#define HB_OT_GLYF_TABLE_HH
#include "hb-open-type-private.hh"
-
+#include "hb-ot-head-table.hh"
+#include "hb-subset-glyf.hh"
+#include "hb-subset-plan.hh"
+#include "hb-subset-private.hh"
namespace OT {
struct loca
{
+ friend struct glyf;
+
static const hb_tag_t tableTag = HB_OT_TAG_loca;
inline bool sanitize (hb_sanitize_context_t *c) const
return_trace (true);
}
- public:
- union {
- USHORT shortsZ[VAR]; /* Location offset divided by 2. */
- ULONG longsZ[VAR]; /* Location offset. */
- } u;
- DEFINE_SIZE_ARRAY (0, u.longsZ);
+ protected:
+ HBUINT8 dataX[VAR]; /* Location data. */
+ DEFINE_SIZE_ARRAY (0, dataX);
};
return_trace (true);
}
- public:
- BYTE dataX[VAR]; /* Glyphs data. */
+ inline bool subset (hb_subset_plan_t *plan) const
+ {
+ hb_blob_t *glyf_prime = nullptr;
+ hb_blob_t *loca_prime = nullptr;
- DEFINE_SIZE_ARRAY (0, dataX);
-};
+ bool success = true;
+ bool use_short_loca = false;
+ if (hb_subset_glyf_and_loca (plan, &use_short_loca, &glyf_prime, &loca_prime)) {
+ success = success && hb_subset_plan_add_table (plan, HB_OT_TAG_glyf, glyf_prime);
+ success = success && hb_subset_plan_add_table (plan, HB_OT_TAG_loca, loca_prime);
+ success = success && _add_head_and_set_loca_version (plan->source, use_short_loca, plan->dest);
+ } else {
+ success = false;
+ }
+ hb_blob_destroy (loca_prime);
+ hb_blob_destroy (glyf_prime);
-struct glyfGlyphHeader
-{
- SHORT numberOfContours; /* If the number of contours is
- * greater than or equal to zero,
- * this is a simple glyph; if negative,
- * this is a composite glyph. */
- FWORD xMin; /* Minimum x for coordinate data. */
- FWORD yMin; /* Minimum y for coordinate data. */
- FWORD xMax; /* Maximum x for coordinate data. */
- FWORD yMax; /* Maximum y for coordinate data. */
-
- DEFINE_SIZE_STATIC (10);
+ return success;
+ }
+
+ static bool
+ _add_head_and_set_loca_version (hb_face_t *source, bool use_short_loca, hb_face_t *dest)
+ {
+ hb_blob_t *head_blob = OT::Sanitizer<OT::head>().sanitize (hb_face_reference_table (source, HB_OT_TAG_head));
+ hb_blob_t *head_prime_blob = hb_blob_copy_writable_or_fail (head_blob);
+ hb_blob_destroy (head_blob);
+
+ if (unlikely (!head_prime_blob))
+ return false;
+
+ OT::head *head_prime = (OT::head *) hb_blob_get_data_writable (head_prime_blob, nullptr);
+ head_prime->indexToLocFormat.set (use_short_loca ? 0 : 1);
+ bool success = hb_subset_face_add_table (dest, HB_OT_TAG_head, head_prime_blob);
+
+ hb_blob_destroy (head_prime_blob);
+ return success;
+ }
+
+ struct GlyphHeader
+ {
+ HBINT16 numberOfContours; /* If the number of contours is
+ * greater than or equal to zero,
+ * this is a simple glyph; if negative,
+ * this is a composite glyph. */
+ FWORD xMin; /* Minimum x for coordinate data. */
+ FWORD yMin; /* Minimum y for coordinate data. */
+ FWORD xMax; /* Maximum x for coordinate data. */
+ FWORD yMax; /* Maximum y for coordinate data. */
+
+ DEFINE_SIZE_STATIC (10);
+ };
+
+ struct CompositeGlyphHeader
+ {
+ static const uint16_t ARG_1_AND_2_ARE_WORDS = 0x0001;
+ static const uint16_t ARGS_ARE_XY_VALUES = 0x0002;
+ static const uint16_t ROUND_XY_TO_GRID = 0x0004;
+ static const uint16_t WE_HAVE_A_SCALE = 0x0008;
+ static const uint16_t MORE_COMPONENTS = 0x0020;
+ static const uint16_t WE_HAVE_AN_X_AND_Y_SCALE = 0x0040;
+ static const uint16_t WE_HAVE_A_TWO_BY_TWO = 0x0080;
+ static const uint16_t WE_HAVE_INSTRUCTIONS = 0x0100;
