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+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ULTRAHDR_ICC_H
+#define ULTRAHDR_ICC_H
+
+#include <memory>
+
+#ifndef USE_BIG_ENDIAN_IN_ICC
+#define USE_BIG_ENDIAN_IN_ICC true
+#endif
+
+#undef Endian_SwapBE32
+#undef Endian_SwapBE16
+#if USE_BIG_ENDIAN_IN_ICC
+#define Endian_SwapBE32(n) EndianSwap32(n)
+#define Endian_SwapBE16(n) EndianSwap16(n)
+#else
+#define Endian_SwapBE32(n) (n)
+#define Endian_SwapBE16(n) (n)
+#endif
+
+#include "ultrahdr.h"
+#include "jpegr.h"
+#include "gainmapmath.h"
+#include "jpegrutils.h"
+
+namespace ultrahdr {
+
+typedef int32_t Fixed;
+#define Fixed1 (1 << 16)
+#define MaxS32FitsInFloat 2147483520
+#define MinS32FitsInFloat (-MaxS32FitsInFloat)
+#define FixedToFloat(x) ((x)*1.52587890625e-5f)
+
+typedef struct Matrix3x3 {
+ float vals[3][3];
+} Matrix3x3;
+
+// The D50 illuminant.
+constexpr float kD50_x = 0.9642f;
+constexpr float kD50_y = 1.0000f;
+constexpr float kD50_z = 0.8249f;
+
+enum {
+ // data_color_space
+ Signature_CMYK = 0x434D594B,
+ Signature_Gray = 0x47524159,
+ Signature_RGB = 0x52474220,
+
+ // pcs
+ Signature_Lab = 0x4C616220,
+ Signature_XYZ = 0x58595A20,
+};
+
+typedef uint32_t FourByteTag;
+static inline constexpr FourByteTag SetFourByteTag(char a, char b, char c, char d) {
+ return (((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | (uint32_t)d);
+}
+
+static constexpr char kICCIdentifier[] = "ICC_PROFILE";
+// 12 for the actual identifier, +2 for the chunk count and chunk index which
+// will always follow.
+static constexpr size_t kICCIdentifierSize = 14;
+
+// This is equal to the header size according to the ICC specification (128)
+// plus the size of the tag count (4). We include the tag count since we
+// always require it to be present anyway.
+static constexpr size_t kICCHeaderSize = 132;
+
+// Contains a signature (4), offset (4), and size (4).
+static constexpr size_t kICCTagTableEntrySize = 12;
+
+// size should be 20; 4 bytes for type descriptor, 4 bytes reserved, 12
+// bytes for a single XYZ number type (4 bytes per coordinate).
+static constexpr size_t kColorantTagSize = 20;
+
+static constexpr uint32_t kDisplay_Profile = SetFourByteTag('m', 'n', 't', 'r');
+static constexpr uint32_t kRGB_ColorSpace = SetFourByteTag('R', 'G', 'B', ' ');
+static constexpr uint32_t kXYZ_PCSSpace = SetFourByteTag('X', 'Y', 'Z', ' ');
+static constexpr uint32_t kACSP_Signature = SetFourByteTag('a', 'c', 's', 'p');
+
+static constexpr uint32_t kTAG_desc = SetFourByteTag('d', 'e', 's', 'c');
+static constexpr uint32_t kTAG_TextType = SetFourByteTag('m', 'l', 'u', 'c');
+static constexpr uint32_t kTAG_rXYZ = SetFourByteTag('r', 'X', 'Y', 'Z');
+static constexpr uint32_t kTAG_gXYZ = SetFourByteTag('g', 'X', 'Y', 'Z');
+static constexpr uint32_t kTAG_bXYZ = SetFourByteTag('b', 'X', 'Y', 'Z');
+static constexpr uint32_t kTAG_wtpt = SetFourByteTag('w', 't', 'p', 't');
+static constexpr uint32_t kTAG_rTRC = SetFourByteTag('r', 'T', 'R', 'C');
+static constexpr uint32_t kTAG_gTRC = SetFourByteTag('g', 'T', 'R', 'C');
+static constexpr uint32_t kTAG_bTRC = SetFourByteTag('b', 'T', 'R', 'C');
+static constexpr uint32_t kTAG_cicp = SetFourByteTag('c', 'i', 'c', 'p');
+static constexpr uint32_t kTAG_cprt = SetFourByteTag('c', 'p', 'r', 't');
+static constexpr uint32_t kTAG_A2B0 = SetFourByteTag('A', '2', 'B', '0');
+static constexpr uint32_t kTAG_B2A0 = SetFourByteTag('B', '2', 'A', '0');
+
+static constexpr uint32_t kTAG_CurveType = SetFourByteTag('c', 'u', 'r', 'v');
+static constexpr uint32_t kTAG_mABType = SetFourByteTag('m', 'A', 'B', ' ');
+static constexpr uint32_t kTAG_mBAType = SetFourByteTag('m', 'B', 'A', ' ');
+static constexpr uint32_t kTAG_ParaCurveType = SetFourByteTag('p', 'a', 'r', 'a');
+
+static constexpr Matrix3x3 kSRGB = {{
+ // ICC fixed-point (16.16) representation, taken from skcms. Please keep them exactly in sync.
