summaryrefslogtreecommitdiffstats
path: root/gfx/ots/src/gdef.cc
diff options
context:
space:
mode:
Diffstat (limited to 'gfx/ots/src/gdef.cc')
-rw-r--r--gfx/ots/src/gdef.cc269
1 files changed, 130 insertions, 139 deletions
diff --git a/gfx/ots/src/gdef.cc b/gfx/ots/src/gdef.cc
index 71c6fc592..71e1075e3 100644
--- a/gfx/ots/src/gdef.cc
+++ b/gfx/ots/src/gdef.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011-2017 The OTS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
@@ -11,68 +11,60 @@
#include "gsub.h"
#include "layout.h"
#include "maxp.h"
+#include "variations.h"
// GDEF - The Glyph Definition Table
// http://www.microsoft.com/typography/otspec/gdef.htm
-#define TABLE_NAME "GDEF"
-
namespace {
-// The maximum class value in class definition tables.
-const uint16_t kMaxClassDefValue = 0xFFFF;
// The maximum class value in the glyph class definision table.
const uint16_t kMaxGlyphClassDefValue = 4;
// The maximum format number of caret value tables.
-// We don't support format 3 for now. See the comment in
-// ParseLigCaretListTable() for the reason.
-const uint16_t kMaxCaretValueFormat = 2;
-
-bool ParseGlyphClassDefTable(ots::Font *font, const uint8_t *data,
- size_t length, const uint16_t num_glyphs) {
- return ots::ParseClassDefTable(font, data, length, num_glyphs,
- kMaxGlyphClassDefValue);
-}
+const uint16_t kMaxCaretValueFormat = 3;
+
+} // namespace
-bool ParseAttachListTable(ots::Font *font, const uint8_t *data,
- size_t length, const uint16_t num_glyphs) {
+namespace ots {
+
+bool OpenTypeGDEF::ParseAttachListTable(const uint8_t *data, size_t length) {
ots::Buffer subtable(data, length);
uint16_t offset_coverage = 0;
uint16_t glyph_count = 0;
if (!subtable.ReadU16(&offset_coverage) ||
!subtable.ReadU16(&glyph_count)) {
- return OTS_FAILURE_MSG("Failed to read gdef header");
+ return Error("Failed to read gdef header");
}
const unsigned attach_points_end =
2 * static_cast<unsigned>(glyph_count) + 4;
if (attach_points_end > std::numeric_limits<uint16_t>::max()) {
- return OTS_FAILURE_MSG("Bad glyph count in gdef");
+ return Error("Bad glyph count in gdef");
}
if (offset_coverage == 0 || offset_coverage >= length ||
offset_coverage < attach_points_end) {
- return OTS_FAILURE_MSG("Bad coverage offset %d", offset_coverage);
+ return Error("Bad coverage offset %d", offset_coverage);
}
- if (glyph_count > num_glyphs) {
- return OTS_FAILURE_MSG("Bad glyph count %u", glyph_count);
+ if (glyph_count > this->m_num_glyphs) {
+ return Error("Bad glyph count %u", glyph_count);
}
std::vector<uint16_t> attach_points;
attach_points.resize(glyph_count);
for (unsigned i = 0; i < glyph_count; ++i) {
if (!subtable.ReadU16(&attach_points[i])) {
- return OTS_FAILURE_MSG("Can't read attachment point %d", i);
+ return Error("Can't read attachment point %d", i);
}
if (attach_points[i] >= length ||
attach_points[i] < attach_points_end) {
- return OTS_FAILURE_MSG("Bad attachment point %d of %d", i, attach_points[i]);
+ return Error("Bad attachment point %d of %d", i, attach_points[i]);
}
}
// Parse coverage table
- if (!ots::ParseCoverageTable(font, data + offset_coverage,
- length - offset_coverage, num_glyphs)) {
- return OTS_FAILURE_MSG("Bad coverage table");
+ if (!ots::ParseCoverageTable(GetFont(), data + offset_coverage,
+ length - offset_coverage, this->m_num_glyphs)) {
+ return Error("Bad coverage table");
}
// Parse attach point table
@@ -80,20 +72,20 @@ bool ParseAttachListTable(ots::Font *font, const uint8_t *data,
subtable.set_offset(attach_points[i]);
uint16_t point_count = 0;
if (!subtable.ReadU16(&point_count)) {
