update dox for SkAvoidXfermode (as best I could)
fix 565 and 4444 implementations
git-svn-id: http://skia.googlecode.com/svn/trunk@420 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleAvoid.cpp b/samplecode/SampleAvoid.cpp
new file mode 100644
index 0000000..faeee20
--- /dev/null
+++ b/samplecode/SampleAvoid.cpp
@@ -0,0 +1,101 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkGradientShader.h"
+#include "SkAvoidXfermode.h"
+
+///////////////////////////////////////////////////////////////////////////////
+
+class AvoidView : public SkView {
+ SkShader* fShader;
+
+ enum {
+ W = 480,
+ H = 320
+ };
+public:
+ AvoidView() {
+ SkColor colors[] = { SK_ColorRED, SK_ColorYELLOW, SK_ColorGREEN, SK_ColorCYAN, SK_ColorBLUE };
+
+#if 0
+ SkPoint pts[] = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
+ fShader = SkGradientShader::CreateLinear(pts, colors, NULL,
+ SK_ARRAY_COUNT(colors),
+ SkShader::kMirror_TileMode);
+#else
+ SkPoint pts[] = { SkIntToScalar(W)/2, SkIntToScalar(H)/2 };
+ fShader = SkGradientShader::CreateRadial(pts[0], SkIntToScalar(H)/5,
+ colors, NULL,
+ SK_ARRAY_COUNT(colors),
+ SkShader::kMirror_TileMode);
+#endif
+ }
+
+ virtual ~AvoidView() {
+ fShader->unref();
+ }
+
+protected:
+ virtual bool onQuery(SkEvent* evt) {
+ if (SampleCode::TitleQ(*evt)) {
+ SampleCode::TitleR(evt, "AvoidXfermode");
+ return true;
+ }
+ return this->INHERITED::onQuery(evt);
+ }
+
+ virtual void onDraw(SkCanvas* canvas) {
+ canvas->drawColor(SK_ColorWHITE);
+
+ SkPaint paint;
+ SkRect r = { 0, 0, SkIntToScalar(W), SkIntToScalar(H) };
+
+ canvas->translate(r.width() / 6, r.height() / 6);
+
+ paint.setShader(fShader);
+ canvas->drawRect(r, paint);
+
+ static const struct {
+ int fTolerance;
+ SkAvoidXfermode::Mode fMode;
+ float fDX, fDY;
+ } gData[] = {
+ { 16, SkAvoidXfermode::kAvoidColor_Mode, 0, 0 },
+ { 255-16, SkAvoidXfermode::kAvoidColor_Mode, 1, 0 },
+ { 16, SkAvoidXfermode::kTargetColor_Mode, 0, 1 },
+ { 255-16, SkAvoidXfermode::kTargetColor_Mode, 1, 1 },
+ };
+
+ paint.setShader(NULL);
+ paint.setColor(SK_ColorMAGENTA);
+
+ SkPaint frameP;
+ frameP.setStyle(SkPaint::kStroke_Style);
+
+ for (size_t i = 0; i < SK_ARRAY_COUNT(gData); i++) {
+ SkAvoidXfermode mode(SK_ColorGREEN, gData[i].fTolerance,
+ gData[i].fMode);
+ paint.setXfermode(&mode);
+ int div = 3;
+ SkRect rr = { 0, 0, r.width()/div, r.height()/div };
+ rr.offset(r.width()/4 - rr.width()/2, r.height()/4 - rr.height()/2);
+ rr.offset(r.width() * gData[i].fDX/2, r.height() * gData[i].fDY/2);
+ canvas->drawRect(rr, paint);
+ paint.setXfermode(NULL);
+
+ canvas->drawRect(rr, frameP);
+ }
+ }
+
+private:
+ typedef SkView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() {
+ return new AvoidView;
+}
+
+static SkViewRegister reg(MyFactory);
+