+ static const uint16_t USE_MY_METRICS = 0x0200;
+ static const uint16_t OVERLAP_COMPOUND = 0x0400;
+ static const uint16_t SCALED_COMPONENT_OFFSET = 0x0800;
+ static const uint16_t UNSCALED_COMPONENT_OFFSET = 0x1000;
+
+ HBUINT16 flags;
+ HBUINT16 glyphIndex;
+
+ inline unsigned int get_size (void) const
+ {
+ unsigned int size = min_size;
+ if (flags & ARG_1_AND_2_ARE_WORDS) {
+ // arg1 and 2 are int16
+ size += 4;
+ } else {
+ // arg1 and 2 are int8
+ size += 2;
+ }
+ if (flags & WE_HAVE_A_SCALE) {
+ // One x 16 bit (scale)
+ size += 2;
+ } else if (flags & WE_HAVE_AN_X_AND_Y_SCALE) {
+ // Two x 16 bit (xscale, yscale)
+ size += 4;
+ } else if (flags & WE_HAVE_A_TWO_BY_TWO) {
+ // Four x 16 bit (xscale, scale01, scale10, yscale)
+ size += 8;
+ }
+ return size;
+ }
+
+ struct Iterator
+ {
+ const char *glyph_start;
+ const char *glyph_end;
+ const CompositeGlyphHeader *current;
+
+ inline bool move_to_next ()
+ {
+ if (current->flags & CompositeGlyphHeader::MORE_COMPONENTS)
+ {
+ const CompositeGlyphHeader *possible =
+ &StructAfter<CompositeGlyphHeader, CompositeGlyphHeader> (*current);
+ if (!in_range (possible))
+ return false;
+ current = possible;
+ return true;
+ }
+ return false;
+ }
+
+ inline bool in_range (const CompositeGlyphHeader *composite) const
+ {
+ return (const char *) composite >= glyph_start
+ && ((const char *) composite + CompositeGlyphHeader::min_size) <= glyph_end
+ && ((const char *) composite + composite->get_size()) <= glyph_end;
+ }
+ };
+
+ static inline bool get_iterator (const char * glyph_data,
+ unsigned int length,
+ CompositeGlyphHeader::Iterator *iterator /* OUT */)
+ {
+ if (length < GlyphHeader::static_size)
+ return false; /* Empty glyph; zero extents. */
+
+ const GlyphHeader &glyph_header = StructAtOffset<GlyphHeader> (glyph_data, 0);
+ if (glyph_header.numberOfContours < 0)
+ {
+ const CompositeGlyphHeader *possible =
+ &StructAfter<CompositeGlyphHeader, GlyphHeader> (glyph_header);
+
+ iterator->glyph_start = glyph_data;
+ iterator->glyph_end = (const char *) glyph_data + length;
+ if (!iterator->in_range (possible))
+ return false;
+ iterator->current = possible;
+ return true;
+ }
+
+ return false;
+ }
+
+ DEFINE_SIZE_MIN (4);
+ };
+
+ struct accelerator_t
+ {
+ inline void init (hb_face_t *face)
+ {
+ hb_blob_t *head_blob = Sanitizer<head>().sanitize (face->reference_table (HB_OT_TAG_head));
+ const head *head_table = Sanitizer<head>::lock_instance (head_blob);
+ if ((unsigned int) head_table->indexToLocFormat > 1 || head_table->glyphDataFormat != 0)
+ {
+ /* Unknown format. Leave num_glyphs=0, that takes care of disabling us. */
+ hb_blob_destroy (head_blob);
+ return;
+ }
+ short_offset = 0 == head_table->indexToLocFormat;
+ hb_blob_destroy (head_blob);
+
+ loca_blob = Sanitizer<loca>().sanitize (face->reference_table (HB_OT_TAG_loca));
+ loca_table = Sanitizer<loca>::lock_instance (loca_blob);
+ glyf_blob = Sanitizer<glyf>().sanitize (face->reference_table (HB_OT_TAG_glyf));
+ glyf_table = Sanitizer<glyf>::lock_instance (glyf_blob);
+
+ num_glyphs = MAX (1u, hb_blob_get_length (loca_blob) / (short_offset ? 2 : 4)) - 1;
+ glyf_len = hb_blob_get_length (glyf_blob);
+ }
+
+ inline void fini (void)
+ {
+ hb_blob_destroy (loca_blob);
+ hb_blob_destroy (glyf_blob);
+ }
+
+ /*
+ * Returns true if the referenced glyph is a valid glyph and a composite glyph.
