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#include "fitz-internal.h"
void
fz_output_pwg_file_header(fz_output *out)
{
static const unsigned char pwgsig[4] = { 'R', 'a', 'S', '2' };
/* Sync word */
fz_write(out, pwgsig, 4);
}
void
fz_output_pwg_page(fz_output *out, const fz_pixmap *pixmap, const fz_pwg_options *pwg)
{
static const char zero[64] = { 0 };
unsigned char *sp;
int y, x, i, sn, dn, ss;
fz_context *ctx;
if (!out || !pixmap)
return;
ctx = out->ctx;
if (pixmap->n != 1 && pixmap->n != 2 && pixmap->n != 4)
fz_throw(ctx, "pixmap must be grayscale or rgb to write as pwg");
sn = pixmap->n;
dn = pixmap->n;
if (dn == 2 || dn == 4)
dn--;
/* Page Header: */
fz_write(out, pwg ? pwg->media_class : zero, 64);
fz_write(out, pwg ? pwg->media_color : zero, 64);
fz_write(out, pwg ? pwg->media_type : zero, 64);
fz_write(out, pwg ? pwg->output_type : zero, 64);
fz_write_int32be(out, pwg ? pwg->advance_distance : 0);
fz_write_int32be(out, pwg ? pwg->advance_media : 0);
fz_write_int32be(out, pwg ? pwg->collate : 0);
fz_write_int32be(out, pwg ? pwg->cut_media : 0);
fz_write_int32be(out, pwg ? pwg->duplex : 0);
fz_write_int32be(out, pixmap->xres);
fz_write_int32be(out, pixmap->yres);
/* CUPS format says that 284->300 are supposed to be the bbox of the
* page in points. PWG says 'Reserved'. */
for (i=284; i < 300; i += 4)
fz_write(out, zero, 4);
fz_write_int32be(out, pwg ? pwg->insert_sheet : 0);
fz_write_int32be(out, pwg ? pwg->jog : 0);
fz_write_int32be(out, pwg ? pwg->leading_edge : 0);
/* CUPS format says that 312->320 are supposed to be the margins of
* the lower left hand edge of page in points. PWG says 'Reserved'. */
for (i=312; i < 320; i += 4)
fz_write(out, zero, 4);
fz_write_int32be(out, pwg ? pwg->manual_feed : 0);
fz_write_int32be(out, pwg ? pwg->media_position : 0);
fz_write_int32be(out, pwg ? pwg->media_weight : 0);
fz_write_int32be(out, pwg ? pwg->mirror_print : 0);
fz_write_int32be(out, pwg ? pwg->negative_print : 0);
fz_write_int32be(out, pwg ? pwg->num_copies : 0);
fz_write_int32be(out, pwg ? pwg->orientation : 0);
fz_write_int32be(out, pwg ? pwg->output_face_up : 0);
fz_write_int32be(out, pixmap->w * 72/ pixmap->xres); /* Page size in points */
fz_write_int32be(out, pixmap->h * 72/ pixmap->yres);
fz_write_int32be(out, pwg ? pwg->separations : 0);
fz_write_int32be(out, pwg ? pwg->tray_switch : 0);
fz_write_int32be(out, pwg ? pwg->tumble : 0);
fz_write_int32be(out, pixmap->w); /* Page image in pixels */
fz_write_int32be(out, pixmap->h);
fz_write_int32be(out, pwg ? pwg->media_type_num : 0);
fz_write_int32be(out, 8); /* Bits per color */
fz_write_int32be(out, 8*dn); /* Bits per pixel */
fz_write_int32be(out, pixmap->w * dn); /* Bytes per line */
fz_write_int32be(out, 0); /* Chunky pixels */
fz_write_int32be(out, dn == 1 ? 18 /* Sgray */ : 19 /* Srgb */); /* Colorspace */
fz_write_int32be(out, pwg ? pwg->compression : 0);
fz_write_int32be(out, pwg ? pwg->row_count : 0);
fz_write_int32be(out, pwg ? pwg->row_feed : 0);
fz_write_int32be(out, pwg ? pwg->row_step : 0);
fz_write_int32be(out, dn); /* Num Colors */
for (i=424; i < 452; i += 4)
fz_write(out, zero, 4);
fz_write_int32be(out, 1); /* TotalPageCount */
fz_write_int32be(out, 1); /* CrossFeedTransform */
fz_write_int32be(out, 1); /* FeedTransform */
fz_write_int32be(out, 0); /* ImageBoxLeft */
fz_write_int32be(out, 0); /* ImageBoxTop */
fz_write_int32be(out, pixmap->w); /* ImageBoxRight */
fz_write_int32be(out, pixmap->h); /* ImageBoxBottom */
for (i=480; i < 1668; i += 4)
fz_write(out, zero, 4);
fz_write(out, pwg ? pwg->rendering_intent : zero, 64);
fz_write(out, pwg ? pwg->page_size_name : zero, 64);
/* Now output the actual bitmap, using a packbits like compression */
sp = pixmap->samples;
ss = pixmap->w * sn;
y = 0;
while (y < pixmap->h)
{
int yrep;
assert(sp == pixmap->samples + y * ss);
/* Count the number of times this line is repeated */
for (yrep = 1; yrep < 256 && y+yrep < pixmap->h; yrep++)
{
if (memcmp(sp, sp + yrep * ss, ss) != 0)
break;
}
fz_write_byte(out, yrep-1);
/* Encode the line */
x = 0;
while (x < pixmap->w)
{
int d;
assert(sp == pixmap->samples + y * ss + x * sn);
/* How far do we have to look to find a repeated value? */
for (d = 1; d < 128 && x+d < pixmap->w; d++)
{
if (memcmp(sp + (d-1)*sn, sp + d*sn, sn) == 0)
break;
}
if (d == 1)
{
int xrep;
/* We immediately have a repeat (or we've hit
* the end of the line). Count the number of
* times this value is repeated. */
for (xrep = 1; xrep < 128 && x+xrep < pixmap->w; xrep++)
{
if (memcmp(sp, sp + xrep*sn, sn) != 0)
break;
}
fz_write_byte(out, xrep-1);
fz_write(out, sp, dn);
sp += sn*xrep;
x += xrep;
}
else
{
fz_write_byte(out, 257-d);
x += d;
while (d > 0)
{
fz_write(out, sp, dn);
sp += sn;
d--;
}
}
}
/* Move to the next line */
sp += ss*(yrep-1);
y += yrep;
}
}
void
fz_output_pwg(fz_output *out, const fz_pixmap *pixmap, const fz_pwg_options *pwg)
{
fz_output_pwg_file_header(out);
fz_output_pwg_page(out, pixmap, pwg);
}
void
fz_write_pwg(fz_context *ctx, fz_pixmap *pixmap, char *filename, int append, const fz_pwg_options *pwg)
{
FILE *fp;
fz_output *out = NULL;
fp = fopen(filename, append ? "ab" : "wb");
if (!fp)
{
fz_throw(ctx, "cannot open file '%s': %s", filename, strerror(errno));
}
fz_var(out);
fz_try(ctx)
{
out = fz_new_output_with_file(ctx, fp);
if (!append)
fz_output_pwg_file_header(out);
fz_output_pwg_page(out, pixmap, pwg);
}
fz_always(ctx)
{
fz_close_output(out);
fclose(fp);
}
fz_catch(ctx)
{
fz_rethrow(ctx);
}
}
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