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changeset 18821:66b1885b930f draft

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(svn r23670) -Feature: Add ability to adjust brightness of colour after remapping for 32bpp sprites
author peter1138 <peter1138@openttd.org>
date Sat, 24 Dec 2011 23:33:45 +0000
parents a41700432ff5
children 010cf3e799f7
files src/blitter/32bpp_anim.cpp src/blitter/32bpp_anim.hpp src/blitter/32bpp_base.hpp src/blitter/32bpp_optimized.cpp src/blitter/32bpp_simple.cpp src/blitter/32bpp_simple.hpp src/spriteloader/png.cpp
diffstat 7 files changed, 130 insertions(+), 69 deletions(-) [+]
line wrap: on
line diff
--- a/src/blitter/32bpp_anim.cpp
+++ b/src/blitter/32bpp_anim.cpp
@@ -25,27 +25,27 @@
 	const SpriteData *src = (const SpriteData *)bp->sprite;
 
 	const Colour *src_px = (const Colour *)(src->data + src->offset[zoom][0]);
-	const uint8  *src_n  = (const uint8  *)(src->data + src->offset[zoom][1]);
+	const uint16 *src_n  = (const uint16 *)(src->data + src->offset[zoom][1]);
 
 	for (uint i = bp->skip_top; i != 0; i--) {
 		src_px = (const Colour *)((const byte *)src_px + *(const uint32 *)src_px);
-		src_n += *(const uint32 *)src_n;
+		src_n  = (const uint16 *)((const byte *)src_n  + *(const uint32 *)src_n);
 	}
 
 	uint32 *dst = (uint32 *)bp->dst + bp->top * bp->pitch + bp->left;
-	uint8 *anim = this->anim_buf + ((uint32 *)bp->dst - (uint32 *)_screen.dst_ptr) + bp->top * this->anim_buf_width + bp->left;
+	uint16 *anim = this->anim_buf + ((uint32 *)bp->dst - (uint32 *)_screen.dst_ptr) + bp->top * this->anim_buf_width + bp->left;
 
 	const byte *remap = bp->remap; // store so we don't have to access it via bp everytime
 
 	for (int y = 0; y < bp->height; y++) {
 		uint32 *dst_ln = dst + bp->pitch;
-		uint8 *anim_ln = anim + this->anim_buf_width;
+		uint16 *anim_ln = anim + this->anim_buf_width;
 
 		const Colour *src_px_ln = (const Colour *)((const byte *)src_px + *(const uint32 *)src_px);
 		src_px++;
 
-		const uint8 *src_n_ln = src_n + *(const uint32 *)src_n;
-		src_n += 4;
+		const uint16 *src_n_ln = (const uint16 *)((const byte *)src_n + *(const uint32 *)src_n);
+		src_n += 2;
 
 		uint32 *dst_end = dst + bp->skip_left;
 
