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#include <SDL.h>
#include <SDL_image.h>
#include <stdlib.h>
/*
* this program loads a few picture files and creates a file with information
* for the program for the scroller
* the input pictures must be .PNG
*
* the data file should allow for any number of layers, each layer can be up to 480 pixel high
* but can have a different width
* you must specify the speed by which the image is moved with 2 numbers. the speed
* will actually be the fraction of number one and two
*
* so you can create a standing background image by specifying a 0 for speed
*/
/*
* ok this structure contains the data for one layer
*/
typedef struct layer {
unsigned int xpos, ypos;
unsigned int width, height;
unsigned int numerator, denominator;
unsigned int xrepeat;
SDL_Surface * colors;
SDL_Surface * mask;
struct layer * next;
} layer;
/*
* the layer list anchor
*/
layer * layer_ancor = NULL;
Uint8 get_color(SDL_Surface *s, int x, int y) {
return ((Uint8*)s->pixels)[y*s->pitch+x];
}
Uint8 get_alpha(SDL_Surface *s, int x, int y) {
return s->format->palette->colors[((Uint8*)s->pixels)[y*s->pitch+x]].r;
}
void write_palette(FILE *out, SDL_Surface *s) {
int i;
Uint8 c = s->format->palette->ncolors - 1;
fwrite(&c, 1, 1, out);
for (i = 0; i < s->format->palette->ncolors; i++) {
fwrite(&s->format->palette->colors[i].r, 1, 1, out);
fwrite(&s->format->palette->colors[i].g, 1, 1, out);
fwrite(&s->format->palette->colors[i].b, 1, 1, out);
}
}
void write_uint(unsigned int x, FILE * out) {
unsigned char c;
c = x & 0xff;
fwrite(&c, 1, 1, out);
c = x >> 8;
fwrite(&c, 1, 1, out);
}
/*
* writes on layer to the file
*/
void write_layer(layer * l, FILE * out) {
int x, y;
static int first = 0;
Uint8 b;
write_uint(l->xpos, out);
write_uint(l->ypos, out);
write_uint(l->width, out);
write_uint(l->height, out);
write_uint(l->numerator, out);
write_uint(l->denominator, out);
write_uint(l->xrepeat, out);
write_palette(out, l->colors);
for (y = 0; y < l->height; y++)
for (x = 0; x < l->width; x++) {
b = get_color(l->colors, x, y);
fwrite(&b, 1, 1, out);
if (first) {
b = get_alpha(l->mask, x, y);
fwrite(&b, 1, 1, out);
}
}
first = 1;
}
void save(layer * l, FILE * o) {
if (l) {
save(l->next, o);
write_layer(l, o);
}
}
/*
*
* scroller number_of_layers tower_pos tower_spd_num/tower_spd_den \
* [ pic_file mask_file xpos/ypos/xrepeat spd_num/spd_den ]...
*/
int main(int argv, char* args[]) {
int l;
int layers; // number of layers
unsigned int towerpos;
unsigned int towerspeed_num, towerspeed_den;
if (argv < 3) return 1;
printf("start\n");
sscanf(args[1], "%i", &layers);
printf("generating %i layers\n", layers);
sscanf(args[2], "%i", &towerpos);
sscanf(args[3], "%i/%i", &towerspeed_num, &towerspeed_den);
printf("putting tower as layer %i with speed %i/%i\n", towerpos, towerspeed_num, towerspeed_den);
for (l = 0; l < layers; l++) {
layer * la = (layer*)malloc(sizeof(layer));
if (l == towerpos) printf("tower, speed %i/%i\n", towerspeed_num, towerspeed_den);
la->colors = IMG_LoadPNG_RW(SDL_RWFromFile(args[4+4*l], "rb"));
la->mask = IMG_LoadPNG_RW(SDL_RWFromFile(args[4+4*l+1], "rb"));
la->width = la->colors->w;
la->height = la->colors->h;
sscanf(args[4+4*l+2], "%i/%i/%i", &la->xpos, &la->ypos, &la->xrepeat);
sscanf(args[4+4*l+3], "%i/%i", &la->numerator, &la->denominator);
printf("image %s, size (%i,%i), at (%i,%i), speed %i/%i, repeat %i\n", args[4+4*l],
la->width, la->height,
la->xpos, la->ypos,
la->numerator, la->denominator,
la->xrepeat);
la->next = layer_ancor;
layer_ancor = la;
}
printf("\n saving...\n");
FILE * o = fopen("scroller.dat", "wb");
fwrite(&layers, 1, 1, o);
fwrite(&towerpos, 1, 1, o);
write_uint(towerspeed_num, o);
write_uint(towerspeed_den, o);
save(layer_ancor, o);
return 0;
}
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