Split cjpx_decoder.cpp off from ccodec_jpxmodule.cpp
There already is an existing cjpx_decoder.h, so it is annoying
that the corresponding code isn't in an equivalently named .cpp
file.
Change-Id: I2122e46eb6f5ff8bb8f41caac91246062b3b5868
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/55290
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
diff --git a/core/fxcodec/BUILD.gn b/core/fxcodec/BUILD.gn
index 3543360..479a7f5 100644
--- a/core/fxcodec/BUILD.gn
+++ b/core/fxcodec/BUILD.gn
@@ -27,6 +27,7 @@
"codec/ccodec_scanlinedecoder.h",
"codec/cfx_codec_memory.cpp",
"codec/cfx_codec_memory.h",
+ "codec/cjpx_decoder.cpp",
"codec/cjpx_decoder.h",
"codec/codec_int.h",
"codec/codec_module_iface.h",
diff --git a/core/fxcodec/codec/ccodec_jpxmodule.cpp b/core/fxcodec/codec/ccodec_jpxmodule.cpp
index 004e298..1df09d0 100644
--- a/core/fxcodec/codec/ccodec_jpxmodule.cpp
+++ b/core/fxcodec/codec/ccodec_jpxmodule.cpp
@@ -6,649 +6,8 @@
#include "core/fxcodec/codec/ccodec_jpxmodule.h"
-#include <algorithm>
-#include <limits>
-#include <memory>
-#include <type_traits>
-#include <utility>
-#include <vector>
-
-#include "core/fpdfapi/page/cpdf_colorspace.h"
#include "core/fxcodec/codec/cjpx_decoder.h"
-#include "core/fxcrt/fx_safe_types.h"
-#include "third_party/base/optional.h"
#include "third_party/base/ptr_util.h"
-#include "third_party/base/stl_util.h"
-
-#ifndef USE_SYSTEM_LIBOPENJPEG2
-#include "third_party/libopenjpeg20/openjpeg.h"
-#include "third_party/libopenjpeg20/opj_malloc.h"
-#endif
-
-namespace {
-
-// Used with std::unique_ptr to call opj_image_data_free on raw memory.
-struct OpjImageDataDeleter {
- inline void operator()(void* ptr) const { opj_image_data_free(ptr); }
-};
-
-using ScopedOpjImageData = std::unique_ptr<int, OpjImageDataDeleter>;
-
-struct OpjImageRgbData {
- ScopedOpjImageData r;
- ScopedOpjImageData g;
- ScopedOpjImageData b;
-};
-
-void fx_ignore_callback(const char* msg, void* client_data) {}
-
-opj_stream_t* fx_opj_stream_create_memory_stream(DecodeData* data) {
- if (!data || !data->src_data || data->src_size <= 0)
- return nullptr;
-
- opj_stream_t* stream = opj_stream_create(OPJ_J2K_STREAM_CHUNK_SIZE,
- /*p_is_input=*/OPJ_TRUE);
- if (!stream)
- return nullptr;
-
- opj_stream_set_user_data(stream, data, nullptr);
- opj_stream_set_user_data_length(stream, data->src_size);
- opj_stream_set_read_function(stream, opj_read_from_memory);
- opj_stream_set_skip_function(stream, opj_skip_from_memory);
- opj_stream_set_seek_function(stream, opj_seek_from_memory);
- return stream;
-}
-
-Optional<OpjImageRgbData> alloc_rgb(size_t size) {
- OpjImageRgbData data;
- data.r.reset(static_cast<int*>(opj_image_data_alloc(size)));
- if (!data.r)
- return {};
-
- data.g.reset(static_cast<int*>(opj_image_data_alloc(size)));
- if (!data.g)
- return {};
-
- data.b.reset(static_cast<int*>(opj_image_data_alloc(size)));
- if (!data.b)
- return {};
-
- return data;
-}
-
-void sycc_to_rgb(int offset,
- int upb,
- int y,
- int cb,
- int cr,
- int* out_r,
- int* out_g,
- int* out_b) {
- cb -= offset;
- cr -= offset;
- *out_r = pdfium::clamp(y + static_cast<int>(1.402 * cr), 0, upb);
- *out_g = pdfium::clamp(y - static_cast<int>(0.344 * cb + 0.714 * cr), 0, upb);
- *out_b = pdfium::clamp(y + static_cast<int>(1.772 * cb), 0, upb);
-}
-
-void sycc444_to_rgb(opj_image_t* img) {
- int prec = img->comps[0].prec;
- // If we shift 31 we're going to go negative, then things go bad.
- if (prec > 30)
- return;
- int offset = 1 << (prec - 1);
- int upb = (1 << prec) - 1;
- OPJ_UINT32 maxw =
- std::min({img->comps[0].w, img->comps[1].w, img->comps[2].w});
- OPJ_UINT32 maxh =
- std::min({img->comps[0].h, img->comps[1].h, img->comps[2].h});
- FX_SAFE_SIZE_T max_size = maxw;
- max_size *= maxh;
- max_size *= sizeof(int);
- if (!max_size.IsValid())
- return;
-
- const int* y = img->comps[0].data;
- const int* cb = img->comps[1].data;
- const int* cr = img->comps[2].data;
- if (!y || !cb || !cr)
- return;
-
- Optional<OpjImageRgbData> data = alloc_rgb(max_size.ValueOrDie());
- if (!data.has_value())
- return;
-
- int* r = data.value().r.get();
- int* g = data.value().g.get();
- int* b = data.value().b.get();
- max_size /= sizeof(int);
- for (size_t i = 0; i < max_size.ValueOrDie(); ++i)
- sycc_to_rgb(offset, upb, *y++, *cb++, *cr++, r++, g++, b++);
-
- opj_image_data_free(img->comps[0].data);
- opj_image_data_free(img->comps[1].data);
- opj_image_data_free(img->comps[2].data);
- img->comps[0].data = data.value().r.release();
- img->comps[1].data = data.value().g.release();
- img->comps[2].data = data.value().b.release();
-}
-
-bool sycc420_422_size_is_valid(opj_image_t* img) {
- return img && img->comps[0].w != std::numeric_limits<OPJ_UINT32>::max() &&
- (img->comps[0].w + 1) / 2 == img->comps[1].w &&
- img->comps[1].w == img->comps[2].w &&
- img->comps[1].h == img->comps[2].h;
-}
-
-bool sycc420_size_is_valid(opj_image_t* img) {
- return sycc420_422_size_is_valid(img) &&
- img->comps[0].h != std::numeric_limits<OPJ_UINT32>::max() &&
- (img->comps[0].h + 1) / 2 == img->comps[1].h;
-}
-
-bool sycc422_size_is_valid(opj_image_t* img) {
- return sycc420_422_size_is_valid(img) && img->comps[0].h == img->comps[1].h;
-}
-
