| /* |
| * Copyright 2012 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "include/core/SkData.h" |
| #include "include/core/SkStream.h" |
| #include "src/core/SkFontDescriptor.h" |
| #include "src/core/SkStreamPriv.h" |
| |
| enum { |
| kInvalid = 0x00, |
| |
| // Related to a font request. |
| kFontFamilyName = 0x01, // int length, data[length] |
| kFullName = 0x04, // int length, data[length] |
| kPostscriptName = 0x06, // int length, data[length] |
| kWeight = 0x10, // scalar (1 - 1000) |
| kWidth = 0x11, // scalar (percentage, 100 is 'normal') |
| kSlant = 0x12, // scalar (cw angle, 14 is a normal right leaning oblique) |
| kItalic = 0x13, // scalar (0 is Roman, 1 is fully Italic) |
| |
| // Related to font data. Can also be used with a requested font. |
| kPaletteIndex = 0xF8, // int |
| kPaletteEntryOverrides = 0xF9, // int count, (int, u32)[count] |
| kFontVariation = 0xFA, // int count, (u32, scalar)[count] |
| |
| // Related to font data. |
| kFactoryId = 0xFC, // int |
| kFontIndex = 0xFD, // int |
| kSentinel = 0xFF, // no data |
| }; |
| |
| SkFontDescriptor::SkFontDescriptor() { } |
| |
| static bool SK_WARN_UNUSED_RESULT read_string(SkStream* stream, SkString* string) { |
| size_t length; |
| if (!stream->readPackedUInt(&length)) { return false; } |
| if (length > 0) { |
| if (StreamRemainingLengthIsBelow(stream, length)) { |
| return false; |
| } |
| string->resize(length); |
| if (stream->read(string->data(), length) != length) { return false; } |
| } |
| return true; |
| } |
| |
| static bool write_string(SkWStream* stream, const SkString& string, uint32_t id) { |
| if (string.isEmpty()) { return true; } |
| return stream->writePackedUInt(id) && |
| stream->writePackedUInt(string.size()) && |
| stream->write(string.c_str(), string.size()); |
| } |
| |
| static bool write_uint(SkWStream* stream, size_t n, uint32_t id) { |
| return stream->writePackedUInt(id) && |
| stream->writePackedUInt(n); |
| } |
| |
| static bool write_scalar(SkWStream* stream, SkScalar n, uint32_t id) { |
| return stream->writePackedUInt(id) && |
| stream->writeScalar(n); |
| } |
| |
| static size_t SK_WARN_UNUSED_RESULT read_id(SkStream* stream) { |
| size_t i; |
| if (!stream->readPackedUInt(&i)) { return kInvalid; } |
| return i; |
| } |
| |
| static constexpr SkScalar usWidths[9] { |
| 1, 2, 3, 4, 5, 6, 7, 8, 9 |
| }; |
| static constexpr SkScalar width_for_usWidth[0x10] = { |
| 50, |
| 50, 62.5, 75, 87.5, 100, 112.5, 125, 150, 200, |
| 200, 200, 200, 200, 200, 200 |
| }; |
| |
| bool SkFontDescriptor::Deserialize(SkStream* stream, SkFontDescriptor* result) { |
| size_t factoryId; |
| using FactoryIdType = decltype(result->fFactoryId); |
| |
| size_t coordinateCount; |
| using CoordinateCountType = decltype(result->fCoordinateCount); |
| |
| size_t index; |
| using CollectionIndexType = decltype(result->fCollectionIndex); |
| |
| size_t paletteIndex; |
| using PaletteIndexType = decltype(result->fPaletteIndex); |
| |
| size_t paletteEntryOverrideCount; |
| using PaletteEntryOverrideCountType = decltype(result->fPaletteEntryOverrideCount); |
| |
| size_t paletteEntryOverrideIndex; |
| using PaletteEntryOverrideIndexType = decltype(result->fPaletteEntryOverrides[0].index); |
| |
| SkScalar weight = SkFontStyle::kNormal_Weight; |
| SkScalar width = SkFontStyle::kNormal_Width; |
