Remove branches that can't be taken under OS3

Micro-optimise these for OS4.1
Remove dummy compositing defines from os3support.h

amiga/bitmap.c

@@ -367,7 +367,7 @@ struct bitmap *ami_bitmap_from_datatype(char *filename)
 	return bm;
 }
 
-static struct BitMap *ami_bitmap_get_truecolour(struct bitmap *bitmap,int width,int height,struct BitMap *friendbm)
+static inline struct BitMap *ami_bitmap_get_truecolour(struct bitmap *bitmap,int width,int height,struct BitMap *friendbm)
 {
 	struct BitMap *tbm = NULL;
 
@@ -414,10 +414,9 @@ static struct BitMap *ami_bitmap_get_truecolour(struct bitmap *bitmap,int width,
 
 		scaledbm = ami_rtg_allocbitmap(width, height, 32, 0,
 									friendbm, AMI_BITMAP_FORMAT);
-
-		if(GfxBase->LibNode.lib_Version >= 53) // AutoDoc says v52, but this function isn't in OS4.0, so checking for v53 (OS4.1)
-		{
 #ifdef __amigaos4__
+		if(__builtin_expect(GfxBase->LibNode.lib_Version >= 53, 1)) {
+		/* AutoDoc says v52, but this function isn't in OS4.0, so checking for v53 (OS4.1) */
 			uint32 flags = 0;
 			if(nsoption_bool(scale_quality)) flags |= COMPFLAG_SrcFilter;
 			
@@ -433,9 +432,8 @@ static struct BitMap *ami_bitmap_get_truecolour(struct bitmap *bitmap,int width,
 						COMPTAG_OffsetY,0,
 						COMPTAG_FriendBitMap, scrn->RastPort.BitMap,
 						TAG_DONE);
+		} else /* Do it the old-fashioned way.  This is pretty slow, even on OS4.1 */
 #endif
-		}
-		else /* Do it the old-fashioned way.  This is pretty slow, even on OS4.1 */
 		{
 			bsa.bsa_SrcX = 0;
 			bsa.bsa_SrcY = 0;
@@ -500,7 +498,7 @@ PLANEPTR ami_bitmap_get_mask(struct bitmap *bitmap, int width,
 	return bitmap->native_mask;
 }
 
-static struct BitMap *ami_bitmap_get_palettemapped(struct bitmap *bitmap,
+static inline struct BitMap *ami_bitmap_get_palettemapped(struct bitmap *bitmap,
 					int width, int height)
 {
 	struct BitMap *dtbm;
@@ -547,7 +545,7 @@ static struct BitMap *ami_bitmap_get_palettemapped(struct bitmap *bitmap,
 struct BitMap *ami_bitmap_get_native(struct bitmap *bitmap,
 				int width, int height, struct BitMap *friendbm)
 {
-	if(ami_plot_screen_is_palettemapped() == true) {
+	if(__builtin_expect(ami_plot_screen_is_palettemapped() == true, 0)) {
 		return ami_bitmap_get_palettemapped(bitmap, width, height);
 	} else {
 		return ami_bitmap_get_truecolour(bitmap, width, height, friendbm);

amiga/os3support.h

@@ -189,25 +189,6 @@ struct OutlineFont {
 	struct TagItem *olf_OTagList;
 };
 
-/* Compositing */
-#define COMPFLAG_IgnoreDestAlpha 0
-#define COMPFLAG_SrcAlphaOverride 0
-#define COMPFLAG_SrcFilter 0
-
-#define COMPOSITE_Src 0
-
-#define COMPTAG_ScaleX 0
-#define COMPTAG_ScaleY 0
-#define COMPTAG_DestX 0
-#define COMPTAG_DestY 0
-#define COMPTAG_DestWidth 0
-#define COMPTAG_DestHeight 0
-#define COMPTAG_OffsetX 0
-#define COMPTAG_OffsetY 0
-
-#define CompositeTags(a, ...) ((void) (a))
-#define COMP_FLOAT_TO_FIX(f) (f)
-
 /* icon.library v51 (ie. AfA_OS version) */
 #define ICONCTRLA_SetImageDataFormat        (ICONA_Dummy + 0x67) /*103*/
 #define ICONCTRLA_GetImageDataFormat        (ICONA_Dummy + 0x68) /*104*/

amiga/plotters.c

@@ -501,10 +501,9 @@ static bool ami_bitmap(int x, int y, int width, int height, struct bitmap *bitma
 	LOG(("[ami_plotter] ami_bitmap() got native bitmap"));
 	#endif
 
