DenysMedvid/pdf2htmlEX
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improve ascent/descent for type 3 fonts

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This commit is contained in:
Lu Wang 2013-09-20 16:35:19 +08:00
parent 8812bb52fb
commit 09856c0910
6 changed files with 74 additions and 49 deletions
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33
src/HTMLRenderer/font.cc
View File

@ -58,6 +58,7 @@ string HTMLRenderer::dump_embedded_font (GfxFont * font, FontInfo & info)
string filepath;
long long fn_id = info.id;
info.font_size_scale = 1.0;
try
{
@ -195,13 +196,17 @@ string HTMLRenderer::dump_type3_font (GfxFont * font, FontInfo & info)
auto * cur_font = font_engine.getFont(font, cur_doc, true, xref);
auto used_map = preprocessor.get_code_map(hash_ref(font->getID()));
//calculate transformed metrics
double * font_bbox = font->getFontBBox();
// TODO: font matrix may not exists
double * font_matrix = font->getFontMatrix();
//calculate transformations
double transformed_bbox[4];
memcpy(transformed_bbox, font_bbox, 4 * sizeof(double));
// add the origin to the bbox
if(transformed_bbox[0] > 0) transformed_bbox[0] = 0;
if(transformed_bbox[1] > 0) transformed_bbox[1] = 0;
if(transformed_bbox[2] < 0) transformed_bbox[2] = 0;
if(transformed_bbox[3] < 0) transformed_bbox[3] = 0;
tm_transform_bbox(font_matrix, transformed_bbox);
double transformed_bbox_width = transformed_bbox[2] - transformed_bbox[0];
double transformed_bbox_height = transformed_bbox[3] - transformed_bbox[1];
@ -212,10 +217,10 @@ string HTMLRenderer::dump_type3_font (GfxFont * font, FontInfo & info)
std::cerr << std::endl;
// we want the glyphs is rendered in a box of size around 100 x 100
// for rectangles, the longer edge should be 100
info.type3_font_size_scale = std::max(transformed_bbox_width, transformed_bbox_height);
info.font_size_scale = std::max(transformed_bbox_width, transformed_bbox_height);
const double GLYPH_DUMP_SIZE = 100.0;
double scale = GLYPH_DUMP_SIZE / info.type3_font_size_scale;
double scale = GLYPH_DUMP_SIZE / info.font_size_scale;
// determine the position of the origin of the glyph
double ox, oy;
@ -224,9 +229,11 @@ string HTMLRenderer::dump_type3_font (GfxFont * font, FontInfo & info)
ox -= transformed_bbox[0];
oy -= transformed_bbox[1];
// dump each glyph into svg and combine them
// we choose ttf as it does not use char names
// or actually we don't use char names for ttf (see embed_font)
ffw_new_font();
ffw_set_metric(transformed_bbox[3] / transformed_bbox_height, transformed_bbox[1] / transformed_bbox_height);
// dump each glyph into svg and combine them
for(int code = 0; code < 256; ++code)
{
if(!used_map[code]) continue;
@ -331,8 +338,6 @@ string HTMLRenderer::dump_type3_font (GfxFont * font, FontInfo & info)
ffw_import_svg_glyph(code, glyph_filename.c_str());
}
// we choose ttf as it does not use char names
// or actually we don't use char names for ttf (see embed_font)
string font_filename = (char*)str_fmt("%s/f%llx.ttf", param.tmp_dir.c_str(), fn_id);
tmp_files.add(font_filename);
ffw_save(font_filename.c_str());
@ -400,7 +405,8 @@ void HTMLRenderer::embed_font(const string & filepath, GfxFont * font, FontInfo
if(get_metric_only)
{
ffw_metric(&info.ascent, &info.descent);
ffw_fix_metric();
ffw_get_metric(&info.ascent, &info.descent);
ffw_close();
return;
}
@ -647,8 +653,7 @@ void HTMLRenderer::embed_font(const string & filepath, GfxFont * font, FontInfo
cur_width = font_cid->getWidth(buf, 2) ;
}
if(info.is_type3)
cur_width /= info.type3_font_size_scale;
cur_width /= info.font_size_scale;
if(u == ' ')
{
@ -693,8 +698,7 @@ void HTMLRenderer::embed_font(const string & filepath, GfxFont * font, FontInfo
char buf[2] = {0, ' '};
info.space_width = font_cid->getWidth(buf, 2);
}
if(info.is_type3)
info.space_width /= info.type3_font_size_scale;
info.space_width /= info.font_size_scale;
/* See comments above */
if(equal(info.space_width,0))
@ -777,7 +781,8 @@ void HTMLRenderer::embed_font(const string & filepath, GfxFont * font, FontInfo
tmp_files.add(fn);
ffw_load_font(cur_tmp_fn.c_str());
ffw_metric(&info.ascent, &info.descent);
ffw_fix_metric();
ffw_get_metric(&info.ascent, &info.descent);
if(param.override_fstype)
ffw_override_fstype();
ffw_save(fn.c_str());

