add test for hairlines and xfermodes
git-svn-id: http://skia.googlecode.com/svn/trunk@2242 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleHairModes.cpp b/samplecode/SampleHairModes.cpp
new file mode 100644
index 0000000..cc22b17
--- /dev/null
+++ b/samplecode/SampleHairModes.cpp
@@ -0,0 +1,150 @@
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkDevice.h"
+#include "SkColorPriv.h"
+#include "SkShader.h"
+
+static SkCanvas* create_canvas(int w, int h) {
+ SkBitmap bm;
+ bm.setConfig(SkBitmap::kARGB_8888_Config, w, h);
+ bm.allocPixels();
+ bm.eraseColor(0);
+ return new SkCanvas(bm);
+}
+
+static const SkBitmap& extract_bitmap(SkCanvas* canvas) {
+ return canvas->getDevice()->accessBitmap(false);
+}
+
+static const struct {
+ SkXfermode::Mode fMode;
+ const char* fLabel;
+} gModes[] = {
+ { SkXfermode::kClear_Mode, "Clear" },
+ { SkXfermode::kSrc_Mode, "Src" },
+ { SkXfermode::kDst_Mode, "Dst" },
+ { SkXfermode::kSrcOver_Mode, "SrcOver" },
+ { SkXfermode::kDstOver_Mode, "DstOver" },
+ { SkXfermode::kSrcIn_Mode, "SrcIn" },
+ { SkXfermode::kDstIn_Mode, "DstIn" },
+ { SkXfermode::kSrcOut_Mode, "SrcOut" },
+ { SkXfermode::kDstOut_Mode, "DstOut" },
+ { SkXfermode::kSrcATop_Mode, "SrcATop" },
+ { SkXfermode::kDstATop_Mode, "DstATop" },
+ { SkXfermode::kXor_Mode, "Xor" },
+};
+
+const int gWidth = 64;
+const int gHeight = 64;
+const SkScalar W = SkIntToScalar(gWidth);
+const SkScalar H = SkIntToScalar(gHeight);
+
+static SkScalar drawCell(SkCanvas* canvas, SkXfermode* mode, SkAlpha a0, SkAlpha a1) {
+
+ SkPaint paint;
+ paint.setAntiAlias(true);
+
+ SkRect r = SkRect::MakeWH(W, H);
+ r.inset(W/10, H/10);
+
+ paint.setColor(SK_ColorBLUE);
+ paint.setAlpha(a0);
+ canvas->drawOval(r, paint);
+
+ paint.setColor(SK_ColorRED);
+ paint.setAlpha(a1);
+ paint.setXfermode(mode);
+ for (int angle = 0; angle < 24; ++angle) {
+ SkScalar x = SkScalarCos(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gWidth;
+ SkScalar y = SkScalarSin(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gHeight;
+ paint.setStrokeWidth(SK_Scalar1 * angle * 2 / 24);
+ canvas->drawLine(W/2, H/2, W/2 + x, H/2 + y, paint);
+ }
+
+ return H;
+}
+
+static SkShader* make_bg_shader() {
+ SkBitmap bm;
+ bm.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
+ bm.allocPixels();
+ *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF;
+ *bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = SkPackARGB32(0xFF, 0xCC, 0xCC, 0xCC);
+
+ SkShader* s = SkShader::CreateBitmapShader(bm,
+ SkShader::kRepeat_TileMode,
+ SkShader::kRepeat_TileMode);
+
+ SkMatrix m;
+ m.setScale(SkIntToScalar(6), SkIntToScalar(6));
+ s->setLocalMatrix(m);
+ return s;
+}
+
+class HairModesView : public SampleView {
+ SkPaint fBGPaint;
+public:
+ HairModesView() {
+ fBGPaint.setShader(make_bg_shader())->unref();
+ }
+
+protected:
+ // overrides from SkEventSink
+ virtual bool onQuery(SkEvent* evt) {
+ if (SampleCode::TitleQ(*evt)) {
+ SampleCode::TitleR(evt, "HairlineModes");
+ return true;
+ }
+ return this->INHERITED::onQuery(evt);
+ }
+
+ virtual void onDrawContent(SkCanvas* canvas) {
+ const SkRect bounds = SkRect::MakeWH(W, H);
+ static const SkAlpha gAlphaValue[] = { 0xFF, 0x88, 0x88 };
+
+ canvas->translate(SkIntToScalar(4), SkIntToScalar(4));
+
+ for (int alpha = 0; alpha < 4; ++alpha) {
+ canvas->save();
+ canvas->save();
+ for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); ++i) {
+ if (6 == i) {
+ canvas->restore();
+ canvas->translate(W * 5, 0);
+ canvas->save();
+ }
+ SkXfermode* mode = SkXfermode::Create(gModes[i].fMode);
+
+ canvas->drawRect(bounds, fBGPaint);
+ canvas->saveLayer(&bounds, NULL);
+ SkScalar dy = drawCell(canvas, mode,
+ gAlphaValue[alpha & 1],
+ gAlphaValue[alpha & 2]);
+ canvas->restore();
+
+ canvas->translate(0, dy * 5 / 4);
+ SkSafeUnref(mode);
+ }
+ canvas->restore();
+ canvas->restore();
+ canvas->translate(W * 5 / 4, 0);
+ }
+ }
+
+private:
+ typedef SampleView INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new HairModesView; }
+static SkViewRegister reg(MyFactory);
+