support both box and circle lcd

samplecode/SampleApp.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SampleApp.h"
 
 #include "OverView.h"
@@ skipping 1103 matching lines @@
     path.reset(); path.addArc(r, 240, 120); path.lineTo(cx, cy);
     canvas->drawPath(path, set_color_ref(paint, SkColorSetRGB(0, 0, SkColorGetB(c))));
 }
 
 typedef void (*ShowLCDProc)(SkCanvas*, SkScalar, SkScalar, SkColor, SkScalar, SkScalar);
 
 /*
  *  Like drawBitmapRect but we manually draw each pixels in RGB
  */
 static void show_lcd_grid(SkCanvas* canvas, const SkBitmap& bitmap,
-                          const SkIRect& origSrc, const SkRect& dst) {
+                          const SkIRect& origSrc, const SkRect& dst, ShowLCDProc proc) {
     SkIRect src;
     if (!src.intersect(origSrc, bitmap.bounds())) {
         return;
     }
     const SkScalar sx = dst.width() / src.width();
     const SkScalar sy = dst.height() / src.height();
 
     SkAutoCanvasRestore acr(canvas, true);
     canvas->translate(dst.left(), dst.top());
     canvas->scale(sx, sy);
 
-    ShowLCDProc proc = show_lcd_box;
-    if (true) {
-        proc = show_lcd_circle;
-    }
-
     for (int y = 0; y < src.height(); ++y) {
         for (int x = 0; x < src.width(); ++x) {
             proc(canvas, SkIntToScalar(x), SkIntToScalar(y),
                  bitmap.getColor(src.left() + x, src.top() + y), sx, sy);
         }
     }
 }
 
 void SampleWindow::showZoomer(SkCanvas* canvas) {
     int count = canvas->save();
@@ skipping 15 matching lines @@
     SkIRect src;
     src.set(0, 0, zoomedWidth / fFatBitsScale, zoomedHeight / fFatBitsScale);
     src.offset(fMouseX - (src.width()>>1), fMouseY - (src.height()>>1));
     SkRect dest;
     dest.set(0, 0, SkIntToScalar(zoomedWidth), SkIntToScalar(zoomedHeight));
     dest.offset(SkIntToScalar(width - zoomedWidth), SkIntToScalar(height - zoomedHeight));
     SkPaint paint;
     // Clear the background behind our zoomed in view
     paint.setColor(SK_ColorWHITE);
     canvas->drawRect(dest, paint);
-    if (fFatBitsScale < kMaxFatBitsScale) {
-        canvas->drawBitmapRect(bitmap, src, dest, NULL);
-    } else {
-        show_lcd_grid(canvas, bitmap, src, dest);
+    switch (fFatBitsScale) {
+        case kMaxFatBitsScale:
+            show_lcd_grid(canvas, bitmap, src, dest, show_lcd_box);
+            break;
+        case kMaxFatBitsScale - 1:
+            show_lcd_grid(canvas, bitmap, src, dest, show_lcd_circle);
+            break;
+        default:
+            canvas->drawBitmapRect(bitmap, src, dest, NULL);
+            break;
     }
 
     paint.setColor(SK_ColorBLACK);
     paint.setStyle(SkPaint::kStroke_Style);
     // Draw a border around the pixel in the middle
     SkRect originalPixel;
     originalPixel.set(SkIntToScalar(fMouseX), SkIntToScalar(fMouseY), SkIntToScalar(fMouseX + 1), SkIntToScalar(fMouseY + 1));
     SkMatrix matrix;
     SkRect scalarSrc;
     scalarSrc.set(src);
@@ skipping 1186 matching lines @@
     setenv("ANDROID_ROOT", "/android/device/data", 0);
 #endif
     SkGraphics::Init();
     SkEvent::Init();
 }
 
 void application_term() {
     SkEvent::Term();
     SkGraphics::Term();
 }