grab from latest android

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

1 files changed, 123 insertions, 0 deletions

diff --git a/samplecode/SampleTextAlpha.cpp b/samplecode/SampleTextAlpha.cpp
new file mode 100644
index 0000000000..f2a653064b
--- /dev/null
+++ b/samplecode/SampleTextAlpha.cpp
@@ -0,0 +1,123 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkBlurMaskFilter.h"
+#include "SkCanvas.h"
+#include "SkGradientShader.h"
+#include "SkGraphics.h"
+#include "SkImageDecoder.h"
+#include "SkPath.h"
+#include "SkPorterDuff.h"
+#include "SkRandom.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 "SkTypeface.h"
+
+#include "SkImageRef.h"
+#include "SkOSFile.h"
+#include "SkStream.h"
+
+static void check_for_nonwhite(const SkBitmap& bm, int alpha) {
+    if (bm.config() != SkBitmap::kRGB_565_Config) {
+        return;
+    }
+    
+    for (int y = 0; y < bm.height(); y++) {
+        for (int x = 0; x < bm.width(); x++) {
+            uint16_t c = *bm.getAddr16(x, y);
+            if (c != 0xFFFF) {
+                SkDebugf("------ nonwhite alpha=%x [%d %d] %x\n", alpha, x, y, c);
+                return;
+            }
+        }
+    }
+}
+
+class TextAlphaView : public SkView {
+public:    
+	TextAlphaView() {
+        fByte = 0xFF;
+    }
+    
+protected:
+    // overrides from SkEventSink
+    virtual bool onQuery(SkEvent* evt)  {
+        if (SampleCode::TitleQ(*evt)) {
+            SkString str("TextAlpha");
+            SampleCode::TitleR(evt, str.c_str());
+            return true;
+        }
+        return this->INHERITED::onQuery(evt);
+    }
+    
+    void drawBG(SkCanvas* canvas) {
+        canvas->drawColor(SK_ColorWHITE);
+    }
+    
+    virtual void onDraw(SkCanvas* canvas) {
+        this->drawBG(canvas);
+        
+        const char* str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+        SkPaint paint;
+        SkScalar    x = SkIntToScalar(10);
+        SkScalar    y = SkIntToScalar(20);
+        
+        paint.setFlags(0x105);
+        
+        paint.setARGB(fByte, 0xFF, 0xFF, 0xFF);
+        
+        paint.setMaskFilter(SkBlurMaskFilter::Create(SkIntToScalar(3),
+                                        SkBlurMaskFilter::kNormal_BlurStyle));
+        paint.getMaskFilter()->unref();
+        
+        SkRandom rand;
+        
+        for (int ps = 6; ps <= 35; ps++) {
+            paint.setColor(rand.nextU() | (0xFF << 24));
+            paint.setTextSize(SkIntToScalar(ps));
+            paint.setTextSize(SkIntToScalar(24));
+            canvas->drawText(str, strlen(str), x, y, paint);
+            y += paint.getFontMetrics(NULL);
+        }
+        //check_for_nonwhite(canvas->getDevice()->accessBitmap(), fByte);
+        //SkDebugf("------ byte %x\n", fByte);
+
+        if (false) {
+            fByte += 1;
+            fByte &= 0xFF;
+            this->inval(NULL);
+        }
+    }
+    
+    virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
+        return new Click(this);
+    }
+    
+    virtual bool onClick(Click* click) {
+        int y = click->fICurr.fY;
+        if (y < 0) {
+            y = 0;
+        } else if (y > 255) {
+            y = 255;
+        }
+        fByte = y;
+        this->inval(NULL);
+        return true;
+    }
+    
+private:
+    int fByte;
+
+    typedef SkView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new TextAlphaView; }
+static SkViewRegister reg(MyFactory);
+