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#include "ppport.h"
#include "helper.h"
typedef struct SDLx_LayerManager
{
AV *layers;
SDL_Surface *saveshot;
SDL_Surface *dest;
int saved;
} SDLx_LayerManager;
typedef struct SDLx_Layer
{
SDLx_LayerManager *manager;
int index;
int attached;
int touched;
SDL_Surface *surface;
SDL_Rect *clip;
SDL_Rect *pos;
SDL_Rect *attached_pos;
SDL_Rect *attached_rel;
HV *data;
} SDLx_Layer;
int intersection( SDLx_Layer *layer1, SDLx_Layer *layer2 )
{
if(
/* upper left point inside layer */
( layer1->pos->x <= layer2->pos->x
&& layer2->pos->x < layer1->pos->x + layer1->clip->w
&& layer1->pos->y <= layer2->pos->y
&& layer2->pos->y < layer1->pos->y + layer1->clip->h
)
/* upper right point inside layer */
|| ( layer1->pos->x < layer2->pos->x + layer2->clip->w
&& layer2->pos->x + layer2->clip->w <= layer1->pos->x + layer1->clip->w
&& layer1->pos->y <= layer2->pos->y
&& layer2->pos->y < layer1->pos->y + layer1->clip->h )
/* lower left point inside layer */
|| ( layer1->pos->x <= layer2->pos->x
&& layer2->pos->x < layer1->pos->x + layer1->clip->w
&& layer1->pos->y < layer2->pos->y + layer2->clip->h
&& layer2->pos->y + layer2->clip->h <= layer1->pos->y + layer1->clip->h )
/* lower right point inside layer */
|| ( layer1->pos->x < layer2->pos->x + layer2->clip->w
&& layer2->pos->x + layer2->clip->w <= layer1->pos->x + layer1->clip->w
&& layer1->pos->y < layer2->pos->y + layer2->clip->h
&& layer2->pos->y + layer2->clip->h <= layer1->pos->y + layer1->clip->h )
){
return 1;
}
return 0;
}
AV *layers_behind( SDLx_Layer *layer)
{
AV *matches = newAV();
int i;
int count = 0;
for( i = layer->index - 1; i >= 0; i-- )
{
SV *bag = *av_fetch(layer->manager->layers, i, 0);
SDLx_Layer *layer2 = (SDLx_Layer *)bag2obj(bag);
if(intersection( layer, layer2 ) || intersection( layer2, layer ))
{
/* TODO checking transparency */
SvREFCNT_inc(bag);
av_store( matches, count, bag );
count++;
}
}
if(count)
{
AV *behind = layers_behind((SDLx_Layer *)bag2obj(*av_fetch(matches, av_len(matches), 0)));
if(av_len(behind) >= 0)
{
for( i = 0; i <= av_len(behind); i++ )
{
av_store( matches, count, *av_fetch(behind, i, 0));
count++;
}
}
}
return matches;
}
AV *layers_ahead( SDLx_Layer *layer )
{
AV *matches = newAV();
int i;
int count = 0;
for( i = layer->index + 1; i <= av_len(layer->manager->layers); i++ )
{
SV *bag = *av_fetch(layer->manager->layers, i, 0);
SDLx_Layer *layer2 = (SDLx_Layer *)bag2obj(bag);
if(intersection( layer, layer2 ) || intersection( layer2, layer ))
{
/* TODO checking transparency */
SvREFCNT_inc(bag);
av_store( matches, count, bag );
count++;
}
}
if(count)
{
AV *ahead = layers_ahead((SDLx_Layer *)bag2obj(*av_fetch(matches, av_len(matches), 0)));
if(av_len(ahead) >= 0)
{
for( i = 0; i <= av_len(ahead); i++ )
{
av_store( matches, count, *av_fetch(ahead, i, 0));
count++;
}
}
}
return matches;
}
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