File indexing completed on 2025-04-20 05:11:11

 //
 // C++ Interface: canvas_private
 //
 // Description:
 //
 //
 // Author: Alan Grimes <agrimes@speakeasy.net>, (C) 2008
 //
 // Copyright: See COPYING file that comes with this distribution
 //
 //
 
 #ifndef CANVAS_PRIVATE_H
 #define CANVAS_PRIVATE_H
 
 #include "canvasitems.h"
 #include "ktlq3polygonscanner.h"
 #include <QBitmap>
 #include <QImage>
 
 class KtlQPolygonalProcessor
 {
 public:
     KtlQPolygonalProcessor(KtlQCanvas *c, const QPolygon &pa)
         : canvas(c)
     {
         QRect pixelbounds = pa.boundingRect();
         bounds.setLeft(canvas->toChunkScaling(pixelbounds.left()));
         bounds.setRight(canvas->toChunkScaling(pixelbounds.right()));
         bounds.setTop(canvas->toChunkScaling(pixelbounds.top()));
         bounds.setBottom(canvas->toChunkScaling(pixelbounds.bottom()));
         // bitmap = QImage(bounds.width(),bounds.height(),1,2,QImage::LittleEndian); // 2018.09.07 - convert to non-deprecated
         bitmap = QImage(bounds.width(), bounds.height(), QImage::Format_MonoLSB);
         pnt = 0;
         bitmap.fill(0);
     }
 
     inline void add(int x, int y)
     {
         if (pnt >= result.size()) {
             result.resize(pnt * 2 + 10);
         }
         result[pnt++] = QPoint(x + bounds.x(), y + bounds.y());
     }
 
     inline void addBits(int x1, int x2, uchar newbits, int xo, int yo)
     {
         for (int i = x1; i <= x2; i++)
             if (newbits & (1 << i))
                 add(xo + i, yo);
     }
 
     void doSpans(int n, QPoint *pt, int *w)
     {
         for (int j = 0; j < n; j++) {
             int y = canvas->toChunkScaling(pt[j].y()) - bounds.y();
             uchar *l = bitmap.scanLine(y);
             int x = pt[j].x();
             int x1 = canvas->toChunkScaling(x) - bounds.x();
             int x2 = canvas->toChunkScaling(x + w[j]) - bounds.x();
             int x1q = x1 / 8;
             int x1r = x1 % 8;
             int x2q = x2 / 8;
             int x2r = x2 % 8;
             if (x1q == x2q) {
                 uchar newbits = (~l[x1q]) & (((2 << (x2r - x1r)) - 1) << x1r);
                 if (newbits) {
                     addBits(x1r, x2r, newbits, x1q * 8, y);
                     l[x1q] |= newbits;
                 }
             } else {
                 uchar newbits1 = (~l[x1q]) & (0xff << x1r);
                 if (newbits1) {
                     addBits(x1r, 7, newbits1, x1q * 8, y);
                     l[x1q] |= newbits1;
                 }
                 for (int i = x1q + 1; i < x2q; i++) {
                     if (l[i] != 0xff) {
                         addBits(0, 7, ~l[i], i * 8, y);
                         l[i] = 0xff;
                     }
                 }
                 uchar newbits2 = (~l[x2q]) & (0xff >> (7 - x2r));
                 if (newbits2) {
                     addBits(0, x2r, newbits2, x2q * 8, y);
                     l[x2q] |= newbits2;
                 }
             }
         }
         result.resize(pnt);
     }
 
     QPolygon result;
 
 private:
     int pnt;
 
     KtlQCanvas *canvas;
     QRect bounds;
     QImage bitmap;
 };
 
 class KtlQCanvasViewData
 {
 public:
     KtlQCanvasViewData()
         : repaint_from_moving(false)
     {
     }
     QTransform xform;
     QTransform ixform;
     bool repaint_from_moving;
 };
 
 class KtlQCanvasClusterizer
 {
 public:
     KtlQCanvasClusterizer(int maxclusters);
     ~KtlQCanvasClusterizer();
 
     void add(int x, int y); // 1x1 rectangle (point)
     void add(int x, int y, int w, int h);
     void add(const QRect &rect);
 
     void clear();
     int clusters()
     {
         return count;
     }
     const QRect &operator[](int i);
 
 private:
     QRect *cluster;
     int count;
     const int maxcl;
 };
 
 class KtlQCanvasItemPtr
 {
 public:
     KtlQCanvasItemPtr()
         : ptr(nullptr)
     {
     }
     KtlQCanvasItemPtr(KtlQCanvasItem *p)
         : ptr(p)
     {
     }
 
     bool operator<=(const KtlQCanvasItemPtr &that) const
     {
         // Order same-z objects by identity.
         if (that.ptr->z() == ptr->z())
             return that.ptr <= ptr;
         return that.ptr->z() <= ptr->z();
     }
 
     bool operator<(const KtlQCanvasItemPtr &that) const
     {
         // Order same-z objects by identity.
         if (that.ptr->z() == ptr->z())
             return that.ptr < ptr;
         return that.ptr->z() < ptr->z();
     }
 
     bool operator>(const KtlQCanvasItemPtr &that) const
     {
         // Order same-z objects by identity.
         if (that.ptr->z() == ptr->z())
             return that.ptr > ptr;
         return that.ptr->z() > ptr->z();
     }
 
     bool operator==(const KtlQCanvasItemPtr &that) const
     {
         return that.ptr == ptr;
     }
 
     operator KtlQCanvasItem *() const
     {
         return ptr;
     }
 
 private:
     KtlQCanvasItem *ptr;
 };
 
 class KtlQCanvasChunk
 {
 public:
     KtlQCanvasChunk()
         : changed(true)
     {
     }
     // Other code assumes lists are not deleted. Assignment is also
     // done on ChunkRecs. So don't add that sort of thing here.
 
     void sort()
     {
         list.sort();
     }
 
     const KtlQCanvasItemList *listPtr() const
     {
         return &list;
     }
 
     void add(KtlQCanvasItem *item)
     {
         list.prepend(item);
         changed = true;
     }
 
     void remove(KtlQCanvasItem *item)
     {
         list.removeAll(item);
         changed = true;
     }
 
     void change()
     {
         changed = true;
     }
 
     bool hasChanged() const
     {
         return changed;
     }
 
     bool takeChange()
     {
         bool y = changed;
         changed = false;
         return y;
     }
 
 private:
     KtlQCanvasItemList list;
     bool changed;
 };
 
 class KtlQCanvasPolygonScanner : public KtlQ3PolygonScanner
 {
     KtlQPolygonalProcessor &processor;
 
 public:
     KtlQCanvasPolygonScanner(KtlQPolygonalProcessor &p)
         : processor(p)
     {
     }
     void processSpans(int n, QPoint *point, int *width) override
     {
         processor.doSpans(n, point, width);
     }
 };
 
 // lesser-used data in canvas item, plus room for extension.
 // Be careful adding to this - check all usages.
 class KtlQCanvasItemExtra
 {
     KtlQCanvasItemExtra() /* : vx(0.0), vy(0.0) */
     {
     }
     // double vx,vy; // 2017.10.01 - commented unused members
     friend class KtlQCanvasItem;
 };
 
 #endif