diff options
Diffstat (limited to 'framebuffer/font_freetype.c')
-rw-r--r-- | framebuffer/font_freetype.c | 477 |
1 files changed, 477 insertions, 0 deletions
diff --git a/framebuffer/font_freetype.c b/framebuffer/font_freetype.c new file mode 100644 index 000000000..a4bc7868b --- /dev/null +++ b/framebuffer/font_freetype.c @@ -0,0 +1,477 @@ +/* + * 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 <freetype/ftcache.h> + +#include "css/css.h" +#include "render/font.h" +#include "utils/utf8.h" +#include "utils/log.h" +#include "desktop/options.h" + +#include "framebuffer/gui.h" +#include "framebuffer/font.h" +#include "framebuffer/options.h" +#include "framebuffer/findfile.h" + +#define VERA_PATH "/usr/share/fonts/truetype/ttf-bitstream-vera/" + +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; + +/* defines for accesing the faces */ +#define FB_FACE_DEFAULT 0 + +#define FB_FACE_SANS_SERIF 0 +#define FB_FACE_SANS_SERIF_BOLD 1 +#define FB_FACE_SANS_SERIF_ITALIC 2 +#define FB_FACE_SANS_SERIF_ITALIC_BOLD 3 +#define FB_FACE_MONOSPACE 4 +#define FB_FACE_SERIF 5 +#define FB_FACE_SERIF_BOLD 6 + +#define FB_FACE_COUNT 7 + +static fb_faceid_t *fb_faces[FB_FACE_COUNT]; + + +utf8_convert_ret utf8_to_local_encoding(const char *string, + size_t len, + char **result) +{ + return utf8_to_enc(string, "UTF-8", len, result); +} + +/* 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)\n", error)); + } else { + + error = FT_Select_Charmap(*face, FT_ENCODING_UNICODE); + if (error) { + LOG(("Could not select charmap (code %d)\n", 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\n", 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 *fontfile) +{ + 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 { + fb_find_resource(buf, resname, fontfile); + 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)\n", fontfile, error)); + free(newf); + newf = fb_faces[FB_FACE_DEFAULT]; /* use default */ + } + + return newf; +} + +/* initialise font handling */ +bool fb_font_init(void) +{ + FT_Error error; + FT_ULong max_cache_size; + FT_UInt max_faces = 6; + + /* freetype library initialise */ + error = FT_Init_FreeType( &library ); + if (error) { + LOG(("Freetype could not initialised (code %d)\n", error)); + return false; + } + + max_cache_size = 2 * 1024 *1024; /* 2MB should be enough */ + + /* 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)\n", 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); + + fb_faces[FB_FACE_SANS_SERIF] = NULL; + fb_faces[FB_FACE_SANS_SERIF] = + fb_new_face(option_fb_face_sans_serif, + "sans_serif.ttf", + VERA_PATH"Vera.ttf"); + if (fb_faces[FB_FACE_SANS_SERIF] == NULL) { + LOG(("Could not find default font (code %d)\n", error)); + FTC_Manager_Done(ft_cmanager ); + FT_Done_FreeType(library); + return false; + } + + fb_faces[FB_FACE_SANS_SERIF_BOLD] = + fb_new_face(option_fb_face_sans_serif_bold, + "sans_serif_bold.ttf", + VERA_PATH"VeraBd.ttf"); + + fb_faces[FB_FACE_SANS_SERIF_ITALIC] = + fb_new_face(option_fb_face_sans_serif_italic, + "sans_serif_italic.ttf", + VERA_PATH"VeraIt.ttf"); + + fb_faces[FB_FACE_SANS_SERIF_ITALIC_BOLD] = + fb_new_face(option_fb_face_sans_serif_italic_bold, + "sans_serif_italic_bold.ttf", + VERA_PATH"VeraBI.ttf"); + + fb_faces[FB_FACE_MONOSPACE] = + fb_new_face(option_fb_face_monospace, + "monospace.ttf", + VERA_PATH"VeraMono.ttf"); + + fb_faces[FB_FACE_SERIF] = + fb_new_face(option_fb_face_serif, + "serif.ttf", + VERA_PATH"VeraSe.ttf"); + + fb_faces[FB_FACE_SERIF_BOLD] = + fb_new_face(option_fb_face_serif_bold, + "serif_bold.ttf", + VERA_PATH"VeraSeBd.ttf"); + + /* set the default render mode */ + if (option_fb_font_monochrome == true) + ft_load_type = FT_LOAD_MONOCHROME; /* faster but less pretty */ + else + ft_load_type = 0; + + return true; +} + +bool fb_font_finalise(void) +{ + FTC_Manager_Done(ft_cmanager ); + FT_Done_FreeType(library); + return true; +} + +static void fb_fill_scalar(const struct css_style *style, FTC_Scaler srec) +{ + int selected_face = FB_FACE_DEFAULT; + + switch (style->font_family) { + /* + case CSS_FONT_FAMILY_CURSIVE: + break; + case CSS_FONT_FAMILY_FANTASY: + break; + */ + case CSS_FONT_FAMILY_SERIF: + switch (style->font_weight) { + case CSS_FONT_WEIGHT_700: + case CSS_FONT_WEIGHT_800: + case CSS_FONT_WEIGHT_900: + case CSS_FONT_WEIGHT_BOLD: + selected_face = FB_FACE_SERIF_BOLD; + break; + + case CSS_FONT_WEIGHT_NORMAL: + default: + selected_face = FB_FACE_SERIF; + break; + } + + break; + + case CSS_FONT_FAMILY_MONOSPACE: + selected_face = FB_FACE_MONOSPACE; + break; + + case CSS_FONT_FAMILY_SANS_SERIF: + default: + switch (style->font_style) { + case CSS_FONT_STYLE_ITALIC: + switch (style->font_weight) { + case CSS_FONT_WEIGHT_700: + case CSS_FONT_WEIGHT_800: + case CSS_FONT_WEIGHT_900: + case CSS_FONT_WEIGHT_BOLD: + selected_face = FB_FACE_SANS_SERIF_ITALIC_BOLD; + break; + + case CSS_FONT_WEIGHT_NORMAL: + default: + selected_face = FB_FACE_SANS_SERIF_ITALIC; + break; + } + break; + + default: + switch (style->font_weight) { + case CSS_FONT_WEIGHT_700: + case CSS_FONT_WEIGHT_800: + case CSS_FONT_WEIGHT_900: + case CSS_FONT_WEIGHT_BOLD: + selected_face = FB_FACE_SANS_SERIF_BOLD; + break; + + case CSS_FONT_WEIGHT_NORMAL: + default: + selected_face = FB_FACE_SANS_SERIF; + break; + } + break; + } + } + + srec->face_id = (FTC_FaceID)fb_faces[selected_face]; + + if (style->font_size.value.length.unit == CSS_UNIT_PX) { + srec->width = srec->height = style->font_size.value.length.value; + srec->pixel = 1; + } else { + srec->width = srec->height = + css_len2pt(&style->font_size.value.length, style) * 64; + srec->pixel = 0; + + srec->x_res = srec->y_res = 72; + } + +} + +FT_Glyph fb_getglyph(const struct css_style *style, uint32_t ucs4) +{ + FT_UInt glyph_index; + FTC_ScalerRec srec; + FT_Glyph glyph; + FT_Error error; + fb_faceid_t *fb_face; + + fb_fill_scalar(style, &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); + + return glyph; +} + + +/** + * Measure the width of a string. + * + * \param style css_style for this text, with style->font_size.size == + * CSS_FONT_SIZE_LENGTH + * \param string UTF-8 string to measure + * \param length length of string + * \param width updated to width of string[0..length) + * \return true on success, false on error and error reported + */ +static bool nsfont_width(const struct css_style *style, + 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(style, ucs4); + if (glyph == NULL) + continue; + + *width += glyph->advance.x >> 16; + } + + return true; +} + +/** + * Find the position in a string where an x coordinate falls. + * + * \param style css_style for this text, with style->font_size.size == + * CSS_FONT_SIZE_LENGTH + * \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 struct css_style *style, + 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; + + *actual_x = 0; + while (nxtchr < length) { + ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr); + + glyph = fb_getglyph(style, ucs4); + if (glyph == NULL) + continue; + + *actual_x += glyph->advance.x >> 16; + if (*actual_x > x) + break; + + nxtchr = utf8_next(string, length, nxtchr); + } + + *char_offset = nxtchr; + return true; +} + + +/** + * Find where to split a string to make it fit a width. + * + * \param style css_style for this text, with style->font_size.size == + * CSS_FONT_SIZE_LENGTH + * \param string UTF-8 string to measure + * \param length length of string + * \param x width available + * \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 + * + * On exit, [char_offset == 0 || + * string[char_offset] == ' ' || + * char_offset == length] + */ + +static bool nsfont_split(const struct css_style *style, + 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(style, 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) { + /* string has exceeded available width 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 +}; + +/* + * Local Variables: + * c-basic-offset:8 + * End: + */ |