зеркало из https://github.com/mozilla/gecko-dev.git
Bug 719286 - Add OTS support for OpenType SVG table r=jfkthame
This commit is contained in:
Родитель
9b5bc40bde
Коммит
5e83da96d5
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@ -76,6 +76,7 @@ CPPSRCS = \
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gpos.cc \
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gsub.cc \
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graphite.cc \
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svg.cc \
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$(NULL)
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EXPORTS = \
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@ -172,6 +172,9 @@ const struct {
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ots::ots_glat_should_serialise, ots::ots_glat_free, false },
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{ "Feat", ots::ots_feat_parse, ots::ots_feat_serialise,
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ots::ots_feat_should_serialise, ots::ots_feat_free, false },
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// SVG glyph table
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{ "SVG ", ots::ots_svg_parse, ots::ots_svg_serialise,
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ots::ots_svg_should_serialise, ots::ots_svg_free, false},
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// TODO(bashi): Support mort, base, and jstf tables.
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{ 0, NULL, NULL, NULL, NULL, false },
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};
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@ -222,7 +222,8 @@ class Buffer {
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F(sill, SILL) \
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F(glat, GLAT) \
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F(gloc, GLOC) \
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F(feat, FEAT)
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F(feat, FEAT) \
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F(svg, SVG)
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#define F(name, capname) struct OpenType##capname;
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FOR_EACH_TABLE_TYPE
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@ -0,0 +1,125 @@
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// Copyright (c) 2012 Mozilla Foundation. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "ots.h"
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#include "svg.h"
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#define NONFATAL_FAILURE(msg) \
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do { \
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OTS_WARNING(msg); \
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delete file->svg; file->svg = 0; \
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return true; \
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} while (0)
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namespace ots {
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bool ots_svg_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
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Buffer table(data, length);
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OpenTypeSVG *svg = new OpenTypeSVG;
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file->svg = svg;
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std::map<uint32_t, uint32_t> doc_locations;
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typedef std::map<uint32_t, uint32_t>::iterator lociter_t;
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uint16_t version;
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uint16_t index_length;
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if (!table.ReadU16(&version) ||
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!table.ReadU16(&index_length)) {
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NONFATAL_FAILURE("Couldn't read SVG table header");
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}
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if (version != 1) {
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NONFATAL_FAILURE("Unknown SVG table version");
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}
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uint32_t max_address = 0;
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uint32_t total_docs_length = 0;
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uint16_t start_glyph;
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uint16_t end_glyph;
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uint32_t doc_offset;
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uint32_t doc_length;
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uint16_t last_end_glyph = 0;
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for (uint16_t i = 0; i < index_length; i++) {
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if (!table.ReadU16(&start_glyph) ||
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!table.ReadU16(&end_glyph) ||
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!table.ReadU32(&doc_offset) ||
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!table.ReadU32(&doc_length)) {
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NONFATAL_FAILURE("Couldn't read SVG table index");
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}
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if (end_glyph < start_glyph) {
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NONFATAL_FAILURE("Bad SVG table index range");
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}
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if (last_end_glyph && start_glyph < last_end_glyph) {
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NONFATAL_FAILURE("SVG table index range is not sorted");
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}
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if (doc_locations.find(doc_offset) != doc_locations.end()) {
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if (doc_locations[doc_offset] != doc_length) {
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NONFATAL_FAILURE("SVG table contains overlapping document range");
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}
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} else {
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doc_locations[doc_offset] = doc_length;
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total_docs_length += doc_length;
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if (doc_offset + doc_length > max_address) {
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max_address = doc_offset + doc_length;
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}
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}
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if (doc_offset > 1024 * 1024 * 1024 ||
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doc_length > 1024 * 1024 * 1024 ||
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total_docs_length > 1024 * 1024 * 1024) {
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NONFATAL_FAILURE("Bad SVG document length");
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}
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last_end_glyph = end_glyph;
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}
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uint32_t last_end = 4 + 12 * index_length;
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for (lociter_t iter = doc_locations.begin();
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iter != doc_locations.end(); ++iter) {
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if (iter->first != last_end) {
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NONFATAL_FAILURE("SVG table contains overlapping document range");
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}
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last_end = iter->first + iter->second;
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}
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if (max_address != length) {
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NONFATAL_FAILURE("Bad SVG document length");
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}
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if (!table.Skip(total_docs_length)) {
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NONFATAL_FAILURE("SVG table is too short");
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}
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svg->data = data;
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svg->length = length;
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return true;
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}
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bool ots_svg_serialise(OTSStream *out, OpenTypeFile *file) {
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OpenTypeSVG *svg = file->svg;
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if (!out->Write(svg->data, svg->length)) {
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return OTS_FAILURE();
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}
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return true;
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}
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bool ots_svg_should_serialise(OpenTypeFile *file) {
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return file->svg;
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}
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void ots_svg_free(OpenTypeFile *file) {
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delete file->svg;
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}
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}
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@ -0,0 +1,21 @@
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// Copyright (c) 2012 Mozilla Foundation. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef OTS_SVG_H
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#define OTS_SVG_H
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#include <map>
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#include "ots.h"
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namespace ots {
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struct OpenTypeSVG {
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const uint8_t *data;
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size_t length;
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};
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}
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#endif
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