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libi3: Implement Pango rendering

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This commit is contained in:
Fernando Tarlá Cardoso Lemos
2012-08-05 21:36:49 +02:00
committed by Quentin Glidic
parent f06161b58a
commit 6ff3f7abad
14 changed files with 178 additions and 16 deletions
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148
libi3/font.c
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@ -12,11 +12,118 @@
#include <stdbool.h>
#include <err.h>
#if PANGO_SUPPORT
#include <cairo/cairo-xcb.h>
#include <pango/pangocairo.h>
#endif
#include "libi3.h"
extern xcb_connection_t *conn;
extern xcb_screen_t *root_screen;
static const i3Font *savedFont = NULL;
#if PANGO_SUPPORT
static xcb_visualtype_t *root_visual_type;
static double pango_font_red;
static double pango_font_green;
static double pango_font_blue;
/*
* Loads a Pango font description into an i3Font structure. Returns true
* on success, false otherwise.
*
*/
static bool load_pango_font(i3Font *font, const char *desc) {
/* Load the font description */
font->specific.pango_desc = pango_font_description_from_string(desc);
if (!font->specific.pango_desc)
return false;
/* We cache root_visual_type here, since you must call
* load_pango_font before any other pango function
* that would need root_visual_type */
root_visual_type = get_visualtype(root_screen);
/* Create a dummy Pango layout to compute the font height */
cairo_surface_t *surface = cairo_xcb_surface_create(conn, root_screen->root, root_visual_type, 1, 1);
cairo_t *cr = cairo_create(surface);
PangoLayout *layout = pango_cairo_create_layout(cr);
pango_layout_set_font_description(layout, font->specific.pango_desc);
/* Get the font height */
gint height;
pango_layout_get_pixel_size(layout, NULL, &height);
font->height = height;
/* Free resources */
g_object_unref(layout);
cairo_destroy(cr);
cairo_surface_destroy(surface);
/* Set the font type and return successfully */
font->type = FONT_TYPE_PANGO;
return true;
}
/*
* Draws text using Pango rendering.
*
*/
static void draw_text_pango(const char *text, size_t text_len,
xcb_drawable_t drawable, int x, int y, int max_width) {
/* Create the Pango layout */
/* root_visual_type is cached in load_pango_font */
cairo_surface_t *surface = cairo_xcb_surface_create(conn, drawable,
root_visual_type, x + max_width, y + savedFont->height);
cairo_t *cr = cairo_create(surface);
PangoLayout *layout = pango_cairo_create_layout(cr);
pango_layout_set_font_description(layout, savedFont->specific.pango_desc);
pango_layout_set_width(layout, max_width * PANGO_SCALE);
pango_layout_set_wrap(layout, PANGO_WRAP_CHAR);
pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
/* Do the drawing */
cairo_set_source_rgb(cr, pango_font_red, pango_font_green, pango_font_blue);
cairo_move_to(cr, x, y);
pango_layout_set_text(layout, text, text_len);
pango_cairo_update_layout(cr, layout);
pango_cairo_show_layout(cr, layout);
/* Free resources */
g_object_unref(layout);
cairo_destroy(cr);
cairo_surface_destroy(surface);
}
/*
* Calculate the text width using Pango rendering.
*
*/
static int predict_text_width_pango(const char *text, size_t text_len) {
/* Create a dummy Pango layout */
/* root_visual_type is cached in load_pango_font */
cairo_surface_t *surface = cairo_xcb_surface_create(conn, root_screen->root, root_visual_type, 1, 1);
cairo_t *cr = cairo_create(surface);
PangoLayout *layout = pango_cairo_create_layout(cr);
/* Get the font width */
gint width;
pango_layout_set_font_description(layout, savedFont->specific.pango_desc);
pango_layout_set_text(layout, text, text_len);
pango_cairo_update_layout(cr, layout);
pango_layout_get_pixel_size(layout, &width, NULL);
/* Free resources */
g_object_unref(layout);
cairo_destroy(cr);
cairo_surface_destroy(surface);
return width;
}
#endif
/*
* Loads a font for usage, also getting its metrics. If fallback is true,
* the fonts 'fixed' or '-misc-*' will be loaded instead of exiting.
@ -26,6 +133,14 @@ i3Font load_font(const char *pattern, const bool fallback) {
i3Font font;
font.type = FONT_TYPE_NONE;
#if PANGO_SUPPORT
/* Try to load a pango font if specified */
if (strlen(pattern) > strlen("xft:") && !strncmp(pattern, "xft:", strlen("xft:"))) {
pattern += strlen("xft:");
if (load_pango_font(&font, pattern))
return font;
}
#endif
/* Send all our requests first */
font.specific.xcb.id = xcb_generate_id(conn);
@ -105,6 +220,12 @@ void free_font(void) {
free(savedFont->specific.xcb.info);
break;
}
#if PANGO_SUPPORT
case FONT_TYPE_PANGO:
/* Free the font description */
pango_font_description_free(savedFont->specific.pango_desc);
break;
#endif
default:
assert(false);
break;
@ -129,6 +250,14 @@ void set_font_colors(xcb_gcontext_t gc, uint32_t foreground, uint32_t background
xcb_change_gc(conn, gc, mask, values);
break;
}
#if PANGO_SUPPORT
case FONT_TYPE_PANGO:
/* Save the foreground font */
pango_font_red = ((foreground >> 16) & 0xff) / 255.0;
pango_font_green = ((foreground >> 8) & 0xff) / 255.0;
pango_font_blue = (foreground & 0xff) / 255.0;
break;
#endif
default:
assert(false);
break;
@ -186,6 +315,13 @@ void draw_text(i3String *text, xcb_drawable_t drawable,
draw_text_xcb(i3string_as_ucs2(text), i3string_get_num_glyphs(text),
drawable, gc, x, y, max_width);
break;
#if PANGO_SUPPORT
case FONT_TYPE_PANGO:
/* Render the text using Pango */
draw_text_pango(i3string_as_utf8(text), i3string_get_num_bytes(text),
drawable, x, y, max_width);
return;
#endif
default:
assert(false);
}
@ -219,6 +355,13 @@ void draw_text_ascii(const char *text, xcb_drawable_t drawable,
}
break;
}
#if PANGO_SUPPORT
case FONT_TYPE_PANGO:
/* Render the text using Pango */
draw_text_pango(text, strlen(text),
drawable, x, y, max_width);
return;
#endif
default:
assert(false);
}
@ -309,6 +452,11 @@ int predict_text_width(i3String *text) {
return 0;
case FONT_TYPE_XCB:
return predict_text_width_xcb(i3string_as_ucs2(text), i3string_get_num_glyphs(text));
#if PANGO_SUPPORT
case FONT_TYPE_PANGO:
/* Calculate extents using Pango */
return predict_text_width_pango(i3string_as_utf8(text), i3string_get_num_bytes(text));
#endif
default:
assert(false);
return 0;