mirror of
https://github.com/pdf2htmlEX/pdf2htmlEX.git
synced 2024-12-22 04:50:09 +00:00
Improve rendering accuracy
This commit is contained in:
Lu Wang
parent
ab345ac753
commit
c7ddf60bac
@ -1,2 +1,2 @@
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Open($1);
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Generate($1:r+".otf");
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Generate($1:r+".woff");
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@ -37,6 +37,7 @@
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* p - Page
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* t - Transform
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* l - Line
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* w - White space
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*
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*
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* Reusable CSS classes
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@ -61,14 +62,14 @@ const char * HTML_HEAD = "<!DOCTYPE html>\n\
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overflow:auto;\
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background-color:grey;\
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}\
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#pdf-main .p {\
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#pdf-main > .p {\
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position:relative;\
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margin:13px auto;\
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background-color:white;\
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overflow:hidden;\
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display:none;\
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}\
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.p .t {\
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.p > .t {\
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position:absolute;\
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top:0;\
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left:0;\
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@ -80,7 +81,7 @@ const char * HTML_HEAD = "<!DOCTYPE html>\n\
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-webkit-transform-origin:0% 100%;\
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-o-transform-origin:0% 100%;\
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}\
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.t .l {\
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.t > .l {\
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position:absolute; \
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white-space:pre;\
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transform-origin:0% 100%;\
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@ -89,7 +90,7 @@ const char * HTML_HEAD = "<!DOCTYPE html>\n\
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-webkit-transform-origin:0% 100%;\
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-o-transform-origin:0% 100%;\
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}\
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.l > span{\
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.l > .w{\
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display:inline-block;\
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}\
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::selection{\
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@ -131,7 +132,8 @@ TextString::TextString(GfxState *state)
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,x(state->getCurX()), y(state->getCurY())
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,width(0),height(0)
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,state(state)
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{ }
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{
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}
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TextString::~TextString()
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{
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@ -161,8 +163,6 @@ void TextString::addChar(GfxState *state, double x, double y,
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HTMLRenderer::HTMLRenderer(const Param * param)
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:cur_string(nullptr), cur_line(nullptr)
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,cur_line_x_offset(0)
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,cur_fs_id(0), cur_fn_id(0)
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,html_fout(param->output_filename.c_str(), ofstream::binary), allcss_fout("all.css")
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,param(param)
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{
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@ -172,10 +172,6 @@ HTMLRenderer::HTMLRenderer(const Param * param)
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html_fout << HTML_HEAD;
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if(param->readable) html_fout << endl;
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for(int i = 0; i < 6; ++i)
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ctm[i] = text_mat[i] = 0.0;
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ctm[0] = text_mat[0] = ctm[3] = text_mat[3] = 1.0;
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}
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HTMLRenderer::~HTMLRenderer()
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@ -197,23 +193,35 @@ void HTMLRenderer::process(PDFDoc *doc)
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void HTMLRenderer::startPage(int pageNum, GfxState *state)
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{
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this->pageNum = pageNum;
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this->pageWidth=static_cast<int>(state->getPageWidth());
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this->pageHeight=static_cast<int>(state->getPageHeight());
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this->pageWidth = state->getPageWidth();
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this->pageHeight = state->getPageHeight();
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assert(cur_line == nullptr);
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assert(cur_string == nullptr);
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html_fout << boost::format("<div id=\"page-%3%\" class=\"p\" style=\"width:%1%px;height:%2%px;") % pageWidth % pageHeight % pageNum;
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#if 0
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// TODO:background
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html_fout << boost::format("background-image:url(p%3%.png);background-position:0 0;background-size:%1%px %2%px;background-repeat:no-repeat;") % pageWidth % pageHeight % pageNum;
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#endif
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html_fout << "\">";
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if(param->readable) html_fout << endl;
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cur_x = cur_y = 0;
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cur_fn_id = cur_fs_id = 0;
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cur_line_x_offset = 0;
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for(int i = 0; i < 6; ++i)
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cur_ctm[i] = cur_text_mat[i] = 0.0;
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cur_ctm[0] = cur_text_mat[0] = cur_ctm[3] = cur_text_mat[3] = 1.0;
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pos_changed = false;
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ctm_changed = false;
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text_mat_changed = false;
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font_changed = false;
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// default CTM
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html_fout << "<div class=\"t\">";
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html_fout << boost::format("<div class=\"t t%|1$x|\">") % install_transform_matrix(cur_ctm);
