* vim:ts=4:sw=4:expandtab
*
* i3 - an improved dynamic tiling window manager
- * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
+ * © 2009-2013 Michael Stapelberg and contributors (see also: LICENSE)
*
*/
#include <assert.h>
#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;
+
+/* Necessary to track whether the dpi changes and trigger a LOG() message,
+ * which is more easily visible to users. */
+static double logged_dpi = 0.0;
+
+static PangoLayout *create_layout_with_dpi(cairo_t *cr) {
+ PangoLayout *layout;
+ PangoContext *context;
+
+ context = pango_cairo_create_context(cr);
+ const double dpi = (double)root_screen->height_in_pixels * 25.4 /
+ (double)root_screen->height_in_millimeters;
+ if (logged_dpi != dpi) {
+ logged_dpi = dpi;
+ LOG("X11 root window dictates %f DPI\n", dpi);
+ } else {
+ DLOG("X11 root window dictates %f DPI\n", dpi);
+ }
+ pango_cairo_context_set_resolution(context, dpi);
+ layout = pango_layout_new(context);
+ g_object_unref(context);
+
+ return layout;
+}
+
+/*
+ * 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) {
+ ELOG("Could not open font %s with Pango, fallback to X font.\n", desc);
+ return false;
+ }
+
+ LOG("Using Pango font %s, size %d\n",
+ pango_font_description_get_family(font->specific.pango_desc),
+ pango_font_description_get_size(font->specific.pango_desc) / PANGO_SCALE);
+
+ /* 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 = create_layout_with_dpi(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, bool is_markup) {
+ /* 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 = create_layout_with_dpi(cr);
+ gint height;
+
+ 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);
+
+ if (is_markup)
+ pango_layout_set_markup(layout, text, text_len);
+ else
+ pango_layout_set_text(layout, text, text_len);
+
+ /* Do the drawing */
+ cairo_set_source_rgb(cr, pango_font_red, pango_font_green, pango_font_blue);
+ pango_cairo_update_layout(cr, layout);
+ pango_layout_get_pixel_size(layout, NULL, &height);
+ /* Center the piece of text vertically if its height is smaller than the
+ * cached font height, and just let "high" symbols fall out otherwise. */
+ int yoffset = (height < savedFont->height ? 0.5 : 1) * (height - savedFont->height);
+ cairo_move_to(cr, x, y - yoffset);
+ 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, bool is_markup) {
+ /* 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 = create_layout_with_dpi(cr);
+
+ /* Get the font width */
+ gint width;
+ pango_layout_set_font_description(layout, savedFont->specific.pango_desc);
+
+ if (is_markup)
+ pango_layout_set_markup(layout, text, text_len);
+ else
+ 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.
+ * the fonts 'fixed' or '-misc-*' will be loaded instead of exiting. If any
+ * font was previously loaded, it will be freed.
*
*/
i3Font load_font(const char *pattern, const bool fallback) {
+ /* if any font was previously loaded, free it now */
+ free_font();
+
i3Font font;
+ font.type = FONT_TYPE_NONE;
+
+ /* No XCB connction, return early because we're just validating the
+ * configuration file. */
+ if (conn == NULL) {
+ return font;
+ }
+
+#if PANGO_SUPPORT
+ /* Try to load a pango font if specified */
+ if (strlen(pattern) > strlen("pango:") && !strncmp(pattern, "pango:", strlen("pango:"))) {
+ const char *font_pattern = pattern + strlen("pango:");
+ if (load_pango_font(&font, font_pattern)) {
+ font.pattern = sstrdup(pattern);
+ return font;
+ }
+ } else if (strlen(pattern) > strlen("xft:") && !strncmp(pattern, "xft:", strlen("xft:"))) {
+ const char *font_pattern = pattern + strlen("xft:");
+ if (load_pango_font(&font, font_pattern)) {
+ font.pattern = sstrdup(pattern);
+ return font;
+ }
+ }
+#endif
/* Send all our requests first */
- font.id = xcb_generate_id(conn);
- xcb_void_cookie_t font_cookie = xcb_open_font_checked(conn, font.id,
- strlen(pattern), pattern);
- xcb_query_font_cookie_t info_cookie = xcb_query_font(conn, font.id);
+ font.specific.xcb.id = xcb_generate_id(conn);