@@ -106,9 +106,9 @@
 								*dst = src_px->data;
 								*anim = 0;
 							} else {
-								uint r = remap[m];
-								*anim = r;
-								if (r != 0) *dst = this->LookupColourInPalette(r);
+								uint r = remap[GB(m, 0, 8)];
+								*anim = r | (m & 0xFF00);
+								if (r != 0) *dst = this->AdjustBrightness(this->LookupColourInPalette(r), GB(m, 8, 8));
 							}
 							anim++;
 							dst++;
@@ -122,9 +122,9 @@
 								*dst = ComposeColourRGBANoCheck(src_px->r, src_px->g, src_px->b, src_px->a, *dst);
 								*anim = 0;
 							} else {
-								uint r = remap[m];
+								uint r = remap[GB(m, 0, 8)];
 								*anim = 0;
-								if (r != 0) *dst = ComposeColourPANoCheck(this->LookupColourInPalette(r), src_px->a, *dst);
+								if (r != 0) *dst = ComposeColourPANoCheck(this->AdjustBrightness(this->LookupColourInPalette(r), GB(m, 8, 8)), src_px->a, *dst);
 							}
 							anim++;
 							dst++;
@@ -145,14 +145,14 @@
 						src_px += n;
 						do {
 							*dst = MakeTransparent(*dst, 3, 4);
-							*anim = remap[*anim];
+							*anim = 0;
 							anim++;
 							dst++;
 						} while (--n != 0);
 					} else {
 						do {
 							*dst = MakeTransparent(*dst, (256 * 4 - src_px->a), 256 * 4);
-							*anim = remap[*anim];
+							*anim = 0;
 							anim++;
 							dst++;
 							src_px++;
@@ -164,23 +164,25 @@
 					if (src_px->a == 255) {
 						do {
 							/* Compiler assumes pointer aliasing, can't optimise this on its own */
-							uint m = *src_n++;
+							uint m = GB(*src_n, 0, 8);
 							/* Above PALETTE_ANIM_START is palette animation */
-							*anim++ = m;
-							*dst++ = (m >= PALETTE_ANIM_START) ? this->LookupColourInPalette(m) : src_px->data;
+							*anim++ = *src_n;
+							*dst++ = (m >= PALETTE_ANIM_START) ? this->AdjustBrightness(this->LookupColourInPalette(m), GB(*src_n, 8, 8)) : src_px->data;
 							src_px++;
+							src_n++;
 						} while (--n != 0);
 					} else {
 						do {
-							uint m = *src_n++;
+							uint m = GB(*src_n, 0, 8);
 							*anim++ = 0;
 							if (m >= PALETTE_ANIM_START) {
-								*dst = ComposeColourPANoCheck(this->LookupColourInPalette(m), src_px->a, *dst);
+								*dst = ComposeColourPANoCheck(this->AdjustBrightness(this->LookupColourInPalette(m), GB(*src_n, 8, 8)), src_px->a, *dst);
 							} else {
 								*dst = ComposeColourRGBANoCheck(src_px->r, src_px->g, src_px->b, src_px->a, *dst);
 							}
 							dst++;
 							src_px++;
+							src_n++;
 						} while (--n != 0);
 					}
 					break;
@@ -219,7 +221,7 @@
 	}
 
 	uint32 *udst = (uint32 *)dst;
-	uint8 *anim;
+	uint16 *anim;
 
 	anim = this->anim_buf + ((uint32 *)dst - (uint32 *)_screen.dst_ptr);
 
@@ -259,7 +261,7 @@
 
 	/* Set the colour in the anim-buffer too, if we are rendering to the screen */
 	if (_screen_disable_anim) return;
-	this->anim_buf[((uint32 *)video - (uint32 *)_screen.dst_ptr) + x + y * this->anim_buf_width] = colour;
+	this->anim_buf[((uint32 *)video - (uint32 *)_screen.dst_ptr) + x + y * this->anim_buf_width] = colour | (DEFAULT_BRIGHTNESS << 8);
 }
 
 void Blitter_32bppAnim::DrawRect(void *video, int width, int height, uint8 colour)
@@ -271,18 +273,18 @@
 	}
 
 	uint32 colour32 = LookupColourInPalette(colour);
-	uint8 *anim_line;
+	uint16 *anim_line;
 
 	anim_line = ((uint32 *)video - (uint32 *)_screen.dst_ptr) + this->anim_buf;
 
 	do {
 		uint32 *dst = (uint32 *)video;
-		uint8 *anim = anim_line;
+		uint16 *anim = anim_line;
 
