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Change: Skip creating a RealSpriteGroup when there is only one result.

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This avoids checking RSG for empty sets every time they are evaluated.
This might alter behaviour in cases of a malformed NewGRF file.
This commit is contained in:
Peter Nelson 2021-06-04 12:31:00 +01:00 committed by PeterN
parent f1328db063
commit 40cec34836
1 changed files with 42 additions and 13 deletions
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55
src/newgrf.cpp
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@ -109,7 +109,7 @@ public:
int skip_sprites; ///< Number of pseudo sprites to skip before processing the next one. (-1 to skip to end of file)
/* Currently referenceable spritegroups */
SpriteGroup *spritegroups[MAX_SPRITEGROUP + 1];
const SpriteGroup *spritegroups[MAX_SPRITEGROUP + 1];
/** Clear temporary data before processing the next file in the current loading stage */
void ClearDataForNextFile()
@ -4982,7 +4982,7 @@ static void NewSpriteGroup(ByteReader *buf)
* otherwise it specifies a number of entries, the exact
* meaning depends on the feature
* V feature-specific-data (huge mess, don't even look it up --pasky) */
SpriteGroup *act_group = nullptr;
const SpriteGroup *act_group = nullptr;
uint8 feature = buf->ReadByte();
if (feature >= GSF_END) {
@ -5163,24 +5163,53 @@ static void NewSpriteGroup(ByteReader *buf)
return;
}
grfmsg(6, "NewSpriteGroup: New SpriteGroup 0x%02X, %u loaded, %u loading",
setid, num_loaded, num_loading);
if (num_loaded + num_loading == 1) {
/* Avoid creating 'Real' sprite group if only one option. */
uint16 spriteid = buf->ReadWord();
act_group = CreateGroupFromGroupID(feature, setid, type, spriteid);
grfmsg(8, "NewSpriteGroup: one result, skipping RealSpriteGroup = subset %u", spriteid);
break;
}
std::vector<uint16> loaded;
std::vector<uint16> loading;
for (uint i = 0; i < num_loaded; i++) {
loaded.push_back(buf->ReadWord());
grfmsg(8, "NewSpriteGroup: + rg->loaded[%i] = subset %u", i, loaded[i]);
}
for (uint i = 0; i < num_loading; i++) {
loading.push_back(buf->ReadWord());
grfmsg(8, "NewSpriteGroup: + rg->loading[%i] = subset %u", i, loading[i]);
}
if (std::adjacent_find(loaded.begin(), loaded.end(), std::not_equal_to<>()) == loaded.end() &&
std::adjacent_find(loading.begin(), loading.end(), std::not_equal_to<>()) == loading.end() &&
loaded[0] == loading[0])
{
/* Both lists only contain the same value, so don't create 'Real' sprite group */
act_group = CreateGroupFromGroupID(feature, setid, type, loaded[0]);
grfmsg(8, "NewSpriteGroup: same result, skipping RealSpriteGroup = subset %u", loaded[0]);
break;
}
assert(RealSpriteGroup::CanAllocateItem());
RealSpriteGroup *group = new RealSpriteGroup();
group->nfo_line = _cur.nfo_line;
act_group = group;
grfmsg(6, "NewSpriteGroup: New SpriteGroup 0x%02X, %u loaded, %u loading",
setid, num_loaded, num_loading);
for (uint i = 0; i < num_loaded; i++) {
uint16 spriteid = buf->ReadWord();
group->loaded.push_back(CreateGroupFromGroupID(feature, setid, type, spriteid));
grfmsg(8, "NewSpriteGroup: + rg->loaded[%i] = subset %u", i, spriteid);
for (uint16 spriteid : loaded) {
const SpriteGroup *t = CreateGroupFromGroupID(feature, setid, type, spriteid);
group->loaded.push_back(t);
}
for (uint i = 0; i < num_loading; i++) {
uint16 spriteid = buf->ReadWord();
group->loading.push_back(CreateGroupFromGroupID(feature, setid, type, spriteid));
grfmsg(8, "NewSpriteGroup: + rg->loading[%i] = subset %u", i, spriteid);
for (uint16 spriteid : loading) {
const SpriteGroup *t = CreateGroupFromGroupID(feature, setid, type, spriteid);
group->loading.push_back(t);
}
break;