void load_tga(tga_image *tga, const char *fn)
{
DONTFAIL( tga_read(tga, fn) );
printf("Loaded %dx%dx%dbpp targa (\"%s\").\n",
tga->width, tga->height, tga->pixel_depth, fn);
if (!tga_is_mono(tga)) DONTFAIL( tga_desaturate_rec_601_1(tga) );
if (!tga_is_top_to_bottom(tga)) DONTFAIL( tga_flip_vert(tga) );
if (tga_is_right_to_left(tga)) DONTFAIL( tga_flip_horiz(tga) );
if ((tga->width % 8 != 0) || (tga->height % 8 != 0))
{
printf("Width and height must be multiples of 8\n");
exit(EXIT_FAILURE);
}
}
static RGBSpectrum *ReadImageTGA(const std::string &name, int *width,
int *height) {
tga_image img;
tga_result result;
if ((result = tga_read(&img, name.c_str())) != TGA_NOERR) {
Error("Unable to read from TGA file \"%s\" (%s)", name.c_str(),
tga_error(result));
return nullptr;
}
if (tga_is_right_to_left(&img)) tga_flip_horiz(&img);
if (!tga_is_top_to_bottom(&img)) tga_flip_vert(&img);
if (tga_is_colormapped(&img)) tga_color_unmap(&img);
*width = img.width;
*height = img.height;
// "Unpack" the pixels (origin in the lower left corner).
// TGA pixels are in BGRA format.
RGBSpectrum *ret = new RGBSpectrum[*width * *height];
RGBSpectrum *dst = ret;
for (int y = *height - 1; y >= 0; y--)
for (int x = 0; x < *width; x++) {
uint8_t *src = tga_find_pixel(&img, x, y);
if (tga_is_mono(&img))
*dst++ = RGBSpectrum(*src / 255.f);
else {
Float c[3];
c[2] = src[0] / 255.f;
c[1] = src[1] / 255.f;
c[0] = src[2] / 255.f;
*dst++ = RGBSpectrum::FromRGB(c);
}
}
tga_free_buffers(&img);
Info("Read TGA image %s (%d x %d)", name.c_str(), *width, *height);
return ret;
}
/* ---------------------------------------------------------------------------
* Desaturate the specified Targa using the specified coefficients:
* output = ( red * cr + green * cg + blue * cb ) / dv
*/
tga_result tga_desaturate(tga_image *img, const int cr, const int cg,
const int cb, const int dv)
{
uint8_t bpp = img->pixel_depth / 8; /* bytes per pixel */
uint8_t *dest, *src, *tmp;
if (tga_is_mono(img)) return TGAERR_MONO;
if (tga_is_colormapped(img))
{
tga_result result = tga_color_unmap(img);
if (result != TGA_NOERR) return result;
}
if (!UNMAP_DEPTH(img->pixel_depth)) return TGAERR_PIXEL_DEPTH;
dest = img->image_data;
for (src = img->image_data;
src < img->image_data + img->width*img->height*bpp;
src += bpp)
{
uint8_t b, g, r;
(void)tga_unpack_pixel(src, img->pixel_depth, &b, &g, &r, NULL);
*dest = (uint8_t)( ( (int)b * cb +
(int)g * cg +
(int)r * cr ) / dv );
dest++;
}
/* shrink */
tmp = (uint8_t*)realloc(img->image_data, img->width * img->height);
if (tmp == NULL) return TGAERR_NO_MEM;
img->image_data = (uint8_t*)tmp;
img->pixel_depth = 8;
img->image_type = TGA_IMAGE_TYPE_MONO;
return TGA_NOERR;
}