-void sycc422_to_rgb(opj_image_t* img) {
- if (!sycc422_size_is_valid(img))
- return;
-
- int prec = img->comps[0].prec;
- if (prec <= 0 || prec >= 32)
- return;
-
- int offset = 1 << (prec - 1);
- int upb = (1 << prec) - 1;
- OPJ_UINT32 maxw = img->comps[0].w;
- OPJ_UINT32 maxh = img->comps[0].h;
- FX_SAFE_SIZE_T max_size = maxw;
- max_size *= maxh;
- max_size *= sizeof(int);
- if (!max_size.IsValid())
- return;
-
- const int* y = img->comps[0].data;
- const int* cb = img->comps[1].data;
- const int* cr = img->comps[2].data;
- if (!y || !cb || !cr)
- return;
-
- Optional<OpjImageRgbData> data = alloc_rgb(max_size.ValueOrDie());
- if (!data.has_value())
- return;
-
- int* r = data.value().r.get();
- int* g = data.value().g.get();
- int* b = data.value().b.get();
- for (uint32_t i = 0; i < maxh; ++i) {
- OPJ_UINT32 j;
- for (j = 0; j < (maxw & ~static_cast<OPJ_UINT32>(1)); j += 2) {
- sycc_to_rgb(offset, upb, *y++, *cb, *cr, r++, g++, b++);
- sycc_to_rgb(offset, upb, *y++, *cb++, *cr++, r++, g++, b++);
- }
- if (j < maxw) {
- sycc_to_rgb(offset, upb, *y++, *cb++, *cr++, r++, g++, b++);
- }
- }
-
- opj_image_data_free(img->comps[0].data);
- opj_image_data_free(img->comps[1].data);
- opj_image_data_free(img->comps[2].data);
- img->comps[0].data = data.value().r.release();
- img->comps[1].data = data.value().g.release();
- img->comps[2].data = data.value().b.release();
- img->comps[1].w = maxw;
- img->comps[1].h = maxh;
- img->comps[2].w = maxw;
- img->comps[2].h = maxh;
- img->comps[1].dx = img->comps[0].dx;
- img->comps[2].dx = img->comps[0].dx;
- img->comps[1].dy = img->comps[0].dy;
- img->comps[2].dy = img->comps[0].dy;
-}
-
-bool sycc420_must_extend_cbcr(OPJ_UINT32 y, OPJ_UINT32 cbcr) {
- return (y & 1) && (cbcr == y / 2);
-}
-
-bool is_sycc420(const opj_image_t* img) {
- return img->comps[0].dx == 1 && img->comps[0].dy == 1 &&
- img->comps[1].dx == 2 && img->comps[1].dy == 2 &&
- img->comps[2].dx == 2 && img->comps[2].dy == 2;
-}
-
-bool is_sycc422(const opj_image_t* img) {
- return img->comps[0].dx == 1 && img->comps[0].dy == 1 &&
- img->comps[1].dx == 2 && img->comps[1].dy == 1 &&
- img->comps[2].dx == 2 && img->comps[2].dy == 1;
-}
-
-bool is_sycc444(const opj_image_t* img) {
- return img->comps[0].dx == 1 && img->comps[0].dy == 1 &&
- img->comps[1].dx == 1 && img->comps[1].dy == 1 &&
- img->comps[2].dx == 1 && img->comps[2].dy == 1;
-}
-
-void color_sycc_to_rgb(opj_image_t* img) {
- if (img->numcomps < 3) {
- img->color_space = OPJ_CLRSPC_GRAY;
- return;
- }
- if (is_sycc420(img))
- sycc420_to_rgb(img);
- else if (is_sycc422(img))
- sycc422_to_rgb(img);
- else if (is_sycc444(img))
- sycc444_to_rgb(img);
- else
- return;
-
- img->color_space = OPJ_CLRSPC_SRGB;
-}
-
-} // namespace
-
-OPJ_SIZE_T opj_read_from_memory(void* p_buffer,
- OPJ_SIZE_T nb_bytes,
- void* p_user_data) {
- DecodeData* srcData = static_cast<DecodeData*>(p_user_data);
- if (!srcData || !srcData->src_data || srcData->src_size == 0)
- return static_cast<OPJ_SIZE_T>(-1);
-
- // Reads at EOF return an error code.
- if (srcData->offset >= srcData->src_size)
- return static_cast<OPJ_SIZE_T>(-1);
-
- OPJ_SIZE_T bufferLength = srcData->src_size - srcData->offset;
- OPJ_SIZE_T readlength = nb_bytes < bufferLength ? nb_bytes : bufferLength;
- memcpy(p_buffer, &srcData->src_data[srcData->offset], readlength);
- srcData->offset += readlength;
- return readlength;
-}
-
-OPJ_OFF_T opj_skip_from_memory(OPJ_OFF_T nb_bytes, void* p_user_data) {
- DecodeData* srcData = static_cast<DecodeData*>(p_user_data);
- if (!srcData || !srcData->src_data || srcData->src_size == 0)
- return static_cast<OPJ_OFF_T>(-1);
-
- // Offsets are signed and may indicate a negative skip. Do not support this
- // because of the strange return convention where either bytes skipped or
- // -1 is returned. Following that convention, a successful relative seek of
- // -1 bytes would be required to to give the same result as the error case.
- if (nb_bytes < 0)
- return static_cast<OPJ_OFF_T>(-1);
-
- auto unsigned_nb_bytes =
- static_cast<std::make_unsigned<OPJ_OFF_T>::type>(nb_bytes);
- // Additionally, the offset may take us beyond the range of a size_t (e.g.
- // 32-bit platforms). If so, just clamp at EOF.
- if (unsigned_nb_bytes >
- std::numeric_limits<OPJ_SIZE_T>::max() - srcData->offset) {
- srcData->offset = srcData->src_size;
- } else {
- OPJ_SIZE_T checked_nb_bytes = static_cast<OPJ_SIZE_T>(unsigned_nb_bytes);
- // Otherwise, mimic fseek() semantics to always succeed, even past EOF,
- // clamping at EOF. We can get away with this since we don't actually
- // provide negative relative skips from beyond EOF back to inside the
- // data, which would be the only reason to need to know exactly how far
- // beyond EOF we are.
- srcData->offset =
- std::min(srcData->offset + checked_nb_bytes, srcData->src_size);
- }
- return nb_bytes;
-}
-
-OPJ_BOOL opj_seek_from_memory(OPJ_OFF_T nb_bytes, void* p_user_data) {
- DecodeData* srcData = static_cast<DecodeData*>(p_user_data);
- if (!srcData || !srcData->src_data || srcData->src_size == 0)
- return OPJ_FALSE;
-
- // Offsets are signed and may indicate a negative position, which would
- // be before the start of the file. Do not support this.