+ * If true is returned a pointer to the composite glyph will be written into
+ * composite.
+ */
+ inline bool get_composite (hb_codepoint_t glyph,
+ CompositeGlyphHeader::Iterator *composite /* OUT */) const
+ {
+ unsigned int start_offset, end_offset;
+ if (!get_offsets (glyph, &start_offset, &end_offset))
+ return false; /* glyph not found */
+
+ return CompositeGlyphHeader::get_iterator ((const char*) this->glyf_table + start_offset,
+ end_offset - start_offset,
+ composite);
+ }
+
+ /* based on FontTools _g_l_y_f.py::trim */
+ inline bool remove_padding(unsigned int start_offset,
+ unsigned int *end_offset) const
+ {
+ static const int FLAG_X_SHORT = 0x02;
+ static const int FLAG_Y_SHORT = 0x04;
+ static const int FLAG_REPEAT = 0x08;
+ static const int FLAG_X_SAME = 0x10;
+ static const int FLAG_Y_SAME = 0x20;
+
+ if (*end_offset - start_offset < GlyphHeader::static_size)
+ return true;
+
+ const char *glyph = ((const char *) glyf_table) + start_offset;
+ const char * const glyph_end = glyph + (*end_offset - start_offset);
+ const GlyphHeader &glyph_header = StructAtOffset<GlyphHeader> (glyph, 0);
+ int16_t num_contours = (int16_t) glyph_header.numberOfContours;
+
+ if (num_contours < 0)
+ /* Trimming for composites not implemented.
+ * If removing hints it falls out of that. */
+ return true;
+ else if (num_contours > 0)
+ {
+ /* simple glyph w/contours, possibly trimmable */
+ glyph += GlyphHeader::static_size + 2 * num_contours;
+
+ if (unlikely (glyph + 2 >= glyph_end)) return false;
+ uint16_t nCoordinates = (uint16_t) StructAtOffset<HBUINT16>(glyph - 2, 0) + 1;
+ uint16_t nInstructions = (uint16_t) StructAtOffset<HBUINT16>(glyph, 0);
+
+ glyph += 2 + nInstructions;
+ if (unlikely (glyph + 2 >= glyph_end)) return false;
+
+ unsigned int coordBytes = 0;
+ unsigned int coordsWithFlags = 0;
+ while (glyph < glyph_end)
+ {
+ uint8_t flag = (uint8_t) *glyph;
+ glyph++;
+
+ unsigned int repeat = 1;
+ if (flag & FLAG_REPEAT)
+ {
+ if (glyph >= glyph_end)
+ {
+ DEBUG_MSG(SUBSET, nullptr, "Bad flag");
+ return false;
+ }
+ repeat = ((uint8_t) *glyph) + 1;
+ glyph++;
+ }
+
+ unsigned int xBytes, yBytes;
+ xBytes = yBytes = 0;
+ if (flag & FLAG_X_SHORT)
+ xBytes = 1;
+ else if ((flag & FLAG_X_SAME) == 0)
+ xBytes = 2;
+
+ if (flag & FLAG_Y_SHORT)
+ yBytes = 1;
+ else if ((flag & FLAG_Y_SAME) == 0)
+ yBytes = 2;
+
+ coordBytes += (xBytes + yBytes) * repeat;
+ coordsWithFlags += repeat;
+ if (coordsWithFlags >= nCoordinates)
+ break;
+ }
+
+ if (coordsWithFlags != nCoordinates)
+ {
+ DEBUG_MSG(SUBSET, nullptr, "Expect %d coords to have flags, got flags for %d", nCoordinates, coordsWithFlags);
+ return false;
+ }
+ glyph += coordBytes;
+
+ if (glyph < glyph_end)
+ *end_offset -= glyph_end - glyph;
+ }
+ return true;
+ }
+
+ inline bool get_offsets (hb_codepoint_t glyph,
+ unsigned int *start_offset /* OUT */,
+ unsigned int *end_offset /* OUT */) const
+ {
+ if (unlikely (glyph >= num_glyphs))
+ return false;
+
+ if (short_offset)
+ {
+ const HBUINT16 *offsets = (const HBUINT16 *) loca_table->dataX;
+ *start_offset = 2 * offsets[glyph];
