X-Git-Url: http://git.asbjorn.biz/?p=swftools.git;a=blobdiff_plain;f=lib%2Ffilters%2Fremove_font_transforms.c;h=c04d110683023301dd289cf572262360d5b5a0f1;hp=bdaae3834e885cd4d192343d66f11de821d4982c;hb=0e93bb43429d78593cd45ae509e5114f6ab31a52;hpb=c788b3270c1380af50d9ff83341b81565b74b28f

diff --git a/lib/filters/remove_font_transforms.c b/lib/filters/remove_font_transforms.c
index bdaae38..c04d110 100644
--- a/lib/filters/remove_font_transforms.c
+++ b/lib/filters/remove_font_transforms.c
@@ -27,11 +27,12 @@
 #include "../types.h"
 #include "../mem.h"
 #include "../q.h"
+#include "../log.h"
 
 typedef struct _mymatrix {
     float m00,m01,m10,m11;
     char*id;
-    double size; // not hashed
+    unsigned char alpha;
 } mymatrix_t;
 
 static void* mymatrix_clone(const void*_m) {
@@ -52,6 +53,8 @@ static unsigned int mymatrix_hash(const void*_m) {
     h = crc32_add_bytes(h, (char*)&m->m01, sizeof(m->m01));
     h = crc32_add_bytes(h, (char*)&m->m10, sizeof(m->m10));
     h = crc32_add_bytes(h, (char*)&m->m11, sizeof(m->m11));
+    h = crc32_add_bytes(h, (char*)&m->alpha, 1);
+    h = crc32_add_string(h, m->id);
     return h;
 }
 static void mymatrix_destroy(void*_m) {
@@ -74,7 +77,9 @@ static char mymatrix_equals(const void*_m1, const void*_m2) {
     return *(U32*)&m1->m00 == *(U32*)&m2->m00 &&
            *(U32*)&m1->m01 == *(U32*)&m2->m01 &&
            *(U32*)&m1->m10 == *(U32*)&m2->m10 &&
-           *(U32*)&m1->m11 == *(U32*)&m2->m11;
+           *(U32*)&m1->m11 == *(U32*)&m2->m11 &&
+           m1->alpha == m2->alpha &&
+	   !strcmp(m1->id, m2->id);
 }
 type_t mymatrix_type = {
     dup: mymatrix_clone,
@@ -90,25 +95,35 @@ typedef struct _internal {
 
 
 #ifdef __GNUC__
-void __attribute__((noinline)) 
-     matrix_convert(gfxmatrix_t*in, const char*id, mymatrix_t*out)
+int __attribute__((noinline)) 
+     matrix_convert(gfxmatrix_t*in, const char*id, mymatrix_t*out, gfxmatrix_t*scalematrix, unsigned char alpha)
 #else
-void matrix_convert(gfxmatrix_t*in, const char*id, mymatrix_t*out)
+int matrix_convert(gfxmatrix_t*in, const char*id, mymatrix_t*out, gfxmatrix_t*scalematrix, unsigned char alpha)
 #endif
 {
     double l1 = sqrt(in->m00 * in->m00 + in->m01 * in->m01);
     double l2 = sqrt(in->m10 * in->m10 + in->m11 * in->m11);
-    double l = l1+l2;
-    if(l < 1e-20) {
+    double l = (l1+l2)/2.0;
+    if(l < 1e-10) {
 	memset(out, 0, sizeof(*out));
-	return;
+	return 0;
     }
     out->m00 = in->m00 / l;
-    out->m01 = in->m01 / l;
     out->m10 = in->m10 / l;
-    out->m11 = in->m11 / l;
+    out->m01 = -in->m01 / l;
+    out->m11 = -in->m11 / l;
     out->id = (char*)id;
-    out->size = l;
+    out->alpha = alpha?1:0;
+
+    if(scalematrix) {
+	scalematrix->m00 = l;
+	scalematrix->m01 = 0;
+	scalematrix->m10 = 0;
+	scalematrix->m11 = -l;
+	scalematrix->tx = in->tx;
+	scalematrix->ty = in->ty;
+    }
+    return 1;
 }
 
 typedef struct _matrixdata {
@@ -120,6 +135,7 @@ typedef struct _transformedfont {
     gfxfont_t*font;
     mymatrix_t matrix;
     int*used;
+    double dx;
 } transformedfont_t;
 
