497 lines
11 KiB
C
497 lines
11 KiB
C
/*
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* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
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* 2008 Vincent Sanders <vince@simtec.co.uk>
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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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#include <inttypes.h>
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#include <string.h>
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#include <assert.h>
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#include <stdlib.h>
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#include "utils/nsoption.h"
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#include "utils/utf8.h"
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#include "netsurf/utf8.h"
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#include "netsurf/layout.h"
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#include "netsurf/plot_style.h"
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#include "framebuffer/gui.h"
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#include "framebuffer/font.h"
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#include <font-ns-sans.h>
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#define GLYPH_LEN 16
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uint8_t code_point[GLYPH_LEN];
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uint8_t glyph_x2[GLYPH_LEN * 4];
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#define SEVEN_SET ((1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | \
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(1 << 4) | (1 << 5) | (1 << 6))
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#define THREE_SSS ((1 << 0) | (1 << 1) | (1 << 2))
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#define THREE_S_S ((1 << 0) | (1 << 2))
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#define THREE__SS ((1 << 0) | (1 << 1) )
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#define THREE_SS_ ( (1 << 1) | (1 << 2))
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#define THREE_S__ (1 << 2)
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#define THREE__S_ (1 << 1)
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#define THREE___S (1 << 0)
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uint8_t frag[16][5] = {
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{ THREE_SSS,
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THREE_S_S,
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THREE_S_S,
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THREE_S_S,
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THREE_SSS },
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{ THREE__S_,
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THREE_SS_,
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THREE__S_,
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THREE__S_,
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THREE_SSS },
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{ THREE_SS_,
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THREE___S,
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THREE__S_,
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THREE_S__,
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THREE_SSS },
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{ THREE_SS_,
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THREE___S,
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THREE_SS_,
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THREE___S,
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THREE_SS_ },
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{ THREE_S_S,
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THREE_S_S,
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THREE_SSS,
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THREE___S,
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THREE___S },
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{ THREE_SSS,
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THREE_S__,
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THREE_SSS,
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THREE___S,
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THREE_SSS },
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{ THREE__SS,
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THREE_S__,
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THREE_SSS,
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THREE_S_S,
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THREE_SSS },
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{ THREE_SSS,
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THREE___S,
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THREE__S_,
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THREE__S_,
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THREE__S_ },
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{ THREE_SSS,
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THREE_S_S,
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THREE_SSS,
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THREE_S_S,
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THREE_SSS },
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{ THREE_SSS,
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THREE_S_S,
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THREE_SSS,
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THREE___S,
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THREE___S },
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{ THREE__S_,
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THREE_S_S,
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THREE_SSS,
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THREE_S_S,
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THREE_S_S },
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{ THREE_SS_,
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THREE_S_S,
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THREE_SS_,
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THREE_S_S,
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THREE_SS_ },
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{ THREE__S_,
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THREE_S_S,
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THREE_S__,
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THREE_S_S,
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THREE__S_ },
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{ THREE_SS_,
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THREE_S_S,
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THREE_S_S,
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THREE_S_S,
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THREE_SS_ },
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{ THREE_SSS,
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THREE_S__,
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THREE_SS_,
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THREE_S__,
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THREE_SSS },
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{ THREE_SSS,
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THREE_S__,
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THREE_SS_,
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THREE_S__,
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THREE_S__ }
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};
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static uint8_t * get_codepoint(uint32_t id, bool italic)
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{
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int shift = 0;
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int l;
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int r;
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if (!italic)
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shift = 1;
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l = (id >> 12);
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r = 0xf & (id >> 8);
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code_point[ 0] = SEVEN_SET << shift;
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code_point[ 2] = (frag[l][0] << (4 + shift)) | (frag[r][0] << shift);
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code_point[ 3] = (frag[l][1] << (4 + shift)) | (frag[r][1] << shift);
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code_point[ 4] = (frag[l][2] << (4 + shift)) | (frag[r][2] << shift);
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code_point[ 5] = (frag[l][3] << (4 + shift)) | (frag[r][3] << shift);
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code_point[ 6] = (frag[l][4] << (4 + shift)) | (frag[r][4] << shift);
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shift = 1;
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l = 0xf & (id >> 4);
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r = 0xf & id;
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code_point[ 8] = (frag[l][0] << (4 + shift)) | (frag[r][0] << shift);