- if (nb_bytes < 0)
- return OPJ_FALSE;
-
- auto unsigned_nb_bytes =
- static_cast<std::make_unsigned<OPJ_OFF_T>::type>(nb_bytes);
- // Additionally, the offset may take us beyond the range of a size_t (e.g.
- // 32-bit platforms). If so, just clamp at EOF.
- if (unsigned_nb_bytes > std::numeric_limits<OPJ_SIZE_T>::max()) {
- srcData->offset = srcData->src_size;
- } else {
- OPJ_SIZE_T checked_nb_bytes = static_cast<OPJ_SIZE_T>(nb_bytes);
- // Otherwise, mimic fseek() semantics to always succeed, even past EOF,
- // again clamping at EOF.
- srcData->offset = std::min(checked_nb_bytes, srcData->src_size);
- }
- return OPJ_TRUE;
-}
-
-void sycc420_to_rgb(opj_image_t* img) {
- if (!sycc420_size_is_valid(img))
- return;
-
- OPJ_UINT32 prec = img->comps[0].prec;
- if (!prec)
- return;
-
- OPJ_UINT32 offset = 1 << (prec - 1);
- OPJ_UINT32 upb = (1 << prec) - 1;
- OPJ_UINT32 yw = img->comps[0].w;
- OPJ_UINT32 yh = img->comps[0].h;
- OPJ_UINT32 cbw = img->comps[1].w;
- OPJ_UINT32 cbh = img->comps[1].h;
- OPJ_UINT32 crw = img->comps[2].w;
- bool extw = sycc420_must_extend_cbcr(yw, cbw);
- bool exth = sycc420_must_extend_cbcr(yh, cbh);
- FX_SAFE_UINT32 safe_size = yw;
- safe_size *= yh;
- safe_size *= sizeof(int);
- if (!safe_size.IsValid())
- return;
-
- const int* y = img->comps[0].data;
- const int* cb = img->comps[1].data;
- const int* cr = img->comps[2].data;
- if (!y || !cb || !cr)
- return;
-
- Optional<OpjImageRgbData> data = alloc_rgb(safe_size.ValueOrDie());
- if (!data.has_value())
- return;
-
- int* r = data.value().r.get();
- int* g = data.value().g.get();
- int* b = data.value().b.get();
- const int* ny = nullptr;
- int* nr = nullptr;
- int* ng = nullptr;
- int* nb = nullptr;
- OPJ_UINT32 i = 0;
- OPJ_UINT32 j = 0;
- for (i = 0; i < (yh & ~(OPJ_UINT32)1); i += 2) {
- ny = y + yw;
- nr = r + yw;
- ng = g + yw;
- nb = b + yw;
- for (j = 0; j < (yw & ~(OPJ_UINT32)1); j += 2) {
- sycc_to_rgb(offset, upb, *y, *cb, *cr, r, g, b);
- ++y;
- ++r;
- ++g;
- ++b;
- sycc_to_rgb(offset, upb, *y, *cb, *cr, r, g, b);
- ++y;
- ++r;
- ++g;
- ++b;
- sycc_to_rgb(offset, upb, *ny, *cb, *cr, nr, ng, nb);
- ++ny;
- ++nr;
- ++ng;
- ++nb;
- sycc_to_rgb(offset, upb, *ny, *cb, *cr, nr, ng, nb);
- ++ny;
- ++nr;
- ++ng;
- ++nb;
- ++cb;
- ++cr;
- }
- if (j < yw) {
- if (extw) {
- --cb;
- --cr;
- }
- sycc_to_rgb(offset, upb, *y, *cb, *cr, r, g, b);
- ++y;
- ++r;
- ++g;
- ++b;
- sycc_to_rgb(offset, upb, *ny, *cb, *cr, nr, ng, nb);
- ++ny;
- ++nr;
- ++ng;
- ++nb;
- ++cb;
- ++cr;
- }
- y += yw;
- r += yw;
- g += yw;
- b += yw;
- }
- if (i < yh) {
- if (exth) {
- cb -= cbw;
- cr -= crw;
- }
- for (j = 0; j < (yw & ~(OPJ_UINT32)1); j += 2) {
- sycc_to_rgb(offset, upb, *y, *cb, *cr, r, g, b);
- ++y;
- ++r;
- ++g;
- ++b;
- sycc_to_rgb(offset, upb, *y, *cb, *cr, r, g, b);
- ++y;
- ++r;
- ++g;
- ++b;
- ++cb;
- ++cr;
- }
- if (j < yw) {
- if (extw) {
- --cb;
- --cr;
- }
- sycc_to_rgb(offset, upb, *y, *cb, *cr, r, g, b);
- }
- }
-
- opj_image_data_free(img->comps[0].data);
- opj_image_data_free(img->comps[1].data);
- opj_image_data_free(img->comps[2].data);
- img->comps[0].data = data.value().r.release();
- img->comps[1].data = data.value().g.release();
- img->comps[2].data = data.value().b.release();
- img->comps[1].w = yw;
- img->comps[1].h = yh;
- img->comps[2].w = yw;
- img->comps[2].h = yh;
- img->comps[1].dx = img->comps[0].dx;
- img->comps[2].dx = img->comps[0].dx;
- img->comps[1].dy = img->comps[0].dy;
- img->comps[2].dy = img->comps[0].dy;
-}
-
-CJPX_Decoder::CJPX_Decoder(const RetainPtr<CPDF_ColorSpace>& cs)
- : m_Image(nullptr),
- m_Codec(nullptr),
- m_DecodeData(nullptr),
- m_Stream(nullptr),
- m_ColorSpace(cs) {}
-
-CJPX_Decoder::~CJPX_Decoder() {
- if (m_Codec)
- opj_destroy_codec(m_Codec.Release());
- if (m_Stream)
- opj_stream_destroy(m_Stream.Release());
- if (m_Image)
- opj_image_destroy(m_Image.Release());
-}
-
-bool CJPX_Decoder::Init(pdfium::span<const uint8_t> src_data) {
- static const unsigned char szJP2Header[] = {
- 0x00, 0x00, 0x00, 0x0c, 0x6a, 0x50, 0x20, 0x20, 0x0d, 0x0a, 0x87, 0x0a};
- if (src_data.empty() || src_data.size() < sizeof(szJP2Header))
- return false;
-
- m_Image = nullptr;
- m_SrcData = src_data;
- m_DecodeData =
- pdfium::MakeUnique<DecodeData>(src_data.data(), src_data.size());
- m_Stream = fx_opj_stream_create_memory_stream(m_DecodeData.get());
- if (!m_Stream)
- return false;
-
- opj_set_default_decoder_parameters(&m_Parameters);
- m_Parameters.decod_format = 0;
- m_Parameters.cod_format = 3;
- if (memcmp(m_SrcData.data(), szJP2Header, sizeof(szJP2Header)) == 0) {
- m_Codec = opj_create_decompress(OPJ_CODEC_JP2);
- m_Parameters.decod_format = 1;
- } else {
- m_Codec = opj_create_decompress(OPJ_CODEC_J2K);
- }
- if (!m_Codec)
- return false;
-
- if (m_ColorSpace && m_ColorSpace->GetFamily() == PDFCS_INDEXED)
- m_Parameters.flags |= OPJ_DPARAMETERS_IGNORE_PCLR_CMAP_CDEF_FLAG;
- opj_set_info_handler(m_Codec.Get(), fx_ignore_callback, nullptr);
- opj_set_warning_handler(m_Codec.Get(), fx_ignore_callback, nullptr);
- opj_set_error_handler(m_Codec.Get(), fx_ignore_callback, nullptr);
- if (!opj_setup_decoder(m_Codec.Get(), &m_Parameters))
- return false;
-
- m_Image = nullptr;
