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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/vdmx.cc
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'gfx/ots/src/vdmx.cc')
-rw-r--r--gfx/ots/src/vdmx.cc186
1 files changed, 186 insertions, 0 deletions
diff --git a/gfx/ots/src/vdmx.cc b/gfx/ots/src/vdmx.cc
new file mode 100644
index 000000000..cd80946ae
--- /dev/null
+++ b/gfx/ots/src/vdmx.cc
@@ -0,0 +1,186 @@
+// 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 "vdmx.h"
+
+// VDMX - Vertical Device Metrics
+// http://www.microsoft.com/typography/otspec/vdmx.htm
+
+#define TABLE_NAME "VDMX"
+
+#define DROP_THIS_TABLE(...) \
+ do { \
+ OTS_FAILURE_MSG_(font->file, TABLE_NAME ": " __VA_ARGS__); \
+ OTS_FAILURE_MSG("Table discarded"); \
+ delete font->vdmx; \
+ font->vdmx = 0; \
+ } while (0)
+
+namespace ots {
+
+bool ots_vdmx_parse(Font *font, const uint8_t *data, size_t length) {
+ Buffer table(data, length);
+ font->vdmx = new OpenTypeVDMX;
+ OpenTypeVDMX * const vdmx = font->vdmx;
+
+ if (!table.ReadU16(&vdmx->version) ||
+ !table.ReadU16(&vdmx->num_recs) ||
+ !table.ReadU16(&vdmx->num_ratios)) {
+ return OTS_FAILURE_MSG("Failed to read table header");
+ }
+
+ if (vdmx->version > 1) {
+ DROP_THIS_TABLE("bad version: %u", vdmx->version);
+ return true; // continue transcoding
+ }
+
+ vdmx->rat_ranges.reserve(vdmx->num_ratios);
+ for (unsigned i = 0; i < vdmx->num_ratios; ++i) {
+ OpenTypeVDMXRatioRecord rec;
+
+ if (!table.ReadU8(&rec.charset) ||
+ !table.ReadU8(&rec.x_ratio) ||
+ !table.ReadU8(&rec.y_start_ratio) ||
+ !table.ReadU8(&rec.y_end_ratio)) {
+ return OTS_FAILURE_MSG("Failed to read ratio header %d", i);
+ }
+
+ if (rec.charset > 1) {
+ DROP_THIS_TABLE("bad charset: %u", rec.charset);
+ return true;
+ }
+
+ if (rec.y_start_ratio > rec.y_end_ratio) {
+ DROP_THIS_TABLE("bad y ratio");
+ return true;
+ }
+
+ // All values set to zero signal the default grouping to use;
+ // if present, this must be the last Ratio group in the table.
+ if ((i < vdmx->num_ratios - 1u) &&
+ (rec.x_ratio == 0) &&
+ (rec.y_start_ratio == 0) &&
+ (rec.y_end_ratio == 0)) {
+ // workaround for fonts which have 2 or more {0, 0, 0} terminators.
+ DROP_THIS_TABLE("superfluous terminator found");
+ return true;
+ }
+
+ vdmx->rat_ranges.push_back(rec);
+ }
+
+ vdmx->offsets.reserve(vdmx->num_ratios);
+ const size_t current_offset = table.offset();
+ // current_offset is less than (2 bytes * 3) + (4 bytes * USHRT_MAX) = 256k.
+ for (unsigned i = 0; i < vdmx->num_ratios; ++i) {
+ uint16_t offset;
+ if (!table.ReadU16(&offset)) {
+ return OTS_FAILURE_MSG("Failed to read ratio offset %d", i);
+ }
+ if (current_offset + offset >= length) { // thus doesn't overflow.
