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authorVincent Sanders <vince@kyllikki.org>2016-05-05 22:28:51 +0100
committerVincent Sanders <vince@kyllikki.org>2016-05-15 13:44:34 +0100
commitd21447d096a320a08b3efb2b8768fad0dcdcfd64 (patch)
tree1a83814b7c9e94b2f13c473261f23dd3a17dee64 /framebuffer/font_freetype.c
parent2cbb337756d9af5bda4d594964d446439f602551 (diff)
downloadnetsurf-d21447d096a320a08b3efb2b8768fad0dcdcfd64.tar.gz
netsurf-d21447d096a320a08b3efb2b8768fad0dcdcfd64.tar.bz2
move frontends into sub directory
Diffstat (limited to 'framebuffer/font_freetype.c')
-rw-r--r--framebuffer/font_freetype.c566
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diff --git a/framebuffer/font_freetype.c b/framebuffer/font_freetype.c
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--- a/framebuffer/font_freetype.c
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-/*
- * 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 <inttypes.h>
-#include <assert.h>
-
-#include <ft2build.h>
-#include FT_CACHE_H
-
-#include "utils/filepath.h"
-#include "utils/utf8.h"
-#include "utils/log.h"
-#include "utils/nsoption.h"
-#include "desktop/gui_utf8.h"
-#include "desktop/gui_layout.h"
-#include "desktop/browser.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) {
- LOG("Could not find font (code %d)", error);
- } else {
-
- error = FT_Select_Charmap(*face, FT_ENCODING_UNICODE);
- if (error) {
- LOG("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;
- }
- }
- }
- }
- LOG("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) {
- LOG("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) {
- LOG("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) {
- LOG("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. */
- LOG("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) / FONT_SIZE_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 true;
-}
-
-
-/* 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 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 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 true;
- }
-
- nxtchr = utf8_next(string, length, nxtchr);
- }
-
- *char_offset = nxtchr;
-
- return true;
-}
-
-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:
- */