- opj_image_t* pTempImage = nullptr;
- if (!opj_read_header(m_Stream.Get(), m_Codec.Get(), &pTempImage))
- return false;
-
- m_Image = pTempImage;
-#ifndef USE_SYSTEM_LIBOPENJPEG2
- m_Image->pdfium_use_colorspace = !!m_ColorSpace;
-#endif
- return true;
-}
-
-bool CJPX_Decoder::StartDecode() {
- if (!m_Parameters.nb_tile_to_decode) {
- if (!opj_set_decode_area(m_Codec.Get(), m_Image.Get(), m_Parameters.DA_x0,
- m_Parameters.DA_y0, m_Parameters.DA_x1,
- m_Parameters.DA_y1)) {
- opj_image_destroy(m_Image.Release());
- return false;
- }
- if (!(opj_decode(m_Codec.Get(), m_Stream.Get(), m_Image.Get()) &&
- opj_end_decompress(m_Codec.Get(), m_Stream.Get()))) {
- opj_image_destroy(m_Image.Release());
- return false;
- }
- } else if (!opj_get_decoded_tile(m_Codec.Get(), m_Stream.Get(), m_Image.Get(),
- m_Parameters.tile_index)) {
- return false;
- }
-
- opj_stream_destroy(m_Stream.Release());
- if (m_Image->color_space != OPJ_CLRSPC_SYCC && m_Image->numcomps == 3 &&
- m_Image->comps[0].dx == m_Image->comps[0].dy &&
- m_Image->comps[1].dx != 1) {
- m_Image->color_space = OPJ_CLRSPC_SYCC;
- } else if (m_Image->numcomps <= 2) {
- m_Image->color_space = OPJ_CLRSPC_GRAY;
- }
- if (m_Image->color_space == OPJ_CLRSPC_SYCC)
- color_sycc_to_rgb(m_Image.Get());
-
- if (m_Image->icc_profile_buf) {
- // TODO(palmer): Using |opj_free| here resolves the crash described in
- // https://crbug.com/737033, but ultimately we need to harmonize the
- // memory allocation strategy across OpenJPEG and its PDFium callers.
-#ifndef USE_SYSTEM_LIBOPENJPEG2
- opj_free(m_Image->icc_profile_buf);
-#else
- free(m_Image->icc_profile_buf);
-#endif
- m_Image->icc_profile_buf = nullptr;
- m_Image->icc_profile_len = 0;
- }
- return true;
-}
-
-void CJPX_Decoder::GetInfo(uint32_t* width,
- uint32_t* height,
- uint32_t* components) {
- *width = m_Image->x1;
- *height = m_Image->y1;
- *components = m_Image->numcomps;
-}
-
-bool CJPX_Decoder::Decode(uint8_t* dest_buf,
- uint32_t pitch,
- const std::vector<uint8_t>& offsets) {
- if (m_Image->comps[0].w != m_Image->x1 || m_Image->comps[0].h != m_Image->y1)
- return false;
-
- if (pitch<(m_Image->comps[0].w * 8 * m_Image->numcomps + 31)>> 5 << 2) {
- return false;
- }
-
- memset(dest_buf, 0xff, m_Image->y1 * pitch);
- std::vector<uint8_t*> channel_bufs(m_Image->numcomps);
- std::vector<int> adjust_comps(m_Image->numcomps);
- for (uint32_t i = 0; i < m_Image->numcomps; i++) {
- channel_bufs[i] = dest_buf + offsets[i];
- adjust_comps[i] = m_Image->comps[i].prec - 8;
- if (i > 0) {
- if (m_Image->comps[i].dx != m_Image->comps[i - 1].dx ||
- m_Image->comps[i].dy != m_Image->comps[i - 1].dy ||
- m_Image->comps[i].prec != m_Image->comps[i - 1].prec) {
- return false;
- }
- }
- }
- uint32_t width = m_Image->comps[0].w;
- uint32_t height = m_Image->comps[0].h;
- for (uint32_t channel = 0; channel < m_Image->numcomps; ++channel) {
- uint8_t* pChannel = channel_bufs[channel];
- if (adjust_comps[channel] < 0) {
- for (uint32_t row = 0; row < height; ++row) {
- uint8_t* pScanline = pChannel + row * pitch;
- for (uint32_t col = 0; col < width; ++col) {
- uint8_t* pPixel = pScanline + col * m_Image->numcomps;
- if (!m_Image->comps[channel].data)
- continue;
-
- int src = m_Image->comps[channel].data[row * width + col];
- src += m_Image->comps[channel].sgnd
- ? 1 << (m_Image->comps[channel].prec - 1)
- : 0;
- if (adjust_comps[channel] > 0) {
- *pPixel = 0;
- } else {
- *pPixel = static_cast<uint8_t>(src << -adjust_comps[channel]);
- }
- }
- }
- } else {
- for (uint32_t row = 0; row < height; ++row) {
- uint8_t* pScanline = pChannel + row * pitch;
- for (uint32_t col = 0; col < width; ++col) {
- uint8_t* pPixel = pScanline + col * m_Image->numcomps;
- if (!m_Image->comps[channel].data)
- continue;
-
- int src = m_Image->comps[channel].data[row * width + col];
- src += m_Image->comps[channel].sgnd
- ? 1 << (m_Image->comps[channel].prec - 1)
- : 0;
- if (adjust_comps[channel] - 1 < 0) {
- *pPixel = static_cast<uint8_t>((src >> adjust_comps[channel]));
- } else {
- int tmpPixel = (src >> adjust_comps[channel]) +
- ((src >> (adjust_comps[channel] - 1)) % 2);
- tmpPixel = pdfium::clamp(tmpPixel, 0, 255);
- *pPixel = static_cast<uint8_t>(tmpPixel);
- }
- }
- }
- }
- }
- return true;
-}
// static
std::unique_ptr<CJPX_Decoder> CCodec_JpxModule::CreateDecoder(
diff --git a/core/fxcodec/codec/cjpx_decoder.cpp b/core/fxcodec/codec/cjpx_decoder.cpp
new file mode 100644
index 0000000..3614141
--- /dev/null
+++ b/core/fxcodec/codec/cjpx_decoder.cpp
@@ -0,0 +1,650 @@
+// Copyright 2019 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/codec/cjpx_decoder.h"
+
+#include <algorithm>
+#include <limits>
+#include <memory>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+#include "core/fpdfapi/page/cpdf_colorspace.h"
+#include "core/fxcrt/fx_safe_types.h"
+#include "third_party/base/optional.h"
+#include "third_party/base/ptr_util.h"
+#include "third_party/base/stl_util.h"
+
+#ifndef USE_SYSTEM_LIBOPENJPEG2
+#include "third_party/libopenjpeg20/openjpeg.h"
+#include "third_party/libopenjpeg20/opj_malloc.h"
+#endif
+
+namespace {
+
+// Used with std::unique_ptr to call opj_image_data_free on raw memory.
