273 lines
7.6 KiB
C++
273 lines
7.6 KiB
C++
/*
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* Copyright © 2010 Behdad Esfahbod
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* Copyright © 2011 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod
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*/
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#include "common.hh"
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#include <cairo-ft.h>
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#include <hb-ft.h>
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#include "options.hh"
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/* Ugh, global vars. Ugly, but does the job */
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static int width = 0;
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static int height = 0;
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static cairo_surface_t *surface = NULL;
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static cairo_pattern_t *fore_pattern = NULL;
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static cairo_pattern_t *back_pattern = NULL;
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static cairo_font_face_t *cairo_face;
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static cairo_glyph_t *
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_hb_cr_text_glyphs (cairo_t *cr,
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const char *utf8, int len,
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unsigned int *pnum_glyphs)
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{
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cairo_scaled_font_t *scaled_font = cairo_get_scaled_font (cr);
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FT_Face ft_face = cairo_ft_scaled_font_lock_face (scaled_font);
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hb_font_t *hb_font = hb_ft_font_create (ft_face, NULL);
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hb_buffer_t *hb_buffer;
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cairo_glyph_t *cairo_glyphs;
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hb_glyph_info_t *hb_glyph;
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hb_glyph_position_t *hb_position;
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unsigned int num_glyphs, i;
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hb_position_t x, y;
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hb_buffer = hb_buffer_create ();
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if (shape_opts->direction)
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hb_buffer_set_direction (hb_buffer, hb_direction_from_string (shape_opts->direction));
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if (shape_opts->script)
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hb_buffer_set_script (hb_buffer, hb_script_from_string (shape_opts->script));
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if (shape_opts->language)
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hb_buffer_set_language (hb_buffer, hb_language_from_string (shape_opts->language));
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if (len < 0)
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len = strlen (utf8);
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hb_buffer_add_utf8 (hb_buffer, utf8, len, 0, len);
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if (!hb_shape_full (hb_font, hb_buffer, shape_opts->features, shape_opts->num_features, NULL, shape_opts->shapers))
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fail ("All shapers failed");
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num_glyphs = hb_buffer_get_length (hb_buffer);
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hb_glyph = hb_buffer_get_glyph_infos (hb_buffer, NULL);
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hb_position = hb_buffer_get_glyph_positions (hb_buffer, NULL);
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cairo_glyphs = cairo_glyph_allocate (num_glyphs);
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x = 0;
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y = 0;
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for (i = 0; i < num_glyphs; i++)
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{
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cairo_glyphs[i].index = hb_glyph->codepoint;
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cairo_glyphs[i].x = ( hb_position->x_offset + x) * (1./64);
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cairo_glyphs[i].y = (-hb_position->y_offset + y) * (1./64);
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x += hb_position->x_advance;
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y += -hb_position->y_advance;
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hb_glyph++;
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hb_position++;
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}
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hb_buffer_destroy (hb_buffer);
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hb_font_destroy (hb_font);
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cairo_ft_scaled_font_unlock_face (scaled_font);
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if (pnum_glyphs)
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*pnum_glyphs = num_glyphs;
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return cairo_glyphs;
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}
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static cairo_t *
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create_context (void)
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{
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cairo_t *cr;
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unsigned int fr, fg, fb, fa, br, bg, bb, ba;
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if (surface)
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cairo_surface_destroy (surface);
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if (back_pattern)
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cairo_pattern_destroy (back_pattern);
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if (fore_pattern)
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cairo_pattern_destroy (fore_pattern);
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br = bg = bb = ba = 255;
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sscanf (view_opts->back + (*view_opts->back=='#'), "%2x%2x%2x%2x", &br, &bg, &bb, &ba);
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fr = fg = fb = 0; fa = 255;
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sscanf (view_opts->fore + (*view_opts->fore=='#'), "%2x%2x%2x%2x", &fr, &fg, &fb, &fa);
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if (!view_opts->annotate && ba == 255 && fa == 255 && br == bg && bg == bb && fr == fg && fg == fb) {
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/* grayscale. use A8 surface */
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surface = cairo_image_surface_create (CAIRO_FORMAT_A8, width, height);
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cr = cairo_create (surface);
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cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
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cairo_set_source_rgba (cr, 1., 1., 1., br / 255.);
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cairo_paint (cr);
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back_pattern = cairo_pattern_reference (cairo_get_source (cr));
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cairo_set_source_rgba (cr, 1., 1., 1., fr / 255.);
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fore_pattern = cairo_pattern_reference (cairo_get_source (cr));
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} else {
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/* color. use (A)RGB surface */
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if (ba != 255)
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surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
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else
