grab from latest android

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

1 files changed, 157 insertions, 0 deletions

diff --git a/samplecode/SampleShaders.cpp b/samplecode/SampleShaders.cpp
new file mode 100644
index 0000000000..4d82182846
--- /dev/null
+++ b/samplecode/SampleShaders.cpp
@@ -0,0 +1,157 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkGradientShader.h"
+#include "SkGraphics.h"
+#include "SkImageDecoder.h"
+#include "SkPath.h"
+#include "SkPorterDuff.h"
+#include "SkRegion.h"
+#include "SkShader.h"
+#include "SkUtils.h"
+#include "SkXfermode.h"
+#include "SkShaderExtras.h"
+#include "SkColorPriv.h"
+#include "SkColorFilter.h"
+#include "SkTime.h"
+#include "SkTransparentShader.h"
+#include "SkTypeface.h"
+
+static SkShader* make_bitmapfade(const SkBitmap& bm)
+{
+    SkPoint pts[2];
+    SkColor colors[2];
+
+    pts[0].set(0, 0);
+    pts[1].set(0, SkIntToScalar(bm.height()));
+    colors[0] = SK_ColorBLACK;
+    colors[1] = SkColorSetARGB(0, 0, 0, 0);
+    SkShader* shaderA = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode);
+
+    SkShader* shaderB = SkShader::CreateBitmapShader(bm,
+                        SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
+
+    SkXfermode* mode = SkPorterDuff::CreateXfermode(SkPorterDuff::kDstIn_Mode);
+
+    SkShader* shader = new SkComposeShader(shaderB, shaderA, mode);
+    shaderA->unref();
+    shaderB->unref();
+    mode->unref();
+    
+    return shader;
+}
+
+class ShaderView : public SkView {
+public:
+    SkShader*   fShader;
+    SkBitmap    fBitmap;
+
+	ShaderView()
+    {
+        SkImageDecoder::DecodeFile("/cover.png", &fBitmap);
+
+        SkPoint pts[2];
+        SkColor colors[2];
+        
+        pts[0].set(0, 0);
+        pts[1].set(SkIntToScalar(100), 0);
+        colors[0] = SK_ColorRED;
+        colors[1] = SK_ColorBLUE;
+        SkShader* shaderA = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode);
+        
+        pts[0].set(0, 0);
+        pts[1].set(0, SkIntToScalar(100));
+        colors[0] = SK_ColorBLACK;
+        colors[1] = SkColorSetARGB(0x80, 0, 0, 0);
+        SkShader* shaderB = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode);
+        
+        SkXfermode* mode = SkPorterDuff::CreateXfermode(SkPorterDuff::kDstIn_Mode);
+
+        fShader = new SkComposeShader(shaderA, shaderB, mode);
+        shaderA->unref();
+        shaderB->unref();
+        mode->unref();
+    }
+    virtual ~ShaderView()
+    {
+        fShader->safeUnref();
+    }
+    
+protected:
+    // overrides from SkEventSink
+    virtual bool onQuery(SkEvent* evt)
+    {
+            if (SampleCode::TitleQ(*evt))
+            {
+                SampleCode::TitleR(evt, "Shaders");
+                return true;
+            }
+            return this->INHERITED::onQuery(evt);
+    }
+    
+    void drawBG(SkCanvas* canvas)
+    {
+//        canvas->drawColor(0xFFDDDDDD);
+        canvas->drawColor(SK_ColorWHITE);
+    }
+    
+    virtual void onDraw(SkCanvas* canvas)
+    {
+        this->drawBG(canvas);
+        
+        canvas->drawBitmap(fBitmap, 0, 0);
+        
+        {
+            SkIRect src;
+            SkRect  dst;
+            
+            src.set(20, 50, 120, 70);
+            dst.set(src);
+            dst.offset(SkIntToScalar(300), 0);
+
+            canvas->drawBitmapRect(fBitmap, &src, dst);
+        }
+
+        canvas->translate(SkIntToScalar(80), SkIntToScalar(80));
+        
+        SkPaint paint;
+        SkRect  r;
+
+        paint.setColor(SK_ColorGREEN);
+        canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint);
+        paint.setShader(fShader);
+        canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint);
+
+        canvas->translate(SkIntToScalar(110), 0);
+
+        r.set(0, 0, SkIntToScalar(fBitmap.width()), SkIntToScalar(fBitmap.height()));
+
+        paint.setShader(NULL);
+        canvas->drawRect(r, paint);
+        paint.setShader(make_bitmapfade(fBitmap))->unref();
+        canvas->drawRect(r, paint);
+        
+        paint.setShader(new SkTransparentShader)->unref();
+        canvas->drawRect(r, paint);
+    }
+    
+    virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) 
+    {
+        this->inval(NULL);
+        return this->INHERITED::onFindClickHandler(x, y);
+    }
+    
+    virtual bool onClick(Click* click) 
+    {
+        return this->INHERITED::onClick(click);
+    }
+    
+private:
+    typedef SkView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new ShaderView; }
+static SkViewRegister reg(MyFactory);
+