mirror of
https://github.com/pdf2htmlEX/pdf2htmlEX.git
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366 lines
9.5 KiB
C++
366 lines
9.5 KiB
C++
/*
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* state.cc
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*
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* track the current state
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*
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* by WangLu
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* 2012.08.14
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*/
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/*
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* TODO
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* optimize lines using nested <span> (reuse classes)
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*/
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#include <algorithm>
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#include "HTMLRenderer.h"
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#include "namespace.h"
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namespace pdf2htmlEX {
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using std::max;
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using std::abs;
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void HTMLRenderer::updateAll(GfxState * state)
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{
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all_changed = true;
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updateTextPos(state);
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}
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void HTMLRenderer::updateRise(GfxState * state)
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{
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rise_changed = true;
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}
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void HTMLRenderer::updateTextPos(GfxState * state)
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{
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text_pos_changed = true;
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cur_tx = state->getLineX();
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cur_ty = state->getLineY();
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}
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void HTMLRenderer::updateTextShift(GfxState * state, double shift)
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{
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text_pos_changed = true;
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cur_tx -= shift * 0.001 * state->getFontSize() * state->getHorizScaling();
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}
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void HTMLRenderer::updateFont(GfxState * state)
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{
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font_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::updateTextMat(GfxState * state)
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{
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text_mat_changed = true;
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}
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void HTMLRenderer::updateHorizScaling(GfxState * state)
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{
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hori_scale_changed = true;
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}
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void HTMLRenderer::updateCharSpace(GfxState * state)
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{
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letter_space_changed = true;
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}
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void HTMLRenderer::updateWordSpace(GfxState * state)
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{
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word_space_changed = true;
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}
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void HTMLRenderer::updateFillColor(GfxState * state)
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{
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color_changed = true;
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}
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void HTMLRenderer::check_state_change(GfxState * state)
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{
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// DEPENDENCY WARNING
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// don't adjust the order of state checking
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new_line_state = NLS_NONE;
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bool need_recheck_position = false;
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bool need_rescale_font = false;
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bool draw_scale_changed = false;
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// text position
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// we've been tracking the text position positively in the update*** functions
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if(all_changed || text_pos_changed)
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{
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need_recheck_position = true;
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}
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// font name & size
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if(all_changed || font_changed)
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{
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const FontInfo * new_font_info = install_font(state->getFont());
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if(!(new_font_info->id == cur_font_info->id))
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{
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new_line_state = max(new_line_state, NLS_DIV);
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cur_font_info = new_font_info;
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}
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double new_font_size = state->getFontSize();
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if(!_equal(cur_font_size, new_font_size))
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{
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need_rescale_font = true;
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cur_font_size = new_font_size;
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}
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}
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// backup the current ctm for need_recheck_position
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double old_ctm[6];
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memcpy(old_ctm, cur_ctm, sizeof(old_ctm));
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// ctm & text ctm & hori scale
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if(all_changed || ctm_changed || text_mat_changed || hori_scale_changed)
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{
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double new_ctm[6];
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const double * m1 = state->getCTM();
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const double * m2 = state->getTextMat();
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double hori_scale = state->getHorizScaling();
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new_ctm[0] = (m1[0] * m2[0] + m1[2] * m2[1]) * hori_scale;
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new_ctm[1] = (m1[1] * m2[0] + m1[3] * m2[1]) * hori_scale;
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new_ctm[2] = m1[0] * m2[2] + m1[2] * m2[3];
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new_ctm[3] = m1[1] * m2[2] + m1[3] * m2[3];
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new_ctm[4] = m1[0] * m2[4] + m1[2] * m2[5] + m1[4];
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new_ctm[5] = m1[1] * m2[4] + m1[3] * m2[5] + m1[5];
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//new_ctm[4] = new_ctm[5] = 0;
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if(!_tm_equal(new_ctm, cur_ctm))
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{
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need_recheck_position = true;
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need_rescale_font = true;
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memcpy(cur_ctm, new_ctm, sizeof(cur_ctm));
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}
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}
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// draw_ctm, draw_scale
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// depends: font size & ctm & text_ctm & hori scale
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if(need_rescale_font)
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{
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double new_draw_ctm[6];
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memcpy(new_draw_ctm, cur_ctm, sizeof(new_draw_ctm));
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double new_draw_scale = (param->font_size_multiplier) / (param->zoom) * sqrt(new_draw_ctm[2] * new_draw_ctm[2] + new_draw_ctm[3] * new_draw_ctm[3]);
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double new_draw_font_size = cur_font_size;
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if(_is_positive(new_draw_scale))
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{
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new_draw_font_size *= new_draw_scale;
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for(int i = 0; i < 4; ++i)
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new_draw_ctm[i] /= new_draw_scale;
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}
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else
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{
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new_draw_scale = 1.0;
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}
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if(!(_equal(new_draw_scale, draw_scale)))
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{
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draw_scale_changed = true;
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draw_scale = new_draw_scale;
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}
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if(!(_equal(new_draw_font_size, draw_font_size)))
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{
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new_line_state = max(new_line_state, NLS_SPAN);
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draw_font_size = new_draw_font_size;
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cur_fs_id = install_font_size(draw_font_size);
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}
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if(!(_tm_equal(new_draw_ctm, draw_ctm, 4)))
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{
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new_line_state = max(new_line_state, NLS_DIV);
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memcpy(draw_ctm, new_draw_ctm, sizeof(draw_ctm));
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cur_tm_id = install_transform_matrix(draw_ctm);
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}
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}
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// see if we can merge with the current line
