eukara
/
WebSurf
0
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
WebSurf/frontends/framebuffer/font_freetype.c

572 lines
16 KiB
C
Raw Permalink Blame History

/*
* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
* 2008 Vincent Sanders <vince@simtec.co.uk>
*
* 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 <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <ft2build.h>
#include FT_CACHE_H
#include "netsurf/inttypes.h"
#include "utils/filepath.h"
#include "utils/utf8.h"
#include "utils/log.h"
#include "utils/nsoption.h"
#include "netsurf/utf8.h"
#include "netsurf/layout.h"
#include "netsurf/browser.h"
#include "netsurf/plot_style.h"
#include "framebuffer/gui.h"
#include "framebuffer/font.h"
#include "framebuffer/findfile.h"
/* glyph cache minimum size */
#define CACHE_MIN_SIZE (100 * 1024)
#define BOLD_WEIGHT 700
static FT_Library library;
static FTC_Manager ft_cmanager;
static FTC_CMapCache ft_cmap_cache ;
static FTC_ImageCache ft_image_cache;
int ft_load_type;
/* cache manager faceID data to create freetype faceid on demand */
typedef struct fb_faceid_s {
char *fontfile; /* path to font */
int index; /* index of font */
int cidx; /* character map index for unicode */
} fb_faceid_t;
enum fb_face_e {
FB_FACE_SANS_SERIF = 0,
FB_FACE_SANS_SERIF_BOLD,
FB_FACE_SANS_SERIF_ITALIC,
FB_FACE_SANS_SERIF_ITALIC_BOLD,
FB_FACE_SERIF,
FB_FACE_SERIF_BOLD,
FB_FACE_MONOSPACE,
FB_FACE_MONOSPACE_BOLD,
FB_FACE_CURSIVE,
FB_FACE_FANTASY,
FB_FACE_COUNT
};
/* defines for accesing the faces */
#define FB_FACE_DEFAULT 0
static fb_faceid_t *fb_faces[FB_FACE_COUNT];
/**
* map cache manager handle to face id
*/
static FT_Error
ft_face_requester(FTC_FaceID face_id,
FT_Library library,
FT_Pointer request_data,
FT_Face *face )
{
FT_Error error;
fb_faceid_t *fb_face = (fb_faceid_t *)face_id;
int cidx;
error = FT_New_Face(library, fb_face->fontfile, fb_face->index, face);
if (error) {
NSLOG(netsurf, INFO, "Could not find font (code %d)", error);
} else {
error = FT_Select_Charmap(*face, FT_ENCODING_UNICODE);
if (error) {
NSLOG(netsurf, INFO,
"Could not select charmap (code %d)", error);
} else {
for (cidx = 0; cidx < (*face)->num_charmaps; cidx++) {
if ((*face)->charmap == (*face)->charmaps[cidx]) {
fb_face->cidx = cidx;
break;
}
}
}
}
NSLOG(netsurf, INFO, "Loaded face from %s", fb_face->fontfile);
return error;
}
/**
* create new framebuffer face and cause it to be loaded to check its ok
*/
static fb_faceid_t *
fb_new_face(const char *option, const char *resname, const char *fontname)
{
fb_faceid_t *newf;
FT_Error error;
FT_Face aface;
char buf[PATH_MAX];
newf = calloc(1, sizeof(fb_faceid_t));
if (option != NULL) {
newf->fontfile = strdup(option);
} else {
filepath_sfind(respaths, buf, fontname);
newf->fontfile = strdup(buf);
}
error = FTC_Manager_LookupFace(ft_cmanager, (FTC_FaceID)newf, &aface);
if (error) {
NSLOG(netsurf, INFO, "Could not find font face %s (code %d)",
fontname, error);
free(newf->fontfile);
free(newf);
newf = NULL;
}
return newf;
}
/* exported interface documented in framebuffer/font.h */
bool fb_font_init(void)
{
FT_Error error;
FT_ULong max_cache_size;
FT_UInt max_faces = 6;
fb_faceid_t *fb_face;
/* freetype library initialise */
error = FT_Init_FreeType( &library );
if (error) {
NSLOG(netsurf, INFO,
"Freetype could not initialised (code %d)", error);
return false;
}
/* set the Glyph cache size up */
max_cache_size = nsoption_int(fb_font_cachesize) * 1024;
if (max_cache_size < CACHE_MIN_SIZE) {
max_cache_size = CACHE_MIN_SIZE;
}
/* cache manager initialise */
error = FTC_Manager_New(library,
max_faces,
0,
max_cache_size,
ft_face_requester,
NULL,
&ft_cmanager);
if (error) {
