void I_checker(Image *img, Color c1, Color c2, int step)
{
int x,y;
for(x=0;x<img->_width;x++)
for(y=0;y<img->_height;y++)
{
int n_x = x/step;
int n_y = y/step;
if((n_x+n_y)%2==0) _plot(img,x,y,c1);
else _plot(img,x,y,c2);
}
}
void draw_line_antialias_(GBitmap* img, int16_t x1, int16_t y1, int16_t x2, int16_t y2, GColor8 color)
{
uint8_t* img_pixels = gbitmap_get_data(img);
int16_t w = gbitmap_get_bounds(img).size.w;
int16_t h = gbitmap_get_bounds(img).size.h;
fixed dx = int_to_fixed(abs_(x1 - x2));
fixed dy = int_to_fixed(abs_(y1 - y2));
bool steep = dy > dx;
if(steep){
swap_(x1, y1);
swap_(x2, y2);
}
if(x1 > x2){
swap_(x1, x2);
swap_(y1, y2);
}
dx = x2 - x1;
dy = y2 - y1;
fixed intery;
int x;
for(x=x1; x <= x2; x++) {
intery = int_to_fixed(y1) + (int_to_fixed(x - x1) * dy / dx);
if(x>=0){
if(steep){
_plot(img_pixels, w, h, ipart_(intery) , x, color, rfpart_(intery));
_plot(img_pixels, w, h, ipart_(intery) + 1, x, color, fpart_(intery));
}
else {
_plot(img_pixels, w, h, x, ipart_(intery) , color, rfpart_(intery));
_plot(img_pixels, w, h, x, ipart_(intery) + 1, color, fpart_(intery));
}
}
}
}
Image* I_read(char *imagefilename)
{
Image *img;
char command[100];
if(_isPpm(imagefilename)) sprintf(command,"cp %s input.ppm",imagefilename);
else sprintf(command,"convert %s input.ppm",imagefilename);
int stat = system(command);
if(stat!=0)
{
fprintf(stderr,"Convert : %s -> input.ppm impossible conversion.\n", imagefilename);
exit(1);
}
else
{
Ppm ppm = PPM_nouv("input.ppm", PPM_LECTURE);
system("rm input.ppm");
fprintf(stderr,"%d x %d\n",PPM_largeur(ppm),PPM_hauteur(ppm));
if(ppm!=NULL)
{
img = I_new(PPM_largeur(ppm),PPM_hauteur(ppm));
int nb_bits=ppm->_nb_bits;
int valmax = ppm->_valmax;
int nb_pixels = img->_width*img->_height;
if(nb_bits <= 8)
{
unsigned char *donnees = (unsigned char*)calloc(3*nb_pixels,sizeof(unsigned char));
PPM_lectureDonneesChar(ppm, donnees);
int x,y;
for(y=0;y<img->_height;y++)
for(x=0;x<img->_width;x++)
{
int indice = (img->_height-y)*img->_width + x;
Color c = C_new((1.0*donnees[3*indice ])/valmax,
(1.0*donnees[3*indice+1])/valmax,
(1.0*donnees[3*indice+2])/valmax);
_plot(img,x,y,c);
}
}
else
{
unsigned short *donnees = (unsigned short*)calloc(3*nb_pixels,sizeof(unsigned short));
PPM_lectureDonneesShort(ppm, donnees);
int x,y;
for(y=0;y<img->_height;y++)
for(x=0;x<img->_width;x++)
{
int indice = (img->_height-y)*img->_width + x;
Color c = C_new((1.0*donnees[3*indice ])/valmax,
(1.0*donnees[3*indice+1])/valmax,
(1.0*donnees[3*indice+2])/valmax);
img->_buffer[x][y] = c;
}
}
PPM_fermeture(ppm);
return(img);
}
else
return(NULL);
}
}