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if(param->readable) html_fout << endl;
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}
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@ -227,13 +235,6 @@ void HTMLRenderer::endPage() {
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if(param->readable) html_fout << endl;
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}
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void HTMLRenderer::convert_transform_matrix(double * tm)
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{
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tm[1] = -tm[1];
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tm[2] = -tm[2];
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tm[5] = -tm[5];
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}
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bool HTMLRenderer::at_same_line(const TextString * ts1, const TextString * ts2) const
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{
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if(!(std::abs(ts1->getY() - ts2->getY()) < param->v_eps))
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@ -301,54 +302,47 @@ void HTMLRenderer::outputTextString(TextString * str)
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}
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}
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void HTMLRenderer::updateCTM(GfxState * state, double m11, double m12, double m21, double m22, double m31, double m32)
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void HTMLRenderer::updateAll(GfxState *state)
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{
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double new_ctm[6];
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memcpy(new_ctm, state->getCTM(), sizeof(new_ctm));
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convert_transform_matrix(new_ctm);
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if(!_tm_equal(ctm, new_ctm))
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{
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close_cur_line();
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memcpy(ctm, new_ctm, sizeof(ctm));
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// close old CTM div and create a new one
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html_fout << "</div>";
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if(param->readable) html_fout << endl;
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html_fout << boost::format("<div class=\"t t%|1$x|\">") % install_transform_matrix(ctm);
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if(param->readable) html_fout << endl;
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}
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font_changed = true;
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text_mat_changed = true;
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ctm_changed = true;
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pos_changed = true;
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}
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void HTMLRenderer::updateFont(GfxState *state) {
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long long new_fn_id = install_font(state->getFont());
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long long new_fs_id = install_font_size(state->getFontSize());
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if(!((new_fn_id == cur_fn_id) && (new_fs_id == cur_fs_id)))
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void HTMLRenderer::updateFont(GfxState *state)
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{
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close_cur_line();
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cur_fn_id = new_fn_id;
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cur_fs_id = new_fs_id;
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}
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font_changed = true;
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}
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void HTMLRenderer::updateTextMat(GfxState * state)
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{
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double new_text_mat[6];
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memcpy(new_text_mat, state->getTextMat(), sizeof(new_text_mat));
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convert_transform_matrix(new_text_mat);
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if(!_tm_equal(text_mat, new_text_mat))
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{
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close_cur_line();
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memcpy(text_mat, new_text_mat, sizeof(text_mat));
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//debug
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//TODO: why
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text_mat[4] = text_mat[5] = 0.0;
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text_mat_changed = true;
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}
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void HTMLRenderer::updateCTM(GfxState * state, double m11, double m12, double m21, double m22, double m31, double m32)
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{
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ctm_changed = true;
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}
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void HTMLRenderer::updateTextPos(GfxState * state)
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{
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pos_changed = true;
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}
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void HTMLRenderer::saveTextPos(GfxState * state)
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{
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cout << "save" << endl;
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}
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void HTMLRenderer::restoreTextPos(GfxState * state)
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{
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cout << "restore" << endl;
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}
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void HTMLRenderer::beginString(GfxState *state, GooString *s) {
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check_state_change(state);
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// TODO: remove this
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GfxState * new_state = state->copy(gTrue);
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@ -377,7 +371,7 @@ void HTMLRenderer::endString(GfxState *state) {
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double w;
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auto wid = install_whitespace(target, w);
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cur_line_x_offset = w-target;
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html_fout << boost::format("<span class=\"w%|1$x|\"> </span>") % wid;
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html_fout << boost::format("<span class=\"w w%|1$x|\"> </span>") % wid;
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}
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else
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{
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@ -396,21 +390,23 @@ void HTMLRenderer::endString(GfxState *state) {
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close_cur_line();
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GfxState * cur_state = cur_string -> getState();
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// TODO: optimize text matrix search/install
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html_fout << boost::format("<div class=\"l f%|1$x| s%|2$x| t%|3$x|\" style=\"") % cur_fn_id % cur_fs_id % install_transform_matrix(text_mat)
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<< "top:" << (pageHeight - cur_string->getY()) << "px;"