 static transformedfont_t* transformedfont_new(gfxfont_t*orig, mymatrix_t*m)
@@ -127,7 +143,15 @@ static transformedfont_t* transformedfont_new(gfxfont_t*orig, mymatrix_t*m)
     transformedfont_t*f = rfx_calloc(sizeof(transformedfont_t));
     f->orig = orig;
     f->matrix = *m;
-    f->used = malloc(sizeof(f->used[0])*orig->num_glyphs);
+    f->used = rfx_calloc(sizeof(f->used[0])*orig->num_glyphs);
+    int t;
+    for(t=0;t<orig->num_glyphs;t++) {
+	if(orig->glyphs[t].unicode==32 && 
+	   (!orig->glyphs[t].line || 
+	    !orig->glyphs[t].line->next || 
+	    !orig->glyphs[t].line->next->next))
+	    f->used[t]=1; //always preserve the space char in fonts
+    }
     return f;
 }
 
@@ -135,7 +159,10 @@ static void pass1_drawchar(gfxfilter_t*f, gfxfont_t*font, int glyphnr, gfxcolor_
 {
     internal_t*i = (internal_t*)f->internal;
     mymatrix_t m;
-    matrix_convert(matrix, font->id, &m);
+    if(!font->id) 
+	msg("<error> Font has no ID");
+    if(!matrix_convert(matrix, font->id?font->id:"unknown", &m, 0, color->a))
+	return;
     transformedfont_t*fd = dict_lookup(i->matrices, &m);
     if(!fd) {
 	fd = transformedfont_new(font, &m);
@@ -145,6 +172,21 @@ static void pass1_drawchar(gfxfilter_t*f, gfxfont_t*font, int glyphnr, gfxcolor_
     out->drawchar(out, font, glyphnr, color, matrix);
 }
 
+static void glyph_transform(gfxglyph_t*g, mymatrix_t*mm)
+{
+    gfxmatrix_t m;
+    m.m00 = mm->m00;
+    m.m01 = mm->m01;
+    m.m10 = mm->m10;
+    m.m11 = mm->m11;
+    m.tx = 0;
+    m.ty = 0;
+    if(m.m00>0)
+	g->advance *= m.m00;
+    g->line = gfxline_clone(g->line);
+    gfxline_transform(g->line, &m);
+}
+
 static gfxresult_t* pass1_finish(gfxfilter_t*f, gfxdevice_t*out)
 {
     internal_t*i = (internal_t*)f->internal;
@@ -157,7 +199,8 @@ static gfxresult_t* pass1_finish(gfxfilter_t*f, gfxdevice_t*out)
 	int t;
 	int count=0;
 	for(t=0;t<fd->orig->num_glyphs;t++) {
-	    if(fd->used[t]) count++;
+	    if(fd->used[t]) 
+		count++;
 	}
 	font->num_glyphs = count;
 	font->glyphs = rfx_calloc(sizeof(gfxglyph_t)*font->num_glyphs);
@@ -165,18 +208,88 @@ static gfxresult_t* pass1_finish(gfxfilter_t*f, gfxdevice_t*out)
 	for(t=0;t<fd->orig->num_glyphs;t++) {
 	    if(fd->used[t]) {
 		font->glyphs[count] = fd->orig->glyphs[t];
-		fd->used[t] = count;
+		glyph_transform(&font->glyphs[count], &fd->matrix);
+		fd->used[t] = count + 1;
 		count++;
 	    }
 	}
+
+	/* adjust the origin so that every character is to the
+	   right of the origin */
+	gfxbbox_t total = {0,0,0,0};
+	double average_xmax = 0;
+	for(t=0;t<count;t++) {
+	    gfxline_t*line = font->glyphs[t].line;
+	    gfxbbox_t b = gfxline_getbbox(line);
+	    total = gfxbbox_expand_to_bbox(total, b);
+	}
+	if(count) 
+	    average_xmax /= count;
+
+	fd->dx = 0;//-total.xmin;
+
+	font->ascent = total.ymax;
+	font->descent = -total.ymin;
+
+	for(t=0;t<count;t++) {
+	    gfxglyph_t*g = &font->glyphs[t];
+	    gfxline_t*line = font->glyphs[t].line;
+
+	    if(fd->matrix.alpha) {
+		while(line) {
+		    line->x += fd->dx;
+		    line->sx += fd->dx;
+		    line = line->next;
+		}
+	    } else {
+		gfxline_free(g->line);
+		/* for OCR: remove the outlines of characters that are only
+		   ever displayed with alpha=0 */
+		g->line = (gfxline_t*)rfx_calloc(sizeof(gfxline_t));
+		g->line->type = gfx_moveTo;
+		g->line->x = g->advance;
+	    }
+	}
+
+	if(fd->matrix.m00>0) {
+	    /* subset kerning table */
+	    count = 0;
+	    for(t=0;t<fd->orig->kerning_size;t++) {
+		int char1 = fd->used[fd->orig->kerning[t].c1]-1;
+		int char2 = fd->used[fd->orig->kerning[t].c2]-1;
+		if(char1>=0 && char2>=0) {
+		    count++;
+		}
+	    }
+	    font->kerning = malloc(sizeof(font->kerning[0])*count);
+	    font->kerning_size = count;
+	    count = 0;
+	    for(t=0;t<fd->orig->kerning_size;t++) {
+		int char1 = fd->used[fd->orig->kerning[t].c1]-1;
+		int char2 = fd->used[fd->orig->kerning[t].c2]-1;
+		if(char1>=0 && char2>=0) {
+		    font->kerning[count].c1 = char1;
+		    font->kerning[count].c2 = char2;
+		    font->kerning[count].advance = fd->orig->kerning[t].advance * fd->matrix.m00;
+		    count++;
+		}
+	    }
+	}
 	gfxfont_fix_unicode(font);
     }
     return out->finish(out);
 }
 
