Add alpha transparency ability for blocks

PixelAttributes.h

@@ -11,11 +11,13 @@
 #define PIXELATTRIBUTES_H_ADZ35GYF
 
 #include <limits>
+#include <stdint.h>
 #include "config.h"
 
 struct PixelAttribute {
-	PixelAttribute(): height(std::numeric_limits<int>::min()) {};
+	PixelAttribute(): height(std::numeric_limits<int>::min()), thicken(0) {};
 	int height;
+	uint8_t thicken;
 	inline bool valid_height() {
 		return height != std::numeric_limits<int>::min();
 	}

README.rst

@@ -53,6 +53,9 @@ drawplayers:
 draworigin:
     Draw origin indicator, `--draworigin`
 
+drawalpha:
+    Allow blocks to be drawn with transparency, `--drawalpha`
+
 noshading:
     Don't draw shading on nodes, `--noshading`
 

TileGenerator.cpp

@@ -54,9 +54,14 @@ static inline uint16_t readU16(const unsigned char *data)
 	return data[0] << 8 | data[1];
 }
 
-static inline int rgb2int(uint8_t r, uint8_t g, uint8_t b)
+static inline int rgb2int(uint8_t r, uint8_t g, uint8_t b, uint8_t a=0xFF)
 {
-	return (r << 16) + (g << 8) + b;
+	return (a << 24) + (r << 16) + (g << 8) + b;
+}
+
+static inline int color2int(Color c)
+{
+    return rgb2int(c.r, c.g, c.b, c.a);
 }
 
 static inline int readBlockContent(const unsigned char *mapData, int version, int datapos)
@@ -93,6 +98,19 @@ static inline int colorSafeBounds(int color)
 	}
 }
 
+static inline Color mixColors(Color a, Color b)
+{
+    Color result;
+    double a1 = a.a / 255.0;
+    double a2 = b.a / 255.0;
+
+    result.r = (int) (a1 * a.r + a2 * (1 - a1) * b.r);
+    result.g = (int) (a1 * a.g + a2 * (1 - a1) * b.g);
+    result.b = (int) (a1 * a.b + a2 * (1 - a1) * b.b);
+    result.a = (int) (255 * (a1 + a2 * (1 - a1)));
+    return result;
+}
+
 TileGenerator::TileGenerator():
 	m_bgColor(255, 255, 255),
 	m_scaleColor(0, 0, 0),
@@ -101,6 +119,7 @@ TileGenerator::TileGenerator():
 	m_drawOrigin(false),
 	m_drawPlayers(false),
 	m_drawScale(false),
+	m_drawAlpha(false),
 	m_shading(true),
 	m_border(0),
 	m_backend("sqlite3"),
@@ -178,6 +197,11 @@ void TileGenerator::setDrawScale(bool drawScale)
 	}
 }
 
+void TileGenerator::setDrawAlpha(bool drawAlpha)
+{
+    m_drawAlpha = drawAlpha;
+}
+
 void TileGenerator::setShading(bool shading)
 {
 	m_shading = shading;
@@ -268,7 +292,7 @@ void TileGenerator::parseColorsStream(std::istream &in)
 {
 	while (in.good()) {
 		string name;
-		Color color;
+		ColorEntry color;
 		in >> name;
 		if (name[0] == '#') {
 			in.ignore(65536, '\n');
@@ -277,14 +301,20 @@ void TileGenerator::parseColorsStream(std::istream &in)
 		while (name == "\n" && in.good()) {
 			in >> name;
 		}
-		int r, g, b;
+		int r, g, b, a, t;
 		in >> r;
 		in >> g;
 		in >> b;
+		if(in.peek() != '\n') {
+		    in >> a;
+		    if(in.peek() != '\n')
+                in >> t;
+            else
+                t = 0;
+		} else
+		    a = 0xFF;
 		if (in.good()) {
-			color.r = r;
+			color = ColorEntry(r,g,b,a,t);
-			color.g = g;
-			color.b = b;
 			m_colors[name] = color;
 		}
 	}
@@ -352,7 +382,7 @@ void TileGenerator::createImage()
 	m_image = gdImageCreateTrueColor(m_mapWidth + m_border, m_mapHeight + m_border);
 	m_blockPixelAttributes.setWidth(m_mapWidth);
 	// Background
-	gdImageFilledRectangle(m_image, 0, 0, m_mapWidth + m_border - 1, m_mapHeight + m_border -1, rgb2int(m_bgColor.r, m_bgColor.g, m_bgColor.b));
+	gdImageFilledRectangle(m_image, 0, 0, m_mapWidth + m_border - 1, m_mapHeight + m_border -1, color2int(m_bgColor));
 }
 
