summaryrefslogtreecommitdiffstats
path: root/gfx/ots/src/gasp.cc
diff options
context:
space:
mode:
authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /gfx/ots/src/gasp.cc
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
downloadUXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.gz
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.lz
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.xz
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.zip
Add m-esr52 at 52.6.0
Diffstat (limited to 'gfx/ots/src/gasp.cc')
-rw-r--r--gfx/ots/src/gasp.cc119
1 files changed, 119 insertions, 0 deletions
diff --git a/gfx/ots/src/gasp.cc b/gfx/ots/src/gasp.cc
new file mode 100644
index 000000000..5ebf5d84b
--- /dev/null
+++ b/gfx/ots/src/gasp.cc
@@ -0,0 +1,119 @@
+// Copyright (c) 2009 The Chromium 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 "gasp.h"
+
+// gasp - Grid-fitting And Scan-conversion Procedure
+// http://www.microsoft.com/typography/otspec/gasp.htm
+
+#define TABLE_NAME "gasp"
+
+#define DROP_THIS_TABLE(...) \
+ do { \
+ OTS_FAILURE_MSG_(font->file, TABLE_NAME ": " __VA_ARGS__); \
+ OTS_FAILURE_MSG("Table discarded"); \
+ delete font->gasp; \
+ font->gasp = 0; \
+ } while (0)
+
+namespace ots {
+
+bool ots_gasp_parse(Font *font, const uint8_t *data, size_t length) {
+ Buffer table(data, length);
+
+ OpenTypeGASP *gasp = new OpenTypeGASP;
+ font->gasp = gasp;
+
+ uint16_t num_ranges = 0;
+ if (!table.ReadU16(&gasp->version) ||
+ !table.ReadU16(&num_ranges)) {
+ return OTS_FAILURE_MSG("Failed to read table header");
+ }
+
+ if (gasp->version > 1) {
+ // Lots of Linux fonts have bad version numbers...
+ DROP_THIS_TABLE("bad version: %u", gasp->version);
+ return true;
+ }
+
+ if (num_ranges == 0) {
+ DROP_THIS_TABLE("num_ranges is zero");
+ return true;
+ }
+
+ gasp->gasp_ranges.reserve(num_ranges);
+ for (unsigned i = 0; i < num_ranges; ++i) {
+ uint16_t max_ppem = 0;
+ uint16_t behavior = 0;
+ if (!table.ReadU16(&max_ppem) ||
+ !table.ReadU16(&behavior)) {
+ return OTS_FAILURE_MSG("Failed to read subrange %d", i);
+ }
+ if ((i > 0) && (gasp->gasp_ranges[i - 1].first >= max_ppem)) {
+ // The records in the gaspRange[] array must be sorted in order of
+ // increasing rangeMaxPPEM value.
+ DROP_THIS_TABLE("ranges are not sorted");
+ return true;
+ }
+ if ((i == num_ranges - 1u) && // never underflow.
+ (max_ppem != 0xffffu)) {
+ DROP_THIS_TABLE("The last record should be 0xFFFF as a sentinel value "
+ "for rangeMaxPPEM");
+ return true;
+ }
+
+ if (behavior >> 8) {
+ OTS_WARNING("undefined bits are used: %x", behavior);
+ // mask undefined bits.
+ behavior &= 0x000fu;
+ }
+
+ if (gasp->version == 0 && (behavior >> 2) != 0) {
+ OTS_WARNING("changed the version number to 1");
+ gasp->version = 1;
+ }
+
+ gasp->gasp_ranges.push_back(std::make_pair(max_ppem, behavior));
+ }
+
+ return true;
+}
+
+bool ots_gasp_should_serialise(Font *font) {
+ return font->gasp != NULL;
+}
+
+bool ots_gasp_serialise(OTSStream *out, Font *font) {
+ const OpenTypeGASP *gasp = font->gasp;
+
+ const uint16_t num_ranges = static_cast<uint16_t>(gasp->gasp_ranges.size());
+ if (num_ranges != gasp->gasp_ranges.size() ||
+ !out->WriteU16(gasp->version) ||
+ !out->WriteU16(num_ranges)) {
+ return OTS_FAILURE_MSG("failed to write gasp header");
+ }
+
+ for (uint16_t i = 0; i < num_ranges; ++i) {
+ if (!out->WriteU16(gasp->gasp_ranges[i].first) ||
+ !out->WriteU16(gasp->gasp_ranges[i].second)) {
+ return OTS_FAILURE_MSG("Failed to write gasp subtable %d", i);
+ }
+ }
+
+ return true;
+}
+
+void ots_gasp_reuse(Font *font, Font *other) {
+ font->gasp = other->gasp;
+ font->gasp_reused = true;
+}
+
+void ots_gasp_free(Font *font) {
+ delete font->gasp;
+}
+
+} // namespace ots
+
+#undef TABLE_NAME
+#undef DROP_THIS_TABLE