harfbuzz/src/hb-coretext.cc

356 lines
11 KiB
C++

/*
* Copyright © 2012 Mozilla Foundation.
* 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.
*
* Mozilla Author(s): Jonathan Kew
* Google Author(s): Behdad Esfahbod
*/
#define HB_SHAPER coretext
#include "hb-shaper-impl-private.hh"
#include "hb-coretext.h"
#ifndef HB_DEBUG_CORETEXT
#define HB_DEBUG_CORETEXT (HB_DEBUG+0)
#endif
HB_SHAPER_DATA_ENSURE_DECLARE(coretext, face)
HB_SHAPER_DATA_ENSURE_DECLARE(coretext, font)
/*
* shaper face data
*/
struct hb_coretext_shaper_face_data_t {
CGFontRef cg_font;
};
static void
release_data (void *info, const void *data, size_t size)
{
assert (hb_blob_get_length ((hb_blob_t *) info) == size &&
hb_blob_get_data ((hb_blob_t *) info, NULL) == data);
hb_blob_destroy ((hb_blob_t *) info);
}
hb_coretext_shaper_face_data_t *
_hb_coretext_shaper_face_data_create (hb_face_t *face)
{
hb_coretext_shaper_face_data_t *data = (hb_coretext_shaper_face_data_t *) calloc (1, sizeof (hb_coretext_shaper_face_data_t));
if (unlikely (!data))
return NULL;
hb_blob_t *blob = hb_face_reference_blob (face);
unsigned int blob_length;
const char *blob_data = hb_blob_get_data (blob, &blob_length);
if (unlikely (!blob_length))
DEBUG_MSG (CORETEXT, face, "Face has empty blob");
CGDataProviderRef provider = CGDataProviderCreateWithData (blob, blob_data, blob_length, &release_data);
data->cg_font = CGFontCreateWithDataProvider (provider);
CGDataProviderRelease (provider);
if (unlikely (!data->cg_font)) {
DEBUG_MSG (CORETEXT, face, "Face CGFontCreateWithDataProvider() failed");
free (data);
return NULL;
}
return data;
}
void
_hb_coretext_shaper_face_data_destroy (hb_coretext_shaper_face_data_t *data)
{
CFRelease (data->cg_font);
free (data);
}
CGFontRef
hb_coretext_face_get_cg_font (hb_face_t *face)
{
if (unlikely (!hb_coretext_shaper_face_data_ensure (face))) return NULL;
hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
return face_data->cg_font;
}
/*
* shaper font data
*/
struct hb_coretext_shaper_font_data_t {
CTFontRef ct_font;
};
hb_coretext_shaper_font_data_t *
_hb_coretext_shaper_font_data_create (hb_font_t *font)
{
if (unlikely (!hb_coretext_shaper_face_data_ensure (font->face))) return NULL;
hb_coretext_shaper_font_data_t *data = (hb_coretext_shaper_font_data_t *) calloc (1, sizeof (hb_coretext_shaper_font_data_t));
if (unlikely (!data))
return NULL;
hb_face_t *face = font->face;
hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
data->ct_font = CTFontCreateWithGraphicsFont (face_data->cg_font, font->y_scale, NULL, NULL);
if (unlikely (!data->ct_font)) {
DEBUG_MSG (CORETEXT, font, "Font CTFontCreateWithGraphicsFont() failed");
free (data);
return NULL;
}
return data;
}
void
_hb_coretext_shaper_font_data_destroy (hb_coretext_shaper_font_data_t *data)
{
CFRelease (data->ct_font);
free (data);
}
/*
* shaper shape_plan data
*/
struct hb_coretext_shaper_shape_plan_data_t {};
hb_coretext_shaper_shape_plan_data_t *
_hb_coretext_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_coretext_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
}
void
_hb_coretext_shaper_shape_plan_data_destroy (hb_coretext_shaper_shape_plan_data_t *data HB_UNUSED)
{
}
CTFontRef
hb_coretext_font_get_ct_font (hb_font_t *font)
{
if (unlikely (!hb_coretext_shaper_font_data_ensure (font))) return NULL;
hb_coretext_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);
return font_data->ct_font;
}
/*
* shaper
*/
hb_bool_t
_hb_coretext_shape (hb_shape_plan_t *shape_plan,
hb_font_t *font,
hb_buffer_t *buffer,
const hb_feature_t *features,
unsigned int num_features)
{
hb_face_t *face = font->face;
hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
hb_coretext_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);
#define FAIL(...) \
HB_STMT_START { \
DEBUG_MSG (CORETEXT, NULL, __VA_ARGS__); \
return false; \
} HB_STMT_END;
unsigned int scratch_size;