 std::map<int, TileGenerator::BlockList> TileGenerator::getBlocksOnZ(int zPos)
@@ -496,6 +526,8 @@ inline void TileGenerator::renderMapBlock(const unsigned_string &mapBlock, const
 	const unsigned char *mapData = mapBlock.c_str();
 	int minY = (pos.y * 16 > m_yMin) ? 0 : m_yMin - pos.y * 16;
 	int maxY = (pos.y * 16 < m_yMax) ? 15 : m_yMax - pos.y * 16;
+	Color col;
+	uint8_t th;
 	for (int z = 0; z < 16; ++z) {
 		int imageY = getImageY(zBegin + 15 - z);
 		for (int x = 0; x < 16; ++x) {
@@ -503,6 +535,10 @@ inline void TileGenerator::renderMapBlock(const unsigned_string &mapBlock, const
 				continue;
 			}
 			int imageX = getImageX(xBegin + x);
+			if(m_drawAlpha) {
+			    col = Color(0,0,0,0);
+			    th = 0;
+			}
 
 			for (int y = maxY; y >= minY; --y) {
 				int position = x + (y << 4) + (z << 8);
@@ -511,12 +547,26 @@ inline void TileGenerator::renderMapBlock(const unsigned_string &mapBlock, const
 					continue;
 				}
 				std::map<int, std::string>::iterator blockName = m_nameMap.find(content);
-				if (blockName != m_nameMap.end()) {
+				if (blockName == m_nameMap.end())
+				    continue;
 				const string &name = blockName->second;
 				ColorMap::const_iterator color = m_colors.find(name);
 				if (color != m_colors.end()) {
-						const Color &c = color->second;
+					const Color c = color->second.to_color();
-						m_image->tpixels[imageY][imageX] = rgb2int(c.r, c.g, c.b);
+					if (m_drawAlpha) {
+					    if (col.a == 0)
+					        col = c;
+					    else
+					        col = mixColors(col, c);
+					    if(col.a == 0xFF) {
+					        m_image->tpixels[imageY][imageX] = color2int(col);
+					        m_blockPixelAttributes.attribute(15 - z, xBegin + x).thicken = th;
+					    } else {
+					        th = (th + color->second.t) / 2.0;
+					        continue;
+					    }
+					} else
+					    m_image->tpixels[imageY][imageX] = color2int(c);
 					m_readedPixels[z] |= (1 << x);
 					m_blockPixelAttributes.attribute(15 - z, xBegin + x).height = pos.y * 16 + y;
 				} else {
@@ -528,7 +578,6 @@ inline void TileGenerator::renderMapBlock(const unsigned_string &mapBlock, const
 		}
 	}
 }
-}
 
