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cobalt / cobalt / ac9ac065c5083565917b15e7a672a79599f2f00b / . / src / third_party / skia / src / core / SkColorSpace_ICC.cpp
blob: 5a510903c681d4cc9afb3fbf2b9de9e18df30569 [file] [log] [blame]
/*
* 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.h"
#include "SkColorSpacePriv.h"
#include "SkColorSpace_A2B.h"
#include "SkColorSpace_Base.h"
#include "SkColorSpace_XYZ.h"
#include "SkEndian.h"
#include "SkFixed.h"
#include "SkICCPriv.h"
#include "SkTemplates.h"
#define return_if_false(pred, msg) \
do { \
if (!(pred)) { \
SkColorSpacePrintf("Invalid ICC Profile: %s.\n", (msg)); \
return false; \
} \
} while (0)
#define return_null(msg) \
do { \
SkColorSpacePrintf("Invalid ICC Profile: %s.\n", (msg)); \
return nullptr; \
} while (0)
static uint16_t read_big_endian_u16(const uint8_t* ptr) {
return ptr[0] << 8 | ptr[1];
}
static uint32_t read_big_endian_u32(const uint8_t* ptr) {
return ptr[0] << 24 | ptr[1] << 16 | ptr[2] << 8 | ptr[3];
}
static int32_t read_big_endian_i32(const uint8_t* ptr) {
return (int32_t) read_big_endian_u32(ptr);
}
static constexpr float kWhitePointD50[] = { 0.96420f, 1.00000f, 0.82491f, };
struct ICCProfileHeader {
uint32_t fSize;
// No reason to care about the preferred color management module (ex: Adobe, Apple, etc.).
// We're always going to use this one.
uint32_t fCMMType_ignored;
uint32_t fVersion;
uint32_t fProfileClass;
uint32_t fInputColorSpace;
uint32_t fPCS;
uint32_t fDateTime_ignored[3];
uint32_t fSignature;
// Indicates the platform that this profile was created for (ex: Apple, Microsoft). This
// doesn't really matter to us.
uint32_t fPlatformTarget_ignored;
// Flags can indicate:
// (1) Whether this profile was embedded in a file. This flag is consistently wrong.
// Ex: The profile came from a file but indicates that it did not.
// (2) Whether we are allowed to use the profile independently of the color data. If set,
// this may allow us to use the embedded profile for testing separate from the original
// image.
uint32_t fFlags_ignored;
// We support many output devices. It doesn't make sense to think about the attributes of
// the device in the context of the image profile.
uint32_t fDeviceManufacturer_ignored;
uint32_t fDeviceModel_ignored;
uint32_t fDeviceAttributes_ignored[2];
uint32_t fRenderingIntent;
int32_t fIlluminantXYZ[3];
// We don't care who created the profile.
uint32_t fCreator_ignored;
// This is an MD5 checksum. Could be useful for checking if profiles are equal.
uint32_t fProfileId_ignored[4];
// Reserved for future use.
uint32_t fReserved_ignored[7];
uint32_t fTagCount;
void init(const uint8_t* src, size_t len) {
SkASSERT(kICCHeaderSize == sizeof(*this));
uint32_t* dst = (uint32_t*) this;
for (uint32_t i = 0; i < kICCHeaderSize / 4; i++, src+=4) {
dst[i] = read_big_endian_u32(src);
}
}
bool valid() const {
return_if_false(fSize >= kICCHeaderSize, "Size is too small");
uint8_t majorVersion = fVersion >> 24;
return_if_false(majorVersion <= 4, "Unsupported version");
// These are the four basic classes of profiles that we might expect to see embedded
// in images. Additional classes exist, but they generally are used as a convenient
// way for CMMs to store calculated transforms.
return_if_false(fProfileClass == kDisplay_Profile ||
fProfileClass == kInput_Profile ||
fProfileClass == kOutput_Profile ||
fProfileClass == kColorSpace_Profile,
"Unsupported profile");
switch (fInputColorSpace) {
case kRGB_ColorSpace:
SkColorSpacePrintf("RGB Input Color Space");
break;
case kCMYK_ColorSpace:
SkColorSpacePrintf("CMYK Input Color Space\n");
break;
case kGray_ColorSpace:
SkColorSpacePrintf("Gray Input Color Space\n");
break;
default:
SkColorSpacePrintf("Unsupported Input Color Space: %c%c%c%c\n",
(fInputColorSpace>>24)&0xFF, (fInputColorSpace>>16)&0xFF,
(fInputColorSpace>> 8)&0xFF, (fInputColorSpace>> 0)&0xFF);
return false;
}
switch (fPCS) {
case kXYZ_PCSSpace:
SkColorSpacePrintf("XYZ PCS\n");
break;
case kLAB_PCSSpace:
SkColorSpacePrintf("Lab PCS\n");
break;
default:
// ICC currently (V4.3) only specifices XYZ and Lab PCS spaces
SkColorSpacePrintf("Unsupported PCS space: %c%c%c%c\n",
(fPCS>>24)&0xFF, (fPCS>>16)&0xFF,
(fPCS>> 8)&0xFF, (fPCS>> 0)&0xFF);
return false;
}
return_if_false(fSignature == kACSP_Signature, "Bad signature");
// TODO (msarett):
// Should we treat different rendering intents differently?
// Valid rendering intents include kPerceptual (0), kRelative (1),
// kSaturation (2), and kAbsolute (3).
if (fRenderingIntent > 3) {
// Warn rather than fail here. Occasionally, we see perfectly
// normal profiles with wacky rendering intents.
SkColorSpacePrintf("Warning, bad rendering intent.\n");
}
return_if_false(
color_space_almost_equal(SkFixedToFloat(fIlluminantXYZ[0]), kWhitePointD50[0]) &&
color_space_almost_equal(SkFixedToFloat(fIlluminantXYZ[1]), kWhitePointD50[1]) &&
color_space_almost_equal(SkFixedToFloat(fIlluminantXYZ[2]), kWhitePointD50[2]),
"Illuminant must be D50");
return_if_false(fTagCount <= 100, "Too many tags");
return true;
}
};
template <class T>
static bool safe_add(T arg1, T arg2, size_t* result) {
SkASSERT(arg1 >= 0);
SkASSERT(arg2 >= 0);
if (arg1 >= 0 && arg2 <= std::numeric_limits<T>::max() - arg1) {
T sum = arg1 + arg2;
if (sum <= std::numeric_limits<size_t>::max()) {
*result = static_cast<size_t>(sum);
return true;
}
}
return false;
}
static bool safe_mul(uint32_t arg1, uint32_t arg2, uint32_t* result) {
uint64_t product64 = (uint64_t) arg1 * (uint64_t) arg2;
uint32_t product32 = (uint32_t) product64;
if (product32 != product64) {
return false;
}
*result = product32;
return true;
}
struct ICCTag {
uint32_t fSignature;
uint32_t fOffset;
uint32_t fLength;
const uint8_t* init(const uint8_t* src) {
fSignature = read_big_endian_u32(src);
fOffset = read_big_endian_u32(src + 4);
fLength = read_big_endian_u32(src + 8);
return src + 12;
}
bool valid(size_t len) {
size_t tagEnd;
return_if_false(safe_add(fOffset, fLength, &tagEnd),
"Tag too large, overflows integer addition");
return_if_false(tagEnd <= len, "Tag too large for ICC profile");
return true;
}
const uint8_t* addr(const uint8_t* src) const {
return src + fOffset;
}
static const ICCTag* Find(const ICCTag tags[], int count, uint32_t signature) {
for (int i = 0; i < count; ++i) {
if (tags[i].fSignature == signature) {
return &tags[i];
}
}
return nullptr;
}
};
static bool load_xyz(float dst[3], const uint8_t* src, size_t len) {
if (len < 20) {
SkColorSpacePrintf("XYZ tag is too small (%d bytes)", len);
return false;
}
dst[0] = SkFixedToFloat(read_big_endian_i32(src + 8));
dst[1] = SkFixedToFloat(read_big_endian_i32(src + 12));
dst[2] = SkFixedToFloat(read_big_endian_i32(src + 16));
SkColorSpacePrintf("XYZ %g %g %g\n", dst[0], dst[1], dst[2]);
return true;
}
static SkGammas::Type set_gamma_value(SkGammas::Data* data, float value) {
if (color_space_almost_equal(2.2f, value)) {
data->fNamed = k2Dot2Curve_SkGammaNamed;
return SkGammas::Type::kNamed_Type;
}
if (color_space_almost_equal(1.0f, value)) {
data->fNamed = kLinear_SkGammaNamed;
return SkGammas::Type::kNamed_Type;
}
if (color_space_almost_equal(0.0f, value)) {
return SkGammas::Type::kNone_Type;
}
data->fValue = value;
return SkGammas::Type::kValue_Type;
}
static float read_big_endian_16_dot_16(const uint8_t buf[4]) {
// It just so happens that SkFixed is also 16.16!
