- optimized storage for animation definitions.

Instead of allocating everything on the heap as single blocks, use a value TArray and allocate the frame arrays from the texture manager's memory arena, since lifetime of the data is identical.
Most importantly this avoids using a variable size array at the end of the struct.

src/common/textures/textureid.h

@@ -35,7 +35,7 @@ public:
 	void SetNull() { texnum = 0; }
 	bool operator ==(const FTextureID &other) const { return texnum == other.texnum; }
 	bool operator !=(const FTextureID &other) const { return texnum != other.texnum; }
-	FTextureID operator +(int offset) throw();
+	FTextureID operator +(int offset) const noexcept(true);
 	int GetIndex() const { return texnum; }	// Use this only if you absolutely need the index!
 	void SetIndex(int index) { texnum = index; }	// Use this only if you absolutely need the index!
 

src/common/textures/texturemanager.cpp

@@ -1615,7 +1615,7 @@ void FTextureManager::AddAlias(const char* name, FGameTexture* tex)
 //
 //==========================================================================
 
-FTextureID FTextureID::operator +(int offset) throw()
+FTextureID FTextureID::operator +(int offset) const noexcept(true)
 {
 	if (!isValid()) return *this;
 	if (texnum + offset >= TexMan.NumTextures()) return FTextureID(-1);

src/gamedata/textures/animations.cpp

@@ -43,6 +43,7 @@
 #include "serializer.h"
 #include "animations.h"
 #include "texturemanager.h"
+#include "image.h"
 
 // MACROS ------------------------------------------------------------------
 
@@ -61,14 +62,6 @@ static FRandom pr_animatepictures ("AnimatePics");
 
 void FTextureAnimator::DeleteAll()
 {
-	for (unsigned i = 0; i < mAnimations.Size(); i++)
-	{
-		if (mAnimations[i] != NULL)
-		{
-			M_Free(mAnimations[i]);
-			mAnimations[i] = NULL;
-		}
-	}
 	mAnimations.Clear();
 
 	for (unsigned i = 0; i < mSwitchDefs.Size(); i++)
@@ -101,22 +94,21 @@ void FTextureAnimator::DeleteAll()
 //
 //==========================================================================
 
-FAnimDef *FTextureAnimator::AddAnim (FAnimDef *anim)
+FAnimDef *FTextureAnimator::AddAnim (FAnimDef& anim)
 {
 	// Search for existing duplicate.
 	for (unsigned int i = 0; i < mAnimations.Size(); ++i)
 	{
-		if (mAnimations[i]->BasePic == anim->BasePic)
+		if (mAnimations[i].BasePic == anim.BasePic)
 		{
 			// Found one!
-			M_Free (mAnimations[i]);
 			mAnimations[i] = anim;
-			return anim;
+			return &anim;
 		}
 	}
 	// Didn't find one, so add it at the end.
 	mAnimations.Push (anim);
-	return anim;
+	return &anim;
 }
 
 //==========================================================================
@@ -132,19 +124,20 @@ FAnimDef *FTextureAnimator::AddSimpleAnim (FTextureID picnum, int animcount, uin
 {
 	if (TexMan.AreTexturesCompatible(picnum, picnum + (animcount - 1)))
 	{
-		FAnimDef *anim = (FAnimDef *)M_Malloc (sizeof(FAnimDef));
-		anim->CurFrame = 0;
-		anim->BasePic = picnum;
-		anim->NumFrames = animcount;
-		anim->AnimType = FAnimDef::ANIM_Forward;
-		anim->bDiscrete = false;
-		anim->SwitchTime = 0;
-		anim->Frames[0].SpeedMin = speedmin;
-		anim->Frames[0].SpeedRange = speedrange;
-		anim->Frames[0].FramePic = anim->BasePic;
+		FAnimDef anim;
+		anim.CurFrame = 0;
+		anim.BasePic = picnum;
+		anim.NumFrames = animcount;
+		anim.AnimType = FAnimDef::ANIM_Forward;
+		anim.bDiscrete = false;
+		anim.SwitchTime = 0;
+		anim.Frames = (FAnimDef::FAnimFrame*)ImageArena.Alloc(sizeof(FAnimDef::FAnimFrame));
+		anim.Frames[0].SpeedMin = speedmin;
+		anim.Frames[0].SpeedRange = speedrange;
+		anim.Frames[0].FramePic = anim.BasePic;
 		return AddAnim (anim);
 	}
-	return NULL;
+	return nullptr;
 }
 
 //==========================================================================
@@ -157,14 +150,15 @@ FAnimDef *FTextureAnimator::AddSimpleAnim (FTextureID picnum, int animcount, uin
 
