From 6bf0a5cb5034a7e684dcc3500e841785237ce2dd Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 19:32:43 +0200 Subject: Adding upstream version 1:115.7.0. Signed-off-by: Daniel Baumann --- gfx/ots/src/cpal.cc | 285 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 285 insertions(+) create mode 100644 gfx/ots/src/cpal.cc (limited to 'gfx/ots/src/cpal.cc') diff --git a/gfx/ots/src/cpal.cc b/gfx/ots/src/cpal.cc new file mode 100644 index 0000000000..b20088900c --- /dev/null +++ b/gfx/ots/src/cpal.cc @@ -0,0 +1,285 @@ +// Copyright (c) 2022 The OTS 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 "cpal.h" +#include "name.h" + +// CPAL - Color Palette Table +// http://www.microsoft.com/typography/otspec/cpal.htm + +#define TABLE_NAME "CPAL" + +namespace { + +// Caller has sized the colorRecords array, so we know how much to try and read. +bool ParseColorRecordsArray(const ots::Font* font, + const uint8_t* data, size_t length, + std::vector* colorRecords) +{ + ots::Buffer subtable(data, length); + + for (auto& color : *colorRecords) { + if (!subtable.ReadU32(&color)) { + return OTS_FAILURE_MSG("Failed to read color record"); + } + } + + return true; +} + +// Caller has sized the paletteTypes array, so we know how much to try and read. +bool ParsePaletteTypesArray(const ots::Font* font, + const uint8_t* data, size_t length, + std::vector* paletteTypes) +{ + ots::Buffer subtable(data, length); + + constexpr uint32_t USABLE_WITH_LIGHT_BACKGROUND = 0x0001; + constexpr uint32_t USABLE_WITH_DARK_BACKGROUND = 0x0002; + constexpr uint32_t RESERVED = ~(USABLE_WITH_LIGHT_BACKGROUND | USABLE_WITH_DARK_BACKGROUND); + + for (auto& type : *paletteTypes) { + if (!subtable.ReadU32(&type)) { + return OTS_FAILURE_MSG("Failed to read palette type"); + } + if (type & RESERVED) { + // Should we treat this as failure? For now, just a warning; seems unlikely + // to be dangerous. + OTS_WARNING("Invalid (reserved) palette type flags %08x", type); + type &= ~RESERVED; + } + } + + return true; +} + +// Caller has sized the labels array, so we know how much to try and read. +bool ParseLabelsArray(const ots::Font* font, + const uint8_t* data, size_t length, + std::vector* labels, + const char* labelType) +{ + ots::Buffer subtable(data, length); + + auto* name = static_cast(font->GetTypedTable(OTS_TAG_NAME)); + if (!name) { + return OTS_FAILURE_MSG("Required name table missing"); + } + + for (auto& nameID : *labels) { + if (!subtable.ReadU16(&nameID)) { + return OTS_FAILURE_MSG("Failed to read %s label ID", labelType); + } + if (nameID != 0xffff) { + if (!name->IsValidNameId(nameID)) { + OTS_WARNING("Label ID %u for %s missing from name table", nameID, labelType); + nameID = 0xffff; + } + } + } + + return true; +} + +} // namespace + +namespace ots { + +bool OpenTypeCPAL::Parse(const uint8_t *data, size_t length) { + Font *font = GetFont(); + Buffer table(data, length); + + // Header fields common to versions 0 and 1. These are recomputed + // from the array sizes during serialization. + uint16_t numPalettes; + uint16_t numColorRecords; + uint32_t colorRecordsArrayOffset; + + if (!table.ReadU16(&this->version) || + !table.ReadU16(&this->num_palette_entries) || + !table.ReadU16(&numPalettes) || + !table.ReadU16(&numColorRecords) || + !table.ReadU32(&colorRecordsArrayOffset)) { + return Error("Failed to read CPAL table header"); + } + + if (this->version > 1) { + return Error("Unknown CPAL table version %u", this->version); + } + + if (!this->num_palette_entries || !numPalettes || !numColorRecords) { + return Error("Empty CPAL is not valid"); + } + + if (this->num_palette_entries > numColorRecords) { + return Error("Not enough color records for a complete palette"); + } + + uint32_t headerSize = 4 * sizeof(uint16_t) + sizeof(uint32_t) + + numPalettes * sizeof(uint16_t); + + // uint16_t colorRecordIndices[numPalettes] + this->colorRecordIndices.resize(numPalettes); + for (auto& colorRecordIndex : this->colorRecordIndices) { + if (!table.ReadU16(&colorRecordIndex)) { + return Error("Failed to read color record index"); + } + if (colorRecordIndex > numColorRecords - this->num_palette_entries) { + return Error("Palette overflows color records array"); + } + } + + uint32_t paletteTypesArrayOffset = 0; + uint32_t paletteLabelsArrayOffset = 0; + uint32_t paletteEntryLabelsArrayOffset = 0; + if (this->version == 1) { + if (!table.ReadU32(&paletteTypesArrayOffset) || + !table.ReadU32(&paletteLabelsArrayOffset) || + !table.ReadU32(&paletteEntryLabelsArrayOffset)) { + return