// Copyright 2014 PDFium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com #include "core/fxcodec/fx_codec.h" #include #include #include #include #include #include "core/fxcodec/codec/ccodec_basicmodule.h" #include "core/fxcodec/codec/ccodec_faxmodule.h" #include "core/fxcodec/codec/ccodec_flatemodule.h" #include "core/fxcodec/codec/ccodec_iccmodule.h" #include "core/fxcodec/codec/ccodec_jbig2module.h" #include "core/fxcodec/codec/ccodec_jpegmodule.h" #include "core/fxcodec/codec/ccodec_jpxmodule.h" #include "core/fxcodec/codec/ccodec_scanlinedecoder.h" #include "core/fxcodec/codec/codec_int.h" #include "core/fxcrt/fx_extension.h" #include "core/fxcrt/fx_safe_types.h" #include "third_party/base/logging.h" #include "third_party/base/ptr_util.h" namespace { const uint8_t g_CMYK[81 * 81 * 3] = { 255, 255, 255, 225, 226, 228, 199, 200, 202, 173, 174, 178, 147, 149, 152, 123, 125, 128, 99, 99, 102, 69, 70, 71, 34, 30, 31, 255, 253, 229, 226, 224, 203, 200, 199, 182, 173, 173, 158, 149, 148, 135, 125, 124, 113, 99, 99, 90, 70, 69, 63, 33, 29, 24, 255, 251, 204, 228, 223, 182, 201, 198, 163, 174, 172, 142, 150, 147, 122, 125, 123, 101, 99, 98, 80, 70, 68, 54, 32, 28, 16, 255, 249, 179, 230, 222, 160, 203, 197, 144, 174, 170, 124, 150, 145, 105, 125, 122, 88, 99, 97, 69, 70, 68, 46, 31, 28, 6, 255, 247, 154, 229, 220, 138, 203, 195, 122, 176, 169, 107, 150, 145, 91, 125, 121, 74, 100, 96, 57, 70, 67, 35, 29, 26, 0, 255, 246, 128, 231, 217, 114, 205, 194, 101, 176, 167, 88, 150, 144, 75, 125, 120, 60, 100, 96, 44, 70, 66, 24, 28, 26, 0, 255, 244, 96, 231, 217, 87, 203, 192, 78, 175, 167, 66, 150, 143, 56, 125, 119, 43, 100, 95, 29, 69, 66, 7, 26, 26, 0, 255, 243, 51, 232, 215, 51, 204, 191, 43, 176, 165, 38, 150, 142, 28, 125, 118, 17, 99, 94, 0, 68, 65, 0, 24, 25, 0, 255, 241, 0, 231, 215, 0, 203, 190, 0, 176, 164, 0, 150, 141, 0, 126, 117, 0, 99, 93, 0, 68, 65, 0, 24, 25, 0, 252, 228, 238, 222, 201, 211, 197, 180, 190, 171, 156, 166, 147, 133, 143, 123, 111, 119, 99, 88, 94, 71, 61, 66, 34, 22, 26, 254, 226, 213, 224, 201, 191, 199, 179, 171, 172, 155, 148, 147, 133, 128, 123, 110, 106, 98, 87, 83, 70, 59, 57, 33, 21, 18, 254, 224, 191, 224, 199, 172, 200, 177, 153, 173, 154, 133, 147, 132, 115, 123, 109, 94, 98, 86, 74, 70, 59, 49, 32, 21, 9, 255, 222, 168, 227, 198, 150, 200, 175, 135, 173, 153, 118, 148, 130, 99, 123, 109, 82, 98, 86, 64, 69, 58, 40, 31, 19, 0, 255, 221, 145, 227, 196, 129, 201, 174, 115, 173, 151, 99, 148, 129, 85, 124, 108, 69, 98, 85, 52, 69, 58, 30, 30, 19, 0, 255, 219, 121, 227, 195, 109, 201, 174, 97, 174, 150, 83, 148, 129, 70, 124, 107, 55, 98, 84, 40, 69, 58, 19, 28, 18, 0, 255, 218, 92, 229, 194, 82, 202, 173, 75, 174, 150, 63, 149, 128, 51, 124, 106, 39, 98, 84, 24, 68, 57, 3, 26, 18, 0, 255, 217, 54, 228, 193, 52, 201, 172, 46, 174, 148, 36, 148, 127, 27, 123, 105, 14, 98, 83, 0, 68, 56, 0, 25, 18, 0, 255, 216, 0, 229, 192, 2, 202, 171, 4, 173, 148, 0, 148, 126, 0, 124, 105, 0, 98, 