+ xcb_void_cookie_t font_cookie = xcb_open_font_checked(conn, font.specific.xcb.id,
+ strlen(pattern), pattern);
+ xcb_query_font_cookie_t info_cookie = xcb_query_font(conn, font.specific.xcb.id);
/* Check for errors. If errors, fall back to default font. */
xcb_generic_error_t *error;
ELOG("Could not open font %s (X error %d). Trying fallback to 'fixed'.\n",
pattern, error->error_code);
pattern = "fixed";
- font_cookie = xcb_open_font_checked(conn, font.id, strlen(pattern), pattern);
- info_cookie = xcb_query_font(conn, font.id);
+ font_cookie = xcb_open_font_checked(conn, font.specific.xcb.id,
+ strlen(pattern), pattern);
+ info_cookie = xcb_query_font(conn, font.specific.xcb.id);
/* Check if we managed to open 'fixed' */
error = xcb_request_check(conn, font_cookie);
if (error != NULL) {
ELOG("Could not open fallback font 'fixed', trying with '-misc-*'.\n");
pattern = "-misc-*";
- font_cookie = xcb_open_font_checked(conn, font.id, strlen(pattern), pattern);
- info_cookie = xcb_query_font(conn, font.id);
+ font_cookie = xcb_open_font_checked(conn, font.specific.xcb.id,
+ strlen(pattern), pattern);
+ info_cookie = xcb_query_font(conn, font.specific.xcb.id);
if ((error = xcb_request_check(conn, font_cookie)) != NULL)
errx(EXIT_FAILURE, "Could open neither requested font nor fallbacks "
- "(fixed or -misc-*): X11 error %d", error->error_code);
+ "(fixed or -misc-*): X11 error %d",
+ error->error_code);
}
}
+ font.pattern = sstrdup(pattern);
+ LOG("Using X font %s\n", pattern);
+
/* Get information (height/name) for this font */
- if (!(font.info = xcb_query_font_reply(conn, info_cookie, NULL)))
+ if (!(font.specific.xcb.info = xcb_query_font_reply(conn, info_cookie, NULL)))
errx(EXIT_FAILURE, "Could not load font \"%s\"", pattern);
/* Get the font table, if possible */
- if (xcb_query_font_char_infos_length(font.info) == 0)
- font.table = NULL;
+ if (xcb_query_font_char_infos_length(font.specific.xcb.info) == 0)
+ font.specific.xcb.table = NULL;
else
- font.table = xcb_query_font_char_infos(font.info);
+ font.specific.xcb.table = xcb_query_font_char_infos(font.specific.xcb.info);
/* Calculate the font height */
- font.height = font.info->font_ascent + font.info->font_descent;
+ font.height = font.specific.xcb.info->font_ascent + font.specific.xcb.info->font_descent;
+ /* Set the font type and return successfully */
+ font.type = FONT_TYPE_XCB;
return font;
}
}
/*
- * Frees the resources taken by the current font.
+ * Frees the resources taken by the current font. If no font was previously
+ * loaded, it simply returns.
*
*/
void free_font(void) {
- /* Close the font and free the info */
- xcb_close_font(conn, savedFont->id);
- if (savedFont->info)
- free(savedFont->info);
+ /* if there is no saved font, simply return */
+ if (savedFont == NULL)
+ return;
+
+ free(savedFont->pattern);
+ switch (savedFont->type) {
+ case FONT_TYPE_NONE:
+ /* Nothing to do */
+ break;
+ case FONT_TYPE_XCB: {
+ /* Close the font and free the info */
+ xcb_close_font(conn, savedFont->specific.xcb.id);
+ if (savedFont->specific.xcb.info)
+ 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;
+ }
+
+ savedFont = NULL;
}
/*
*/
void set_font_colors(xcb_gcontext_t gc, uint32_t foreground, uint32_t background) {
assert(savedFont != NULL);
- uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND | XCB_GC_FONT;
- uint32_t values[] = { foreground, background, savedFont->id };
- xcb_change_gc(conn, gc, mask, values);
+
+ switch (savedFont->type) {
+ case FONT_TYPE_NONE:
+ /* Nothing to do */
+ break;
+ case FONT_TYPE_XCB: {
+ /* Change the font and colors in the GC */
+ uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND | XCB_GC_FONT;
+ uint32_t values[] = {foreground, background, savedFont->specific.xcb.id};
+ 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;
+ }
}
-/*
- * Draws text onto the specified X drawable (normally a pixmap) at the
- * specified coordinates (from the top left corner of the leftmost, uppermost
- * glyph) and using the provided gc.
