grab from latest android
git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleTextAlpha.cpp b/samplecode/SampleTextAlpha.cpp
new file mode 100644
index 0000000..f2a6530
--- /dev/null
+++ b/samplecode/SampleTextAlpha.cpp
@@ -0,0 +1,123 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkBlurMaskFilter.h"
+#include "SkCanvas.h"
+#include "SkGradientShader.h"
+#include "SkGraphics.h"
+#include "SkImageDecoder.h"
+#include "SkPath.h"
+#include "SkPorterDuff.h"
+#include "SkRandom.h"
+#include "SkRegion.h"
+#include "SkShader.h"
+#include "SkUtils.h"
+#include "SkXfermode.h"
+#include "SkShaderExtras.h"
+#include "SkColorPriv.h"
+#include "SkColorFilter.h"
+#include "SkTime.h"
+#include "SkTypeface.h"
+
+#include "SkImageRef.h"
+#include "SkOSFile.h"
+#include "SkStream.h"
+
+static void check_for_nonwhite(const SkBitmap& bm, int alpha) {
+ if (bm.config() != SkBitmap::kRGB_565_Config) {
+ return;
+ }
+
+ for (int y = 0; y < bm.height(); y++) {
+ for (int x = 0; x < bm.width(); x++) {
+ uint16_t c = *bm.getAddr16(x, y);
+ if (c != 0xFFFF) {
+ SkDebugf("------ nonwhite alpha=%x [%d %d] %x\n", alpha, x, y, c);
+ return;
+ }
+ }
+ }
+}
+
+class TextAlphaView : public SkView {
+public:
+ TextAlphaView() {
+ fByte = 0xFF;
+ }
+
+protected:
+ // overrides from SkEventSink
+ virtual bool onQuery(SkEvent* evt) {
+ if (SampleCode::TitleQ(*evt)) {
+ SkString str("TextAlpha");
+ SampleCode::TitleR(evt, str.c_str());
+ return true;
+ }
+ return this->INHERITED::onQuery(evt);
+ }
+
+ void drawBG(SkCanvas* canvas) {
+ canvas->drawColor(SK_ColorWHITE);
+ }
+
+ virtual void onDraw(SkCanvas* canvas) {
+ this->drawBG(canvas);
+
+ const char* str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+ SkPaint paint;
+ SkScalar x = SkIntToScalar(10);
+ SkScalar y = SkIntToScalar(20);
+
+ paint.setFlags(0x105);
+
+ paint.setARGB(fByte, 0xFF, 0xFF, 0xFF);
+
+ paint.setMaskFilter(SkBlurMaskFilter::Create(SkIntToScalar(3),
+ SkBlurMaskFilter::kNormal_BlurStyle));
+ paint.getMaskFilter()->unref();
+
+ SkRandom rand;
+
+ for (int ps = 6; ps <= 35; ps++) {
+ paint.setColor(rand.nextU() | (0xFF << 24));
+ paint.setTextSize(SkIntToScalar(ps));
+ paint.setTextSize(SkIntToScalar(24));
+ canvas->drawText(str, strlen(str), x, y, paint);
+ y += paint.getFontMetrics(NULL);
+ }
+ //check_for_nonwhite(canvas->getDevice()->accessBitmap(), fByte);
+ //SkDebugf("------ byte %x\n", fByte);
+
+ if (false) {
+ fByte += 1;
+ fByte &= 0xFF;
+ this->inval(NULL);
+ }
+ }
+
+ virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
+ return new Click(this);
+ }
+
+ virtual bool onClick(Click* click) {
+ int y = click->fICurr.fY;
+ if (y < 0) {
+ y = 0;
+ } else if (y > 255) {
+ y = 255;
+ }
+ fByte = y;
+ this->inval(NULL);
+ return true;
+ }
+
+private:
+ int fByte;
+
+ typedef SkView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new TextAlphaView; }
+static SkViewRegister reg(MyFactory);
+