diff options
Diffstat (limited to 'gtk/layout_pango.c')
| -rw-r--r-- | gtk/layout_pango.c | 309 |
1 files changed, 0 insertions, 309 deletions
diff --git a/gtk/layout_pango.c b/gtk/layout_pango.c deleted file mode 100644 index 49b629399..000000000 --- a/gtk/layout_pango.c +++ /dev/null @@ -1,309 +0,0 @@ -/* - * Copyright 2005 James Bursa <bursa@users.sourceforge.net> - * - * This file is part of NetSurf, http://www.netsurf-browser.org/ - * - * NetSurf 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; version 2 of the License. - * - * NetSurf 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. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. - */ - -/** - * \file - * GTK implementation of layout handling using pango. - * - * Pango is used handle and render fonts. - */ - - -#include <assert.h> -#include <stdio.h> -#include <gtk/gtk.h> - -#include "utils/log.h" -#include "utils/nsoption.h" -#include "desktop/gui_layout.h" - -#include "gtk/layout_pango.h" -#include "gtk/plotters.h" - -static PangoContext *nsfont_pango_context = NULL; -static PangoLayout *nsfont_pango_layout = NULL; - -static inline void nsfont_pango_check(void) -{ - if (nsfont_pango_context == NULL) { - LOG("Creating nsfont_pango_context."); - nsfont_pango_context = gdk_pango_context_get(); - } - - if (nsfont_pango_layout == NULL) { - LOG("Creating nsfont_pango_layout."); - nsfont_pango_layout = pango_layout_new(nsfont_pango_context); - } -} - -/** - * Measure the width of a string. - * - * \param[in] fstyle plot style for this text - * \param[in] string UTF-8 string to measure - * \param[in] length length of string, in bytes - * \param[out] width updated to width of string[0..length) - * \return NSERROR_OK and width updated or appropriate error code on faliure - */ -static nserror -nsfont_width(const plot_font_style_t *fstyle, - const char *string, - size_t length, - int *width) -{ - PangoFontDescription *desc; - - if (length == 0) { - *width = 0; - return NSERROR_OK; - } - - nsfont_pango_check(); - - desc = nsfont_style_to_description(fstyle); - pango_layout_set_font_description(nsfont_pango_layout, desc); - pango_font_description_free(desc); - - pango_layout_set_text(nsfont_pango_layout, string, length); - - pango_layout_get_pixel_size(nsfont_pango_layout, width, 0); - - /* LOG("fstyle: %p string:\"%.*s\", length: %u, width: %dpx", - fstyle, length, string, length, *width); - */ - - return NSERROR_OK; -} - - -/** - * Find the position in a string where an x coordinate falls. - * - * \param[in] fstyle style for this text - * \param[in] string UTF-8 string to measure - * \param[in] length length of string, in bytes - * \param[in] x coordinate to search for - * \param[out] char_offset updated to offset in string of actual_x, [0..length] - * \param[out] actual_x updated to x coordinate of character closest to x - * \return NSERROR_OK and char_offset and actual_x updated or appropriate - * error code on faliure - */ -static nserror -nsfont_position_in_string(const plot_font_style_t *fstyle, - const char *string, - size_t length, - int x, - size_t *char_offset, - int *actual_x) -{ - int index; - PangoFontDescription *desc; - PangoRectangle pos; - - nsfont_pango_check(); - - desc = nsfont_style_to_description(fstyle); - pango_layout_set_font_description(nsfont_pango_layout, desc); - pango_font_description_free(desc); - - pango_layout_set_text(nsfont_pango_layout, string, length); - - if (pango_layout_xy_to_index(nsfont_pango_layout, - x * PANGO_SCALE, - 0, &index, 0) == FALSE) { - index = length; - } - - pango_layout_index_to_pos(nsfont_pango_layout, index, &pos); - - *char_offset = index; - *actual_x = PANGO_PIXELS(pos.x); - - return NSERROR_OK; -} - - -/** - * Find where to split a string to make it fit a width. - * - * \param[in] fstyle style for this text - * \param[in] string UTF-8 string to measure - * \param[in] length length of string, in bytes - * \param[in] x width available - * \param[out] char_offset updated to offset in string of actual_x, [1..length] - * \param[out] actual_x updated to x coordinate of character closest to x - * \return NSERROR_OK or appropriate error code on faliure - * - * On exit, char_offset indicates first character after split point. - * - * \note char_offset