+ return OTS_FAILURE_MSG("Bad ratio offset %d for ration %d", offset, i);
+ }
+
+ vdmx->offsets.push_back(offset);
+ }
+
+ vdmx->groups.reserve(vdmx->num_recs);
+ for (unsigned i = 0; i < vdmx->num_recs; ++i) {
+ OpenTypeVDMXGroup group;
+ if (!table.ReadU16(&group.recs) ||
+ !table.ReadU8(&group.startsz) ||
+ !table.ReadU8(&group.endsz)) {
+ return OTS_FAILURE_MSG("Failed to read record header %d", i);
+ }
+ group.entries.reserve(group.recs);
+ for (unsigned j = 0; j < group.recs; ++j) {
+ OpenTypeVDMXVTable vt;
+ if (!table.ReadU16(&vt.y_pel_height) ||
+ !table.ReadS16(&vt.y_max) ||
+ !table.ReadS16(&vt.y_min)) {
+ return OTS_FAILURE_MSG("Failed to read reacord %d group %d", i, j);
+ }
+ if (vt.y_max < vt.y_min) {
+ DROP_THIS_TABLE("bad y min/max");
+ return true;
+ }
+
+ // This table must appear in sorted order (sorted by yPelHeight),
+ // but need not be continuous.
+ if ((j != 0) && (group.entries[j - 1].y_pel_height >= vt.y_pel_height)) {
+ DROP_THIS_TABLE("the table is not sorted");
+ return true;
+ }
+
+ group.entries.push_back(vt);
+ }
+ vdmx->groups.push_back(group);
+ }
+
+ return true;
+}
+
+bool ots_vdmx_should_serialise(Font *font) {
+ if (!font->glyf) return false; // this table is not for CFF fonts.
+ return font->vdmx != NULL;
+}
+
+bool ots_vdmx_serialise(OTSStream *out, Font *font) {
+ OpenTypeVDMX * const vdmx = font->vdmx;
+
+ if (!out->WriteU16(vdmx->version) ||
+ !out->WriteU16(vdmx->num_recs) ||
+ !out->WriteU16(vdmx->num_ratios)) {
+ return OTS_FAILURE_MSG("Failed to write table header");
+ }
+
+ for (unsigned i = 0; i < vdmx->rat_ranges.size(); ++i) {
+ const OpenTypeVDMXRatioRecord& rec = vdmx->rat_ranges[i];
+ if (!out->Write(&rec.charset, 1) ||
+ !out->Write(&rec.x_ratio, 1) ||
+ !out->Write(&rec.y_start_ratio, 1) ||
+ !out->Write(&rec.y_end_ratio, 1)) {
+ return OTS_FAILURE_MSG("Failed to write ratio %d", i);
+ }
+ }
+
+ for (unsigned i = 0; i < vdmx->offsets.size(); ++i) {
+ if (!out->WriteU16(vdmx->offsets[i])) {
+ return OTS_FAILURE_MSG("Failed to write ratio offset %d", i);
+ }
+ }
+
+ for (unsigned i = 0; i < vdmx->groups.size(); ++i) {
+ const OpenTypeVDMXGroup& group = vdmx->groups[i];
+ if (!out->WriteU16(group.recs) ||
+ !out->Write(&group.startsz, 1) ||
+ !out->Write(&group.endsz, 1)) {
+ return OTS_FAILURE_MSG("Failed to write group %d", i);
+ }
+ for (unsigned j = 0; j < group.entries.size(); ++j) {
+ const OpenTypeVDMXVTable& vt = group.entries[j];
+ if (!out->WriteU16(vt.y_pel_height) ||
+ !out->WriteS16(vt.y_max) ||
+ !out->WriteS16(vt.y_min)) {
+ return OTS_FAILURE_MSG("Failed to write group %d entry %d", i, j);
+ }
+ }
+ }
+
+ return true;
+}
+
+void ots_vdmx_reuse(Font *font, Font *other) {
+ font->vdmx = other->vdmx;
+ font->vdmx_reused = true;
+}
+
+void ots_vdmx_free(Font *font) {
+ delete font->vdmx;
+}
+
+} // namespace ots
+
+#undef TABLE_NAME
+#undef DROP_THIS_TABLE