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[coretext] Implement vertical shaping 

Currently doesn't work though, we detect font fallback.  Apparently
matching on ct_font is not safe for this.  Looks like commit
25f4fb9b56 wasn't enough after all.
This commit is contained in:
Behdad Esfahbod 2014-08-11 23:47:16 -04:00
parent 1b55077f03
commit 5a0eed3b50
1 changed files with 81 additions and 46 deletions
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99
src/hb-coretext.cc
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@ -684,6 +684,10 @@ retry:
if (unlikely (!attr_string))
FAIL ("CFAttributedStringCreateMutable failed");
CFAttributedStringReplaceString (attr_string, CFRangeMake (0, 0), string_ref);
CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
kCTVerticalFormsAttributeName,
HB_DIRECTION_IS_VERTICAL (buffer->props.direction) ?
kCFBooleanTrue : kCFBooleanFalse);
CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
kCTFontAttributeName, font_data->ct_font);
@ -739,6 +743,7 @@ retry:
CFArrayRef glyph_runs = CTLineGetGlyphRuns (line);
unsigned int num_runs = CFArrayGetCount (glyph_runs);
DEBUG_MSG (CORETEXT, NULL, "Num runs: %d", num_runs);
buffer->len = 0;
uint32_t status_and = ~0, status_or = 0;
@ -778,6 +783,8 @@ retry:
if (!matched)
{
CFRange range = CTRunGetStringRange (run);
DEBUG_MSG (CORETEXT, run, "Run used fallback font: %ld..%ld",
range.location, range.location + range.length);
if (!buffer->ensure_inplace (buffer->len + range.length))
goto resize_and_retry;
hb_glyph_info_t *info = buffer->info + buffer->len;
@ -818,54 +825,73 @@ retry:
if (!buffer->ensure (buffer->len + num_glyphs))
goto resize_and_retry;
hb_glyph_info_t *run_info = buffer->info + buffer->len;
/* Testing used to indicate that CTRunGetGlyphsPtr, etc (almost?) always
* succeed, and so copying data to our own buffer will be rare. Reports
* have it that this changed in OS X 10.10 Yosemite, and NULL is returned
* frequently. At any rate, we can test that codepath by setting USE_PTR
* to false. */
#define USE_PTR true
{
const CGGlyph* glyphs = USE_PTR ? CTRunGetGlyphsPtr (run) : NULL;
if (!glyphs) {
ALLOCATE_ARRAY (CGGlyph, glyph_buf, num_glyphs, goto resize_and_retry);
CTRunGetGlyphs (run, range_all, glyph_buf);
glyphs = glyph_buf;
}
const CGPoint* positions = USE_PTR ? CTRunGetPositionsPtr (run) : NULL;
if (!positions) {
ALLOCATE_ARRAY (CGPoint, position_buf, num_glyphs, goto resize_and_retry);
CTRunGetPositions (run, range_all, position_buf);
positions = position_buf;
}
const CFIndex* string_indices = USE_PTR ? CTRunGetStringIndicesPtr (run) : NULL;
if (!string_indices) {
ALLOCATE_ARRAY (CFIndex, index_buf, num_glyphs, goto resize_and_retry);
CTRunGetStringIndices (run, range_all, index_buf);
string_indices = index_buf;
}
hb_glyph_info_t *info = run_info;
for (unsigned int j = 0; j < num_glyphs; j++)
{
info->codepoint = glyphs[j];
info->cluster = log_clusters[string_indices[j]];
info++;
}
}
{
const CGPoint* positions = USE_PTR ? CTRunGetPositionsPtr (run) : NULL;
if (!positions) {
ALLOCATE_ARRAY (CGPoint, position_buf, num_glyphs, goto resize_and_retry);
CTRunGetPositions (run, range_all, position_buf);
positions = position_buf;
}
double run_advance = CTRunGetTypographicBounds (run, range_all, NULL, NULL, NULL);
DEBUG_MSG (CORETEXT, run, "Run advance: %g", run_advance);
hb_glyph_info_t *info = run_info;
if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction))
{
for (unsigned int j = 0; j < num_glyphs; j++)
{
double advance = (j + 1 < num_glyphs ? positions[j + 1].x : positions[0].x + run_advance) - positions[j].x;
info->mask = advance;
info->var1.u32 = positions[0].x; /* Yes, zero. */
info->var2.u32 = positions[j].y;
info++;
}
}
else
{
run_advance = -run_advance;
for (unsigned int j = 0; j < num_glyphs; j++)
{
double advance = (j + 1 < num_glyphs ? positions[j + 1].y : positions[0].y + run_advance) - positions[j].y;
info->mask = advance;
info->var1.u32 = positions[j].x;
info->var2.u32 = positions[0].y; /* Yes, zero. */
info++;
}
}
}
#undef USE_PTR
#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];
info->codepoint = glyphs[j];
info->cluster = log_clusters[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->len += num_glyphs;
}
/* Make sure all runs had the expected direction. */
@ -876,14 +902,23 @@ retry:
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 */
hb_glyph_info_t *info = buffer->info;
hb_glyph_position_t *pos = buffer->pos;
if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction))
for (unsigned int i = 0; i < count; i++)
{
pos->x_advance = info->mask;
pos->x_offset = info->var1.u32;
pos->y_offset = info->var2.u32;
info++, pos++;
}
else
for (unsigned int i = 0; i < count; i++)
{
pos->y_advance = info->mask;
pos->x_offset = info->var1.u32;
pos->y_offset = info->var2.u32;
info++, pos++;
}
/* Fix up clusters so that we never return out-of-order indices;