char *scratch = (char *) buffer->get_scratch_buffer (&scratch_size);
#define utf16_index() var1.u32
UniChar *pchars = (UniChar *) 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));
}
}
#undef utf16_index
CFStringRef string_ref = CFStringCreateWithCharactersNoCopy (kCFAllocatorDefault,
pchars, chars_len,
kCFAllocatorNull);
CFDictionaryRef attrs = CFDictionaryCreate (kCFAllocatorDefault,
(const void**) &kCTFontAttributeName,
(const void**) &font_data->ct_font,
1, /* count of attributes */
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
/* TODO: support features */
CFAttributedStringRef attr_string = CFAttributedStringCreate (kCFAllocatorDefault, string_ref, attrs);
CFRelease (string_ref);
CFRelease (attrs);
CTLineRef line = CTLineCreateWithAttributedString (attr_string);
CFRelease (attr_string);
CFArrayRef glyph_runs = CTLineGetGlyphRuns (line);
unsigned int num_runs = CFArrayGetCount (glyph_runs);
bool success = true;
buffer->len = 0;
const CFRange range_all = CFRangeMake (0, 0);
for (unsigned int i = 0; i < num_runs; i++) {
CTRunRef run = (CTRunRef) CFArrayGetValueAtIndex (glyph_runs, i);
unsigned int num_glyphs = CTRunGetGlyphCount (run);
if (num_glyphs == 0)
continue;
buffer->ensure (buffer->len + num_glyphs);
/* Testing indicates that CTRunGetGlyphsPtr (almost?) always succeeds,
* and so copying data to our own buffer with CTRunGetGlyphs will be
* extremely rare. */
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]);
const CGGlyph* glyphs = CTRunGetGlyphsPtr (run);
if (!glyphs) {
ALLOCATE_ARRAY (CGGlyph, glyph_buf, num_glyphs);
CTRunGetGlyphs (run, range_all, glyph_buf);
glyphs = glyph_buf;
}
const CGPoint* positions = CTRunGetPositionsPtr (run);
if (!positions) {
ALLOCATE_ARRAY (CGPoint, position_buf, num_glyphs);
CTRunGetPositions (run, range_all, position_buf);
positions = position_buf;
}
const CFIndex* string_indices = CTRunGetStringIndicesPtr (run);
if (!string_indices) {
ALLOCATE_ARRAY (CFIndex, index_buf, num_glyphs);
CTRunGetStringIndices (run, range_all, index_buf);
string_indices = index_buf;
}
#undef ALLOCATE_ARRAY
double run_width = CTRunGetTypographicBounds (run, range_all, NULL, NULL, NULL);
for (unsigned int j = 0; j < num_glyphs; j++) {
double advance = (j + 1 < num_glyphs ? positions[j + 1].x : positions[0].x + run_width) - positions[j].x;
hb_glyph_info_t *info = &buffer->info[buffer->len];
hb_glyph_position_t *pos = &buffer->pos[buffer->len];
info->codepoint = glyphs[j];
info->cluster = string_indices[j];
/* Currently, we do all x-positioning by setting the advance, we never use x-offset. */
info->mask = advance;
info->var1.u32 = 0;
info->var2.u32 = positions[j].y;
buffer->len++;
}
}
buffer->clear_positions ();
unsigned int count = buffer->len;
for (unsigned int i = 0; i < count; ++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;
}
/* Fix up clusters so that we never return out-of-order indices;
* if core text has reordered glyphs, we'll merge them to the
* beginning of the reordered cluster.
*
* This does *not* mean we'll form the same clusters as Uniscribe
* or the native OT backend, only that the cluster indices will be
* monotonic in the output buffer. */
if (HB_DIRECTION_IS_FORWARD (buffer->props.direction)) {
unsigned int prev_cluster = 0;
for (unsigned int i = 0; i < count; i++) {
unsigned int curr_cluster = buffer->info[i].cluster;
if (curr_cluster < prev_cluster) {
for (unsigned int j = i; j > 0; j--) {
if (buffer->info[j - 1].cluster > curr_cluster)
buffer->info[j - 1].cluster = curr_cluster;
else
break;
}
}
prev_cluster = curr_cluster;
}
} else {
unsigned int prev_cluster = (unsigned int)-1;
for (unsigned int i = 0; i < count; i++) {
unsigned int curr_cluster = buffer->info[i].cluster;
if (curr_cluster > prev_cluster) {
for (unsigned int j = i; j > 0; j--) {
if (buffer->info[j - 1].cluster < curr_cluster)
buffer->info[j - 1].cluster = curr_cluster;
else
break;
}
}
prev_cluster = curr_cluster;
}
}
return true;
}