+struct OpjImageDataDeleter {
+ inline void operator()(void* ptr) const { opj_image_data_free(ptr); }
+};
+
+using ScopedOpjImageData = std::unique_ptr<int, OpjImageDataDeleter>;
+
+struct OpjImageRgbData {
+ ScopedOpjImageData r;
+ ScopedOpjImageData g;
+ ScopedOpjImageData b;
+};
+
+void fx_ignore_callback(const char* msg, void* client_data) {}
+
+opj_stream_t* fx_opj_stream_create_memory_stream(DecodeData* data) {
+ if (!data || !data->src_data || data->src_size <= 0)
+ return nullptr;
+
+ opj_stream_t* stream = opj_stream_create(OPJ_J2K_STREAM_CHUNK_SIZE,
+ /*p_is_input=*/OPJ_TRUE);
+ if (!stream)
+ return nullptr;
+
+ opj_stream_set_user_data(stream, data, nullptr);
+ opj_stream_set_user_data_length(stream, data->src_size);
+ opj_stream_set_read_function(stream, opj_read_from_memory);
+ opj_stream_set_skip_function(stream, opj_skip_from_memory);
+ opj_stream_set_seek_function(stream, opj_seek_from_memory);
+ return stream;
+}
+
+Optional<OpjImageRgbData> alloc_rgb(size_t size) {
+ OpjImageRgbData data;
+ data.r.reset(static_cast<int*>(opj_image_data_alloc(size)));
+ if (!data.r)
+ return {};
+
+ data.g.reset(static_cast<int*>(opj_image_data_alloc(size)));
+ if (!data.g)
+ return {};
+
+ data.b.reset(static_cast<int*>(opj_image_data_alloc(size)));
+ if (!data.b)
+ return {};
+
+ return data;
+}
+
+void sycc_to_rgb(int offset,
+ int upb,
+ int y,
+ int cb,
+ int cr,
+ int* out_r,
+ int* out_g,
+ int* out_b) {
+ cb -= offset;
+ cr -= offset;
+ *out_r = pdfium::clamp(y + static_cast<int>(1.402 * cr), 0, upb);
+ *out_g = pdfium::clamp(y - static_cast<int>(0.344 * cb + 0.714 * cr), 0, upb);
+ *out_b = pdfium::clamp(y + static_cast<int>(1.772 * cb), 0, upb);
+}
+
+void sycc444_to_rgb(opj_image_t* img) {
+ int prec = img->comps[0].prec;
+ // If we shift 31 we're going to go negative, then things go bad.
+ if (prec > 30)
+ return;
+ int offset = 1 << (prec - 1);
+ int upb = (1 << prec) - 1;
+ OPJ_UINT32 maxw =
+ std::min({img->comps[0].w, img->comps[1].w, img->comps[2].w});
+ OPJ_UINT32 maxh =
+ std::min({img->comps[0].h, img->comps[1].h, img->comps[2].h});
+ FX_SAFE_SIZE_T max_size = maxw;
+ max_size *= maxh;
+ max_size *= sizeof(int);
+ if (!max_size.IsValid())
+ return;
+
+ const int* y = img->comps[0].data;
+ const int* cb = img->comps[1].data;
+ const int* cr = img->comps[2].data;
+ if (!y || !cb || !cr)
+ return;
+
+ Optional<OpjImageRgbData> data = alloc_rgb(max_size.ValueOrDie());
+ if (!data.has_value())
+ return;
+
+ int* r = data.value().r.get();
+ int* g = data.value().g.get();
+ int* b = data.value().b.get();
+ max_size /= sizeof(int);
+ for (size_t i = 0; i < max_size.ValueOrDie(); ++i)
+ sycc_to_rgb(offset, upb, *y++, *cb++, *cr++, r++, g++, b++);
+
+ opj_image_data_free(img->comps[0].data);
+ opj_image_data_free(img->comps[1].data);
+ opj_image_data_free(img->comps[2].data);
+ img->comps[0].data = data.value().r.release();
+ img->comps[1].data = data.value().g.release();
+ img->comps[2].data = data.value().b.release();
+}
+
+bool sycc420_422_size_is_valid(opj_image_t* img) {
+ return img && img->comps[0].w != std::numeric_limits<OPJ_UINT32>::max() &&
+ (img->comps[0].w + 1) / 2 == img->comps[1].w &&
+ img->comps[1].w == img->comps[2].w &&
+ img->comps[1].h == img->comps[2].h;
+}
+
+bool sycc420_size_is_valid(opj_image_t* img) {
+ return sycc420_422_size_is_valid(img) &&
+ img->comps[0].h != std::numeric_limits<OPJ_UINT32>::max() &&
+ (img->comps[0].h + 1) / 2 == img->comps[1].h;
+}
+
+bool sycc422_size_is_valid(opj_image_t* img) {
+ return sycc420_422_size_is_valid(img) && img->comps[0].h == img->comps[1].h;
+}
+
+void sycc422_to_rgb(opj_image_t* img) {
+ if (!sycc422_size_is_valid(img))
+ return;
+
+ int prec = img->comps[0].prec;
+ if (prec <= 0 || prec >= 32)
+ return;
+
+ int offset = 1 << (prec - 1);
+ int upb = (1 << prec) - 1;
+ OPJ_UINT32 maxw = img->comps[0].w;
+ OPJ_UINT32 maxh = img->comps[0].h;
+ FX_SAFE_SIZE_T max_size = maxw;
+ max_size *= maxh;
+ max_size *= sizeof(int);
+ if (!max_size.IsValid())
+ return;
+
+ const int* y = img->comps[0].data;
+ const int* cb = img->comps[1].data;
+ const int* cr = img->comps[2].data;
+ if (!y || !cb || !cr)
+ return;
+
+ Optional<OpjImageRgbData> data = alloc_rgb(max_size.ValueOrDie());
+ if (!data.has_value())
+ return;
+
+ int* r = data.value().r.get();
+ int* g = data.value().g.get();
+ int* b = data.value().b.get();
+ for (uint32_t i = 0; i < maxh; ++i) {
+ OPJ_UINT32 j;
+ for (j = 0; j < (maxw & ~static_cast<OPJ_UINT32>(1)); j += 2) {
+ sycc_to_rgb(offset, upb, *y++, *cb, *cr, r++, g++, b++);
+ sycc_to_rgb(offset, upb, *y++, *cb++, *cr++, r++, g++, b++);
+ }
+ if (j < maxw) {
+ sycc_to_rgb(offset, upb, *y++, *cb++, *cr++, r++, g++, b++);
