HarfBuzz text shaping engine
http://harfbuzz.github.io/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
259 lines
7.1 KiB
259 lines
7.1 KiB
/* |
|
* 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 |
|
*/ |
|
|
|
#include "common.hh" |
|
|
|
|
|
#include <cairo-ft.h> |
|
#include <hb-ft.h> |
|
|
|
#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, |
|
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 (); |
|
|
|
|
|
hb_buffer_add_utf8 (hb_buffer, utf8, len, 0, len); |
|
|
|
if (!shape_opts->shape (hb_font, hb_buffer)) |
|
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; |
|
sscanf (view_opts->back + (*view_opts->back=='#'), "%2x%2x%2x%2x", &br, &bg, &bb, &ba); |
|
fr = fg = fb = 0; fa = 255; |
|
sscanf (view_opts->fore + (*view_opts->fore=='#'), "%2x%2x%2x%2x", &fr, &fg, &fb, &fa); |
|
|
|
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; |
|
|
|
const char *end, *p = shape_opts->text; |
|
double x, y; |
|
|
|
cr= create_context (); |
|
|
|
cairo_set_font_size (cr, font_opts->font_size); |
|
cairo_font_extents (cr, &font_extents); |
|
|
|
height = 0; |
|
width = 0; |
|
|
|
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); |
|
|
|
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); |
|
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); |
|
|
|
height = y + view_opts->margin.b; |
|
width += view_opts->margin.l + view_opts->margin.r; |
|
|
|
cairo_destroy (cr); |
|
} |
|
|
|
|
|
|
|
int |
|
main (int argc, char **argv) |
|
{ |
|
static FT_Library ft_library; |
|
static FT_Face ft_face; |
|
cairo_status_t status; |
|
|
|
setlocale (LC_ALL, ""); |
|
|
|
parse_options (argc, argv); |
|
|
|
FT_Init_FreeType (&ft_library); |
|
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 (); |
|
|
|
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) { |
|
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; |
|
}
|
|
|