572 lines
16 KiB
C
572 lines
16 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 <assert.h>
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#include <ft2build.h>
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#include FT_CACHE_H
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#include "netsurf/inttypes.h"
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#include "utils/filepath.h"
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#include "utils/utf8.h"
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#include "utils/log.h"
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#include "utils/nsoption.h"
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#include "netsurf/utf8.h"
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#include "netsurf/layout.h"
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#include "netsurf/browser_window.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 "framebuffer/findfile.h"
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/* glyph cache minimum size */
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#define CACHE_MIN_SIZE (100 * 1024)
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#define BOLD_WEIGHT 700
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static FT_Library library;
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static FTC_Manager ft_cmanager;
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static FTC_CMapCache ft_cmap_cache ;
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static FTC_ImageCache ft_image_cache;
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int ft_load_type;
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/* cache manager faceID data to create freetype faceid on demand */
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typedef struct fb_faceid_s {
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char *fontfile; /* path to font */
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int index; /* index of font */
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int cidx; /* character map index for unicode */
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} fb_faceid_t;
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enum fb_face_e {
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FB_FACE_SANS_SERIF = 0,
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FB_FACE_SANS_SERIF_BOLD,
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FB_FACE_SANS_SERIF_ITALIC,
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FB_FACE_SANS_SERIF_ITALIC_BOLD,
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FB_FACE_SERIF,
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FB_FACE_SERIF_BOLD,
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FB_FACE_MONOSPACE,
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FB_FACE_MONOSPACE_BOLD,
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FB_FACE_CURSIVE,
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FB_FACE_FANTASY,
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FB_FACE_COUNT
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};
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/* defines for accesing the faces */
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#define FB_FACE_DEFAULT 0
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static fb_faceid_t *fb_faces[FB_FACE_COUNT];
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/**
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* map cache manager handle to face id
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*/
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static FT_Error
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ft_face_requester(FTC_FaceID face_id,
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FT_Library library,
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FT_Pointer request_data,
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FT_Face *face )
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{
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FT_Error error;
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fb_faceid_t *fb_face = (fb_faceid_t *)face_id;
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int cidx;
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error = FT_New_Face(library, fb_face->fontfile, fb_face->index, face);
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if (error) {
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NSLOG(netsurf, INFO, "Could not find font (code %d)", error);
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} else {
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error = FT_Select_Charmap(*face, FT_ENCODING_UNICODE);
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if (error) {
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NSLOG(netsurf, INFO,
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"Could not select charmap (code %d)", error);
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} else {
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for (cidx = 0; cidx < (*face)->num_charmaps; cidx++) {
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if ((*face)->charmap == (*face)->charmaps[cidx]) {
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fb_face->cidx = cidx;
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break;
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}
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}
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}
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}
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NSLOG(netsurf, INFO, "Loaded face from %s", fb_face->fontfile);
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return error;
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}
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/**
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* create new framebuffer face and cause it to be loaded to check its ok
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*/
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static fb_faceid_t *
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fb_new_face(const char *option, const char *resname, const char *fontname)
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{
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fb_faceid_t *newf;
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FT_Error error;
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FT_Face aface;
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char buf[PATH_MAX];
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newf = calloc(1, sizeof(fb_faceid_t));
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if (option != NULL) {
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newf->fontfile = strdup(option);
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} else {
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filepath_sfind(respaths, buf, fontname);
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newf->fontfile = strdup(buf);
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}
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error = FTC_Manager_LookupFace(ft_cmanager, (FTC_FaceID)newf, &aface);
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if (error) {
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NSLOG(netsurf, INFO, "Could not find font face %s (code %d)",
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fontname, error);
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free(newf->fontfile);
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free(newf);
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newf = NULL;
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}
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return newf;
