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core/DjVuFile/wasm/djvu_common.cpp
Kulikova Svetlana f862f962e0 djvu glyphs
2021-07-27 18:10:51 +03:00

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// djvu wrapper
#include "../libdjvu/DjVuDocument.h"
#include "../libdjvu/DjVuImage.h"
#include "../libdjvu/GBitmap.h"
#include "../libdjvu/GScaler.h"
#include "../libdjvu/IFFByteStream.h"
#include "../libdjvu/BSByteStream.h"
#include "../libdjvu/DataPool.h"
#include "../libdjvu/DjVuText.h"
#include "../libdjvu/DjVmNav.h"
#include "../libdjvu/IW44Image.h"
class CDjvuFile
{
public:
GP<DjVuDocument> m_doc;
};
class CData
{
protected:
unsigned char* m_pData;
size_t m_lSize;
unsigned char* m_pDataCur;
size_t m_lSizeCur;
public:
CData()
{
m_pData = NULL;
m_lSize = 0;
m_pDataCur = m_pData;
m_lSizeCur = m_lSize;
}
virtual ~CData()
{
Clear();
}
inline void AddSize(size_t nSize)
{
if (NULL == m_pData)
{
m_lSize = 1000;
if (nSize > m_lSize)
m_lSize = nSize;
m_pData = (unsigned char*)malloc(m_lSize * sizeof(unsigned char));
m_lSizeCur = 0;
m_pDataCur = m_pData;
return;
}
if ((m_lSizeCur + nSize) > m_lSize)
{
while ((m_lSizeCur + nSize) > m_lSize)
m_lSize *= 2;
unsigned char* pRealloc = (unsigned char*)realloc(m_pData, m_lSize * sizeof(unsigned char));
if (NULL != pRealloc)
{
m_pData = pRealloc;
m_pDataCur = m_pData + m_lSizeCur;
}
else
{
unsigned char* pMalloc = (unsigned char*)malloc(m_lSize * sizeof(unsigned char));
memcpy(pMalloc, m_pData, m_lSizeCur * sizeof(unsigned char));
free(m_pData);
m_pData = pMalloc;
m_pDataCur = m_pData + m_lSizeCur;
}
}
}
public:
void AddInt(unsigned int value)
{
AddSize(4);
memcpy(m_pDataCur, &value, sizeof(unsigned int));
m_pDataCur += 4;
m_lSizeCur += 4;
}
void WriteString(unsigned char* value, unsigned int len)
{
AddSize(len + 4);
memcpy(m_pDataCur, &len, sizeof(unsigned int));
m_pDataCur += 4;
m_lSizeCur += 4;
memcpy(m_pDataCur, value, len);
m_pDataCur += len;
m_lSizeCur += len;
}
unsigned char* GetBuffer()
{
return m_pData;
}
void Clear()
{
if (m_pData) free(m_pData);
m_pData = NULL;
m_lSize = 0;
m_pDataCur = m_pData;
m_lSizeCur = 0;
}
void ClearWithoutAttack()
{
m_pData = NULL;
m_lSize = 0;
m_pDataCur = m_pData;
m_lSizeCur = 0;
}
void ClearNoAttack()
{
m_pDataCur = m_pData;
m_lSizeCur = 0;
}
unsigned int GetSize()
{
return (unsigned int)m_lSizeCur;
}
void SkipLen()
{
AddInt(0);
}
void WriteLen()
{
unsigned int len = (unsigned int)m_lSizeCur;
memcpy(m_pData, &len, sizeof(unsigned int));
}
};
extern "C"
{
CDjvuFile* DJVU_Load(unsigned char* pData, unsigned int len);
void DJVU_Close(CDjvuFile* file);
int* DJVU_GetInfo(CDjvuFile* file);
unsigned char* DJVU_GetPixmap(CDjvuFile* file, int page_index, int w, int h);
unsigned char* DJVU_GetGlyphs(CDjvuFile* file);
unsigned char* DJVU_GetStructure(CDjvuFile* file);
void DJVU_Delete(unsigned char* pData);
}
CDjvuFile* DJVU_Load(unsigned char* pData, unsigned int len)
{
GP<ByteStream> stream = ByteStream::create(pData, (size_t)len);
CDjvuFile* file = new CDjvuFile();
file->m_doc = DjVuDocument::create(stream);
file->m_doc->wait_get_pages_num();