NSLOG(netsurf, INFO,
"Freetype could not initialise cache manager (code %d)",
error);
FT_Done_FreeType(library);
return false;
}
error = FTC_CMapCache_New(ft_cmanager, &ft_cmap_cache);
error = FTC_ImageCache_New(ft_cmanager, &ft_image_cache);
/* need to obtain the generic font faces */
/* Start with the sans serif font */
fb_face = fb_new_face(nsoption_charp(fb_face_sans_serif),
"sans_serif.ttf",
NETSURF_FB_FONT_SANS_SERIF);
if (fb_face == NULL) {
/* The sans serif font is the default and must be found. */
NSLOG(netsurf, INFO, "Could not find the default font");
FTC_Manager_Done(ft_cmanager);
FT_Done_FreeType(library);
return false;
} else {
fb_faces[FB_FACE_SANS_SERIF] = fb_face;
}
/* Bold sans serif face */
fb_face = fb_new_face(nsoption_charp(fb_face_sans_serif_bold),
"sans_serif_bold.ttf",
NETSURF_FB_FONT_SANS_SERIF_BOLD);
if (fb_face == NULL) {
/* seperate bold face unavailabe use the normal weight version */
fb_faces[FB_FACE_SANS_SERIF_BOLD] = fb_faces[FB_FACE_SANS_SERIF];
} else {
fb_faces[FB_FACE_SANS_SERIF_BOLD] = fb_face;
}
/* Italic sans serif face */
fb_face = fb_new_face(nsoption_charp(fb_face_sans_serif_italic),
"sans_serif_italic.ttf",
NETSURF_FB_FONT_SANS_SERIF_ITALIC);
if (fb_face == NULL) {
/* seperate italic face unavailabe use the normal weight version */
fb_faces[FB_FACE_SANS_SERIF_ITALIC] = fb_faces[FB_FACE_SANS_SERIF];
} else {
fb_faces[FB_FACE_SANS_SERIF_ITALIC] = fb_face;
}
/* Bold italic sans serif face */
fb_face = fb_new_face(nsoption_charp(fb_face_sans_serif_italic_bold),
"sans_serif_italic_bold.ttf",
NETSURF_FB_FONT_SANS_SERIF_ITALIC_BOLD);
if (fb_face == NULL) {
/* seperate italic face unavailabe use the normal weight version */
fb_faces[FB_FACE_SANS_SERIF_ITALIC_BOLD] = fb_faces[FB_FACE_SANS_SERIF];
} else {
fb_faces[FB_FACE_SANS_SERIF_ITALIC_BOLD] = fb_face;
}
/* serif face */
fb_face = fb_new_face(nsoption_charp(fb_face_serif),
"serif.ttf",
NETSURF_FB_FONT_SERIF);
if (fb_face == NULL) {
/* serif face unavailabe use the default */
fb_faces[FB_FACE_SERIF] = fb_faces[FB_FACE_SANS_SERIF];
} else {
fb_faces[FB_FACE_SERIF] = fb_face;
}
/* bold serif face*/
fb_face = fb_new_face(nsoption_charp(fb_face_serif_bold),
"serif_bold.ttf",
NETSURF_FB_FONT_SERIF_BOLD);
if (fb_face == NULL) {
/* bold serif face unavailabe use the normal weight */
fb_faces[FB_FACE_SERIF_BOLD] = fb_faces[FB_FACE_SERIF];
} else {
fb_faces[FB_FACE_SERIF_BOLD] = fb_face;
}
/* monospace face */
fb_face = fb_new_face(nsoption_charp(fb_face_monospace),
"monospace.ttf",
NETSURF_FB_FONT_MONOSPACE);
if (fb_face == NULL) {
/* serif face unavailabe use the default */
fb_faces[FB_FACE_MONOSPACE] = fb_faces[FB_FACE_SANS_SERIF];
} else {
fb_faces[FB_FACE_MONOSPACE] = fb_face;
}
/* bold monospace face*/
fb_face = fb_new_face(nsoption_charp(fb_face_monospace_bold),
"monospace_bold.ttf",
NETSURF_FB_FONT_MONOSPACE_BOLD);
if (fb_face == NULL) {
/* bold serif face unavailabe use the normal weight */
fb_faces[FB_FACE_MONOSPACE_BOLD] = fb_faces[FB_FACE_MONOSPACE];
} else {
fb_faces[FB_FACE_MONOSPACE_BOLD] = fb_face;
}
/* cursive face */
fb_face = fb_new_face(nsoption_charp(fb_face_cursive),
"cursive.ttf",
NETSURF_FB_FONT_CURSIVE);
if (fb_face == NULL) {
/* cursive face unavailabe use the default */
fb_faces[FB_FACE_CURSIVE] = fb_faces[FB_FACE_SANS_SERIF];
} else {
fb_faces[FB_FACE_CURSIVE] = fb_face;
}
/* fantasy face */
fb_face = fb_new_face(nsoption_charp(fb_face_fantasy),
"fantasy.ttf",
NETSURF_FB_FONT_FANTASY);
if (fb_face == NULL) {
/* fantasy face unavailabe use the default */
fb_faces[FB_FACE_FANTASY] = fb_faces[FB_FACE_SANS_SERIF];
} else {
fb_faces[FB_FACE_FANTASY] = fb_face;
}
/* set the default render mode */