- *
- * Text can be specified as UCS-2 or UTF-8. If it's specified as UCS-2, then
- * text_len must be the number of glyphs in the string. If it's specified as
- * UTF-8, then text_len must be the number of bytes in the string (not counting
- * the null terminator).
- *
- */
-void draw_text(char *text, size_t text_len, bool is_ucs2, xcb_drawable_t drawable,
- xcb_gcontext_t gc, int x, int y, int max_width) {
- assert(savedFont != NULL);
- assert(text_len != 0);
+static int predict_text_width_xcb(const xcb_char2b_t *text, size_t text_len);
+static void draw_text_xcb(const xcb_char2b_t *text, size_t text_len, xcb_drawable_t drawable,
+ xcb_gcontext_t gc, int x, int y, int max_width) {
/* X11 coordinates for fonts start at the baseline */
- int pos_y = y + savedFont->info->font_ascent;
-
- /* As an optimization, check if we can bypass conversion */
- if (!is_ucs2 && text_len <= 255) {
- xcb_image_text_8(conn, text_len, drawable, gc, x, pos_y, text);
- return;
- }
-
- /* Convert the text into UCS-2 so we can do basic pointer math */
- char *input = (is_ucs2 ? text : (char*)convert_utf8_to_ucs2(text, &text_len));
+ int pos_y = y + savedFont->specific.xcb.info->font_ascent;
/* The X11 protocol limits text drawing to 255 chars, so we may need
* multiple calls */
- int pos_x = x;
int offset = 0;
for (;;) {
/* Calculate the size of this chunk */
int chunk_size = (text_len > 255 ? 255 : text_len);
- xcb_char2b_t *chunk = (xcb_char2b_t*)input + offset;
+ const xcb_char2b_t *chunk = text + offset;
/* Draw it */
- xcb_image_text_16(conn, chunk_size, drawable, gc, pos_x, pos_y, chunk);
+ xcb_image_text_16(conn, chunk_size, drawable, gc, x, pos_y, chunk);
/* Advance the offset and length of the text to draw */
offset += chunk_size;
break;
/* Advance pos_x based on the predicted text width */
- pos_x += predict_text_width((char*)chunk, chunk_size, true);
+ x += predict_text_width_xcb(chunk, chunk_size);
+ }
+}
+
+/*
+ * Draws text onto the specified X drawable (normally a pixmap) at the
+ * specified coordinates (from the top left corner of the leftmost, uppermost
+ * glyph) and using the provided gc.
+ *
+ * Text must be specified as an i3String.
+ *
+ */
+void draw_text(i3String *text, xcb_drawable_t drawable,
+ xcb_gcontext_t gc, int x, int y, int max_width) {
+ assert(savedFont != NULL);
+
+ switch (savedFont->type) {
+ case FONT_TYPE_NONE:
+ /* Nothing to do */
+ return;
+ case FONT_TYPE_XCB:
+ 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, i3string_is_markup(text));
+ return;
+#endif
+ default:
+ assert(false);
}
+}
- /* If we had to convert, free the converted string */
- if (!is_ucs2)
- free(input);
+/*
+ * ASCII version of draw_text to print static strings.