83, 0, 68, 56, 0, 24, 17, 0, 249, 204, 223, 219, 181, 199, 195, 160, 178, 170, 140, 156, 146, 119, 134, 123, 99, 112, 98, 77, 88, 70, 52, 61, 34, 11, 20, 250, 201, 200, 221, 180, 178, 197, 159, 161, 171, 139, 139, 147, 119, 120, 123, 98, 99, 98, 77, 78, 69, 51, 52, 34, 11, 10, 252, 201, 180, 223, 179, 162, 197, 159, 144, 170, 138, 125, 146, 117, 107, 122, 97, 89, 98, 76, 69, 69, 50, 44, 32, 11, 2, 252, 199, 158, 222, 177, 143, 199, 158, 127, 171, 137, 110, 147, 117, 93, 122, 96, 76, 97, 75, 58, 69, 50, 36, 32, 10, 0, 253, 198, 137, 223, 177, 123, 198, 156, 110, 171, 136, 95, 146, 116, 80, 122, 96, 65, 97, 75, 47, 69, 50, 25, 30, 10, 0, 254, 197, 115, 225, 175, 104, 198, 156, 92, 172, 135, 79, 147, 115, 66, 123, 95, 52, 98, 74, 37, 69, 49, 15, 29, 10, 0, 254, 196, 89, 224, 175, 80, 199, 154, 70, 172, 134, 59, 146, 114, 48, 122, 95, 36, 97, 74, 21, 68, 49, 0, 27, 9, 0, 255, 195, 57, 225, 173, 52, 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82, 33, 97, 63, 17, 68, 40, 0, 28, 0, 0, 251, 171, 58, 222, 152, 50, 197, 135, 43, 169, 117, 34, 146, 99, 25, 121, 81, 10, 96, 63, 0, 68, 40, 0, 27, 0, 0, 250, 170, 26, 222, 151, 19, 196, 134, 13, 169, 116, 4, 145, 99, 0, 122, 81, 0, 97, 63, 0, 67, 40, 0, 26, 0, 0, 244, 153, 194, 215, 136, 173, 192, 121, 155, 167, 104, 135, 143, 89, 115, 121, 72, 96, 97, 54, 75, 70, 31, 49, 34, 0, 6, 245, 153, 173, 216, 136, 155, 192, 120, 138, 167, 104, 121, 144, 88, 103, 121, 71, 85, 97, 54, 66, 69, 31, 42, 34, 0, 0, 246, 152, 157, 217, 135, 140, 193, 120, 126, 167, 103, 109, 143, 88, 92, 121, 72, 76, 97, 54, 58, 69, 31, 35, 33, 0, 0, 245, 150, 139, 218, 134, 125, 193, 119, 111, 167, 103, 96, 144, 87, 80, 121, 71, 66, 96, 53, 49, 68, 31, 26, 32, 0, 0, 246, 151, 122, 218, 133, 108, 194, 118, 96, 168, 102, 81, 144, 86, 69, 120, 71, 55, 95, 53, 39, 68, 30, 17, 31, 0, 0, 248, 150, 103, 218, 133, 91, 193, 118, 81, 168, 102, 69, 143, 86, 56, 120, 70, 43, 96, 53, 28, 68, 31, 6, 29, 0, 0, 247, 149, 81, 218, 132, 72, 194, 117, 62, 168, 101, 52, 144, 86, 42, 121, 70, 29, 96, 52, 13, 68, 30, 0, 28, 0, 0, 247, 148, 55, 219, 131, 50, 194, 117, 43, 167, 101, 32, 144, 85, 22, 120, 69, 8, 96, 52, 0, 67, 30, 0, 27, 0, 0, 247, 147, 29, 218, 131, 24, 194, 116, 20, 168, 100, 11, 144, 85, 0, 120, 69, 0, 96, 52, 0, 67, 30, 0, 26, 0, 0, 242, 130, 179, 214, 114, 160, 190, 101, 143, 166, 87, 125, 143, 72, 107, 120, 58, 88, 96, 42, 68, 69, 17, 44, 35, 0, 0, 243, 129, 161, 215, 114, 143, 191, 101, 128, 166, 87, 113, 143, 73, 96, 120, 58, 79, 96, 41, 60, 69, 18, 37, 33, 0, 0, 243, 129, 146, 216, 114, 130, 192, 101, 117, 166, 87, 101, 143, 72, 86, 121, 58, 69, 96, 42, 52, 69, 18, 29, 31, 0, 0, 243, 128, 130, 216, 114, 115, 191, 101, 102, 165, 86, 88, 142, 72, 75, 120, 58, 60, 95, 42, 43, 68, 19, 21, 30, 0, 0, 244, 127, 112, 217, 113, 101, 192, 99, 89, 166, 85, 75, 142, 72, 63, 119, 57, 50, 96, 41, 35, 68, 19, 13, 30, 0, 0, 244, 127, 96, 216, 112, 86, 191, 99, 75, 166, 86, 64, 143, 72, 52, 120, 57, 40, 95, 41, 24, 