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[glyf] Reapply common moving logic to GlyphHeader struct

This commit is contained in:
Ebrahim Byagowi 2019-08-29 20:17:31 +04:30
parent 852c9aa0e3
commit 9e80fc6836
1 changed files with 17 additions and 10 deletions
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27
src/hb-ot-glyf-table.hh
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@ -247,7 +247,7 @@ struct glyf
static bool _remove_composite_instruction_flag (hb_bytes_t glyph)
{
const GlyphHeader &glyph_header = StructAtOffset<GlyphHeader> (&glyph, 0);
if (glyph_header.numberOfContours >= 0) return true; // only for composites
if (!glyph_header.is_composite_glyph ()) return true; // only for composites
/* remove WE_HAVE_INSTRUCTIONS from flags in dest */
OT::glyf::CompositeGlyphHeader::Iterator composite_it;
@ -284,6 +284,15 @@ struct glyf
struct GlyphHeader
{
unsigned int simple_instruction_len_offset () const
{ return static_size + 2 * numberOfContours; }
unsigned int simple_length (unsigned int instruction_len) const
{ return simple_instruction_len_offset () + 2 + instruction_len; }
bool is_composite_glyph () const { return numberOfContours < 0; }
bool is_simple_glyph () const { return numberOfContours > 0; }
HBINT16 numberOfContours; /* If the number of contours is
* greater than or equal to zero,
* this is a simple glyph; if negative,
@ -456,7 +465,7 @@ struct glyf
return false; /* Empty glyph; zero extents. */
const GlyphHeader &glyph_header = StructAtOffset<GlyphHeader> (glyph_data, 0);
if (glyph_header.numberOfContours < 0)
if (glyph_header.is_composite_glyph ())
{
const CompositeGlyphHeader *possible =
&StructAfter<CompositeGlyphHeader, GlyphHeader> (glyph_header);
@ -867,7 +876,7 @@ struct glyf
else if (num_contours > 0)
{
/* simple glyph w/contours, possibly trimmable */
glyph += GlyphHeader::static_size + 2 * num_contours;
glyph += glyph_header.simple_instruction_len_offset ();
if (unlikely (glyph + 2 >= glyph_end)) return false;
uint16_t nCoordinates = (uint16_t) StructAtOffset<HBUINT16> (glyph - 2, 0) + 1;
@ -998,7 +1007,8 @@ struct glyf
}
const HBUINT16 &instruction_len = StructAtOffset<HBUINT16> (&glyph, instruction_length_offset);
if (unlikely (instruction_length_offset + 2 + instruction_len > glyph.length)) // Out of bounds of the current glyph
/* Out of bounds of the current glyph */
if (unlikely (glyph_header.simple_length (instruction_len) > glyph.length))
{
DEBUG_MSG(SUBSET, nullptr, "The instructions array overruns the glyph's boundaries.");
return false;
@ -1151,19 +1161,16 @@ struct glyf
}
const GlyphHeader& header = StructAtOffset<GlyphHeader> (&source_glyph, 0);
int16_t num_contours = (int16_t) header.numberOfContours;
DEBUG_MSG (SUBSET, nullptr, "Unable to read instruction length for new_gid %d",
new_gid);
if (num_contours < 0)
if (header.is_composite_glyph ())
{
// composite, just chop instructions off the end
/* just chop instructions off the end for composite glyphs */
dest_start = hb_bytes_t (&source_glyph, source_glyph.length - instruction_len);
}
else
{
// simple glyph
unsigned int glyph_length = GlyphHeader::static_size + 2 * header.numberOfContours
+ 2 + instruction_len;
unsigned int glyph_length = header.simple_length (instruction_len);
dest_start = hb_bytes_t (&source_glyph, glyph_length - instruction_len);
dest_end = hb_bytes_t (&source_glyph + glyph_length,
source_glyph.length - glyph_length);