Error("Failed to read CPAL v.1 table header"); + } + headerSize += 3 * sizeof(uint32_t); + } + + // The following arrays may occur in any order, as they're independently referenced + // by offsets in the header. + + if (colorRecordsArrayOffset < headerSize || colorRecordsArrayOffset >= length) { + return Error("Bad color records array offset in table header"); + } + this->colorRecords.resize(numColorRecords); + if (!ParseColorRecordsArray(font, data + colorRecordsArrayOffset, length - colorRecordsArrayOffset, + &this->colorRecords)) { + return Error("Failed to parse color records array"); + } + + if (paletteTypesArrayOffset) { + if (paletteTypesArrayOffset < headerSize || paletteTypesArrayOffset >= length) { + return Error("Bad palette types array offset in table header"); + } + this->paletteTypes.resize(numPalettes); + if (!ParsePaletteTypesArray(font, data + paletteTypesArrayOffset, length - paletteTypesArrayOffset, + &this->paletteTypes)) { + return Error("Failed to parse palette types array"); + } + } + + if (paletteLabelsArrayOffset) { + if (paletteLabelsArrayOffset < headerSize || paletteLabelsArrayOffset >= length) { + return Error("Bad palette labels array offset in table header"); + } + this->paletteLabels.resize(numPalettes); + if (!ParseLabelsArray(font, data + paletteLabelsArrayOffset, length - paletteLabelsArrayOffset, + &this->paletteLabels, "palette")) { + return Error("Failed to parse palette labels array"); + } + } + + if (paletteEntryLabelsArrayOffset) { + if (paletteEntryLabelsArrayOffset < headerSize || paletteEntryLabelsArrayOffset >= length) { + return Error("Bad palette entry labels array offset in table header"); + } + this->paletteEntryLabels.resize(this->num_palette_entries); + if (!ParseLabelsArray(font, data + paletteEntryLabelsArrayOffset, length - paletteEntryLabelsArrayOffset, + &this->paletteEntryLabels, "palette entry")) { + return Error("Failed to parse palette entry labels array"); + } + } + + return true; +} + +bool OpenTypeCPAL::Serialize(OTSStream *out) { + uint16_t numPalettes = this->colorRecordIndices.size(); + uint16_t numColorRecords = this->colorRecords.size(); + +#ifndef NDEBUG + off_t start = out->Tell(); +#endif + + size_t colorRecordsArrayOffset = 4 * sizeof(uint16_t) + sizeof(uint32_t) + + numPalettes * sizeof(uint16_t); + if (this->version == 1) { + colorRecordsArrayOffset += 3 * sizeof(uint32_t); + } + + size_t totalLen = colorRecordsArrayOffset + numColorRecords * sizeof(uint32_t); + + if (!out->WriteU16(this->version) || + !out->WriteU16(this->num_palette_entries) || + !out->WriteU16(numPalettes) || + !out->WriteU16(numColorRecords) || + !out->WriteU32(colorRecordsArrayOffset)) { + return Error("Failed to write CPAL header"); + } + + for (auto i : this->colorRecordIndices) { + if (!out->WriteU16(i)) { + return Error("Failed to write color record indices"); + } + } + + if (this->version == 1) { + size_t paletteTypesArrayOffset = 0; + if (!this->paletteTypes.empty()) { + assert(paletteTypes.size() == numPalettes); + paletteTypesArrayOffset = totalLen; + totalLen += numPalettes * sizeof(uint32_t); + } + + size_t paletteLabelsArrayOffset = 0; + if (!this->paletteLabels.empty()) { + assert(paletteLabels.size() == numPalettes); + paletteLabelsArrayOffset = totalLen; + totalLen += numPalettes * sizeof(uint16_t); + } + + size_t paletteEntryLabelsArrayOffset = 0; + if (!this->paletteEntryLabels.empty()) { + assert(paletteEntryLabels.size() == this->num_palette_entries); + paletteEntryLabelsArrayOffset = totalLen; + totalLen += this->num_palette_entries * sizeof(uint16_t); + } + + if (!out->WriteU32(paletteTypesArrayOffset) || + !out->WriteU32(paletteLabelsArrayOffset) || + !out->WriteU32(paletteEntryLabelsArrayOffset)) { + return Error("Failed to write CPAL v.1 header"); + } + } + + for (auto i : this->colorRecords) { + if (!out->WriteU32(i)) { + return Error("Failed to write color records"); + } + } + + if (this->version == 1) { + for (auto i : this->paletteTypes) { + if (!out->WriteU32(i)) { + return Error("Failed to write palette types"); + } + } + + for (auto i : this->paletteLabels) { + if (!out->WriteU16(i)) { + return Error("Failed to write palette labels"); + } + } + + for (auto i : this->paletteEntryLabels) { + if (!out->WriteU16(i)) { + return Error("Failed to write palette entry labels"); + } + } + } + + assert(size_t(out->Tell() - start) == totalLen); + + return true; +} + +} // namespace ots + +#undef TABLE_NAME -- cgit v1.2.3