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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 01:47:29 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 01:47:29 +0000
commit0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d (patch)
treea31f07c9bcca9d56ce61e9a1ffd30ef350d513aa /gfx/ots/src/ltsh.cc
parentInitial commit. (diff)
downloadfirefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.tar.xz
firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.zip
Adding upstream version 115.8.0esr.upstream/115.8.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'gfx/ots/src/ltsh.cc')
-rw-r--r--gfx/ots/src/ltsh.cc71
1 files changed, 71 insertions, 0 deletions
diff --git a/gfx/ots/src/ltsh.cc b/gfx/ots/src/ltsh.cc
new file mode 100644
index 0000000000..4c40c5eb77
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+++ b/gfx/ots/src/ltsh.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 "ltsh.h"
+
+#include "maxp.h"
+
+// LTSH - Linear Threshold
+// http://www.microsoft.com/typography/otspec/ltsh.htm
+
+namespace ots {
+
+bool OpenTypeLTSH::Parse(const uint8_t *data, size_t length) {
+ Buffer table(data, length);
+
+ OpenTypeMAXP *maxp = static_cast<OpenTypeMAXP*>(
+ GetFont()->GetTypedTable(OTS_TAG_MAXP));
+ if (!maxp) {
+ return Error("Required maxp table is missing");
+ }
+
+ uint16_t num_glyphs = 0;
+ if (!table.ReadU16(&this->version) ||
+ !table.ReadU16(&num_glyphs)) {
+ return Error("Failed to read table header");
+ }
+
+ if (this->version != 0) {
+ return Drop("Unsupported version: %u", this->version);
+ }
+
+ if (num_glyphs != maxp->num_glyphs) {
+ return Drop("Bad numGlyphs: %u", num_glyphs);
+ }
+
+ this->ypels.reserve(num_glyphs);
+ for (unsigned i = 0; i < num_glyphs; ++i) {
+ uint8_t pel = 0;
+ if (!table.ReadU8(&pel)) {
+ return Error("Failed to read pixels for glyph %d", i);
+ }
+ this->ypels.push_back(pel);
+ }
+
+ return true;
+}
+
+bool OpenTypeLTSH::Serialize(OTSStream *out) {
+ const uint16_t num_ypels = static_cast<uint16_t>(this->ypels.size());
+ if (num_ypels != this->ypels.size() ||
+ !out->WriteU16(this->version) ||
+ !out->WriteU16(num_ypels)) {
+ return Error("Failed to write table header");
+ }
+ for (uint16_t i = 0; i < num_ypels; ++i) {
+ if (!out->Write(&(this->ypels[i]), 1)) {
+ return Error("Failed to write pixel size for glyph %d", i);
+ }
+ }
+
+ return true;
+}
+
+bool OpenTypeLTSH::ShouldSerialize() {
+ return Table::ShouldSerialize() &&
+ // this table is not for CFF fonts.
+ GetFont()->GetTable(OTS_TAG_GLYF) != NULL;
+}
+
+} // namespace ots