of 0 must never be returned. - * - * Returns: - * char_offset giving split point closest to x, where actual_x <= x - * else - * char_offset giving split point closest to x, where actual_x > x - * - * Returning char_offset == length means no split possible - */ -static nserror -nsfont_split(const plot_font_style_t *fstyle, - const char *string, - size_t length, - int x, - size_t *char_offset, - int *actual_x) -{ - int index = length; - PangoFontDescription *desc; - PangoContext *context; - PangoLayout *layout; - PangoLayoutLine *line; - - context = gdk_pango_context_get(); - layout = pango_layout_new(context); - - desc = nsfont_style_to_description(fstyle); - pango_layout_set_font_description(layout, desc); - pango_font_description_free(desc); - - pango_layout_set_text(layout, string, length); - - /* Limit width of layout to the available width */ - pango_layout_set_width(layout, x * PANGO_SCALE); - - /* Request word wrapping */ - pango_layout_set_wrap(layout, PANGO_WRAP_WORD); - - /* Prevent pango treating linebreak characters as line breaks */ - pango_layout_set_single_paragraph_mode(layout, TRUE); - - /* Obtain the second line of the layout (if there is one) */ - line = pango_layout_get_line(layout, 1); - if (line != NULL) { - /* Pango split the text. The line's start_index indicates the - * start of the character after the line break. */ - index = line->start_index; - } - - g_object_unref(layout); - g_object_unref(context); - - *char_offset = index; - /* Obtain the pixel offset of the split character */ - nsfont_width(fstyle, string, index, actual_x); - - return NSERROR_OK; -} - - -/** - * Render a string. - * - * \param x x coordinate - * \param y y coordinate - * \param string UTF-8 string to measure - * \param length length of string - * \param fstyle plot style for this text - * \return true on success, false on error and error reported - */ -bool nsfont_paint(int x, int y, const char *string, size_t length, - const plot_font_style_t *fstyle) -{ - PangoFontDescription *desc; - PangoLayout *layout; - PangoLayoutLine *line; - - if (length == 0) - return true; - - layout = pango_cairo_create_layout(current_cr); - - desc = nsfont_style_to_description(fstyle); - pango_layout_set_font_description(layout, desc); - pango_font_description_free(desc); - - pango_layout_set_text(layout, string, length); - - line = pango_layout_get_line_readonly(layout, 0); - cairo_move_to(current_cr, x, y); - nsgtk_set_colour(fstyle->foreground); - pango_cairo_show_layout_line(current_cr, line); - - g_object_unref(layout); - - return true; -} - - -/* exported interface documented in gtk/layout_pango.h */ -PangoFontDescription * -nsfont_style_to_description(const plot_font_style_t *fstyle) -{ - unsigned int size; - PangoFontDescription *desc; - PangoStyle style = PANGO_STYLE_NORMAL; - - switch (fstyle->family) { - case PLOT_FONT_FAMILY_SERIF: - desc = pango_font_description_from_string(nsoption_charp(font_serif)); - break; - case PLOT_FONT_FAMILY_MONOSPACE: - desc = pango_font_description_from_string(nsoption_charp(font_mono)); - break; - case PLOT_FONT_FAMILY_CURSIVE: - desc = pango_font_description_from_string(nsoption_charp(font_cursive)); - break; - case PLOT_FONT_FAMILY_FANTASY: - desc = pango_font_description_from_string(nsoption_charp(font_fantasy)); - break; - case PLOT_FONT_FAMILY_SANS_SERIF: - default: - desc = pango_font_description_from_string(nsoption_charp(font_sans)); - break; - } - - size = (fstyle->size * PANGO_SCALE) / FONT_SIZE_SCALE; - - if (fstyle->flags & FONTF_ITALIC) - style = PANGO_STYLE_ITALIC; - else if (fstyle->flags & FONTF_OBLIQUE) - style = PANGO_STYLE_OBLIQUE; - - pango_font_description_set_style(desc, style); - - pango_font_description_set_weight(desc, (PangoWeight) fstyle->weight); - - pango_font_description_set_size(desc, size); - - if (fstyle->flags & FONTF_SMALLCAPS) { - pango_font_description_set_variant(desc, - PANGO_VARIANT_SMALL_CAPS); - } else { - pango_font_description_set_variant(desc, PANGO_VARIANT_NORMAL); - } - - return desc; -} - -static struct gui_layout_table layout_table = { - .width = nsfont_width, - .position = nsfont_position_in_string, - .split = nsfont_split, -}; - -struct gui_layout_table *nsgtk_layout_table = &layout_table; |