 inline void TileGenerator::renderShading(int zPos)
 {
@@ -550,13 +599,16 @@ inline void TileGenerator::renderShading(int zPos)
 			if (d > 36) {
 				d = 36;
 			}
+			if (m_drawAlpha)
+			    d = d * ((0xFF - m_blockPixelAttributes.attribute(z, x).thicken) / 255.0);
 			int sourceColor = m_image->tpixels[imageY][getImageX(x)] & 0xffffff;
-			int r = (sourceColor & 0xff0000) >> 16;
+			uint8_t r = (sourceColor & 0xff0000) >> 16;
-			int g = (sourceColor & 0x00ff00) >> 8;
+			uint8_t g = (sourceColor & 0x00ff00) >> 8;
-			int b = (sourceColor & 0x0000ff);
+			uint8_t b = (sourceColor & 0x0000ff);
 			r = colorSafeBounds(r + d);
 			g = colorSafeBounds(g + d);
 			b = colorSafeBounds(b + d);
+
 			m_image->tpixels[imageY][getImageX(x)] = rgb2int(r, g, b);
 		}
 	}
@@ -565,7 +617,7 @@ inline void TileGenerator::renderShading(int zPos)
 
 void TileGenerator::renderScale()
 {
-	int color = rgb2int(m_scaleColor.r, m_scaleColor.g, m_scaleColor.b);
+	int color = color2int(m_scaleColor);
 	gdImageString(m_image, gdFontGetMediumBold(), 24, 0, reinterpret_cast<unsigned char *>(const_cast<char *>("X")), color);
 	gdImageString(m_image, gdFontGetMediumBold(), 2, 24, reinterpret_cast<unsigned char *>(const_cast<char *>("Z")), color);
 
@@ -596,12 +648,12 @@ void TileGenerator::renderOrigin()
 {
 	int imageX = -m_xMin * 16 + m_border;
 	int imageY = m_mapHeight - m_zMin * -16 + m_border;
-	gdImageArc(m_image, imageX, imageY, 12, 12, 0, 360, rgb2int(m_originColor.r, m_originColor.g, m_originColor.b));
+	gdImageArc(m_image, imageX, imageY, 12, 12, 0, 360, color2int(m_originColor));
 }
 
 void TileGenerator::renderPlayers(const std::string &inputPath)
 {
-	int color = rgb2int(m_playerColor.r, m_playerColor.g, m_playerColor.b);
+	int color = color2int(m_playerColor);
 
 	PlayerAttributes players(inputPath);
 	for (PlayerAttributes::Players::iterator player = players.begin(); player != players.end(); ++player) {

TileGenerator.h

@@ -21,13 +21,27 @@
 #include "db.h"
 
 struct Color {
-	Color(): r(255), g(255), b(255) {};
+	Color(): r(0xFF), g(0xFF), b(0xFF), a(0) {};
-	Color(uint8_t r, uint8_t g, uint8_t b): r(r), g(g), b(b) {};
+	Color(uint8_t r, uint8_t g, uint8_t b): r(r), g(g), b(b), a(0xFF) {};
+	Color(uint8_t r, uint8_t g, uint8_t b, uint8_t a): r(r), g(g), b(b), a(a) {};
 	uint8_t r;
 	uint8_t g;
 	uint8_t b;
+	uint8_t a;
 };
 
+struct ColorEntry {
+    ColorEntry(): r(0), g(0), b(0), a(0), t(0) {};
+	ColorEntry(uint8_t r, uint8_t g, uint8_t b, uint8_t a, uint8_t t): r(r), g(g), b(b), a(a), t(t) {};
+	inline Color to_color() const { return Color(r, g, b, a); }
+	uint8_t r;
+	uint8_t g;
+	uint8_t b;
+	uint8_t a;
+	uint8_t t;
+};
+
+
 struct BlockPos {
 	int x;
 	int y;
@@ -61,7 +75,7 @@ class TileGenerator
 {
 private:
 	typedef std::basic_string<unsigned char> unsigned_string;
-	typedef std::map<std::string, Color> ColorMap;
+	typedef std::map<std::string, ColorEntry> ColorMap;
 	typedef std::pair<BlockPos, unsigned_string> Block;
 	typedef std::list<Block> BlockList;
 