+ // 0.436065674f, 0.385147095f, 0.143066406f,
+ // 0.222488403f, 0.716873169f, 0.060607910f,
+ // 0.013916016f, 0.097076416f, 0.714096069f,
+ {FixedToFloat(0x6FA2), FixedToFloat(0x6299), FixedToFloat(0x24A0)},
+ {FixedToFloat(0x38F5), FixedToFloat(0xB785), FixedToFloat(0x0F84)},
+ {FixedToFloat(0x0390), FixedToFloat(0x18DA), FixedToFloat(0xB6CF)},
+}};
+
+static constexpr Matrix3x3 kDisplayP3 = {{
+ {0.515102f, 0.291965f, 0.157153f},
+ {0.241182f, 0.692236f, 0.0665819f},
+ {-0.00104941f, 0.0418818f, 0.784378f},
+}};
+
+static constexpr Matrix3x3 kRec2020 = {{
+ {0.673459f, 0.165661f, 0.125100f},
+ {0.279033f, 0.675338f, 0.0456288f},
+ {-0.00193139f, 0.0299794f, 0.797162f},
+}};
+
+static constexpr uint32_t kCICPPrimariesSRGB = 1;
+static constexpr uint32_t kCICPPrimariesP3 = 12;
+static constexpr uint32_t kCICPPrimariesRec2020 = 9;
+
+static constexpr uint32_t kCICPTrfnSRGB = 1;
+static constexpr uint32_t kCICPTrfnLinear = 8;
+static constexpr uint32_t kCICPTrfnPQ = 16;
+static constexpr uint32_t kCICPTrfnHLG = 18;
+
+enum ParaCurveType {
+ kExponential_ParaCurveType = 0,
+ kGAB_ParaCurveType = 1,
+ kGABC_ParaCurveType = 2,
+ kGABDE_ParaCurveType = 3,
+ kGABCDEF_ParaCurveType = 4,
+};
+
+/**
+ * Return the closest int for the given float. Returns MaxS32FitsInFloat for NaN.
+ */
+static inline int float_saturate2int(float x) {
+ x = x < MaxS32FitsInFloat ? x : MaxS32FitsInFloat;
+ x = x > MinS32FitsInFloat ? x : MinS32FitsInFloat;
+ return (int)x;
+}
+
+static Fixed float_round_to_fixed(float x) {
+ return float_saturate2int((float)floor((double)x * Fixed1 + 0.5));
+}
+
+static uint16_t float_round_to_unorm16(float x) {
+ x = x * 65535.f + 0.5;
+ if (x > 65535) return 65535;
+ if (x < 0) return 0;
+ return static_cast<uint16_t>(x);
+}
+
+static inline void float_to_table16(const float f, uint8_t* table_16) {
+ *reinterpret_cast<uint16_t*>(table_16) = Endian_SwapBE16(float_round_to_unorm16(f));
+}
+
+static inline bool isfinitef_(float x) { return 0 == x * 0; }
+
+struct ICCHeader {
+ // Size of the profile (computed)
+ uint32_t size;
+ // Preferred CMM type (ignored)
+ uint32_t cmm_type = 0;
+ // Version 4.3 or 4.4 if CICP is included.
