gecko/gfx/ots/src/maxp.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 "maxp.h"
// maxp - Maximum Profile
// http://www.microsoft.com/opentype/otspec/maxp.htm
namespace ots {
bool ots_maxp_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
Buffer table(data, length);
OpenTypeMAXP *maxp = new OpenTypeMAXP;
file->maxp = maxp;
uint32_t version = 0;
if (!table.ReadU32(&version)) {
return OTS_FAILURE();
}
if (version >> 16 > 1) {
return OTS_FAILURE();
}
if (!table.ReadU16(&maxp->num_glyphs)) {
return OTS_FAILURE();
}
if (!maxp->num_glyphs) {
return OTS_FAILURE();
}
if (version >> 16 == 1) {
maxp->version_1 = true;
if (!table.ReadU16(&maxp->max_points) ||
!table.ReadU16(&maxp->max_contours) ||
!table.ReadU16(&maxp->max_c_points) ||
!table.ReadU16(&maxp->max_c_contours) ||
!table.ReadU16(&maxp->max_zones) ||
!table.ReadU16(&maxp->max_t_points) ||
!table.ReadU16(&maxp->max_storage) ||
!table.ReadU16(&maxp->max_fdefs) ||
!table.ReadU16(&maxp->max_idefs) ||
!table.ReadU16(&maxp->max_stack) ||
!table.ReadU16(&maxp->max_size_glyf_instructions) ||
!table.ReadU16(&maxp->max_c_components) ||
!table.ReadU16(&maxp->max_c_depth)) {
return OTS_FAILURE();
}
if (maxp->max_zones == 0) {
// workaround for ipa*.ttf Japanese fonts.
OTS_WARNING("bad max_zones: %u", maxp->max_zones);
maxp->max_zones = 1;
} else if (maxp->max_zones == 3) {
// workaround for Ecolier-*.ttf fonts.
OTS_WARNING("bad max_zones: %u", maxp->max_zones);
maxp->max_zones = 2;
}
if ((maxp->max_zones != 1) && (maxp->max_zones != 2)) {
return OTS_FAILURE();
}
} else {
maxp->version_1 = false;
}
return true;
}
bool ots_maxp_should_serialise(OpenTypeFile *file) {
return file->maxp;
}
bool ots_maxp_serialise(OTSStream *out, OpenTypeFile *file) {
const OpenTypeMAXP *maxp = file->maxp;
if (!out->WriteU32(maxp->version_1 ? 0x00010000 : 0x00005000) ||
!out->WriteU16(maxp->num_glyphs)) {
return OTS_FAILURE();
}
if (!maxp->version_1) return true;
if (!out->WriteU16(maxp->max_points) ||
!out->WriteU16(maxp->max_contours) ||
!out->WriteU16(maxp->max_c_points) ||
!out->WriteU16(maxp->max_c_contours)) {
return OTS_FAILURE();
}
if (g_transcode_hints) {
if (!out->WriteU16(maxp->max_zones) ||
!out->WriteU16(maxp->max_t_points) ||
!out->WriteU16(maxp->max_storage) ||
!out->WriteU16(maxp->max_fdefs) ||
!out->WriteU16(maxp->max_idefs) ||
!out->WriteU16(maxp->max_stack) ||
!out->WriteU16(maxp->max_size_glyf_instructions)) {
return OTS_FAILURE();
}
} else {
if (!out->WriteU16(1) || // max zones
!out->WriteU16(0) || // max twilight points
!out->WriteU16(0) || // max storage
!out->WriteU16(0) || // max function defs
!out->WriteU16(0) || // max instruction defs
!out->WriteU16(0) || // max stack elements
!out->WriteU16(0)) { // max instruction byte count
return OTS_FAILURE();
}
}
if (!out->WriteU16(maxp->max_c_components) ||
!out->WriteU16(maxp->max_c_depth)) {
return OTS_FAILURE();
}
return true;
}
void ots_maxp_free(OpenTypeFile *file) {
delete file->maxp;
}
} // namespace ots