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surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, width, height);
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cr = cairo_create (surface);
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cairo_set_source_rgba (cr, br / 255., bg / 255., bb / 255., ba / 255.);
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cairo_paint (cr);
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back_pattern = cairo_pattern_reference (cairo_get_source (cr));
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cairo_set_source_rgba (cr, fr / 255., fg / 255., fb / 255., fa / 255.);
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fore_pattern = cairo_pattern_reference (cairo_get_source (cr));
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}
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cairo_set_font_face (cr, cairo_face);
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return cr;
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}
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static void
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draw (void)
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{
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cairo_t *cr;
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cairo_font_extents_t font_extents;
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cairo_glyph_t *glyphs = NULL;
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unsigned int num_glyphs = 0;
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const char *end, *p = shape_opts->text;
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double x, y;
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cr= create_context ();
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cairo_set_font_size (cr, font_opts->font_size);
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cairo_font_extents (cr, &font_extents);
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height = 0;
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width = 0;
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x = view_opts->margin.l;
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y = view_opts->margin.t;
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do {
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cairo_text_extents_t extents;
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end = strchr (p, '\n');
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if (!end)
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end = p + strlen (p);
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if (p != shape_opts->text)
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y += view_opts->line_space;
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if (p != end) {
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glyphs = _hb_cr_text_glyphs (cr, p, end - p, &num_glyphs);
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cairo_glyph_extents (cr, glyphs, num_glyphs, &extents);
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y += ceil (font_extents.ascent);
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width = MAX (width, extents.x_advance);
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cairo_save (cr);
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cairo_translate (cr, x, y);
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if (view_opts->annotate) {
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unsigned int i;
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cairo_save (cr);
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/* Draw actual glyph origins */
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cairo_set_source_rgba (cr, 1., 0., 0., .5);
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cairo_set_line_width (cr, 5);
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cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
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for (i = 0; i < num_glyphs; i++) {
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cairo_move_to (cr, glyphs[i].x, glyphs[i].y);
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cairo_rel_line_to (cr, 0, 0);
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}
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cairo_stroke (cr);
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cairo_restore (cr);
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}
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cairo_show_glyphs (cr, glyphs, num_glyphs);
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cairo_restore (cr);
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y += ceil (font_extents.height - ceil (font_extents.ascent));
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cairo_glyph_free (glyphs);
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}
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p = end + 1;
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} while (*end);
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height = y + view_opts->margin.b;
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width += view_opts->margin.l + view_opts->margin.r;
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cairo_destroy (cr);
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}
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int
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main (int argc, char **argv)
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{
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static FT_Library ft_library;
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static FT_Face ft_face;
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cairo_status_t status;
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setlocale (LC_ALL, "");
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parse_options (argc, argv);
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FT_Init_FreeType (&ft_library);
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if (FT_New_Face (ft_library, font_opts->font_file, font_opts->face_index, &ft_face)) {
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fprintf (stderr, "Failed to open font file `%s'\n", font_opts->font_file);
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exit (1);
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}
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cairo_face = cairo_ft_font_face_create_for_ft_face (ft_face, 0);
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draw ();
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draw ();
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status = cairo_surface_write_to_png (surface, out_file);
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if (status != CAIRO_STATUS_SUCCESS) {
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fprintf (stderr, "Failed to write output file `%s': %s\n",
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out_file, cairo_status_to_string (status));
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exit (1);
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}
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if (debug) {
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free (shape_opts->features);
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g_free (shape_opts->shapers);
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cairo_pattern_destroy (fore_pattern);
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cairo_pattern_destroy (back_pattern);
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cairo_surface_destroy (surface);
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cairo_font_face_destroy (cairo_face);
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cairo_debug_reset_static_data ();
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FT_Done_Face (ft_face);
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FT_Done_FreeType (ft_library);
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}
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return 0;
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}
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