blob: 7c82e19918c0ee8591f989d387f379b6afcdebe8 [file] [log] [blame]
/*
* 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);
}