mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-12-26 22:09:43 +03:00
b0fa2b299d
Notes on a plot_path implementation. svn path=/trunk/netsurf/; revision=4292
558 lines
14 KiB
C++
558 lines
14 KiB
C++
/*
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* Copyright 2008 François Revol <mmu_man@users.sourceforge.net>
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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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/** \file
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* Font handling (BeOS implementation).
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* TODO: check for correctness, the code is taken from the GTK one.
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* maybe use the current view instead of constructing a new BFont each time ?
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*/
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#include <stdbool.h>
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#include <assert.h>
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#include <stdio.h>
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#include <Font.h>
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#include <String.h>
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#include <View.h>
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extern "C" {
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#include "css/css.h"
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#include "render/font.h"
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#include "utils/utils.h"
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#include "utils/log.h"
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#include "desktop/options.h"
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}
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#include "beos/beos_gui.h"
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#include "beos/beos_font.h"
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#include "beos/beos_plotters.h"
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static void nsfont_style_to_font(BFont &font,
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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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//fprintf(stderr, "%s(, '%s', %d, )\n", __FUNCTION__, string, length);
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BFont font;
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#if 0 /* GTK */
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PangoContext *context;
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PangoLayout *layout;
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#endif
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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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nsfont_style_to_font(font, style);
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*width = (int)font.StringWidth(string, length);
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return true;
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#if 0 /* GTK */
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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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#endif
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return true;
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}
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static int utf8_char_len(const char *c)
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{
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uint8 *p = (uint8 *)c;
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uint8 m = 0xE0;
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uint8 v = 0xC0;
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int i;
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if (!*p)
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return 0;
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if ((*p & 0x80) == 0)
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return 1;
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if ((*p & 0xC0) == 0x80)
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return 1; // actually one of the remaining bytes...
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for (i = 2; i < 5; i++) {
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if ((*p & m) == v)
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return i;
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v = (v >> 1) | 0x80;
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m = (m >> 1) | 0x80;
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}
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return i;
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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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//LOG(("(, '%s', %d, %d, , )", string, length, x));
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//fprintf(stderr, "%s(, '%s', %d, %d, , )\n", __FUNCTION__, string, length, x);
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int index;
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BFont font;
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#if 0 /* GTK */
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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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#endif
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nsfont_style_to_font(font, style);
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BString str(string);
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int32 len = str.CountChars();
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float escapements[len];
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float esc = 0.0;
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float current = 0.0;
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int i;
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index = 0;
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font.GetEscapements(string, len, escapements);
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// slow but it should work
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for (i = 0; string[index] && i < len; i++) {
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if (x < current)
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break;
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esc += escapements[i];
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current = font.Size() * esc;
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index += utf8_char_len(&string[index]);
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}
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*actual_x = (int)current;
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*char_offset = i; //index;
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#if 0 /* GTK */
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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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if (pango_layout_xy_to_index(layout, x * PANGO_SCALE,
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0, &index, 0) == 0)
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index = length;
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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;
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*actual_x = PANGO_PIXELS(pos.x);
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#endif
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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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//fprintf(stderr, "%s(, '%s', %d, %d, , )\n", __FUNCTION__, string, length, x);
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//LOG(("(, '%s', %d, %d, , )", string, length, x));
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int index = 0;
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BFont font;
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#if 0 /* GTK */
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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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PangoLayoutIter *iter;
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PangoRectangle rect;
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#endif
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nsfont_style_to_font(font, style);
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BString str(string);
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int32 len = str.CountChars();
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float escapements[len];
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float esc = 0.0;
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float current = 0.0;
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float last_x = 0.0;
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int i;
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int last_space = 0;
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font.GetEscapements(string, len, escapements);
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// slow but it should work
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for (i = 0; string[index] && i < len; i++) {
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if (string[index] == ' ') {
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last_x = current;
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last_space = index;
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}
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if (x < current) {
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*actual_x = (int)last_x;
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*char_offset = last_space;
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return true;
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}
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esc += escapements[i];
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current = font.Size() * esc;
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index += utf8_char_len(&string[index]);
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}
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*actual_x = MIN(*actual_x, (int)current);
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*char_offset = index;
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return true;
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#if 0 /* GTK */
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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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iter = pango_layout_get_iter(layout);
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pango_layout_iter_get_line_extents(iter, NULL, &rect);
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pango_layout_iter_free(iter);
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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(rect.width);
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#endif
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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 bg, colour c)
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{
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//fprintf(stderr, "%s(, '%s', %d, %d, %d, )\n", __FUNCTION__, string, length, x, y);
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//CALLED();
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BFont font;
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rgb_color oldbg;
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rgb_color background;
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rgb_color foreground;
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BView *view;
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float size;
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if (length == 0)
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return true;
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nsfont_style_to_font(font, style);
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background = nsbeos_rgb_colour(bg);
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foreground = nsbeos_rgb_colour(c);
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view = nsbeos_current_gc/*_lock*/();
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if (view == NULL) {
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warn_user("No GC", 0);
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return false;
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}
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oldbg = view->LowColor();
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drawing_mode oldmode = view->DrawingMode();
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#if 0
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if (oldbg != background)
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view->SetLowColor(background);
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#endif
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view->SetLowColor(B_TRANSPARENT_32_BIT);
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//view->SetScale() XXX
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//printf("nsfont_paint: Size: %f\n", font.Size());
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size = (float)(font.Size() * nsbeos_plot_get_scale());
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#warning XXX use scale
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view->SetFont(&font);
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view->SetHighColor(foreground);
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view->SetDrawingMode(B_OP_OVER);
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BString line(string, length);
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BPoint where(x, y + 1);
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view->DrawString(line.String(), where);
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view->SetDrawingMode(oldmode);
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if (oldbg != background)
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view->SetLowColor(oldbg);
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//nsbeos_current_gc_unlock();
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#if 0 /* GTK */
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size = (float)((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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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_font(font, 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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#endif
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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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static void nsfont_style_to_font(BFont &font,
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const struct css_style *style)
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{
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float size;
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uint16 face = 0;
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const char *family;
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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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family = option_font_serif;
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break;
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case CSS_FONT_FAMILY_MONOSPACE:
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family = option_font_mono;
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break;
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case CSS_FONT_FAMILY_CURSIVE:
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family = option_font_cursive;
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break;
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case CSS_FONT_FAMILY_FANTASY:
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family = 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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family = option_font_sans;
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break;
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}
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switch (style->font_style) {
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case CSS_FONT_STYLE_ITALIC:
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face = B_ITALIC_FACE;
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break;
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case CSS_FONT_STYLE_OBLIQUE:
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face = B_ITALIC_FACE;
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// XXX: no OBLIQUE flag ??