-	if((GfxBase->LibNode.lib_Version >= 53) && (palette_mapped == false) &&
-		(nsoption_bool(direct_render) == false))
-	{
 #ifdef __amigaos4__
+	if(__builtin_expect((GfxBase->LibNode.lib_Version >= 53) && (palette_mapped == false) &&
+		(nsoption_bool(direct_render) == false), 1)) {
 		uint32 comptype = COMPOSITE_Src_Over_Dest;
 		uint32 compflags = COMPFLAG_IgnoreDestAlpha;
 		if(bitmap_get_opaque(bitmap)) {
@@ -524,9 +523,9 @@ static bool ami_bitmap(int x, int y, int width, int height, struct bitmap *bitma
 					COMPTAG_OffsetY,y,
 					COMPTAG_FriendBitMap, scrn->RastPort.BitMap,
 					TAG_DONE);
-#endif
 	}
 	else
+#endif
 	{
 		ULONG tag, tag_data, minterm = 0xc0;
 		
@@ -710,10 +709,9 @@ static void ami_bitmap_tile_hook(struct Hook *hook,struct RastPort *rp,struct Ba
 	/* tile down and across to extents  (bfmsg->Bounds.MinX)*/
 	for (xf = -bfbm->offsetx; xf < bfmsg->Bounds.MaxX; xf += bfbm->width) {
 		for (yf = -bfbm->offsety; yf < bfmsg->Bounds.MaxY; yf += bfbm->height) {
-
-			if((GfxBase->LibNode.lib_Version >= 53) && (palette_mapped == false))
-			{
 #ifdef __amigaos4__
+			if(__builtin_expect((GfxBase->LibNode.lib_Version >= 53) &&
+				(palette_mapped == false), 1)) {
 				CompositeTags(COMPOSITE_Src_Over_Dest, bfbm->bm, rp->BitMap,
 					COMPTAG_Flags, COMPFLAG_IgnoreDestAlpha,
 					COMPTAG_DestX,bfmsg->Bounds.MinX,
@@ -726,9 +724,9 @@ static void ami_bitmap_tile_hook(struct Hook *hook,struct RastPort *rp,struct Ba
 					COMPTAG_OffsetY,yf,
 					COMPTAG_FriendBitMap, scrn->RastPort.BitMap,
 					TAG_DONE);
-#endif
 			}
 			else
+#endif
 			{
 				ULONG tag, tag_data, minterm = 0xc0;
 		

amiga/thumbnail.c

@@ -70,8 +70,9 @@ bool thumbnail_create(hlcache_handle *content, struct bitmap *bitmap,
 
 	thumbnail_redraw(content, plot_width, plot_height, &ctx);
 
-	if(GfxBase->LibNode.lib_Version >= 53) // AutoDoc says v52, but this function isn't in OS4.0, so checking for v53 (OS4.1)
+#ifdef __amigaos4__
-	{
+	if(__builtin_expect(GfxBase->LibNode.lib_Version >= 53, 1)) {
+	/* AutoDoc says v52, but this function isn't in OS4.0, so checking for v53 (OS4.1) */
 		float resample_scale = bitmap->width / (float)plot_width;
 		uint32 flags = COMPFLAG_IgnoreDestAlpha;
 		if(nsoption_bool(scale_quality)) flags |= COMPFLAG_SrcFilter;
@@ -90,8 +91,8 @@ bool thumbnail_create(hlcache_handle *content, struct bitmap *bitmap,
 					COMPTAG_OffsetY,0,
 					COMPTAG_FriendBitMap, scrn->RastPort.BitMap,
 					TAG_DONE);
-	}
+	} else
-	else
+#endif
 	{
 		bsa.bsa_SrcX = 0;
 		bsa.bsa_SrcY = 0;