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#include "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "Sk64.h"
#include "SkCornerPathEffect.h"
#include "SkGradientShader.h"
#include "SkGraphics.h"
#include "SkImageDecoder.h"
#include "SkKernel33MaskFilter.h"
#include "SkPath.h"
#include "SkRandom.h"
#include "SkRegion.h"
#include "SkShader.h"
#include "SkUtils.h"
#include "SkColorPriv.h"
#include "SkColorFilter.h"
#include "SkTime.h"
#include "SkTypeface.h"
#include "SkXfermode.h"
#include "SkStream.h"
#include "SkXMLParser.h"
#include "SkColorPriv.h"
#include "SkImageDecoder.h"
class LinesView : public SkView {
public:
LinesView()
{
unsigned r = 0x1F;
unsigned g = 0x3F;
for (unsigned a = 0; a <= 0xF; a++) {
unsigned scale = 16 - SkAlpha15To16(a);
unsigned sr = (a << 1) | (a >> 3);
unsigned dr = r * scale >> 4;
unsigned sg = (a << 2) | (a >> 2);
unsigned dg = g * scale >> 4;
unsigned ssg = sg & ~(~(a >> 3) & 1);
printf("4444 sa=%d sr=%d sg=%d da=%d dr=%d dg=%d total-r=%d total-g=%d %d\n",
a, sr, sg, scale, dr, dg, sr+dr, sg+dg, ssg+dg);
}
for (unsigned aa = 0; aa <= 0xFF; aa++) {
unsigned invScale = SkAlpha255To256(255 - aa);
unsigned dst = SkAlphaMul(0xFF, invScale);
printf("8888 sa=%02x dst=%02x sum=%d %s\n", aa, dst, aa+dst,
(aa+dst) > 0xFF ? "OVERFLOW" : "");
}
}
protected:
// overrides from SkEventSink
virtual bool onQuery(SkEvent* evt)
{
if (SampleCode::TitleQ(*evt))
{
SampleCode::TitleR(evt, "Lines");
return true;
}
return this->INHERITED::onQuery(evt);
}
void drawBG(SkCanvas* canvas)
{
// canvas->drawColor(0xFFDDDDDD);
canvas->drawColor(SK_ColorWHITE);
// canvas->drawColor(SK_ColorBLACK);
}
/*
0x1F * x + 0x1F * (32 - x)
*/
void drawRings(SkCanvas* canvas)
{
canvas->scale(SkIntToScalar(1)/2, SkIntToScalar(1)/2);
SkRect r;
SkScalar x = SkIntToScalar(10);
SkScalar y = SkIntToScalar(10);
r.set(x, y, x + SkIntToScalar(100), y + SkIntToScalar(100));
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(SkScalarHalf(SkIntToScalar(3)));
paint.setColor(0xFFFF8800);
paint.setColor(0xFFFFFFFF);
canvas->drawRect(r, paint);
}
virtual void onDraw(SkCanvas* canvas)
{
this->drawBG(canvas);
SkBitmap bm;
SkImageDecoder::DecodeFile("/kill.gif", &bm);
canvas->drawBitmap(bm, 0, 0, NULL);
this->drawRings(canvas);
return;
SkPaint paint;
// fAlpha = 0x80;
paint.setColor(SK_ColorWHITE);
paint.setAlpha(fAlpha & 0xFF);
SkRect r;
SkScalar x = SkIntToScalar(10);
SkScalar y = SkIntToScalar(10);
r.set(x, y, x + SkIntToScalar(100), y + SkIntToScalar(100));
canvas->drawRect(r, paint);
return;
paint.setColor(0xffffff00); // yellow
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(SkIntToScalar(2));
// y += SK_Scalar1/2;
canvas->drawLine(x, y, x + SkIntToScalar(90), y + SkIntToScalar(90), paint);
paint.setAntiAlias(true); // with anti-aliasing
y += SkIntToScalar(10);
canvas->drawLine(x, y, x + SkIntToScalar(90), y + SkIntToScalar(90), paint);
}
virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y)
{
fAlpha = SkScalarRound(y);
this->inval(NULL);
return NULL;
}
private:
int fAlpha;
typedef SkView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new LinesView; }
static SkViewRegister reg(MyFactory);
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