/* * Copyright 2005 James Bursa * 2008 Vincent Sanders * * 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 . */ #include #include #include #include "utils/nsoption.h" #include "utils/utf8.h" #include "desktop/gui.h" #include "css/css.h" #include "render/font.h" #include "framebuffer/gui.h" #include "framebuffer/font.h" #include "framebuffer/GEN_font_internal.c" #define GLYPH_LEN 16 uint8_t code_point[GLYPH_LEN]; uint8_t glyph_x2[GLYPH_LEN * 4]; #define SEVEN_SET ((1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | \ (1 << 4) | (1 << 5) | (1 << 6)) #define THREE_SSS ((1 << 0) | (1 << 1) | (1 << 2)) #define THREE_S_S ((1 << 0) | (1 << 2)) #define THREE__SS ((1 << 0) | (1 << 1) ) #define THREE_SS_ ( (1 << 1) | (1 << 2)) #define THREE_S__ (1 << 2) #define THREE__S_ (1 << 1) #define THREE___S (1 << 0) uint8_t frag[16][5] = { { THREE_SSS, THREE_S_S, THREE_S_S, THREE_S_S, THREE_SSS }, { THREE__S_, THREE_SS_, THREE__S_, THREE__S_, THREE_SSS }, { THREE_SS_, THREE___S, THREE__S_, THREE_S__, THREE_SSS }, { THREE_SS_, THREE___S, THREE_SS_, THREE___S, THREE_SS_ }, { THREE_S_S, THREE_S_S, THREE_SSS, THREE___S, THREE___S }, { THREE_SSS, THREE_S__, THREE_SSS, THREE___S, THREE_SSS }, { THREE__SS, THREE_S__, THREE_SSS, THREE_S_S, THREE_SSS }, { THREE_SSS, THREE___S, THREE__S_, THREE__S_, THREE__S_ }, { THREE_SSS, THREE_S_S, THREE_SSS, THREE_S_S, THREE_SSS }, { THREE_SSS, THREE_S_S, THREE_SSS, THREE___S, THREE___S }, { THREE__S_, THREE_S_S, THREE_SSS, THREE_S_S, THREE_S_S }, { THREE_SS_, THREE_S_S, THREE_SS_, THREE_S_S, THREE_SS_ }, { THREE__S_, THREE_S_S, THREE_S__, THREE_S_S, THREE__S_ }, { THREE_SS_, THREE_S_S, THREE_S_S, THREE_S_S, THREE_SS_ }, { THREE_SSS, THREE_S__, THREE_SS_, THREE_S__, THREE_SSS }, { THREE_SSS, THREE_S__, THREE_SS_, THREE_S__, THREE_S__ } }; static uint8_t * get_codepoint(uint32_t id, bool italic) { int shift = 0; int l; int r; if (!italic) shift = 1; l = (id >> 12); r = 0xf & (id >> 8); code_point[ 0] = SEVEN_SET << shift; code_point[ 2] = (frag[l][0] << (4 + shift)) | (frag[r][0] << shift); code_point[ 3] = (frag[l][1] << (4 + shift)) | (frag[r][1] << shift); code_point[ 4] = (frag[l][2] << (4 + shift)) | (frag[r][2] << shift); code_point[ 5] = (frag[l][3] << (4 + shift)) | (frag[r][3] << shift); code_point[ 6] = (frag[l][4] << (4 + shift)) | (frag[r][4] << shift); shift = 1; l = 0xf & (id >> 4); r = 0xf & id; code_point[ 8] = (frag[l][0] << (4 + shift)) | (frag[r][0] << shift); code_point[ 9] = (frag[l][1] << (4 + shift)) | (frag[r][1] << shift); code_point[10] = (frag[l][2] << (4 + shift)) | (frag[r][2] << shift); code_point[11] = (frag[l][3] << (4 + shift)) | (frag[r][3] << shift); code_point[12] = (frag[l][4] << (4 + shift)) | (frag[r][4] << shift); code_point[14] = SEVEN_SET << shift; return (uint8_t *)code_point; } bool fb_font_init(void) { return true; } bool fb_font_finalise(void) { return true; } enum fb_font_style fb_get_font_style(const plot_font_style_t *fstyle) { if (fstyle->weight >= 700) { if ((fstyle->flags & FONTF_ITALIC) || (fstyle->flags & FONTF_OBLIQUE)) { return FB_BOLD_ITALIC; } else { return FB_BOLD; } } else { if ((fstyle->flags & FONTF_ITALIC) || (fstyle->flags & FONTF_OBLIQUE)) { return FB_ITALIC; } else { return FB_REGULAR; } } } int fb_get_font_size(const plot_font_style_t *fstyle) { int size = fstyle->size * 10 / (((nsoption_int(font_min_size) * 3 + nsoption_int(font_size)) / 4) * FONT_SIZE_SCALE); if (size > 2) size = 2; else if (size <= 0) size = 1; return size; } static const uint8_t * glyph_scale_2(const uint8_t *glyph_data) { int y, x; uint8_t *pos = glyph_x2; for (y = 0; y < 16; y++) { *pos = 0; for (x = 0; x < 4; x++) { if (glyph_data[y] & (1 << (7 - x))) { *pos |= 1 << ((3 - x) * 2); *pos |= 1 << ((3 - x) * 2 + 1); } } pos++; *pos = 0; for (x = 4; x < 8; x++) { if (glyph_data[y] & (1 << (7 - x))) { *pos |= 1 << ((7 - x) * 2); *pos |= 1 << ((7 - x) * 2 + 1); } } pos++; *pos = 0; for (x = 0; x < 4; x++) { if (glyph_data[y] & (1 << (7 - x))) { *pos |= 1 << ((3 - x) * 2); *pos |= 1 << ((3 - x) * 2 + 1); } } pos++; *pos = 0; for (x = 4; x < 8; x++) { if (glyph_data[y] & (1 << (7 - x))) { *pos |= 1 << ((7 - x) * 2); *pos |= 1 << ((7 - x) * 2 + 1); } } pos++; } return glyph_x2; } const uint8_t * fb_get_glyph(uint32_t ucs4, enum fb_font_style style, int scale) { const uint8_t *glyph_data; unsigned int section; unsigned int offset; uint16_t g_offset; /* Internal font has no glyphs beyond U+FFFF and there isn't * space to render a >4 digit codepoint; just show replacement * character. */ if (ucs4 > 0xffff) ucs4 = 0xfffd; switch (style) { case FB_BOLD_ITALIC: