static void
cairo_truetype_font_remap_composite_glyph (cairo_truetype_font_t *font,
unsigned char *buffer)
{
tt_glyph_data_t *glyph_data;
tt_composite_glyph_t *composite_glyph;
int num_args;
int has_more_components;
unsigned short flags;
unsigned short index;
glyph_data = (tt_glyph_data_t *) buffer;
if ((int16_t)be16_to_cpu (glyph_data->num_contours) >= 0)
return;
composite_glyph = &glyph_data->glyph;
do {
flags = be16_to_cpu (composite_glyph->flags);
has_more_components = flags & TT_MORE_COMPONENTS;
index = cairo_truetype_font_use_glyph (font, be16_to_cpu (composite_glyph->index));
composite_glyph->index = cpu_to_be16 (index);
num_args = 1;
if (flags & TT_ARG_1_AND_2_ARE_WORDS)
num_args += 1;
if (flags & TT_WE_HAVE_A_SCALE)
num_args += 1;
else if (flags & TT_WE_HAVE_AN_X_AND_Y_SCALE)
num_args += 2;
else if (flags & TT_WE_HAVE_A_TWO_BY_TWO)
num_args += 3;
composite_glyph = (tt_composite_glyph_t *) &(composite_glyph->args[num_args]);
} while (has_more_components);
}
static cairo_status_t
cairo_truetype_font_remap_composite_glyph (cairo_truetype_font_t *font,
unsigned char *buffer,
unsigned long size)
{
tt_glyph_data_t *glyph_data;
tt_composite_glyph_t *composite_glyph;
int num_args;
int has_more_components;
unsigned short flags;
unsigned short index;
cairo_status_t status;
unsigned char *end = buffer + size;
if (font->status)
return font->status;
glyph_data = (tt_glyph_data_t *) buffer;
if ((unsigned char *)(&glyph_data->data) >= end)
return CAIRO_INT_STATUS_UNSUPPORTED;
if ((int16_t)be16_to_cpu (glyph_data->num_contours) >= 0)
return CAIRO_STATUS_SUCCESS;
composite_glyph = &glyph_data->glyph;
do {
if ((unsigned char *)(&composite_glyph->args[1]) > end)
return CAIRO_INT_STATUS_UNSUPPORTED;
flags = be16_to_cpu (composite_glyph->flags);
has_more_components = flags & TT_MORE_COMPONENTS;
status = cairo_truetype_font_use_glyph (font, be16_to_cpu (composite_glyph->index), &index);
if (unlikely (status))
return status;
composite_glyph->index = cpu_to_be16 (index);
num_args = 1;
if (flags & TT_ARG_1_AND_2_ARE_WORDS)
num_args += 1;
if (flags & TT_WE_HAVE_A_SCALE)
num_args += 1;
else if (flags & TT_WE_HAVE_AN_X_AND_Y_SCALE)
num_args += 2;
else if (flags & TT_WE_HAVE_A_TWO_BY_TWO)
num_args += 4;
composite_glyph = (tt_composite_glyph_t *) &(composite_glyph->args[num_args]);
} while (has_more_components);
return CAIRO_STATUS_SUCCESS;
}
cairo_status_t
_cairo_truetype_subset_init (cairo_truetype_subset_t *truetype_subset,
cairo_scaled_font_subset_t *font_subset)
{
cairo_truetype_font_t *font = NULL;
cairo_status_t status;
const char *data = NULL; /* squelch bogus compiler warning */
unsigned long length = 0; /* squelch bogus compiler warning */
unsigned long offsets_length;
unsigned int i;
const unsigned long *string_offsets = NULL;
unsigned long num_strings = 0;
status = _cairo_truetype_font_create (font_subset, &font);
if (unlikely (status))
return status;
for (i = 0; i < font->scaled_font_subset->num_glyphs; i++) {
unsigned short parent_glyph = font->scaled_font_subset->glyphs[i];
status = cairo_truetype_font_use_glyph (font, parent_glyph, &parent_glyph);
if (unlikely (status))
goto fail1;
}
cairo_truetype_font_create_truetype_table_list (font);
status = cairo_truetype_font_generate (font, &data, &length,
&string_offsets, &num_strings);
if (unlikely (status))
goto fail1;
truetype_subset->ps_name = strdup (font->base.ps_name);
if (unlikely (truetype_subset->ps_name == NULL)) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto fail1;
}
if (font->base.font_name != NULL) {
truetype_subset->font_name = strdup (font->base.font_name);
if (unlikely (truetype_subset->font_name == NULL)) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto fail2;
}
} else {
truetype_subset->font_name = NULL;
}
/* The widths array returned must contain only widths for the
* glyphs in font_subset. Any subglyphs appended after
* font_subset->num_glyphs are omitted. */
truetype_subset->widths = calloc (sizeof (double),
font->scaled_font_subset->num_glyphs);
if (unlikely (truetype_subset->widths == NULL)) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto fail3;
}
for (i = 0; i < font->scaled_font_subset->num_glyphs; i++)
truetype_subset->widths[i] = (double)font->base.widths[i]/font->base.units_per_em;
truetype_subset->x_min = (double)font->base.x_min/font->base.units_per_em;
truetype_subset->y_min = (double)font->base.y_min/font->base.units_per_em;
truetype_subset->x_max = (double)font->base.x_max/font->base.units_per_em;
truetype_subset->y_max = (double)font->base.y_max/font->base.units_per_em;
truetype_subset->ascent = (double)font->base.ascent/font->base.units_per_em;
truetype_subset->descent = (double)font->base.descent/font->base.units_per_em;
if (length) {
truetype_subset->data = malloc (length);
if (unlikely (truetype_subset->data == NULL)) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto fail4;
}
memcpy (truetype_subset->data, data, length);
} else
truetype_subset->data = NULL;
truetype_subset->data_length = length;
if (num_strings) {
offsets_length = num_strings * sizeof (unsigned long);
truetype_subset->string_offsets = malloc (offsets_length);
if (unlikely (truetype_subset->string_offsets == NULL)) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto fail5;
}
memcpy (truetype_subset->string_offsets, string_offsets, offsets_length);
truetype_subset->num_string_offsets = num_strings;
} else {
truetype_subset->string_offsets = NULL;
truetype_subset->num_string_offsets = 0;
}
cairo_truetype_font_destroy (font);
return CAIRO_STATUS_SUCCESS;
fail5:
free (truetype_subset->data);
fail4:
free (truetype_subset->widths);
fail3:
if (truetype_subset->font_name)
free (truetype_subset->font_name);
fail2:
free (truetype_subset->ps_name);
fail1:
cairo_truetype_font_destroy (font);
return status;
}
