/*
* 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 old
#define hb_old_shaper_face_data_t HB_FaceRec_
#define hb_old_shaper_font_data_t HB_Font_
#include "hb-shaper-impl-private.hh"
#include <harfbuzz.h>
#ifndef HB_DEBUG_OLD
#define HB_DEBUG_OLD (HB_DEBUG+0)
#endif
static HB_Script
hb_old_script_from_script (hb_script_t script)
{
switch ((hb_tag_t) script)
{
default:
case HB_SCRIPT_COMMON: return HB_Script_Common;
case HB_SCRIPT_GREEK: return HB_Script_Greek;
case HB_SCRIPT_CYRILLIC: return HB_Script_Cyrillic;
case HB_SCRIPT_ARMENIAN: return HB_Script_Armenian;
case HB_SCRIPT_HEBREW: return HB_Script_Hebrew;
case HB_SCRIPT_ARABIC: return HB_Script_Arabic;
case HB_SCRIPT_SYRIAC: return HB_Script_Syriac;
case HB_SCRIPT_THAANA: return HB_Script_Thaana;
case HB_SCRIPT_DEVANAGARI: return HB_Script_Devanagari;
case HB_SCRIPT_BENGALI: return HB_Script_Bengali;
case HB_SCRIPT_GURMUKHI: return HB_Script_Gurmukhi;
case HB_SCRIPT_GUJARATI: return HB_Script_Gujarati;
case HB_SCRIPT_ORIYA: return HB_Script_Oriya;
case HB_SCRIPT_TAMIL: return HB_Script_Tamil;
case HB_SCRIPT_TELUGU: return HB_Script_Telugu;
case HB_SCRIPT_KANNADA: return HB_Script_Kannada;
case HB_SCRIPT_MALAYALAM: return HB_Script_Malayalam;
case HB_SCRIPT_SINHALA: return HB_Script_Sinhala;
case HB_SCRIPT_THAI: return HB_Script_Thai;
case HB_SCRIPT_LAO: return HB_Script_Lao;
case HB_SCRIPT_TIBETAN: return HB_Script_Tibetan;
case HB_SCRIPT_MYANMAR: return HB_Script_Myanmar;
case HB_SCRIPT_GEORGIAN: return HB_Script_Georgian;
case HB_SCRIPT_HANGUL: return HB_Script_Hangul;
case HB_SCRIPT_OGHAM: return HB_Script_Ogham;
case HB_SCRIPT_RUNIC: return HB_Script_Runic;
case HB_SCRIPT_KHMER: return HB_Script_Khmer;
case HB_SCRIPT_NKO: return HB_Script_Nko;
case HB_SCRIPT_INHERITED: return HB_Script_Inherited;
}
}
static HB_Bool
hb_old_convertStringToGlyphIndices (HB_Font old_font,
const HB_UChar16 *string,
hb_uint32 length,
HB_Glyph *glyphs,
hb_uint32 *numGlyphs,
HB_Bool rightToLeft)
{
hb_font_t *font = (hb_font_t *) old_font->userData;
for (unsigned int i = 0; i < length; i++)
{
hb_codepoint_t u;
/* XXX Handle UTF-16. Ugh */
u = string[i];
if (rightToLeft)
u = hb_unicode_funcs_get_default ()->mirroring (u);
font->get_glyph (u, 0, &u); /* TODO Variation selectors */
glyphs[i] = u;
}
*numGlyphs = length; /* XXX */
return true;
}
static void
hb_old_getGlyphAdvances (HB_Font old_font,
const HB_Glyph *glyphs,
hb_uint32 numGlyphs,
HB_Fixed *advances,
int flags /*HB_ShaperFlag*/ HB_UNUSED)
{
hb_font_t *font = (hb_font_t *) old_font->userData;
for (unsigned int i = 0; i < numGlyphs; i++)
advances[i] = font->get_glyph_h_advance (glyphs[i]);
}
static HB_Bool
hb_old_canRender (HB_Font old_font,
const HB_UChar16 *string,
hb_uint32 length)
{
return true; /* TODO */
}
static HB_Error
hb_old_getPointInOutline (HB_Font old_font,
HB_Glyph glyph,
int flags /*HB_ShaperFlag*/,
hb_uint32 point,
HB_Fixed *xpos,
HB_Fixed *ypos,
hb_uint32 *nPoints)
{
return HB_Err_Ok; /* TODO */
}
static void
hb_old_getGlyphMetrics (HB_Font old_font,