 FAnimDef *FTextureAnimator::AddComplexAnim (FTextureID picnum, const TArray<FAnimDef::FAnimFrame> &frames)
 {
-	FAnimDef *anim = (FAnimDef *)M_Malloc (sizeof(FAnimDef) + (frames.Size()-1) * sizeof(frames[0]));
-	anim->BasePic = picnum;
-	anim->NumFrames = frames.Size();
-	anim->CurFrame = 0;
-	anim->AnimType = FAnimDef::ANIM_Forward;
-	anim->bDiscrete = true;
-	anim->SwitchTime = 0;
-	memcpy (&anim->Frames[0], &frames[0], frames.Size() * sizeof(frames[0]));
+	FAnimDef anim;
+	anim.BasePic = picnum;
+	anim.NumFrames = frames.Size();
+	anim.CurFrame = 0;
+	anim.AnimType = FAnimDef::ANIM_Forward;
+	anim.bDiscrete = true;
+	anim.SwitchTime = 0;
+	anim.Frames = (FAnimDef::FAnimFrame*)ImageArena.Alloc(frames.Size() * sizeof(frames[0]));
+	memcpy (&anim.Frames[0], &frames[0], frames.Size() * sizeof(frames[0]));
 	return AddAnim (anim);
 }
 
@@ -783,7 +777,7 @@ void FTextureAnimator::FixAnimations ()
 
 	for (i = 0; i < mAnimations.Size(); ++i)
 	{
-		FAnimDef *anim = mAnimations[i];
+		const FAnimDef *anim = &mAnimations[i];
 		if (!anim->bDiscrete)
 		{
 			bool nodecals;
@@ -928,7 +922,7 @@ void FTextureAnimator::UpdateAnimations (uint64_t mstime)
 {
 	for (unsigned int j = 0; j < mAnimations.Size(); ++j)
 	{
-		FAnimDef *anim = mAnimations[j];
+		FAnimDef *anim = &mAnimations[j];
 
 		// If this is the first time through R_UpdateAnimations, just
 		// initialize the anim's switch time without actually animating.

src/gamedata/textures/animations.h

@@ -7,18 +7,20 @@
 
 struct FAnimDef
 {
+	struct FAnimFrame
+	{
+		uint32_t	SpeedMin;		// Speeds are in ms, not tics
+		uint32_t	SpeedRange;
+		FTextureID	FramePic;
+	};
+
 	FTextureID 	BasePic;
 	uint16_t	NumFrames;
 	uint16_t	CurFrame;
 	uint8_t	AnimType;
 	bool	bDiscrete;			// taken out of AnimType to have better control
 	uint64_t	SwitchTime;			// Time to advance to next frame
-	struct FAnimFrame
-	{
-		uint32_t	SpeedMin;		// Speeds are in ms, not tics
-		uint32_t	SpeedRange;
-		FTextureID	FramePic;
-	} Frames[1];
+	FAnimFrame* Frames;
 	enum
 	{
 		ANIM_Forward,
@@ -59,7 +61,7 @@ struct FDoorAnimation
 
 class FTextureAnimator
 {
-	TArray<FAnimDef*> mAnimations;
+	TArray<FAnimDef> mAnimations;
 	TArray<FSwitchDef*> mSwitchDefs;
 	TArray<FDoorAnimation> mAnimatedDoors;
 
@@ -88,7 +90,7 @@ public:
 	}
 
 	// Animation stuff
-	FAnimDef* AddAnim(FAnimDef* anim);
+	FAnimDef* AddAnim(FAnimDef& anim);
 	void DeleteAll();
 
 	FAnimDef* AddSimpleAnim(FTextureID picnum, int animcount, uint32_t speedmin, uint32_t speedrange = 0);
@@ -98,7 +100,7 @@ public:
 	FDoorAnimation* FindAnimatedDoor(FTextureID picnum);
 	void UpdateAnimations(uint64_t mstime);
 
-	const TArray<FAnimDef*>& GetAnimations() const { return mAnimations; }
+	const TArray<FAnimDef>& GetAnimations() const { return mAnimations; }
 
 	void Init()
 	{

src/p_setup.cpp

@@ -102,11 +102,11 @@ static void AddToList(uint8_t *hitlist, FTextureID texid, int bitmask)
 
 	const auto addAnimations = [hitlist, bitmask](const FTextureID texid)
 	{
-		for (auto anim : TexAnim.GetAnimations())
+		for (auto& anim : TexAnim.GetAnimations())
 		{
-			if (texid == anim->BasePic || (!anim->bDiscrete && anim->BasePic < texid && texid < anim->BasePic + anim->NumFrames))
+			if (texid == anim.BasePic || (!anim.bDiscrete && anim.BasePic < texid && texid < anim.BasePic + anim.NumFrames))
 			{
-				for (int i = anim->BasePic.GetIndex(); i < anim->BasePic.GetIndex() + anim->NumFrames; i++)
+				for (int i = anim.BasePic.GetIndex(); i < anim.BasePic.GetIndex() + anim.NumFrames; i++)
 				{
 					hitlist[i] |= (uint8_t)bitmask;
 				}