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-rw-r--r--gfx/ots/src/metrics.cc180
1 files changed, 96 insertions, 84 deletions
diff --git a/gfx/ots/src/metrics.cc b/gfx/ots/src/metrics.cc
index cd89f4555..b49d73c5d 100644
--- a/gfx/ots/src/metrics.cc
+++ b/gfx/ots/src/metrics.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.
@@ -11,149 +11,163 @@
// http://www.microsoft.com/typography/otspec/hhea.htm
// http://www.microsoft.com/typography/otspec/vhea.htm
-#define TABLE_NAME "metrics" // XXX: use individual table names
-
namespace ots {
-bool ParseMetricsHeader(Font *font, Buffer *table,
- OpenTypeMetricsHeader *header) {
- if (!table->ReadS16(&header->ascent) ||
- !table->ReadS16(&header->descent) ||
- !table->ReadS16(&header->linegap) ||
- !table->ReadU16(&header->adv_width_max) ||
- !table->ReadS16(&header->min_sb1) ||
- !table->ReadS16(&header->min_sb2) ||
- !table->ReadS16(&header->max_extent) ||
- !table->ReadS16(&header->caret_slope_rise) ||
- !table->ReadS16(&header->caret_slope_run) ||
- !table->ReadS16(&header->caret_offset)) {
- return OTS_FAILURE_MSG("Failed to read metrics header");
+bool OpenTypeMetricsHeader::Parse(const uint8_t *data, size_t length) {
+ Buffer table(data, length);
+
+ // Skip already read version.
+ if (!table.Skip(4)) {
+ return false;
+ }
+
+ if (!table.ReadS16(&this->ascent) ||
+ !table.ReadS16(&this->descent) ||
+ !table.ReadS16(&this->linegap) ||
+ !table.ReadU16(&this->adv_width_max) ||
+ !table.ReadS16(&this->min_sb1) ||
+ !table.ReadS16(&this->min_sb2) ||
+ !table.ReadS16(&this->max_extent) ||
+ !table.ReadS16(&this->caret_slope_rise) ||
+ !table.ReadS16(&this->caret_slope_run) ||
+ !table.ReadS16(&this->caret_offset)) {
+ return Error("Failed to read table");
}
- if (header->ascent < 0) {
- OTS_WARNING("bad ascent: %d", header->ascent);
- header->ascent = 0;
+ if (this->ascent < 0) {
+ Warning("bad ascent: %d", this->ascent);
+ this->ascent = 0;
}
- if (header->linegap < 0) {
- OTS_WARNING("bad linegap: %d", header->linegap);
- header->linegap = 0;
+ if (this->linegap < 0) {
+ Warning("bad linegap: %d", this->linegap);
+ this->linegap = 0;
}
- if (!font->head) {
- return OTS_FAILURE_MSG("Missing head font table");
+ OpenTypeHEAD *head = static_cast<OpenTypeHEAD*>(
+ GetFont()->GetTypedTable(OTS_TAG_HEAD));
+ if (!head) {
+ return Error("Missing head font table");
}
// if the font is non-slanted, caret_offset should be zero.
- if (!(font->head->mac_style & 2) &&
- (header->caret_offset != 0)) {
- OTS_WARNING("bad caret offset: %d", header->caret_offset);
- header->caret_offset = 0;
+ if (!(head->mac_style & 2) &&
+ (this->caret_offset != 0)) {
+ Warning("bad caret offset: %d", this->caret_offset);
+ this->caret_offset = 0;
}
// skip the reserved bytes
- if (!table->Skip(8)) {
- return OTS_FAILURE_MSG("Failed to skip reserverd bytes");
+ if (!table.Skip(8)) {
+ return Error("Failed to read reserverd bytes");
}
int16_t data_format;
- if (!table->ReadS16(&data_format)) {
- return OTS_FAILURE_MSG("Failed to read data format");
+ if (!table.ReadS16(&data_format)) {
+ return Error("Failed to read metricDataFormat");
}
if (data_format) {
- return OTS_FAILURE_MSG("Bad data format %d", data_format);
+ return Error("Bad metricDataFormat: %d", data_format);
}
- if (!table->ReadU16(&header->num_metrics)) {
- return OTS_FAILURE_MSG("Failed to read number of metrics");
+ if (!table.ReadU16(&this->num_metrics)) {
+ return Error("Failed to read number of metrics");
}
- if (!font->maxp) {
- return OTS_FAILURE_MSG("Missing maxp font table");
+ OpenTypeMAXP *maxp = static_cast<OpenTypeMAXP*>(
+ GetFont()->GetTypedTable(OTS_TAG_MAXP));
+ if (!maxp) {
+ return Error("Missing maxp font table");
}
- if (header->num_metrics > font->maxp->num_glyphs) {
- return OTS_FAILURE_MSG("Bad number of metrics %d", header->num_metrics);
+ if (this->num_metrics > maxp->num_glyphs) {
+ return Error("Bad number of metrics %d", this->num_metrics);
}
return true;
}
-bool SerialiseMetricsHeader(const ots::Font *font,
- OTSStream *out,
- const OpenTypeMetricsHeader *header) {
- if (!out->WriteU32(header->version) ||
- !out->WriteS16(header->ascent) ||
- !out->WriteS16(header->descent) ||
- !out->WriteS16(header->linegap) ||
- !out->WriteU16(header->adv_width_max) ||
- !out->WriteS16(header->min_sb1) ||
- !out->WriteS16(header->min_sb2) ||
- !out->WriteS16(header->max_extent) ||
- !out->WriteS16(header->caret_slope_rise) ||
- !out->WriteS16(header->caret_slope_run) ||
- !out->WriteS16(header->caret_offset) ||
+bool OpenTypeMetricsHeader::Serialize(OTSStream *out) {
+ if (!out->WriteU32(this->version) ||
+ !out->WriteS16(this->ascent) ||
+ !out->WriteS16(this->descent) ||
+ !out->WriteS16(this->linegap) ||
+ !out->WriteU16(this->adv_width_max) ||
+ !out->WriteS16(this->min_sb1) ||
+ !out->WriteS16(this->min_sb2) ||
+ !out->WriteS16(this->max_extent) ||
+ !out->WriteS16(this->caret_slope_rise) ||
+ !out->WriteS16(this->caret_slope_run) ||
+ !out->WriteS16(this->caret_offset) ||
!out->WriteR64(0) || // reserved
!out->WriteS16(0) || // metric data format
- !out->WriteU16(header->num_metrics)) {
- return OTS_FAILURE_MSG("Failed to write metrics");
+ !out->WriteU16(this->num_metrics)) {
+ return Error("Failed to write metrics");
}
return true;
}
-bool ParseMetricsTable(const ots::Font *font,
- Buffer *table,
- const uint16_t num_glyphs,
- const OpenTypeMetricsHeader *header,
- OpenTypeMetricsTable *metrics) {
+bool OpenTypeMetricsTable::Parse(const uint8_t *data, size_t length) {
+ Buffer table(data, length);
+
+ // OpenTypeMetricsHeader is a superclass of both 'hhea' and 'vhea',
+ // so the cast here is OK, whichever m_header_tag we have.
