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[pdfrenderer] Add some debugging capabilities. Do not compress symbol table and text data during debug.

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This commit is contained in:
Egor Pugin 2024-02-23 23:49:40 +03:00
parent b8961a7375
commit 94bd98b7ef
2 changed files with 69 additions and 28 deletions
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6
include/tesseract/renderer.h
View File

@ -139,6 +139,12 @@ protected:
// This method will grow the output buffer if needed.
void AppendData(const char *s, int len);
template <typename T>
auto AppendData(T &&d) {
AppendData(d.data(), d.size());
return d.size();
}
private:
TessResultRenderer *next_; // Can link multiple renderers together
FILE *fout_; // output file pointer

91
src/api/pdfrenderer.cpp
View File

@ -34,6 +34,16 @@
#include <locale> // for std::locale::classic
#include <memory> // std::unique_ptr
#include <sstream> // for std::stringstream
#include <string_view>
using namespace std::literals;
#ifndef NDEBUG
#define DEBUG_PDF
#endif
#ifdef DEBUG_PDF
#define NO_PDF_COMPRESSION
#endif
/*
@ -443,6 +453,9 @@ char *TessPDFRenderer::GetPDFTextObjects(TessBaseAPI *api, double width, double
if (fontsize != old_fontsize) {
pdf_str << "/f-0-0 " << fontsize << " Tf ";
old_fontsize = fontsize;
#ifdef DEBUG_PDF
pdf_str << "\n";
#endif
}
}
@ -469,9 +482,13 @@ char *TessPDFRenderer::GetPDFTextObjects(TessBaseAPI *api, double width, double
}
if (word_length > 0 && pdf_word_len > 0) {
double h_stretch = kCharWidth * prec(100.0 * word_length / (fontsize * pdf_word_len));
pdf_str << h_stretch << " Tz" // horizontal stretch
<< " [ <" << pdf_word // UTF-16BE representation
<< "> ] TJ"; // show the text
pdf_str << h_stretch << " Tz"; // horizontal stretch
pdf_str
<< " [ <" << pdf_word // UTF-16BE representation
<< "> ] TJ"; // show the text
#ifdef DEBUG_PDF
pdf_str << "\n";
#endif
}
if (last_word_in_line) {
pdf_str << " \n";
@ -545,26 +562,36 @@ bool TessPDFRenderer::BeginDocumentHandler() {
for (int i = 0; i < kCIDToGIDMapSize; i++) {
cidtogidmap[i] = (i % 2) ? 1 : 0;
}
size_t len;
unsigned char *comp = zlibCompress(cidtogidmap.get(), kCIDToGIDMapSize, &len);
size_t len = kCIDToGIDMapSize;
#ifndef NO_PDF_COMPRESSION
auto comp = zlibCompress(cidtogidmap.get(), kCIDToGIDMapSize, &len);
#endif
stream.str("");
stream << "5 0 obj\n"
"<<\n"
" /Length "
<< len
<< " /Filter /FlateDecode\n"
<< ""
#ifndef NO_PDF_COMPRESSION
" /Filter /FlateDecode"
#endif
"\n"
">>\n"
"stream\n";
"stream\n"
;
AppendString(stream.str().c_str());
long objsize = stream.str().size();
#ifndef NO_PDF_COMPRESSION
AppendData(reinterpret_cast<char *>(comp), len);
#else
AppendData(reinterpret_cast<char *>(cidtogidmap.get()), len);
#endif
objsize += len;
#ifndef NO_PDF_COMPRESSION
lept_free(comp);
const char *endstream_endobj =
"endstream\n"
"endobj\n";
AppendString(endstream_endobj);
objsize += strlen(endstream_endobj);
#endif
objsize += AppendData("endstream\n"sv);
objsize += AppendData("endobj\n"sv);
AppendPDFObjectDIY(objsize);
const char stream2[] =
@ -654,8 +681,8 @@ bool TessPDFRenderer::BeginDocumentHandler() {
objsize = stream.str().size();
AppendData(reinterpret_cast<const char *>(font), size);
objsize += size;
AppendString(endstream_endobj);
objsize += strlen(endstream_endobj);
objsize += AppendData("endstream\n"sv);
objsize += AppendData("endobj\n"sv);
AppendPDFObjectDIY(objsize);
return true;
}
@ -848,29 +875,37 @@ bool TessPDFRenderer::AddImageHandler(TessBaseAPI *api) {
// CONTENTS
const std::unique_ptr<char[]> pdftext(GetPDFTextObjects(api, width, height));
const size_t pdftext_len = strlen(pdftext.get());
size_t len;
unsigned char *comp_pdftext =
zlibCompress(reinterpret_cast<unsigned char *>(pdftext.get()), pdftext_len, &len);
long comp_pdftext_len = len;
size_t len = pdftext_len;
#ifndef NO_PDF_COMPRESSION
auto comp_pdftext = zlibCompress(reinterpret_cast<unsigned char *>(pdftext.get()), pdftext_len, &len);
#endif
stream.str("");
stream << obj_
<< " 0 obj\n"
"<<\n"
" /Length "
<< comp_pdftext_len
<< " /Filter /FlateDecode\n"
<< len
<< ""
#ifndef NO_PDF_COMPRESSION
" /Filter /FlateDecode"
#endif
"\n"
">>\n"
"stream\n";
"stream\n"
;
AppendString(stream.str().c_str());
long objsize = stream.str().size();
AppendData(reinterpret_cast<char *>(comp_pdftext), comp_pdftext_len);
objsize += comp_pdftext_len;
#ifndef NO_PDF_COMPRESSION
AppendData(reinterpret_cast<char *>(comp_pdftext), len);
#else
AppendData(reinterpret_cast<char *>(pdftext.get()), len);
#endif
objsize += len;
#ifndef NO_PDF_COMPRESSION
lept_free(comp_pdftext);
const char *b2 =
"endstream\n"
"endobj\n";
AppendString(b2);
objsize += strlen(b2);
#endif
objsize += AppendData("endstream\n"sv);
objsize += AppendData("endobj\n"sv);
AppendPDFObjectDIY(objsize);
if (!textonly_) {