311 lines
8.3 KiB
C
311 lines
8.3 KiB
C
/*
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* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* \file
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* GTK implementation of layout handling using pango.
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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 "utils/log.h"
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#include "utils/nsoption.h"
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#include "netsurf/layout.h"
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#include "netsurf/plot_style.h"
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#include "gtk/layout_pango.h"
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#include "gtk/plotters.h"
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static PangoContext *nsfont_pango_context = NULL;
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static PangoLayout *nsfont_pango_layout = NULL;
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static inline void nsfont_pango_check(void)
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{
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if (nsfont_pango_context == NULL) {
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LOG("Creating nsfont_pango_context.");
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nsfont_pango_context = gdk_pango_context_get();
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}
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if (nsfont_pango_layout == NULL) {
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LOG("Creating nsfont_pango_layout.");
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nsfont_pango_layout = pango_layout_new(nsfont_pango_context);
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}
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}
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/**
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* Measure the width of a string.
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*
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* \param[in] fstyle plot style for this text
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* \param[in] string UTF-8 string to measure
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* \param[in] length length of string, in bytes
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* \param[out] width updated to width of string[0..length)
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* \return NSERROR_OK and width updated or appropriate error code on faliure
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*/
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static nserror
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nsfont_width(const plot_font_style_t *fstyle,
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const char *string,
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size_t length,
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int *width)
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{
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PangoFontDescription *desc;
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if (length == 0) {
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*width = 0;
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return NSERROR_OK;
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}
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nsfont_pango_check();
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desc = nsfont_style_to_description(fstyle);
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pango_layout_set_font_description(nsfont_pango_layout, desc);
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pango_font_description_free(desc);
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pango_layout_set_text(nsfont_pango_layout, string, length);
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pango_layout_get_pixel_size(nsfont_pango_layout, width, 0);
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/* LOG("fstyle: %p string:\"%.*s\", length: %u, width: %dpx",
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fstyle, length, string, length, *width);
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*/
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return NSERROR_OK;
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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[in] fstyle style for this text
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* \param[in] string UTF-8 string to measure
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* \param[in] length length of string, in bytes
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* \param[in] x coordinate to search for
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* \param[out] char_offset updated to offset in string of actual_x, [0..length]
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* \param[out] actual_x updated to x coordinate of character closest to x
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* \return NSERROR_OK and char_offset and actual_x updated or appropriate
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* error code on faliure
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*/
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static nserror
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nsfont_position_in_string(const plot_font_style_t *fstyle,
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const char *string,
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size_t length,
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int x,
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size_t *char_offset,
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int *actual_x)
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{
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int index;
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PangoFontDescription *desc;
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PangoRectangle pos;
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nsfont_pango_check();
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desc = nsfont_style_to_description(fstyle);
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pango_layout_set_font_description(nsfont_pango_layout, desc);
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pango_font_description_free(desc);
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pango_layout_set_text(nsfont_pango_layout, string, length);
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if (pango_layout_xy_to_index(nsfont_pango_layout,
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x * PANGO_SCALE,
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0, &index, 0) == FALSE) {
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index = length;
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}
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pango_layout_index_to_pos(nsfont_pango_layout, index, &pos);
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*char_offset = index;
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*actual_x = PANGO_PIXELS(pos.x);
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return NSERROR_OK;
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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[in] fstyle style for this text
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* \param[in] string UTF-8 string to measure
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* \param[in] length length of string, in bytes
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* \param[in] x width available
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* \param[out] char_offset updated to offset in string of actual_x, [1..length]
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* \param[out] actual_x updated to x coordinate of character closest to x
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* \return NSERROR_OK or appropriate error code on faliure
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*
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* On exit, char_offset indicates first character after split point.
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*
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* \note char_offset of 0 must never be returned.
