skia2/samplecode/SampleMipMap.cpp
reed@android.com 83f7bc30af remove conditional build flag for mipmaps
remove obsolete SkBitmapShader.cpp file



git-svn-id: http://skia.googlecode.com/svn/trunk@271 2bbb7eff-a529-9590-31e7-b0007b416f81
2009-07-17 02:42:41 +00:00

153 lines
4.4 KiB
C++

#include "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkDevice.h"
#include "SkPaint.h"
#include "SkShader.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 = 90
};
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 < 6; 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));
canvas->scale(1.00000001, 0.9999999);
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), SkIntToScalar(N + 8));
canvas->drawBitmapRect(bitmap, NULL, dst, NULL);
canvas->translate(SkIntToScalar(N + 8), 0);
canvas->drawBitmapRect(bitmap, NULL, dst, &paint);
SkShader* s = SkShader::CreateBitmapShader(bitmap,
SkShader::kRepeat_TileMode,
SkShader::kRepeat_TileMode);
paint.setShader(s)->unref();
SkMatrix m;
m.setScale(SkIntToScalar(fWidth) / N,
SkIntToScalar(fWidth) / N);
s->setLocalMatrix(m);
SkRect r;
r.set(0, 0, SkIntToScalar(4*N), SkIntToScalar(5*N/2));
r.offset(SkIntToScalar(N + 12), -SkIntToScalar(N + 4));
canvas->drawRect(r, paint);
this->inval(NULL);
}
private:
int fWidth, fDW;
typedef SkView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new MipMapView; }
static SkViewRegister reg(MyFactory);