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code_point[ 9] = (frag[l][1] << (4 + shift)) | (frag[r][1] << shift);
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code_point[10] = (frag[l][2] << (4 + shift)) | (frag[r][2] << shift);
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code_point[11] = (frag[l][3] << (4 + shift)) | (frag[r][3] << shift);
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code_point[12] = (frag[l][4] << (4 + shift)) | (frag[r][4] << shift);
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code_point[14] = SEVEN_SET << shift;
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return (uint8_t *)code_point;
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}
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bool fb_font_init(void)
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{
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return true;
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}
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bool fb_font_finalise(void)
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{
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return true;
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}
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enum fb_font_style
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fb_get_font_style(const plot_font_style_t *fstyle)
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{
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enum fb_font_style style = FB_REGULAR;
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if (fstyle->weight >= 700)
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style |= FB_BOLD;
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if ((fstyle->flags & FONTF_ITALIC) || (fstyle->flags & FONTF_OBLIQUE))
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style |= FB_ITALIC;
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return style;
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}
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int
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fb_get_font_size(const plot_font_style_t *fstyle)
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{
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int size = fstyle->size * 10 /
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(((nsoption_int(font_min_size) * 3 +
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nsoption_int(font_size)) / 4) * PLOT_STYLE_SCALE);
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if (size > 2)
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size = 2;
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else if (size <= 0)
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size = 1;
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return size;
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}
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/** Lookup table to scale 4 bits to 8 bits, so e.g. 0101 --> 00110011 */
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const uint8_t glyph_lut[16] = {
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0x00, 0x03, 0x0c, 0x0f,
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0x30, 0x33, 0x3c, 0x3f,
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0xc0, 0xc3, 0xcc, 0xcf,
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0xf0, 0xf3, 0xfc, 0xff
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};
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static const uint8_t *
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glyph_scale_2(const uint8_t *glyph_data)
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{
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const uint8_t *glyph_max = glyph_data + GLYPH_LEN;
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uint8_t *pos = glyph_x2;
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do {
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*pos++ = glyph_lut[*glyph_data >> 4];
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*pos++ = glyph_lut[*glyph_data & 0xf];
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*pos++ = glyph_lut[*glyph_data >> 4];
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*pos++ = glyph_lut[*glyph_data & 0xf];
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} while (++glyph_data < glyph_max);
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return glyph_x2;
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}
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const uint8_t *
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fb_get_glyph(uint32_t ucs4, enum fb_font_style style, int scale)
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{
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const uint8_t *glyph_data;
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unsigned int section;
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unsigned int offset;
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uint16_t g_offset;
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/* Internal font has no glyphs beyond U+FFFF and there isn't
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* space to render a >4 digit codepoint; just show replacement
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* character. */
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if (ucs4 > 0xffff)
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ucs4 = 0xfffd;
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switch (style) {
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case FB_BOLD_ITALIC:
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section = fb_bold_italic_section_table[ucs4 / 256];
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if (section != 0 || ucs4 / 256 == 0) {
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offset = section * 256 + (ucs4 & 0xff);
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g_offset = fb_bold_italic_sections[offset] * 16;
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if (g_offset != 0) {
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glyph_data = &font_glyph_data[g_offset];
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break;
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}
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}
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/* Fall through. */
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case FB_BOLD:
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section = fb_bold_section_table[ucs4 / 256];
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if (section != 0 || ucs4 / 256 == 0) {
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offset = section * 256 + (ucs4 & 0xff);
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g_offset = fb_bold_sections[offset] * 16;
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if (g_offset != 0) {
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glyph_data = &font_glyph_data[g_offset];
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break;
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}
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}
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/* Fall through. */
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case FB_ITALIC:
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section = fb_italic_section_table[ucs4 / 256];
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if (section != 0 || ucs4 / 256 == 0) {
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offset = section * 256 + (ucs4 & 0xff);
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g_offset = fb_italic_sections[offset] * 16;
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if (g_offset != 0) {
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glyph_data = &font_glyph_data[g_offset];
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break;
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}
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}
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/* Fall through. */
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case FB_REGULAR:
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section = fb_regular_section_table[ucs4 / 256];
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if (section != 0 || ucs4 / 256 == 0) {
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offset = section * 256 + (ucs4 & 0xff);
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g_offset = fb_regular_sections[offset] * 16;
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if (g_offset != 0) {
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glyph_data = &font_glyph_data[g_offset];
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break;
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}
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}
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/* Fall through. */
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default:
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glyph_data = get_codepoint(ucs4, style & FB_ITALIC);
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break;