- return OTS_FAILURE_MSG("Can't read point count %d", i);
+ return Error("Can't read point count %d", i);
}
if (point_count == 0) {
- return OTS_FAILURE_MSG("zero point count %d", i);
+ return Error("zero point count %d", i);
}
uint16_t last_point_index = 0;
uint16_t point_index = 0;
for (unsigned j = 0; j < point_count; ++j) {
if (!subtable.ReadU16(&point_index)) {
- return OTS_FAILURE_MSG("Can't read point index %d in point %d", j, i);
+ return Error("Can't read point index %d in point %d", j, i);
}
// Contour point indeces are in increasing numerical order
if (last_point_index != 0 && last_point_index >= point_index) {
- return OTS_FAILURE_MSG("bad contour indeces: %u >= %u",
+ return Error("bad contour indeces: %u >= %u",
last_point_index, point_index);
}
last_point_index = point_index;
@@ -102,43 +94,42 @@ bool ParseAttachListTable(ots::Font *font, const uint8_t *data,
return true;
}
-bool ParseLigCaretListTable(ots::Font *font, const uint8_t *data,
- size_t length, const uint16_t num_glyphs) {
+bool OpenTypeGDEF::ParseLigCaretListTable(const uint8_t *data, size_t length) {
ots::Buffer subtable(data, length);
uint16_t offset_coverage = 0;
uint16_t lig_glyph_count = 0;
if (!subtable.ReadU16(&offset_coverage) ||
!subtable.ReadU16(&lig_glyph_count)) {
- return OTS_FAILURE_MSG("Can't read caret structure");
+ return Error("Can't read caret structure");
}
const unsigned lig_glyphs_end =
2 * static_cast<unsigned>(lig_glyph_count) + 4;
if (lig_glyphs_end > std::numeric_limits<uint16_t>::max()) {
- return OTS_FAILURE_MSG("Bad caret structure");
+ return Error("Bad caret structure");
}
if (offset_coverage == 0 || offset_coverage >= length ||
offset_coverage < lig_glyphs_end) {
- return OTS_FAILURE_MSG("Bad caret coverate offset %d", offset_coverage);
+ return Error("Bad caret coverate offset %d", offset_coverage);
}
- if (lig_glyph_count > num_glyphs) {
- return OTS_FAILURE_MSG("bad ligature glyph count: %u", lig_glyph_count);
+ if (lig_glyph_count > this->m_num_glyphs) {
+ return Error("bad ligature glyph count: %u", lig_glyph_count);
}
std::vector<uint16_t> lig_glyphs;
lig_glyphs.resize(lig_glyph_count);
for (unsigned i = 0; i < lig_glyph_count; ++i) {
if (!subtable.ReadU16(&lig_glyphs[i])) {
- return OTS_FAILURE_MSG("Can't read ligature glyph location %d", i);
+ return Error("Can't read ligature glyph location %d", i);
}
if (lig_glyphs[i] >= length || lig_glyphs[i] < lig_glyphs_end) {
- return OTS_FAILURE_MSG("Bad ligature glyph location %d in glyph %d", lig_glyphs[i], i);
+ return Error("Bad ligature glyph location %d in glyph %d", lig_glyphs[i], i);
}
}
// Parse coverage table
- if (!ots::ParseCoverageTable(font, data + offset_coverage,
- length - offset_coverage, num_glyphs)) {
- return OTS_FAILURE_MSG("Can't parse caret coverage table");
+ if (!ots::ParseCoverageTable(GetFont(), data + offset_coverage,
+ length - offset_coverage, this->m_num_glyphs)) {
+ return Error("Can't parse caret coverage table");
}
// Parse ligature glyph table
@@ -146,10 +137,10 @@ bool ParseLigCaretListTable(ots::Font *font, const uint8_t *data,
subtable.set_offset(lig_glyphs[i]);
uint16_t caret_count = 0;
if (!subtable.ReadU16(&caret_count)) {
- return OTS_FAILURE_MSG("Can't read caret count for glyph %d", i);
+ return Error("Can't read caret count for glyph %d", i);
}
if (caret_count == 0) {
- return OTS_FAILURE_MSG("bad caret value count: %u", caret_count);
+ return Error("bad caret value count: %u", caret_count);
}
std::vector<uint16_t> caret_value_offsets;
@@ -157,10 +148,10 @@ bool ParseLigCaretListTable(ots::Font *font, const uint8_t *data,
