grab from latest android
git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleShaders.cpp b/samplecode/SampleShaders.cpp
new file mode 100644
index 0000000..4d82182
--- /dev/null
+++ b/samplecode/SampleShaders.cpp
@@ -0,0 +1,157 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkGradientShader.h"
+#include "SkGraphics.h"
+#include "SkImageDecoder.h"
+#include "SkPath.h"
+#include "SkPorterDuff.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 "SkTransparentShader.h"
+#include "SkTypeface.h"
+
+static SkShader* make_bitmapfade(const SkBitmap& bm)
+{
+ SkPoint pts[2];
+ SkColor colors[2];
+
+ pts[0].set(0, 0);
+ pts[1].set(0, SkIntToScalar(bm.height()));
+ colors[0] = SK_ColorBLACK;
+ colors[1] = SkColorSetARGB(0, 0, 0, 0);
+ SkShader* shaderA = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode);
+
+ SkShader* shaderB = SkShader::CreateBitmapShader(bm,
+ SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
+
+ SkXfermode* mode = SkPorterDuff::CreateXfermode(SkPorterDuff::kDstIn_Mode);
+
+ SkShader* shader = new SkComposeShader(shaderB, shaderA, mode);
+ shaderA->unref();
+ shaderB->unref();
+ mode->unref();
+
+ return shader;
+}
+
+class ShaderView : public SkView {
+public:
+ SkShader* fShader;
+ SkBitmap fBitmap;
+
+ ShaderView()
+ {
+ SkImageDecoder::DecodeFile("/cover.png", &fBitmap);
+
+ SkPoint pts[2];
+ SkColor colors[2];
+
+ pts[0].set(0, 0);
+ pts[1].set(SkIntToScalar(100), 0);
+ colors[0] = SK_ColorRED;
+ colors[1] = SK_ColorBLUE;
+ SkShader* shaderA = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode);
+
+ pts[0].set(0, 0);
+ pts[1].set(0, SkIntToScalar(100));
+ colors[0] = SK_ColorBLACK;
+ colors[1] = SkColorSetARGB(0x80, 0, 0, 0);
+ SkShader* shaderB = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode);
+
+ SkXfermode* mode = SkPorterDuff::CreateXfermode(SkPorterDuff::kDstIn_Mode);
+
+ fShader = new SkComposeShader(shaderA, shaderB, mode);
+ shaderA->unref();
+ shaderB->unref();
+ mode->unref();
+ }
+ virtual ~ShaderView()
+ {
+ fShader->safeUnref();
+ }
+
+protected:
+ // overrides from SkEventSink
+ virtual bool onQuery(SkEvent* evt)
+ {
+ if (SampleCode::TitleQ(*evt))
+ {
+ SampleCode::TitleR(evt, "Shaders");
+ 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);
+
+ canvas->drawBitmap(fBitmap, 0, 0);
+
+ {
+ SkIRect src;
+ SkRect dst;
+
+ src.set(20, 50, 120, 70);
+ dst.set(src);
+ dst.offset(SkIntToScalar(300), 0);
+
+ canvas->drawBitmapRect(fBitmap, &src, dst);
+ }
+
+ canvas->translate(SkIntToScalar(80), SkIntToScalar(80));
+
+ SkPaint paint;
+ SkRect r;
+
+ paint.setColor(SK_ColorGREEN);
+ canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint);
+ paint.setShader(fShader);
+ canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint);
+
+ canvas->translate(SkIntToScalar(110), 0);
+
+ r.set(0, 0, SkIntToScalar(fBitmap.width()), SkIntToScalar(fBitmap.height()));
+
+ paint.setShader(NULL);
+ canvas->drawRect(r, paint);
+ paint.setShader(make_bitmapfade(fBitmap))->unref();
+ canvas->drawRect(r, paint);
+
+ paint.setShader(new SkTransparentShader)->unref();
+ canvas->drawRect(r, paint);
+ }
+
+ 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 ShaderView; }
+static SkViewRegister reg(MyFactory);
+