67, 20, 1, 29, 0, 0, 245, 126, 77, 216, 113, 68, 191, 100, 59, 166, 85, 49, 142, 71, 38, 119, 57, 26, 95, 41, 10, 67, 20, 0, 28, 0, 0, 244, 126, 55, 216, 112, 48, 191, 99, 40, 166, 85, 31, 143, 71, 20, 119, 57, 6, 95, 42, 0, 67, 20, 0, 28, 0, 0, 245, 126, 33, 217, 112, 26, 192, 99, 22, 166, 84, 11, 142, 70, 0, 119, 57, 0, 95, 41, 0, 66, 20, 0, 27, 0, 0, 241, 102, 167, 213, 90, 149, 189, 79, 133, 165, 66, 115, 141, 54, 98, 119, 41, 81, 96, 25, 63, 69, 0, 38, 30, 0, 0, 241, 102, 149, 213, 90, 133, 189, 79, 119, 165, 66, 103, 142, 55, 88, 119, 41, 71, 96, 25, 53, 69, 0, 31, 28, 0, 0, 241, 102, 135, 214, 90, 121, 190, 79, 108, 165, 66, 92, 141, 55, 78, 119, 42, 63, 96, 26, 46, 69, 0, 24, 28, 0, 0, 241, 101, 120, 214, 90, 107, 189, 79, 95, 165, 67, 83, 141, 54, 68, 118, 41, 54, 95, 27, 39, 68, 0, 16, 27, 0, 0, 241, 102, 106, 213, 90, 93, 189, 78, 82, 164, 67, 70, 141, 55, 58, 118, 42, 45, 94, 27, 29, 67, 2, 6, 27, 0, 0, 242, 101, 90, 214, 89, 79, 190, 79, 69, 166, 67, 59, 141, 55, 47, 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47, 0, 4, 32, 0, 0, 10, 0, 0, 0, 42, 69, 95, 36, 59, 84, 29, 51, 74, 19, 41, 63, 10, 31, 52, 0, 20, 39, 0, 4, 25, 0, 0, 4, 0, 0, 0, 43, 69, 83, 38, 60, 73, 32, 51, 62, 23, 42, 53, 11, 31, 42, 0, 20, 31, 0, 5, 17, 0, 0, 1, 0, 0, 0, 45, 69, 70, 39, 60, 60, 33, 51, 52, 24, 42, 43, 13, 32, 33, 0, 21, 21, 0, 5, 6, 0, 0, 0, 0, 0, 0, 47, 69, 59, 41, 60, 51, 34, 51, 43, 24, 42, 35, 12, 33, 26, 1, 22, 14, 0, 5, 1, 0, 0, 0, 0, 0, 0, 46, 48, 146, 42, 40, 131, 36, 32, 118, 27, 22, 103, 17, 6, 88, 5, 0, 73, 0, 0, 55, 0, 0, 33, 0, 0, 0, 48, 48, 133, 44, 40, 119, 37, 32, 107, 28, 22, 93, 20, 8, 79, 7, 0, 65, 0, 0, 49, 0, 0, 27, 0, 0, 0, 48, 50, 123, 44, 41, 109, 37, 33, 97, 30, 23, 83, 21, 11, 71, 8, 0, 58, 0, 0, 42, 0, 0, 21, 0, 0, 0, 49, 51, 111, 45, 42, 99, 38, 34, 87, 29, 25, 75, 20, 13, 63, 8, 0, 51, 0, 0, 36, 0, 0, 14, 0, 0, 0, 52, 52, 100, 44, 43, 89, 38, 35, 79, 29, 26, 68, 19, 15, 56, 10, 1, 43, 0, 0, 28, 0, 0, 6, 0, 0, 0, 52, 52, 90, 47, 44, 79, 39, 36, 70, 30, 27, 59, 20, 16, 47, 9, 2, 36, 0, 0, 22, 0, 0, 2, 0, 0, 0, 52, 53, 78, 46, 44, 68, 39, 37, 60, 32, 27, 49, 22, 17, 39, 10, 3, 28, 0, 0, 12, 0, 0, 0, 0, 0, 0, 53, 53, 66, 47, 44, 57, 40, 36, 48, 32, 27, 39, 22, 18, 30, 9, 4, 18, 0, 0, 3, 0, 0, 0, 0, 0, 0, 54, 53, 57, 48, 45, 49, 41, 37, 41, 33, 28, 32, 22, 19, 23, 11, 6, 10, 1, 0, 0, 0, 0, 0, 0, 0, 0, }; } // namespace CCodec_ModuleMgr::CCodec_ModuleMgr() : m_pBasicModule(pdfium::MakeUnique()), m_pFaxModule(pdfium::MakeUnique()), m_pJpegModule(pdfium::MakeUnique()), m_pJpxModule(pdfium::MakeUnique()), m_pJbig2Module(pdfium::MakeUnique()), m_pIccModule(pdfium::MakeUnique()), m_pFlateModule(pdfium::MakeUnique()) {} CCodec_ModuleMgr::~CCodec_ModuleMgr() {} bool CCodec_BasicModule::RunLengthEncode(pdfium::span src_span, uint8_t** dest_buf, uint32_t* dest_size) { // Check inputs if (src_span.empty() || !dest_buf || !dest_size) return false; // Edge case if (src_span.size() == 1) { *dest_buf = FX_Alloc(uint8_t, 3); (*dest_buf)[0] = 0; (*dest_buf)[1] = src_span[0]; (*dest_buf)[2] = 128; *dest_size = 3; return true; } // Worst case: 1 nonmatch, 2 match, 1 nonmatch, 2 match, etc. This becomes // 4 output chars for every 3 input, plus up to 4 more for the 1-2 chars // rounded off plus the terminating character. FX_SAFE_SIZE_T estimated_size = src_span.size(); estimated_size += 2; estimated_size /= 3; estimated_size *= 4; estimated_size += 1; *dest_buf = FX_Alloc(uint8_t, estimated_size.ValueOrDie()); // Set up pointers. uint8_t* out = *dest_buf; uint32_t run_start = 0; uint32_t run_end = 1; uint8_t x = src_span[run_start]; uint8_t y = src_span[run_end]; while (run_end < src_span.size()) { size_t max_len = std::min(128, src_span.size() - run_start); while (x == y && (run_end - run_start < max_len - 1)) y = src_span[++run_end]; // Reached end with matched run. Update variables to expected values. if (x == y) { run_end++; if (run_end < src_span.size()) y = src_span[run_end]; } if (run_end - run_start > 1) { // Matched run but not at end of input. out[0] = 257 - (run_end - run_start); out[1] = x; x = y; run_start = run_end; run_end++; if (run_end < src_span.size()) y = src_span[run_end]; out += 2; continue; } // Mismatched run while (x != y && run_end <= run_start + max_len) { out[run_end - run_start] = x; x = y; run_end++; if (run_end == src_span.size()) { if (run_end <= run_start + max_len) { out[run_end - run_start] = x; run_end++; } break; } y = src_span[run_end]; } out[0] = run_end - run_start - 2; out += run_end - run_start; run_start = run_end - 1; } if (run_start < src_span.size()) { // 1 leftover character out[0] = 0; out[1] = x; out += 2; } *out = 128; *dest_size = out + 1 - *dest_buf; return true; } bool CCodec_BasicModule::A85Encode(pdfium::span src_span, uint8_t** dest_buf, uint32_t* dest_size) { // Check inputs. if (!dest_buf || !dest_size) return false; if (src_span.empty()) { *dest_size = 0; return false; } // Worst case: 5 output for each 4 input (plus up to 4 from leftover), plus // 2 character new lines each 75 output chars plus 2 termination chars. May // have fewer if there are special "z" chars. FX_SAFE_SIZE_T estimated_size = src_span.size(); estimated_size /= 4; estimated_size *= 5; estimated_size += 4; estimated_size += src_span.size() / 30; estimated_size += 2; *dest_buf = FX_Alloc(uint8_t, estimated_size.ValueOrDie()); // Set up pointers. uint8_t* out = *dest_buf; uint32_t pos = 0; uint32_t line_length = 0; while (src_span.size() >= 4 && pos < src_span.size() - 3) { uint32_t val = ((uint32_t)(src_span[pos]) << 24) + ((uint32_t)(src_span[pos + 1]) << 16) + ((uint32_t)(src_span[pos + 2]) << 8) + (uint32_t)(src_span[pos + 3]); pos += 4; if (val == 0) { // All zero special case *out = 'z'; out++; line_length++; } else { // Compute base 85 characters and add 33. for (int i = 4; i >= 0; i--) { out[i] = (uint8_t)(val % 85) + 33; val = val / 85; } out += 5; line_length += 5; } if (line_length >= 75) { // Add a return. *out++ = '\r'; *out++ = '\n'; line_length = 0; } } if (pos < src_span.size()) { // Leftover bytes uint32_t val = 0; int count = 0; while (pos < src_span.size()) { val += (uint32_t)(src_span[pos]) << (8 * (3 - count)); count++; pos++; } for (int i = 4; i >= 0; i--) { if (i <= count) out[i] = (uint8_t)(val % 85) + 33; val = val / 85; } out += count + 1; } // Terminating characters. out[0] = '~'; out[1] = '>'; out += 2; *dest_size = out - *dest_buf; return true; } #ifdef PDF_ENABLE_XFA CFX_DIBAttribute::CFX_DIBAttribute() {} CFX_DIBAttribute::~CFX_DIBAttribute() { for (const auto& pair : m_Exif) FX_Free(pair.second); } #endif // PDF_ENABLE_XFA class CCodec_RLScanlineDecoder final : public CCodec_ScanlineDecoder { public: CCodec_RLScanlineDecoder(); ~CCodec_RLScanlineDecoder() override; bool Create(pdfium::span src_buf, int width, int height, int nComps, int bpc); // CCodec_ScanlineDecoder bool v_Rewind() override; uint8_t* v_GetNextLine() override; uint32_t GetSrcOffset() override { return m_SrcOffset; } protected: bool CheckDestSize(); void GetNextOperator(); void UpdateOperator(uint8_t used_bytes); std::unique_ptr m_pScanline; pdfium::span m_SrcBuf; size_t m_dwLineBytes = 0; size_t m_SrcOffset = 0; bool m_bEOD = false; uint8_t m_Operator = 0; }; CCodec_RLScanlineDecoder::CCodec_RLScanlineDecoder() = default; CCodec_RLScanlineDecoder::~CCodec_RLScanlineDecoder() = default; bool CCodec_RLScanlineDecoder::CheckDestSize() { size_t i = 0; uint32_t old_size = 0; uint32_t dest_size = 0; while (i < m_SrcBuf.size()) { if (m_SrcBuf[i] < 128) { old_size = dest_size; dest_size += m_SrcBuf[i] + 1; if (dest_size < old_size) { return false; } i += m_SrcBuf[i] + 2; } else if (m_SrcBuf[i] > 128) { old_size = dest_size; dest_size += 257 - m_SrcBuf[i]; if (dest_size < old_size) { return false; } i += 2; } else { break; } } if (((uint32_t)m_OrigWidth * m_nComps * m_bpc * m_OrigHeight + 7) / 8 > dest_size) { return false; } return true; } bool CCodec_RLScanlineDecoder::Create(pdfium::span src_buf, int width, int height, int nComps, int bpc) { m_SrcBuf = src_buf; m_OutputWidth = m_OrigWidth = width; m_OutputHeight = m_OrigHeight = height; m_nComps = nComps; m_bpc = bpc; // Aligning the pitch to 4 bytes requires an integer overflow check. FX_SAFE_UINT32 pitch = width; pitch *= nComps; pitch *= bpc; pitch += 31; pitch /= 32; pitch *= 4; if (!pitch.IsValid()) { return false; } m_Pitch = pitch.ValueOrDie(); // Overflow should already have been checked before this is called. m_dwLineBytes = (static_cast(width) * nComps * bpc + 7) / 8; m_pScanline.reset(FX_Alloc(uint8_t, m_Pitch)); return CheckDestSize(); } bool CCodec_RLScanlineDecoder::v_Rewind() { memset(m_pScanline.get(), 0, m_Pitch); m_SrcOffset = 0; m_bEOD = false; m_Operator = 0; return true; } uint8_t* CCodec_RLScanlineDecoder::v_GetNextLine() { if (m_SrcOffset == 0) { GetNextOperator(); } else if (m_bEOD) { return nullptr; } memset(m_pScanline.get(), 