 		for (int i = width; i > 0; i--) {
 			*dst = colour32;
 			/* Set the colour in the anim-buffer too */
-			*anim = colour;
+			*anim = colour | (DEFAULT_BRIGHTNESS << 8);
 			dst++;
 			anim++;
 		}
@@ -297,19 +299,19 @@
 	assert(video >= _screen.dst_ptr && video <= (uint32 *)_screen.dst_ptr + _screen.width + _screen.height * _screen.pitch);
 	uint32 *dst = (uint32 *)video;
 	const uint32 *usrc = (const uint32 *)src;
-	uint8 *anim_line = ((uint32 *)video - (uint32 *)_screen.dst_ptr) + this->anim_buf;
+	uint16 *anim_line = ((uint32 *)video - (uint32 *)_screen.dst_ptr) + this->anim_buf;
 
 	for (; height > 0; height--) {
 		/* We need to keep those for palette animation. */
 		uint32 *dst_pal = dst;
-		uint8 *anim_pal = anim_line;
+		uint16 *anim_pal = anim_line;
 
 		memcpy(dst, usrc, width * sizeof(uint32));
 		usrc += width;
 		dst += _screen.pitch;
 		/* Copy back the anim-buffer */
-		memcpy(anim_line, usrc, width * sizeof(uint8));
-		usrc = (const uint32 *)((const uint8 *)usrc + width);
+		memcpy(anim_line, usrc, width * sizeof(uint16));
+		usrc = (const uint32 *)((const uint16 *)usrc + width);
 		anim_line += this->anim_buf_width;
 
 		/* Okay, it is *very* likely that the image we stored is using
@@ -320,10 +322,10 @@
 		 * for just the cursor. This just copies the implementation of
 		 * palette animation, much cheaper though slightly nastier. */
 		for (int i = 0; i < width; i++) {
-			uint colour = *anim_pal;
+			uint colour = GB(*anim_pal, 0, 8);
 			if (IsInsideBS(colour, PALETTE_ANIM_START, PALETTE_ANIM_SIZE)) {
 				/* Update this pixel */
-				*dst_pal = LookupColourInPalette(colour);
+				*dst_pal = this->AdjustBrightness(LookupColourInPalette(colour), GB(*anim_pal, 8, 8));
 			}
 			dst_pal++;
 			anim_pal++;
@@ -337,7 +339,7 @@
 	assert(video >= _screen.dst_ptr && video <= (uint32 *)_screen.dst_ptr + _screen.width + _screen.height * _screen.pitch);
 	uint32 *udst = (uint32 *)dst;
 	const uint32 *src = (const uint32 *)video;
-	const uint8 *anim_line;
+	const uint16 *anim_line;
 
 	if (this->anim_buf == NULL) return;
 
@@ -348,8 +350,8 @@
 		src += _screen.pitch;
 		udst += width;
 		/* Copy the anim-buffer */
-		memcpy(udst, anim_line, width * sizeof(uint8));
-		udst = (uint32 *)((uint8 *)udst + width);
+		memcpy(udst, anim_line, width * sizeof(uint16));
+		udst = (uint32 *)((uint16 *)udst + width);
 		anim_line += this->anim_buf_width;
 	}
 }
@@ -358,7 +360,7 @@
 {
 	assert(!_screen_disable_anim);
 	assert(video >= _screen.dst_ptr && video <= (uint32 *)_screen.dst_ptr + _screen.width + _screen.height * _screen.pitch);
-	uint8 *dst, *src;
+	uint16 *dst, *src;
 
 	/* We need to scroll the anim-buffer too */
 	if (scroll_y > 0) {
@@ -375,7 +377,7 @@
 		uint tw = width + (scroll_x >= 0 ? -scroll_x : scroll_x);
 		uint th = height - scroll_y;
 		for (; th > 0; th--) {
-			memcpy(dst, src, tw * sizeof(uint8));
+			memcpy(dst, src, tw * sizeof(uint16));
 			src -= this->anim_buf_width;
 			dst -= this->anim_buf_width;
 		}
@@ -396,7 +398,7 @@
 		uint tw = width + (scroll_x >= 0 ? -scroll_x : scroll_x);
 		uint th = height + scroll_y;
 		for (; th > 0; th--) {
-			memmove(dst, src, tw * sizeof(uint8));
+			memmove(dst, src, tw * sizeof(uint16));
 			src += this->anim_buf_width;
 			dst += this->anim_buf_width;
 		}
@@ -407,7 +409,7 @@
 