return SkFixedToFloat(read_big_endian_i32(buf));
}
/**
* @param outData Set to the appropriate value on success. If we have table or
* parametric gamma, it is the responsibility of the caller to set
* fOffset.
* @param outParams If this is a parametric gamma, this is set to the appropriate
* parameters on success.
* @param outTagBytes Will be set to the length of the tag on success.
* @src Pointer to tag data.
* @len Length of tag data in bytes.
*
* @return kNone_Type on failure, otherwise the type of the gamma tag.
*/
static SkGammas::Type parse_gamma(SkGammas::Data* outData, SkColorSpaceTransferFn* outParams,
size_t* outTagBytes, const uint8_t* src, size_t len) {
if (len < 12) {
SkColorSpacePrintf("gamma tag is too small (%d bytes)", len);
return SkGammas::Type::kNone_Type;
}
// In the case of consecutive gamma tags, we need to count the number of bytes in the
// tag, so that we can move on to the next tag.
size_t tagBytes;
uint32_t type = read_big_endian_u32(src);
// Bytes 4-7 are reserved and should be set to zero.
switch (type) {
case kTAG_CurveType: {
uint32_t count = read_big_endian_u32(src + 8);
// tagBytes = 12 + 2 * count
// We need to do safe addition here to avoid integer overflow.
if (!safe_add(count, count, &tagBytes) ||
!safe_add((size_t) 12, tagBytes, &tagBytes))
{
SkColorSpacePrintf("Invalid gamma count");
return SkGammas::Type::kNone_Type;
}
if (len < tagBytes) {
SkColorSpacePrintf("gamma tag is too small (%d bytes)", len);
return SkGammas::Type::kNone_Type;
}
*outTagBytes = tagBytes;
if (0 == count) {
// Some tags require a gamma curve, but the author doesn't actually want
// to transform the data. In this case, it is common to see a curve with
// a count of 0.
outData->fNamed = kLinear_SkGammaNamed;
return SkGammas::Type::kNamed_Type;
}
const uint16_t* table = (const uint16_t*) (src + 12);
if (1 == count) {
// The table entry is the gamma (with a bias of 256).
float value = (read_big_endian_u16((const uint8_t*) table)) / 256.0f;
SkColorSpacePrintf("gamma %g\n", value);
return set_gamma_value(outData, value);
}
// This optimization is especially important for A2B profiles, where we do
// not resize tables or interpolate lookups.
if (2 == count) {
if (0 == read_big_endian_u16((const uint8_t*) &table[0]) &&
65535 == read_big_endian_u16((const uint8_t*) &table[1])) {
outData->fNamed = kLinear_SkGammaNamed;
return SkGammas::Type::kNamed_Type;
}
}
// Check for frequently occurring sRGB curves.
// We do this by sampling a few values and see if they match our expectation.
// A more robust solution would be to compare each value in this curve against
// an sRGB curve to see if we remain below an error threshold. At this time,
// we haven't seen any images in the wild that make this kind of
// calculation necessary. We encounter identical gamma curves over and
// over again, but relatively few variations.
if (1024 == count) {
// The magic values were chosen because they match both the very common
// HP sRGB gamma table and the less common Canon sRGB gamma table (which use
// different rounding rules).
if (0 == read_big_endian_u16((const uint8_t*) &table[0]) &&
3366 == read_big_endian_u16((const uint8_t*) &table[257]) &&
14116 == read_big_endian_u16((const uint8_t*) &table[513]) &&
34318 == read_big_endian_u16((const uint8_t*) &table[768]) &&
65535 == read_big_endian_u16((const uint8_t*) &table[1023])) {
outData->fNamed = kSRGB_SkGammaNamed;
return SkGammas::Type::kNamed_Type;
}
}
if (26 == count) {
// The magic values match a clever "minimum size" approach to representing sRGB.
// code.facebook.com/posts/411525055626587/under-the-hood-improving-facebook-photos
if (0 == read_big_endian_u16((const uint8_t*) &table[0]) &&
3062 == read_big_endian_u16((const uint8_t*) &table[6]) &&
12824 == read_big_endian_u16((const uint8_t*) &table[12]) &&
31237 == read_big_endian_u16((const uint8_t*) &table[18]) &&
65535 == read_big_endian_u16((const uint8_t*) &table[25])) {
outData->fNamed = kSRGB_SkGammaNamed;
return SkGammas::Type::kNamed_Type;
}
}
if (4096 == count) {
// The magic values were chosen because they match Nikon, Epson, and
// lcms2 sRGB gamma tables (all of which use different rounding rules).
if (0 == read_big_endian_u16((const uint8_t*) &table[0]) &&
950 == read_big_endian_u16((const uint8_t*) &table[515]) &&
3342 == read_big_endian_u16((const uint8_t*) &table[1025]) &&
14079 == read_big_endian_u16((const uint8_t*) &table[2051]) &&
65535 == read_big_endian_u16((const uint8_t*) &table[4095])) {
outData->fNamed = kSRGB_SkGammaNamed;
return SkGammas::Type::kNamed_Type;
}
}
// Otherwise, we will represent gamma with a table.
outData->fTable.fSize = count;
return SkGammas::Type::kTable_Type;
}
case kTAG_ParaCurveType: {
// Determine the format of the parametric curve tag.
uint16_t format = read_big_endian_u16(src + 8);
if (format > kGABCDEF_ParaCurveType) {
SkColorSpacePrintf("Unsupported gamma tag type %d\n", type);
return SkGammas::Type::kNone_Type;
}
if (kExponential_ParaCurveType == format) {
tagBytes = 12 + 4;
if (len < tagBytes) {
SkColorSpacePrintf("gamma tag is too small (%d bytes)", len);
return SkGammas::Type::kNone_Type;
}
// Y = X^g
float g = read_big_endian_16_dot_16(src + 12);
*outTagBytes = tagBytes;
return set_gamma_value(outData, g);
}
// Here's where the real parametric gammas start. There are many
// permutations of the same equations.
