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99 lines
2.2 KiB
99 lines
2.2 KiB
#include <string.h>
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template<class Pixel>
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struct Bitmap {
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int width, height, extra;
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Pixel *data;
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Bitmap(int e=0) : extra(e), data(0) { };
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~Bitmap() { delete[] data; };
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void size(int w,int h) {
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delete[] data;
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width = w;
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height = h;
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data = new Pixel[w*h+extra];
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clear();
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}
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void clear() {
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memset(data,0,sizeof(Pixel)*(width*height+extra));
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}
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};
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template<class Pixel, class Combiner, int superSampleShift>
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struct PolygonEngine : public Bitmap<Pixel> {
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PolygonEngine() : Bitmap<Pixel>(1) { }
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#define super (1<<superSampleShift)
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void apply(Pixel *dest) {
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Pixel sum=0;
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int count = this->width*this->height;
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Pixel *src = this->data;
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while(count--) {
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sum += *(src++);
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if (sum)
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*dest = Combiner::combine(sum,*dest);
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dest++;
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}
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}
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void add(Pixel color,int x,int y) {
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if (y < 0) return;
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if (y >= this->height) return;
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if (x < 0) x = 0;
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if (x > this->width) x = this->width;
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this->data[x+y*this->width] += color;
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}
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/* Color is char[layers] */
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// zwoosh, yknow, it goes... zwoosh an all these bars and lines and
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// crap intersect.
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Pixel colorTable[2][super+1];
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void pen(Pixel color) {
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for(int i=0;i<super+1;i++) {
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colorTable[0][i] = color*i;
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colorTable[1][i] = -(color*i);
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}
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}
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void line(int x1,int y1,int x2,int y2) {
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Pixel *colors;
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if (y2 < y1) {
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int temp;
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temp = x2; x2 = x1; x1 = temp;
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temp = y2; y2 = y1; y1 = temp;
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colors = colorTable[1];
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} else {
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if (y1 == y2) return;
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colors= colorTable[0];
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}
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int slope = (x1-x2 << 16)/(y1-y2);
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int x = x1<<16, y = y1;
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while(y < y2) {
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add(colors[super-((x>>16)&(super-1))],
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x>>(16+superSampleShift),y>>superSampleShift);
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add(colors[(x>>16)&(super-1)],
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1+(x>>(16+superSampleShift)),y>>superSampleShift);
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x += slope;
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y++;
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}
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}
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void icon(double icon[][4],Pixel color,double x,double y,
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double scaleX, double scaleY) {
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pen(color);
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x *= super;
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y *= super;
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scaleX *= super;
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scaleY *= super;
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for(int i=0;icon[i][1] != icon[i][3];i++)
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line(int(icon[i][0]*scaleX+x),int(icon[i][1]*scaleY+y),
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int(icon[i][2]*scaleX+x),int(icon[i][3]*scaleY+y));
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}
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#undef super
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};
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