int main() {
do_rect();
do_square();
do_tri();
do_circle();
do_trap();
return 0;
}
static FT_Error
Render_GammaGrid( grBitmap* bitmap )
{
int g;
int xmargin = 10;
int gamma_first = 16;
int gamma_last = 26;
int gammas = gamma_last - gamma_first + 1;
int xside = (bitmap->width-100)/gammas - xmargin;
int yside = (bitmap->rows-100)/2;
int yrepeat = 1;
int x_0 = (bitmap->width - gammas*(xside+xmargin)+xmargin)/2;
int y_0 = (bitmap->rows - (8+yside*2*yrepeat))/2;
int pitch = bitmap->pitch;
if ( pitch < 0 )
pitch = -pitch;
#if 1
memset( bitmap->buffer, 255, pitch*bitmap->rows );
#else
/* fill the background with a simple pattern corresponding to 50%
* linear gray from a reasonable viewing distance
*/
{
int nx, ny;
unsigned char* line = bitmap->buffer;
if ( bitmap->pitch < 0 )
line -= (bitmap->pitch*(bitmap->rows-1));
for ( ny = 0; ny < bitmap->rows; ny++, line += bitmap->pitch )
{
unsigned char* dst = line;
int nx;
for ( nx = 0; nx < bitmap->width; nx++, dst += 3 )
{
int color = ((nx+ny) & 1)*255;
dst[0] = dst[1] = dst[2] = (unsigned char)color;
}
}
}
#endif
grGotobitmap( bitmap );
for ( g = gamma_first; g <= gamma_last; g += 1 )
{
double gamma_value = g/10.0;
char temp[6];
int x = x_0 + (xside+xmargin)*(g-gamma_first);
int y = y_0;
int ny;
grSetPixelMargin( x, y_0-8 );
grGotoxy( 0, 0 );
sprintf( temp, "%.1f", gamma_value );
grWrite( temp );
for ( ny = 0; ny < yrepeat; ny++, y += 2*yside )
{
do_rect( bitmap, x, y, xside, yside,
(int)( 255.0 * pow( 0.5, 1.0 / gamma_value ) ) );
do_rect( bitmap, x, y+yside, xside, yside, -1 );
}
}
return 0;
}