0, m_Pitch); uint32_t col_pos = 0; bool eol = false; while (m_SrcOffset < m_SrcBuf.size() && !eol) { if (m_Operator < 128) { uint32_t copy_len = m_Operator + 1; if (col_pos + copy_len >= m_dwLineBytes) { copy_len = m_dwLineBytes - col_pos; eol = true; } if (copy_len >= m_SrcBuf.size() - m_SrcOffset) { copy_len = m_SrcBuf.size() - m_SrcOffset; m_bEOD = true; } memcpy(m_pScanline.get() + col_pos, &m_SrcBuf[m_SrcOffset], copy_len); col_pos += copy_len; UpdateOperator((uint8_t)copy_len); } else if (m_Operator > 128) { int fill = 0; if (m_SrcOffset - 1 < m_SrcBuf.size() - 1) { fill = m_SrcBuf[m_SrcOffset]; } uint32_t duplicate_len = 257 - m_Operator; if (col_pos + duplicate_len >= m_dwLineBytes) { duplicate_len = m_dwLineBytes - col_pos; eol = true; } memset(m_pScanline.get() + col_pos, fill, duplicate_len); col_pos += duplicate_len; UpdateOperator((uint8_t)duplicate_len); } else { m_bEOD = true; break; } } return m_pScanline.get(); } void CCodec_RLScanlineDecoder::GetNextOperator() { if (m_SrcOffset >= m_SrcBuf.size()) { m_Operator = 128; return; } m_Operator = m_SrcBuf[m_SrcOffset]; m_SrcOffset++; } void CCodec_RLScanlineDecoder::UpdateOperator(uint8_t used_bytes) { if (used_bytes == 0) { return; } if (m_Operator < 128) { ASSERT((uint32_t)m_Operator + 1 >= used_bytes); if (used_bytes == m_Operator + 1) { m_SrcOffset += used_bytes; GetNextOperator(); return; } m_Operator -= used_bytes; m_SrcOffset += used_bytes; if (m_SrcOffset >= m_SrcBuf.size()) { m_Operator = 128; } return; } uint8_t count = 257 - m_Operator; ASSERT((uint32_t)count >= used_bytes); if (used_bytes == count) { m_SrcOffset++; GetNextOperator(); return; } count -= used_bytes; m_Operator = 257 - count; } std::unique_ptr CCodec_BasicModule::CreateRunLengthDecoder(pdfium::span src_buf, int width, int height, int nComps, int bpc) { auto pDecoder = pdfium::MakeUnique(); if (!pDecoder->Create(src_buf, width, height, nComps, bpc)) return nullptr; return std::move(pDecoder); } std::tuple AdobeCMYK_to_sRGB1(uint8_t c, uint8_t m, uint8_t y, uint8_t k) { int fix_c = c << 8; int fix_m = m << 8; int fix_y = y << 8; int fix_k = k << 8; int c_index = (fix_c + 4096) >> 13; int m_index = (fix_m + 4096) >> 13; int y_index = (fix_y + 4096) >> 13; int k_index = (fix_k + 4096) >> 13; int pos = (c_index * 9 * 9 * 9 + m_index * 9 * 9 + y_index * 9 + k_index) * 3; int fix_r = g_CMYK[pos] << 8; int fix_g = g_CMYK[pos + 1] << 8; int fix_b = g_CMYK[pos + 2] << 8; int c1_index = fix_c >> 13; if (c1_index == c_index) c1_index = c1_index == 8 ? c1_index - 1 : c1_index + 1; int m1_index = fix_m >> 13; if (m1_index == m_index) m1_index = m1_index == 8 ? m1_index - 1 : m1_index + 1; int y1_index = fix_y >> 13; if (y1_index == y_index) y1_index = y1_index == 8 ? y1_index - 1 : y1_index + 1; int k1_index = fix_k >> 13; if (k1_index == k_index) k1_index = k1_index == 8 ? k1_index - 1 : k1_index + 1; int c1_pos = pos + (c1_index - c_index) * 9 * 9 * 9 * 3; int m1_pos = pos + (m1_index - m_index) * 