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git-svn-id: http://skia.googlecode.com/svn/trunk@1260 2bbb7eff-a529-9590-31e7-b0007b416f81

samplecode/SampleColorFilter.cpp

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+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkColorFilter.h"
+#include "SkDevice.h"
+#include "SkPaint.h"
+#include "SkShader.h"
+
+static SkShader* createChecker() {
+    SkBitmap bm;
+    bm.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
+    bm.allocPixels();
+    bm.lockPixels();
+    *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = SkPreMultiplyColor(0xFFFFFFFF);
+    *bm.getAddr32(0, 1) = *bm.getAddr32(1, 0) = SkPreMultiplyColor(0xFFCCCCCC);
+    SkShader* s = SkShader::CreateBitmapShader(bm, SkShader::kRepeat_TileMode,
+                                               SkShader::kRepeat_TileMode);
+
+    SkMatrix m;
+    m.setScale(12, 12);
+    s->setLocalMatrix(m);
+    return s;
+}
+
+static SkBitmap createBitmap(int n) {
+    SkBitmap bitmap;
+    bitmap.setConfig(SkBitmap::kARGB_8888_Config, n, n);
+    bitmap.allocPixels();
+    bitmap.eraseColor(0);
+    
+    SkCanvas canvas(bitmap);
+    SkRect r;
+    r.set(0, 0, SkIntToScalar(n), SkIntToScalar(n));
+    r.inset(SK_Scalar1, SK_Scalar1);
+
+    SkPaint paint;
+    paint.setAntiAlias(true);
+    
+    paint.setColor(SK_ColorRED);
+    canvas.drawOval(r, paint);
+
+    r.inset(SK_Scalar1*n/4, SK_Scalar1*n/4);
+    paint.setXfermodeMode(SkXfermode::kSrc_Mode);
+    paint.setColor(0x800000FF);
+    canvas.drawOval(r, paint);
+    
+    return bitmap;
+}
+
+class ColorFilterView : public SampleView {
+    SkBitmap fBitmap;
+    SkShader* fShader;
+    enum {
+        N = 64
+    };
+public:
+    ColorFilterView() {
+        fBitmap = createBitmap(N);
+        fShader = createChecker();
+    }
+
+    virtual ~ColorFilterView() {
+        fShader->unref();
+    }
+
+protected:
+    // overrides from SkEventSink
+    virtual bool onQuery(SkEvent* evt) {
+        if (SampleCode::TitleQ(*evt)) {
+            SampleCode::TitleR(evt, "ColorFilter");
+            return true;
+        }
+        return this->INHERITED::onQuery(evt);
+    }
+
+    virtual void onDrawBackground(SkCanvas* canvas) {
+        SkPaint paint;
+        paint.setShader(fShader);
+        canvas->drawPaint(paint);
+    }
+
+    virtual void onDrawContent(SkCanvas* canvas) {
+        if (false) {
+            SkPaint p;
+            p.setAntiAlias(true);
+            SkRect r = { 20.4f, 10, 20.6f, 20 };
+            canvas->drawRect(r, p);
+            r.set(30.9f, 10, 31.1f, 20);
+            canvas->drawRect(r, p);
+            return;
+        }
+        
+        static const SkXfermode::Mode gModes[] = {
+            SkXfermode::kSrc_Mode,
+            SkXfermode::kDst_Mode,
+            SkXfermode::kSrcIn_Mode,
+            SkXfermode::kDstIn_Mode,
+            SkXfermode::kSrcOut_Mode,
+            SkXfermode::kDstOut_Mode,
+            SkXfermode::kSrcATop_Mode,
+            SkXfermode::kDstATop_Mode,
+        };
+    
+        static const SkColor gColors[] = {
+            0xFF000000,
+            0x80000000,
+            0xFF00FF00,
+            0x8000FF00,
+            0x00000000,
+        };
+
+        float scale = 1.5f;
+        SkPaint paint;
+        canvas->translate(N / 8, N / 8);
+
+        for (size_t y = 0; y < SK_ARRAY_COUNT(gColors); y++) {
+            for (size_t x = 0; x < SK_ARRAY_COUNT(gModes); x++) {
+                SkColorFilter* cf = SkColorFilter::CreateModeFilter(gColors[y], gModes[x]);
+                SkSafeUnref(paint.setColorFilter(cf));
+                canvas->drawBitmap(fBitmap, x * N * 1.25f, y * N * scale, &paint);
+            }
+        }
+        
+    }
+    
+private:
+    typedef SampleView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new ColorFilterView; }
+static SkViewRegister reg(MyFactory);
+