/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkAutoMalloc.h"
#include "SkColorSpace_Base.h"
#include "SkColorSpace_XYZ.h"
#include "SkColorSpacePriv.h"
#include "SkColorSpaceXformPriv.h"
#include "SkEndian.h"
#include "SkFixed.h"
#include "SkICC.h"
#include "SkICCPriv.h"
SkICC::SkICC(sk_sp<SkColorSpace> colorSpace)
: fColorSpace(std::move(colorSpace))
{}
sk_sp<SkICC> SkICC::Make(const void* ptr, size_t len) {
sk_sp<SkColorSpace> colorSpace = SkColorSpace::MakeICC(ptr, len);
if (!colorSpace) {
return nullptr;
}
return sk_sp<SkICC>(new SkICC(std::move(colorSpace)));
}
bool SkICC::toXYZD50(SkMatrix44* toXYZD50) const {
const SkMatrix44* m = as_CSB(fColorSpace)->toXYZD50();
if (!m) {
return false;
}
*toXYZD50 = *m;
return true;
}
bool SkICC::isNumericalTransferFn(SkColorSpaceTransferFn* coeffs) const {
return as_CSB(fColorSpace)->onIsNumericalTransferFn(coeffs);
}
static const int kDefaultTableSize = 512; // Arbitrary
void fn_to_table(float* tablePtr, const SkColorSpaceTransferFn& fn) {
// Y = (aX + b)^g + e for X >= d
// Y = cX + f otherwise
for (int i = 0; i < kDefaultTableSize; i++) {
float x = ((float) i) / ((float) (kDefaultTableSize - 1));
if (x >= fn.fD) {
tablePtr[i] = clamp_0_1(powf(fn.fA * x + fn.fB, fn.fG) + fn.fE);
} else {
tablePtr[i] = clamp_0_1(fn.fC * x + fn.fF);
}
}
}
void copy_to_table(float* tablePtr, const SkGammas* gammas, int index) {
SkASSERT(gammas->isTable(index));
const float* ptr = gammas->table(index);
const size_t bytes = gammas->tableSize(index) * sizeof(float);
memcpy(tablePtr, ptr, bytes);
}
bool SkICC::rawTransferFnData(Tables* tables) const {
if (SkColorSpace_Base::Type::kA2B == as_CSB(fColorSpace)->type()) {
return false;
}
SkColorSpace_XYZ* colorSpace = (SkColorSpace_XYZ*) fColorSpace.get();
SkColorSpaceTransferFn fn;
if (this->isNumericalTransferFn(&fn)) {
tables->fStorage = SkData::MakeUninitialized(kDefaultTableSize * sizeof(float));
fn_to_table((float*) tables->fStorage->writable_data(), fn);
tables->fRed.fOffset = tables->fGreen.fOffset = tables->fBlue.fOffset = 0;
tables->fRed.fCount = tables->fGreen.fCount = tables->fBlue.fCount = kDefaultTableSize;
return true;
}
const SkGammas* gammas = colorSpace->gammas();
SkASSERT(gammas);
if (gammas->data(0) == gammas->data(1) && gammas->data(0) == gammas->data(2)) {
SkASSERT(gammas->isTable(0));
tables->fStorage = SkData::MakeUninitialized(gammas->tableSize(0) * sizeof(float));
copy_to_table((float*) tables->fStorage->writable_data(), gammas, 0);
tables->fRed.fOffset = tables->fGreen.fOffset = tables->fBlue.fOffset = 0;
tables->fRed.fCount = tables->fGreen.fCount = tables->fBlue.fCount = gammas->tableSize(0);
return true;
}
// Determine the storage size.
size_t storageSize = 0;
for (int i = 0; i < 3; i++) {
if (gammas->isTable(i)) {
storageSize += gammas->tableSize(i) * sizeof(float);
} else {
storageSize += kDefaultTableSize * sizeof(float);
}
}
// Fill in the tables.