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}
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/* exported interface documented in framebuffer/font.h */
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bool fb_font_init(void)
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{
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FT_Error error;
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FT_ULong max_cache_size;
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FT_UInt max_faces = 6;
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fb_faceid_t *fb_face;
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/* freetype library initialise */
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error = FT_Init_FreeType( &library );
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if (error) {
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NSLOG(netsurf, INFO,
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"Freetype could not initialised (code %d)", error);
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return false;
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}
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/* set the Glyph cache size up */
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max_cache_size = nsoption_int(fb_font_cachesize) * 1024;
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if (max_cache_size < CACHE_MIN_SIZE) {
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max_cache_size = CACHE_MIN_SIZE;
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}
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/* cache manager initialise */
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error = FTC_Manager_New(library,
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max_faces,
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0,
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max_cache_size,
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ft_face_requester,
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NULL,
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&ft_cmanager);
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if (error) {
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NSLOG(netsurf, INFO,
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"Freetype could not initialise cache manager (code %d)",
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error);
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FT_Done_FreeType(library);
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return false;
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}
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error = FTC_CMapCache_New(ft_cmanager, &ft_cmap_cache);
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error = FTC_ImageCache_New(ft_cmanager, &ft_image_cache);
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/* need to obtain the generic font faces */
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/* Start with the sans serif font */
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fb_face = fb_new_face(nsoption_charp(fb_face_sans_serif),
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"sans_serif.ttf",
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NETSURF_FB_FONT_SANS_SERIF);
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if (fb_face == NULL) {
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/* The sans serif font is the default and must be found. */
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NSLOG(netsurf, INFO, "Could not find the default font");
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FTC_Manager_Done(ft_cmanager);
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FT_Done_FreeType(library);
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return false;
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} else {
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fb_faces[FB_FACE_SANS_SERIF] = fb_face;
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}
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/* Bold sans serif face */
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fb_face = fb_new_face(nsoption_charp(fb_face_sans_serif_bold),
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"sans_serif_bold.ttf",
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NETSURF_FB_FONT_SANS_SERIF_BOLD);
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if (fb_face == NULL) {
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/* seperate bold face unavailabe use the normal weight version */
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fb_faces[FB_FACE_SANS_SERIF_BOLD] = fb_faces[FB_FACE_SANS_SERIF];
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} else {
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fb_faces[FB_FACE_SANS_SERIF_BOLD] = fb_face;
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}
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/* Italic sans serif face */
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fb_face = fb_new_face(nsoption_charp(fb_face_sans_serif_italic),
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"sans_serif_italic.ttf",
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NETSURF_FB_FONT_SANS_SERIF_ITALIC);
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if (fb_face == NULL) {
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/* seperate italic face unavailabe use the normal weight version */
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fb_faces[FB_FACE_SANS_SERIF_ITALIC] = fb_faces[FB_FACE_SANS_SERIF];
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} else {
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fb_faces[FB_FACE_SANS_SERIF_ITALIC] = fb_face;
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}
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/* Bold italic sans serif face */
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fb_face = fb_new_face(nsoption_charp(fb_face_sans_serif_italic_bold),
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"sans_serif_italic_bold.ttf",
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NETSURF_FB_FONT_SANS_SERIF_ITALIC_BOLD);
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if (fb_face == NULL) {
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/* seperate italic face unavailabe use the normal weight version */
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fb_faces[FB_FACE_SANS_SERIF_ITALIC_BOLD] = fb_faces[FB_FACE_SANS_SERIF];
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} else {
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fb_faces[FB_FACE_SANS_SERIF_ITALIC_BOLD] = fb_face;
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}
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/* serif face */
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fb_face = fb_new_face(nsoption_charp(fb_face_serif),
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"serif.ttf",
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NETSURF_FB_FONT_SERIF);
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if (fb_face == NULL) {
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/* serif face unavailabe use the default */
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fb_faces[FB_FACE_SERIF] = fb_faces[FB_FACE_SANS_SERIF];
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} else {
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fb_faces[FB_FACE_SERIF] = fb_face;
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}
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/* bold serif face*/
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fb_face = fb_new_face(nsoption_charp(fb_face_serif_bold),
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"serif_bold.ttf",
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NETSURF_FB_FONT_SERIF_BOLD);