//
// Y = (aX + b)^g + e for X >= d
// Y = cX + f otherwise
//
// We will fill in with zeros as necessary to always match the above form.
if (len < 24) {
SkColorSpacePrintf("gamma tag is too small (%d bytes)", len);
return SkGammas::Type::kNone_Type;
}
float g = read_big_endian_16_dot_16(src + 12);
float a = read_big_endian_16_dot_16(src + 16);
float b = read_big_endian_16_dot_16(src + 20);
float c = 0.0f, d = 0.0f, e = 0.0f, f = 0.0f;
switch(format) {
case kGAB_ParaCurveType:
tagBytes = 12 + 12;
// Y = (aX + b)^g for X >= -b/a
// Y = 0 otherwise
d = -b / a;
break;
case kGABC_ParaCurveType:
tagBytes = 12 + 16;
if (len < tagBytes) {
SkColorSpacePrintf("gamma tag is too small (%d bytes)", len);
return SkGammas::Type::kNone_Type;
}
// Y = (aX + b)^g + e for X >= -b/a
// Y = e otherwise
e = read_big_endian_16_dot_16(src + 24);
d = -b / a;
f = e;
break;
case kGABDE_ParaCurveType:
tagBytes = 12 + 20;
if (len < tagBytes) {
SkColorSpacePrintf("gamma tag is too small (%d bytes)", len);
return SkGammas::Type::kNone_Type;
}
// Y = (aX + b)^g for X >= d
// Y = cX otherwise
c = read_big_endian_16_dot_16(src + 24);
d = read_big_endian_16_dot_16(src + 28);
break;
case kGABCDEF_ParaCurveType:
tagBytes = 12 + 28;
if (len < tagBytes) {
SkColorSpacePrintf("gamma tag is too small (%d bytes)", len);
return SkGammas::Type::kNone_Type;
}
// Y = (aX + b)^g + e for X >= d
// Y = cX + f otherwise
c = read_big_endian_16_dot_16(src + 24);
d = read_big_endian_16_dot_16(src + 28);
e = read_big_endian_16_dot_16(src + 32);
f = read_big_endian_16_dot_16(src + 36);
break;
default:
SkASSERT(false);
return SkGammas::Type::kNone_Type;
}
outParams->fG = g;
outParams->fA = a;
outParams->fB = b;
outParams->fC = c;
outParams->fD = d;
outParams->fE = e;
outParams->fF = f;
if (!is_valid_transfer_fn(*outParams)) {
return SkGammas::Type::kNone_Type;
}
if (is_almost_srgb(*outParams)) {
outData->fNamed = kSRGB_SkGammaNamed;
return SkGammas::Type::kNamed_Type;
}
if (is_almost_2dot2(*outParams)) {
outData->fNamed = k2Dot2Curve_SkGammaNamed;
return SkGammas::Type::kNamed_Type;
}
*outTagBytes = tagBytes;
return SkGammas::Type::kParam_Type;
}
default:
SkColorSpacePrintf("Unsupported gamma tag type %d\n", type);
return SkGammas::Type::kNone_Type;
}
}
/**
* Returns the additional size in bytes needed to store the gamma tag.
*/
static size_t gamma_alloc_size(SkGammas::Type type, const SkGammas::Data& data) {
switch (type) {
case SkGammas::Type::kNamed_Type:
case SkGammas::Type::kValue_Type:
return 0;
case SkGammas::Type::kTable_Type:
return sizeof(float) * data.fTable.fSize;
case SkGammas::Type::kParam_Type:
return sizeof(SkColorSpaceTransferFn);
default:
SkASSERT(false);
return 0;
}
}
/**
* Sets invalid gamma to the default value.
*/
static void handle_invalid_gamma(SkGammas::Type* type, SkGammas::Data* data) {
if (SkGammas::Type::kNone_Type == *type) {
*type = SkGammas::Type::kNamed_Type;
// Guess sRGB in the case of a malformed transfer function.
data->fNamed = kSRGB_SkGammaNamed;
}
}
/**
* Finish loading the gammas, now that we have allocated memory for the SkGammas struct.
*
* There's nothing to do for the simple cases, but for table gammas we need to actually
* read the table into heap memory. And for parametric gammas, we need to copy over the
* parameter values.
*
* @param memory Pointer to start of the SkGammas memory block
* @param offset Bytes of memory (after the SkGammas struct) that are already in use.
* @param data In-out variable. Will fill in the offset to the table or parameters
* if necessary.
* @param params Parameters for gamma curve. Only initialized/used when we have a
* parametric gamma.
* @param src Pointer to start of the gamma tag.
*
* @return Additional bytes of memory that are being used by this gamma curve.
*/
static size_t load_gammas(void* memory, size_t offset, SkGammas::Type type,
SkGammas::Data* data, const SkColorSpaceTransferFn& params,
const uint8_t* src) {
void* storage = SkTAddOffset<void>(memory, offset + sizeof(SkGammas));
switch (type) {
case SkGammas::Type::kNamed_Type:
case SkGammas::Type::kValue_Type:
// Nothing to do here.
return 0;
case SkGammas::Type::kTable_Type: {
data->fTable.fOffset = offset;
float* outTable = (float*) storage;
const uint16_t* inTable = (const uint16_t*) (src + 12);
for (int i = 0; i < data->fTable.fSize; i++) {
outTable[i] = (read_big_endian_u16((const uint8_t*) &inTable[i])) / 65535.0f;
}
return sizeof(float) * data->fTable.fSize;
}
case SkGammas::Type::kParam_Type:
data->fTable.fOffset = offset;
memcpy(storage, &params, sizeof(SkColorSpaceTransferFn));
return sizeof(SkColorSpaceTransferFn);
default:
SkASSERT(false);
return 0;
}
}
static constexpr uint32_t kTAG_AtoBType = SkSetFourByteTag('m', 'A', 'B', ' ');
static constexpr uint32_t kTAG_lut8Type = SkSetFourByteTag('m', 'f', 't', '1');
static constexpr uint32_t kTAG_lut16Type = SkSetFourByteTag('m', 'f', 't', '2');
static bool load_color_lut(sk_sp<SkColorLookUpTable>* colorLUT, uint32_t inputChannels,
size_t precision, const uint8_t gridPoints[3], const uint8_t* src,
size_t len) {
switch (precision) {
case 1: // 8-bit data
case 2: // 16-bit data
break;
default:
SkColorSpacePrintf("Color LUT precision must be 8-bit or 16-bit. Found: %d-bit\n",
8*precision);
return false;
}
uint32_t numEntries = SkColorLookUpTable::kOutputChannels;
for (uint32_t i = 0; i < inputChannels; i++) {
if (1 >= gridPoints[i]) {
SkColorSpacePrintf("Each input channel must have at least two grid points.");
return false;
}
if (!safe_mul(numEntries, gridPoints[i], &numEntries)) {
SkColorSpacePrintf("Too many entries in Color LUT.");
return false;
}
}
uint32_t clutBytes;
if (!safe_mul(numEntries, precision, &clutBytes)) {
SkColorSpacePrintf("Too many entries in Color LUT.\n");
return false;
}
if (len < clutBytes) {
SkColorSpacePrintf("Color LUT tag is too small (%d / %d bytes).\n", len, clutBytes);
return false;
}
// Movable struct colorLUT has ownership of fTable.
void* memory = sk_malloc_throw(sizeof(SkColorLookUpTable) + sizeof(float) * numEntries);
*colorLUT = sk_sp<SkColorLookUpTable>(new (memory) SkColorLookUpTable(inputChannels,
gridPoints));
float* table = SkTAddOffset<float>(memory, sizeof(SkColorLookUpTable));
const uint8_t* ptr = src;
for (uint32_t i = 0; i < numEntries; i++, ptr += precision) {
if (1 == precision) {
table[i] = ((float) *ptr) / 255.0f;
} else {
table[i] = ((float) read_big_endian_u16(ptr)) / 65535.0f;
}
}
return true;
}
/**
* Reads a matrix out of an A2B tag of an ICC profile.
