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#include "mupdf/fitz.h"
/*
* Write pixmap to PNM file (without alpha channel)
*/
static void
pnm_write_header(fz_context *ctx, fz_band_writer *writer)
{
fz_output *out = writer->out;
int w = writer->w;
int h = writer->h;
int n = writer->n;
int alpha = writer->alpha;
n -= alpha;
if (n != 1 && n != 3)
fz_throw(ctx, FZ_ERROR_GENERIC, "pixmap must be grayscale or rgb to write as pnm");
if (n == 1)
fz_printf(ctx, out, "P5\n");
if (n == 3)
fz_printf(ctx, out, "P6\n");
fz_printf(ctx, out, "%d %d\n", w, h);
fz_printf(ctx, out, "255\n");
}
static void
pnm_write_band(fz_context *ctx, fz_band_writer *writer, int stride, int band_start, int band_height, const unsigned char *p)
{
fz_output *out = writer->out;
int w = writer->w;
int h = writer->h;
int n = writer->n;
int alpha = writer->alpha;
char buffer[2*3*4*5*6]; /* Buffer must be a multiple of 2 and 3 at least. */
int len;
int end = band_start + band_height;
if (n-alpha != 1 && n-alpha != 3)
fz_throw(ctx, FZ_ERROR_GENERIC, "pixmap must be grayscale or rgb to write as pnm");
if (end > h)
end = h;
end -= band_start;
/* Tests show that writing single bytes out at a time
* is appallingly slow. We get a huge improvement
* by collating stuff into buffers first. */
while (end--)
{
len = w;
while (len)
{
int num_written = len;
switch (n)
{
case 1:
/* No collation required */
fz_write(ctx, out, p, num_written);
p += num_written;
break;
case 2:
{
char *o = buffer;
int count;
if (num_written > sizeof(buffer))
num_written = sizeof(buffer);
for (count = num_written; count; count--)
{
*o++ = *p;
p += 2;
}
fz_write(ctx, out, buffer, num_written);
break;
}
case 3:
case 4:
{
char *o = buffer;
int count;
if (num_written > sizeof(buffer)/3)
num_written = sizeof(buffer)/3;
for (count = num_written; count; count--)
{
*o++ = p[0];
*o++ = p[1];
*o++ = p[2];
p += n;
}
fz_write(ctx, out, buffer, num_written * 3);
break;
}
}
len -= num_written;
}
p += stride - w*n;
}
}
fz_band_writer *fz_new_pnm_band_writer(fz_context *ctx, fz_output *out)
{
fz_band_writer *writer = fz_new_band_writer(ctx, fz_band_writer, out);
writer->header = pnm_write_header;
writer->band = pnm_write_band;
return writer;
}
void
fz_write_pixmap_as_pnm(fz_context *ctx, fz_output *out, fz_pixmap *pixmap)
{
fz_band_writer *writer = fz_new_pnm_band_writer(ctx, out);
fz_write_header(ctx, writer, pixmap->w, pixmap->h, pixmap->n, pixmap->alpha, 0, 0, 1);
fz_write_band(ctx, writer, pixmap->stride, 0, pixmap->h, pixmap->samples);
fz_write_trailer(ctx, writer);
fz_drop_band_writer(ctx, writer);
}
void
fz_save_pixmap_as_pnm(fz_context *ctx, fz_pixmap *pixmap, char *filename)
{
fz_band_writer *writer = NULL;
fz_output *out = fz_new_output_with_path(ctx, filename, 0);
fz_var(writer);
fz_try(ctx)
{
writer = fz_new_pnm_band_writer(ctx, out);
fz_write_header(ctx, writer, pixmap->w, pixmap->h, pixmap->n, pixmap->alpha, 0, 0, 1);
fz_write_band(ctx, writer, pixmap->stride, 0, pixmap->h, pixmap->samples);
fz_write_trailer(ctx, writer);
}
fz_always(ctx)
{
fz_drop_band_writer(ctx, writer);
fz_drop_output(ctx, out);
}
fz_catch(ctx)
fz_rethrow(ctx);
}
/*
* Write pixmap to PAM file (with or without alpha channel)
*/
static void
pam_write_header(fz_context *ctx, fz_band_writer *writer)
{
fz_output *out = writer->out;
int w = writer->w;
int h = writer->h;
int n = writer->n;
int alpha = writer->alpha;
fz_printf(ctx, out, "P7\n");
fz_printf(ctx, out, "WIDTH %d\n", w);
fz_printf(ctx, out, "HEIGHT %d\n", h);
fz_printf(ctx, out, "DEPTH %d\n", n);
fz_printf(ctx, out, "MAXVAL 255\n");
n -= alpha;
if (n == 0 && alpha) fz_printf(ctx, out, "TUPLTYPE GRAYSCALE\n");
else if (n == 1 && !alpha) fz_printf(ctx, out, "TUPLTYPE GRAYSCALE\n");
else if (n == 1 && alpha) fz_printf(ctx, out, "TUPLTYPE GRAYSCALE_ALPHA\n");
else if (n == 3 && !alpha) fz_printf(ctx, out, "TUPLTYPE RGB\n");
else if (n == 3 && alpha) fz_printf(ctx, out, "TUPLTYPE RGB_ALPHA\n");
else if (n == 4 && !alpha) fz_printf(ctx, out, "TUPLTYPE CMYK\n");
else if (n == 5) fz_printf(ctx, out, "TUPLTYPE CMYK_ALPHA\n");
fz_printf(ctx, out, "ENDHDR\n");
}
static void
pam_write_band(fz_context *ctx, fz_band_writer *writer, int stride, int band_start, int band_height, const unsigned char *sp)
{
fz_output *out = writer->out;
int w = writer->w;
int h = writer->h;
int n = writer->n;
int y;
int end = band_start + band_height;
if (end > h)
end = h;
end -= band_start;
for (y = 0; y < end; y++)
{
fz_write(ctx, out, sp, w * n);
sp += stride;
}
}
fz_band_writer *fz_new_pam_band_writer(fz_context *ctx, fz_output *out)
{
fz_band_writer *writer = fz_new_band_writer(ctx, fz_band_writer, out);
writer->header = pam_write_header;
writer->band = pam_write_band;
return writer;
}
void
fz_write_pixmap_as_pam(fz_context *ctx, fz_output *out, fz_pixmap *pixmap)
{
fz_band_writer *writer = fz_new_pam_band_writer(ctx, out);
fz_write_header(ctx, writer, pixmap->w, pixmap->h, pixmap->n, pixmap->alpha, 0, 0, 1);
fz_write_band(ctx, writer, pixmap->stride, 0, pixmap->h, pixmap->samples);
fz_write_trailer(ctx, writer);
fz_drop_band_writer(ctx, writer);
}
void
fz_save_pixmap_as_pam(fz_context *ctx, fz_pixmap *pixmap, char *filename)
{
fz_band_writer *writer = NULL;
fz_output *out = fz_new_output_with_path(ctx, filename, 0);
fz_var(writer);
fz_try(ctx)
{
writer = fz_new_pam_band_writer(ctx, out);
fz_write_header(ctx, writer, pixmap->w, pixmap->h, pixmap->n, pixmap->alpha, 0, 0, 1);
fz_write_band(ctx, writer, pixmap->stride, 0, pixmap->h, pixmap->samples);
fz_write_trailer(ctx, writer);
}
fz_always(ctx)
{
fz_drop_band_writer(ctx, writer);
fz_drop_output(ctx, out);
}
fz_catch(ctx)
fz_rethrow(ctx);
}
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