5
src/HTMLRenderer/state.cc
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@ -274,11 +274,6 @@ void HTMLRenderer::check_state_change(GfxState * state)
double new_draw_font_size = cur_font_size;
if(cur_text_state.font_info->is_type3 && param.process_type3)
{
new_draw_font_size *= cur_text_state.font_info->type3_font_size_scale;
}
if(is_positive(new_draw_text_scale))
{
// scale both font size and matrix

6
src/HTMLState.h
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@ -26,9 +26,11 @@ struct FontInfo
* we have to scale the font to about 1,
* then apply the scaling when using the font
*
* The scaling factor is stored as type3_font_size_scale
* The scaling factor is stored as font_size_scale
*
* The value is 1 for other fonts
*/
double type3_font_size_scale;
double font_size_scale;
};
struct HTMLTextState

12
src/HTMLTextLine.cc
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@ -60,7 +60,10 @@ void HTMLTextLine::append_state(const HTMLTextState & text_state)
states.back().hash_umask = 0;
}
(HTMLTextState&)(states.back()) = text_state;
HTMLTextState & last_state = states.back();
last_state = text_state;
//apply font scale
last_state.font_size *= last_state.font_info->font_size_scale;
}
void HTMLTextLine::dump_text(ostream & out)
@ -251,7 +254,8 @@ void HTMLTextLine::prepare(void)
// note that vertical_align cannot be calculated here
for(auto iter = states.begin(); iter != states.end(); ++iter)
{
iter->ids[State::FONT_ID] = iter->font_info->id;
auto font_info = iter->font_info;
iter->ids[State::FONT_ID] = font_info->id;
iter->ids[State::FONT_SIZE_ID] = all_manager.font_size.install(iter->font_size);
iter->ids[State::FILL_COLOR_ID] = all_manager.fill_color.install(iter->fill_color);
iter->ids[State::STROKE_COLOR_ID] = all_manager.stroke_color.install(iter->stroke_color);
@ -260,10 +264,10 @@ void HTMLTextLine::prepare(void)
iter->hash();
accum_vertical_align += iter->vertical_align;
double cur_ascent = accum_vertical_align + iter->font_info->ascent * iter->font_size;
double cur_ascent = accum_vertical_align + font_info->ascent * iter->font_size;
if(cur_ascent > ascent)
ascent = cur_ascent;
double cur_descent = accum_vertical_align + iter->font_info->descent * iter->font_size;
double cur_descent = accum_vertical_align + font_info->descent * iter->font_size;
if(cur_descent < descent)
descent = cur_descent;
}