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*
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* Returns:
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* char_offset giving split point closest to x, where actual_x <= x
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* else
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* char_offset giving split point closest to x, where actual_x > x
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*
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* Returning char_offset == length means no split possible
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*/
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static nserror
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nsfont_split(const plot_font_style_t *fstyle,
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const char *string,
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size_t length,
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int x,
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size_t *char_offset,
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int *actual_x)
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{
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int index = length;
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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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context = gdk_pango_context_get();
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layout = pango_layout_new(context);
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desc = nsfont_style_to_description(fstyle);
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pango_layout_set_font_description(layout, desc);
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pango_font_description_free(desc);
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pango_layout_set_text(layout, string, length);
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/* Limit width of layout to the available width */
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pango_layout_set_width(layout, x * PANGO_SCALE);
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/* Request word wrapping */
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pango_layout_set_wrap(layout, PANGO_WRAP_WORD);
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/* Prevent pango treating linebreak characters as line breaks */
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pango_layout_set_single_paragraph_mode(layout, TRUE);
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/* Obtain the second line of the layout (if there is one) */
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line = pango_layout_get_line(layout, 1);
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if (line != NULL) {
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/* Pango split the text. The line's start_index indicates the
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* start of the character after the line break. */
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index = line->start_index;
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}
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g_object_unref(layout);
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g_object_unref(context);
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*char_offset = index;
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/* Obtain the pixel offset of the split character */
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nsfont_width(fstyle, string, index, actual_x);
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return NSERROR_OK;
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}
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/**
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* Render a string.
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*
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* \param x x coordinate
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* \param y y coordinate
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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 fstyle plot style for this 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(int x, int y, const char *string, size_t length,
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const plot_font_style_t *fstyle)
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{
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PangoFontDescription *desc;
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PangoLayout *layout;
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PangoLayoutLine *line;
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if (length == 0)
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return true;
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layout = pango_cairo_create_layout(current_cr);
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desc = nsfont_style_to_description(fstyle);
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pango_layout_set_font_description(layout, desc);
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pango_font_description_free(desc);
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pango_layout_set_text(layout, string, length);
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line = pango_layout_get_line_readonly(layout, 0);
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cairo_move_to(current_cr, x, y);
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nsgtk_set_colour(fstyle->foreground);
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pango_cairo_show_layout_line(current_cr, line);
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g_object_unref(layout);
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return true;
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}
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/* exported interface documented in gtk/layout_pango.h */
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PangoFontDescription *
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nsfont_style_to_description(const plot_font_style_t *fstyle)
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{
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unsigned int size;
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PangoFontDescription *desc;
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PangoStyle style = PANGO_STYLE_NORMAL;
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switch (fstyle->family) {
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case PLOT_FONT_FAMILY_SERIF:
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desc = pango_font_description_from_string(nsoption_charp(font_serif));
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break;
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case PLOT_FONT_FAMILY_MONOSPACE:
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desc = pango_font_description_from_string(nsoption_charp(font_mono));
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break;
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case PLOT_FONT_FAMILY_CURSIVE:
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desc = pango_font_description_from_string(nsoption_charp(font_cursive));
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break;
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case PLOT_FONT_FAMILY_FANTASY:
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desc = pango_font_description_from_string(nsoption_charp(font_fantasy));
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break;
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case PLOT_FONT_FAMILY_SANS_SERIF:
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default:
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desc = pango_font_description_from_string(nsoption_charp(font_sans));
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break;
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}
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size = (fstyle->size * PANGO_SCALE) / FONT_SIZE_SCALE;
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if (fstyle->flags & FONTF_ITALIC)
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style = PANGO_STYLE_ITALIC;
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else if (fstyle->flags & FONTF_OBLIQUE)
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style = PANGO_STYLE_OBLIQUE;
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pango_font_description_set_style(desc, style);
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pango_font_description_set_weight(desc, (PangoWeight) fstyle->weight);
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pango_font_description_set_size(desc, size);
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if (fstyle->flags & FONTF_SMALLCAPS) {
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pango_font_description_set_variant(desc,
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PANGO_VARIANT_SMALL_CAPS);
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} else {
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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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static struct gui_layout_table layout_table = {
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.width = nsfont_width,
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.position = nsfont_position_in_string,
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.split = nsfont_split,
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};
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struct gui_layout_table *nsgtk_layout_table = &layout_table;
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