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if (fb_face == NULL) {
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/* bold serif face unavailabe use the normal weight */
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fb_faces[FB_FACE_SERIF_BOLD] = fb_faces[FB_FACE_SERIF];
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} else {
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fb_faces[FB_FACE_SERIF_BOLD] = fb_face;
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}
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/* monospace face */
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fb_face = fb_new_face(nsoption_charp(fb_face_monospace),
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"monospace.ttf",
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NETSURF_FB_FONT_MONOSPACE);
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if (fb_face == NULL) {
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/* serif face unavailabe use the default */
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fb_faces[FB_FACE_MONOSPACE] = fb_faces[FB_FACE_SANS_SERIF];
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} else {
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fb_faces[FB_FACE_MONOSPACE] = fb_face;
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}
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/* bold monospace face*/
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fb_face = fb_new_face(nsoption_charp(fb_face_monospace_bold),
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"monospace_bold.ttf",
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NETSURF_FB_FONT_MONOSPACE_BOLD);
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if (fb_face == NULL) {
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/* bold serif face unavailabe use the normal weight */
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fb_faces[FB_FACE_MONOSPACE_BOLD] = fb_faces[FB_FACE_MONOSPACE];
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} else {
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fb_faces[FB_FACE_MONOSPACE_BOLD] = fb_face;
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}
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/* cursive face */
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fb_face = fb_new_face(nsoption_charp(fb_face_cursive),
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"cursive.ttf",
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NETSURF_FB_FONT_CURSIVE);
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if (fb_face == NULL) {
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/* cursive face unavailabe use the default */
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fb_faces[FB_FACE_CURSIVE] = fb_faces[FB_FACE_SANS_SERIF];
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} else {
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fb_faces[FB_FACE_CURSIVE] = fb_face;
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}
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/* fantasy face */
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fb_face = fb_new_face(nsoption_charp(fb_face_fantasy),
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"fantasy.ttf",
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NETSURF_FB_FONT_FANTASY);
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if (fb_face == NULL) {
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/* fantasy face unavailabe use the default */
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fb_faces[FB_FACE_FANTASY] = fb_faces[FB_FACE_SANS_SERIF];
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} else {
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fb_faces[FB_FACE_FANTASY] = fb_face;
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}
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/* set the default render mode */
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if (nsoption_bool(fb_font_monochrome) == true)
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ft_load_type = FT_LOAD_MONOCHROME; /* faster but less pretty */
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else
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ft_load_type = 0;
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return true;
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}
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/* exported interface documented in framebuffer/font.h */
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bool fb_font_finalise(void)
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{
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int i, j;
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FTC_Manager_Done(ft_cmanager);
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FT_Done_FreeType(library);
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for (i = 0; i < FB_FACE_COUNT; i++) {
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if (fb_faces[i] == NULL)
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continue;
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/* Unset any faces that duplicate this one */
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for (j = i + 1; j < FB_FACE_COUNT; j++) {
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if (fb_faces[i] == fb_faces[j])
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fb_faces[j] = NULL;
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}
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free(fb_faces[i]->fontfile);
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free(fb_faces[i]);
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fb_faces[i] = NULL;
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}
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return true;
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}
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/**
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* fill freetype scalar
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*/
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static void fb_fill_scalar(const plot_font_style_t *fstyle, FTC_Scaler srec)
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{
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int selected_face = FB_FACE_DEFAULT;
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switch (fstyle->family) {
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case PLOT_FONT_FAMILY_SERIF:
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if (fstyle->weight >= BOLD_WEIGHT) {
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selected_face = FB_FACE_SERIF_BOLD;
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} else {
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selected_face = FB_FACE_SERIF;
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}
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break;
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case PLOT_FONT_FAMILY_MONOSPACE:
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if (fstyle->weight >= BOLD_WEIGHT) {
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selected_face = FB_FACE_MONOSPACE_BOLD;
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} else {
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selected_face = FB_FACE_MONOSPACE;
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}
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break;
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case PLOT_FONT_FAMILY_CURSIVE:
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selected_face = FB_FACE_CURSIVE;
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break;
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case PLOT_FONT_FAMILY_FANTASY:
