grab from latest android
git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SamplePageFlip.cpp b/samplecode/SamplePageFlip.cpp
new file mode 100644
index 0000000..6b1adfd
--- /dev/null
+++ b/samplecode/SamplePageFlip.cpp
@@ -0,0 +1,173 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkGraphics.h"
+#include "SkRandom.h"
+#include "SkFlipPixelRef.h"
+#include "SkPageFlipper.h"
+
+#include <pthread.h>
+
+#define WIDTH 200
+#define HEIGHT 200
+
+static bool gDone;
+
+static void bounce(SkScalar* x, SkScalar* dx, const int max) {
+ *x += *dx;
+ if (*x < 0) {
+ *x = 0;
+ if (*dx < 0) {
+ *dx = -*dx;
+ }
+ } else if (*x > SkIntToScalar(max)) {
+ *x = SkIntToScalar(max);
+ if (*dx > 0) {
+ *dx = -*dx;
+ }
+ }
+}
+
+static void* draw_proc(void* context) {
+ const int OVALW = 32;
+ const int OVALH = 32;
+
+ const SkBitmap* bm = static_cast<const SkBitmap*>(context);
+ SkFlipPixelRef* ref = static_cast<SkFlipPixelRef*>(bm->pixelRef());
+
+ const int DSCALE = 1;
+ SkScalar dx = SkIntToScalar(7) / DSCALE;
+ SkScalar dy = SkIntToScalar(5) / DSCALE;
+ SkScalar x = 0;
+ SkScalar y = 0;
+
+ SkPaint paint;
+
+ paint.setAntiAlias(true);
+ paint.setColor(reinterpret_cast<SkColor>(ref) | (0xFF << 24));
+
+ SkRect oval;
+ oval.setEmpty();
+
+ while (!gDone) {
+ ref->inval(oval, true);
+ oval.set(x, y, x + SkIntToScalar(OVALW), y + SkIntToScalar(OVALH));
+ ref->inval(oval, true);
+
+ SkAutoFlipUpdate update(ref);
+
+ if (!update.dirty().isEmpty()) {
+ // this must be local to the loop, since it needs to forget the pixels
+ // its writing to after each iteration, since we do the swap
+ SkCanvas canvas(update.bitmap());
+
+// SkDebugf("----- dirty [%d %d %d %d]\n", dirty.getBounds().fLeft, dirty.getBounds().fTop, dirty.getBounds().width(), dirty.getBounds().height());
+ canvas.clipRegion(update.dirty());
+
+ canvas.drawColor(0, SkPorterDuff::kClear_Mode);
+ canvas.drawOval(oval, paint);
+ }
+ bounce(&x, &dx, WIDTH-OVALW);
+ bounce(&y, &dy, HEIGHT-OVALH);
+
+#if 1
+ for (int i = 0; i < 1000; i++) {
+ for (int j = 0; j < 10000; j++) {
+ SkFixedMul(j, 10);
+ }
+ }
+#endif
+ }
+ return NULL;
+}
+
+static const SkBitmap::Config gConfigs[] = {
+ SkBitmap::kARGB_8888_Config,
+#if 1
+ SkBitmap::kRGB_565_Config,
+ SkBitmap::kARGB_4444_Config,
+ SkBitmap::kA8_Config
+#endif
+};
+
+class PageFlipView : public SkView {
+public:
+
+ enum { N = SK_ARRAY_COUNT(gConfigs) };
+
+ pthread_t fThreads[N];
+ SkBitmap fBitmaps[N];
+
+ PageFlipView() {
+ gDone = false;
+ for (int i = 0; i < N; i++) {
+ int status;
+ pthread_attr_t attr;
+
+ status = pthread_attr_init(&attr);
+ SkASSERT(0 == status);
+
+ fBitmaps[i].setConfig(gConfigs[i], WIDTH, HEIGHT);
+ SkFlipPixelRef* pr = new SkFlipPixelRef(gConfigs[i], WIDTH, HEIGHT);
+ fBitmaps[i].setPixelRef(pr)->unref();
+ fBitmaps[i].eraseColor(0);
+
+ status = pthread_create(&fThreads[i], &attr, draw_proc, &fBitmaps[i]);
+ SkASSERT(0 == status);
+ }
+ }
+
+ virtual ~PageFlipView() {
+ gDone = true;
+ for (int i = 0; i < N; i++) {
+ void* ret;
+ int status = pthread_join(fThreads[i], &ret);
+ SkASSERT(0 == status);
+ }
+ }
+
+protected:
+ // overrides from SkEventSink
+ virtual bool onQuery(SkEvent* evt) {
+ if (SampleCode::TitleQ(*evt)) {
+ SampleCode::TitleR(evt, "PageFlip");
+ return true;
+ }
+ return this->INHERITED::onQuery(evt);
+ }
+
+ void drawBG(SkCanvas* canvas) {
+ canvas->drawColor(0xFFDDDDDD);
+// canvas->drawColor(SK_ColorWHITE);
+ }
+
+ virtual void onDraw(SkCanvas* canvas) {
+ this->drawBG(canvas);
+
+ SkScalar x = SkIntToScalar(10);
+ SkScalar y = SkIntToScalar(10);
+ for (int i = 0; i < N; i++) {
+ canvas->drawBitmap(fBitmaps[i], x, y);
+ x += SkIntToScalar(fBitmaps[i].width() + 20);
+ }
+ this->inval(NULL);
+ }
+
+ virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
+ this->inval(NULL);
+ return this->INHERITED::onFindClickHandler(x, y);
+ }
+
+ virtual bool onClick(Click* click) {
+ return this->INHERITED::onClick(click);
+ }
+
+private:
+ typedef SkView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new PageFlipView; }
+static SkViewRegister reg(MyFactory);
+