int pages_count = file->m_doc->get_pages_num();
if (0 == pages_count)
{
delete file;
return NULL;
}
return file;
}
void DJVU_Close(CDjvuFile* file)
{
delete file;
}
int* DJVU_GetInfo(CDjvuFile* file)
{
int pages_count = file->m_doc->get_pages_num();
int* buffer = new int[pages_count * 3 + 1];
int buffer_index = 0;
buffer[buffer_index++] = pages_count;
for (int page = 0; page < pages_count; ++page)
{
int nW = 0;
int nH = 0;
int nDpi = 0;
file->m_doc->ReadPageInfo(page, nW, nH, nDpi);
buffer[buffer_index++] = nW;
buffer[buffer_index++] = nH;
buffer[buffer_index++] = nDpi;
}
return buffer;
}
unsigned char* DJVU_GetPixmap(CDjvuFile* file, int page_index, int w, int h)
{
GP<DjVuImage> page = file->m_doc->get_page(page_index);
int w_real = page->get_real_width();
int h_real = page->get_real_height();
unsigned char* pixmap = new unsigned char[4 * w * h];
if (!pixmap)
return NULL;
if (page->is_legal_photo() || page->is_legal_compound())
{
GRect oRectAll(0, 0, w, h);
GP<GPixmap> pImage = page->get_pixmap(oRectAll, oRectAll);
unsigned char* pixmap_cur = pixmap;
for (int j = h - 1; j >= 0; --j)
{
GPixel* pLine = pImage->operator [](j);
for (int i = 0; i < w; ++i, pixmap_cur += 4, ++pLine)
{
pixmap_cur[0] = pLine->r;
pixmap_cur[1] = pLine->g;
pixmap_cur[2] = pLine->b;
pixmap_cur[3] = 255;
}
}
}
else if (page->is_legal_bilevel())
{
GRect oRectAll(0, 0, w, h);
GP<GBitmap> pBitmap = page->get_bitmap(oRectAll, oRectAll, 4);
int nPaletteEntries = pBitmap->get_grays();
unsigned int* palette = new unsigned int[nPaletteEntries];
// Create palette for the bitmap
int color = 0xff0000;
int decrement = color / (nPaletteEntries - 1);
for (int i = 0; i < nPaletteEntries; ++i)
{
unsigned char level = (unsigned char)(color >> 16);
palette[i] = (0xFF000000 | level << 16 | level << 8 | level);
color -= decrement;
}
unsigned int* pixmap_cur = (unsigned int*)pixmap;
for (int j = h - 1; j >= 0; --j)
{
unsigned char* pLine = pBitmap->operator [](j);
for (int i = 0; i < w; ++i, ++pixmap_cur, ++pLine)
{
if (*pLine < nPaletteEntries)
{
*pixmap_cur = palette[*pLine];
}
else
{
*pixmap_cur = palette[0];
}
}
}
delete [] palette;
}
else
{
GRect oRectAll(0, 0, w, h);
GP<GPixmap> pImage = page->get_pixmap(oRectAll, oRectAll);
if (NULL != pImage)
{
unsigned char* pixmap_cur = pixmap;
for (int j = h - 1; j >= 0; --j)
{
GPixel* pLine = pImage->operator [](j);
for (int i = 0; i < w; ++i, pixmap_cur += 4, ++pLine)
{
pixmap_cur[0] = pLine->r;
pixmap_cur[1] = pLine->g;
pixmap_cur[2] = pLine->b;
pixmap_cur[3] = 255;
}
}
}
else
{
GP<GBitmap> pBitmap = page->get_bitmap(oRectAll, oRectAll, 4);
if (NULL != pBitmap)
{
int nPaletteEntries = pBitmap->get_grays();
unsigned int* palette = new unsigned int[nPaletteEntries];
// Create palette for the bitmap
int color = 0xff0000;
int decrement = color / (nPaletteEntries - 1);
for (int i = 0; i < nPaletteEntries; ++i)
{
unsigned char level = (unsigned char)(color >> 16);
palette[i] = (0xFF000000 | level << 16 | level << 8 | level);
color -= decrement;
}
unsigned int* pixmap_cur = (unsigned int*)pixmap;
for (int j = h - 1; j >= 0; --j)
{
unsigned char* pLine = pBitmap->operator [](j);