| SkScalar slant = 0; |
| SkScalar italic = 0; |
| |
| size_t styleBits; |
| if (!stream->readPackedUInt(&styleBits)) { return false; } |
| weight = ((styleBits >> 16) & 0xFFFF); |
| width = ((styleBits >> 8) & 0x000F)[width_for_usWidth]; |
| slant = ((styleBits >> 0) & 0x000F) != SkFontStyle::kUpright_Slant ? 14 : 0; |
| italic = ((styleBits >> 0) & 0x000F) == SkFontStyle::kItalic_Slant ? 1 : 0; |
| |
| for (size_t id; (id = read_id(stream)) != kSentinel;) { |
| switch (id) { |
| case kFontFamilyName: |
| if (!read_string(stream, &result->fFamilyName)) { return false; } |
| break; |
| case kFullName: |
| if (!read_string(stream, &result->fFullName)) { return false; } |
| break; |
| case kPostscriptName: |
| if (!read_string(stream, &result->fPostscriptName)) { return false; } |
| break; |
| case kWeight: |
| if (!stream->readScalar(&weight)) { return false; } |
| break; |
| case kWidth: |
| if (!stream->readScalar(&width)) { return false; } |
| break; |
| case kSlant: |
| if (!stream->readScalar(&slant)) { return false; } |
| break; |
| case kItalic: |
| if (!stream->readScalar(&italic)) { return false; } |
| break; |
| case kFontVariation: |
| if (!stream->readPackedUInt(&coordinateCount)) { return false; } |
| if (!SkTFitsIn<CoordinateCountType>(coordinateCount)) { return false; } |
| if (StreamRemainingLengthIsBelow(stream, coordinateCount)) { |
| return false; |
| } |
| result->fCoordinateCount = SkTo<CoordinateCountType>(coordinateCount); |
| |
| result->fVariation.reset(coordinateCount); |
| for (size_t i = 0; i < coordinateCount; ++i) { |
| if (!stream->readU32(&result->fVariation[i].axis)) { return false; } |
| if (!stream->readScalar(&result->fVariation[i].value)) { return false; } |
| } |
| break; |
| case kFontIndex: |
| if (!stream->readPackedUInt(&index)) { return false; } |
| if (!SkTFitsIn<CollectionIndexType>(index)) { return false; } |
| result->fCollectionIndex = SkTo<CollectionIndexType>(index); |
| break; |
| case kPaletteIndex: |
| if (!stream->readPackedUInt(&paletteIndex)) { return false; } |
| if (!SkTFitsIn<PaletteIndexType>(paletteIndex)) { return false; } |
| result->fPaletteIndex = SkTo<PaletteIndexType>(paletteIndex); |
| break; |
| case kPaletteEntryOverrides: |
| if (!stream->readPackedUInt(&paletteEntryOverrideCount)) { return false; } |
| if (!SkTFitsIn<PaletteEntryOverrideCountType>(paletteEntryOverrideCount)) { |
| return false; |
| } |
| if (StreamRemainingLengthIsBelow(stream, paletteEntryOverrideCount)) { |
| return false; |
| } |
| result->fPaletteEntryOverrideCount = |
| SkTo<PaletteEntryOverrideCountType>(paletteEntryOverrideCount); |
| |
| result->fPaletteEntryOverrides.reset(paletteEntryOverrideCount); |
| for (size_t i = 0; i < paletteEntryOverrideCount; ++i) { |
| if (!stream->readPackedUInt(&paletteEntryOverrideIndex)) { return false; } |
| if (!SkTFitsIn<PaletteEntryOverrideIndexType>(paletteEntryOverrideIndex)) { |
| return false; |
| } |
| result->fPaletteEntryOverrides[i].index = |
| SkTo<PaletteEntryOverrideIndexType>(paletteEntryOverrideIndex); |
| if (!stream->readU32(&result->fPaletteEntryOverrides[i].color)) { |
| return false; |
| } |
| } |
| break; |
| case kFactoryId: |
| if (!stream->readPackedUInt(&factoryId)) { return false; } |
| if (!SkTFitsIn<FactoryIdType>(factoryId)) { return false; } |