HB_Glyph glyph,
HB_GlyphMetrics *metrics)
{
hb_font_t *font = (hb_font_t *) old_font->userData;
hb_glyph_extents_t extents;
font->get_glyph_extents (glyph, &extents);
metrics->x = extents.x_bearing;
metrics->y = extents.y_bearing;
metrics->width = extents.width;
metrics->height = extents.height;
metrics->xOffset = font->get_glyph_h_advance (glyph);
metrics->yOffset = 0;
}
static HB_Fixed
hb_old_getFontMetric (HB_Font old_font,
HB_FontMetric metric)
{
hb_font_t *font = (hb_font_t *) old_font->userData;
switch (metric)
{
case HB_FontAscent:
return font->y_scale; /* XXX We don't have ascent data yet. */
default:
return 0;
}
}
static const HB_FontClass hb_old_font_class = {
hb_old_convertStringToGlyphIndices,
hb_old_getGlyphAdvances,
hb_old_canRender,
hb_old_getPointInOutline,
hb_old_getGlyphMetrics,
hb_old_getFontMetric
};
static HB_Error
table_func (void *font, HB_Tag tag, HB_Byte *buffer, HB_UInt *length)
{
hb_face_t *face = (hb_face_t *) font;
hb_blob_t *blob = face->reference_table ((hb_tag_t) tag);
unsigned int capacity = *length;
*length = hb_blob_get_length (blob);
memcpy (buffer, hb_blob_get_data (blob, NULL), MIN (capacity, *length));
hb_blob_destroy (blob);
return HB_Err_Ok;
}
/*
* shaper face data
*/
hb_old_shaper_face_data_t *
_hb_old_shaper_face_data_create (hb_face_t *face)
{
return HB_NewFace (face, table_func);
}
void
_hb_old_shaper_face_data_destroy (hb_old_shaper_face_data_t *data)
{
HB_FreeFace (data);
}
/*
* shaper font data
*/
hb_old_shaper_font_data_t *
_hb_old_shaper_font_data_create (hb_font_t *font)
{
HB_FontRec *data = (HB_FontRec *) calloc (1, sizeof (HB_FontRec));
if (unlikely (!data)) {
DEBUG_MSG (OLD, font, "malloc()ing HB_Font failed");
return NULL;
}
data->klass = &hb_old_font_class;
data->x_ppem = font->x_ppem;
data->y_ppem = font->y_ppem;
data->x_scale = font->x_scale; /* XXX */
data->y_scale = font->y_scale; /* XXX */
data->userData = font;
return data;
}
void
_hb_old_shaper_font_data_destroy (hb_old_shaper_font_data_t *data)
{
free (data);
}
/*
* shaper shape_plan data
*/
struct hb_old_shaper_shape_plan_data_t {};
hb_old_shaper_shape_plan_data_t *
_hb_old_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED,
const hb_feature_t *user_features HB_UNUSED,
unsigned int num_user_features HB_UNUSED)
{
return (hb_old_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
}
void
_hb_old_shaper_shape_plan_data_destroy (hb_old_shaper_shape_plan_data_t *data HB_UNUSED)
{
}
/*
* shaper
*/
hb_bool_t
_hb_old_shape (hb_shape_plan_t *shape_plan HB_UNUSED,
hb_font_t *font,
hb_buffer_t *buffer,
const hb_feature_t *features,
unsigned int num_features)
{
hb_face_t *face = font->face;
HB_Face old_face = HB_SHAPER_DATA_GET (face);
HB_Font old_font = HB_SHAPER_DATA_GET (font);
bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction);
retry:
unsigned int scratch_size;
char *scratch = (char *) buffer->get_scratch_buffer (&scratch_size);
#define utf16_index() var1.u32
HB_UChar16 *pchars = (HB_UChar16 *) scratch;
unsigned int chars_len = 0;