 int Blitter_32bppAnim::BufferSize(int width, int height)
 {
-	return width * height * (sizeof(uint32) + sizeof(uint8));
+	return width * height * (sizeof(uint32) + sizeof(uint16));
 }
 
 void Blitter_32bppAnim::PaletteAnimate(const Palette &palette)
@@ -421,16 +423,19 @@
 		this->palette.count_dirty--;
 	}
 
-	const uint8 *anim = this->anim_buf;
+	this->palette.first_dirty = 1;
+	this->palette.count_dirty = 255;
+
+	const uint16 *anim = this->anim_buf;
 	uint32 *dst = (uint32 *)_screen.dst_ptr;
 
 	/* Let's walk the anim buffer and try to find the pixels */
 	for (int y = this->anim_buf_height; y != 0 ; y--) {
 		for (int x = this->anim_buf_width; x != 0 ; x--) {
-			uint colour = *anim;
+			uint colour = GB(*anim, 0, 8);
 			if (IsInsideBS(colour, this->palette.first_dirty, this->palette.count_dirty)) {
 				/* Update this pixel */
-				*dst = LookupColourInPalette(colour);
+				*dst = this->AdjustBrightness(LookupColourInPalette(colour), GB(*anim, 8, 8));
 			}
 			dst++;
 			anim++;
@@ -452,7 +457,7 @@
 	if (_screen.width != this->anim_buf_width || _screen.height != this->anim_buf_height) {
 		/* The size of the screen changed; we can assume we can wipe all data from our buffer */
 		free(this->anim_buf);
-		this->anim_buf = CallocT<uint8>(_screen.width * _screen.height);
+		this->anim_buf = CallocT<uint16>(_screen.width * _screen.height);
 		this->anim_buf_width = _screen.width;
 		this->anim_buf_height = _screen.height;
 	}
--- a/src/blitter/32bpp_anim.hpp
+++ b/src/blitter/32bpp_anim.hpp
@@ -17,7 +17,7 @@
 /** The optimised 32 bpp blitter with palette animation. */
 class Blitter_32bppAnim FINAL : public Blitter_32bppOptimized {
 private:
-	uint8 *anim_buf;     ///< In this buffer we keep track of the 8bpp indexes so we can do palette animation
+	uint16 *anim_buf;    ///< In this buffer we keep track of the 8bpp indexes so we can do palette animation
 	int anim_buf_width;  ///< The width of the animation buffer.
 	int anim_buf_height; ///< The height of the animation buffer.
 	Palette palette;     ///< The current palette.
--- a/src/blitter/32bpp_base.hpp
+++ b/src/blitter/32bpp_base.hpp
@@ -14,6 +14,7 @@
 
 #include "base.hpp"
 #include "../core/bitmath_func.hpp"
+#include "../core/math_func.hpp"
 #include "../gfx_func.h"
 
 /** Base for all 32bpp blitters. */
@@ -134,6 +135,33 @@
 
 		return ComposeColour(0xFF, colour, colour, colour);
 	}
+
+	static const int DEFAULT_BRIGHTNESS = 64;
+
+	static inline uint32 AdjustBrightness(uint32 colour, uint8 brightness)
+	{
+		/* Shortcut for normal brightness */
+		if (brightness == DEFAULT_BRIGHTNESS) return colour;
+
+		uint16 ob = 0;
+		uint16 r = GB(colour, 16, 8) * brightness / DEFAULT_BRIGHTNESS;
+		uint16 g = GB(colour, 8,  8) * brightness / DEFAULT_BRIGHTNESS;
+		uint16 b = GB(colour, 0,  8) * brightness / DEFAULT_BRIGHTNESS;
+
+		/* Sum overbright */
+		if (r > 255) ob += r - 255;
+		if (g > 255) ob += g - 255;
+		if (b > 255) ob += b - 255;
+
+		if (ob == 0) return ComposeColour(GB(colour, 24, 8), r, g, b);
+
+		/* Reduce overbright strength */
+		ob /= 2;
+		return ComposeColour(GB(colour, 24, 8),
+		                     r >= 255 ? 255 : min(r + ob * (255 - r) / 256, 255),
+		                     g >= 255 ? 255 : min(g + ob * (255 - g) / 256, 255),
+		                     b >= 255 ? 255 : min(b + ob * (255 - b) / 256, 255));
+	}
 };
 
