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#include "mupdf/fitz.h"
#include <string.h>
/*
* Write pixmap to TGA file (with or without alpha channel)
*/
typedef struct {
fz_band_writer super;
int is_bgr;
} tga_band_writer;
static inline void tga_put_pixel(fz_context *ctx, fz_output *out, const unsigned char *data, int n, int is_bgr)
{
int a, inva;
switch(n)
{
case 4: /* RGBA or BGRA */
a = data[3];
inva = a ? 256 * 255 / a : 0;
if (!is_bgr) {
fz_write_byte(ctx, out, (data[2] * inva + 128)>>8);
fz_write_byte(ctx, out, (data[1] * inva + 128)>>8);
fz_write_byte(ctx, out, (data[0] * inva + 128)>>8);
} else {
fz_write_byte(ctx, out, (data[0] * inva + 128)>>8);
fz_write_byte(ctx, out, (data[1] * inva + 128)>>8);
fz_write_byte(ctx, out, (data[2] * inva + 128)>>8);
}
fz_write_byte(ctx, out, a);
break;
case 3: /* RGB or BGR */
if (!is_bgr) {
fz_write_byte(ctx, out, data[2]);
fz_write_byte(ctx, out, data[1]);
fz_write_byte(ctx, out, data[0]);
} else {
fz_write_byte(ctx, out, data[0]);
fz_write_byte(ctx, out, data[1]);
fz_write_byte(ctx, out, data[2]);
}
break;
case 2: /* GA */
a = data[1];
inva = a ? 256 * 255 / a : 0;
inva = (data[0] * inva + 128)>>8;
fz_write_byte(ctx, out, inva);
fz_write_byte(ctx, out, inva);
fz_write_byte(ctx, out, inva);
fz_write_byte(ctx, out, a);
break;
case 1: /* G */
fz_write_byte(ctx, out, data[0]);
break;
}
}
void
fz_save_pixmap_as_tga(fz_context *ctx, fz_pixmap *pixmap, const char *filename)
{
fz_output *out = fz_new_output_with_path(ctx, filename, 0);
fz_try(ctx)
{
fz_write_pixmap_as_tga(ctx, out, pixmap);
fz_close_output(ctx, out);
}
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)
{
fz_band_writer *writer = fz_new_tga_band_writer(ctx, out, fz_colorspace_is_bgr(ctx, pixmap->colorspace));
fz_try(ctx)
{
fz_write_header(ctx, writer, pixmap->w, pixmap->h, pixmap->n, pixmap->alpha, pixmap->xres, pixmap->yres, 0, pixmap->colorspace, pixmap->seps);
fz_write_band(ctx, writer, -pixmap->stride, pixmap->h, pixmap->samples + pixmap->stride * (pixmap->h-1));
}
fz_always(ctx)
fz_drop_band_writer(ctx, writer);
fz_catch(ctx)
fz_rethrow(ctx);
}
static void
tga_write_header(fz_context *ctx, fz_band_writer *writer_, const fz_colorspace *cs)
{
tga_band_writer *writer = (tga_band_writer *)writer_;
fz_output *out = writer->super.out;
int w = writer->super.w;
int h = writer->super.h;
int n = writer->super.n;
int alpha = writer->super.alpha;
unsigned char head[18];
int d = (alpha && n > 1) ? 4 : (n == 1 ? 1 : 3);
if (writer->super.s != 0)
fz_throw(ctx, FZ_ERROR_GENERIC, "TGA writer cannot cope with spot colors");
if (n-alpha > 1 && n != 3+alpha)
fz_throw(ctx, FZ_ERROR_GENERIC, "pixmap must be grayscale/rgb/rgba (with or without alpha) to write as tga");
memset(head, 0, sizeof(head));
head[2] = n > 1 ? 10 /* RGB or RGBA or GA */ : 11 /* G */;
head[12] = w & 0xFF; head[13] = (w >> 8) & 0xFF;
head[14] = h & 0xFF; head[15] = (h >> 8) & 0xFF;
head[16] = d * 8; /* BPP */
head[17] = alpha && n > 1 ? 8 : 0; /* Alpha bpp */
fz_write_data(ctx, out, head, sizeof(head));
}
static void
tga_write_band(fz_context *ctx, fz_band_writer *writer_, int stride, int band_start, int band_height, const unsigned char *samples)
{
tga_band_writer *writer = (tga_band_writer *)writer_;
fz_output *out = writer->super.out;
int w = writer->super.w;
int n = writer->super.n;
int d = (writer->super.alpha && n > 1) ? 4 : (n == 1 ? 1 : 3);
int is_bgr = writer->is_bgr;
int k;
for (k = 0; k < band_height; k++)
{
int i, j;
const unsigned char *line = samples + stride * k;
for (i = 0, j = 1; i < w; i += j, j = 1)
{
for (; i + j < w && j < 128 && !memcmp(line + i * n, line + (i + j) * n, d); j++);
if (j > 1)
{
fz_write_byte(ctx, out, j - 1 + 128);
tga_put_pixel(ctx, out, line + i * n, n, is_bgr);
}
else
{
for (; i + j < w && j <= 128 && memcmp(line + (i + j - 1) * n, line + (i + j) * n, d) != 0; j++);
if (i + j < w || j > 128)
j--;
fz_write_byte(ctx, out, j - 1);
for (; j > 0; j--, i++)
tga_put_pixel(ctx, out, line + i * n, n, is_bgr);
}
}
}
}
static void
tga_write_trailer(fz_context *ctx, fz_band_writer *writer)
{
fz_output *out = writer->out;
fz_write_data(ctx, out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.\0", 26);
}
fz_band_writer *fz_new_tga_band_writer(fz_context *ctx, fz_output *out, int is_bgr)
{
tga_band_writer *writer = fz_new_band_writer(ctx, tga_band_writer, out);
writer->super.header = tga_write_header;
writer->super.band = tga_write_band;
writer->super.trailer = tga_write_trailer;
writer->is_bgr = is_bgr;
return &writer->super;
}
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