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html_fout << boost::format("<div class=\"l f%|1$x| s%|2$x| t%|3$x|\" style=\"") % cur_fn_id % cur_fs_id % install_transform_matrix(cur_text_mat)
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<< "bottom:" << cur_string->getY() << "px;"
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<< "left:" << cur_string->getX() << "px;"
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// << "height:" << cur_string->getHeight() << "px;"
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<< "line-height:" << (cur_state->getFont()->getAscent() * cur_state->getFontSize()) << "px;"
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;
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// letter & word spacing
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GfxState * cur_state = cur_string -> getState();
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if(_is_positive(cur_state->getCharSpace()))
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html_fout << "letter-spacing:" << cur_state->getCharSpace() << "px;";
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if(_is_positive(cur_state->getWordSpace()))
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html_fout << "word-spacing:" << cur_state->getWordSpace() << "px;";
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//debug
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//real pos
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{
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html_fout << "\"";
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double x,y;
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@ -425,10 +421,6 @@ void HTMLRenderer::endString(GfxState *state) {
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cur_line = cur_string;
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cur_string = nullptr;
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cur_line_x_offset = 0;
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// HERE
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//debug
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// close_cur_line();
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}
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void HTMLRenderer::drawChar(GfxState *state, double x, double y,
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@ -720,7 +712,7 @@ void HTMLRenderer::install_embedded_type1_font (Ref * id, long long fn_id)
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tmpf.write(CTM, strlen(CTM));
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}
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export_remote_font(fn_id, "otf");
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export_remote_font(fn_id, "woff");
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err:
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str_obj.streamClose();
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@ -898,21 +890,91 @@ void HTMLRenderer::export_whitespace (long long ws_id, double ws_width)
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void HTMLRenderer::export_transform_matrix (long long tm_id, double * tm)
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{
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// TODO: recognize common matices
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allcss_fout << boost::format(".t%|1$x|{") % tm_id;
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// TODO: recognize common matices
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static const double id_matrix[6] = {1.0, 0.0, 0.0, 1.0, 0.0, 0.0};
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if(_tm_equal(tm, id_matrix))
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{
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// no need to output anything
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}
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else
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{
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for(const std::string & prefix : {"", "-ms-", "-moz-", "-webkit-", "-o-"})
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{
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allcss_fout << prefix << "transform:matrix(";
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for(int i = 0; i < 4; ++i)
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allcss_fout << tm[i] << ',';
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// PDF use a different coordinate system from Web
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allcss_fout << prefix << "transform:matrix("
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<< tm[0] << ','
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<< -tm[1] << ','
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<< -tm[2] << ','
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<< tm[3] << ',';
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if(prefix == "-moz-")
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allcss_fout << boost::format("%1%px,%2%px);") % tm[4] % tm[5];
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allcss_fout << boost::format("%1%px,%2%px);") % tm[4] % -tm[5];
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else
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allcss_fout << boost::format("%1%,%2%);") % tm[4] % tm[5];
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allcss_fout << boost::format("%1%,%2%);") % tm[4] % -tm[5];
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}
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}
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allcss_fout << "}";
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if(param->readable) allcss_fout << endl;
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}
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void HTMLRenderer::check_state_change(GfxState * state)
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{
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if(pos_changed)
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{
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if(!(_equal(state->getCurX(), cur_x) && _equal(state->getCurY(), cur_y)))
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{
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close_cur_line();
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cur_x = state->getCurX();
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cur_y = state->getCurY();
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}
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pos_changed = false;
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}
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if(font_changed)
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{
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long long new_fn_id = install_font(state->getFont());
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long long new_fs_id = install_font_size(state->getFontSize());
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cur_font_size = state->getFontSize();
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if(!((new_fn_id == cur_fn_id) && (new_fs_id == cur_fs_id)))
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{
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close_cur_line();
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cur_fn_id = new_fn_id;
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cur_fs_id = new_fs_id;
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}
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font_changed = false;
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}
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if(text_mat_changed)
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{
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if(!_tm_equal(cur_text_mat, state->getTextMat(), 4))
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{
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close_cur_line();
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memcpy(cur_text_mat, state->getTextMat(), sizeof(cur_text_mat));
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// we've already shift the text to the correct posstion
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// so later in css we need to ignore the these offsets