 #endif /* BLITTER_32BPP_BASE_HPP */
--- a/src/blitter/32bpp_optimized.cpp
+++ b/src/blitter/32bpp_optimized.cpp
@@ -36,12 +36,12 @@
 	/* src_n  : each line begins with uint32 n = 'number of bytes in this line',
 	 *          then interleaved stream of 'm' and 'n' channels. 'm' is remap,
 	 *          'n' is number of bytes with the same alpha channel class */
-	const uint8  *src_n  = (const uint8  *)(src->data + src->offset[zoom][1]);
+	const uint16 *src_n  = (const uint16 *)(src->data + src->offset[zoom][1]);
 
 	/* skip upper lines in src_px and src_n */
 	for (uint i = bp->skip_top; i != 0; i--) {
 		src_px = (const Colour *)((const byte *)src_px + *(const uint32 *)src_px);
-		src_n += *(const uint32 *)src_n;
+		src_n = (const uint16 *)((const byte *)src_n + *(const uint32 *)src_n);
 	}
 
 	/* skip lines in dst */
@@ -59,8 +59,8 @@
 		src_px++;
 
 		/* next src_n line begins here */
-		const uint8 *src_n_ln = src_n + *(const uint32 *)src_n;
-		src_n += 4;
+		const uint16 *src_n_ln = (const uint16 *)((const byte *)src_n + *(const uint32 *)src_n);
+		src_n += 2;
 
 		/* we will end this line when we reach this point */
 		uint32 *dst_end = dst + bp->skip_left;
@@ -119,8 +119,8 @@
 							if (m == 0) {
 								*dst = src_px->data;
 							} else {
-								uint r = remap[m];
-								if (r != 0) *dst = this->LookupColourInPalette(r);
+								uint r = remap[GB(m, 0, 8)];
+								if (r != 0) *dst = this->AdjustBrightness(this->LookupColourInPalette(r), GB(m, 8, 8));
 							}
 							dst++;
 							src_px++;
@@ -132,8 +132,8 @@
 							if (m == 0) {
 								*dst = ComposeColourRGBANoCheck(src_px->r, src_px->g, src_px->b, src_px->a, *dst);
 							} else {
-								uint r = remap[m];
-								if (r != 0) *dst = ComposeColourPANoCheck(this->LookupColourInPalette(r), src_px->a, *dst);
+								uint r = remap[GB(m, 0, 8)];
+								if (r != 0) *dst = ComposeColourPANoCheck(this->AdjustBrightness(this->LookupColourInPalette(r), GB(m, 8, 8)), src_px->a, *dst);
 							}
 							dst++;
 							src_px++;
@@ -270,7 +270,7 @@
 	 *
 	 * it has to be stored in one stream so fewer registers are used -
 	 * x86 has problems with register allocation even with this solution */
-	uint8  *dst_n_orig[ZOOM_LVL_COUNT];
+	uint16 *dst_n_orig[ZOOM_LVL_COUNT];
 
