mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
107 lines
2.7 KiB
C++
107 lines
2.7 KiB
C++
// 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/opentype/otspec/gasp.htm
|
|
|
|
#define DROP_THIS_TABLE \
|
|
do { delete file->gasp; file->gasp = 0; } while (0)
|
|
|
|
namespace ots {
|
|
|
|
bool ots_gasp_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
|
|
Buffer table(data, length);
|
|
|
|
OpenTypeGASP *gasp = new OpenTypeGASP;
|
|
file->gasp = gasp;
|
|
|
|
uint16_t num_ranges = 0;
|
|
if (!table.ReadU16(&gasp->version) ||
|
|
!table.ReadU16(&num_ranges)) {
|
|
return OTS_FAILURE();
|
|
}
|
|
|
|
if (gasp->version > 1) {
|
|
// Lots of Linux fonts have bad version numbers...
|
|
OTS_WARNING("bad version: %u", gasp->version);
|
|
DROP_THIS_TABLE;
|
|
return true;
|
|
}
|
|
|
|
if (num_ranges == 0) {
|
|
OTS_WARNING("num_ranges is zero");
|
|
DROP_THIS_TABLE;
|
|
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();
|
|
}
|
|
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.
|
|
OTS_WARNING("ranges are not sorted");
|
|
DROP_THIS_TABLE;
|
|
return true;
|
|
}
|
|
if ((i == num_ranges - 1u) && // never underflow.
|
|
(max_ppem != 0xffffu)) {
|
|
OTS_WARNING("The last record should be 0xFFFF as a sentinel value "
|
|
"for rangeMaxPPEM");
|
|
DROP_THIS_TABLE;
|
|
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(OpenTypeFile *file) {
|
|
return file->gasp != NULL;
|
|
}
|
|
|
|
bool ots_gasp_serialise(OTSStream *out, OpenTypeFile *file) {
|
|
const OpenTypeGASP *gasp = file->gasp;
|
|
|
|
if (!out->WriteU16(gasp->version) ||
|
|
!out->WriteU16(gasp->gasp_ranges.size())) {
|
|
return OTS_FAILURE();
|
|
}
|
|
|
|
for (unsigned i = 0; i < gasp->gasp_ranges.size(); ++i) {
|
|
if (!out->WriteU16(gasp->gasp_ranges[i].first) ||
|
|
!out->WriteU16(gasp->gasp_ranges[i].second)) {
|
|
return OTS_FAILURE();
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void ots_gasp_free(OpenTypeFile *file) {
|
|
delete file->gasp;
|
|
}
|
|
|
|
} // namespace ots
|