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/* remove_invisible_characters.c
Part of the swftools package.
Copyright (c) 2011 Matthias Kramm <kramm@quiss.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include <stdlib.h>
#include <stdint.h>
#include <memory.h>
#include "../gfxfilter.h"
#include "../gfxtools.h"
#include "../gfxfont.h"
#include "../gfxpoly.h"
#include "../gfximage.h"
#include "../types.h"
#include "../mem.h"
#include "../devices/render.h"
typedef struct _page {
uint8_t* visible;
int size8;
int size;
struct _page*next;
} page_t;
typedef struct _internal {
gfxdevice_t render;
int count;
double area;
page_t*first_page;
page_t*last_page;
page_t*current_page;
} internal_t;
static gfxcolor_t black = {255,0,0,0};
static void pass1_startpage(gfxfilter_t*f, int width, int height, gfxdevice_t*out)
{
internal_t*i = (internal_t*)f->internal;
gfxdevice_render_init(&i->render);
i->render.startpage(&i->render, width, height);
out->startpage(out, width, height);
i->count = 0;
}
static void pass1_endpage(gfxfilter_t*f, gfxdevice_t*out)
{
internal_t*i = (internal_t*)f->internal;
i->render.endpage(&i->render);
out->endpage(out);
gfxresult_t*result = i->render.finish(&i->render);
page_t*page = (page_t*)rfx_calloc(sizeof(page_t));
if(!i->first_page) {
i->first_page = i->last_page = i->current_page = page;
} else {
i->last_page->next = page;
i->last_page = page;
}
page->size = i->count + 1;
page->size8 = (page->size+7) >> 3;
page->visible = (uint8_t*)rfx_calloc(page->size8);
gfximage_t*img = (gfximage_t*)result->get(result, "page0");
int size = img->width*img->height;
int t;
for(t=0;t<size;t++) {
int index = ((*(uint32_t*)&img->data[t])>>8);
page->visible[index>>3] |= (1<<(index&7));
}
result->destroy(result);
}
static void pass1_fill(gfxfilter_t*f, gfxline_t*line, gfxcolor_t*color, gfxdevice_t*out)
{
internal_t*i = (internal_t*)f->internal;
if(color->a == 255) {
i->render.fill(&i->render, line, &black);
}
out->fill(out, line, color);
}
static void pass1_stroke(gfxfilter_t*f, gfxline_t*line, gfxcoord_t width, gfxcolor_t*color, gfx_capType cap_style, gfx_joinType joint_style, gfxcoord_t miterLimit, gfxdevice_t*out)
{
internal_t*i = (internal_t*)f->internal;
if(color->a == 255) {
i->render.stroke(&i->render, line, width, &black, cap_style, joint_style, miterLimit);
}
out->stroke(out, line, width, color, cap_style, joint_style, miterLimit);
}
static void pass1_fillbitmap(gfxfilter_t*f, gfxline_t*line, gfximage_t* bitmap, gfxmatrix_t*imgcoord2devcoord, gfxcxform_t*cxform, gfxdevice_t*out)
{
internal_t*i = (internal_t*)f->internal;
gfximage_t*img = gfximage_new(bitmap->width, bitmap->height);
int size = img->width*img->height;
memset(img->data, 0, size*sizeof(gfxcolor_t));
int t;
for(t=0;t<size;t++) {
img->data[t].a = bitmap->data[t].a == 255 ? 255 : 0;
}
i->render.fillbitmap(&i->render, line, img, imgcoord2devcoord, 0);
gfximage_free(img);
out->fillbitmap(out, line, bitmap, imgcoord2devcoord, cxform);
}
static void pass1_fillgradient(gfxfilter_t*f, gfxline_t*line, gfxgradient_t*gradient, gfxgradienttype_t type, gfxmatrix_t*gradcoord2devcoord, gfxdevice_t*out)
{
internal_t*i = (internal_t*)f->internal;
i->render.fill(&i->render, line, &black);
out->fillgradient(out, line, gradient, type, gradcoord2devcoord);
}
static void pass1_startclip(gfxfilter_t*f, gfxline_t*line, gfxdevice_t*out)