+ *end_offset = 2 * offsets[glyph + 1];
+ }
+ else
+ {
+ const HBUINT32 *offsets = (const HBUINT32 *) loca_table->dataX;
+
+ *start_offset = offsets[glyph];
+ *end_offset = offsets[glyph + 1];
+ }
+
+ if (*start_offset > *end_offset || *end_offset > glyf_len)
+ return false;
+
+ return true;
+ }
+
+ inline bool get_instruction_offsets(unsigned int start_offset,
+ unsigned int end_offset,
+ unsigned int *instruction_start /* OUT */,
+ unsigned int *instruction_end /* OUT */) const
+ {
+ if (end_offset - start_offset < GlyphHeader::static_size)
+ {
+ *instruction_start = 0;
+ *instruction_end = 0;
+ return true; /* Empty glyph; no instructions. */
+ }
+ const GlyphHeader &glyph_header = StructAtOffset<GlyphHeader> (glyf_table, start_offset);
+ int16_t num_contours = (int16_t) glyph_header.numberOfContours;
+ if (num_contours < 0)
+ {
+ CompositeGlyphHeader::Iterator composite_it;
+ if (unlikely (!CompositeGlyphHeader::get_iterator (
+ (const char*) this->glyf_table + start_offset,
+ end_offset - start_offset, &composite_it))) return false;
+ const CompositeGlyphHeader *last;
+ do {
+ last = composite_it.current;
+ } while (composite_it.move_to_next());
+
+ if ( (uint16_t) last->flags & CompositeGlyphHeader::WE_HAVE_INSTRUCTIONS)
+ *instruction_start = ((char *) last - (char *) glyf_table->dataX) + last->get_size();
+ else
+ *instruction_start = end_offset;
+ *instruction_end = end_offset;
+ if (unlikely (*instruction_start > *instruction_end))
+ {
+ DEBUG_MSG(SUBSET, nullptr, "Invalid instruction offset, %d is outside [%d, %d]", *instruction_start, start_offset, end_offset);
+ return false;
+ }
+ }
+ else
+ {
+ unsigned int instruction_length_offset = start_offset + GlyphHeader::static_size + 2 * num_contours;
+ const HBUINT16 &instruction_length = StructAtOffset<HBUINT16> (glyf_table, instruction_length_offset);
+ *instruction_start = instruction_length_offset + 2;
+ *instruction_end = *instruction_start + (uint16_t) instruction_length;
+ }
+ return true;
+ }
+
+ inline bool get_extents (hb_codepoint_t glyph,
+ hb_glyph_extents_t *extents) const
+ {
+ unsigned int start_offset, end_offset;
+ if (!get_offsets (glyph, &start_offset, &end_offset))
+ return false;
+
+ if (end_offset - start_offset < GlyphHeader::static_size)
+ return true; /* Empty glyph; zero extents. */
+
+ const GlyphHeader &glyph_header = StructAtOffset<GlyphHeader> (glyf_table, start_offset);
+
+ extents->x_bearing = MIN (glyph_header.xMin, glyph_header.xMax);
+ extents->y_bearing = MAX (glyph_header.yMin, glyph_header.yMax);
+ extents->width = MAX (glyph_header.xMin, glyph_header.xMax) - extents->x_bearing;
+ extents->height = MIN (glyph_header.yMin, glyph_header.yMax) - extents->y_bearing;
+
+ return true;
+ }
+
+ private:
+ bool short_offset;
+ unsigned int num_glyphs;
+ const loca *loca_table;
+ const glyf *glyf_table;
+ hb_blob_t *loca_blob;
+ hb_blob_t *glyf_blob;
+ unsigned int glyf_len;
+ };
+
+ protected:
+ HBUINT8 dataX[VAR]; /* Glyphs data. */
+
+ DEFINE_SIZE_ARRAY (0, dataX);
};
} /* namespace OT */
projects / platform / upstream / harfbuzz.git / blobdiff