* If |translate| is true, it will load a 3x4 matrix out that corresponds to a XYZ
* transform as well as a translation, and if |translate| is false it only loads a
* 3x3 matrix with no translation
*
* @param matrix The matrix to store the result in
* @param src Data to load the matrix out of.
* @param len The length of |src|.
* Must have 48 bytes if |translate| is set and 36 bytes otherwise.
* @param translate Whether to read the translation column or not
* @param pcs The profile connection space of the profile this matrix is for
*
* @return false on failure, true on success
*/
static bool load_matrix(SkMatrix44* matrix, const uint8_t* src, size_t len, bool translate,
SkColorSpace_A2B::PCS pcs) {
const size_t minLen = translate ? 48 : 36;
if (len < minLen) {
SkColorSpacePrintf("Matrix tag is too small (%d bytes).", len);
return false;
}
float encodingFactor;
switch (pcs) {
case SkColorSpace_A2B::PCS::kLAB:
encodingFactor = 1.f;
break;
case SkColorSpace_A2B::PCS::kXYZ:
encodingFactor = 65535 / 32768.f;
break;
default:
encodingFactor = 1.f;
SkASSERT(false);
break;
}
float array[16];
array[ 0] = encodingFactor * SkFixedToFloat(read_big_endian_i32(src));
array[ 1] = encodingFactor * SkFixedToFloat(read_big_endian_i32(src + 4));
array[ 2] = encodingFactor * SkFixedToFloat(read_big_endian_i32(src + 8));
array[ 4] = encodingFactor * SkFixedToFloat(read_big_endian_i32(src + 12));
array[ 5] = encodingFactor * SkFixedToFloat(read_big_endian_i32(src + 16));
array[ 6] = encodingFactor * SkFixedToFloat(read_big_endian_i32(src + 20));
array[ 8] = encodingFactor * SkFixedToFloat(read_big_endian_i32(src + 24));
array[ 9] = encodingFactor * SkFixedToFloat(read_big_endian_i32(src + 28));
array[10] = encodingFactor * SkFixedToFloat(read_big_endian_i32(src + 32));
if (translate) {
array[ 3] = encodingFactor * SkFixedToFloat(read_big_endian_i32(src + 36)); // translate R
array[ 7] = encodingFactor * SkFixedToFloat(read_big_endian_i32(src + 40)); // translate G
array[11] = encodingFactor * SkFixedToFloat(read_big_endian_i32(src + 44)); // translate B
} else {
array[ 3] = 0.0f;
array[ 7] = 0.0f;
array[11] = 0.0f;
}
array[12] = 0.0f;
array[13] = 0.0f;
array[14] = 0.0f;
array[15] = 1.0f;
matrix->setRowMajorf(array);
SkColorSpacePrintf("A2B0 matrix loaded:\n");
for (int r = 0; r < 4; ++r) {
SkColorSpacePrintf("|");
for (int c = 0; c < 4; ++c) {
SkColorSpacePrintf(" %f ", matrix->get(r, c));
}
SkColorSpacePrintf("|\n");
}
return true;
}
static inline SkGammaNamed is_named(const sk_sp<SkGammas>& gammas) {
for (uint8_t i = 0; i < gammas->channels(); ++i) {
if (!gammas->isNamed(i) || gammas->data(i).fNamed != gammas->data(0).fNamed) {
return kNonStandard_SkGammaNamed;
}
}
return gammas->data(0).fNamed;
}
/**
* Parse and load an entire stored curve. Handles invalid gammas as well.
*
* There's nothing to do for the simple cases, but for table gammas we need to actually
* read the table into heap memory. And for parametric gammas, we need to copy over the
* parameter values.
*
* @param gammaNamed Out-variable. The named gamma curve.
* @param gammas Out-variable. The stored gamma curve information. Can be null if
* gammaNamed is a named curve
* @param inputChannels The number of gamma input channels
* @param rTagPtr Pointer to start of the gamma tag.
* @param taglen The size in bytes of the tag
*
* @return false on failure, true on success
*/
static bool parse_and_load_gamma(SkGammaNamed* gammaNamed, sk_sp<SkGammas>* gammas,
uint8_t inputChannels, const uint8_t* tagSrc, size_t tagLen) {
SkGammas::Data data[kMaxColorChannels];
SkColorSpaceTransferFn params[kMaxColorChannels];
SkGammas::Type type[kMaxColorChannels];
const uint8_t* tagPtr[kMaxColorChannels];
tagPtr[0] = tagSrc;
*gammaNamed = kNonStandard_SkGammaNamed;
// On an invalid first gamma, tagBytes remains set as zero. This causes the two
// subsequent to be treated as identical (which is what we want).
size_t tagBytes = 0;
type[0] = parse_gamma(&data[0], &params[0], &tagBytes, tagPtr[0], tagLen);
handle_invalid_gamma(&type[0], &data[0]);
size_t alignedTagBytes = SkAlign4(tagBytes);
bool allChannelsSame = false;
if (inputChannels * alignedTagBytes <= tagLen) {
allChannelsSame = true;
for (uint8_t i = 1; i < inputChannels; ++i) {
if (0 != memcmp(tagSrc, tagSrc + i * alignedTagBytes, tagBytes)) {
allChannelsSame = false;
break;
}
}
}
if (allChannelsSame) {
if (SkGammas::Type::kNamed_Type == type[0]) {
*gammaNamed = data[0].fNamed;
} else {
size_t allocSize = sizeof(SkGammas);
return_if_false(safe_add(allocSize, gamma_alloc_size(type[0], data[0]), &allocSize),
"SkGammas struct is too large to allocate");
void* memory = sk_malloc_throw(allocSize);
*gammas = sk_sp<SkGammas>(new (memory) SkGammas(inputChannels));
load_gammas(memory, 0, type[0], &data[0], params[0], tagPtr[0]);
for (uint8_t channel = 0; channel < inputChannels; ++channel) {
(*gammas)->fType[channel] = type[0];
(*gammas)->fData[channel] = data[0];
}
}
} else {
for (uint8_t channel = 1; channel < inputChannels; ++channel) {
tagPtr[channel] = tagPtr[channel - 1] + alignedTagBytes;
tagLen = tagLen > alignedTagBytes ? tagLen - alignedTagBytes : 0;
tagBytes = 0;
type[channel] = parse_gamma(&data[channel], &params[channel], &tagBytes,
tagPtr[channel], tagLen);
handle_invalid_gamma(&type[channel], &data[channel]);
alignedTagBytes = SkAlign4(tagBytes);
}
size_t allocSize = sizeof(SkGammas);
for (uint8_t channel = 0; channel < inputChannels; ++channel) {
return_if_false(safe_add(allocSize, gamma_alloc_size(type[channel], data[channel]),
&allocSize),
"SkGammas struct is too large to allocate");
}
void* memory = sk_malloc_throw(allocSize);
*gammas = sk_sp<SkGammas>(new (memory) SkGammas(inputChannels));
uint32_t offset = 0;
for (uint8_t channel = 0; channel < inputChannels; ++channel) {
(*gammas)->fType[channel] = type[channel];
offset += load_gammas(memory,offset, type[channel], &data[channel], params[channel],
tagPtr[channel]);
(*gammas)->fData[channel] = data[channel];
}
}
if (kNonStandard_SkGammaNamed == *gammaNamed) {
*gammaNamed = is_named(*gammas);
if (kNonStandard_SkGammaNamed != *gammaNamed) {
// No need to keep the gammas struct, the enum is enough.