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}
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switch (scale) {
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case 1:
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break;
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case 2:
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glyph_data = glyph_scale_2(glyph_data);
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break;
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default:
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assert(scale >= 1 && scale <= 2);
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break;
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}
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return glyph_data;
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}
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static nserror utf8_to_local(const char *string,
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size_t len,
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char **result)
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{
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return utf8_to_enc(string, "CP1252", len, result);
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}
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static nserror utf8_from_local(const char *string,
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size_t len,
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char **result)
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{
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*result = malloc(len + 1);
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if (*result == NULL) {
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return NSERROR_NOMEM;
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}
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memcpy(*result, string, len);
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(*result)[len] = '\0';
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return NSERROR_OK;
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}
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/* exported interface documented in framebuffer/freetype_font.h */
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nserror
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fb_font_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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size_t nxtchr = 0;
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*width = 0;
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while (nxtchr < length) {
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uint32_t ucs4;
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ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr);
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if (codepoint_displayable(ucs4)) {
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*width += FB_FONT_WIDTH;
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}
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nxtchr = utf8_next(string, length, nxtchr);
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}
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*width *= fb_get_font_size(fstyle);
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return NSERROR_OK;
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}
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/* exported interface documented in framebuffer/freetype_font.h */
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nserror
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fb_font_position(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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const int width = fb_get_font_size(fstyle) * FB_FONT_WIDTH;
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size_t nxtchr = 0;
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int x_pos = 0;
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while (nxtchr < length) {
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uint32_t ucs4;
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if (abs(x_pos - x) <= (width / 2))
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break;
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ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr);
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if (codepoint_displayable(ucs4)) {
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x_pos += width;
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}
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nxtchr = utf8_next(string, length, nxtchr);
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}
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*actual_x = x_pos;
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*char_offset = nxtchr;
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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 fstyle style for this text
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* \param string UTF-8 string to measure
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* \param length length of string, in bytes
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* \param x width available
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* \param char_offset updated to offset in string of actual_x, [1..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 indicates first character after split point.
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*
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* Note: char_offset of 0 should 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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fb_font_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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const int width = fb_get_font_size(fstyle) * FB_FONT_WIDTH;
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size_t nxtchr = 0;
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int last_space_x = 0;
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int last_space_idx = 0;
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*actual_x = 0;
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while (nxtchr < length) {
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uint32_t ucs4;
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if (string[nxtchr] == ' ') {
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last_space_x = *actual_x;
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last_space_idx = nxtchr;
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}
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ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr);
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if (codepoint_displayable(ucs4)) {
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*actual_x += width;
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}
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if (*actual_x > x && last_space_idx != 0) {
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/* string has exceeded available width and we've
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* found a space; return previous space */
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*actual_x = last_space_x;
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*char_offset = last_space_idx;
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return NSERROR_OK;
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}
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nxtchr = utf8_next(string, length, nxtchr);
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}
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*char_offset = nxtchr;
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return NSERROR_OK;
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}
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static struct gui_layout_table layout_table = {
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.width = fb_font_width,
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.position = fb_font_position,
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.split = fb_font_split,
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};
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struct gui_layout_table *framebuffer_layout_table = &layout_table;
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static struct gui_utf8_table utf8_table = {
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.utf8_to_local = utf8_to_local,
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.local_to_utf8 = utf8_from_local,
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};
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struct gui_utf8_table *framebuffer_utf8_table = &utf8_table;
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/*
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* Local Variables:
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* c-basic-offset:8
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* End:
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*/
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