fix winding bug in lineclipper

expose path.dump() all the time
UP arrow now toggles a grid of clip rects in sample app



git-svn-id: http://skia.googlecode.com/svn/trunk@443 2bbb7eff-a529-9590-31e7-b0007b416f81

include/core/SkPath.h

@@ -547,11 +547,8 @@ public:
         Verb autoClose(SkPoint pts[2]);
     };
 
-#ifdef SK_DEBUG
-  /** @cond UNIT_TEST */
     void dump(bool forceClose, const char title[] = NULL) const;
-  /** @endcond */
+    void dump() const;
-#endif
 
     void flatten(SkFlattenableWriteBuffer&) const;
     void unflatten(SkFlattenableReadBuffer&);

include/views/SkView.h

@@ -96,7 +96,8 @@ public:
     void        offset(SkScalar dx, SkScalar dy);
 
     /** Call this to have the view draw into the specified canvas. */
-    void        draw(SkCanvas* canvas);
+    virtual void draw(SkCanvas* canvas);
+
     /** Call this to invalidate part of all of a view, requesting that the view's
         draw method be called. The rectangle parameter specifies the part of the view
         that should be redrawn. If it is null, it specifies the entire view bounds.

samplecode/SampleApp.cpp

@@ -129,6 +129,8 @@ public:
 	SampleWindow(void* hwnd);
 	virtual ~SampleWindow();
 
+    virtual void draw(SkCanvas* canvas);
+
 protected:
     virtual void onDraw(SkCanvas* canvas);
 	virtual bool onHandleKey(SkKey key);
@@ -167,6 +169,7 @@ private:
     CanvasType fCanvasType;
 
     bool fUseClip;
+    bool fNClip;
     bool fRepeatDrawing;
     bool fAnimating;
     bool fRotate;
@@ -210,6 +213,7 @@ SampleWindow::SampleWindow(void* hwnd) : INHERITED(hwnd) {
 
     fCanvasType = kRaster_CanvasType;
     fUseClip = false;
+    fNClip = false;
     fRepeatDrawing = false;
     fAnimating = false;
     fRotate = false;
@@ -237,6 +241,33 @@ SampleWindow::~SampleWindow() {
     delete fGLCanvas;
 }
 
+#define XCLIP_N  4
+#define YCLIP_N  1
+
+void SampleWindow::draw(SkCanvas* canvas) {
+    if (fNClip) {
+     //   this->INHERITED::draw(canvas);
+     //   SkBitmap orig = capture_bitmap(canvas);
+
+        const SkScalar w = this->width();
+        const SkScalar h = this->height();
+        const SkScalar cw = w / XCLIP_N;
+        const SkScalar ch = h / YCLIP_N;
+        for (int y = 0; y < YCLIP_N; y++) {
+            for (int x = 0; x < XCLIP_N; x++) {
+                SkAutoCanvasRestore acr(canvas, true);
+                SkRect r = {
+                    x * cw, y * ch, (x + 1) * cw, (y + 1) * ch
+                };
+                canvas->clipRect(r);
+                this->INHERITED::draw(canvas);
+            }
+        }
+    } else {
+        this->INHERITED::draw(canvas);
+    }
+}
+
 void SampleWindow::onDraw(SkCanvas* canvas) {
     if (fRepeatDrawing) {
         this->inval(NULL);
@@ -511,7 +542,7 @@ bool SampleWindow::onHandleKey(SkKey key) {
             this->inval(NULL);
             return true;
         case kUp_SkKey:
-            fUseClip = !fUseClip;
+            fNClip = !fNClip;
             this->updateTitle();
             this->inval(NULL);
             return true;
@@ -604,7 +635,9 @@ void SampleWindow::updateTitle() {
     if (fRotate) {
         title.prepend("<R> ");
     }
-    
+    if (fNClip) {
+        title.prepend("<C> ");
+    }
     this->setTitle(title.c_str());
 }
 

src/core/SkLineClipper.cpp

@@ -124,21 +124,26 @@ int SkLineClipper::ClipLine(const SkPoint pts[], const SkRect& clip,
     SkPoint resultStorage[kMaxPoints];
     SkPoint* result;    // points to our results, either tmp or resultStorage
     int lineCount = 1;
+    bool reverse;
 
     if (pts[0].fX < pts[1].fX) {
         index0 = 0;
         index1 = 1;
+        reverse = false;
     } else {
         index0 = 1;
         index1 = 0;
+        reverse = true;
     }
-    
+
     if (tmp[index1].fX <= clip.fLeft) {  // wholly to the left
         tmp[0].fX = tmp[1].fX = clip.fLeft;
         result = tmp;
+        reverse = false;
     } else if (tmp[index0].fX >= clip.fRight) {    // wholly to the right
         tmp[0].fX = tmp[1].fX = clip.fRight;
         result = tmp;
+        reverse = false;
     } else {
         result = resultStorage;
         SkPoint* r = result;
@@ -164,7 +169,7 @@ int SkLineClipper::ClipLine(const SkPoint pts[], const SkRect& clip,
     }
 
     // Now copy the results into the caller's lines[] parameter
-    if (0 == index1) {
+    if (reverse) {
         // copy the pts in reverse order to maintain winding order
         for (int i = 0; i <= lineCount; i++) {
             lines[lineCount - i] = result[i];

src/core/SkPath.cpp

@@ -1222,30 +1222,6 @@ void SkPath::unflatten(SkFlattenableReadBuffer& buffer) {
 ///////////////////////////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////////////////////////
 
-#ifdef SK_DEBUG
-
-void SkPath::validate() const {
-    SkASSERT(this != NULL);
-    SkASSERT((fFillType & ~3) == 0);
-    fPts.validate();
-    fVerbs.validate();
-
-    if (!fBoundsIsDirty) {
-        SkRect bounds;
-        compute_pt_bounds(&bounds, fPts);
-        if (fPts.count() <= 1) {
-            // if we're empty, fBounds may be empty but translated, so we can't
-            // necessarily compare to bounds directly
-            // try path.addOval(2, 2, 2, 2) which is empty, but the bounds will
-            // be [2, 2, 2, 2]
-            SkASSERT(bounds.isEmpty());
-            SkASSERT(fBounds.isEmpty());
-        } else {
-            fBounds.contains(bounds);
-        }
-    }
-}
-
 void SkPath::dump(bool forceClose, const char title[]) const {
     Iter    iter(*this, forceClose);
     SkPoint pts[4];
@@ -1306,4 +1282,31 @@ void SkPath::dump(bool forceClose, const char title[]) const {
     SkDebugf("path: done %s\n", title ? title : "");
 }
 
+void SkPath::dump() const {
+    this->dump(false);
+}
+
+#ifdef SK_DEBUG
+void SkPath::validate() const {
+    SkASSERT(this != NULL);
+    SkASSERT((fFillType & ~3) == 0);
+    fPts.validate();
+    fVerbs.validate();
+    
+    if (!fBoundsIsDirty) {
+        SkRect bounds;
+        compute_pt_bounds(&bounds, fPts);
+        if (fPts.count() <= 1) {
+            // if we're empty, fBounds may be empty but translated, so we can't
+            // necessarily compare to bounds directly
+            // try path.addOval(2, 2, 2, 2) which is empty, but the bounds will
+            // be [2, 2, 2, 2]
+            SkASSERT(bounds.isEmpty());
+            SkASSERT(fBounds.isEmpty());
+        } else {
+            fBounds.contains(bounds);
+        }
+    }
+}
 #endif
+