if (nsoption_bool(fb_font_monochrome) == true)
ft_load_type = FT_LOAD_MONOCHROME; /* faster but less pretty */
else
ft_load_type = 0;
return true;
}
/* exported interface documented in framebuffer/font.h */
bool fb_font_finalise(void)
{
int i, j;
FTC_Manager_Done(ft_cmanager);
FT_Done_FreeType(library);
for (i = 0; i < FB_FACE_COUNT; i++) {
if (fb_faces[i] == NULL)
continue;
/* Unset any faces that duplicate this one */
for (j = i + 1; j < FB_FACE_COUNT; j++) {
if (fb_faces[i] == fb_faces[j])
fb_faces[j] = NULL;
}
free(fb_faces[i]->fontfile);
free(fb_faces[i]);
fb_faces[i] = NULL;
}
return true;
}
/**
* fill freetype scalar
*/
static void fb_fill_scalar(const plot_font_style_t *fstyle, FTC_Scaler srec)
{
int selected_face = FB_FACE_DEFAULT;
switch (fstyle->family) {
case PLOT_FONT_FAMILY_SERIF:
if (fstyle->weight >= BOLD_WEIGHT) {
selected_face = FB_FACE_SERIF_BOLD;
} else {
selected_face = FB_FACE_SERIF;
}
break;
case PLOT_FONT_FAMILY_MONOSPACE:
if (fstyle->weight >= BOLD_WEIGHT) {
selected_face = FB_FACE_MONOSPACE_BOLD;
} else {
selected_face = FB_FACE_MONOSPACE;
}
break;
case PLOT_FONT_FAMILY_CURSIVE:
selected_face = FB_FACE_CURSIVE;
break;
case PLOT_FONT_FAMILY_FANTASY:
selected_face = FB_FACE_FANTASY;
break;
case PLOT_FONT_FAMILY_SANS_SERIF:
default:
if ((fstyle->flags & FONTF_ITALIC) ||
(fstyle->flags & FONTF_OBLIQUE)) {
if (fstyle->weight >= BOLD_WEIGHT) {
selected_face = FB_FACE_SANS_SERIF_ITALIC_BOLD;
} else {
selected_face = FB_FACE_SANS_SERIF_ITALIC;
}
} else {
if (fstyle->weight >= BOLD_WEIGHT) {
selected_face = FB_FACE_SANS_SERIF_BOLD;
} else {
selected_face = FB_FACE_SANS_SERIF;
}
}
}
srec->face_id = (FTC_FaceID)fb_faces[selected_face];
srec->width = srec->height = (fstyle->size * 64) / PLOT_STYLE_SCALE;
srec->pixel = 0;
srec->x_res = srec->y_res = browser_get_dpi();
}
/* exported interface documented in framebuffer/freetype_font.h */
FT_Glyph fb_getglyph(const plot_font_style_t *fstyle, uint32_t ucs4)
{
FT_UInt glyph_index;
FTC_ScalerRec srec;
FT_Glyph glyph;
FT_Error error;
fb_faceid_t *fb_face;
fb_fill_scalar(fstyle, &srec);
fb_face = (fb_faceid_t *)srec.face_id;
glyph_index = FTC_CMapCache_Lookup(ft_cmap_cache, srec.face_id,
fb_face->cidx, ucs4);
error = FTC_ImageCache_LookupScaler(ft_image_cache,
&srec,
FT_LOAD_RENDER |
FT_LOAD_FORCE_AUTOHINT |
ft_load_type,
glyph_index,
&glyph,
NULL);
if (error != 0)
return NULL;
return glyph;
}
/* exported interface documented in framebuffer/freetype_font.h */
nserror
fb_font_width(const plot_font_style_t *fstyle,
const char *string, size_t length,
int *width)
{
uint32_t ucs4;
size_t nxtchr = 0;
FT_Glyph glyph;
*width = 0;
while (nxtchr < length) {
ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr);
nxtchr = utf8_next(string, length, nxtchr);
glyph = fb_getglyph(fstyle, ucs4);
if (glyph == NULL)
continue;
*width += glyph->advance.x >> 16;
}
return NSERROR_OK;
}
/* exported interface documented in framebuffer/freetype_font.h */
nserror
fb_font_position(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;
FT_Glyph glyph;
int prev_x = 0;
*actual_x = 0;
while (nxtchr < length) {
ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr);
glyph = fb_getglyph(fstyle, ucs4);
if (glyph == NULL)
continue;
*actual_x += glyph->advance.x >> 16;
if (*actual_x > x)
break;
prev_x = *actual_x;
nxtchr = utf8_next(string, length, nxtchr);
}
/* choose nearest of previous and last x */
if (abs(*actual_x - x) > abs(prev_x - x))
*actual_x = prev_x;
*char_offset = nxtchr;
return NSERROR_OK;
}
/**
* 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 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:
*/
Reference in New Issue View Git Blame Copy Permalink