+ }
+ }
+
+ opj_image_data_free(img->comps[0].data);
+ opj_image_data_free(img->comps[1].data);
+ opj_image_data_free(img->comps[2].data);
+ img->comps[0].data = data.value().r.release();
+ img->comps[1].data = data.value().g.release();
+ img->comps[2].data = data.value().b.release();
+ img->comps[1].w = maxw;
+ img->comps[1].h = maxh;
+ img->comps[2].w = maxw;
+ img->comps[2].h = maxh;
+ img->comps[1].dx = img->comps[0].dx;
+ img->comps[2].dx = img->comps[0].dx;
+ img->comps[1].dy = img->comps[0].dy;
+ img->comps[2].dy = img->comps[0].dy;
+}
+
+bool sycc420_must_extend_cbcr(OPJ_UINT32 y, OPJ_UINT32 cbcr) {
+ return (y & 1) && (cbcr == y / 2);
+}
+
+bool is_sycc420(const opj_image_t* img) {
+ return img->comps[0].dx == 1 && img->comps[0].dy == 1 &&
+ img->comps[1].dx == 2 && img->comps[1].dy == 2 &&
+ img->comps[2].dx == 2 && img->comps[2].dy == 2;
+}
+
+bool is_sycc422(const opj_image_t* img) {
+ return img->comps[0].dx == 1 && img->comps[0].dy == 1 &&
+ img->comps[1].dx == 2 && img->comps[1].dy == 1 &&
+ img->comps[2].dx == 2 && img->comps[2].dy == 1;
+}
+
+bool is_sycc444(const opj_image_t* img) {
+ return img->comps[0].dx == 1 && img->comps[0].dy == 1 &&
+ img->comps[1].dx == 1 && img->comps[1].dy == 1 &&
+ img->comps[2].dx == 1 && img->comps[2].dy == 1;
+}
+
+void color_sycc_to_rgb(opj_image_t* img) {
+ if (img->numcomps < 3) {
+ img->color_space = OPJ_CLRSPC_GRAY;
+ return;
+ }
+ if (is_sycc420(img))
+ sycc420_to_rgb(img);
+ else if (is_sycc422(img))
+ sycc422_to_rgb(img);
+ else if (is_sycc444(img))
+ sycc444_to_rgb(img);
+ else
+ return;
+
+ img->color_space = OPJ_CLRSPC_SRGB;
+}
+
+} // namespace
+
+OPJ_SIZE_T opj_read_from_memory(void* p_buffer,
+ OPJ_SIZE_T nb_bytes,
+ void* p_user_data) {
+ DecodeData* srcData = static_cast<DecodeData*>(p_user_data);
+ if (!srcData || !srcData->src_data || srcData->src_size == 0)
+ return static_cast<OPJ_SIZE_T>(-1);
+
+ // Reads at EOF return an error code.
+ if (srcData->offset >= srcData->src_size)
+ return static_cast<OPJ_SIZE_T>(-1);
+
+ OPJ_SIZE_T bufferLength = srcData->src_size - srcData->offset;
+ OPJ_SIZE_T readlength = nb_bytes < bufferLength ? nb_bytes : bufferLength;
+ memcpy(p_buffer, &srcData->src_data[srcData->offset], readlength);
+ srcData->offset += readlength;
+ return readlength;
+}
+
+OPJ_OFF_T opj_skip_from_memory(OPJ_OFF_T nb_bytes, void* p_user_data) {
+ DecodeData* srcData = static_cast<DecodeData*>(p_user_data);
+ if (!srcData || !srcData->src_data || srcData->src_size == 0)
+ return static_cast<OPJ_OFF_T>(-1);
+
+ // Offsets are signed and may indicate a negative skip. Do not support this
+ // because of the strange return convention where either bytes skipped or
+ // -1 is returned. Following that convention, a successful relative seek of
+ // -1 bytes would be required to to give the same result as the error case.
+ if (nb_bytes < 0)
+ return static_cast<OPJ_OFF_T>(-1);
+
+ auto unsigned_nb_bytes =
+ static_cast<std::make_unsigned<OPJ_OFF_T>::type>(nb_bytes);
+ // Additionally, the offset may take us beyond the range of a size_t (e.g.
+ // 32-bit platforms). If so, just clamp at EOF.
+ if (unsigned_nb_bytes >
+ std::numeric_limits<OPJ_SIZE_T>::max() - srcData->offset) {
+ srcData->offset = srcData->src_size;
+ } else {
+ OPJ_SIZE_T checked_nb_bytes = static_cast<OPJ_SIZE_T>(unsigned_nb_bytes);
+ // Otherwise, mimic fseek() semantics to always succeed, even past EOF,
+ // clamping at EOF. We can get away with this since we don't actually
+ // provide negative relative skips from beyond EOF back to inside the
+ // data, which would be the only reason to need to know exactly how far
+ // beyond EOF we are.
+ srcData->offset =
+ std::min(srcData->offset + checked_nb_bytes, srcData->src_size);
+ }
+ return nb_bytes;
+}
+
+OPJ_BOOL opj_seek_from_memory(OPJ_OFF_T nb_bytes, void* p_user_data) {
+ DecodeData* srcData = static_cast<DecodeData*>(p_user_data);
+ if (!srcData || !srcData->src_data || srcData->src_size == 0)
+ return OPJ_FALSE;
+
+ // Offsets are signed and may indicate a negative position, which would
+ // be before the start of the file. Do not support this.
+ if (nb_bytes < 0)
+ return OPJ_FALSE;
+
+ auto unsigned_nb_bytes =
+ static_cast<std::make_unsigned<OPJ_OFF_T>::type>(nb_bytes);
+ // Additionally, the offset may take us beyond the range of a size_t (e.g.
+ // 32-bit platforms). If so, just clamp at EOF.
+ if (unsigned_nb_bytes > std::numeric_limits<OPJ_SIZE_T>::max()) {
+ srcData->offset = srcData->src_size;
+ } else {
+ OPJ_SIZE_T checked_nb_bytes = static_cast<OPJ_SIZE_T>(nb_bytes);
+ // Otherwise, mimic fseek() semantics to always succeed, even past EOF,
+ // again clamping at EOF.