for (unsigned int i = 0; i < buffer->len; i++) {
hb_codepoint_t c = buffer->info[i].codepoint;
buffer->info[i].utf16_index() = chars_len;
if (likely (c < 0x10000))
pchars[chars_len++] = c;
else if (unlikely (c >= 0x110000))
pchars[chars_len++] = 0xFFFD;
else {
pchars[chars_len++] = 0xD800 + ((c - 0x10000) >> 10);
pchars[chars_len++] = 0xDC00 + ((c - 0x10000) & ((1 << 10) - 1));
}
}
#define ALLOCATE_ARRAY(Type, name, len) \
name = (Type *) scratch; \
scratch += (len) * sizeof ((name)[0]); \
scratch_size -= (len) * sizeof ((name)[0]);
HB_ShaperItem item = {0};
ALLOCATE_ARRAY (const HB_UChar16, item.string, chars_len);
ALLOCATE_ARRAY (unsigned short, item.log_clusters, chars_len + 2);
item.stringLength = chars_len;
item.item.pos = 0;
item.item.length = item.stringLength;
item.item.script = hb_old_script_from_script (buffer->props.script);
item.item.bidiLevel = backward ? 1 : 0;
item.font = old_font;
item.face = old_face;
item.shaperFlags = 0;
item.glyphIndicesPresent = false;
/* TODO Alignment. */
unsigned int num_glyphs = scratch_size / (sizeof (HB_Glyph) +
sizeof (HB_GlyphAttributes) +
sizeof (HB_Fixed) +
sizeof (HB_FixedPoint) +
sizeof (uint32_t));
item.num_glyphs = num_glyphs;
ALLOCATE_ARRAY (HB_Glyph, item.glyphs, num_glyphs);
ALLOCATE_ARRAY (HB_GlyphAttributes, item.attributes, num_glyphs);
ALLOCATE_ARRAY (HB_Fixed, item.advances, num_glyphs);
ALLOCATE_ARRAY (HB_FixedPoint, item.offsets, num_glyphs);
/* Apparently in some cases the offsets array will not be fully assigned to.
* Clear it. */
memset (item.offsets, 0, num_glyphs * sizeof (item.offsets[0]));
uint32_t *vis_clusters;
ALLOCATE_ARRAY (uint32_t, vis_clusters, num_glyphs);
#undef ALLOCATE_ARRAY
if (!HB_ShapeItem (&item))
{
if (unlikely (item.num_glyphs > num_glyphs))
{
buffer->ensure (buffer->allocated * 2);
if (buffer->in_error)
return false;
goto retry;
}
return false;
}
num_glyphs = item.num_glyphs;
/* Ok, we've got everything we need, now compose output buffer,
* very, *very*, carefully! */
/* Calculate visual-clusters. That's what we ship. */
for (unsigned int i = 0; i < num_glyphs; i++)
vis_clusters[i] = -1;
for (unsigned int i = 0; i < buffer->len; i++) {
uint32_t *p = &vis_clusters[item.log_clusters[buffer->info[i].utf16_index()]];
*p = MIN (*p, buffer->info[i].cluster);
}
for (unsigned int i = 1; i < num_glyphs; i++)
if (vis_clusters[i] == (uint32_t) -1)
vis_clusters[i] = vis_clusters[i - 1];
#undef utf16_index
buffer->ensure (num_glyphs);
if (buffer->in_error)
return false;
buffer->len = num_glyphs;
hb_glyph_info_t *info = buffer->info;
for (unsigned int i = 0; i < num_glyphs; i++)
{
info[i].codepoint = item.glyphs[i];
info[i].cluster = vis_clusters[i];
info[i].mask = item.advances[i];
info[i].var1.u32 = item.offsets[i].x;
info[i].var2.u32 = item.offsets[i].y;
}
buffer->clear_positions ();
for (unsigned int i = 0; i < num_glyphs; ++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;
}
if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
buffer->reverse ();
return true;
}
