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path: root/core/fxcodec/codec/ccodec_jpxmodule.cpp
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Diffstat (limited to 'core/fxcodec/codec/ccodec_jpxmodule.cpp')
-rw-r--r--core/fxcodec/codec/ccodec_jpxmodule.cpp668
1 files changed, 668 insertions, 0 deletions
diff --git a/core/fxcodec/codec/ccodec_jpxmodule.cpp b/core/fxcodec/codec/ccodec_jpxmodule.cpp
new file mode 100644
index 0000000000..ce6a1301fd
--- /dev/null
+++ b/core/fxcodec/codec/ccodec_jpxmodule.cpp
@@ -0,0 +1,668 @@
+// 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/codec/ccodec_jpxmodule.h"
+
+#include <algorithm>
+#include <limits>
+#include <memory>
+#include <utility>
+#include <vector>
+
+#include "core/fpdfapi/page/cpdf_colorspace.h"
+#include "core/fxcodec/codec/cjpx_decoder.h"
+#include "core/fxcrt/fx_memory.h"
+#include "core/fxcrt/fx_safe_types.h"
+#include "third_party/base/ptr_util.h"
+#include "third_party/libopenjpeg20/openjpeg.h"
+#include "third_party/libopenjpeg20/opj_malloc.h"
+
+namespace {
+
+void fx_ignore_callback(const char* msg, void* client_data) {}
+
+opj_stream_t* fx_opj_stream_create_memory_stream(DecodeData* data,
+ OPJ_SIZE_T p_size,
+ OPJ_BOOL p_is_read_stream) {
+ if (!data || !data->src_data || data->src_size <= 0)
+ return nullptr;
+
+ opj_stream_t* stream = opj_stream_create(p_size, p_is_read_stream);
+ 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;
+}
+
+bool alloc_rgb(int** out_r, int** out_g, int** out_b, size_t size) {
+ int* r = static_cast<int*>(opj_image_data_alloc(size));
+ if (!r)
+ return false;
+
+ int* g = static_cast<int*>(opj_image_data_alloc(size));
+ if (!g) {
+ opj_image_data_free(r);
+ return false;
+ }
+
+ int* b = static_cast<int*>(opj_image_data_alloc(size));
+ if (!b) {
+ opj_image_data_free(r);
+ opj_image_data_free(g);
+ return false;
+ }
+
+ *out_r = r;
+ *out_g = g;
+ *out_b = b;
+ return true;
+}
+
+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;
+
+ int* r;
+ int* g;
+ int* b;
+ if (!alloc_rgb(&r, &g, &b, max_size.ValueOrDie()))
+ return;
+
+ int* d0 = r;
+ int* d1 = g;
+ int* d2 = b;
+ 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 = d0;
+ img->comps[1].data = d1;
+ img->comps[2].data = d2;
+}
+
+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;
+
+ int* r;
+ int* g;
+ int* b;
+ if (!alloc_rgb(&r, &g, &b, max_size.ValueOrDie()))
+ return;
+
+ int* d0 = r;
+ int* d1 = g;
+ int* d2 = b;
+ 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 = d0;
+ img->comps[1].data = d1;
+ img->comps[2].data = d2;
+ 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);
+
+ // FIXME: use std::make_unsigned<OPJ_OFF_T>::type once c++11 lib is OK'd.
+ uint64_t unsignedNbBytes = static_cast<uint64_t>(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 (unsignedNbBytes >
+ std::numeric_limits<OPJ_SIZE_T>::max() - srcData->offset) {
+ srcData->offset = srcData->src_size;
+ } else {
+ OPJ_SIZE_T checkedNbBytes = static_cast<OPJ_SIZE_T>(unsignedNbBytes);
+ // 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 + checkedNbBytes, 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;
+
+ // FIXME: use std::make_unsigned<OPJ_OFF_T>::type once c++11 lib is OK'd.
+ uint64_t unsignedNbBytes = static_cast<uint64_t>(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 (unsignedNbBytes > std::numeric_limits<OPJ_SIZE_T>::max()) {
+ srcData->offset = srcData->src_size;
+ } else {
+ OPJ_SIZE_T checkedNbBytes = 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(checkedNbBytes, 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 safeSize = yw;
+ safeSize *= yh;
+ safeSize *= sizeof(int);
+ if (!safeSize.IsValid())
+ return;
+
+ int* r;
+ int* g;
+ int* b;
+ if (!alloc_rgb(&r, &g, &b, safeSize.ValueOrDie()))
+ return;
+
+ int* d0 = r;
+ int* d1 = g;
+ int* d2 = b;
+ 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;
+
+ 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 = d0;
+ img->comps[1].data = d1;
+ img->comps[2].data = d2;
+ 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(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(), static_cast<unsigned int>(OPJ_J2K_STREAM_CHUNK_SIZE),
+ 1);
+ 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;
+ m_Image->pdfium_use_colorspace = !!m_ColorSpace;
+
+ 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.
+ opj_free(m_Image->icc_profile_buf);
+ 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;
+}
+
+CCodec_JpxModule::CCodec_JpxModule() {}
+
+CCodec_JpxModule::~CCodec_JpxModule() {}
+
+std::unique_ptr<CJPX_Decoder> CCodec_JpxModule::CreateDecoder(
+ const uint8_t* src_buf,
+ uint32_t src_size,
+ CPDF_ColorSpace* cs) {
+ auto decoder = pdfium::MakeUnique<CJPX_Decoder>(cs);
+ return decoder->Init(pdfium::make_span(src_buf, src_size))
+ ? std::move(decoder)
+ : nullptr;
+}
+
+void CCodec_JpxModule::GetImageInfo(CJPX_Decoder* pDecoder,
+ uint32_t* width,
+ uint32_t* height,
+ uint32_t* components) {
+ pDecoder->GetInfo(width, height, components);
+}
+
+bool CCodec_JpxModule::Decode(CJPX_Decoder* pDecoder,
+ uint8_t* dest_data,
+ uint32_t pitch,
+ const std::vector<uint8_t>& offsets) {
+ return pDecoder->Decode(dest_data, pitch, offsets);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-01-09 14:51:38 +0000