+ srcData->offset = std::min(checked_nb_bytes, srcData->src_size);
+ }
+ return OPJ_TRUE;
+}
+
+void sycc420_to_rgb(opj_image_t* img) {
+ if (!sycc420_size_is_valid(img))
+ return;
+
+ OPJ_UINT32 prec = img->comps[0].prec;
+ if (!prec)
+ return;
+
+ OPJ_UINT32 offset = 1 << (prec - 1);
+ OPJ_UINT32 upb = (1 << prec) - 1;
+ OPJ_UINT32 yw = img->comps[0].w;
+ OPJ_UINT32 yh = img->comps[0].h;
+ OPJ_UINT32 cbw = img->comps[1].w;
+ OPJ_UINT32 cbh = img->comps[1].h;
+ OPJ_UINT32 crw = img->comps[2].w;
+ bool extw = sycc420_must_extend_cbcr(yw, cbw);
+ bool exth = sycc420_must_extend_cbcr(yh, cbh);
+ FX_SAFE_UINT32 safe_size = yw;
+ safe_size *= yh;
+ safe_size *= sizeof(int);
+ if (!safe_size.IsValid())
+ return;
+
+ const int* y = img->comps[0].data;
+ const int* cb = img->comps[1].data;
+ const int* cr = img->comps[2].data;
+ if (!y || !cb || !cr)
+ return;
+
+ Optional<OpjImageRgbData> data = alloc_rgb(safe_size.ValueOrDie());
+ if (!data.has_value())
+ return;
+
+ int* r = data.value().r.get();
+ int* g = data.value().g.get();
+ int* b = data.value().b.get();
+ const int* ny = nullptr;
+ int* nr = nullptr;
+ int* ng = nullptr;
+ int* nb = nullptr;
+ OPJ_UINT32 i = 0;
+ OPJ_UINT32 j = 0;
+ for (i = 0; i < (yh & ~(OPJ_UINT32)1); i += 2) {
+ ny = y + yw;
+ nr = r + yw;
+ ng = g + yw;
+ nb = b + yw;
+ for (j = 0; j < (yw & ~(OPJ_UINT32)1); j += 2) {
+ sycc_to_rgb(offset, upb, *y, *cb, *cr, r, g, b);
+ ++y;
+ ++r;
+ ++g;
+ ++b;
+ sycc_to_rgb(offset, upb, *y, *cb, *cr, r, g, b);
+ ++y;
+ ++r;
+ ++g;
+ ++b;
+ sycc_to_rgb(offset, upb, *ny, *cb, *cr, nr, ng, nb);
+ ++ny;
+ ++nr;
+ ++ng;
+ ++nb;
+ sycc_to_rgb(offset, upb, *ny, *cb, *cr, nr, ng, nb);
+ ++ny;
+ ++nr;
+ ++ng;
+ ++nb;
+ ++cb;
+ ++cr;
+ }
+ if (j < yw) {
+ if (extw) {
+ --cb;
+ --cr;
+ }
+ sycc_to_rgb(offset, upb, *y, *cb, *cr, r, g, b);
+ ++y;
+ ++r;
+ ++g;
+ ++b;
+ sycc_to_rgb(offset, upb, *ny, *cb, *cr, nr, ng, nb);
+ ++ny;
+ ++nr;
+ ++ng;
+ ++nb;
+ ++cb;
+ ++cr;
+ }
+ y += yw;
+ r += yw;
+ g += yw;
+ b += yw;
+ }
+ if (i < yh) {
+ if (exth) {
+ cb -= cbw;
+ cr -= crw;
+ }
+ for (j = 0; j < (yw & ~(OPJ_UINT32)1); j += 2) {
+ sycc_to_rgb(offset, upb, *y, *cb, *cr, r, g, b);
+ ++y;
+ ++r;
+ ++g;
+ ++b;
+ sycc_to_rgb(offset, upb, *y, *cb, *cr, r, g, b);
+ ++y;
+ ++r;
+ ++g;
+ ++b;
+ ++cb;
+ ++cr;
+ }
+ if (j < yw) {
+ if (extw) {
+ --cb;
+ --cr;
+ }
+ sycc_to_rgb(offset, upb, *y, *cb, *cr, r, g, b);
+ }
+ }
+
+ opj_image_data_free(img->comps[0].data);
+ opj_image_data_free(img->comps[1].data);
+ opj_image_data_free(img->comps[2].data);
+ img->comps[0].data = data.value().r.release();
+ img->comps[1].data = data.value().g.release();
+ img->comps[2].data = data.value().b.release();
+ img->comps[1].w = yw;
+ img->comps[1].h = yh;
+ img->comps[2].w = yw;
+ img->comps[2].h = yh;
+ img->comps[1].dx = img->comps[0].dx;
+ img->comps[2].dx = img->comps[0].dx;
+ img->comps[1].dy = img->comps[0].dy;
+ img->comps[2].dy = img->comps[0].dy;
+}
+
+CJPX_Decoder::CJPX_Decoder(const RetainPtr<CPDF_ColorSpace>& cs)
+ : m_Image(nullptr),
+ m_Codec(nullptr),
+ m_DecodeData(nullptr),
+ m_Stream(nullptr),
+ m_ColorSpace(cs) {}
+
+CJPX_Decoder::~CJPX_Decoder() {
+ if (m_Codec)
+ opj_destroy_codec(m_Codec.Release());
+ if (m_Stream)
+ opj_stream_destroy(m_Stream.Release());
+ if (m_Image)
+ opj_image_destroy(m_Image.Release());
+}
+
+bool CJPX_Decoder::Init(pdfium::span<const uint8_t> src_data) {
+ static const unsigned char szJP2Header[] = {
+ 0x00, 0x00, 0x00, 0x0c, 0x6a, 0x50, 0x20, 0x20, 0x0d, 0x0a, 0x87, 0x0a};
+ if (src_data.empty() || src_data.size() < sizeof(szJP2Header))
+ return false;
+
+ m_Image = nullptr;
+ m_SrcData = src_data;
+ m_DecodeData =
+ pdfium::MakeUnique<DecodeData>(src_data.data(), src_data.size());
+ m_Stream = fx_opj_stream_create_memory_stream(m_DecodeData.get());
+ if (!m_Stream)
+ return false;
+
+ opj_set_default_decoder_parameters(&m_Parameters);
+ m_Parameters.decod_format = 0;
+ m_Parameters.cod_format = 3;
+ if (memcmp(m_SrcData.data(), szJP2Header, sizeof(szJP2Header)) == 0) {
+ m_Codec = opj_create_decompress(OPJ_CODEC_JP2);
+ m_Parameters.decod_format = 1;
+ } else {
+ m_Codec = opj_create_decompress(OPJ_CODEC_J2K);
+ }
+ if (!m_Codec)
+ return false;
+
+ if (m_ColorSpace && m_ColorSpace->GetFamily() == PDFCS_INDEXED)
+ m_Parameters.flags |= OPJ_DPARAMETERS_IGNORE_PCLR_CMAP_CDEF_FLAG;
+ opj_set_info_handler(m_Codec.Get(), fx_ignore_callback, nullptr);
+ opj_set_warning_handler(m_Codec.Get(), fx_ignore_callback, nullptr);