for (int i = 0; i < w; ++i, ++pixmap_cur, ++pLine)
{
if (*pLine < nPaletteEntries)
{
*pixmap_cur = palette[*pLine];
}
else
{
*pixmap_cur = palette[0];
}
}
}
delete [] palette;
}
}
}
return pixmap;
}
unsigned char* DJVU_GetGlyphs(CDjvuFile* file, int page_index)
{
GP<DjVuImage> pPage = file->m_doc->get_page(page_index);
GP<DjVuText> text(DjVuText::create());
GP<ByteStream> text_str(pPage->get_text());
if (text_str)
{
text->decode(text_str);
GUTF8String pageText = text->get_xmlText(pPage->get_height());
}
return NULL;
}
void getBookmars(const GP<DjVmNav>& nav, int& pos, int count, CData& out, int level)
{
while (count > 0 && pos < nav->getBookMarkCount())
{
GP<DjVmNav::DjVuBookMark> gpBookMark;
nav->getBookMark(gpBookMark, pos++);
GUTF8String str = gpBookMark->url;
int endpos;
unsigned long nPage = str.toULong(1, endpos);
if (endpos == (int)str.length())
{
out.AddInt(nPage);
out.AddInt(level);
GUTF8String description = gpBookMark->displayname;
out.WriteString((unsigned char*)description.getbuf(), description.length());
}
getBookmars(nav, pos, gpBookMark->count, out, level + 1);
count--;
}
}
unsigned char* DJVU_GetStructure(CDjvuFile* file)
{
GP<DjVmNav> nav = file->m_doc->get_djvm_nav();
if (!nav)
return NULL;
int pos = 0;
int count = nav->getBookMarkCount();
if (count <= 0)
return NULL;
CData oRes;
oRes.SkipLen();
getBookmars(nav, pos, count, oRes, 1);
oRes.WriteLen();
unsigned char* bRes = oRes.GetBuffer();
oRes.ClearWithoutAttack();
return bRes;
}
void DJVU_Delete(unsigned char* pData)
{
delete [] pData;
}
#ifdef WASM_MODE_DEBUG
#include <stdio.h>
#include <string>
#include <iostream>
int main(int argc, char *argv[])
{
FILE* f = fopen("D:\\1.djvu", "rb");
fseek(f, 0, SEEK_END);
int file_size = (int)ftell(f);
fseek(f, 0, SEEK_SET);
unsigned char* file_data = new unsigned char[file_size];
fread((void*)file_data, 1, file_size, f);
fclose(f);
CDjvuFile* file = DJVU_Load(file_data, file_size);
delete [] file_data;
if (file)
{
int* info = DJVU_GetInfo(file);
int pages_count = *info;
if (pages_count > 0)
{
unsigned char* pixmap = DJVU_GetPixmap(file, 0, info[1] * 96 / info[3], info[2] * 96 / info[3]);
delete [] pixmap;
}
delete [] info;
unsigned char* pStructure = DJVU_GetStructure(file);
unsigned nLength = pStructure[0] | pStructure[1] << 8 | pStructure[2] << 16 | pStructure[3] << 24;
unsigned i = 4;
nLength -= 4;
while (i < nLength)
{
unsigned nPathLength = (pStructure + i)[0] | (pStructure + i)[1] << 8 | (pStructure + i)[2] << 16 | (pStructure + i)[3] << 24;
i += 4;
std::cout << "Page " << nPathLength << ", ";
nPathLength = (pStructure + i)[0] | (pStructure + i)[1] << 8 | (pStructure + i)[2] << 16 | (pStructure + i)[3] << 24;
i += 4;
std::cout << "Level " << nPathLength << ", ";
nPathLength = (pStructure + i)[0] | (pStructure + i)[1] << 8 | (pStructure + i)[2] << 16 | (pStructure + i)[3] << 24;
i += 4;
std::string oDs = std::string((char*)(pStructure + i), nPathLength);
std::cout << "Description " << oDs << std::endl;
i += nPathLength;
}
delete [] pStructure;
}
return 0;
}
#endif
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