57
src/util/ffw.c
View File

@ -302,29 +302,22 @@ int ffw_get_em_size(void)
return cur_fv->sf->ascent + cur_fv->sf->descent;
}
void ffw_metric(double * ascent, double * descent)
void ffw_fix_metric()
{
double ascent, descent;
ffw_get_metric(&ascent, &descent);
//debug
printf("fix metrix: %lf %lf\n", ascent, descent);
ffw_set_metric(ascent, descent);
}
void ffw_get_metric(double * ascent, double * descent)
{
SplineFont * sf = cur_fv->sf;
struct pfminfo * info = &sf->pfminfo;
SFDefaultOS2Info(info, sf, sf->fontname);
info->pfmset = 1;
sf->changed = 1;
DBounds bb;
SplineFontFindBounds(sf, &bb);
/*
printf("bb %lf %lf\n", bb.maxy, bb.miny);
printf("_ %d %d\n", sf->ascent, sf->descent);
printf("win %d %d\n", info->os2_winascent, info->os2_windescent);
printf("%d %d\n", info->winascent_add, info->windescent_add);
printf("typo %d %d\n", info->os2_typoascent, info->os2_typodescent);
printf("%d %d\n", info->typoascent_add, info->typodescent_add);
printf("hhead %d %d\n", info->hhead_ascent, info->hhead_descent);
printf("%d %d\n", info->hheadascent_add, info->hheaddescent_add);
*/
int em = sf->ascent + sf->descent;
if (em > 0)
@ -336,10 +329,21 @@ void ffw_metric(double * ascent, double * descent)
{
*ascent = *descent = 0;
}
}
void ffw_set_metric(double ascent, double descent)
{
SplineFont * sf = cur_fv->sf;
struct pfminfo * info = &sf->pfminfo;
SFDefaultOS2Info(info, sf, sf->fontname);
info->pfmset = 1;
sf->changed = 1;
int em = sf->ascent + sf->descent;
int a = floor(ascent * em + 0.5);
int d = floor(descent * em + 0.5);
int a = floor(bb.maxy + 0.5);
int d = floor(bb.miny + 0.5);
if(a < 0) a = 0;
if(d > 0) d = 0;
@ -354,7 +358,6 @@ void ffw_metric(double * ascent, double * descent)
* But have to unify them, for different browsers on different platforms
* Things may become easier when there are CSS rules for baseline-based positioning.
*/
info->os2_winascent = a;
info->os2_typoascent = a;
info->hhead_ascent = a;
@ -430,13 +433,23 @@ void ffw_import_svg_glyph(int code, const char * filename)
if(enc == -1)
return;
SFMakeChar(cur_fv->sf, cur_fv->map, enc);
SplineChar * sc = SFMakeChar(cur_fv->sf, cur_fv->map, enc);
memset(cur_fv->selected, 0, cur_fv->map->enccount);
cur_fv->selected[enc] = 1;
int ok = FVImportImages(cur_fv, (char*)filename, fv_svg, 0, -1);
if(!ok)
err("Import SVG glyph failed");
// correct the origin
{
real transform[6];
transform[0] = 1.0;
transform[3] = 1.0;
transform[1] = transform[2] = transform[4];
transform[5] = cur_fv->sf->descent;
FVTrans(cur_fv, sc, transform, NULL, fvt_alllayers | fvt_dontmovewidth);
}
}
void ffw_auto_hint(void)

10
src/util/ffw.h
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@ -48,8 +48,14 @@ void ffw_add_empty_char(int32_t unicode, int width);
////////////////////////
// metrics
int ffw_get_em_size(void);
// fix metrics and get them
void ffw_metric(double * ascent, double * descent);
// manipulate ascent and descent
// asscent is between 0 and 1
// descent is between -1 and 0
void ffw_fix_metric();
// get ascent/descent based on the shape
void ffw_get_metric(double * ascent, double * descent);
// set corresponding fields
void ffw_set_metric(double ascent, double descent);
void ffw_set_widths(int * width_list, int mapping_len,
int stretch_narrow, int squeeze_wide);