Add color indexes to 32bpp sprites to make color remaps work

src/blitter/32bpp_anim_sse4.hpp

@@ -36,7 +36,7 @@ public:
 	void Draw(const Blitter::BlitterParams *bp, ZoomLevel zoom);
 	void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) override;
 	Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator) override {
-		return Blitter_32bppSSE_Base::Encode(sprite, allocator);
+		return Blitter_32bppSSE_Base::Encode(sprite, allocator, this);
 	}
 	const char *GetName() override { return "32bpp-sse4-anim"; }
 };

src/blitter/32bpp_base.hpp

@@ -154,6 +154,28 @@ public:
 
 		return ReallyAdjustBrightness(colour, brightness);
 	}
+
+
+	/* CM */
+	uint8 cm_mdict[64*64*64] = {0};
+	uint8 CM_GetMForRGB(uint8 r, uint8 g, uint8 b) {
+		r &= 252; g &= 252; b &= 252;
+		auto key = (r << 10) | (g << 4) | (b >> 2);
+		auto m = this->cm_mdict[key];
+		if (m != 0) return m;
+		uint md = UINT_MAX;
+		for (uint8 i = 1; i < 0xc0; i++) {
+			auto c = this->LookupColourInPalette(i);
+			auto dist = ((uint)c.r - r) * ((uint)c.r - r) + ((uint)c.g - g) * ((uint)c.g - g) + ((uint)c.b - b) * ((uint)c.b - b);
+			if (dist < md) {
+				md = dist;
+				m = i;
+			}
+		}
+		this->cm_mdict[key] = m;
+		return m;
+	}
+
 };
 
 #endif /* BLITTER_32BPP_BASE_HPP */

src/blitter/32bpp_optimized.cpp

@@ -339,6 +339,7 @@ Sprite *Blitter_32bppOptimized::Encode(const SpriteLoader::Sprite *sprite, Alloc
 						dst_px->r = src->r;
 						dst_px->g = src->g;
 						dst_px->b = src->b;
+						*dst_n = this->CM_GetMForRGB(src->r, src->g, src->b) | (DEFAULT_BRIGHTNESS << 8);
 					}
 					dst_px++;
 					dst_n++;

src/blitter/32bpp_simple.cpp

@@ -84,7 +84,6 @@ void Blitter_32bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, Zoo
 void Blitter_32bppSimple::DrawColourMappingRect(void *dst, int width, int height, PaletteID pal)
 {
 	Colour *udst = (Colour *)dst;
-
 	if (pal == PALETTE_TO_TRANSPARENT) {
 		do {
 			for (int i = 0; i != width; i++) {
@@ -128,8 +127,8 @@ Sprite *Blitter_32bppSimple::Encode(const SpriteLoader::Sprite *sprite, Allocato
 			dst[i].g = src->g;
 			dst[i].b = src->b;
 			dst[i].a = src->a;
-			dst[i].m = 0;
-			dst[i].v = 0;
+			dst[i].m = this->CM_GetMForRGB(src->r, src->g, src->b);
+			dst[i].v = DEFAULT_BRIGHTNESS;
 		} else {
 			/* Get brightest value */
 			uint8 rgb_max = max(src->r, max(src->g, src->b));

src/blitter/32bpp_sse2.cpp

@@ -20,7 +20,7 @@
 /** Instantiation of the SSE2 32bpp blitter factory. */
 static FBlitter_32bppSSE2 iFBlitter_32bppSSE2;
 
-Sprite *Blitter_32bppSSE_Base::Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator)
+Sprite *Blitter_32bppSSE_Base::Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator, Blitter_32bppSimple *base_blitter)
 {
 	/* First uint32 of a line = the number of transparent pixels from the left.
 	 * Second uint32 of a line = the number of transparent pixels from the right.
@@ -89,9 +89,11 @@ Sprite *Blitter_32bppSSE_Base::Encode(const SpriteLoader::Sprite *sprite, Alloca
 						dst_rgba->g = colour.g;
 						dst_rgba->b = colour.b;
 					} else {
+						has_remap = true;
 						dst_rgba->r = src->r;
 						dst_rgba->g = src->g;
 						dst_rgba->b = src->b;
+						dst_mv->m = base_blitter->CM_GetMForRGB(src->r, src->g, src->b);
 						dst_mv->v = Blitter_32bppBase::DEFAULT_BRIGHTNESS;
 					}
 				} else {

src/blitter/32bpp_sse2.hpp

@@ -72,7 +72,7 @@ public:
 		byte data[]; ///< Data, all zoomlevels.
 	};
 
-	Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator);
+	Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator, Blitter_32bppSimple *base_blitter);
 };
 
 DECLARE_ENUM_AS_BIT_SET(Blitter_32bppSSE_Base::SpriteFlags);
@@ -85,7 +85,7 @@ public:
 	void Draw(const Blitter::BlitterParams *bp, ZoomLevel zoom);
 
 	Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator) override {
-		return Blitter_32bppSSE_Base::Encode(sprite, allocator);
+		return Blitter_32bppSSE_Base::Encode(sprite, allocator, this);
 	}
 
 	const char *GetName() override { return "32bpp-sse2"; }