michael@0: // Copyright (c) 2009 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #include "maxp.h"
michael@0: 
michael@0: // maxp - Maximum Profile
michael@0: // http://www.microsoft.com/typography/otspec/maxp.htm
michael@0: 
michael@0: #define TABLE_NAME "maxp"
michael@0: 
michael@0: namespace ots {
michael@0: 
michael@0: bool ots_maxp_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
michael@0:   Buffer table(data, length);
michael@0: 
michael@0:   OpenTypeMAXP *maxp = new OpenTypeMAXP;
michael@0:   file->maxp = maxp;
michael@0: 
michael@0:   uint32_t version = 0;
michael@0:   if (!table.ReadU32(&version)) {
michael@0:     return OTS_FAILURE_MSG("Failed to read version of maxp table");
michael@0:   }
michael@0: 
michael@0:   if (version >> 16 > 1) {
michael@0:     return OTS_FAILURE_MSG("Bad maxp version %d", version);
michael@0:   }
michael@0: 
michael@0:   if (!table.ReadU16(&maxp->num_glyphs)) {
michael@0:     return OTS_FAILURE_MSG("Failed to read number of glyphs from maxp table");
michael@0:   }
michael@0: 
michael@0:   if (!maxp->num_glyphs) {
michael@0:     return OTS_FAILURE_MSG("Bad number of glyphs 0 in maxp table");
michael@0:   }
michael@0: 
michael@0:   if (version >> 16 == 1) {
michael@0:     maxp->version_1 = true;
michael@0:     if (!table.ReadU16(&maxp->max_points) ||
michael@0:         !table.ReadU16(&maxp->max_contours) ||
michael@0:         !table.ReadU16(&maxp->max_c_points) ||
michael@0:         !table.ReadU16(&maxp->max_c_contours) ||
michael@0:         !table.ReadU16(&maxp->max_zones) ||
michael@0:         !table.ReadU16(&maxp->max_t_points) ||
michael@0:         !table.ReadU16(&maxp->max_storage) ||
michael@0:         !table.ReadU16(&maxp->max_fdefs) ||
michael@0:         !table.ReadU16(&maxp->max_idefs) ||
michael@0:         !table.ReadU16(&maxp->max_stack) ||
michael@0:         !table.ReadU16(&maxp->max_size_glyf_instructions) ||
michael@0:         !table.ReadU16(&maxp->max_c_components) ||
michael@0:         !table.ReadU16(&maxp->max_c_depth)) {
michael@0:       return OTS_FAILURE_MSG("Failed to read maxp table");
michael@0:     }
michael@0: 
michael@0:     if (maxp->max_zones == 0) {
michael@0:       // workaround for ipa*.ttf Japanese fonts.
michael@0:       OTS_WARNING("bad max_zones: %u", maxp->max_zones);
michael@0:       maxp->max_zones = 1;
michael@0:     } else if (maxp->max_zones == 3) {
michael@0:       // workaround for Ecolier-*.ttf fonts.
michael@0:       OTS_WARNING("bad max_zones: %u", maxp->max_zones);
michael@0:       maxp->max_zones = 2;
michael@0:     }
michael@0: 
michael@0:     if ((maxp->max_zones != 1) && (maxp->max_zones != 2)) {
michael@0:       return OTS_FAILURE_MSG("Bad max zones %d in maxp", maxp->max_zones);
michael@0:     }
michael@0:   } else {
michael@0:     maxp->version_1 = false;
michael@0:   }
michael@0: 
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: bool ots_maxp_should_serialise(OpenTypeFile *file) {
michael@0:   return file->maxp != NULL;
michael@0: }
michael@0: 
michael@0: bool ots_maxp_serialise(OTSStream *out, OpenTypeFile *file) {
michael@0:   const OpenTypeMAXP *maxp = file->maxp;
michael@0: 
michael@0:   if (!out->WriteU32(maxp->version_1 ? 0x00010000 : 0x00005000) ||
michael@0:       !out->WriteU16(maxp->num_glyphs)) {
michael@0:     return OTS_FAILURE_MSG("Failed to write maxp version or number of glyphs");
michael@0:   }
michael@0: 
michael@0:   if (!maxp->version_1) return true;
michael@0: 
michael@0:   if (!out->WriteU16(maxp->max_points) ||
michael@0:       !out->WriteU16(maxp->max_contours) ||
michael@0:       !out->WriteU16(maxp->max_c_points) ||
michael@0:       !out->WriteU16(maxp->max_c_contours)) {
michael@0:     return OTS_FAILURE_MSG("Failed to write maxp");
michael@0:   }
michael@0: 
michael@0:   if (g_transcode_hints) {
michael@0:     if (!out->WriteU16(maxp->max_zones) ||
michael@0:         !out->WriteU16(maxp->max_t_points) ||
michael@0:         !out->WriteU16(maxp->max_storage) ||
michael@0:         !out->WriteU16(maxp->max_fdefs) ||
michael@0:         !out->WriteU16(maxp->max_idefs) ||
michael@0:         !out->WriteU16(maxp->max_stack) ||
michael@0:         !out->WriteU16(maxp->max_size_glyf_instructions)) {
michael@0:       return OTS_FAILURE_MSG("Failed to write more maxp");
michael@0:     }
michael@0:   } else {
michael@0:     if (!out->WriteU16(1) ||  // max zones
michael@0:         !out->WriteU16(0) ||  // max twilight points
michael@0:         !out->WriteU16(0) ||  // max storage
michael@0:         !out->WriteU16(0) ||  // max function defs
michael@0:         !out->WriteU16(0) ||  // max instruction defs
michael@0:         !out->WriteU16(0) ||  // max stack elements
michael@0:         !out->WriteU16(0)) {  // max instruction byte count
michael@0:       return OTS_FAILURE_MSG("Failed to write more maxp");
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   if (!out->WriteU16(maxp->max_c_components) ||
michael@0:       !out->WriteU16(maxp->max_c_depth)) {
michael@0:     return OTS_FAILURE_MSG("Failed to write yet more maxp");
michael@0:   }
michael@0: 
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: void ots_maxp_free(OpenTypeFile *file) {
michael@0:   delete file->maxp;
michael@0: }
michael@0: 
michael@0: }  // namespace ots