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cur_text_mat[4] = cur_text_mat[5] = 0.0;
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}
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text_mat_changed = false;
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}
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if(ctm_changed)
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{
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if(!_tm_equal(cur_ctm, state->getCTM()))
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{
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close_cur_line();
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memcpy(cur_ctm, state->getCTM(), sizeof(cur_ctm));
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// close old CTM div and create a new one
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html_fout << "</div>";
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if(param->readable) html_fout << endl;
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html_fout << boost::format("<div class=\"t t%|1$x|\">") % install_transform_matrix(cur_ctm);
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if(param->readable) html_fout << endl;
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}
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ctm_changed = false;
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}
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}
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@ -35,9 +35,9 @@ using namespace std;
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static const double EPS = 1e-6;
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inline bool _equal(double x, double y) { return std::abs(x-y) < EPS; }
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inline bool _is_positive(double x) { return x > EPS; }
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inline bool _tm_equal(const double * tm1, const double * tm2)
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inline bool _tm_equal(const double * tm1, const double * tm2, int size = 6)
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{
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for(int i = 0; i < 6; ++i)
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for(int i = 0; i < size; ++i)
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if(!_equal(tm1[i], tm2[i]))
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return false;
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return true;
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@ -55,7 +55,6 @@ class TextString
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Unicode u);
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double getX() const {return x;}
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double getY() const {return y;}
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double getWidth() const {return width;}
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double getHeight() const {return height;}
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@ -100,7 +99,6 @@ class HTMLRenderer : public OutputDev
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virtual GBool needNonText() { return gFalse; }
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//----- initialization and control
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virtual GBool checkPageSlice(Page *page, double hDPI, double vDPI,
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int rotate, GBool useMediaBox, GBool crop,
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int sliceX, int sliceY, int sliceW, int sliceH,
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@ -121,9 +119,13 @@ class HTMLRenderer : public OutputDev
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virtual void endPage();
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//----- update state
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virtual void updateCTM(GfxState * state, double m11, double m12, double m21, double m22, double m31, double m32);
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virtual void updateAll(GfxState * state);
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virtual void updateFont(GfxState * state);
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virtual void updateTextMat(GfxState * state);
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virtual void updateCTM(GfxState * state, double m11, double m12, double m21, double m22, double m31, double m32);
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virtual void updateTextPos(GfxState * state);
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virtual void saveTextPos(GfxState * state);
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virtual void restoreTextPos(GfxState * state);
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//----- text drawing
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virtual void beginString(GfxState *state, GooString *s);
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@ -138,9 +140,6 @@ class HTMLRenderer : public OutputDev
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private:
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bool at_same_line(const TextString * ts1, const TextString * ts2) const;
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// CSS use a different coordinate system from PDF
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void convert_transform_matrix(double * tm);
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void close_cur_line();
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void outputTextString(TextString * str);
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@ -176,11 +175,18 @@ class HTMLRenderer : public OutputDev
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// page info
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int pageNum ;
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int pageWidth ;
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int pageHeight ;
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double pageWidth ;
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double pageHeight ;
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// state maintained when processing pdf
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void check_state_change(GfxState * state);
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// current position
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double cur_x, cur_y;
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bool pos_changed;
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// the string being processed
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TextString * cur_string;
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// the last word of current line
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@ -188,8 +194,17 @@ class HTMLRenderer : public OutputDev
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TextString * cur_line;
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// (actual x) - (supposed x)
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double cur_line_x_offset;
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double ctm[6], text_mat[6];
|
||||
long long cur_fs_id, cur_fn_id;
|
||||
|
||||
double cur_ctm[6];
|
||||
bool ctm_changed;
|
||||
|
||||
double cur_text_mat[6];
|
||||
bool text_mat_changed;
|
||||
|
||||
long long cur_fn_id;
|
||||
double cur_font_size;
|
||||
long long cur_fs_id;
|
||||
bool font_changed;
|
||||
|
||||
|
||||
ofstream html_fout, allcss_fout;
|
||||
|
||||
@ -124,7 +124,6 @@ po::variables_map parse_options (int argc, char **argv)
|
||||
("hdpi", po::value<double>(¶m.h_dpi)->default_value(72.0), "horizontal DPI")
|
||||
("vdpi", po::value<double>(¶m.v_dpi)->default_value(72.0), "vertical DPI")
|
||||
("heps", po::value<double>(¶m.h_eps)->default_value(1.0), "max tolerated horizontal offset (in pixels)")
|
||||
("heps", po::value<double>(¶m.h_eps)->default_value(1.0), "max tolerated horizontal offset (in pixels)")
|
||||
("veps", po::value<double>(¶m.v_eps)->default_value(1.0), "max tolerated vertical offset (in pixels)")
|
||||
("readable", po::value<int>(¶m.readable)->default_value(0), "make the ouptut human readable")
|
||||
;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user