static void gif_setup(FILE *s)
{
int i;
int rtn;
BYTE cmap[3][256];
if (num_colors > 256)
fatal("number of colors must be <= 256 with GIF output");
dither_setup(num_colors);
dith = (u16or32 *) malloc((unsigned) sizeof(u16or32) * wdth);
assert(dith != NULL);
for (i=0; i<dither_ncolors; i++)
{
cmap[0][i] = dither_colormap[i*3+0];
cmap[1][i] = dither_colormap[i*3+1];
cmap[2][i] = dither_colormap[i*3+2];
}
rtn = gifout_open_file(s, wdth, hght, dither_ncolors, cmap, 0);
assert(rtn == GIFLIB_SUCCESS);
rtn = gifout_open_image(0, 0, wdth, hght);
assert(rtn == GIFLIB_SUCCESS);
}
static void bmp_setup()
{
int i;
struct BITMAPFILEHEADER bmf;
struct BITMAPINFOHEADER bmi;
dither_setup(num_colors);
dith = (u16or32 *) malloc((unsigned) sizeof(u16or32) * wdth);
assert(dith != NULL);
assert(sizeof(struct BITMAPFILEHEADER) == 14);
assert(sizeof(struct BITMAPINFOHEADER) == 40);
bmf.bfType[0] = 'B';
bmf.bfType[1] = 'M';
bmf.bfSize = sizeof(struct BITMAPFILEHEADER)
+ sizeof(struct BITMAPINFOHEADER)
+ num_colors * sizeof(struct RGBQUAD)
+ hght * 4 * ((wdth + 3) / 4);
bmf.bfReserved1 = 0;
bmf.bfReserved2 = 0;
bmf.bfOffBits = sizeof(struct BITMAPFILEHEADER)
+ sizeof(struct BITMAPINFOHEADER)
+ num_colors * sizeof(struct RGBQUAD);
fwrite(&bmf, 1, sizeof(bmf), stdout);
bmi.biSize = sizeof(bmi);
bmi.biWidth = wdth;
bmi.biHeight = -hght;
bmi.biPlanes = 1;
bmi.biBitCount = 8;
bmi.biCompression = BI_RGB;
bmi.biSizeImage = hght * 4 * ((wdth + 3) / 4);
bmi.biXPelsPerMeter = 0;
bmi.biYPelsPerMeter = 0;
bmi.biClrUsed = num_colors;
bmi.biClrImportant = num_colors;
fwrite(&bmi, 1, sizeof(bmi), stdout);
for (i=0; i<dither_ncolors; i++)
{
struct RGBQUAD rgb;
rgb.rgbBlue = dither_colormap[i*3+2];
rgb.rgbGreen = dither_colormap[i*3+1];
rgb.rgbRed = dither_colormap[i*3+0];
rgb.rgbReserved = 0;
fwrite(&rgb, 1, sizeof(rgb), stdout);
}
}
static void
png_setup ()
{
int i;
img = gdImageCreate (wdth, hght);
dither_setup (num_colors);
dith = (u16or32 *) malloc ((unsigned) sizeof (u16or32) * wdth);
assert (dith != NULL);
for (i = 0; i < dither_ncolors; i++) {
colors[i] = gdImageColorAllocate (img,
dither_colormap[i * 3 + 0],
dither_colormap[i * 3 + 1],
dither_colormap[i * 3 + 2]);
}
y = 0;
}
