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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/hdmx.cc
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'gfx/ots/src/hdmx.cc')
-rw-r--r--gfx/ots/src/hdmx.cc147
1 files changed, 147 insertions, 0 deletions
diff --git a/gfx/ots/src/hdmx.cc b/gfx/ots/src/hdmx.cc
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+++ b/gfx/ots/src/hdmx.cc
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+// 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 "hdmx.h"
+#include "head.h"
+#include "maxp.h"
+
+// hdmx - Horizontal Device Metrics
+// http://www.microsoft.com/typography/otspec/hdmx.htm
+
+#define TABLE_NAME "hdmx"
+
+#define DROP_THIS_TABLE(...) \
+ do { \
+ OTS_FAILURE_MSG_(font->file, TABLE_NAME ": " __VA_ARGS__); \
+ OTS_FAILURE_MSG("Table discarded"); \
+ delete font->hdmx; \
+ font->hdmx = 0; \
+ } while (0)
+
+namespace ots {
+
+bool ots_hdmx_parse(Font *font, const uint8_t *data, size_t length) {
+ Buffer table(data, length);
+ font->hdmx = new OpenTypeHDMX;
+ OpenTypeHDMX * const hdmx = font->hdmx;
+
+ if (!font->head || !font->maxp) {
+ return OTS_FAILURE_MSG("Missing maxp or head tables in font, needed by hdmx");
+ }
+
+ if ((font->head->flags & 0x14) == 0) {
+ // http://www.microsoft.com/typography/otspec/recom.htm
+ DROP_THIS_TABLE("the table should not be present when bit 2 and 4 of the "
+ "head->flags are not set");
+ return true;
+ }
+
+ int16_t num_recs;
+ if (!table.ReadU16(&hdmx->version) ||
+ !table.ReadS16(&num_recs) ||
+ !table.ReadS32(&hdmx->size_device_record)) {
+ return OTS_FAILURE_MSG("Failed to read hdmx header");
+ }
+ if (hdmx->version != 0) {
+ DROP_THIS_TABLE("bad version: %u", hdmx->version);
+ return true;
+ }
+ if (num_recs <= 0) {
+ DROP_THIS_TABLE("bad num_recs: %d", num_recs);
+ return true;
+ }
+ const int32_t actual_size_device_record = font->maxp->num_glyphs + 2;
+ if (hdmx->size_device_record < actual_size_device_record) {
+ DROP_THIS_TABLE("bad hdmx->size_device_record: %d", hdmx->size_device_record);
+ return true;
+ }
+
+ hdmx->pad_len = hdmx->size_device_record - actual_size_device_record;
+ if (hdmx->pad_len > 3) {
+ return OTS_FAILURE_MSG("Bad padding %d", hdmx->pad_len);
+ }
+
+ uint8_t last_pixel_size = 0;
+ hdmx->records.reserve(num_recs);
+ for (int i = 0; i < num_recs; ++i) {
+ OpenTypeHDMXDeviceRecord rec;
+
+ if (!table.ReadU8(&rec.pixel_size) ||
+ !table.ReadU8(&rec.max_width)) {
+ return OTS_FAILURE_MSG("Failed to read hdmx record %d", i);
+ }
+ if ((i != 0) &&
+ (rec.pixel_size <= last_pixel_size)) {
+ DROP_THIS_TABLE("records are not sorted");
+ return true;
+ }
+ last_pixel_size = rec.pixel_size;
+
+ rec.widths.reserve(font->maxp->num_glyphs);
+ for (unsigned j = 0; j < font->maxp->num_glyphs; ++j) {
+ uint8_t width;
+ if (!table.ReadU8(&width)) {
+ return OTS_FAILURE_MSG("Failed to read glyph width %d in record %d", j, i);
+ }
+ rec.widths.push_back(width);
+ }
+
+ if ((hdmx->pad_len > 0) &&
+ !table.Skip(hdmx->pad_len)) {
+ return OTS_FAILURE_MSG("Failed to skip padding %d", hdmx->pad_len);
+ }
+
+ hdmx->records.push_back(rec);
+ }
+
+ return true;
+}
+
+bool ots_hdmx_should_serialise(Font *font) {
+ if (!font->hdmx) return false;
+ if (!font->glyf) return false; // this table is not for CFF fonts.
+ return true;
+}
+
+bool ots_hdmx_serialise(OTSStream *out, Font *font) {
+ OpenTypeHDMX * const hdmx = font->hdmx;
+
+ const int16_t num_recs = static_cast<int16_t>(hdmx->records.size());
+ if (hdmx->records.size() >
+ static_cast<size_t>(std::numeric_limits<int16_t>::max()) ||
+ !out->WriteU16(hdmx->version) ||
+ !out->WriteS16(num_recs) ||
+ !out->WriteS32(hdmx->size_device_record)) {
+ return OTS_FAILURE_MSG("Failed to write hdmx header");
+ }
+
+ for (int16_t i = 0; i < num_recs; ++i) {
+ const OpenTypeHDMXDeviceRecord& rec = hdmx->records[i];
+ if (!out->Write(&rec.pixel_size, 1) ||
+ !out->Write(&rec.max_width, 1) ||
+ !out->Write(&rec.widths[0], rec.widths.size())) {
+ return OTS_FAILURE_MSG("Failed to write hdmx record %d", i);
+ }
+ if ((hdmx->pad_len > 0) &&
+ !out->Write((const uint8_t *)"\x00\x00\x00", hdmx->pad_len)) {
+ return OTS_FAILURE_MSG("Failed to write hdmx padding of length %d", hdmx->pad_len);
+ }
+ }
+
+ return true;
+}
+
+void ots_hdmx_reuse(Font *font, Font *other) {
+ font->hdmx = other->hdmx;
+ font->hdmx_reused = true;
+}
+
+void ots_hdmx_free(Font *font) {
+ delete font->hdmx;
+}
+
+} // namespace ots
+
+#undef TABLE_NAME
+#undef DROP_THIS_TABLE