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#include "mupdf/fitz.h"
/*
* Write pixmap to TGA file (with or without alpha channel)
*/
static inline void tga_put_pixel(fz_context *ctx, fz_output *out, unsigned char *data, int n, int is_bgr)
{
if (n >= 3 && !is_bgr)
{
fz_putc(ctx, out, data[2]);
fz_putc(ctx, out, data[1]);
fz_putc(ctx, out, data[0]);
if (n == 4)
fz_putc(ctx, out, data[3]);
return;
}
if (n == 2)
{
fz_putc(ctx, out, data[0]);
fz_putc(ctx, out, data[0]);
}
fz_write(ctx, out, data, n);
}
void
fz_save_pixmap_as_tga(fz_context *ctx, fz_pixmap *pixmap, const char *filename, int savealpha)
{
fz_output *out = fz_new_output_with_path(ctx, filename, 0);
fz_try(ctx)
fz_write_pixmap_as_tga(ctx, out, pixmap, savealpha);
fz_always(ctx)
fz_drop_output(ctx, out);
fz_catch(ctx)
fz_rethrow(ctx);
}
void
fz_write_pixmap_as_tga(fz_context *ctx, fz_output *out, fz_pixmap *pixmap, int savealpha)
{
unsigned char head[18];
int n = pixmap->n;
int d = savealpha || n == 1 ? n : n - 1;
int is_bgr = pixmap->colorspace == fz_device_bgr(ctx);
int k;
if (pixmap->colorspace && pixmap->colorspace != fz_device_gray(ctx) &&
pixmap->colorspace != fz_device_rgb(ctx) && pixmap->colorspace != fz_device_bgr(ctx))
{
fz_throw(ctx, FZ_ERROR_GENERIC, "pixmap must be grayscale or rgb to write as tga");
}
memset(head, 0, sizeof(head));
head[2] = n == 4 ? 10 : 11;
head[12] = pixmap->w & 0xFF; head[13] = (pixmap->w >> 8) & 0xFF;
head[14] = pixmap->h & 0xFF; head[15] = (pixmap->h >> 8) & 0xFF;
head[16] = d * 8;
head[17] = savealpha && n > 1 ? 8 : 0;
if (savealpha && d == 2)
head[16] = 32;
fz_write(ctx, out, head, sizeof(head));
for (k = 1; k <= pixmap->h; k++)
{
int i, j;
unsigned char *line = pixmap->samples + pixmap->w * n * (pixmap->h - k);
for (i = 0, j = 1; i < pixmap->w; i += j, j = 1)
{
for (; i + j < pixmap->w && j < 128 && !memcmp(line + i * n, line + (i + j) * n, d); j++);
if (j > 1)
{
fz_putc(ctx, out, j - 1 + 128);
tga_put_pixel(ctx, out, line + i * n, d, is_bgr);
}
else
{
for (; i + j < pixmap->w && j <= 128 && memcmp(line + (i + j - 1) * n, line + (i + j) * n, d) != 0; j++);
if (i + j < pixmap->w || j > 128)
j--;
fz_putc(ctx, out, j - 1);
for (; j > 0; j--, i++)
tga_put_pixel(ctx, out, line + i * n, d, is_bgr);
}
}
}
fz_write(ctx, out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.\0", 26);
}
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