grab from latest android

git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 147 insertions, 0 deletions

diff --git a/samplecode/SampleLines.cpp b/samplecode/SampleLines.cpp
new file mode 100644
index 0000000000..eed0e5a2cf
--- /dev/null
+++ b/samplecode/SampleLines.cpp
@@ -0,0 +1,147 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "Sk64.h"
+#include "SkCornerPathEffect.h"
+#include "SkGradientShader.h"
+#include "SkGraphics.h"
+#include "SkImageDecoder.h"
+#include "SkKernel33MaskFilter.h"
+#include "SkPath.h"
+#include "SkRandom.h"
+#include "SkRegion.h"
+#include "SkShader.h"
+#include "SkUtils.h"
+#include "SkShaderExtras.h"
+#include "SkColorPriv.h"
+#include "SkColorFilter.h"
+#include "SkTime.h"
+#include "SkTypeface.h"
+#include "SkXfermode.h"
+
+#include "SkStream.h"
+#include "SkXMLParser.h"
+#include "SkColorPriv.h"
+#include "SkImageDecoder.h"
+
+class LinesView : public SkView {
+public:
+	LinesView()
+    {
+        unsigned r = 0x1F;
+        unsigned g = 0x3F;
+        for (unsigned a = 0; a <= 0xF; a++) {
+            unsigned scale = 16 - SkAlpha15To16(a);
+            unsigned sr = (a << 1) | (a >> 3);
+            unsigned dr = r * scale >> 4;
+            unsigned sg = (a << 2) | (a >> 2);
+            unsigned dg = g * scale >> 4;
+            
+            unsigned ssg = sg & ~(~(a >> 3) & 1);
+            
+            printf("4444 sa=%d sr=%d sg=%d da=%d dr=%d dg=%d total-r=%d total-g=%d %d\n",
+                   a, sr, sg, scale, dr, dg, sr+dr, sg+dg, ssg+dg);
+        }
+        
+        for (unsigned aa = 0; aa <= 0xFF; aa++) {
+            unsigned invScale = SkAlpha255To256(255 - aa);
+            unsigned dst = SkAlphaMul(0xFF, invScale);
+            printf("8888 sa=%02x dst=%02x sum=%d %s\n", aa, dst, aa+dst,
+                   (aa+dst) > 0xFF ? "OVERFLOW" : "");
+        }
+    }
+    
+protected:
+    // overrides from SkEventSink
+    virtual bool onQuery(SkEvent* evt)
+    {
+        if (SampleCode::TitleQ(*evt))
+        {
+            SampleCode::TitleR(evt, "Lines");
+            return true;
+        }
+        return this->INHERITED::onQuery(evt);
+    }
+
+    void drawBG(SkCanvas* canvas)
+    {
+//        canvas->drawColor(0xFFDDDDDD);
+        canvas->drawColor(SK_ColorWHITE);
+   //     canvas->drawColor(SK_ColorBLACK);
+    }
+    
+    /*
+     0x1F * x + 0x1F * (32 - x)
+     */
+    void drawRings(SkCanvas* canvas)
+    {
+        canvas->scale(SkIntToScalar(1)/2, SkIntToScalar(1)/2);
+        
+        SkRect  r;        
+        SkScalar x = SkIntToScalar(10);
+        SkScalar y = SkIntToScalar(10);
+        r.set(x, y, x + SkIntToScalar(100), y + SkIntToScalar(100));
+        
+        SkPaint paint;
+        paint.setAntiAlias(true);
+        paint.setStyle(SkPaint::kStroke_Style);
+        paint.setStrokeWidth(SkScalarHalf(SkIntToScalar(3)));
+        paint.setColor(0xFFFF8800);
+        paint.setColor(0xFFFFFFFF);
+        canvas->drawRect(r, paint);
+    }
+    
+    virtual void onDraw(SkCanvas* canvas)
+    {
+        this->drawBG(canvas);
+        
+        SkBitmap bm;
+        SkImageDecoder::DecodeFile("/kill.gif", &bm);
+        canvas->drawBitmap(bm, 0, 0, NULL);
+        
+        this->drawRings(canvas);
+        return;
+
+        SkPaint paint;
+        
+      //  fAlpha = 0x80;
+        paint.setColor(SK_ColorWHITE);
+        paint.setAlpha(fAlpha & 0xFF);
+        SkRect r;
+        
+        SkScalar x = SkIntToScalar(10);
+        SkScalar y = SkIntToScalar(10);
+        r.set(x, y, x + SkIntToScalar(100), y + SkIntToScalar(100));
+        canvas->drawRect(r, paint);
+        return;
+        
+        paint.setColor(0xffffff00);            // yellow
+        paint.setStyle(SkPaint::kStroke_Style);
+        paint.setStrokeWidth(SkIntToScalar(2));
+        
+//        y += SK_Scalar1/2;
+
+        canvas->drawLine(x, y, x + SkIntToScalar(90), y + SkIntToScalar(90), paint);
+
+        paint.setAntiAlias(true);              // with anti-aliasing
+        y += SkIntToScalar(10);
+        canvas->drawLine(x, y, x + SkIntToScalar(90), y + SkIntToScalar(90), paint);
+    }
+
+    virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) 
+    {
+        fAlpha = SkScalarRound(y);
+        this->inval(NULL);
+        return NULL;
+    }
+private:
+
+    int fAlpha;
+    typedef SkView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new LinesView; }
+static SkViewRegister reg(MyFactory);
+