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// maybe find "Oblique" style
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// or use SetShear() ?
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break;
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default:
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break;
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}
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switch (style->font_weight) {
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case CSS_FONT_WEIGHT_NORMAL:
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break;
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case CSS_FONT_WEIGHT_BOLD:
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case CSS_FONT_WEIGHT_600:
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case CSS_FONT_WEIGHT_700:
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#ifndef __HAIKU__XXX
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case CSS_FONT_WEIGHT_800:
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case CSS_FONT_WEIGHT_900:
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#endif
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face |= B_BOLD_FACE; break;
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#ifdef __HAIKU__XXX
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case CSS_FONT_WEIGHT_BOLDER:
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case CSS_FONT_WEIGHT_800:
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case CSS_FONT_WEIGHT_900:
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face |= B_HEAVY_FACE; break;
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case CSS_FONT_WEIGHT_100:
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case CSS_FONT_WEIGHT_200:
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case CSS_FONT_WEIGHT_300:
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case CSS_FONT_WEIGHT_LIGHTER:
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face |= B_LIGHT_FACE; break;
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#endif
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/*
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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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*/
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default: break;
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}
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if (!face)
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face = B_REGULAR_FACE;
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//fprintf(stderr, "nsfont_style_to_font: %d, %d, %d -> '%s' %04x\n", style->font_family, style->font_style, style->font_weight, family, face);
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if (family)
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font.SetFamilyAndFace((const font_family)family, face);
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else {
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//XXX not used
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font = be_plain_font;
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font.SetFace(face);
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}
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#if 0
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*font_size = css_len2px(&style->font_size.value.length, style) *
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72.0 / 90.0 * 16.;
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if (*font_size < option_font_min_size * 1.6)
|
|
*font_size = option_font_min_size * 1.6;
|
|
if (1600 < *font_size)
|
|
*font_size = 1600;
|
|
#endif
|
|
|
|
#if 0 /* GTK */
|
|
if (style->font_size.value.length.unit == CSS_UNIT_PX)
|
|
size = style->font_size.value.length.value;
|
|
else
|
|
size = css_len2pt(&style->font_size.value.length, style);
|
|
//XXX ?
|
|
if (style->font_size.value.length.unit == CSS_UNIT_PX)
|
|
font.SetSize(size);
|
|
else
|
|
font.SetSize(font.Size() + size);
|
|
#endif
|
|
|
|
//fprintf(stderr, "nsfont_style_to_font: value %f unit %d\n", style->font_size.value.length.value, style->font_size.value.length.unit);
|
|
if (style->font_size.value.length.unit == CSS_UNIT_PT)
|
|
size = style->font_size.value.length.value;
|
|
else
|
|
size = css_len2pt(&style->font_size.value.length, style);
|
|
// * 72.0 / 90.0;
|
|
|
|
//XXX: pango stuff ?
|
|
if (size < abs(option_font_min_size / 10))
|
|
size = option_font_min_size / 10;
|
|
|
|
//fprintf(stderr, "nsfont_style_to_font: %f %d\n", size, style->font_size.value.length.unit);
|
|
|
|
font.SetSize(size);
|
|
|
|
|
|
#if 0 /* GTK */
|
|
switch (style->font_variant) {
|
|
case CSS_FONT_VARIANT_SMALL_CAPS:
|
|
pango_font_description_set_variant(desc, PANGO_VARIANT_SMALL_CAPS);
|
|
break;
|
|
case CSS_FONT_VARIANT_NORMAL:
|
|
default:
|
|
pango_font_description_set_variant(desc, PANGO_VARIANT_NORMAL);
|
|
}
|
|
#endif
|
|
}
|