section = fb_bold_italic_section_table[ucs4 / 256]; if (section != 0 || ucs4 / 256 == 0) { offset = section * 256 + (ucs4 & 0xff); g_offset = fb_bold_italic_sections[offset] * 16; if (g_offset != 0) { glyph_data = &font_glyph_data[g_offset]; break; } } case FB_BOLD: section = fb_bold_section_table[ucs4 / 256]; if (section != 0 || ucs4 / 256 == 0) { offset = section * 256 + (ucs4 & 0xff); g_offset = fb_bold_sections[offset] * 16; if (g_offset != 0) { glyph_data = &font_glyph_data[g_offset]; break; } } case FB_ITALIC: section = fb_italic_section_table[ucs4 / 256]; if (section != 0 || ucs4 / 256 == 0) { offset = section * 256 + (ucs4 & 0xff); g_offset = fb_italic_sections[offset] * 16; if (g_offset != 0) { glyph_data = &font_glyph_data[g_offset]; break; } } case FB_REGULAR: section = fb_regular_section_table[ucs4 / 256]; if (section != 0 || ucs4 / 256 == 0) { offset = section * 256 + (ucs4 & 0xff); g_offset = fb_regular_sections[offset] * 16; if (g_offset != 0) { glyph_data = &font_glyph_data[g_offset]; break; } } default: glyph_data = get_codepoint(ucs4, style & FB_ITALIC); break; } switch (scale) { case 1: break; case 2: glyph_data = glyph_scale_2(glyph_data); break; default: assert(scale >= 1 && scale <= 2); break; } return glyph_data; } static nserror utf8_to_local(const char *string, size_t len, char **result) { return utf8_to_enc(string, "CP1252", len, result); } static nserror utf8_from_local(const char *string, size_t len, char **result) { *result = malloc(len + 1); if (*result == NULL) { return NSERROR_NOMEM; } memcpy(*result, string, len); (*result)[len] = '\0'; return NSERROR_OK; } static bool nsfont_width(const plot_font_style_t *fstyle, const char *string, size_t length, int *width) { size_t nxtchr = 0; *width = 0; while (nxtchr < length) { uint32_t ucs4; ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr); if (codepoint_displayable(ucs4)) { *width += FB_FONT_WIDTH; } nxtchr = utf8_next(string, length, nxtchr); } *width *= fb_get_font_size(fstyle); return true; } /** * Find the position in a string where an x coordinate falls. * * \param fstyle style for this text * \param string UTF-8 string to measure * \param length length of string * \param x x coordinate to search for * \param char_offset updated to offset in string of actual_x, [0..length] * \param actual_x updated to x coordinate of character closest to x * \return true on success, false on error and error reported */ static bool 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) { const int width = fb_get_font_size(fstyle) * FB_FONT_WIDTH; size_t nxtchr = 0; int x_pos = 0; while (nxtchr < length) { uint32_t ucs4; if (abs(x_pos - x) <= (width / 2)) break; ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr); if (codepoint_displayable(ucs4)) { x_pos += width; } nxtchr = utf8_next(string, length, nxtchr); } *actual_x = x_pos; *char_offset = nxtchr; return true; } /** * Find where to split a string to make it fit a width. * * \param fstyle style for this text * \param string UTF-8 string to measure * \param length length of string, in bytes * \param x width available * \param char_offset updated to offset in string of actual_x, [1..length] * \param actual_x updated to x coordinate of character closest to x * \return true on success, false on error and error reported * * On exit, char_offset indicates first character after split point. * * Note: char_offset of 0 should 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 bool nsfont_split(const plot_font_style_t *fstyle, const char *string, size_t length, int x, size_t *char_offset, int *actual_x) { const int width = fb_get_font_size(fstyle) * FB_FONT_WIDTH; size_t nxtchr = 0; int last_space_x = 0; int last_space_idx = 0; *actual_x = 0; while (nxtchr < length) { uint32_t ucs4; if (string[nxtchr] == ' ') { last_space_x = *actual_x; last_space_idx = nxtchr; } ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr); if (codepoint_displayable(ucs4)) { *actual_x += width; } if (*actual_x > x && last_space_idx != 0) { /* string has exceeded available width and we've * found a space; return previous space */ *actual_x = last_space_x; *char_offset = last_space_idx; return true; } nxtchr = utf8_next(string, length, nxtchr); } *char_offset = nxtchr; return true; } const struct font_functions nsfont = { nsfont_width, nsfont_position_in_string, nsfont_split }; static struct gui_utf8_table utf8_table = { .utf8_to_local = utf8_to_local, .local_to_utf8 = utf8_from_local, }; struct gui_utf8_table *framebuffer_utf8_table = &utf8_table; /* * Local Variables: * c-basic-offset:8 * End: */