1d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org// Copyright (c) 2009 The Chromium Authors. All rights reserved. 2d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org// Use of this source code is governed by a BSD-style license that can be 3d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org// found in the LICENSE file. 4d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 5d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org#include "hdmx.h" 6d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org#include "head.h" 7d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org#include "maxp.h" 8d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 9d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org// hdmx - Horizontal Device Metrics 10d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org// http://www.microsoft.com/opentype/otspec/hdmx.htm 11d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 12d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org#define DROP_THIS_TABLE \ 13d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org do { delete file->hdmx; file->hdmx = 0; } while (0) 14d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 15d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.orgnamespace ots { 16d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 17d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.orgbool ots_hdmx_parse(OpenTypeFile *file, const uint8_t *data, size_t length) { 18d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org Buffer table(data, length); 19d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org file->hdmx = new OpenTypeHDMX; 20d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org OpenTypeHDMX * const hdmx = file->hdmx; 21d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 22d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org if (!file->head || !file->maxp) { 23d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return OTS_FAILURE(); 24d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 25d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 26d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org if ((file->head->flags & 0x14) == 0) { 27a4099a3bb81adafc5593090c1185ec82933a3d6eyusukes@chromium.org // http://www.microsoft.com/typography/otspec/recom.htm 28d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org OTS_WARNING("the table should not be present when bit 2 and 4 of the " 29d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org "head->flags are not set"); 30d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org DROP_THIS_TABLE; 31d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return true; 32d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 33d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 34d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org int16_t num_recs; 35d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org if (!table.ReadU16(&hdmx->version) || 36d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org !table.ReadS16(&num_recs) || 37d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org !table.ReadS32(&hdmx->size_device_record)) { 38d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return OTS_FAILURE(); 39d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 40d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org if (hdmx->version != 0) { 41d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org OTS_WARNING("bad version: %u", hdmx->version); 42d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org DROP_THIS_TABLE; 43d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return true; 44d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 45d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org if (num_recs <= 0) { 46d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org OTS_WARNING("bad num_recs: %d", num_recs); 47d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org DROP_THIS_TABLE; 48d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return true; 49d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 50a4099a3bb81adafc5593090c1185ec82933a3d6eyusukes@chromium.org const int32_t actual_size_device_record = file->maxp->num_glyphs + 2; 51a4099a3bb81adafc5593090c1185ec82933a3d6eyusukes@chromium.org if (hdmx->size_device_record < actual_size_device_record) { 52d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org OTS_WARNING("bad hdmx->size_device_record: %d", hdmx->size_device_record); 53d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org DROP_THIS_TABLE; 54d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return true; 55d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 56d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 57a4099a3bb81adafc5593090c1185ec82933a3d6eyusukes@chromium.org hdmx->pad_len = hdmx->size_device_record - actual_size_device_record; 58d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org if (hdmx->pad_len > 3) { 59d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return OTS_FAILURE(); 60d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 61d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 62d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org uint8_t last_pixel_size = 0; 63d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org hdmx->records.reserve(num_recs); 64d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org for (int i = 0; i < num_recs; ++i) { 65d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org OpenTypeHDMXDeviceRecord rec; 66d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 67d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org if (!table.ReadU8(&rec.pixel_size) || 68d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org !table.ReadU8(&rec.max_width)) { 69d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return OTS_FAILURE(); 70d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 71d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org if ((i != 0) && 72d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org (rec.pixel_size <= last_pixel_size)) { 73d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org OTS_WARNING("records are not sorted"); 74d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org DROP_THIS_TABLE; 75d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return true; 76d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 77d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org last_pixel_size = rec.pixel_size; 78d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 79d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org rec.widths.reserve(file->maxp->num_glyphs); 80d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org for (unsigned j = 0; j < file->maxp->num_glyphs; ++j) { 81d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org uint8_t width; 82d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org if (!table.ReadU8(&width)) { 83d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return OTS_FAILURE(); 84d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 85d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org rec.widths.push_back(width); 86d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 87d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 88d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org if ((hdmx->pad_len > 0) && 89d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org !table.Skip(hdmx->pad_len)) { 90d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return OTS_FAILURE(); 91d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 92d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 93d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org hdmx->records.push_back(rec); 94d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 95d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 96d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return true; 97d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org} 98d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 99d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.orgbool ots_hdmx_should_serialise(OpenTypeFile *file) { 100d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org if (!file->hdmx) return false; 101d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org if (!file->glyf) return false; // this table is not for CFF fonts. 102d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return true; 103d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org} 104d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 105d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.orgbool ots_hdmx_serialise(OTSStream *out, OpenTypeFile *file) { 106d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org OpenTypeHDMX * const hdmx = file->hdmx; 107d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 108d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org if (!out->WriteU16(hdmx->version) || 109d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org !out->WriteS16(hdmx->records.size()) || 110d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org !out->WriteS32(hdmx->size_device_record)) { 111d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return OTS_FAILURE(); 112d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 113d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 114d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org for (unsigned i = 0; i < hdmx->records.size(); ++i) { 115d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org const OpenTypeHDMXDeviceRecord& rec = hdmx->records[i]; 116d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org if (!out->Write(&rec.pixel_size, 1) || 117d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org !out->Write(&rec.max_width, 1) || 118d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org !out->Write(&rec.widths[0], rec.widths.size())) { 119d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return OTS_FAILURE(); 120d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 121d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org if ((hdmx->pad_len > 0) && 122d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org !out->Write((const uint8_t *)"\x00\x00\x00", hdmx->pad_len)) { 123d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return OTS_FAILURE(); 124d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 125d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 126d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 127d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return true; 128d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org} 129d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 130d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.orgvoid ots_hdmx_free(OpenTypeFile *file) { 131d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org delete file->hdmx; 132d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org} 133d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 134d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org} // namespace ots 135