mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-11-24 07:19:37 +03:00
335 lines
8.8 KiB
C
335 lines
8.8 KiB
C
/*
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* This file is part of NetSurf, http://netsurf.sourceforge.net/
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* Licensed under the GNU General Public License,
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* http://www.opensource.org/licenses/gpl-license
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* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
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*/
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/** \file
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* Font handling (GTK implementation).
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*
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* Pango is used handle and render fonts.
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <gtk/gtk.h>
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#include "netsurf/css/css.h"
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#include "netsurf/gtk/font_pango.h"
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#include "netsurf/gtk/gtk_window.h"
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#include "netsurf/render/font.h"
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#include "netsurf/utils/utils.h"
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#include "netsurf/utils/log.h"
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#include "netsurf/desktop/options.h"
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/* Until we can consider the descenders etc, we need to not render using cairo */
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#undef CAIRO_VERSION
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static PangoFontDescription *nsfont_style_to_description(
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const struct css_style *style);
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/**
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* Measure the width of a string.
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*
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* \param style css_style for this text, with style->font_size.size ==
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* CSS_FONT_SIZE_LENGTH
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* \param string UTF-8 string to measure
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* \param length length of string
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* \param width updated to width of string[0..length)
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* \return true on success, false on error and error reported
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*/
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bool nsfont_width(const struct css_style *style,
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const char *string, size_t length,
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int *width)
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{
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PangoFontDescription *desc;
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PangoContext *context;
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PangoLayout *layout;
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if (length == 0) {
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*width = 0;
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return true;
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}
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desc = nsfont_style_to_description(style);
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context = gdk_pango_context_get();
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layout = pango_layout_new(context);
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pango_layout_set_font_description(layout, desc);
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pango_layout_set_text(layout, string, length);
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pango_layout_get_pixel_size(layout, width, 0);
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g_object_unref(layout);
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g_object_unref(context);
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pango_font_description_free(desc);
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return true;
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}
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/**
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* Find the position in a string where an x coordinate falls.
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*
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* \param style css_style for this text, with style->font_size.size ==
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* CSS_FONT_SIZE_LENGTH
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* \param string UTF-8 string to measure
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* \param length length of string
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* \param x x coordinate to search for
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* \param char_offset updated to offset in string of actual_x, [0..length]
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* \param actual_x updated to x coordinate of character closest to x
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* \return true on success, false on error and error reported
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*/
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bool nsfont_position_in_string(const struct css_style *style,
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const char *string, size_t length,
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int x, size_t *char_offset, int *actual_x)
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{
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int index;
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PangoFontDescription *desc;
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PangoContext *context;
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PangoLayout *layout;
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PangoRectangle pos;
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desc = nsfont_style_to_description(style);
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context = gdk_pango_context_get();
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layout = pango_layout_new(context);
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pango_layout_set_font_description(layout, desc);
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pango_layout_set_text(layout, string, length);
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pango_layout_xy_to_index(layout, x * PANGO_SCALE, 0, &index, 0);
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pango_layout_index_to_pos(layout, index, &pos);
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g_object_unref(layout);
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g_object_unref(context);
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pango_font_description_free(desc);
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*char_offset = index?index+1:0;
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*actual_x = PANGO_PIXELS(pos.x);
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return true;
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}
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/**
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* Find where to split a string to make it fit a width.
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*
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* \param style css_style for this text, with style->font_size.size ==
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* CSS_FONT_SIZE_LENGTH
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* \param string UTF-8 string to measure
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* \param length length of string
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* \param x width available
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* \param char_offset updated to offset in string of actual_x, [0..length]
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* \param actual_x updated to x coordinate of character closest to x
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* \return true on success, false on error and error reported
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*
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* On exit, [char_offset == 0 ||
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* string[char_offset] == ' ' ||
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* char_offset == length]
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*/
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bool nsfont_split(const struct css_style *style,
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const char *string, size_t length,
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int x, size_t *char_offset, int *actual_x)
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{
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int index = length;
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int x_pos;
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PangoFontDescription *desc;
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PangoContext *context;
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PangoLayout *layout;
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PangoLayoutLine *line;
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desc = nsfont_style_to_description(style);
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context = gdk_pango_context_get();
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layout = pango_layout_new(context);
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pango_layout_set_font_description(layout, desc);
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pango_layout_set_text(layout, string, length);
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pango_layout_set_width(layout, x * PANGO_SCALE);
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pango_layout_set_wrap(layout, PANGO_WRAP_WORD);
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line = pango_layout_get_line(layout, 1);
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if (line)
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index = line->start_index - 1;
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pango_layout_line_index_to_x(pango_layout_get_line(layout, 0),
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index, 0, &x_pos);
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g_object_unref(layout);
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g_object_unref(context);
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pango_font_description_free(desc);
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*char_offset = index;
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*actual_x = PANGO_PIXELS(x_pos);
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return true;
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}
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/**
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* Render a string.
