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-rw-r--r--gfx/ots/src/head.cc132
1 files changed, 132 insertions, 0 deletions
diff --git a/gfx/ots/src/head.cc b/gfx/ots/src/head.cc
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+++ b/gfx/ots/src/head.cc
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+// Copyright (c) 2009-2017 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.
+
+#include "head.h"
+
+#include <cstring>
+
+// head - Font Header
+// http://www.microsoft.com/typography/otspec/head.htm
+
+namespace ots {
+
+bool OpenTypeHEAD::Parse(const uint8_t *data, size_t length) {
+ Buffer table(data, length);
+
+ uint32_t version = 0;
+ if (!table.ReadU32(&version) ||
+ !table.ReadU32(&this->revision)) {
+ return Error("Failed to read table header");
+ }
+
+ if (version >> 16 != 1) {
+ return Error("Unsupported majorVersion: %d", version >> 16);
+ }
+
+ // Skip the checksum adjustment
+ if (!table.Skip(4)) {
+ return Error("Failed to read checksum");
+ }
+
+ uint32_t magic;
+ if (!table.ReadU32(&magic) || magic != 0x5F0F3CF5) {
+ return Error("Failed to read or incorrect magicNumber");
+ }
+
+ if (!table.ReadU16(&this->flags)) {
+ return Error("Failed to read flags");
+ }
+
+ // We allow bits 0..4, 11..13
+ this->flags &= 0x381f;
+
+ if (!table.ReadU16(&this->upem)) {
+ return Error("Failed to read unitsPerEm");
+ }
+
+ // upem must be in range
+ if (this->upem < 16 ||
+ this->upem > 16384) {
+ return Error("unitsPerEm on in the range [16, 16384]: %d", this->upem);
+ }
+
+ if (!table.ReadR64(&this->created) ||
+ !table.ReadR64(&this->modified)) {
+ return Error("Can't read font dates");
+ }
+
+ if (!table.ReadS16(&this->xmin) ||
+ !table.ReadS16(&this->ymin) ||
+ !table.ReadS16(&this->xmax) ||
+ !table.ReadS16(&this->ymax)) {
+ return Error("Failed to read font bounding box");
+ }
+
+ if (this->xmin > this->xmax) {
+ return Error("Bad x dimension in the font bounding box (%d, %d)",
+ this->xmin, this->xmax);
+ }
+ if (this->ymin > this->ymax) {
+ return Error("Bad y dimension in the font bounding box (%d, %d)",
+ this->ymin, this->ymax);
+ }
+
+ if (!table.ReadU16(&this->mac_style)) {
+ return Error("Failed to read macStyle");
+ }
+
+ // We allow bits 0..6
+ this->mac_style &= 0x7f;
+
+ if (!table.ReadU16(&this->min_ppem)) {
+ return Error("Failed to read lowestRecPPEM");
+ }
+
+ // We don't care about the font direction hint
+ if (!table.Skip(2)) {
+ return Error("Failed to read fontDirectionHint");
+ }
+
+ if (!table.ReadS16(&this->index_to_loc_format)) {
+ return Error("Failed to read indexToLocFormat");
+ }
+ if (this->index_to_loc_format < 0 ||
+ this->index_to_loc_format > 1) {
+ return Error("Bad indexToLocFormat %d", this->index_to_loc_format);
+ }
+
+ int16_t glyph_data_format;
+ if (!table.ReadS16(&glyph_data_format) ||
+ glyph_data_format) {
+ return Error("Failed to read or bad glyphDataFormat");
+ }
+
+ return true;
+}
+
+bool OpenTypeHEAD::Serialize(OTSStream *out) {
+ if (!out->WriteU32(0x00010000) ||
+ !out->WriteU32(this->revision) ||
+ !out->WriteU32(0) || // check sum not filled in yet
+ !out->WriteU32(0x5F0F3CF5) ||
+ !out->WriteU16(this->flags) ||
+ !out->WriteU16(this->upem) ||
+ !out->WriteR64(this->created) ||
+ !out->WriteR64(this->modified) ||
+ !out->WriteS16(this->xmin) ||
+ !out->WriteS16(this->ymin) ||
+ !out->WriteS16(this->xmax) ||
+ !out->WriteS16(this->ymax) ||
+ !out->WriteU16(this->mac_style) ||
+ !out->WriteU16(this->min_ppem) ||
+ !out->WriteS16(2) ||
+ !out->WriteS16(this->index_to_loc_format) ||
+ !out->WriteS16(0)) {
+ return Error("Failed to write table");
+ }
+
+ return true;
+}
+
+} // namespace