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-rw-r--r--framebuffer/font_freetype.c477
1 files changed, 477 insertions, 0 deletions
diff --git a/framebuffer/font_freetype.c b/framebuffer/font_freetype.c
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+++ b/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 <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:
+ */