grab from latest android
git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleLines.cpp b/samplecode/SampleLines.cpp
new file mode 100644
index 0000000..eed0e5a
--- /dev/null
+++ b/samplecode/SampleLines.cpp
@@ -0,0 +1,147 @@
+#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 "SkShaderExtras.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);
+