kerning table fixes

[swftools.git] / lib / pdf / InfoOutputDev.cc

diff --git a/lib/pdf/InfoOutputDev.cc b/lib/pdf/InfoOutputDev.cc
index affad69..ba151a1 100644 (file)
--- a/lib/pdf/InfoOutputDev.cc
+++ b/lib/pdf/InfoOutputDev.cc
@@ -15,6 +15,8 @@
 #endif
 #include "GfxState.h"
 #include "../log.h"
+#include "../types.h"
+#include "../q.h"
 #include <math.h>
 #include <assert.h>
 
@@ -51,21 +53,24 @@ InfoOutputDev::~InfoOutputDev()
     delete id2font;id2font=0;
     delete splash;splash=0;
 }
+
 void FontInfo::grow(int size)
 {
     if(size >= this->num_glyphs) {
        this->glyphs = (GlyphInfo**)realloc(this->glyphs, sizeof(GlyphInfo*)*(size));
+       this->kerning = (dict_t**)realloc(this->kerning, sizeof(dict_t*)*(size));
        memset(&this->glyphs[this->num_glyphs], 0, sizeof(SplashPath*)*((size)-this->num_glyphs));
+       memset(&this->kerning[this->num_glyphs], 0, sizeof(dict_t*)*((size)-this->num_glyphs));
        this->num_glyphs = size;
     }
 }
 FontInfo::FontInfo(char*id)
 {
     this->id = strdup(id);
-    this->charid2glyph = 0;
     this->seen = 0;
     this->num_glyphs = 0;
     this->glyphs = 0;
+    this->kerning = 0;
     this->splash_font = 0;
     this->lastchar = -1;
     this->lastx = 0;
@@ -77,10 +82,6 @@ FontInfo::~FontInfo()
 {
     if(this->id) {free(this->id);this->id=0;}
     this->font = 0;
-    if(this->charid2glyph) {
-       free(this->charid2glyph);
-       this->charid2glyph = 0;
-    }
     int t;
     for(t=0;t<num_glyphs;t++) {
        if(glyphs[t]) {
@@ -92,6 +93,17 @@ FontInfo::~FontInfo()
     free(glyphs);glyphs=0;
     if(this->gfxfont)
         gfxfont_free(this->gfxfont);
+   
+    if(kerning) {
+       for(t=0;t<num_glyphs;t++) {
+           dict_t* d = kerning[t];
+           if(!d) continue;
+           DICT_ITERATE_ITEMS(d,void*,key,mtf_t*,m) {
+               mtf_destroy(m);
+           }
+           dict_destroy(d);
+       }
+    }
 }
 
 static int findSpace(gfxfont_t*font)
@@ -106,7 +118,7 @@ static int findSpace(gfxfont_t*font)
                first_space = t;
        }
     }
-    if(GLYPH_IS_SPACE(&font->glyphs[32])) {
+    if(font->num_glyphs>32 && GLYPH_IS_SPACE(&font->glyphs[32])) {
        return 32;
     }
     return first_space;
@@ -143,8 +155,8 @@ static gfxfont_t* createGfxFont(FontInfo*src)
     double scale = 1;
     //printf("%d glyphs\n", font->num_glyphs);
     font->num_glyphs = 0;
-    font->ascent = fabs(src->descender);
-    font->descent = fabs(src->ascender);
+    font->ascent = fabs(src->ascender);
+    font->descent = fabs(src->descender);
     
     for(t=0;t<src->num_glyphs;t++) {
        if(src->glyphs[t]) {
@@ -213,9 +225,55 @@ static gfxfont_t* createGfxFont(FontInfo*src)
        }
 
     }
+
+    int kerning_size = 0;
+    for(t=0;t<src->num_glyphs;t++) {
+       dict_t* d = src->kerning[t];
+       if(!d) continue;
+       DICT_ITERATE_ITEMS(d,void*,key,mtf_t*,m) {
+           if(m) {
+               kerning_size++;
+           }
+       }
+    }
+    font->kerning_size = kerning_size;
+    font->kerning = (gfxkerning_t*)malloc(sizeof(gfxkerning_t)*kerning_size);
+    int pos = 0;
+    for(t=0;t<src->num_glyphs;t++) {
+       dict_t* d = src->kerning[t];
+       if(!d) continue;
+       DICT_ITERATE_ITEMS(d,void*,key,mtf_t*,m) {
+           if(m) {
+               font->kerning[pos].c1 = src->glyphs[t]->glyphid;
+               font->kerning[pos].c2 = src->glyphs[(int)(ptroff_t)key]->glyphid;
+               font->kerning[pos].advance = (int)(ptroff_t)m->first->key;
+               printf("kerning[%d] = (%d,%d,%d)\n", pos,
+                       font->kerning[pos].c1,
+                       font->kerning[pos].c2,
+                       font->kerning[pos].advance);
+               pos++;
+           }
+       }
+    }
+    //int advance = (int)(ptroff_t)m->first->key;
+
     return font;
 }
 
+static float find_average_glyph_advance(gfxfont_t*f)
+{
+    if(!f->num_glyphs)
+       return 0.0;
+
+    float*values = (float*)malloc(sizeof(float)*f->num_glyphs);
+    int t;
+    for(t=0;t<f->num_glyphs;t++) {
+       values[t] = f->glyphs[t].advance;
+    }
+    float m = medianf(values, f->num_glyphs);
+    free(values);
+    return m;
+}
 
 gfxfont_t* FontInfo::getGfxFont()
 {
@@ -223,6 +281,8 @@ gfxfont_t* FontInfo::getGfxFont()
         this->gfxfont = createGfxFont(this);
         this->gfxfont->id = strdup(this->id);
        this->space_char = findSpace(this->gfxfont);
+       this->average_advance = find_average_glyph_advance(this->gfxfont);
+
        if(this->space_char>=0) {
            msg("<debug> Font %s has space char %d (unicode=%d)", 
                    this->id, this->space_char, 
@@ -390,15 +450,31 @@ void InfoOutputDev::drawChar(GfxState *state, double x, double y,
        g->unicode = u[0];
     }
     if(currentfont->lastchar>=0 && currentfont->lasty == y) {
-       double xshift = x - currentfont->lastx;
+       double xshift = (x - currentfont->lastx);
        if(xshift>=0 && xshift > g->advance_max) {
            g->advance_max = xshift;
        }
+       int advance = (int)xshift;
+       if(advance>=0 && advance<g->advance*4 && advance!=currentfont->lastadvance) {
+           int c1 = currentfont->lastchar;
+           int c2 = code;
+           dict_t*d = currentfont->kerning[c1];
+           if(!d) {
+               d = currentfont->kerning[c1] = dict_new2(&int_type);
+           }
+           mtf_t*k = (mtf_t*)dict_lookup(d, (void*)(ptroff_t)c2);
+           if(!k) {
+               k = mtf_new(&int_type);
+               dict_put(d, (void*)(ptroff_t)c2, k);
+           }
+           mtf_increase(k, (void*)(ptroff_t)advance);
+       }
     }
 
     currentfont->lastx = x;
     currentfont->lasty = y;
     currentfont->lastchar = code;
+    currentfont->lastadvance = (int)(g->advance+0.5);
 }
 
 GBool InfoOutputDev::beginType3Char(GfxState *state, double x, double y, double dx, double dy, CharCode code, Unicode *u, int uLen)