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@@ -63,58 +63,70 @@ static SpriteCache *AllocateSpriteCache(
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struct MemBlock {
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size_t size;
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byte data[VARARRAY_SIZE];
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};
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static uint _sprite_lru_counter;
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static MemBlock *_spritecache_ptr;
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static int _compact_cache_counter;
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static void CompactSpriteCache();
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/**
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* Skip the given amount of sprite graphics data.
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* @param type the type of sprite (compressed etc)
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* @param num the amount of sprites to skip
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*/
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void SkipSpriteData(byte type, uint16 num)
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{
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if (type & 2) {
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FioSkipBytes(num);
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} else {
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while (num > 0) {
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int8 i = FioReadByte();
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if (i >= 0) {
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i = (i == 0) ? 0x80 : i;
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num -= i;
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FioSkipBytes(i);
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} else {
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i = -(i >> 3);
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num -= i;
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FioReadByte();
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}
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}
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}
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}
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/**
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* Read the sprite header data and then skip the real payload.
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* @return true if the sprite is a pseudo sprite.
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*/
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static bool ReadSpriteHeaderSkipData()
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{
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uint16 num = FioReadWord();
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byte type;
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if (num == 0) return false;
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type = FioReadByte();
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if (type == 0xFF) {
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FioSkipBytes(num);
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/* Some NewGRF files have "empty" pseudo-sprites which are 1
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* byte long. Catch these so the sprites won't be displayed. */
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return num != 1;
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}
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FioSkipBytes(7);
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num -= 8;
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if (num == 0) return true;
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if (type & 2) {
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FioSkipBytes(num);
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} else {
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while (num > 0) {
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int8 i = FioReadByte();
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if (i >= 0) {
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num -= i;
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FioSkipBytes(i);
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} else {
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i = -(i >> 3);
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num -= i;
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FioReadByte();
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}
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}
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}
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SkipSpriteData(type, num - 8);
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return true;
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}
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/* Check if the given Sprite ID exists */
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bool SpriteExists(SpriteID id)
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{
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/* Special case for Sprite ID zero -- its position is also 0... */
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if (id == 0) return true;
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if (id >= _spritecache_items) return false;
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return !(GetSpriteCache(id)->file_pos == 0 && GetSpriteCache(id)->file_slot == 0);
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}
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