCALE;
#endif
*x = rect.width + ABS(shadow_x) + 4 /* we put a 2 px edge on each side */;
*y = rect.height + ABS(shadow_y);
}
RrSize *RrFontMeasureString(const RrFont *f, const gchar *str,
gint shadow_x, gint shadow_y,
gboolean flow, gint maxwidth)
{
RrSize *size;
g_assert(!flow || maxwidth > 0);
size = g_new(RrSize, 1);
font_measure_full(f, str, &size->width, &size->height, shadow_x, shadow_y,
flow, maxwidth);
return size;
}
gint RrFontHeight(const RrFont *f, gint shadow_y)
{
return (f->ascent + f->descent) / PANGO_SCALE + ABS(shadow_y);
}
static inline int font_calculate_baseline(RrFont *f, gint height)
{
/* For my own reference:
* _________
* ^space/2 ^height ^baseline
* v_________|_ |
* | ^ascent | _ _
* | | | | |_ _____ _| |_ _ _
* | | | | _/ -_) \ / _| || |
* | v_________v \__\___/_\_\\__|\_, |
* | ^descent |__/
* __________|_v
* ^space/2 |
* V_________v
*/
return (((height * PANGO_SCALE) /* height of the space in pango units */
- (f->ascent + f->descent)) /* minus space taken up by text */
/ 2 /* divided by two -> half of the empty space (this is the top
of the text) */
+ f->ascent) /* now move down to the baseline */
/ PANGO_SCALE; /* back to pixels */
}
void RrFontDraw(XftDraw *d, RrTextureText *t, RrRect *area)
{
gint x,y,w,h;
XftColor c;
gint mw;
PangoRectangle rect;
PangoAttrList *attrlist;
PangoEllipsizeMode ell;
g_assert(!t->flow || t->maxwidth > 0);
y = area->y;
if (!t->flow)
/* center the text vertically
We do this centering based on the 'baseline' since different fonts
have different top edges. It looks bad when the whole string is
moved when 1 character from a non-default language is included in
the string */
y += font_calculate_baseline(t->font, area->height);
/* the +2 and -4 leave a small blank edge on the sides */
x = area->x + 2;
w = area->width;
if (t->flow) w = MAX(w, t->maxwidth);
w -= 4;
h = area->height;
if (t->flow)
ell = PANGO_ELLIPSIZE_NONE;
else {
switch (t->ellipsize) {
case RR_ELLIPSIZE_NONE:
ell = PANGO_ELLIPSIZE_NONE;
break;
case RR_ELLIPSIZE_START:
ell = PANGO_ELLIPSIZE_START;
break;
case RR_ELLIPSIZE_MIDDLE:
ell = PANGO_ELLIPSIZE_MIDDLE;
break;
case RR_ELLIPSIZE_END:
ell = PANGO_ELLIPSIZE_END;
break;
}
}
pango_layout_set_text(t->font->layout, t->string, -1);
pango_layout_set_width(t->font->layout, w * PANGO_SCALE);
pango_layout_set_ellipsize(t->font->layout, ell);
pango_layout_set_single_paragraph_mode(t->font->layout, !t->flow);
/* * * end of setting up the layout * * */
pango_layout_get_pixel_extents(t->font->layout, NULL, &rect);
mw = rect.width;
/* pango_layout_set_alignment doesn't work with
pango_xft_render_layout_line */
switch (t->justify) {
case RR_JUSTIFY_LEFT:
break;
case RR_JUSTIFY_RIGHT:
x += (w - mw);
break;
case RR_JUSTIFY_CENTER:
x += (w - mw) / 2;
break;
}
if (t->shadow_offset_x || t->shadow_offset_y) {
/* From nvidia's readme (chapter 23):
When rendering to a 32-bit window, keep in mind that the X RENDER
extension, used by most composite managers, expects "premultiplied
alpha" colors. This means that if your color has components (r,g,b)
and alpha value a, then you must render (a*r, a*g, a*b, a) into the
target window.
*/
c.color.red = (t->shadow_color->r | t->shadow_color->r << 8) *
t->shadow_alpha / 255;
c.color.green = (t->shadow_color->g | t->shadow_color->g << 8) *
t->shadow_alpha / 255;
c.color.blue = (t->shadow_color->b | t->shadow_color->b << 8) *
t->shadow_alpha / 255;
c.color.alpha = 0xffff * t->shadow_alpha / 255;
c.pixel = t->shadow_color->pixel;
/* see below... */
if (!t->flow) {
pango_xft_render_layout_line
(d, &c,
#if PANGO_VERSION_MAJOR > 1 || \
(PANGO_VERSION_MAJOR == 1 && PANGO_VERSION_MINOR >= 16)
pango_layout_get_line_readonly(t->font->layout, 0),
#else
pango_layout_get_line(t->font->layout, 0),
#endif
(x + t->shadow_offset_x) * PANGO_SCALE,
(y + t->shadow_offset_y) * PANGO_SCALE);
}
else {
pango_xft_render_layout(d, &c, t->font->layout,
(x + t->shadow_offset_x) * PANGO_SCALE,
(y + t->shadow_offset_y) * PANGO_SCALE);
}
}
c.color.red = t->color->r | t->color->r << 8;
c.color.green = t->color->g | t->color->g << 8;
c.color.blue = t->color->b | t->color->b << 8;
c.color.alpha = 0xff | 0xff << 8; /* fully opaque text */
c.pixel = t->color->pixel;
if (t->shortcut) {
const gchar *s = t->string + t->shortcut_pos;
t->font->shortcut_underline->start_index = t->shortcut_pos;
t->font->shortcut_underline->end_index = t->shortcut_pos +
(g_utf8_next_char(s) - s);
/* the attributes are owned by the layout.
re-add the attributes to the layout after changing the
start and end index */
attrlist = pango_layout_get_attributes(t->font->layout);
pango_attr_list_ref(attrlist);
pango_layout_set_attributes(t->font->layout, attrlist);
pango_attr_list_unref(attrlist);
}
/* layout_line() uses y to specify the baseline
The line doesn't need to be freed, it's a part of the layout */
if (!t->flow) {
pango_xft_render_layout_line
(d, &c,
#if PANGO_VERSION_MAJOR > 1 || \
(PANGO_VERSION_MAJOR == 1 && PANGO_VERSION_MINOR >= 16)
pango_layout_get_line_readonly(t->font->layout, 0),
#else
pango_layout_get_line(t->font->layout, 0),
#endif
x * PANGO_SCALE,
y * PANGO_SCALE);
}
else {
pango_xft_render_layout(d, &c, t->font->layout,
x * PANGO_SCALE,
y * PANGO_SCALE);
}
if (t->shortcut) {
t->font->shortcut_underline->start_index = 0;
t->font->shortcut_underline->end_index = 0;
/* the attributes are owned by the layout.
re-add the attributes to the layout after changing the
start and end index */
attrlist = pango_layout_get_attributes(t->font->layout);
pango_attr_list_ref(attrlist);
pango_layout_set_attributes(t->font->layout, attrlist);
pango_attr_list_unref(attrlist);
}
}
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