tables->fStorage = SkData::MakeUninitialized(storageSize);
float* ptr = (float*) tables->fStorage->writable_data();
size_t offset = 0;
Channel rgb[3];
for (int i = 0; i < 3; i++) {
if (gammas->isTable(i)) {
copy_to_table(ptr, gammas, i);
rgb[i].fOffset = offset;
rgb[i].fCount = gammas->tableSize(i);
offset += rgb[i].fCount * sizeof(float);
ptr += rgb[i].fCount;
continue;
}
if (gammas->isNamed(i)) {
SkAssertResult(named_to_parametric(&fn, gammas->data(i).fNamed));
} else if (gammas->isValue(i)) {
value_to_parametric(&fn, gammas->data(i).fValue);
} else {
SkASSERT(gammas->isParametric(i));
fn = gammas->params(i);
}
fn_to_table(ptr, fn);
rgb[i].fOffset = offset;
rgb[i].fCount = kDefaultTableSize;
offset += kDefaultTableSize * sizeof(float);
ptr += kDefaultTableSize;
}
tables->fRed = rgb[0];
tables->fGreen = rgb[1];
tables->fBlue = rgb[2];
return true;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
// Google Skia (UTF-16)
static constexpr uint8_t kDescriptionTagBody[] = {
0x00, 0x47, 0x00, 0x6f, 0x00, 0x6f, 0x00, 0x67, 0x00, 0x6c, 0x00, 0x65, 0x00, 0x20, 0x00,
0x53, 0x00, 0x6b, 0x00, 0x69, 0x00, 0x61, 0x00, 0x20,
};
static_assert(SkIsAlign4(sizeof(kDescriptionTagBody)), "Description must be aligned to 4-bytes.");
static constexpr uint32_t kDescriptionTagHeader[7] {
SkEndian_SwapBE32(kTAG_TextType), // Type signature
0, // Reserved
SkEndian_SwapBE32(1), // Number of records
SkEndian_SwapBE32(12), // Record size (must be 12)
SkEndian_SwapBE32(SkSetFourByteTag('e', 'n', 'U', 'S')), // English USA
SkEndian_SwapBE32(sizeof(kDescriptionTagBody)), // Length of string
SkEndian_SwapBE32(28), // Offset of string
};
static constexpr uint32_t kWhitePointTag[5] {
SkEndian_SwapBE32(kXYZ_PCSSpace),
0,
SkEndian_SwapBE32(0x0000f6d6), // X = 0.96420 (D50)
SkEndian_SwapBE32(0x00010000), // Y = 1.00000 (D50)
SkEndian_SwapBE32(0x0000d32d), // Z = 0.82491 (D50)
};
// Google Inc. 2016 (UTF-16)
static constexpr uint8_t kCopyrightTagBody[] = {
0x00, 0x47, 0x00, 0x6f, 0x00, 0x6f, 0x00, 0x67, 0x00, 0x6c, 0x00, 0x65, 0x00, 0x20, 0x00,
0x49, 0x00, 0x6e, 0x00, 0x63, 0x00, 0x2e, 0x00, 0x20, 0x00, 0x32, 0x00, 0x30, 0x00, 0x31,
0x00, 0x36,
};
static_assert(SkIsAlign4(sizeof(kCopyrightTagBody)), "Copyright must be aligned to 4-bytes.");
static constexpr uint32_t kCopyrightTagHeader[7] {
SkEndian_SwapBE32(kTAG_TextType), // Type signature
0, // Reserved
SkEndian_SwapBE32(1), // Number of records
SkEndian_SwapBE32(12), // Record size (must be 12)
SkEndian_SwapBE32(SkSetFourByteTag('e', 'n', 'U', 'S')), // English USA
SkEndian_SwapBE32(sizeof(kCopyrightTagBody)), // Length of string
SkEndian_SwapBE32(28), // Offset of string
};
// We will write a profile with the minimum nine required tags.