| result->fFactoryId = SkTo<FactoryIdType>(factoryId); |
| break; |
| default: |
| SkDEBUGFAIL("Unknown id used by a font descriptor"); |
| return false; |
| } |
| } |
| |
| SkFontStyle::Slant slantEnum = SkFontStyle::kUpright_Slant; |
| if (slant != 0) { slantEnum = SkFontStyle::kOblique_Slant; } |
| if (0 < italic) { slantEnum = SkFontStyle::kItalic_Slant; } |
| SkFontStyle::Width widthEnum = SkFontStyleWidthForWidthAxisValue(width); |
| result->fStyle = SkFontStyle(SkScalarRoundToInt(weight), widthEnum, slantEnum); |
| |
| size_t length; |
| if (!stream->readPackedUInt(&length)) { return false; } |
| if (length > 0) { |
| if (StreamRemainingLengthIsBelow(stream, length)) { |
| return false; |
| } |
| sk_sp<SkData> data(SkData::MakeUninitialized(length)); |
| if (stream->read(data->writable_data(), length) != length) { |
| SkDEBUGFAIL("Could not read font data"); |
| return false; |
| } |
| result->fStream = SkMemoryStream::Make(std::move(data)); |
| } |
| return true; |
| } |
| |
| void SkFontDescriptor::serialize(SkWStream* stream) const { |
| uint32_t styleBits = (fStyle.weight() << 16) | (fStyle.width() << 8) | (fStyle.slant()); |
| stream->writePackedUInt(styleBits); |
| |
| write_string(stream, fFamilyName, kFontFamilyName); |
| write_string(stream, fFullName, kFullName); |
| write_string(stream, fPostscriptName, kPostscriptName); |
| |
| write_scalar(stream, fStyle.weight(), kWeight); |
| write_scalar(stream, fStyle.width()[width_for_usWidth], kWidth); |
| write_scalar(stream, fStyle.slant() == SkFontStyle::kUpright_Slant ? 0 : 14, kSlant); |
| write_scalar(stream, fStyle.slant() == SkFontStyle::kItalic_Slant ? 1 : 0, kItalic); |
| |
| if (fCollectionIndex > 0) { |
| write_uint(stream, fCollectionIndex, kFontIndex); |
| } |
| if (fPaletteIndex > 0) { |
| write_uint(stream, fPaletteIndex, kPaletteIndex); |
| } |
| if (fCoordinateCount > 0) { |
| write_uint(stream, fCoordinateCount, kFontVariation); |
| for (int i = 0; i < fCoordinateCount; ++i) { |
| stream->write32(fVariation[i].axis); |
| stream->writeScalar(fVariation[i].value); |
| } |
| } |
| if (fPaletteEntryOverrideCount > 0) { |
| int nonNegativePaletteOverrideIndexes = 0; |
| for (int i = 0; i < fPaletteEntryOverrideCount; ++i) { |
| if (0 <= fPaletteEntryOverrides[i].index) { |
| ++nonNegativePaletteOverrideIndexes; |
| } |
| } |
| write_uint(stream, nonNegativePaletteOverrideIndexes, kPaletteEntryOverrides); |
| for (int i = 0; i < fPaletteEntryOverrideCount; ++i) { |
| if (0 <= fPaletteEntryOverrides[i].index) { |
| stream->writePackedUInt(fPaletteEntryOverrides[i].index); |
| stream->write32(fPaletteEntryOverrides[i].color); |
| } |
| } |
| } |
| |
| write_uint(stream, fFactoryId, kFactoryId); |
| |
| stream->writePackedUInt(kSentinel); |
| |
| if (fStream) { |
| std::unique_ptr<SkStreamAsset> fontStream = fStream->duplicate(); |
| size_t length = fontStream->getLength(); |
| stream->writePackedUInt(length); |
| stream->writeStream(fontStream.get(), length); |
| } else { |
| stream->writePackedUInt(0); |
| } |
| } |
| |
| SkFontStyle::Width SkFontDescriptor::SkFontStyleWidthForWidthAxisValue(SkScalar width) { |
| int usWidth = SkScalarRoundToInt(SkScalarInterpFunc(width, &width_for_usWidth[1], usWidths, 9)); |
| return static_cast<SkFontStyle::Width>(usWidth); |
| } |