add debugging code for degenerate gradients (to be removed later)

git-svn-id: http://skia.googlecode.com/svn/trunk@1805 2bbb7eff-a529-9590-31e7-b0007b416f81

samplecode/SampleXfermodesBlur.cpp

@@ -24,6 +24,40 @@
 #include "SkImageDecoder.h"
 #include "SkBlurMaskFilter.h"
 
+static void test_gradient2(SkCanvas* canvas) {
+/*
+    ctx.fillStyle = '#f00';
+    ctx.fillRect(0, 0, 100, 50);
+    
+    var g = ctx.createRadialGradient(-80, 25, 70, 0, 25, 150);
+    g.addColorStop(0, '#f00');
+    g.addColorStop(0.01, '#0f0');
+    g.addColorStop(0.99, '#0f0');
+    g.addColorStop(1, '#f00');
+    ctx.fillStyle = g;
+    ctx.fillRect(0, 0, 100, 50);
+*/
+    SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorGREEN, SK_ColorRED };
+    SkScalar pos[] = { 0, SkFloatToScalar(0.01f), SkFloatToScalar(0.99f), SK_Scalar1 };
+    SkPoint c0 = { -80, 25 };
+    SkScalar r0 = 70;
+    SkPoint c1 = { 0, 25 };
+    SkScalar r1 = 150;
+    SkShader* s = SkGradientShader::CreateTwoPointRadial(c0, r0, c1, r1, colors,
+                                                         pos, SK_ARRAY_COUNT(pos),
+                                                         SkShader::kClamp_TileMode);
+
+    SkPaint paint;
+    paint.setShader(s)->unref();
+
+    canvas->drawPaint(paint);
+
+    paint.setShader(NULL);
+    paint.setStyle(SkPaint::kStroke_Style);
+    SkRect r = { 0, 0, 100, 50 };
+    canvas->drawRect(r, paint);
+}
+
 static void setNamedTypeface(SkPaint* paint, const char name[]) {
     SkTypeface* face = SkTypeface::CreateFromName(name, SkTypeface::kNormal);
     paint->setTypeface(face);
@@ -86,6 +120,10 @@ protected:
     }
 
     virtual void onDrawContent(SkCanvas* canvas) {
+        if (false) {
+            test_gradient2(canvas);
+            return;
+        }
         canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
 
         const struct {