unsigned caret_value_offsets_end = 2 * static_cast<unsigned>(caret_count) + 2;
for (unsigned j = 0; j < caret_count; ++j) {
if (!subtable.ReadU16(&caret_value_offsets[j])) {
- return OTS_FAILURE_MSG("Can't read caret offset %d for glyph %d", j, i);
+ return Error("Can't read caret offset %d for glyph %d", j, i);
}
if (caret_value_offsets[j] >= length || caret_value_offsets[j] < caret_value_offsets_end) {
- return OTS_FAILURE_MSG("Bad caret offset %d for caret %d glyph %d", caret_value_offsets[j], j, i);
+ return Error("Bad caret offset %d for caret %d glyph %d", caret_value_offsets[j], j, i);
}
}
@@ -169,91 +160,93 @@ bool ParseLigCaretListTable(ots::Font *font, const uint8_t *data,
subtable.set_offset(lig_glyphs[i] + caret_value_offsets[j]);
uint16_t caret_format = 0;
if (!subtable.ReadU16(&caret_format)) {
- return OTS_FAILURE_MSG("Can't read caret values table %d in glyph %d", j, i);
+ return Error("Can't read caret values table %d in glyph %d", j, i);
}
- // TODO(bashi): We only support caret value format 1 and 2 for now
- // because there are no fonts which contain caret value format 3
- // as far as we investigated.
if (caret_format == 0 || caret_format > kMaxCaretValueFormat) {
- return OTS_FAILURE_MSG("bad caret value format: %u", caret_format);
+ return Error("bad caret value format: %u", caret_format);
}
// CaretValueFormats contain a 2-byte field which could be
// arbitrary value.
if (!subtable.Skip(2)) {
- return OTS_FAILURE_MSG("Bad caret value table structure %d in glyph %d", j, i);
+ return Error("Bad caret value table structure %d in glyph %d", j, i);
+ }
+ if (caret_format == 3) {
+ uint16_t offset_device = 0;
+ if (!subtable.ReadU16(&offset_device)) {
+ return Error("Can't read device offset for caret value %d "
+ "in glyph %d", j, i);
+ }
+ uint16_t absolute_offset = lig_glyphs[i] + caret_value_offsets[j]
+ + offset_device;
+ if (offset_device == 0 || absolute_offset >= length) {
+ return Error("Bad device offset for caret value %d in glyph %d: %d",
+ j, i, offset_device);
+ }
+ if (!ots::ParseDeviceTable(GetFont(), data + absolute_offset,
+ length - absolute_offset)) {
+ return Error("Bad device table for caret value %d in glyph %d",
+ j, i, offset_device);
+ }
}
}
}
return true;
}
-bool ParseMarkAttachClassDefTable(ots::Font *font, const uint8_t *data,
- size_t length, const uint16_t num_glyphs) {
- return ots::ParseClassDefTable(font, data, length, num_glyphs, kMaxClassDefValue);
-}
-
-bool ParseMarkGlyphSetsDefTable(ots::Font *font, const uint8_t *data,
- size_t length, const uint16_t num_glyphs) {
+bool OpenTypeGDEF::ParseMarkGlyphSetsDefTable(const uint8_t *data, size_t length) {
ots::Buffer subtable(data, length);
uint16_t format = 0;
uint16_t mark_set_count = 0;
if (!subtable.ReadU16(&format) ||
!subtable.ReadU16(&mark_set_count)) {
- return OTS_FAILURE_MSG("Can' read mark glyph table structure");
+ return Error("Can' read mark glyph table structure");
}
if (format != 1) {
- return OTS_FAILURE_MSG("bad mark glyph set table format: %u", format);
+ return Error("bad mark glyph set table format: %u", format);
}
const unsigned mark_sets_end = 2 * static_cast<unsigned>(mark_set_count) + 4;
if (mark_sets_end > std::numeric_limits<uint16_t>::max()) {
- return OTS_FAILURE_MSG("Bad mark_set %d", mark_sets_end);
+ return Error("Bad mark_set %d", mark_sets_end);
}
for (unsigned i = 0; i < mark_set_count; ++i) {
uint32_t offset_coverage = 0;
if (!subtable.ReadU32(&offset_coverage)) {
- return OTS_FAILURE_MSG("Can't read covrage location for mark set %d", i);
