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#include <assert.h>
#include "kitchensink/internal/subtitle/kitatlas.h"
#include "kitchensink/internal/utils/kitlog.h"
static int min(int a, int b) {
if(a < b)
return a;
return b;
}
Kit_TextureAtlas* Kit_CreateAtlas() {
Kit_TextureAtlas *atlas = calloc(1, sizeof(Kit_TextureAtlas));
if(atlas == NULL) {
goto exit_0;
}
atlas->cur_items = 0;
atlas->max_items = 1024;
atlas->max_shelves = 256;
atlas->w = 0;
atlas->h = 0;
// Allocate items. These hold the surfaces that should be in atlas
atlas->items = calloc(atlas->max_items, sizeof(Kit_TextureAtlasItem));
if(atlas->items == NULL) {
goto exit_1;
}
// Allocate shelves. These describe the used space of the atlas
atlas->shelves = calloc(atlas->max_shelves, sizeof(Kit_Shelf));
if(atlas->shelves == NULL) {
goto exit_2;
}
return atlas;
exit_2:
free(atlas->items);
exit_1:
free(atlas);
exit_0:
return NULL;
}
void Kit_ClearAtlasContent(Kit_TextureAtlas *atlas) {
atlas->cur_items = 0;
memset(atlas->items, 0, atlas->max_items * sizeof(Kit_TextureAtlasItem));
memset(atlas->shelves, 0, atlas->max_shelves * sizeof(Kit_Shelf));
}
void Kit_FreeAtlas(Kit_TextureAtlas *atlas) {
assert(atlas != NULL);
free(atlas->items);
free(atlas->shelves);
free(atlas);
}
void Kit_SetItemAllocation(Kit_TextureAtlasItem *item, SDL_Surface *surface, int shelf, int slot, int x, int y) {
assert(item != NULL);
item->cur_shelf = shelf;
item->cur_slot = slot;
item->source.x = x;
item->source.y = y;
item->source.w = surface->w;
item->source.h = surface->h;
}
int Kit_FindFreeAtlasSlot(Kit_TextureAtlas *atlas, SDL_Surface *surface, Kit_TextureAtlasItem *item) {
assert(atlas != NULL);
assert(item != NULL);
int shelf_w;
int shelf_h;
int total_remaining_h = atlas->h;
int total_reserved_h = 0;
// First, try to look for a good, existing shelf
int best_shelf_idx = -1;
int best_shelf_h = atlas->h;
int best_shelf_y = 0;
// Try to find a good shelf to put this item in
int shelf_idx;
for(shelf_idx = 0; shelf_idx < atlas->max_shelves; shelf_idx++) {
shelf_w = atlas->shelves[shelf_idx].width;
shelf_h = atlas->shelves[shelf_idx].height;
if(shelf_h == 0) {
break;
}
total_remaining_h -= shelf_h;
total_reserved_h += shelf_h;
// If the item fits, check if the space is better than previous one
if(surface->w <= (atlas->w - shelf_w) && surface->h <= shelf_h && shelf_h < best_shelf_h) {
best_shelf_h = shelf_h;
best_shelf_idx = shelf_idx;
best_shelf_y = total_reserved_h - shelf_h;
}
}
// If existing shelf found, put the item there. Otherwise create a new shelf.
if(best_shelf_idx != -1) {
Kit_SetItemAllocation(
item,
surface,
best_shelf_idx,
atlas->shelves[best_shelf_idx].count,
atlas->shelves[best_shelf_idx].width,
best_shelf_y);
atlas->shelves[best_shelf_idx].width += surface->w;
atlas->shelves[best_shelf_idx].count += 1;
return 0;
} else if(total_remaining_h >= surface->h) {
atlas->shelves[shelf_idx].width = surface->w;
atlas->shelves[shelf_idx].height = surface->h;
atlas->shelves[shelf_idx].count = 1;
Kit_SetItemAllocation(
item,
surface,
shelf_idx,
0,
0,
total_reserved_h);
return 0;
}
return 1; // Can't fit!
}
void Kit_CheckAtlasTextureSize(Kit_TextureAtlas *atlas, SDL_Texture *texture) {
assert(atlas != NULL);
assert(texture != NULL);
// Check if texture size has changed, and clear content if it has.
int texture_w;
int texture_h;
if(SDL_QueryTexture(texture, NULL, NULL, &texture_w, &texture_h) == 0) {
atlas->w = texture_w;
atlas->h = texture_h;
}
}
int Kit_GetAtlasItems(const Kit_TextureAtlas *atlas, SDL_Rect *sources, SDL_Rect *targets, int limit) {
assert(atlas != NULL);
assert(limit >= 0);
int max_count = min(atlas->cur_items, limit);
for(int i = 0; i < max_count; i++) {
Kit_TextureAtlasItem *item = &atlas->items[i];
if(sources != NULL)
memcpy(&sources[i], &item->source, sizeof(SDL_Rect));
if(targets != NULL)
memcpy(&targets[i], &item->target, sizeof(SDL_Rect));
}
return max_count;
}
int Kit_AddAtlasItem(Kit_TextureAtlas *atlas, SDL_Texture *texture, SDL_Surface *surface, const SDL_Rect *target) {
assert(atlas != NULL);
assert(surface != NULL);
assert(target != NULL);
// Make sure there is still room
if(atlas->cur_items >= atlas->max_items)
return -1;
// Create a new item
Kit_TextureAtlasItem item;
memset(&item, 0, sizeof(Kit_TextureAtlasItem));
memcpy(&item.target, target, sizeof(SDL_Rect));
item.cur_shelf = -1;
item.cur_slot = -1;
// Allocate space for the new item
if(Kit_FindFreeAtlasSlot(atlas, surface, &item) != 0) {
return -1;
}
// And update texture with the surface
SDL_UpdateTexture(texture, &item.source, surface->pixels, surface->pitch);
// Room found, add item to the atlas
memcpy(&atlas->items[atlas->cur_items++], &item, sizeof(Kit_TextureAtlasItem));
return 0;
}
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