*gammas = nullptr;
}
}
return true;
}
static bool is_lut_gamma_linear(const uint8_t* src, size_t count, size_t precision) {
// check for linear gamma (this is very common in lut gammas, as they aren't optional)
const float normalizeX = 1.f / (count - 1);
for (uint32_t x = 0; x < count; ++x) {
const float y = precision == 1 ? (src[x] / 255.f)
: (read_big_endian_u16(src + 2*x) / 65535.f);
if (!color_space_almost_equal(x * normalizeX, y)) {
return false;
}
}
return true;
}
static bool load_lut_gammas(sk_sp<SkGammas>* gammas, SkGammaNamed* gammaNamed, size_t numTables,
size_t entriesPerTable, size_t precision, const uint8_t* src,
size_t len) {
if (precision != 1 && precision != 2) {
SkColorSpacePrintf("Invalid gamma table precision %d\n", precision);
return false;
}
uint32_t totalEntries;
return_if_false(safe_mul(entriesPerTable, numTables, &totalEntries),
"Too many entries in gamma table.");
uint32_t readBytes;
return_if_false(safe_mul(precision, totalEntries, &readBytes),
"SkGammas struct is too large to read");
if (len < readBytes) {
SkColorSpacePrintf("Gamma table is too small. Provided: %d. Required: %d\n",
len, readBytes);
return false;
}
uint32_t writeBytesPerChannel;
return_if_false(safe_mul(sizeof(float), entriesPerTable, &writeBytesPerChannel),
"SkGammas struct is too large to allocate");
const size_t readBytesPerChannel = precision * entriesPerTable;
size_t numTablesToUse = 1;
for (size_t tableIndex = 1; tableIndex < numTables; ++tableIndex) {
if (0 != memcmp(src, src + readBytesPerChannel * tableIndex, readBytesPerChannel)) {
numTablesToUse = numTables;
break;
}
}
if (1 == numTablesToUse) {
if (is_lut_gamma_linear(src, entriesPerTable, precision)) {
*gammaNamed = kLinear_SkGammaNamed;
return true;
}
}
*gammaNamed = kNonStandard_SkGammaNamed;
uint32_t writetableBytes;
return_if_false(safe_mul(numTablesToUse, writeBytesPerChannel, &writetableBytes),
"SkGammas struct is too large to allocate");
size_t allocSize = sizeof(SkGammas);
return_if_false(safe_add(allocSize, (size_t)writetableBytes, &allocSize),
"SkGammas struct is too large to allocate");
void* memory = sk_malloc_throw(allocSize);
*gammas = sk_sp<SkGammas>(new (memory) SkGammas(numTables));
for (size_t tableIndex = 0; tableIndex < numTablesToUse; ++tableIndex) {
const uint8_t* ptr = src + readBytesPerChannel * tableIndex;
const size_t offset = sizeof(SkGammas) + tableIndex * writeBytesPerChannel;
float* table = SkTAddOffset<float>(memory, offset);
if (1 == precision) {
for (uint32_t i = 0; i < entriesPerTable; ++i, ptr += 1) {
table[i] = ((float) *ptr) / 255.0f;
}
} else if (2 == precision) {
for (uint32_t i = 0; i < entriesPerTable; ++i, ptr += 2) {
table[i] = ((float) read_big_endian_u16(ptr)) / 65535.0f;
}
}
}
SkASSERT(1 == numTablesToUse|| numTables == numTablesToUse);
size_t tableOffset = 0;
for (size_t tableIndex = 0; tableIndex < numTables; ++tableIndex) {
(*gammas)->fType[tableIndex] = SkGammas::Type::kTable_Type;
(*gammas)->fData[tableIndex].fTable.fOffset = tableOffset;
(*gammas)->fData[tableIndex].fTable.fSize = entriesPerTable;
if (numTablesToUse > 1) {
tableOffset += writeBytesPerChannel;
}
}
return true;
}
bool load_a2b0_a_to_b_type(std::vector<SkColorSpace_A2B::Element>* elements, const uint8_t* src,
size_t len, SkColorSpace_A2B::PCS pcs) {
SkASSERT(len >= 32);
// Read the number of channels. The four bytes (4-7) that we skipped are reserved and
// must be zero.
const uint8_t inputChannels = src[8];
const uint8_t outputChannels = src[9];
if (SkColorLookUpTable::kOutputChannels != outputChannels) {
// We only handle RGB outputs. The number of output channels must be 3.
SkColorSpacePrintf("Output channels (%d) must equal 3 in A to B tag.\n", outputChannels);
return false;
}
if (inputChannels == 0 || inputChannels > 4) {
// And we only support 4 input channels.
// ICC says up to 16 but our decode can only handle 4.
// It could easily be extended to support up to 8, but we only allow CMYK/RGB
// input color spaces which are 3 and 4 so let's restrict it to 4 instead of 8.
// We can always change this check when we support bigger input spaces.
SkColorSpacePrintf("Input channels (%d) must be between 1 and 4 in A to B tag.\n",
inputChannels);
return false;
}
// It is important that these are loaded in the order of application, as the
// order you construct an A2B color space's elements is the order it is applied
// If the offset is non-zero it indicates that the element is present.
const uint32_t offsetToACurves = read_big_endian_i32(src + 28);
if (0 != offsetToACurves && offsetToACurves < len) {
const size_t tagLen = len - offsetToACurves;
SkGammaNamed gammaNamed;
sk_sp<SkGammas> gammas;
if (!parse_and_load_gamma(&gammaNamed, &gammas, inputChannels, src + offsetToACurves,
tagLen)) {
return false;
}
if (gammas) {
elements->push_back(SkColorSpace_A2B::Element(std::move(gammas)));
} else if (kLinear_SkGammaNamed != gammaNamed) {
elements->push_back(SkColorSpace_A2B::Element(gammaNamed, inputChannels));
}
}
const uint32_t offsetToColorLUT = read_big_endian_i32(src + 24);
if (0 != offsetToColorLUT && offsetToColorLUT < len) {
sk_sp<SkColorLookUpTable> colorLUT;
const uint8_t* clutSrc = src + offsetToColorLUT;
const size_t clutLen = len - offsetToColorLUT;
// 16 bytes reserved for grid points, 1 for precision, 3 for padding.
// The color LUT data follows after this header.
static constexpr uint32_t kColorLUTHeaderSize = 20;
if (clutLen < kColorLUTHeaderSize) {
SkColorSpacePrintf("Color LUT tag is too small (%d bytes).", clutLen);
return false;
}
SkASSERT(inputChannels <= kMaxColorChannels);
uint8_t gridPoints[kMaxColorChannels];
for (uint32_t i = 0; i < inputChannels; ++i) {
gridPoints[i] = clutSrc[i];
}
// Space is provided for a maximum of 16 input channels.
