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) 2003 Ben 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 "gettext.h" #include <X11/Xft/Xft.h> #include <glib.h> #include <string.h> #include <stdlib.h> #define ELIPSES "..." #define ELIPSES_LENGTH(font) \ (font->elipses_length + (font->shadow ? font->offset : 0)) #define OB_SHADOW "shadow" #define OB_SHADOW_OFFSET "shadowoffset" #define OB_SHADOW_ALPHA "shadowtint" FcObjectType objs[] = { { OB_SHADOW, FcTypeBool }, { OB_SHADOW_OFFSET, FcTypeInteger }, { OB_SHADOW_ALPHA, FcTypeInteger } }; static PangoContext *context; static gboolean started = FALSE; static void font_startup(void) { if (!XftInit(0)) { g_warning(_("Couldn't initialize Xft.")); exit(EXIT_FAILURE); } #ifdef USE_PANGO g_type_init(); /* these will never be freed, but we will need * them until we shut down anyway */ context = pango_xft_get_context(RrDisplay(NULL), RrScreen(NULL)); #endif /* USE_PANGO */ /* Here we are teaching xft about the shadow, shadowoffset & shadowtint */ FcNameRegisterObjectTypes(objs, (sizeof(objs) / sizeof(objs[0]))); } static void measure_font(RrFont *f) { /* xOff, yOff is the normal spacing to the next glyph. */ XGlyphInfo info; /* measure an elipses */ XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont, (FcChar8*)ELIPSES, strlen(ELIPSES), &info); f->elipses_length = (signed) info.xOff; } static RrFont *openfont(const RrInstance *inst, gchar *fontstring) { /* This function is called for each font in the theme file. */ /* It returns a pointer to a RrFont struct after filling it. */ RrFont *out; FcPattern *pat, *match; XftFont *font; FcResult res; gint tint; #ifdef USE_PANGO guchar *tmp_string = NULL; gint tmp_int; #endif /* USE_PANGO */ if (!(pat = XftNameParse(fontstring))) return NULL; match = XftFontMatch(RrDisplay(inst), RrScreen(inst), pat, &res); FcPatternDestroy(pat); if (!match) return NULL; out = g_new(RrFont, 1); out->inst = inst; #ifdef USE_PANGO /* printf("\n\n%s\n\n",fontstring); FcPatternPrint(match); */ out->pango_font_description = pango_font_description_new(); if (FcPatternGetString(match, "family", 0, &tmp_string) != FcResultTypeMismatch) { pango_font_description_set_family(out->pango_font_description, (gchar *)tmp_string); tmp_string = NULL; } if (FcPatternGetString(match, "style", 0, &tmp_string) != FcResultTypeMismatch) { /* Bold ? */ if (!strcasecmp("bold", (gchar *)tmp_string)) { pango_font_description_set_weight(out->pango_font_description, PANGO_WEIGHT_BOLD); } /* Italic ? */ else if (!strcasecmp("italic", (gchar *)tmp_string)) { pango_font_description_set_style(out->pango_font_description, PANGO_STYLE_ITALIC); } tmp_string = NULL; } if (FcPatternGetInteger(match, "pixelsize", 0, &tmp_int) != FcResultTypeMismatch) { /* TODO: is PANGO_SCALE correct ?? */ pango_font_description_set_size(out->pango_font_description, tmp_int*PANGO_SCALE); } /* based on gtkmain.c gtk_get_default_language() */ PangoLanguage *ln; gchar *locale, *p; locale = g_strdup(setlocale(LC_CTYPE, NULL)); if ((p = strchr(locale, '.'))) *p = '\0'; if ((p = strchr(locale, '@'))) *p = '\0'; printf("%s\n", locale); PangoFontMetrics *metrics = pango_context_get_metrics(context, out->pango_font_description, ln = pango_language_from_string(locale)); out->pango_ascent = pango_font_metrics_get_ascent(metrics); out->pango_descent = pango_font_metrics_get_descent(metrics); g_free(locale); pango_font_metrics_unref(metrics); #endif /* USE_PANGO */ if (FcPatternGetBool(match, OB_SHADOW, 0, &out->shadow) != FcResultMatch) out->shadow = FALSE; if (FcPatternGetInteger(match, OB_SHADOW_OFFSET, 0, &out->offset) != FcResultMatch) out->offset = 1; if (FcPatternGetInteger(match, OB_SHADOW_ALPHA, 0, &tint) != FcResultMatch) tint = 25; if (tint > 100) tint = 100; else if (tint < -100) tint = -100; out->tint = tint; font = XftFontOpenPattern(RrDisplay(inst), match); if (!font) { FcPatternDestroy(match); g_free(out); return NULL; } else out->xftfont = font; #ifdef USE_PANGO /* FcPatternDestroy(match); */ #endif /* USE_PANGO */ measure_font(out); return out; } RrFont *RrFontOpen(const RrInstance *inst, gchar *fontstring) { RrFont *out; if (!started) { font_startup(); started = TRUE; } if ((out = openfont(inst, fontstring))) return out; g_warning(_("Unable to load font: %s\n"), fontstring); g_warning(_("Trying fallback font: %s\n"), "sans"); if ((out = openfont(inst, "sans"))) return out; g_warning(_("Unable to load font: %s\n"), "sans"); return NULL; } void RrFontClose(RrFont *f) { if (f) { XftFontClose(RrDisplay(f->inst), f->xftfont); g_free(f); } #ifdef USE_PANGO pango_font_description_free(f->pango_font_description); #endif } static void font_measure_full(const RrFont *f, const gchar *str, gint *x, gint *y) { #ifdef USE_PANGO PangoLayout *pl; PangoRectangle rect; pl = pango_layout_new (context); pango_layout_set_text(pl, str, -1); pango_layout_set_font_description(pl, f->pango_font_description); pango_layout_set_single_paragraph_mode(pl, TRUE); pango_layout_get_pixel_extents(pl, NULL, &rect); *x = rect.width + (f->shadow ? ABS(f->offset) : 0); *y = rect.height + (f->shadow ? ABS(f->offset) : 0); g_object_unref(pl); #else XGlyphInfo info; XftTextExtentsUtf8(RrDisplay(f->inst), f->xftfont, (const FcChar8*)str, strlen(str), &info); *x = (signed) info.xOff + (f->shadow ? ABS(f->offset) : 0); *y = info.height + (f->shadow ? ABS(f->offset) : 0); #endif /* USE_PANGO */ } RrSize *RrFontMeasureString(const RrFont *f, const gchar *str) { RrSize *size; size = g_new(RrSize, 1); font_measure_full (f, str, &size->width, &size->height); return size; } gint RrFontHeight(const RrFont *f) { #ifdef USE_PANGO return (f->pango_ascent + f->pango_descent ) / PANGO_SCALE + (f->shadow ? f->offset : 0); #else return f->xftfont->ascent + f->xftfont->descent + (f->shadow ? f->offset : 0); #endif } gint RrFontMaxCharWidth(const RrFont *f) { return (signed) f->xftfont->max_advance_width; } #ifdef USE_PANGO 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 */ int asc = f->pango_ascent; int ascdesc = asc + f->pango_descent; int space = height * PANGO_SCALE - ascdesc; int baseline = space / 2 + asc; return baseline / PANGO_SCALE; } #endif void RrFontDraw(XftDraw *d, RrTextureText *t, RrRect *area) { gint x,y,w,h; XftColor c; GString *text; gint mw, mh; #ifndef USE_PANGO size_t l; gboolean shortened = FALSE; #else PangoLayout *pl; PangoRectangle rect; pl = pango_layout_new (context); #endif /* USE_PANGO */ /* center vertically * for xft we pass the top edge of the text for positioning... */ #ifndef USE_PANGO y = area->y + (area->height - RrFontHeight(t->font)) / 2; #else /* but for pango we pass the baseline, since different fonts have * different top edges. It looks stupid when the baseline of "normal" * text jumps up and down when a "strange" character is just added * to the end of the text */ y = area->y + font_calculate_baseline(t->font, area->height); #endif /* the +2 and -4 leave a small blank edge on the sides */ x = area->x + 2; w = area->width - 4; h = area->height; text = g_string_new(t->string); #ifndef USE_PANGO l = g_utf8_strlen(text->str, -1); font_measure_full(t->font, text->str, &mw, &mh); while (l && mw > area->width) { shortened = TRUE; /* remove a character from the middle */ text = g_string_erase(text, l-- / 2, 1); /* if the elipses are too large, don't show them at all */ if (ELIPSES_LENGTH(t->font) > area->width) shortened = FALSE; font_measure_full(t->font, text->str, &mw, &mh); mw += ELIPSES_LENGTH(t->font); } if (shortened) { text = g_string_insert(text, (l + 1) / 2, ELIPSES); l += 3; } if (!l) return; l = strlen(text->str); /* number of bytes */ #else pango_layout_set_text(pl, text->str, -1); pango_layout_set_font_description(pl, t->font->pango_font_description); pango_layout_set_single_paragraph_mode(pl, TRUE); pango_layout_set_width(pl, w * PANGO_SCALE); pango_layout_set_ellipsize(pl, PANGO_ELLIPSIZE_MIDDLE); /* This doesn't work with layout_line() of course */ /* pango_layout_set_alignment(pl, (PangoAlignment)(t->justify)); */ pango_layout_get_pixel_extents(pl, NULL, &rect); mw = rect.width; #endif /* USE_PANGO */ 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->font->shadow) { if (t->font->tint >= 0) { c.color.red = 0; c.color.green = 0; c.color.blue = 0; c.color.alpha = 0xffff * t->font->tint / 100; c.pixel = BlackPixel(RrDisplay(t->font->inst), RrScreen(t->font->inst)); } else { c.color.red = 0xffff; c.color.green = 0xffff; c.color.blue = 0xffff; c.color.alpha = 0xffff * -t->font->tint / 100; c.pixel = WhitePixel(RrDisplay(t->font->inst), RrScreen(t->font->inst)); } #ifndef USE_PANGO XftDrawStringUtf8(d, &c, t->font->xftfont, x + t->font->offset, t->font->xftfont->ascent + y + t->font->offset, (FcChar8*)text->str, l); #else /* USE_PANGO */ /* see below... */ pango_xft_render_layout_line(d, &c, pango_layout_get_line(pl, 0), (x + t->font->offset) * PANGO_SCALE, (y + t->font->offset) * PANGO_SCALE); #endif /* USE_PANGO */ } 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; #ifndef USE_PANGO XftDrawStringUtf8(d, &c, t->font->xftfont, x, t->font->xftfont->ascent + y, (FcChar8*)text->str, l); #else /* USE_PANGO */ /* This looks retarded, but layout_line() bases y on the baseline, while * layout() bases y on the top of the ink layout shit ass fucking crap. * We want the baseline to always be in the same place, thusly, we use * layout_line() * The actual line doesn't need to be freed */ pango_xft_render_layout_line(d, &c, pango_layout_get_line(pl, 0), x * PANGO_SCALE, y * PANGO_SCALE); g_object_unref(pl); #endif g_string_free(text, TRUE); return; } |