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/*
* Copyright © 2012 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
*/
#define HB_SHAPER icu_le
#define hb_icu_le_shaper_font_data_t PortableFontInstance
#include "hb-shaper-impl-private.hh"
#include "hb-icu-le/PortableFontInstance.h"
#include "layout/loengine.h"
#include "unicode/unistr.h"
#include "hb-icu.h"
/*
* shaper face data
*/
struct hb_icu_le_shaper_face_data_t {};
hb_icu_le_shaper_face_data_t *
_hb_icu_le_shaper_face_data_create (hb_face_t *face HB_UNUSED)
{
return (hb_icu_le_shaper_face_data_t *) HB_SHAPER_DATA_SUCCEEDED;
}
void
_hb_icu_le_shaper_face_data_destroy (hb_icu_le_shaper_face_data_t *data HB_UNUSED)
{
}
/*
* shaper font data
*/
hb_icu_le_shaper_font_data_t *
_hb_icu_le_shaper_font_data_create (hb_font_t *font)
{
LEErrorCode status = LE_NO_ERROR;
hb_icu_le_shaper_font_data_t *data = new PortableFontInstance (font->face,
font->x_scale,
font->y_scale,
status);
if (status != LE_NO_ERROR) {
delete (data);
return NULL;
}
return data;
}
void
_hb_icu_le_shaper_font_data_destroy (hb_icu_le_shaper_font_data_t *data)
{
delete (data);
}
/*
* shaper shape_plan data
*/
struct hb_icu_le_shaper_shape_plan_data_t {};
hb_icu_le_shaper_shape_plan_data_t *
_hb_icu_le_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED,
const hb_feature_t *user_features,
unsigned int num_user_features)
{
return (hb_icu_le_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
}
void
_hb_icu_le_shaper_shape_plan_data_destroy (hb_icu_le_shaper_shape_plan_data_t *data)
{
}
/*
* shaper
*/
hb_bool_t
_hb_icu_le_shape (hb_shape_plan_t *shape_plan,
hb_font_t *font,
hb_buffer_t *buffer,
const hb_feature_t *features,
unsigned int num_features)
{
LEFontInstance *font_instance = HB_SHAPER_DATA_GET (font);
le_int32 script_code = hb_icu_script_from_script (shape_plan->props.script);
le_int32 language_code = -1 /* TODO */;
le_int32 typography_flags = 3; /* Needed for ligatures and kerning */
LEErrorCode status = LE_NO_ERROR;
le_engine *le = le_create ((const le_font *) font_instance,
script_code,
language_code,
typography_flags,
&status);
if (status != LE_NO_ERROR)
{ le_close (le); return false; }
retry:
unsigned int scratch_size;
char *scratch = (char *) buffer->get_scratch_buffer (&scratch_size);
#define ALLOCATE_ARRAY(Type, name, len) \
Type *name = (Type *) scratch; \
scratch += (len) * sizeof ((name)[0]); \
scratch_size -= (len) * sizeof ((name)[0]);
ALLOCATE_ARRAY (LEUnicode, chars, buffer->len);
ALLOCATE_ARRAY (unsigned int, clusters, buffer->len);
/* XXX Use UTF-16 decoder! */
for (unsigned int i = 0; i < buffer->len; i++) {
chars[i] = buffer->info[i].codepoint;
clusters[i] = buffer->info[i].cluster;
}
unsigned int glyph_count = le_layoutChars (le,
chars,
0,
buffer->len,
buffer->len,
HB_DIRECTION_IS_BACKWARD (buffer->props.direction),
0., 0.,
&status);
if (status != LE_NO_ERROR)
{ le_close (le); return false; }
unsigned int num_glyphs = scratch_size / (sizeof (LEGlyphID) +
sizeof (le_int32) +
sizeof (float) * 2);
if (unlikely (glyph_count >= num_glyphs || glyph_count > buffer->allocated)) {
buffer->ensure (buffer->allocated * 2);
if (buffer->in_error)
{ le_close (le); return false; }
goto retry;
}
ALLOCATE_ARRAY (LEGlyphID, glyphs, glyph_count);
ALLOCATE_ARRAY (le_int32, indices, glyph_count);
ALLOCATE_ARRAY (float, positions, glyph_count * 2 + 2);
le_getGlyphs (le, glyphs, &status);
le_getCharIndices (le, indices, &status);
le_getGlyphPositions (le, positions, &status);
#undef ALLOCATE_ARRAY
/* Ok, we've got everything we need, now compose output buffer,
* very, *very*, carefully! */
unsigned int j = 0;
hb_glyph_info_t *info = buffer->info;
for (unsigned int i = 0; i < glyph_count; i++)
{
if (glyphs[i] >= 0xFFFE)
continue;
info[j].codepoint = glyphs[i];
info[j].cluster = clusters[indices[i]];
/* icu-le doesn't seem to have separate advance values. */
info[j].mask = positions[2 * i + 2] - positions[2 * i];
info[j].var1.u32 = 0;
info[j].var2.u32 = -positions[2 * i + 1];
j++;
}
buffer->len = j;
buffer->clear_positions ();
for (unsigned int i = 0; i < buffer->len; i++) {
hb_glyph_info_t *info = &buffer->info[i];
hb_glyph_position_t *pos = &buffer->pos[i];
/* TODO vertical */
pos->x_advance = info->mask;
pos->x_offset = info->var1.u32;
pos->y_offset = info->var2.u32;
}
le_close (le);
return true;
}
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