// Now we determine the precision of the table values.
const uint8_t precision = clutSrc[16];
if (!load_color_lut(&colorLUT, inputChannels, precision, gridPoints,
clutSrc + kColorLUTHeaderSize, clutLen - kColorLUTHeaderSize)) {
SkColorSpacePrintf("Failed to read color LUT from A to B tag.\n");
return false;
}
elements->push_back(SkColorSpace_A2B::Element(std::move(colorLUT)));
}
const uint32_t offsetToMCurves = read_big_endian_i32(src + 20);
if (0 != offsetToMCurves && offsetToMCurves < len) {
const size_t tagLen = len - offsetToMCurves;
SkGammaNamed gammaNamed;
sk_sp<SkGammas> gammas;
if (!parse_and_load_gamma(&gammaNamed, &gammas, outputChannels, src + offsetToMCurves,
tagLen)) {
return false;
}
if (gammas) {
elements->push_back(SkColorSpace_A2B::Element(std::move(gammas)));
} else if (kLinear_SkGammaNamed != gammaNamed) {
elements->push_back(SkColorSpace_A2B::Element(gammaNamed, outputChannels));
}
}
const uint32_t offsetToMatrix = read_big_endian_i32(src + 16);
if (0 != offsetToMatrix && offsetToMatrix < len) {
SkMatrix44 matrix(SkMatrix44::kUninitialized_Constructor);
if (!load_matrix(&matrix, src + offsetToMatrix, len - offsetToMatrix, true, pcs)) {
SkColorSpacePrintf("Failed to read matrix from A to B tag.\n");
} else if (!matrix.isIdentity()) {
elements->push_back(SkColorSpace_A2B::Element(matrix));
}
}
const uint32_t offsetToBCurves = read_big_endian_i32(src + 12);
if (0 != offsetToBCurves && offsetToBCurves < len) {
const size_t tagLen = len - offsetToBCurves;
SkGammaNamed gammaNamed;
sk_sp<SkGammas> gammas;
if (!parse_and_load_gamma(&gammaNamed, &gammas, outputChannels, src + offsetToBCurves,
tagLen)) {
return false;
}
if (gammas) {
elements->push_back(SkColorSpace_A2B::Element(std::move(gammas)));
} else if (kLinear_SkGammaNamed != gammaNamed) {
elements->push_back(SkColorSpace_A2B::Element(gammaNamed, outputChannels));
}
}
return true;
}
bool load_a2b0_lutn_type(std::vector<SkColorSpace_A2B::Element>* elements, const uint8_t* src,
size_t len, SkColorSpace_A2B::PCS pcs) {
const uint32_t type = read_big_endian_u32(src);
switch (type) {
case kTAG_lut8Type:
SkASSERT(len >= 48);
break;
case kTAG_lut16Type:
SkASSERT(len >= 52);
break;
default:
SkASSERT(false);
return false;
}
// Read the number of channels.
// The four bytes (4-7) that we skipped are reserved and must be zero.
const uint8_t inputChannels = src[8];
const uint8_t outputChannels = src[9];
if (SkColorLookUpTable::kOutputChannels != outputChannels) {
// We only handle RGB outputs. The number of output channels must be 3.
SkColorSpacePrintf("Output channels (%d) must equal 3 in A to B tag.\n", outputChannels);
return false;
}
if (inputChannels == 0 || inputChannels > 4) {
// And we only support 4 input channels.
// ICC says up to 16 but our decode can only handle 4.
// It could easily be extended to support up to 8, but we only allow CMYK/RGB
// input color spaces which are 3 and 4 so let's restrict it to 4 instead of 8.
// We can always change this check when we support bigger input spaces.
SkColorSpacePrintf("Input channels (%d) must be between 1 and 4 in A to B tag.\n",
inputChannels);
return false;
}
const uint8_t clutGridPoints = src[10];
// 11th byte reserved for padding (required to be zero)
SkMatrix44 matrix(SkMatrix44::kUninitialized_Constructor);
load_matrix(&matrix, &src[12], len - 12, false, pcs);
if (!matrix.isIdentity()) {
// ICC specs (10.8/10.9) say lut8/16Type profiles must have identity matrices
// if the input color space is not PCSXYZ, and we do not support PCSXYZ input color spaces
// so we should never encounter a non-identity matrix here.
// However, 2 test images from the ICC website have RGB input spaces and non-identity
// matrices so we're not going to fail here, despite being against the spec.
SkColorSpacePrintf("Warning: non-Identity matrix found in non-XYZ input color space"
"lut profile");
elements->push_back(SkColorSpace_A2B::Element(matrix));
}
size_t dataOffset = 48;
// # of input table entries
size_t inTableEntries = 256;
// # of output table entries
size_t outTableEntries = 256;
size_t precision = 1;
if (kTAG_lut16Type == type) {
dataOffset = 52;
inTableEntries = read_big_endian_u16(src + 48);
outTableEntries = read_big_endian_u16(src + 50);
precision = 2;
constexpr size_t kMaxLut16GammaEntries = 4096;
if (inTableEntries < 2) {
SkColorSpacePrintf("Too few (%d) input gamma table entries. Must have at least 2.\n",
inTableEntries);
return false;
} else if (inTableEntries > kMaxLut16GammaEntries) {
SkColorSpacePrintf("Too many (%d) input gamma table entries. Must have at most %d.\n",
inTableEntries, kMaxLut16GammaEntries);
return false;
}
if (outTableEntries < 2) {
SkColorSpacePrintf("Too few (%d) output gamma table entries. Must have at least 2.\n",
outTableEntries);
return false;
} else if (outTableEntries > kMaxLut16GammaEntries) {
SkColorSpacePrintf("Too many (%d) output gamma table entries. Must have at most %d.\n",
outTableEntries, kMaxLut16GammaEntries);
return false;
}
}
const size_t inputOffset = dataOffset;
return_if_false(len >= inputOffset, "A2B0 lutnType tag too small for input gamma table");
sk_sp<SkGammas> inputGammas;
SkGammaNamed inputGammaNamed;
if (!load_lut_gammas(&inputGammas, &inputGammaNamed, inputChannels, inTableEntries, precision,
src + inputOffset, len - inputOffset)) {
SkColorSpacePrintf("Failed to read input gammas from lutnType tag.\n");
return false;
}
SkASSERT(inputGammas || inputGammaNamed != kNonStandard_SkGammaNamed);
if (kLinear_SkGammaNamed != inputGammaNamed) {
if (kNonStandard_SkGammaNamed != inputGammaNamed) {
elements->push_back(SkColorSpace_A2B::Element(inputGammaNamed, inputChannels));
} else {
elements->push_back(SkColorSpace_A2B::Element(std::move(inputGammas)));
}
}
const size_t clutOffset = inputOffset + precision*inTableEntries*inputChannels;
return_if_false(len >= clutOffset, "A2B0 lutnType tag too small for CLUT");
sk_sp<SkColorLookUpTable> colorLUT;
const uint8_t gridPoints[kMaxColorChannels] = {
clutGridPoints, clutGridPoints, clutGridPoints, clutGridPoints
};
if (!load_color_lut(&colorLUT, inputChannels, precision, gridPoints, src + clutOffset,
len - clutOffset)) {
SkColorSpacePrintf("Failed to read color LUT from lutnType tag.\n");
return false;
}
SkASSERT(colorLUT);
elements->push_back(SkColorSpace_A2B::Element(std::move(colorLUT)));
size_t clutSize = precision * outputChannels;
for (int i = 0; i < inputChannels; ++i) {
clutSize *= clutGridPoints;
}
const size_t outputOffset = clutOffset + clutSize;
return_if_false(len >= outputOffset, "A2B0 lutnType tag too small for output gamma table");
sk_sp<SkGammas> outputGammas;
SkGammaNamed outputGammaNamed;
if (!load_lut_gammas(&outputGammas, &outputGammaNamed, outputChannels, outTableEntries,
precision, src + outputOffset, len - outputOffset)) {
SkColorSpacePrintf("Failed to read output gammas from lutnType tag.\n");
return false;
}
SkASSERT(outputGammas || outputGammaNamed != kNonStandard_SkGammaNamed);
if (kLinear_SkGammaNamed != outputGammaNamed) {