static constexpr uint32_t kICCNumEntries = 9;
static constexpr uint32_t kTAG_desc = SkSetFourByteTag('d', 'e', 's', 'c');
static constexpr uint32_t kTAG_desc_Bytes = sizeof(kDescriptionTagHeader) +
sizeof(kDescriptionTagBody);
static constexpr uint32_t kTAG_desc_Offset = kICCHeaderSize +
kICCNumEntries * kICCTagTableEntrySize;
static constexpr uint32_t kTAG_XYZ_Bytes = 20;
static constexpr uint32_t kTAG_rXYZ_Offset = kTAG_desc_Offset + kTAG_desc_Bytes;
static constexpr uint32_t kTAG_gXYZ_Offset = kTAG_rXYZ_Offset + kTAG_XYZ_Bytes;
static constexpr uint32_t kTAG_bXYZ_Offset = kTAG_gXYZ_Offset + kTAG_XYZ_Bytes;
static constexpr uint32_t kTAG_TRC_Bytes = 40;
static constexpr uint32_t kTAG_rTRC_Offset = kTAG_bXYZ_Offset + kTAG_XYZ_Bytes;
static constexpr uint32_t kTAG_gTRC_Offset = kTAG_rTRC_Offset;
static constexpr uint32_t kTAG_bTRC_Offset = kTAG_rTRC_Offset;
static constexpr uint32_t kTAG_wtpt = SkSetFourByteTag('w', 't', 'p', 't');
static constexpr uint32_t kTAG_wtpt_Offset = kTAG_bTRC_Offset + kTAG_TRC_Bytes;
static constexpr uint32_t kTAG_cprt = SkSetFourByteTag('c', 'p', 'r', 't');
static constexpr uint32_t kTAG_cprt_Bytes = sizeof(kCopyrightTagHeader) +
sizeof(kCopyrightTagBody);
static constexpr uint32_t kTAG_cprt_Offset = kTAG_wtpt_Offset + kTAG_XYZ_Bytes;
static constexpr uint32_t kICCProfileSize = kTAG_cprt_Offset + kTAG_cprt_Bytes;
static constexpr uint32_t kICCHeader[kICCHeaderSize / 4] {
SkEndian_SwapBE32(kICCProfileSize), // Size of the profile
0, // Preferred CMM type (ignored)
SkEndian_SwapBE32(0x02100000), // Version 2.1
SkEndian_SwapBE32(kDisplay_Profile), // Display device profile
SkEndian_SwapBE32(kRGB_ColorSpace), // RGB input color space
SkEndian_SwapBE32(kXYZ_PCSSpace), // XYZ profile connection space
0, 0, 0, // Date and time (ignored)
SkEndian_SwapBE32(kACSP_Signature), // Profile signature
0, // Platform target (ignored)
0x00000000, // Flags: not embedded, can be used independently
0, // Device manufacturer (ignored)
0, // Device model (ignored)
0, 0, // Device attributes (ignored)
SkEndian_SwapBE32(1), // Relative colorimetric rendering intent
SkEndian_SwapBE32(0x0000f6d6), // D50 standard illuminant (X)
SkEndian_SwapBE32(0x00010000), // D50 standard illuminant (Y)
SkEndian_SwapBE32(0x0000d32d), // D50 standard illuminant (Z)
0, // Profile creator (ignored)
0, 0, 0, 0, // Profile id checksum (ignored)
0, 0, 0, 0, 0, 0, 0, // Reserved (ignored)
SkEndian_SwapBE32(kICCNumEntries), // Number of tags
};
static constexpr uint32_t kICCTagTable[3 * kICCNumEntries] {
// Profile description
SkEndian_SwapBE32(kTAG_desc),
SkEndian_SwapBE32(kTAG_desc_Offset),
SkEndian_SwapBE32(kTAG_desc_Bytes),
// rXYZ
SkEndian_SwapBE32(kTAG_rXYZ),
SkEndian_SwapBE32(kTAG_rXYZ_Offset),
SkEndian_SwapBE32(kTAG_XYZ_Bytes),
// gXYZ
SkEndian_SwapBE32(kTAG_gXYZ),
SkEndian_SwapBE32(kTAG_gXYZ_Offset),
SkEndian_SwapBE32(kTAG_XYZ_Bytes),
// bXYZ
SkEndian_SwapBE32(kTAG_bXYZ),
SkEndian_SwapBE32(kTAG_bXYZ_Offset),
SkEndian_SwapBE32(kTAG_XYZ_Bytes),
// rTRC
SkEndian_SwapBE32(kTAG_rTRC),
SkEndian_SwapBE32(kTAG_rTRC_Offset),
SkEndian_SwapBE32(kTAG_TRC_Bytes),