{
internal_t*i = (internal_t*)f->internal;
i->render.startclip(&i->render, line);
out->startclip(out, line);
}
static void pass1_endclip(gfxfilter_t*f, gfxdevice_t*out)
{
internal_t*i = (internal_t*)f->internal;
i->render.endclip(&i->render);
out->endclip(out);
}
static void pass1_addfont(gfxfilter_t*f, gfxfont_t*font, gfxdevice_t*out)
{
internal_t*i = (internal_t*)f->internal;
/* Don't pass this to device->render(). We're not in a page
yet, and the render device doesn't need addfont() */
//i->render.addfont(&i->render, font);
out->addfont(out, font);
}
static void pass1_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;
i->count++;
gfxcolor_t c;
*(uint32_t*)&c = i->count<<8|0xff;
double advance = font->glyphs[glyphnr].advance;
gfxline_t*box = gfxline_makerectangle(0,0,advance,font->ascent);
gfxline_transform(box, matrix);
i->render.fill(&i->render, box, &c);
if(font->ascent < 512) {
i->render.drawchar(&i->render, font, glyphnr, &c, matrix);
}
gfxline_free(box);
out->drawchar(out, font, glyphnr, color, matrix);
}
static gfxresult_t*pass1_finish(gfxfilter_t*f, gfxdevice_t*out)
{
internal_t*i = (internal_t*)f->internal;
return out->finish(out);
}
static void pass2_startpage(gfxfilter_t*f, int width, int height, gfxdevice_t*out)
{
internal_t*i = (internal_t*)f->internal;
out->startpage(out, width, height);
i->count = 0;
}
static void pass2_endpage(gfxfilter_t*f, gfxdevice_t*out)
{
internal_t*i = (internal_t*)f->internal;
i->current_page = i->current_page->next;
out->endpage(out);
}
static void pass2_addfont(gfxfilter_t*f, gfxfont_t*font, gfxdevice_t*out)
{
internal_t*i = (internal_t*)f->internal;
out->addfont(out, font);
}
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;
i->count++;
if(i->current_page->visible[i->count>>3]&(1<<(i->count&7))) {
out->drawchar(out, font, glyphnr, color, matrix);
} else {
#ifdef DEBUG_AREA
gfxline_t*line = gfxline_clone(font->glyphs[glyphnr].line);
gfxline_transform(line, matrix);
gfxpoly_t*poly = gfxpoly_from_fill(line, 0.05);
double area = gfxpoly_area(poly);
gfxpoly_destroy(poly);
gfxline_free(line);
i->area += area;
#endif
}
}
static gfxresult_t*pass2_finish(gfxfilter_t*f, gfxdevice_t*out)
{
internal_t*i = (internal_t*)f->internal;
#ifdef DEBUG_AREA
printf("%f\n", i->area);
#endif
return out->finish(out);
}
void gfxtwopassfilter_remove_invisible_characters_init(gfxtwopassfilter_t*f)
{
internal_t*i = (internal_t*)rfx_calloc(sizeof(internal_t));
memset(f, 0, sizeof(gfxtwopassfilter_t));
f->type = gfxfilter_twopass;
f->pass1.name = "filter \"remove invisible characters\" pass 1";
f->pass1.addfont = pass1_addfont;
f->pass1.drawchar = pass1_drawchar;
f->pass1.fill = pass1_fill;
f->pass1.fillbitmap = pass1_fillbitmap;
f->pass1.fillgradient = pass1_fillgradient;
f->pass1.stroke = pass1_stroke;
f->pass1.startclip= pass1_startclip;
f->pass1.endclip = pass1_endclip;
f->pass1.startpage = pass1_startpage;
f->pass1.endpage = pass1_endpage;
f->pass1.finish = pass1_finish;
f->pass1.internal = i;
f->pass2.name = "filter \"remove invisible characters\" pass 2";
f->pass2.addfont = pass2_addfont;
f->pass2.drawchar = pass2_drawchar;
f->pass2.startpage = pass2_startpage;
f->pass2.endpage = pass2_endpage;
f->pass2.finish = pass2_finish;
f->pass2.internal = i;
}
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