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selected_face = FB_FACE_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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if ((fstyle->flags & FONTF_ITALIC) ||
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(fstyle->flags & FONTF_OBLIQUE)) {
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if (fstyle->weight >= BOLD_WEIGHT) {
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selected_face = FB_FACE_SANS_SERIF_ITALIC_BOLD;
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} else {
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selected_face = FB_FACE_SANS_SERIF_ITALIC;
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}
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} else {
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if (fstyle->weight >= BOLD_WEIGHT) {
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selected_face = FB_FACE_SANS_SERIF_BOLD;
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} else {
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selected_face = FB_FACE_SANS_SERIF;
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}
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}
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}
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srec->face_id = (FTC_FaceID)fb_faces[selected_face];
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srec->width = srec->height = (fstyle->size * 64) / FONT_SIZE_SCALE;
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srec->pixel = 0;
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srec->x_res = srec->y_res = browser_get_dpi();
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}
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/* exported interface documented in framebuffer/freetype_font.h */
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FT_Glyph fb_getglyph(const plot_font_style_t *fstyle, uint32_t ucs4)
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{
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FT_UInt glyph_index;
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FTC_ScalerRec srec;
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FT_Glyph glyph;
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FT_Error error;
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fb_faceid_t *fb_face;
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fb_fill_scalar(fstyle, &srec);
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fb_face = (fb_faceid_t *)srec.face_id;
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glyph_index = FTC_CMapCache_Lookup(ft_cmap_cache, srec.face_id,
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fb_face->cidx, ucs4);
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error = FTC_ImageCache_LookupScaler(ft_image_cache,
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&srec,
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FT_LOAD_RENDER |
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FT_LOAD_FORCE_AUTOHINT |
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ft_load_type,
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glyph_index,
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&glyph,
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NULL);
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if (error != 0)
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return NULL;
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return glyph;
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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, size_t length,
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int *width)
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{
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uint32_t ucs4;
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size_t nxtchr = 0;
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FT_Glyph glyph;
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*width = 0;
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while (nxtchr < length) {
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ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr);
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nxtchr = utf8_next(string, length, nxtchr);
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glyph = fb_getglyph(fstyle, ucs4);
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if (glyph == NULL)
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continue;
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*width += glyph->advance.x >> 16;
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}
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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, size_t length,
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int x, size_t *char_offset, int *actual_x)
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{
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uint32_t ucs4;
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size_t nxtchr = 0;
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FT_Glyph glyph;
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int prev_x = 0;
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*actual_x = 0;
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while (nxtchr < length) {
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ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr);
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glyph = fb_getglyph(fstyle, ucs4);
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if (glyph == NULL)
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continue;
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*actual_x += glyph->advance.x >> 16;
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if (*actual_x > x)
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break;
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prev_x = *actual_x;
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nxtchr = utf8_next(string, length, nxtchr);
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}
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/* choose nearest of previous and last x */
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if (abs(*actual_x - x) > abs(prev_x - x))
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*actual_x = prev_x;
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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.
|
|
*
|
|
* Returns:
|
|
* char_offset giving split point closest to x, where actual_x <= x
|
|
* else
|
|
* char_offset giving split point closest to x, where actual_x > x
|
|
*
|
|
* Returning char_offset == length means no split possible
|
|
*/
|
|
static nserror
|
|
fb_font_split(const plot_font_style_t *fstyle,
|
|
const char *string, size_t length,
|
|
int x, size_t *char_offset, int *actual_x)
|
|
{
|
|
uint32_t ucs4;
|
|
size_t nxtchr = 0;
|
|
int last_space_x = 0;
|
|
int last_space_idx = 0;
|
|
FT_Glyph glyph;
|
|
|
|
*actual_x = 0;
|
|
while (nxtchr < length) {
|
|
ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr);
|
|
|
|
glyph = fb_getglyph(fstyle, ucs4);
|
|
if (glyph == NULL)
|
|
continue;
|
|
|
|
if (ucs4 == 0x20) {
|
|
last_space_x = *actual_x;
|
|
last_space_idx = nxtchr;
|
|
}
|
|
|
|
*actual_x += glyph->advance.x >> 16;
|
|
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 NSERROR_OK;
|
|
}
|
|
|
|
nxtchr = utf8_next(string, length, nxtchr);
|
|
}
|
|
|
|
*char_offset = nxtchr;
|
|
|
|
return NSERROR_OK;
|
|
}
|
|
|
|
static struct gui_layout_table layout_table = {
|
|
.width = fb_font_width,
|
|
.position = fb_font_position,
|
|
.split = fb_font_split,
|
|
};
|
|
|
|
struct gui_layout_table *framebuffer_layout_table = &layout_table;
|
|
|
|
|
|
struct gui_utf8_table *framebuffer_utf8_table = NULL;
|
|
|
|
/*
|
|
* Local Variables:
|
|
* c-basic-offset:8
|
|
* End:
|
|
*/
|