+ *
+ */
+void draw_text_ascii(const char *text, xcb_drawable_t drawable,
+ xcb_gcontext_t gc, int x, int y, int max_width) {
+ assert(savedFont != NULL);
+
+ switch (savedFont->type) {
+ case FONT_TYPE_NONE:
+ /* Nothing to do */
+ return;
+ case FONT_TYPE_XCB: {
+ size_t text_len = strlen(text);
+ if (text_len > 255) {
+ /* The text is too long to draw it directly to X */
+ i3String *str = i3string_from_utf8(text);
+ draw_text(str, drawable, gc, x, y, max_width);
+ i3string_free(str);
+ } else {
+ /* X11 coordinates for fonts start at the baseline */
+ int pos_y = y + savedFont->specific.xcb.info->font_ascent;
+
+ xcb_image_text_8(conn, text_len, drawable, gc, x, pos_y, text);
+ }
+ break;
+ }
+#if PANGO_SUPPORT
+ case FONT_TYPE_PANGO:
+ /* Render the text using Pango */
+ draw_text_pango(text, strlen(text),
+ drawable, x, y, max_width, false);
+ return;
+#endif
+ default:
+ assert(false);
+ }
}
-static int xcb_query_text_width(xcb_char2b_t *text, size_t text_len) {
+static int xcb_query_text_width(const xcb_char2b_t *text, size_t text_len) {
/* Make the user know we’re using the slow path, but only once. */
static bool first_invocation = true;
if (first_invocation) {
/* Query the text width */
xcb_generic_error_t *error;
xcb_query_text_extents_cookie_t cookie = xcb_query_text_extents(conn,
- savedFont->id, text_len, (xcb_char2b_t*)text);
+ savedFont->specific.xcb.id, text_len, (xcb_char2b_t *)text);
xcb_query_text_extents_reply_t *reply = xcb_query_text_extents_reply(conn,
- cookie, &error);
+ cookie, &error);
if (reply == NULL) {
/* We return a safe estimate because a rendering error is better than
- * a crash. Plus, the user will see the error in his log. */
+ * a crash. Plus, the user will see the error in their log. */
fprintf(stderr, "Could not get text extents (X error code %d)\n",
error->error_code);
- return savedFont->info->max_bounds.character_width * text_len;
+ return savedFont->specific.xcb.info->max_bounds.character_width * text_len;
}
int width = reply->overall_width;
return width;
}
-/*
- * Predict the text width in pixels for the given text. Text can be specified
- * as UCS-2 or UTF-8.
- *
- */
-int predict_text_width(char *text, size_t text_len, bool is_ucs2) {
- /* Convert the text into UTF-16 so we can do basic pointer math */
- xcb_char2b_t *input;
- if (is_ucs2)
- input = (xcb_char2b_t*)text;
- else
- input = convert_utf8_to_ucs2(text, &text_len);
+static int predict_text_width_xcb(const xcb_char2b_t *input, size_t text_len) {
+ if (text_len == 0)
+ return 0;
int width;
- if (savedFont->table == NULL) {
+ if (savedFont->specific.xcb.table == NULL) {
/* If we don't have a font table, fall back to querying the server */
width = xcb_query_text_width(input, text_len);
} else {
/* Save some pointers for convenience */
- xcb_query_font_reply_t *font_info = savedFont->info;
- xcb_charinfo_t *font_table = savedFont->table;
+ xcb_query_font_reply_t *font_info = savedFont->specific.xcb.info;
+ xcb_charinfo_t *font_table = savedFont->specific.xcb.table;
/* Calculate the width using the font table */
width = 0;
/* Don't you ask me, how this one works… (Merovius) */
info = &font_table[((row - font_info->min_byte1) *
- (font_info->max_char_or_byte2 - font_info->min_char_or_byte2 + 1)) +
- (col - font_info->min_char_or_byte2)];
+ (font_info->max_char_or_byte2 - font_info->min_char_or_byte2 + 1)) +
+ (col - font_info->min_char_or_byte2)];
if (info->character_width != 0 ||
- (info->right_side_bearing |
- info->left_side_bearing |
- info->ascent |
- info->descent) != 0) {
+ (info->right_side_bearing |
+ info->left_side_bearing |
+ info->ascent |
+ info->descent) != 0) {
width += info->character_width;
}
}
}
- /* If we had to convert, free the converted string */
- if (!is_ucs2)
- free(input);
-
return width;
}
+
+/*
+ * Predict the text width in pixels for the given text. Text must be
+ * specified as an i3String.
+ *
+ */
+int predict_text_width(i3String *text) {
+ assert(savedFont != NULL);
+
+ switch (savedFont->type) {
+ case FONT_TYPE_NONE:
+ /* Nothing to do */
+ 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),
+ i3string_is_markup(text));
+#endif
+ default:
+ assert(false);
+ return 0;
+ }
+}
projects / i3 / i3 / blobdiff