render/font.c (raw)
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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_single_paragraph_mode(out->layout, TRUE); /* 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) { PangoRectangle rect; pango_layout_set_text(f->layout, str, -1); pango_layout_set_width(f->layout, -1); /* 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) { RrSize *size; size = g_new(RrSize, 1); font_measure_full(f, str, &size->width, &size->height, shadow_x, shadow_y); 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; /* 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 = area->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 - 4; h = area->height; 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); /* * * 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) { c.color.red = t->shadow_color->r | t->shadow_color->r << 8; c.color.green = t->shadow_color->g | t->shadow_color->g << 8; c.color.blue = t->shadow_color->b | t->shadow_color->b << 8; c.color.alpha = 0xffff * t->shadow_alpha / 255; c.pixel = t->shadow_color->pixel; /* see below... */ pango_xft_render_layout_line (d, &c, pango_layout_get_line(t->font->layout, 0), (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 *c = 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(c) - c); /* 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 */ pango_xft_render_layout_line (d, &c, pango_layout_get_line(t->font->layout, 0), 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); } } |