+ opj_set_error_handler(m_Codec.Get(), fx_ignore_callback, nullptr);
+ if (!opj_setup_decoder(m_Codec.Get(), &m_Parameters))
+ return false;
+
+ m_Image = nullptr;
+ opj_image_t* pTempImage = nullptr;
+ if (!opj_read_header(m_Stream.Get(), m_Codec.Get(), &pTempImage))
+ return false;
+
+ m_Image = pTempImage;
+#ifndef USE_SYSTEM_LIBOPENJPEG2
+ m_Image->pdfium_use_colorspace = !!m_ColorSpace;
+#endif
+ return true;
+}
+
+bool CJPX_Decoder::StartDecode() {
+ if (!m_Parameters.nb_tile_to_decode) {
+ if (!opj_set_decode_area(m_Codec.Get(), m_Image.Get(), m_Parameters.DA_x0,
+ m_Parameters.DA_y0, m_Parameters.DA_x1,
+ m_Parameters.DA_y1)) {
+ opj_image_destroy(m_Image.Release());
+ return false;
+ }
+ if (!(opj_decode(m_Codec.Get(), m_Stream.Get(), m_Image.Get()) &&
+ opj_end_decompress(m_Codec.Get(), m_Stream.Get()))) {
+ opj_image_destroy(m_Image.Release());
+ return false;
+ }
+ } else if (!opj_get_decoded_tile(m_Codec.Get(), m_Stream.Get(), m_Image.Get(),
+ m_Parameters.tile_index)) {
+ return false;
+ }
+
+ opj_stream_destroy(m_Stream.Release());
+ if (m_Image->color_space != OPJ_CLRSPC_SYCC && m_Image->numcomps == 3 &&
+ m_Image->comps[0].dx == m_Image->comps[0].dy &&
+ m_Image->comps[1].dx != 1) {
+ m_Image->color_space = OPJ_CLRSPC_SYCC;
+ } else if (m_Image->numcomps <= 2) {
+ m_Image->color_space = OPJ_CLRSPC_GRAY;
+ }
+ if (m_Image->color_space == OPJ_CLRSPC_SYCC)
+ color_sycc_to_rgb(m_Image.Get());
+
+ if (m_Image->icc_profile_buf) {
+ // TODO(palmer): Using |opj_free| here resolves the crash described in
+ // https://crbug.com/737033, but ultimately we need to harmonize the
+ // memory allocation strategy across OpenJPEG and its PDFium callers.
+#ifndef USE_SYSTEM_LIBOPENJPEG2
+ opj_free(m_Image->icc_profile_buf);
+#else
+ free(m_Image->icc_profile_buf);
+#endif
+ m_Image->icc_profile_buf = nullptr;
+ m_Image->icc_profile_len = 0;
+ }
+ return true;
+}
+
+void CJPX_Decoder::GetInfo(uint32_t* width,
+ uint32_t* height,
+ uint32_t* components) {
+ *width = m_Image->x1;
+ *height = m_Image->y1;
+ *components = m_Image->numcomps;
+}
+
+bool CJPX_Decoder::Decode(uint8_t* dest_buf,
+ uint32_t pitch,
+ const std::vector<uint8_t>& offsets) {
+ if (m_Image->comps[0].w != m_Image->x1 || m_Image->comps[0].h != m_Image->y1)
+ return false;
+
+ if (pitch<(m_Image->comps[0].w * 8 * m_Image->numcomps + 31)>> 5 << 2) {
+ return false;
+ }
+
+ memset(dest_buf, 0xff, m_Image->y1 * pitch);
+ std::vector<uint8_t*> channel_bufs(m_Image->numcomps);
+ std::vector<int> adjust_comps(m_Image->numcomps);
+ for (uint32_t i = 0; i < m_Image->numcomps; i++) {
+ channel_bufs[i] = dest_buf + offsets[i];
+ adjust_comps[i] = m_Image->comps[i].prec - 8;
+ if (i > 0) {
+ if (m_Image->comps[i].dx != m_Image->comps[i - 1].dx ||
+ m_Image->comps[i].dy != m_Image->comps[i - 1].dy ||
+ m_Image->comps[i].prec != m_Image->comps[i - 1].prec) {
+ return false;
+ }
+ }
+ }
+ uint32_t width = m_Image->comps[0].w;
+ uint32_t height = m_Image->comps[0].h;
+ for (uint32_t channel = 0; channel < m_Image->numcomps; ++channel) {
+ uint8_t* pChannel = channel_bufs[channel];
+ if (adjust_comps[channel] < 0) {
+ for (uint32_t row = 0; row < height; ++row) {
+ uint8_t* pScanline = pChannel + row * pitch;
+ for (uint32_t col = 0; col < width; ++col) {
+ uint8_t* pPixel = pScanline + col * m_Image->numcomps;
+ if (!m_Image->comps[channel].data)
+ continue;
+
+ int src = m_Image->comps[channel].data[row * width + col];
+ src += m_Image->comps[channel].sgnd
+ ? 1 << (m_Image->comps[channel].prec - 1)
+ : 0;
+ if (adjust_comps[channel] > 0) {
+ *pPixel = 0;
+ } else {
+ *pPixel = static_cast<uint8_t>(src << -adjust_comps[channel]);
+ }
+ }
+ }
+ } else {
+ for (uint32_t row = 0; row < height; ++row) {
+ uint8_t* pScanline = pChannel + row * pitch;
+ for (uint32_t col = 0; col < width; ++col) {
+ uint8_t* pPixel = pScanline + col * m_Image->numcomps;
+ if (!m_Image->comps[channel].data)
+ continue;
+
+ int src = m_Image->comps[channel].data[row * width + col];
+ src += m_Image->comps[channel].sgnd
+ ? 1 << (m_Image->comps[channel].prec - 1)
+ : 0;
+ if (adjust_comps[channel] - 1 < 0) {
+ *pPixel = static_cast<uint8_t>((src >> adjust_comps[channel]));
+ } else {
+ int tmpPixel = (src >> adjust_comps[channel]) +
+ ((src >> (adjust_comps[channel] - 1)) % 2);
+ tmpPixel = pdfium::clamp(tmpPixel, 0, 255);
+ *pPixel = static_cast<uint8_t>(tmpPixel);
+ }
+ }
+ }
+ }
+ }
+ return true;
+}