+ uint32_t version = Endian_SwapBE32(0x04300000);
+ // Display device profile
+ uint32_t profile_class = Endian_SwapBE32(kDisplay_Profile);
+ // RGB input color space;
+ uint32_t data_color_space = Endian_SwapBE32(kRGB_ColorSpace);
+ // Profile connection space.
+ uint32_t pcs = Endian_SwapBE32(kXYZ_PCSSpace);
+ // Date and time (ignored)
+ uint8_t creation_date_time[12] = {0};
+ // Profile signature
+ uint32_t signature = Endian_SwapBE32(kACSP_Signature);
+ // Platform target (ignored)
+ uint32_t platform = 0;
+ // Flags: not embedded, can be used independently
+ uint32_t flags = 0x00000000;
+ // Device manufacturer (ignored)
+ uint32_t device_manufacturer = 0;
+ // Device model (ignored)
+ uint32_t device_model = 0;
+ // Device attributes (ignored)
+ uint8_t device_attributes[8] = {0};
+ // Relative colorimetric rendering intent
+ uint32_t rendering_intent = Endian_SwapBE32(1);
+ // D50 standard illuminant (X, Y, Z)
+ uint32_t illuminant_X = Endian_SwapBE32(float_round_to_fixed(kD50_x));
+ uint32_t illuminant_Y = Endian_SwapBE32(float_round_to_fixed(kD50_y));
+ uint32_t illuminant_Z = Endian_SwapBE32(float_round_to_fixed(kD50_z));
+ // Profile creator (ignored)
+ uint32_t creator = 0;
+ // Profile id checksum (ignored)
+ uint8_t profile_id[16] = {0};
+ // Reserved (ignored)
+ uint8_t reserved[28] = {0};
+ // Technically not part of header, but required
+ uint32_t tag_count = 0;
+};
+
+class IccHelper {
+ private:
+ static constexpr uint32_t kTrcTableSize = 65;
+ static constexpr uint32_t kGridSize = 17;
+ static constexpr size_t kNumChannels = 3;
+
+ static std::shared_ptr<DataStruct> write_text_tag(const char* text);
+ static std::string get_desc_string(const ultrahdr_transfer_function tf,
+ const ultrahdr_color_gamut gamut);
+ static std::shared_ptr<DataStruct> write_xyz_tag(float x, float y, float z);
+ static std::shared_ptr<DataStruct> write_trc_tag(const int table_entries, const void* table_16);
+ static std::shared_ptr<DataStruct> write_trc_tag(const TransferFunction& fn);
+ static float compute_tone_map_gain(const ultrahdr_transfer_function tf, float L);
+ static std::shared_ptr<DataStruct> write_cicp_tag(uint32_t color_primaries,
+ uint32_t transfer_characteristics);
+ static std::shared_ptr<DataStruct> write_mAB_or_mBA_tag(uint32_t type, bool has_a_curves,
+ const uint8_t* grid_points,
+ const uint8_t* grid_16);
+ static void compute_lut_entry(const Matrix3x3& src_to_XYZD50, float rgb[3]);
+ static std::shared_ptr<DataStruct> write_clut(const uint8_t* grid_points, const uint8_t* grid_16);
+
+ // Checks if a set of xyz tags is equivalent to a 3x3 Matrix. Each input
+ // tag buffer assumed to be at least kColorantTagSize in size.
+ static bool tagsEqualToMatrix(const Matrix3x3& matrix, const uint8_t* red_tag,
+ const uint8_t* green_tag, const uint8_t* blue_tag);
+
+ public:
+ // Output includes JPEG embedding identifier and chunk information, but not
+ // APPx information.
+ static std::shared_ptr<DataStruct> writeIccProfile(const ultrahdr_transfer_function tf,
+ const ultrahdr_color_gamut gamut);
+ // NOTE: this function is not robust; it can infer gamuts that IccHelper
+ // writes out but should not be considered a reference implementation for
+ // robust parsing of ICC profiles or their gamuts.
+ static ultrahdr_color_gamut readIccColorGamut(void* icc_data, size_t icc_size);
+};
+} // namespace ultrahdr
+
+#endif // ULTRAHDR_ICC_H
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