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// depends: rise & text position & transformation
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if(need_recheck_position)
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{
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// try to transform the old origin under the new TM
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/*
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* OldTM * (draw_tx, draw_ty, 1)^T = CurTM * (draw_tx + dx, draw_ty + dy, 1)^T
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*
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* OldTM[4] = CurTM[0] * dx + CurTM[2] * dy + CurTM[4]
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* OldTM[5] = CurTM[1] * dx + CurTM[3] * dy + CurTM[5]
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*
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* We just care if we can map the origin y to the same new y
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* So just let dy = cur_y - old_y, and try to solve dx
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*
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* TODO, writing mode, set dx and solve dy
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*/
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bool merged = false;
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if(_tm_equal(old_ctm, cur_ctm, 4))
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{
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double dy = cur_ty - draw_ty;
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double tdx = old_ctm[4] - cur_ctm[4] - cur_ctm[2] * dy;
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double tdy = old_ctm[5] - cur_ctm[5] - cur_ctm[3] * dy;
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if(_equal(cur_ctm[0] * tdy, cur_ctm[1] * tdx))
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{
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if(abs(cur_ctm[0]) > EPS)
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{
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draw_tx += tdx / cur_ctm[0];
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draw_ty += dy;
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merged = true;
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}
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else if (abs(cur_ctm[1]) > EPS)
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{
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draw_tx += tdy / cur_ctm[1];
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draw_ty += dy;
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merged = true;
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}
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else
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{
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if((abs(tdx) < EPS) && (abs(tdy) < EPS))
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{
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// free
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draw_tx = cur_tx;
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draw_ty += dy;
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merged = true;
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}
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// else fail
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}
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}
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//else no solution
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}
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// else force new line
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if(!merged)
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{
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new_line_state = max(new_line_state, NLS_DIV);
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}
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}
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// letter space
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// depends: draw_scale
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if(all_changed || letter_space_changed || draw_scale_changed)
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{
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double new_letter_space = state->getCharSpace();
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if(!_equal(cur_letter_space, new_letter_space))
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{
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new_line_state = max(new_line_state, NLS_SPAN);
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cur_letter_space = new_letter_space;
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cur_ls_id = install_letter_space(cur_letter_space * draw_scale);
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}
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}
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// word space
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// depends draw_scale
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if(all_changed || word_space_changed || draw_scale_changed)
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{
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double new_word_space = state->getWordSpace();
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if(!_equal(cur_word_space, new_word_space))
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{
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new_line_state = max(new_line_state, NLS_SPAN);
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cur_word_space = new_word_space;
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cur_ws_id = install_word_space(cur_word_space * draw_scale);
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}
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}
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// color
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if(all_changed || color_changed)
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{
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GfxRGB new_color;
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state->getFillRGB(&new_color);
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if(!((new_color.r == cur_color.r) && (new_color.g == cur_color.g) && (new_color.b == cur_color.b)))
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{
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new_line_state = max(new_line_state, NLS_SPAN);
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cur_color = new_color;
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cur_color_id = install_color(&new_color);
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}
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}
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// rise
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// depends draw_scale
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if(all_changed || rise_changed || draw_scale_changed)
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{
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double new_rise = state->getRise();
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if(!_equal(cur_rise, new_rise))
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{
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new_line_state = max(new_line_state, NLS_SPAN);
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cur_rise = new_rise;
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cur_rise_id = install_rise(new_rise * draw_scale);
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}
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}
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reset_state_change();
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}
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void HTMLRenderer::reset_state_change()
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{
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all_changed = false;
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rise_changed = false;
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text_pos_changed = false;
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font_changed = false;
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ctm_changed = false;
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text_mat_changed = false;
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hori_scale_changed = false;
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letter_space_changed = false;
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word_space_changed = false;
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color_changed = false;
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}
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void HTMLRenderer::prepare_line(GfxState * state)
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{
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if(!line_opened)
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{
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new_line_state = NLS_DIV;
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}
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if(new_line_state == NLS_DIV)
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{
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close_line();
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line_buf.reset(state);
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//resync position
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draw_ty = cur_ty;
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draw_tx = cur_tx;
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}
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else
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{
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// align horizontal position
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// try to merge with the last line if possible
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double target = (cur_tx - draw_tx) * draw_scale;
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if(abs(target) < param->h_eps)
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{
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// ignore it
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}
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else
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{
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line_buf.append_offset(target);
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draw_tx += target / draw_scale;
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}
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}
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if(new_line_state != NLS_NONE)
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{
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line_buf.append_state();
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}
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line_opened = true;
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}
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void HTMLRenderer::close_line()
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{
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if(line_opened)
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{
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line_opened = false;
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line_buf.flush();
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}
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}
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} //namespace pdf2htmlEX
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