 	/* lengths of streams */
 	uint32 lengths[ZOOM_LVL_COUNT][2];
@@ -293,7 +293,7 @@
 		uint size = src_orig->height * src_orig->width;
 
 		dst_px_orig[z] = CallocT<Colour>(size + src_orig->height * 2);
-		dst_n_orig[z]  = CallocT<uint8>(size * 2 + src_orig->height * 4 * 2);
+		dst_n_orig[z]  = CallocT<uint16>(size * 2 + src_orig->height * 4 * 2);
 
 		uint32 *dst_px_ln = (uint32 *)dst_px_orig[z];
 		uint32 *dst_n_ln  = (uint32 *)dst_n_orig[z];
@@ -302,9 +302,9 @@
 
 		for (uint y = src_orig->height; y > 0; y--) {
 			Colour *dst_px = (Colour *)(dst_px_ln + 1);
-			uint8 *dst_n = (uint8 *)(dst_n_ln + 1);
+			uint16 *dst_n = (uint16 *)(dst_n_ln + 1);
 
-			uint8 *dst_len = dst_n++;
+			uint16 *dst_len = dst_n++;
 
 			uint last = 3;
 			int len = 0;
@@ -313,7 +313,7 @@
 				uint8 a = src->a;
 				uint t = a > 0 && a < 255 ? 1 : a;
 
-				if (last != t || len == 255) {
+				if (last != t || len == 65535) {
 					if (last != 3) {
 						*dst_len = len;
 						dst_len = dst_n++;
@@ -328,8 +328,15 @@
 					dst_px->a = a;
 					*dst_n = src->m;
 					if (src->m != 0) {
+						/* Get brightest value */
+						uint8 rgb_max = max(src->r, max(src->g, src->b));
+
+						/* Black pixel (8bpp or old 32bpp image), so use default value */
+						if (rgb_max == 0) rgb_max = DEFAULT_BRIGHTNESS;
+						*dst_n |= rgb_max << 8;
+
 						/* Pre-convert the mapping channel to a RGB value */
-						uint32 colour = this->LookupColourInPalette(src->m);
+						uint32 colour = this->AdjustBrightness(this->LookupColourInPalette(src->m), rgb_max);
 						dst_px->r = GB(colour, 16, 8);
 						dst_px->g = GB(colour, 8,  8);
 						dst_px->b = GB(colour, 0,  8);
@@ -354,7 +361,7 @@
 			}
 
 			dst_px = (Colour *)AlignPtr(dst_px, 4);
-			dst_n  = (uint8 *)AlignPtr(dst_n, 4);
+			dst_n  = (uint16 *)AlignPtr(dst_n, 4);
 
 			*dst_px_ln = (uint8 *)dst_px - (uint8 *)dst_px_ln;
 			*dst_n_ln  = (uint8 *)dst_n  - (uint8 *)dst_n_ln;
--- a/src/blitter/32bpp_simple.cpp
+++ b/src/blitter/32bpp_simple.cpp
@@ -20,11 +20,11 @@
 
 void Blitter_32bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
 {
-	const SpriteLoader::CommonPixel *src, *src_line;
+	const Blitter_32bppSimple::Pixel *src, *src_line;
 	uint32 *dst, *dst_line;
 
 	/* Find where to start reading in the source sprite */
-	src_line = (const SpriteLoader::CommonPixel *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);
+	src_line = (const Blitter_32bppSimple::Pixel *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);
 	dst_line = (uint32 *)bp->dst + bp->top * bp->pitch + bp->left;
 
 	for (int y = 0; y < bp->height; y++) {
@@ -41,7 +41,7 @@
 					if (src->m == 0) {
 						if (src->a != 0) *dst = ComposeColourRGBA(src->r, src->g, src->b, src->a, *dst);
 					} else {
-						if (bp->remap[src->m] != 0) *dst = ComposeColourPA(this->LookupColourInPalette(bp->remap[src->m]), src->a, *dst);
+						if (bp->remap[src->m] != 0) *dst = ComposeColourPA(this->AdjustBrightness(this->LookupColourInPalette(bp->remap[src->m]), src->v), src->a, *dst);
 					}
 					break;
 