+ return Error("Can't read covrage location for mark set %d", i);
}
if (offset_coverage >= length ||
offset_coverage < mark_sets_end) {
- return OTS_FAILURE_MSG("Bad coverage location %d for mark set %d", offset_coverage, i);
+ return Error("Bad coverage location %d for mark set %d", offset_coverage, i);
}
- if (!ots::ParseCoverageTable(font, data + offset_coverage,
- length - offset_coverage, num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse coverage table for mark set %d", i);
+ if (!ots::ParseCoverageTable(GetFont(), data + offset_coverage,
+ length - offset_coverage, this->m_num_glyphs)) {
+ return Error("Failed to parse coverage table for mark set %d", i);
}
}
- font->gdef->num_mark_glyph_sets = mark_set_count;
+ this->num_mark_glyph_sets = mark_set_count;
return true;
}
-} // namespace
+bool OpenTypeGDEF::Parse(const uint8_t *data, size_t length) {
+ OpenTypeMAXP *maxp = static_cast<OpenTypeMAXP*>(
+ GetFont()->GetTypedTable(OTS_TAG_MAXP));
-namespace ots {
-
-bool ots_gdef_parse(Font *font, const uint8_t *data, size_t length) {
// Grab the number of glyphs in the font from the maxp table to check
// GlyphIDs in GDEF table.
- if (!font->maxp) {
- return OTS_FAILURE_MSG("No maxp table in font, needed by GDEF");
+ if (!maxp) {
+ return Error("No maxp table in font, needed by GDEF");
}
- const uint16_t num_glyphs = font->maxp->num_glyphs;
+ this->m_num_glyphs = maxp->num_glyphs;
Buffer table(data, length);
- OpenTypeGDEF *gdef = new OpenTypeGDEF;
- font->gdef = gdef;
-
- uint32_t version = 0;
- if (!table.ReadU32(&version)) {
- return OTS_FAILURE_MSG("Incomplete table");
+ uint16_t version_major = 0, version_minor = 0;
+ if (!table.ReadU16(&version_major) ||
+ !table.ReadU16(&version_minor)) {
+ return Error("Incomplete table");
}
- if (version < 0x00010000 || version == 0x00010001) {
- return OTS_FAILURE_MSG("Bad version");
- }
-
- if (version >= 0x00010002) {
- gdef->version_2 = true;
+ if (version_major != 1 || version_minor == 1) { // there is no v1.1
+ return Error("Bad version");
}
uint16_t offset_glyph_class_def = 0;
@@ -264,110 +257,108 @@ bool ots_gdef_parse(Font *font, const uint8_t *data, size_t length) {
!table.ReadU16(&offset_attach_list) ||
!table.ReadU16(&offset_lig_caret_list) ||
!table.ReadU16(&offset_mark_attach_class_def)) {
- return OTS_FAILURE_MSG("Incomplete table");
+ return Error("Incomplete table");
}
uint16_t offset_mark_glyph_sets_def = 0;
- if (gdef->version_2) {
+ if (version_minor >= 2) {
if (!table.ReadU16(&offset_mark_glyph_sets_def)) {
- return OTS_FAILURE_MSG("Incomplete table");
+ return Error("Incomplete table");
+ }
+ }
+ uint32_t item_var_store_offset = 0;
+ if (version_minor >= 3) {
+ if (!table.ReadU32(&item_var_store_offset)) {
+ return Error("Incomplete table");
}
}
unsigned gdef_header_end = 4 + 4 * 2;
- if (gdef->version_2)
+ if (version_minor >= 2)
gdef_header_end += 2;
+ if (version_minor >= 3)
+ gdef_header_end += 4;
// Parse subtables
if (offset_glyph_class_def) {
if (offset_glyph_class_def >= length ||
offset_glyph_class_def < gdef_header_end) {
- return OTS_FAILURE_MSG("Invalid offset to glyph classes");
+ return Error("Invalid offset to glyph classes");
}
- if (!ParseGlyphClassDefTable(font, data + offset_glyph_class_def,
+ if (!ots::ParseClassDefTable(GetFont(), data + offset_glyph_class_def,
length - offset_glyph_class_def,
- num_glyphs)) {
- return OTS_FAILURE_MSG("Invalid glyph classes");
+ this->m_num_glyphs, kMaxGlyphClassDefValue)) {
+ return Error("Invalid glyph classes");
}
- gdef->has_glyph_class_def = true;
}
if (offset_attach_list) {