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*
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* \param style css_style for this text, with style->font_size.size ==
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* CSS_FONT_SIZE_LENGTH
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* \param string UTF-8 string to measure
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* \param length length of string
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* \param x x coordinate
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* \param y y coordinate
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* \param c colour for text
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* \return true on success, false on error and error reported
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*/
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bool nsfont_paint(const struct css_style *style,
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const char *string, size_t length,
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int x, int y, colour c)
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{
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PangoFontDescription *desc;
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PangoLayout *layout;
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gint size;
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#ifdef CAIRO_VERSION
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int width, height;
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#else
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PangoLayoutLine *line;
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PangoContext *context;
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GdkColor colour = { 0,
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((c & 0xff) << 8) | (c & 0xff),
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(c & 0xff00) | (c & 0xff00 >> 8),
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((c & 0xff0000) >> 8) | (c & 0xff0000 >> 16) };
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#endif
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if (length == 0)
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return true;
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desc = nsfont_style_to_description(style);
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size = (gint)((double)pango_font_description_get_size(desc) * nsgtk_plot_get_scale());
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if (pango_font_description_get_size_is_absolute(desc))
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pango_font_description_set_absolute_size(desc, size);
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else
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pango_font_description_set_size(desc, size);
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#ifdef CAIRO_VERSION
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layout = pango_cairo_create_layout(current_cr);
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#else
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context = gdk_pango_context_get();
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layout = pango_layout_new(context);
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#endif
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pango_layout_set_font_description(layout, desc);
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pango_layout_set_text(layout, string, length);
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#ifdef CAIRO_VERSION
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pango_layout_get_pixel_size(layout, &width, &height);
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cairo_move_to(current_cr, x, y - height);
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nsgtk_set_colour(c);
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pango_cairo_show_layout(current_cr, layout);
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#else
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line = pango_layout_get_line(layout, 0);
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gdk_draw_layout_line_with_colors(current_drawable, current_gc,
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x, y, line, &colour, 0);
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g_object_unref(context);
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#endif
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g_object_unref(layout);
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pango_font_description_free(desc);
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return true;
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}
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/**
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* Convert a css_style to a PangoFontDescription.
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*
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* \param style css_style for this text, with style->font_size.size ==
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* CSS_FONT_SIZE_LENGTH
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* \return a new Pango font description
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*/
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PangoFontDescription *nsfont_style_to_description(
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const struct css_style *style)
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{
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unsigned int size;
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PangoFontDescription *desc;
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PangoWeight weight = PANGO_WEIGHT_NORMAL;
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PangoStyle styl = PANGO_STYLE_NORMAL;
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assert(style->font_size.size == CSS_FONT_SIZE_LENGTH);
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switch (style->font_family) {
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case CSS_FONT_FAMILY_SERIF:
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desc = pango_font_description_from_string(option_font_serif);
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break;
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case CSS_FONT_FAMILY_MONOSPACE:
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desc = pango_font_description_from_string(option_font_mono);
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break;
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case CSS_FONT_FAMILY_CURSIVE:
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desc = pango_font_description_from_string(option_font_cursive);
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break;
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case CSS_FONT_FAMILY_FANTASY:
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desc = pango_font_description_from_string(option_font_fantasy);
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break;
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case CSS_FONT_FAMILY_SANS_SERIF:
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default:
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desc = pango_font_description_from_string(option_font_sans);
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break;
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}
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if (style->font_size.value.length.unit == CSS_UNIT_PX)
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size = style->font_size.value.length.value;
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else
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size = css_len2pt(&style->font_size.value.length, style);
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if (size < abs(option_font_min_size / 10))
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size = option_font_min_size / 10;
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size *= PANGO_SCALE;
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switch (style->font_style) {
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case CSS_FONT_STYLE_ITALIC:
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styl = PANGO_STYLE_ITALIC;
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break;
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case CSS_FONT_STYLE_OBLIQUE:
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styl = PANGO_STYLE_OBLIQUE;
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break;
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default:
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break;
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}
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pango_font_description_set_style(desc, styl);
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switch (style->font_weight) {
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case CSS_FONT_WEIGHT_NORMAL:
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weight = PANGO_WEIGHT_NORMAL; break;
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case CSS_FONT_WEIGHT_BOLD:
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weight = PANGO_WEIGHT_BOLD; break;
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case CSS_FONT_WEIGHT_100: weight = 100; break;
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case CSS_FONT_WEIGHT_200: weight = 200; break;
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case CSS_FONT_WEIGHT_300: weight = 300; break;
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case CSS_FONT_WEIGHT_400: weight = 400; break;
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case CSS_FONT_WEIGHT_500: weight = 500; break;
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case CSS_FONT_WEIGHT_600: weight = 600; break;
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case CSS_FONT_WEIGHT_700: weight = 700; break;
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case CSS_FONT_WEIGHT_800: weight = 800; break;
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case CSS_FONT_WEIGHT_900: weight = 900; break;
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default: break;
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}
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pango_font_description_set_weight(desc, weight);
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if (style->font_size.value.length.unit == CSS_UNIT_PX)
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pango_font_description_set_absolute_size(desc, size);
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else
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pango_font_description_set_size(desc, size);
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switch (style->font_variant) {
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case CSS_FONT_VARIANT_SMALL_CAPS:
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pango_font_description_set_variant(desc, PANGO_VARIANT_SMALL_CAPS);
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break;
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case CSS_FONT_VARIANT_NORMAL:
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default:
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pango_font_description_set_variant(desc, PANGO_VARIANT_NORMAL);
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}
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return desc;
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}
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