5fd9243fd6
git-svn-id: http://skia.googlecode.com/svn/trunk@1249 2bbb7eff-a529-9590-31e7-b0007b416f81
144 lines
4.3 KiB
C++
144 lines
4.3 KiB
C++
#include "SampleCode.h"
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#include "SkView.h"
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#include "SkCanvas.h"
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#include "SkDevice.h"
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#include "SkPaint.h"
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#include "SkShader.h"
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static SkBitmap createBitmap(int n) {
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SkBitmap bitmap;
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bitmap.setConfig(SkBitmap::kARGB_8888_Config, n, n);
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bitmap.allocPixels();
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bitmap.eraseColor(0);
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SkCanvas canvas(bitmap);
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SkRect r;
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r.set(0, 0, SkIntToScalar(n), SkIntToScalar(n));
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setColor(SK_ColorRED);
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canvas.drawOval(r, paint);
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paint.setColor(SK_ColorBLUE);
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paint.setStrokeWidth(SkIntToScalar(n)/15);
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paint.setStyle(SkPaint::kStroke_Style);
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canvas.drawLine(0, 0, r.fRight, r.fBottom, paint);
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canvas.drawLine(0, r.fBottom, r.fRight, 0, paint);
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return bitmap;
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}
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class MipMapView : public SampleView {
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SkBitmap fBitmap;
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enum {
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N = 64
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};
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public:
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MipMapView() {
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fBitmap = createBitmap(N);
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fWidth = N;
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}
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protected:
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// overrides from SkEventSink
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virtual bool onQuery(SkEvent* evt) {
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if (SampleCode::TitleQ(*evt)) {
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SampleCode::TitleR(evt, "MipMaps");
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return true;
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}
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return this->INHERITED::onQuery(evt);
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}
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void drawN(SkCanvas* canvas, const SkBitmap& bitmap) {
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SkAutoCanvasRestore acr(canvas, true);
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for (int i = N; i > 1; i >>= 1) {
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canvas->drawBitmap(bitmap, 0, 0, NULL);
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canvas->translate(SkIntToScalar(N + 8), 0);
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canvas->scale(SK_ScalarHalf, SK_ScalarHalf);
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}
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}
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void drawN2(SkCanvas* canvas, const SkBitmap& bitmap) {
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SkBitmap bg;
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bg.setConfig(SkBitmap::kARGB_8888_Config, N, N);
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bg.allocPixels();
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SkAutoCanvasRestore acr(canvas, true);
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for (int i = 0; i < 6; i++) {
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bg.eraseColor(0);
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SkCanvas c(bg);
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c.scale(SK_Scalar1 / (1 << i), SK_Scalar1 / (1 << i));
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c.drawBitmap(bitmap, 0, 0, NULL);
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canvas->save();
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canvas->scale(SkIntToScalar(1 << i), SkIntToScalar(1 << i));
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canvas->drawBitmap(bg, 0, 0, NULL);
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canvas->restore();
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canvas->translate(SkIntToScalar(N + 8), 0);
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}
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}
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virtual void onDrawContent(SkCanvas* canvas) {
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canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
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canvas->scale(1.00000001f, 0.9999999f);
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drawN2(canvas, fBitmap);
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canvas->translate(0, SkIntToScalar(N + 8));
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SkBitmap bitmap(fBitmap);
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bitmap.buildMipMap();
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drawN2(canvas, bitmap);
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SkScalar time = SampleCode::GetAnimScalar(SkIntToScalar(1)/4,
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SkIntToScalar(2));
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if (time >= SK_Scalar1) {
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time = SkIntToScalar(2) - time;
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}
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fWidth = 8 + SkScalarRound(N * time);
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SkRect dst;
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dst.set(0, 0, SkIntToScalar(fWidth), SkIntToScalar(fWidth));
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SkPaint paint;
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paint.setFilterBitmap(true);
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paint.setAntiAlias(true);
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canvas->translate(0, SkIntToScalar(N + 8));
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canvas->drawBitmapRect(fBitmap, NULL, dst, NULL);
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canvas->translate(SkIntToScalar(N + 8), 0);
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canvas->drawBitmapRect(fBitmap, NULL, dst, &paint);
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canvas->translate(-SkIntToScalar(N + 8), SkIntToScalar(N + 8));
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canvas->drawBitmapRect(bitmap, NULL, dst, NULL);
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canvas->translate(SkIntToScalar(N + 8), 0);
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canvas->drawBitmapRect(bitmap, NULL, dst, &paint);
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SkShader* s = SkShader::CreateBitmapShader(bitmap,
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SkShader::kRepeat_TileMode,
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SkShader::kRepeat_TileMode);
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paint.setShader(s)->unref();
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SkMatrix m;
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m.setScale(SkIntToScalar(fWidth) / N,
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SkIntToScalar(fWidth) / N);
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s->setLocalMatrix(m);
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SkRect r;
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r.set(0, 0, SkIntToScalar(4*N), SkIntToScalar(5*N/2));
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r.offset(SkIntToScalar(N + 12), -SkIntToScalar(N + 4));
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canvas->drawRect(r, paint);
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this->inval(NULL);
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}
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private:
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int fWidth;
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typedef SampleView INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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static SkView* MyFactory() { return new MipMapView; }
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static SkViewRegister reg(MyFactory);
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