@@ -94,26 +94,42 @@
 
 Sprite *Blitter_32bppSimple::Encode(SpriteLoader::Sprite *sprite, AllocatorProc *allocator)
 {
-	Sprite *dest_sprite;
-	SpriteLoader::CommonPixel *dst;
-	dest_sprite = (Sprite *)allocator(sizeof(*dest_sprite) + sprite->height * sprite->width * sizeof(SpriteLoader::CommonPixel));
+	Blitter_32bppSimple::Pixel *dst;
+	Sprite *dest_sprite = (Sprite *)allocator(sizeof(*dest_sprite) + sprite->height * sprite->width * sizeof(*dst));
 
 	dest_sprite->height = sprite->height;
 	dest_sprite->width  = sprite->width;
 	dest_sprite->x_offs = sprite->x_offs;
 	dest_sprite->y_offs = sprite->y_offs;
 
-	dst = (SpriteLoader::CommonPixel *)dest_sprite->data;
+	dst = (Blitter_32bppSimple::Pixel *)dest_sprite->data;
+	SpriteLoader::CommonPixel *src = (SpriteLoader::CommonPixel *)sprite->data;
 
-	memcpy(dst, sprite->data, sprite->height * sprite->width * sizeof(SpriteLoader::CommonPixel));
 	for (int i = 0; i < sprite->height * sprite->width; i++) {
-		if (dst[i].m != 0) {
+		if (src->m == 0) {
+			dst[i].r = src->r;
+			dst[i].g = src->g;
+			dst[i].b = src->b;
+			dst[i].a = src->a;
+			dst[i].m = 0;
+			dst[i].v = 0;
+		} else {
+			/* Get brightest value */
+			uint8 rgb_max = max(src->r, max(src->g, src->b));
+
+			/* Black pixel (8bpp or old 32bpp image), so use default value */
+			if (rgb_max == 0) rgb_max = DEFAULT_BRIGHTNESS;
+			dst[i].v = rgb_max;
+
 			/* Pre-convert the mapping channel to a RGB value */
-			uint colour = this->LookupColourInPalette(dst[i].m);
+			uint colour = this->AdjustBrightness(this->LookupColourInPalette(src[i].m), dst[i].v);
 			dst[i].r = GB(colour, 16, 8);
 			dst[i].g = GB(colour, 8,  8);
 			dst[i].b = GB(colour, 0,  8);
+			dst[i].a = src->a;
+			dst[i].m = src->m;
 		}
+		src++;
 	}
 
 	return dest_sprite;
--- a/src/blitter/32bpp_simple.hpp
+++ b/src/blitter/32bpp_simple.hpp
@@ -17,6 +17,14 @@
 
 /** The most trivial 32 bpp blitter (without palette animation). */
 class Blitter_32bppSimple : public Blitter_32bppBase {
+	struct Pixel {
+		uint8 r;  ///< Red-channel
+		uint8 g;  ///< Green-channel
+		uint8 b;  ///< Blue-channel
+		uint8 a;  ///< Alpha-channel
+		uint8 m;  ///< Remap-channel
+		uint8 v;  ///< Brightness-channel
+	};
 public:
 	/* virtual */ void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom);
 	/* virtual */ void DrawColourMappingRect(void *dst, int width, int height, PaletteID pal);
--- a/src/spriteloader/png.cpp
+++ b/src/spriteloader/png.cpp
@@ -186,9 +186,6 @@
 		for (uint x = 0; x < png_get_image_width(png_ptr, info_ptr); x++) {
 			if (mask) {
 				if (row_pointer[x * sizeof(uint8)] != 0) {
-					dst[x].r = 0;
-					dst[x].g = 0;
-					dst[x].b = 0;
 					/* Alpha channel is used from the original image (to allow transparency in remap colours) */
 					extern const byte _palmap_w2d[];
 					byte colour = row_pointer[x * sizeof(uint8)];