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// Copyright 2017 The PDFium Authors
// 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.
#include <stdint.h>
#include <memory>
#include "core/fxcrt/unowned_ptr.h"
#include "third_party/base/containers/span.h"
#include <openjpeg.h>
#include "third_party/libopenjpeg/openjpeg.h"
namespace fxcodec {
struct DecodeData;
class CJPX_Decoder {
// Calculated as log2(2^32 / 1), where 2^32 is the largest image dimension and
// 1 is the smallest required size.
static constexpr uint8_t kMaxResolutionsToSkip = 32;
enum ColorSpaceOption {
struct JpxImageInfo {
uint32_t width;
uint32_t height;
uint32_t channels;
COLOR_SPACE colorspace;
static std::unique_ptr<CJPX_Decoder> Create(
pdfium::span<const uint8_t> src_span,
CJPX_Decoder::ColorSpaceOption option,
uint8_t resolution_levels_to_skip);
static void Sycc420ToRgbForTesting(opj_image_t* img);
JpxImageInfo GetInfo() const;
bool StartDecode();
// `swap_rgb` can only be set when an image's color space type contains at
// least 3 color components. Note that this `component_count` is not
// equivalent to `JpxImageInfo::channels`. The JpxImageInfo channels can
// contain extra information for rendering the image besides the color
// component information. Therefore the `JpxImageInfo::channels` must be no
// less than the component count.
// Example: If a JPX image's color space type is OPJ_CLRSPC_SRGB, the
// component count for this color space is 3, and the channel count of its
// JpxImageInfo can be 4. This is because the extra channel might contain
// extra information, such as the transparency level of the image.
bool Decode(pdfium::span<uint8_t> dest_buf,
uint32_t pitch,
bool swap_rgb,
uint32_t component_count);
// Use Create() to instantiate.
explicit CJPX_Decoder(ColorSpaceOption option);
bool Init(pdfium::span<const uint8_t> src_data,
uint8_t resolution_levels_to_skip);
const ColorSpaceOption m_ColorSpaceOption;
pdfium::span<const uint8_t> m_SrcData;
UnownedPtr<opj_image_t> m_Image;
UnownedPtr<opj_codec_t> m_Codec;
std::unique_ptr<DecodeData> m_DecodeData;
UnownedPtr<opj_stream_t> m_Stream;
opj_dparameters_t m_Parameters = {};
} // namespace fxcodec
using fxcodec::CJPX_Decoder;