// gTRC
SkEndian_SwapBE32(kTAG_gTRC),
SkEndian_SwapBE32(kTAG_gTRC_Offset),
SkEndian_SwapBE32(kTAG_TRC_Bytes),
// bTRC
SkEndian_SwapBE32(kTAG_bTRC),
SkEndian_SwapBE32(kTAG_bTRC_Offset),
SkEndian_SwapBE32(kTAG_TRC_Bytes),
// White point
SkEndian_SwapBE32(kTAG_wtpt),
SkEndian_SwapBE32(kTAG_wtpt_Offset),
SkEndian_SwapBE32(kTAG_XYZ_Bytes),
// Copyright
SkEndian_SwapBE32(kTAG_cprt),
SkEndian_SwapBE32(kTAG_cprt_Offset),
SkEndian_SwapBE32(kTAG_cprt_Bytes),
};
static void write_xyz_tag(uint32_t* ptr, const SkMatrix44& toXYZ, int col) {
ptr[0] = SkEndian_SwapBE32(kXYZ_PCSSpace);
ptr[1] = 0;
ptr[2] = SkEndian_SwapBE32(SkFloatToFixed(toXYZ.getFloat(0, col)));
ptr[3] = SkEndian_SwapBE32(SkFloatToFixed(toXYZ.getFloat(1, col)));
ptr[4] = SkEndian_SwapBE32(SkFloatToFixed(toXYZ.getFloat(2, col)));
}
static void write_trc_tag(uint32_t* ptr, const SkColorSpaceTransferFn& fn) {
ptr[0] = SkEndian_SwapBE32(kTAG_ParaCurveType);
ptr[1] = 0;
ptr[2] = (uint32_t) (SkEndian_SwapBE16(kGABCDEF_ParaCurveType));
ptr[3] = SkEndian_SwapBE32(SkFloatToFixed(fn.fG));
ptr[4] = SkEndian_SwapBE32(SkFloatToFixed(fn.fA));
ptr[5] = SkEndian_SwapBE32(SkFloatToFixed(fn.fB));
ptr[6] = SkEndian_SwapBE32(SkFloatToFixed(fn.fC));
ptr[7] = SkEndian_SwapBE32(SkFloatToFixed(fn.fD));
ptr[8] = SkEndian_SwapBE32(SkFloatToFixed(fn.fE));
ptr[9] = SkEndian_SwapBE32(SkFloatToFixed(fn.fF));
}
static bool is_3x3(const SkMatrix44& toXYZD50) {
return 0.0f == toXYZD50.get(3, 0) && 0.0f == toXYZD50.get(3, 1) && 0.0f == toXYZD50.get(3, 2) &&
0.0f == toXYZD50.get(0, 3) && 0.0f == toXYZD50.get(1, 3) && 0.0f == toXYZD50.get(2, 3) &&
1.0f == toXYZD50.get(3, 3);
}
sk_sp<SkData> SkICC::WriteToICC(const SkColorSpaceTransferFn& fn, const SkMatrix44& toXYZD50) {
if (!is_3x3(toXYZD50) || !is_valid_transfer_fn(fn)) {
return nullptr;
}
SkAutoMalloc profile(kICCProfileSize);
uint8_t* ptr = (uint8_t*) profile.get();
// Write profile header
memcpy(ptr, kICCHeader, sizeof(kICCHeader));
ptr += sizeof(kICCHeader);
// Write tag table
memcpy(ptr, kICCTagTable, sizeof(kICCTagTable));
ptr += sizeof(kICCTagTable);
// Write profile description tag
memcpy(ptr, kDescriptionTagHeader, sizeof(kDescriptionTagHeader));
ptr += sizeof(kDescriptionTagHeader);
memcpy(ptr, kDescriptionTagBody, sizeof(kDescriptionTagBody));
ptr += sizeof(kDescriptionTagBody);
// Write XYZ tags
write_xyz_tag((uint32_t*) ptr, toXYZD50, 0);
ptr += kTAG_XYZ_Bytes;
write_xyz_tag((uint32_t*) ptr, toXYZD50, 1);
ptr += kTAG_XYZ_Bytes;
write_xyz_tag((uint32_t*) ptr, toXYZD50, 2);
ptr += kTAG_XYZ_Bytes;
// Write TRC tag
write_trc_tag((uint32_t*) ptr, fn);
ptr += kTAG_TRC_Bytes;
// Write white point tag (must be D50)
memcpy(ptr, kWhitePointTag, sizeof(kWhitePointTag));
ptr += sizeof(kWhitePointTag);
// Write copyright tag
memcpy(ptr, kCopyrightTagHeader, sizeof(kCopyrightTagHeader));
ptr += sizeof(kCopyrightTagHeader);
memcpy(ptr, kCopyrightTagBody, sizeof(kCopyrightTagBody));
ptr += sizeof(kCopyrightTagBody);
SkASSERT(kICCProfileSize == ptr - (uint8_t*) profile.get());
return SkData::MakeFromMalloc(profile.release(), kICCProfileSize);
}