if (offset_attach_list >= length ||
offset_attach_list < gdef_header_end) {
- return OTS_FAILURE_MSG("Invalid offset to attachment list");
+ return Error("Invalid offset to attachment list");
}
- if (!ParseAttachListTable(font, data + offset_attach_list,
- length - offset_attach_list,
- num_glyphs)) {
- return OTS_FAILURE_MSG("Invalid attachment list");
+ if (!ParseAttachListTable(data + offset_attach_list,
+ length - offset_attach_list)) {
+ return Error("Invalid attachment list");
}
}
if (offset_lig_caret_list) {
if (offset_lig_caret_list >= length ||
offset_lig_caret_list < gdef_header_end) {
- return OTS_FAILURE_MSG("Invalid offset to ligature caret list");
+ return Error("Invalid offset to ligature caret list");
}
- if (!ParseLigCaretListTable(font, data + offset_lig_caret_list,
- length - offset_lig_caret_list,
- num_glyphs)) {
- return OTS_FAILURE_MSG("Invalid ligature caret list");
+ if (!ParseLigCaretListTable(data + offset_lig_caret_list,
+ length - offset_lig_caret_list)) {
+ return Error("Invalid ligature caret list");
}
}
if (offset_mark_attach_class_def) {
if (offset_mark_attach_class_def >= length ||
offset_mark_attach_class_def < gdef_header_end) {
- return OTS_FAILURE_MSG("Invalid offset to mark attachment list");
+ return Error("Invalid offset to mark attachment list");
}
- if (!ParseMarkAttachClassDefTable(font,
- data + offset_mark_attach_class_def,
- length - offset_mark_attach_class_def,
- num_glyphs)) {
- return OTS_FAILURE_MSG("Invalid mark attachment list");
+ if (!ots::ParseClassDefTable(GetFont(),
+ data + offset_mark_attach_class_def,
+ length - offset_mark_attach_class_def,
+ this->m_num_glyphs, kMaxClassDefValue)) {
+ return Error("Invalid mark attachment list");
}
- gdef->has_mark_attachment_class_def = true;
}
if (offset_mark_glyph_sets_def) {
if (offset_mark_glyph_sets_def >= length ||
offset_mark_glyph_sets_def < gdef_header_end) {
- return OTS_FAILURE_MSG("invalid offset to mark glyph sets");
+ return Error("invalid offset to mark glyph sets");
}
- if (!ParseMarkGlyphSetsDefTable(font,
- data + offset_mark_glyph_sets_def,
- length - offset_mark_glyph_sets_def,
- num_glyphs)) {
- return OTS_FAILURE_MSG("Invalid mark glyph sets");
+ if (!ParseMarkGlyphSetsDefTable(data + offset_mark_glyph_sets_def,
+ length - offset_mark_glyph_sets_def)) {
+ return Error("Invalid mark glyph sets");
}
- gdef->has_mark_glyph_sets_def = true;
}
- gdef->data = data;
- gdef->length = length;
- return true;
-}
-
-bool ots_gdef_should_serialise(Font *font) {
- return font->gdef != NULL && font->gdef->data != NULL;
-}
-bool ots_gdef_serialise(OTSStream *out, Font *font) {
- if (!out->Write(font->gdef->data, font->gdef->length)) {
- return OTS_FAILURE_MSG("Failed to write GDEF table");
+ if (item_var_store_offset) {
+ if (item_var_store_offset >= length ||
+ item_var_store_offset < gdef_header_end) {
+ return Error("invalid offset to item variation store");
+ }
+ if (!ParseItemVariationStore(GetFont(), data + item_var_store_offset,
+ length - item_var_store_offset)) {
+ return Error("Invalid item variation store");
+ }
}
+ this->m_data = data;
+ this->m_length = length;
return true;
}
-void ots_gdef_reuse(Font *font, Font *other) {
- font->gdef = other->gdef;
- font->gdef_reused = true;
-}
+bool OpenTypeGDEF::Serialize(OTSStream *out) {
+ if (!out->Write(this->m_data, this->m_length)) {
+ return Error("Failed to write table");
+ }
-void ots_gdef_free(Font *font) {
- delete font->gdef;
+ return true;
}
} // namespace ots
-
-#undef TABLE_NAME
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-03 01:57:03 +0000