add sample for mipmaps
git-svn-id: http://skia.googlecode.com/svn/trunk@218 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleMipMap.cpp b/samplecode/SampleMipMap.cpp
new file mode 100644
index 0000000..025cb07
--- /dev/null
+++ b/samplecode/SampleMipMap.cpp
@@ -0,0 +1,136 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkDevice.h"
+#include "SkPaint.h"
+
+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));
+ SkPaint paint;
+ paint.setAntiAlias(true);
+
+ paint.setColor(SK_ColorRED);
+ canvas.drawOval(r, paint);
+ paint.setColor(SK_ColorBLUE);
+ paint.setStrokeWidth(SkIntToScalar(n)/15);
+ paint.setStyle(SkPaint::kStroke_Style);
+ canvas.drawLine(0, 0, r.fRight, r.fBottom, paint);
+ canvas.drawLine(0, r.fBottom, r.fRight, 0, paint);
+
+ return bitmap;
+}
+
+class MipMapView : public SkView {
+ SkBitmap fBitmap;
+ enum {
+ N = 128
+ };
+public:
+ MipMapView() {
+ fBitmap = createBitmap(N);
+
+ fWidth = N;
+ fDW = -1;
+ }
+
+protected:
+ // overrides from SkEventSink
+ virtual bool onQuery(SkEvent* evt) {
+ if (SampleCode::TitleQ(*evt)) {
+ SampleCode::TitleR(evt, "MapMaps");
+ return true;
+ }
+ return this->INHERITED::onQuery(evt);
+ }
+
+ void drawN(SkCanvas* canvas, const SkBitmap& bitmap) {
+ SkAutoCanvasRestore acr(canvas, true);
+ for (int i = N; i > 1; i >>= 1) {
+ canvas->drawBitmap(bitmap, 0, 0, NULL);
+ canvas->translate(SkIntToScalar(N + 8), 0);
+ canvas->scale(SK_ScalarHalf, SK_ScalarHalf);
+ }
+ }
+
+ void drawN2(SkCanvas* canvas, const SkBitmap& bitmap) {
+ SkBitmap bg;
+ bg.setConfig(SkBitmap::kARGB_8888_Config, N, N);
+ bg.allocPixels();
+
+ SkAutoCanvasRestore acr(canvas, true);
+ for (int i = 0; i < N-2; i++) {
+ bg.eraseColor(0);
+ SkCanvas c(bg);
+ c.scale(SK_Scalar1 / (1 << i), SK_Scalar1 / (1 << i));
+ c.drawBitmap(bitmap, 0, 0, NULL);
+
+ canvas->save();
+ canvas->scale(SkIntToScalar(1 << i), SkIntToScalar(1 << i));
+ canvas->drawBitmap(bg, 0, 0, NULL);
+ canvas->restore();
+ canvas->translate(SkIntToScalar(N + 8), 0);
+ }
+ }
+
+ void drawBG(SkCanvas* canvas) {
+ canvas->drawColor(SK_ColorWHITE);
+ }
+
+ virtual void onDraw(SkCanvas* canvas) {
+ this->drawBG(canvas);
+
+ canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
+
+ drawN2(canvas, fBitmap);
+
+ canvas->translate(0, SkIntToScalar(N + 8));
+ SkBitmap bitmap(fBitmap);
+ bitmap.buildMipMap();
+ drawN2(canvas, bitmap);
+
+ fWidth += fDW;
+ if (fDW > 0 && fWidth > N) {
+ fDW = -fDW;
+ fWidth = N;
+ } else if (fDW < 0 && fWidth < 8) {
+ fDW = -fDW;
+ fWidth = 8;
+ }
+
+ SkRect dst;
+ dst.set(0, 0, SkIntToScalar(fWidth), SkIntToScalar(fWidth));
+
+ SkPaint paint;
+ paint.setFilterBitmap(true);
+ paint.setAntiAlias(true);
+
+ canvas->translate(0, SkIntToScalar(N + 8));
+ canvas->drawBitmapRect(fBitmap, NULL, dst, NULL);
+ canvas->translate(SkIntToScalar(N + 8), 0);
+ canvas->drawBitmapRect(fBitmap, NULL, dst, &paint);
+ canvas->translate(SkIntToScalar(N + 8), 0);
+ canvas->drawBitmapRect(bitmap, NULL, dst, NULL);
+ canvas->translate(SkIntToScalar(N + 8), 0);
+ canvas->drawBitmapRect(bitmap, NULL, dst, &paint);
+
+ this->inval(NULL);
+ }
+
+private:
+ int fWidth, fDW;
+
+ typedef SkView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new MipMapView; }
+static SkViewRegister reg(MyFactory);
+