image.d

image.d

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+module arsd.image;
+
+/**
+	This provides two image classes and a bunch of functions that work on them.
+
+	Why are they separate classes? I think the operations on the two of them
+	are necessarily different. There's a whole bunch of operations that only
+	really work on truecolor (blurs, gradients), and a few that only work
+	on indexed images (palette swaps).
+
+	Even putpixel is pretty different. On indexed, it is a palette entry's
+	index number. On truecolor, it is the actual color.
+
+	A greyscale image is the weird thing in the middle. It is truecolor, but
+	fits in the same size as indexed. Still, I'd say it is a specialization
+	of truecolor.
+
+	There is a subset that works on both
+
+*/
+
+struct Color {
+	ubyte r;
+	ubyte g;
+	ubyte b;
+	ubyte a = 255;
+}
+
+interface Image {
+
+}
+
+class IndexedImage : Image {
+	bool hasAlpha;
+	Color[] palette;
+	ubyte[] data;
+
+	int width;
+	int height;
+
+	this(int w, int h) {
+		width = w;
+		height = h;
+		data = new ubyte[w*h];
+	}
+
+	void resize(int w, int h, bool scale) {
+
+	}
+/+
+	TrueColorImage convertToTrueColor() const {
+
+	}
++/
+	ubyte getOrAddColor(Color c) {
+		foreach(i, co; palette) {
+			if(c == co)
+				return cast(ubyte) i;
+		}
+
+		return addColor(c);
+	}
+
+	int numColors() const {
+		return palette.length;
+	}
+
+	ubyte addColor(Color c) {
+		assert(palette.length < 256);
+		if(c.a != 255)
+			hasAlpha = true;
+		palette ~= c;
+
+		return cast(ubyte) (palette.length - 1);
+	}
+}
+
+class TrueColorImage : Image {
+//	bool hasAlpha;
+//	bool isGreyscale;
+	ubyte[] data; // stored as rgba quads, upper left to right to bottom
+
+	int width;
+	int height;
+
+	this(int w, int h) {
+		width = w;
+		height = h;
+		data = new ubyte[w*h*4];
+	}
+
+/+
+	IndexedImage convertToIndexedImage(int maxColors = 256) {
+
+	}
++/
+}
+
+/**
+	Operations take a mask, which tells them where to apply.
+
+	ImageMask.All means to just apply it
+
+*/
+
+/+
+struct ImageMask {
+	int width;
+	int height;
+	int left;
+	int top;
+	enum Shape { Rect, Custom }
+
+	// Fills in each line, from the far left most set bit to the far right.
+	// So you can take an outline, do filled and affect it all
+	ImageMask filled() {
+
+	}
+}
++/
+//TrueColorImage gradient