if (kNonStandard_SkGammaNamed != outputGammaNamed) {
elements->push_back(SkColorSpace_A2B::Element(outputGammaNamed, outputChannels));
} else {
elements->push_back(SkColorSpace_A2B::Element(std::move(outputGammas)));
}
}
return true;
}
static inline int icf_channels(SkColorSpace_Base::ICCTypeFlag iccType) {
switch (iccType) {
case SkColorSpace_Base::kRGB_ICCTypeFlag:
return 3;
case SkColorSpace_Base::kCMYK_ICCTypeFlag:
return 4;
default:
SkASSERT(false);
return 0;
}
}
static bool load_a2b0(std::vector<SkColorSpace_A2B::Element>* elements, const uint8_t* src,
size_t len, SkColorSpace_A2B::PCS pcs,
SkColorSpace_Base::ICCTypeFlag iccType) {
if (len < 4) {
return false;
}
const uint32_t type = read_big_endian_u32(src);
switch (type) {
case kTAG_AtoBType:
if (len < 32) {
SkColorSpacePrintf("A to B tag is too small (%d bytes).", len);
return false;
}
SkColorSpacePrintf("A2B0 tag is of type lutAtoBType\n");
if (!load_a2b0_a_to_b_type(elements, src, len, pcs)) {
return false;
}
break;
case kTAG_lut8Type:
if (len < 48) {
SkColorSpacePrintf("lut8 tag is too small (%d bytes).", len);
return false;
}
SkColorSpacePrintf("A2B0 tag of type lut8Type\n");
if (!load_a2b0_lutn_type(elements, src, len, pcs)) {
return false;
}
break;
case kTAG_lut16Type:
if (len < 52) {
SkColorSpacePrintf("lut16 tag is too small (%d bytes).", len);
return false;
}
SkColorSpacePrintf("A2B0 tag of type lut16Type\n");
if (!load_a2b0_lutn_type(elements, src, len, pcs)) {
return false;
}
break;
default:
SkColorSpacePrintf("Unsupported A to B tag type: %c%c%c%c\n", (type>>24)&0xFF,
(type>>16)&0xFF, (type>>8)&0xFF, type&0xFF);
return false;
}
SkASSERT(SkColorSpace_A2B::PCS::kLAB == pcs || SkColorSpace_A2B::PCS::kXYZ == pcs);
static constexpr int kPCSChannels = 3; // must be PCSLAB or PCSXYZ
if (elements->empty()) {
return kPCSChannels == icf_channels(iccType);
}
// now let's verify that the input/output channels of each A2B element actually match up
if (icf_channels(iccType) != elements->front().inputChannels()) {
SkColorSpacePrintf("Input channel count does not match first A2B element's input count");
return false;
}
for (size_t i = 1; i < elements->size(); ++i) {
if ((*elements)[i - 1].outputChannels() != (*elements)[i].inputChannels()) {
SkColorSpacePrintf("A2B elements don't agree in input/output channel counts");
return false;
}
}
if (kPCSChannels != elements->back().outputChannels()) {
SkColorSpacePrintf("PCS channel count doesn't match last A2B element's output count");
return false;
}
return true;
}
static bool tag_equals(const ICCTag* a, const ICCTag* b, const uint8_t* base) {
if (!a || !b) {
return a == b;
}
if (a->fLength != b->fLength) {
return false;
}
if (a->fOffset == b->fOffset) {
return true;
}
return !memcmp(a->addr(base), b->addr(base), a->fLength);
}
static inline bool is_close_to_d50(const SkMatrix44& matrix) {
// rX + gX + bX
float X = matrix.getFloat(0, 0) + matrix.getFloat(0, 1) + matrix.getFloat(0, 2);
// rY + gY + bY
float Y = matrix.getFloat(1, 0) + matrix.getFloat(1, 1) + matrix.getFloat(1, 2);
// rZ + gZ + bZ
float Z = matrix.getFloat(2, 0) + matrix.getFloat(2, 1) + matrix.getFloat(2, 2);
static const float kD50_WhitePoint[3] = { 0.96420f, 1.00000f, 0.82491f };
// This is a bit more lenient than QCMS and Adobe. Is there a reason to be stricter here?
return (SkTAbs(X - kD50_WhitePoint[0]) <= 0.04f) &&
(SkTAbs(Y - kD50_WhitePoint[1]) <= 0.04f) &&
(SkTAbs(Z - kD50_WhitePoint[2]) <= 0.04f);
}
static sk_sp<SkColorSpace> make_xyz(const ICCProfileHeader& header, ICCTag* tags, int tagCount,
const uint8_t* base, sk_sp<SkData> profileData) {
if (kLAB_PCSSpace == header.fPCS) {
return nullptr;
}
// Recognize the rXYZ, gXYZ, and bXYZ tags.
const ICCTag* r = ICCTag::Find(tags, tagCount, kTAG_rXYZ);
const ICCTag* g = ICCTag::Find(tags, tagCount, kTAG_gXYZ);
const ICCTag* b = ICCTag::Find(tags, tagCount, kTAG_bXYZ);
if (!r || !g || !b) {
return nullptr;
}
float toXYZ[9];
if (!load_xyz(&toXYZ[0], r->addr(base), r->fLength) ||
!load_xyz(&toXYZ[3], g->addr(base), g->fLength) ||
!load_xyz(&toXYZ[6], b->addr(base), b->fLength))
{
return_null("Need valid rgb tags for XYZ space");
}
SkMatrix44 mat(SkMatrix44::kUninitialized_Constructor);
mat.set3x3(toXYZ[0], toXYZ[1], toXYZ[2],
toXYZ[3], toXYZ[4], toXYZ[5],
toXYZ[6], toXYZ[7], toXYZ[8]);
if (!is_close_to_d50(mat)) {
return_null("XYZ matrix is not D50");
}
// If some, but not all, of the gamma tags are missing, assume that all
// gammas are meant to be the same.
r = ICCTag::Find(tags, tagCount, kTAG_rTRC);
g = ICCTag::Find(tags, tagCount, kTAG_gTRC);
b = ICCTag::Find(tags, tagCount, kTAG_bTRC);
if ((!r || !g || !b)) {
if (!r) {
r = g ? g : b;
}
if (!g) {
g = r ? r : b;
}
if (!b) {
b = r ? r : g;
}
}
SkGammaNamed gammaNamed = kNonStandard_SkGammaNamed;
sk_sp<SkGammas> gammas = nullptr;
size_t tagBytes;
if (r && g && b) {
if (tag_equals(r, g, base) && tag_equals(g, b, base)) {
SkGammas::Data data;
SkColorSpaceTransferFn params;
SkGammas::Type type =
parse_gamma(&data, &params, &tagBytes, r->addr(base), r->fLength);
handle_invalid_gamma(&type, &data);
if (SkGammas::Type::kNamed_Type == type) {
gammaNamed = data.fNamed;
} else {
size_t allocSize = sizeof(SkGammas);
if (!safe_add(allocSize, gamma_alloc_size(type, data), &allocSize)) {
return_null("SkGammas struct is too large to allocate");
}
void* memory = sk_malloc_throw(allocSize);
gammas = sk_sp<SkGammas>(new (memory) SkGammas(3));
load_gammas(memory, 0, type, &data, params, r->addr(base));
for (int i = 0; i < 3; ++i) {
gammas->fType[i] = type;
gammas->fData[i] = data;
}
}
} else {
SkGammas::Data rData;
SkColorSpaceTransferFn rParams;
SkGammas::Type rType =
parse_gamma(&rData, &rParams, &tagBytes, r->addr(base), r->fLength);
handle_invalid_gamma(&rType, &rData);
SkGammas::Data gData;
SkColorSpaceTransferFn gParams;
SkGammas::Type gType =
parse_gamma(&gData, &gParams, &tagBytes, g->addr(base), g->fLength);
handle_invalid_gamma(&gType, &gData);
SkGammas::Data bData;
SkColorSpaceTransferFn bParams;
SkGammas::Type bType =
parse_gamma(&bData, &bParams, &tagBytes, b->addr(base), b->fLength);
handle_invalid_gamma(&bType, &bData);
size_t allocSize = sizeof(SkGammas);
if (!safe_add(allocSize, gamma_alloc_size(rType, rData), &allocSize) ||
!safe_add(allocSize, gamma_alloc_size(gType, gData), &allocSize) ||
!safe_add(allocSize, gamma_alloc_size(bType, bData), &allocSize)) {
return_null("SkGammas struct is too large to allocate");
}
void* memory = sk_malloc_throw(allocSize);
gammas = sk_sp<SkGammas>(new (memory) SkGammas(3));
uint32_t offset = 0;
gammas->fType[0] = rType;
offset += load_gammas(memory, offset, rType, &rData, rParams,
r->addr(base));
gammas->fType[1] = gType;
offset += load_gammas(memory, offset, gType, &gData, gParams,
g->addr(base));
gammas->fType[2] = bType;
load_gammas(memory, offset, bType, &bData, bParams, b->addr(base));
gammas->fData[0] = rData;
gammas->fData[1] = gData;
gammas->fData[2] = bData;
}
} else {
// Guess sRGB if the profile is missing transfer functions.