9 * 9 * 3; int y1_pos = pos + (y1_index - y_index) * 9 * 3; int k1_pos = pos + (k1_index - k_index) * 3; int c_rate = (fix_c - (c_index << 13)) * (c_index - c1_index); fix_r += (g_CMYK[pos] - g_CMYK[c1_pos]) * c_rate / 32; fix_g += (g_CMYK[pos + 1] - g_CMYK[c1_pos + 1]) * c_rate / 32; fix_b += (g_CMYK[pos + 2] - g_CMYK[c1_pos + 2]) * c_rate / 32; int m_rate = (fix_m - (m_index << 13)) * (m_index - m1_index); fix_r += (g_CMYK[pos] - g_CMYK[m1_pos]) * m_rate / 32; fix_g += (g_CMYK[pos + 1] - g_CMYK[m1_pos + 1]) * m_rate / 32; fix_b += (g_CMYK[pos + 2] - g_CMYK[m1_pos + 2]) * m_rate / 32; int y_rate = (fix_y - (y_index << 13)) * (y_index - y1_index); fix_r += (g_CMYK[pos] - g_CMYK[y1_pos]) * y_rate / 32; fix_g += (g_CMYK[pos + 1] - g_CMYK[y1_pos + 1]) * y_rate / 32; fix_b += (g_CMYK[pos + 2] - g_CMYK[y1_pos + 2]) * y_rate / 32; int k_rate = (fix_k - (k_index << 13)) * (k_index - k1_index); fix_r += (g_CMYK[pos] - g_CMYK[k1_pos]) * k_rate / 32; fix_g += (g_CMYK[pos + 1] - g_CMYK[k1_pos + 1]) * k_rate / 32; fix_b += (g_CMYK[pos + 2] - g_CMYK[k1_pos + 2]) * k_rate / 32; fix_r = std::max(fix_r, 0); fix_g = std::max(fix_g, 0); fix_b = std::max(fix_b, 0); return std::make_tuple(fix_r >> 8, fix_g >> 8, fix_b >> 8); } std::tuple AdobeCMYK_to_sRGB(float c, float m, float y, float k) { // Convert to uint8_t with round-to-nearest. Avoid using FXSYS_round because // it is incredibly expensive with VC++ (tested on VC++ 2015) because round() // is very expensive. // The 'magic' value of 0.49999997f, the float that precedes 0.5f, was chosen // because it gives identical results to FXSYS_round(). Using the constant // 0.5f gives different results (1 instead of 0) for one value, 0.0019607842. // That value is close to the cusp but zero is the correct answer, and // getting the same answer as before is desirable. // All floats from 0.0 to 1.0 were tested and now give the same results. const float rounding_offset = 0.49999997f; uint8_t c1 = int(c * 255.f + rounding_offset); uint8_t m1 = int(m * 255.f + rounding_offset); uint8_t y1 = int(y * 255.f + rounding_offset); uint8_t k1 = int(k * 255.f + rounding_offset); ASSERT(c1 == FXSYS_round(c * 255)); ASSERT(m1 == FXSYS_round(m * 255)); ASSERT(y1 == FXSYS_round(y * 255)); ASSERT(k1 == FXSYS_round(k * 255)); uint8_t r; uint8_t g; uint8_t b; std::tie(r, g, b) = AdobeCMYK_to_sRGB1(c1, m1, y1, k1); // Multiply by a constant rather than dividing because division is much // more expensive. return std::make_tuple(r * (1.0f / 255), g * (1.0f / 255), b * (1.0f / 255)); } FX_SAFE_UINT32 CalculatePitch8(uint32_t bpc, uint32_t components, int width) { FX_SAFE_UINT32 pitch = bpc; pitch *= components; pitch *= width; pitch += 7; pitch /= 8; return pitch; } FX_SAFE_UINT32 CalculatePitch32(int bpp, int width) { FX_SAFE_UINT32 pitch = bpp; pitch *= width; pitch += 31; pitch /= 32; // quantized to number of 32-bit words. pitch *= 4; // and then back to bytes, (not just /8 in one step). return pitch; }