mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-12-05 12:21:57 +03:00
310 lines
8.2 KiB
C
310 lines
8.2 KiB
C
/*
|
|
* 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 "netsurf/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;
|