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// Copyright (c) the JPEG XL Project Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#ifndef LIB_JPEGLI_COMMON_INTERNAL_H_
#define LIB_JPEGLI_COMMON_INTERNAL_H_
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <algorithm>
#include <hwy/aligned_allocator.h>
#include "lib/jpegli/memory_manager.h"
#include "lib/jpegli/simd.h"
#include "lib/jxl/base/compiler_specific.h" // for ssize_t
#include "lib/jxl/base/status.h" // for JXL_CHECK
namespace jpegli {
enum State {
kDecNull,
kDecStart,
kDecInHeader,
kDecHeaderDone,
kDecProcessMarkers,
kDecProcessScan,
kEncNull,
kEncStart,
kEncHeader,
kEncReadImage,
kEncWriteCoeffs,
};
template <typename T1, typename T2>
constexpr inline T1 DivCeil(T1 a, T2 b) {
return (a + b - 1) / b;
}
template <typename T1, typename T2>
constexpr inline T1 RoundUpTo(T1 a, T2 b) {
return DivCeil(a, b) * b;
}
constexpr size_t kDCTBlockSize = 64;
// This is set to the same value as MAX_COMPS_IN_SCAN, because that is the
// maximum number of channels the libjpeg-turbo decoder can decode.
constexpr int kMaxComponents = 4;
constexpr int kMaxQuantTables = 4;
constexpr int kJpegPrecision = 8;
constexpr int kMaxHuffmanTables = 4;
constexpr size_t kJpegHuffmanMaxBitLength = 16;
constexpr int kJpegHuffmanAlphabetSize = 256;
constexpr int kJpegDCAlphabetSize = 12;
constexpr int kMaxDHTMarkers = 512;
constexpr int kMaxDimPixels = 65535;
constexpr uint8_t kApp1 = 0xE1;
constexpr uint8_t kApp2 = 0xE2;
const uint8_t kIccProfileTag[12] = "ICC_PROFILE";
const uint8_t kExifTag[6] = "Exif\0";
const uint8_t kXMPTag[29] = "http://ns.adobe.com/xap/1.0/";
/* clang-format off */
constexpr uint32_t kJPEGNaturalOrder[80] = {
0, 1, 8, 16, 9, 2, 3, 10,
17, 24, 32, 25, 18, 11, 4, 5,
12, 19, 26, 33, 40, 48, 41, 34,
27, 20, 13, 6, 7, 14, 21, 28,
35, 42, 49, 56, 57, 50, 43, 36,
29, 22, 15, 23, 30, 37, 44, 51,
58, 59, 52, 45, 38, 31, 39, 46,
53, 60, 61, 54, 47, 55, 62, 63,
// extra entries for safety in decoder
63, 63, 63, 63, 63, 63, 63, 63,
63, 63, 63, 63, 63, 63, 63, 63
};
constexpr uint32_t kJPEGZigZagOrder[64] = {
0, 1, 5, 6, 14, 15, 27, 28,
2, 4, 7, 13, 16, 26, 29, 42,
3, 8, 12, 17, 25, 30, 41, 43,
9, 11, 18, 24, 31, 40, 44, 53,
10, 19, 23, 32, 39, 45, 52, 54,
20, 22, 33, 38, 46, 51, 55, 60,
21, 34, 37, 47, 50, 56, 59, 61,
35, 36, 48, 49, 57, 58, 62, 63
};
/* clang-format on */
template <typename T>
class RowBuffer {
public:
template <typename CInfoType>
void Allocate(CInfoType cinfo, size_t num_rows, size_t rowsize) {
size_t vec_size = std::max(VectorSize(), sizeof(T));
JXL_CHECK(vec_size % sizeof(T) == 0);
size_t alignment = std::max<size_t>(HWY_ALIGNMENT, vec_size);
size_t min_memstride = alignment + rowsize * sizeof(T) + vec_size;
size_t memstride = RoundUpTo(min_memstride, alignment);
xsize_ = rowsize;
ysize_ = num_rows;
stride_ = memstride / sizeof(T);
offset_ = alignment / sizeof(T);
data_ = ::jpegli::Allocate<T>(cinfo, ysize_ * stride_, JPOOL_IMAGE_ALIGNED);
}
T* Row(ssize_t y) const {
return &data_[((ysize_ + y) % ysize_) * stride_ + offset_];
}
size_t xsize() const { return xsize_; };
size_t ysize() const { return ysize_; };
size_t stride() const { return stride_; }
void PadRow(size_t y, size_t from, int border) {
float* row = Row(y);
for (int offset = -border; offset < 0; ++offset) {
row[offset] = row[0];
}
float last_val = row[from - 1];
for (size_t x = from; x < xsize_ + border; ++x) {
row[x] = last_val;
}
}
void CopyRow(ssize_t dst_row, ssize_t src_row, int border) {
memcpy(Row(dst_row) - border, Row(src_row) - border,
(xsize_ + 2 * border) * sizeof(T));
}
void FillRow(ssize_t y, T val, size_t len) {
T* row = Row(y);
for (size_t x = 0; x < len; ++x) {
row[x] = val;
}
}
private:
size_t xsize_;
size_t ysize_;
size_t stride_;
size_t offset_;
T* data_;
};
} // namespace jpegli
#endif // LIB_JPEGLI_COMMON_INTERNAL_H_
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