+ OpenTypeMetricsHeader *header = static_cast<OpenTypeMetricsHeader*>(
+ GetFont()->GetTypedTable(m_header_tag));
+ if (!header) {
+ return Error("Required %c%c%c%c table missing", OTS_UNTAG(m_header_tag));
+ }
// |num_metrics| is a uint16_t, so it's bounded < 65536. This limits that
// amount of memory that we'll allocate for this to a sane amount.
const unsigned num_metrics = header->num_metrics;
- if (num_metrics > num_glyphs) {
- return OTS_FAILURE_MSG("Bad number of metrics %d", num_metrics);
+ OpenTypeMAXP *maxp = static_cast<OpenTypeMAXP*>(
+ GetFont()->GetTypedTable(OTS_TAG_MAXP));
+ if (!maxp) {
+ return Error("Required maxp table missing");
+ }
+ if (num_metrics > maxp->num_glyphs) {
+ return Error("Bad number of metrics %d", num_metrics);
}
if (!num_metrics) {
- return OTS_FAILURE_MSG("No metrics!");
+ return Error("No metrics!");
}
- const unsigned num_sbs = num_glyphs - num_metrics;
+ const unsigned num_sbs = maxp->num_glyphs - num_metrics;
- metrics->entries.reserve(num_metrics);
+ this->entries.reserve(num_metrics);
for (unsigned i = 0; i < num_metrics; ++i) {
uint16_t adv = 0;
int16_t sb = 0;
- if (!table->ReadU16(&adv) || !table->ReadS16(&sb)) {
- return OTS_FAILURE_MSG("Failed to read metric %d", i);
+ if (!table.ReadU16(&adv) || !table.ReadS16(&sb)) {
+ return Error("Failed to read metric %d", i);
}
- metrics->entries.push_back(std::make_pair(adv, sb));
+ this->entries.push_back(std::make_pair(adv, sb));
}
- metrics->sbs.reserve(num_sbs);
+ this->sbs.reserve(num_sbs);
for (unsigned i = 0; i < num_sbs; ++i) {
int16_t sb;
- if (!table->ReadS16(&sb)) {
+ if (!table.ReadS16(&sb)) {
// Some Japanese fonts (e.g., mona.ttf) fail this test.
- return OTS_FAILURE_MSG("Failed to read side bearing %d", i + num_metrics);
+ return Error("Failed to read side bearing %d", i + num_metrics);
}
- metrics->sbs.push_back(sb);
+ this->sbs.push_back(sb);
}
return true;
}
-bool SerialiseMetricsTable(const ots::Font *font,
- OTSStream *out,
- const OpenTypeMetricsTable *metrics) {
- for (unsigned i = 0; i < metrics->entries.size(); ++i) {
- if (!out->WriteU16(metrics->entries[i].first) ||
- !out->WriteS16(metrics->entries[i].second)) {
- return OTS_FAILURE_MSG("Failed to write metric %d", i);
+bool OpenTypeMetricsTable::Serialize(OTSStream *out) {
+ for (unsigned i = 0; i < this->entries.size(); ++i) {
+ if (!out->WriteU16(this->entries[i].first) ||
+ !out->WriteS16(this->entries[i].second)) {
+ return Error("Failed to write metric %d", i);
}
}
- for (unsigned i = 0; i < metrics->sbs.size(); ++i) {
- if (!out->WriteS16(metrics->sbs[i])) {
- return OTS_FAILURE_MSG("Failed to write side bearing %ld", i + metrics->entries.size());
+ for (unsigned i = 0; i < this->sbs.size(); ++i) {
+ if (!out->WriteS16(this->sbs[i])) {
+ return Error("Failed to write side bearing %ld", i + this->entries.size());
}
}
@@ -161,5 +175,3 @@ bool SerialiseMetricsTable(const ots::Font *font,
}
} // namespace ots
-
-#undef TABLE_NAME
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 07:37:44 +0000