harfbuzz/util/hb-view.cc

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