@@ -75,6 +89,7 @@ public:
 	void setDrawOrigin(bool drawOrigin);
 	void setDrawPlayers(bool drawPlayers);
 	void setDrawScale(bool drawScale);
+	void setDrawAlpha(bool drawAlpha);
 	void setShading(bool shading);
 	void setGeometry(int x, int y, int w, int h);
 	void setMinY(int y);
@@ -110,6 +125,7 @@ private:
 	bool m_drawOrigin;
 	bool m_drawPlayers;
 	bool m_drawScale;
+	bool m_drawAlpha;
 	bool m_shading;
 	int m_border;
 	std::string m_backend;

autogenerating-colors.txt

@@ -90,8 +90,9 @@ while read -r p; do
 	fi
 done < nodes.txt > colors.txt
 # Use nicer colors for water and lava
-sed -re 's/^default:water_([a-z]+) [0-9 ]+$/default:water_\1 39 66 106/' < colors.txt > tmp$$ && mv tmp$$ colors.txt
+sed -re 's/^default:water_([a-z]+) [0-9 ]+$/default:water_\1 39 66 106 128 224/' < colors.txt > tmp$$ && mv tmp$$ colors.txt
 sed -re 's/^default:lava_([a-z]+) [0-9 ]+$/default:lava_\1 255 100 0/' < colors.txt > tmp$$ && mv tmp$$ colors.txt
+sed -re 's/^default:([a-z_]*)glass ([0-9 ]+)$/default:\1glass \2 64 16/' < colors.txt > tmp$$ && mv tmp$$ colors.txt
 ==INSTRUCTIONS==
 1) Make sure avgcolors.py outputs the usage instructions
 2) Add the dumpnodes mod to Minetest

colors.txt

@@ -1466,15 +1466,15 @@ mesecons_lightstone:lightstone_yellow_off 222 220 72
 mesecons_walllever:wall_lever_on 136 136 136
 mesecons_walllever:wall_lever_off 136 136 136
 bones:bones 74 74 74
-default:glass 192 192 227
+default:glass 192 192 227 64 16
-default:water_flowing 39 66 106
+default:water_flowing 39 66 106 128 224
 default:junglesapling 37 34 14
 default:sandstonebrick 160 144 108
 default:furnace_active 97 93 91
 default:sign_wall 163 141 106
 default:lava_source 255 100 0
 default:goldblock 126 116 35
-default:obsidian_glass 16 17 17
+default:obsidian_glass 16 17 17 64 16
 default:stone_with_copper 91 88 87
 default:grass_1 72 109 32
 default:papyrus 98 173 32
@@ -1505,7 +1505,7 @@ default:desert_stone 122 74 57
 default:tree 66 52 35
 default:jungletree 120 106 78
 default:cactus 132 143 108
-default:water_source 39 66 106
+default:water_source 39 66 106 128 224
 default:mese 200 202 0
 default:stone_with_coal 91 88 87
 default:nyancat 38 16 66

mapper.cpp

@@ -30,6 +30,7 @@ void usage()
 			"  --drawscale\n"
 			"  --drawplayers\n"
 			"  --draworigin\n"
+			"  --drawalpha\n"
 			"  --noshading\n"
 			"  --min-y <y>\n"
 			"  --max-y <y>\n"
@@ -53,6 +54,7 @@ int main(int argc, char *argv[])
 		{"draworigin", no_argument, 0, 'R'},
 		{"drawplayers", no_argument, 0, 'P'},
 		{"drawscale", no_argument, 0, 'S'},
+		{"drawalpha", no_argument, 0, 'e'},
 		{"noshading", no_argument, 0, 'H'},
 		{"geometry", required_argument, 0, 'g'},
 		{"min-y", required_argument, 0, 'a'},
@@ -108,6 +110,9 @@ int main(int argc, char *argv[])
 			case 'S':
 				generator.setDrawScale(true);
 				break;
+			case 'e':
+			    generator.setDrawAlpha(true);
+			    break;
 			case 'H':
 				generator.setShading(false);
 				break;