gammaNamed = kSRGB_SkGammaNamed;
}
if (kNonStandard_SkGammaNamed == gammaNamed) {
// It's possible that we'll initially detect non-matching gammas, only for
// them to evaluate to the same named gamma curve.
gammaNamed = is_named(gammas);
}
if (kNonStandard_SkGammaNamed == gammaNamed) {
return sk_sp<SkColorSpace>(new SkColorSpace_XYZ(gammaNamed,
std::move(gammas),
mat, std::move(profileData)));
}
return SkColorSpace_Base::MakeRGB(gammaNamed, mat);
}
static sk_sp<SkColorSpace> make_gray(const ICCProfileHeader& header, ICCTag* tags, int tagCount,
const uint8_t* base, sk_sp<SkData> profileData) {
if (kLAB_PCSSpace == header.fPCS) {
return nullptr;
}
const ICCTag* grayTRC = ICCTag::Find(tags, tagCount, kTAG_kTRC);
if (!grayTRC) {
return_null("grayTRC tag required for monochrome profiles.");
}
SkGammas::Data data;
SkColorSpaceTransferFn params;
size_t tagBytes;
SkGammas::Type type =
parse_gamma(&data, &params, &tagBytes, grayTRC->addr(base), grayTRC->fLength);
handle_invalid_gamma(&type, &data);
SkMatrix44 toXYZD50(SkMatrix44::kIdentity_Constructor);
toXYZD50.setFloat(0, 0, kWhitePointD50[0]);
toXYZD50.setFloat(1, 1, kWhitePointD50[1]);
toXYZD50.setFloat(2, 2, kWhitePointD50[2]);
if (SkGammas::Type::kNamed_Type == type) {
return SkColorSpace_Base::MakeRGB(data.fNamed, toXYZD50);
}
size_t allocSize = sizeof(SkGammas);
if (!safe_add(allocSize, gamma_alloc_size(type, data), &allocSize)) {
return_null("SkGammas struct is too large to allocate");
}
void* memory = sk_malloc_throw(allocSize);
sk_sp<SkGammas> gammas = sk_sp<SkGammas>(new (memory) SkGammas(3));
load_gammas(memory, 0, type, &data, params, grayTRC->addr(base));
for (int i = 0; i < 3; ++i) {
gammas->fType[i] = type;
gammas->fData[i] = data;
}
return sk_sp<SkColorSpace>(new SkColorSpace_XYZ(kNonStandard_SkGammaNamed,
std::move(gammas),
toXYZD50, std::move(profileData)));
}
static sk_sp<SkColorSpace> make_a2b(SkColorSpace_Base::ICCTypeFlag iccType,
const ICCProfileHeader& header, ICCTag* tags, int tagCount,
const uint8_t* base, sk_sp<SkData> profileData) {
const ICCTag* a2b0 = ICCTag::Find(tags, tagCount, kTAG_A2B0);
if (a2b0) {
const SkColorSpace_A2B::PCS pcs = kXYZ_PCSSpace == header.fPCS
? SkColorSpace_A2B::PCS::kXYZ
: SkColorSpace_A2B::PCS::kLAB;
std::vector<SkColorSpace_A2B::Element> elements;
if (load_a2b0(&elements, a2b0->addr(base), a2b0->fLength, pcs, iccType)) {
return sk_sp<SkColorSpace>(new SkColorSpace_A2B(iccType, std::move(elements),
pcs, std::move(profileData)));
}
}
return nullptr;
}
sk_sp<SkColorSpace> SkColorSpace::MakeICC(const void* input, size_t len) {
return SkColorSpace_Base::MakeICC(input, len, SkColorSpace_Base::kRGB_ICCTypeFlag);
}
sk_sp<SkColorSpace> SkColorSpace_Base::MakeICC(const void* input, size_t len,
ICCTypeFlag desiredType) {
if (!input || len < kICCHeaderSize) {
return_null("Data is null or not large enough to contain an ICC profile");
}
// Create our own copy of the input.
void* memory = sk_malloc_throw(len);
memcpy(memory, input, len);
sk_sp<SkData> profileData = SkData::MakeFromMalloc(memory, len);
const uint8_t* base = profileData->bytes();
const uint8_t* ptr = base;
// Read the ICC profile header and check to make sure that it is valid.
ICCProfileHeader header;
header.init(ptr, len);
if (!header.valid()) {
return nullptr;
}
// Adjust ptr and len before reading the tags.
if (len < header.fSize) {
SkColorSpacePrintf("ICC profile might be truncated.\n");
} else if (len > header.fSize) {
SkColorSpacePrintf("Caller provided extra data beyond the end of the ICC profile.\n");
len = header.fSize;
}
ptr += kICCHeaderSize;
len -= kICCHeaderSize;
// Parse tag headers.
uint32_t tagCount = header.fTagCount;
SkColorSpacePrintf("ICC profile contains %d tags.\n", tagCount);
if (len < kICCTagTableEntrySize * tagCount) {
return_null("Not enough input data to read tag table entries");
}
SkAutoTArray<ICCTag> tags(tagCount);
for (uint32_t i = 0; i < tagCount; i++) {
ptr = tags[i].init(ptr);
SkColorSpacePrintf("[%d] %c%c%c%c %d %d\n", i, (tags[i].fSignature >> 24) & 0xFF,
(tags[i].fSignature >> 16) & 0xFF, (tags[i].fSignature >> 8) & 0xFF,
(tags[i].fSignature >> 0) & 0xFF, tags[i].fOffset, tags[i].fLength);
if (!tags[i].valid(kICCHeaderSize + len)) {
return_null("Tag is too large to fit in ICC profile");
}
}
switch (header.fInputColorSpace) {
case kRGB_ColorSpace: {
if (!(kRGB_ICCTypeFlag & desiredType)) {
return_null("Provided input color format (RGB) does not match profile.");
}
sk_sp<SkColorSpace> colorSpace =
make_xyz(header, tags.get(), tagCount, base, profileData);
if (colorSpace) {
return colorSpace;
}
desiredType = kRGB_ICCTypeFlag;
break;
}
case kGray_ColorSpace: {
if (!(kGray_ICCTypeFlag & desiredType)) {
return_null("Provided input color format (Gray) does not match profile.");
}
return make_gray(header, tags.get(), tagCount, base, profileData);
}
case kCMYK_ColorSpace:
if (!(kCMYK_ICCTypeFlag & desiredType)) {
return_null("Provided input color format (CMYK) does not match profile.");
}
desiredType = kCMYK_ICCTypeFlag;
break;
default:
return_null("ICC profile contains unsupported colorspace");
}
return make_a2b(desiredType, header, tags.get(), tagCount, base, profileData);
}