-static void pass2_drawchar(gfxfilter_t*f, gfxfont_t*font, int glyphnr, gfxcolor_t*color, gfxmatrix_t*matrix, gfxdevice_t*out)
+static void pass2_addfont(gfxfilter_t*f, gfxfont_t*font, gfxdevice_t*out)
+{
+    /* we throw away original fonts, and do the addfont() for the transformed
+       fonts in the first drawchar() */
+}
+
+static void pass2_drawchar(gfxfilter_t*f, gfxfont_t*font, int glyphnr, gfxcolor_t*_color, gfxmatrix_t*matrix, gfxdevice_t*out)
 {
     internal_t*i = (internal_t*)f->internal;
+    gfxcolor_t color = *_color;
 
     if(i->first) {
 	i->first = 0;
@@ -186,9 +299,31 @@ static void pass2_drawchar(gfxfilter_t*f, gfxfont_t*font, int glyphnr, gfxcolor_
     }
 
     mymatrix_t m;
-    matrix_convert(matrix, font->id, &m);
+    gfxmatrix_t scalematrix;
+    matrix_convert(matrix, font->id?font->id:"unknown", &m, &scalematrix, color.a);
     transformedfont_t*d = dict_lookup(i->matrices, &m);
-    out->drawchar(out, d->font, d->used[glyphnr], color, matrix);
+    scalematrix.tx -= d->dx*scalematrix.m00;
+
+    /* if this character is invisible (alpha=0), then we will have removed the
+       outline, so we make set the alpha color channel to "fully visible" again to allow
+       output devices to be more performant (transparency is expensive) */
+    if(!m.alpha) 
+	color.a = 255;
+
+    out->drawchar(out, d->font, d->used[glyphnr]-1, &color, &scalematrix);
+}
+
+static gfxresult_t* pass2_finish(gfxfilter_t*f, gfxdevice_t*out)
+{
+    internal_t*i = (internal_t*)f->internal;
+    DICT_ITERATE_DATA(i->matrices, transformedfont_t*, fd) {
+	if(fd->used) {
+	    free(fd->used);fd->used=0;
+	}
+	free(fd);
+    }
+    dict_destroy(i->matrices);i->matrices=0;
+    return out->finish(out);
 }
 
 void gfxtwopassfilter_remove_font_transforms_init(gfxtwopassfilter_t*f)
@@ -204,7 +339,9 @@ void gfxtwopassfilter_remove_font_transforms_init(gfxtwopassfilter_t*f)
     f->pass1.internal = i;
 
     f->pass2.name = "remove font transforms pass 2";
+    f->pass2.addfont = pass2_addfont;
     f->pass2.drawchar = pass2_drawchar;
+    f->pass2.finish = pass2_finish;
     f->pass2.internal = i;
 
     i->matrices = dict_new2(&mymatrix_type);