add sample for mipmaps

git-svn-id: http://skia.googlecode.com/svn/trunk@218 2bbb7eff-a529-9590-31e7-b0007b416f81

2 files changed, 140 insertions, 0 deletions

diff --git a/samplecode/SampleMipMap.cpp b/samplecode/SampleMipMap.cpp
new file mode 100644
index 0000000000..025cb0714a
--- /dev/null
+++ b/samplecode/SampleMipMap.cpp
@@ -0,0 +1,136 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkDevice.h"
+#include "SkPaint.h"
+
+static SkBitmap createBitmap(int n) {
+    SkBitmap bitmap;
+    bitmap.setConfig(SkBitmap::kARGB_8888_Config, n, n);
+    bitmap.allocPixels();
+    bitmap.eraseColor(0);
+    
+    SkCanvas canvas(bitmap);
+    SkRect r;
+    r.set(0, 0, SkIntToScalar(n), SkIntToScalar(n));
+    SkPaint paint;
+    paint.setAntiAlias(true);
+    
+    paint.setColor(SK_ColorRED);
+    canvas.drawOval(r, paint);
+    paint.setColor(SK_ColorBLUE);
+    paint.setStrokeWidth(SkIntToScalar(n)/15);
+    paint.setStyle(SkPaint::kStroke_Style);
+    canvas.drawLine(0, 0, r.fRight, r.fBottom, paint);
+    canvas.drawLine(0, r.fBottom, r.fRight, 0, paint);
+    
+    return bitmap;
+}
+
+class MipMapView : public SkView {
+    SkBitmap fBitmap;
+    enum {
+        N = 128
+    };
+public:
+    MipMapView() {
+        fBitmap = createBitmap(N);
+        
+        fWidth = N;
+        fDW = -1;
+    }
+    
+protected:
+    // overrides from SkEventSink
+    virtual bool onQuery(SkEvent* evt) {
+        if (SampleCode::TitleQ(*evt)) {
+            SampleCode::TitleR(evt, "MapMaps");
+            return true;
+        }
+        return this->INHERITED::onQuery(evt);
+    }
+    
+    void drawN(SkCanvas* canvas, const SkBitmap& bitmap) {
+        SkAutoCanvasRestore acr(canvas, true);
+        for (int i = N; i > 1; i >>= 1) {
+            canvas->drawBitmap(bitmap, 0, 0, NULL);
+            canvas->translate(SkIntToScalar(N + 8), 0);
+            canvas->scale(SK_ScalarHalf, SK_ScalarHalf);
+        }
+    }
+    
+    void drawN2(SkCanvas* canvas, const SkBitmap& bitmap) {
+        SkBitmap bg;
+        bg.setConfig(SkBitmap::kARGB_8888_Config, N, N);
+        bg.allocPixels();
+        
+        SkAutoCanvasRestore acr(canvas, true);
+        for (int i = 0; i < N-2; i++) {
+            bg.eraseColor(0);
+            SkCanvas c(bg);
+            c.scale(SK_Scalar1 / (1 << i), SK_Scalar1 / (1 << i));
+            c.drawBitmap(bitmap, 0, 0, NULL);
+
+            canvas->save();
+            canvas->scale(SkIntToScalar(1 << i), SkIntToScalar(1 << i));
+            canvas->drawBitmap(bg, 0, 0, NULL);
+            canvas->restore();
+            canvas->translate(SkIntToScalar(N + 8), 0);
+        }
+    }
+    
+    void drawBG(SkCanvas* canvas) {
+        canvas->drawColor(SK_ColorWHITE);
+    }
+    
+    virtual void onDraw(SkCanvas* canvas) {
+        this->drawBG(canvas);
+        
+        canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
+
+        drawN2(canvas, fBitmap);
+
+        canvas->translate(0, SkIntToScalar(N + 8));
+        SkBitmap bitmap(fBitmap);
+        bitmap.buildMipMap();
+        drawN2(canvas, bitmap);
+        
+        fWidth += fDW;
+        if (fDW > 0 && fWidth > N) {
+            fDW = -fDW;
+            fWidth = N;
+        } else if (fDW < 0 && fWidth < 8) {
+            fDW = -fDW;
+            fWidth = 8;
+        }
+
+        SkRect dst;
+        dst.set(0, 0, SkIntToScalar(fWidth), SkIntToScalar(fWidth));
+
+        SkPaint paint;
+        paint.setFilterBitmap(true);
+        paint.setAntiAlias(true);
+
+        canvas->translate(0, SkIntToScalar(N + 8));
+        canvas->drawBitmapRect(fBitmap, NULL, dst, NULL);
+        canvas->translate(SkIntToScalar(N + 8), 0);
+        canvas->drawBitmapRect(fBitmap, NULL, dst, &paint);
+        canvas->translate(SkIntToScalar(N + 8), 0);
+        canvas->drawBitmapRect(bitmap, NULL, dst, NULL);
+        canvas->translate(SkIntToScalar(N + 8), 0);
+        canvas->drawBitmapRect(bitmap, NULL, dst, &paint);
+        
+        this->inval(NULL);
+    }
+    
+private:
+    int fWidth, fDW;
+
+    typedef SkView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new MipMapView; }
+static SkViewRegister reg(MyFactory);
+
diff --git a/xcode/sampleapp/SampleApp.xcodeproj/project.pbxproj b/xcode/sampleapp/SampleApp.xcodeproj/project.pbxproj
index c67031436d..0ca9d9f286 100644
--- a/xcode/sampleapp/SampleApp.xcodeproj/project.pbxproj
+++ b/xcode/sampleapp/SampleApp.xcodeproj/project.pbxproj
@@ -79,6 +79,7 @@
 		2762F66D0FCCCABE002BD8B4 /* SkFlipPixelRef.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 2762F66B0FCCCABE002BD8B4 /* SkFlipPixelRef.cpp */; };
 		2762F66E0FCCCABE002BD8B4 /* SkPageFlipper.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 2762F66C0FCCCABE002BD8B4 /* SkPageFlipper.cpp */; };
 		2762F67D0FCCCB01002BD8B4 /* SamplePageFlip.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 2762F6770FCCCB01002BD8B4 /* SamplePageFlip.cpp */; };
+		2794C04F0FE72903009AD112 /* SampleMipMap.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 2794C04E0FE72903009AD112 /* SampleMipMap.cpp */; };
 		8D0C4E8D0486CD37000505A6 /* InfoPlist.strings in Resources */ = {isa = PBXBuildFile; fileRef = 0867D6AAFE840B52C02AAC07 /* InfoPlist.strings */; };
 		8D0C4E8E0486CD37000505A6 /* main.nib in Resources */ = {isa = PBXBuildFile; fileRef = 02345980000FD03B11CA0E72 /* main.nib */; };
 		8D0C4E920486CD37000505A6 /* Carbon.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 20286C33FDCF999611CA2CEA /* Carbon.framework */; };
@@ -211,6 +212,7 @@
 		2762F6770FCCCB01002BD8B4 /* SamplePageFlip.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = SamplePageFlip.cpp; path = ../../samplecode/SamplePageFlip.cpp; sourceTree = SOURCE_ROOT; };
 		2762F6780FCCCB01002BD8B4 /* SamplePolyToPoly.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = SamplePolyToPoly.cpp; path = ../../samplecode/SamplePolyToPoly.cpp; sourceTree = SOURCE_ROOT; };
 		2762F6790FCCCB01002BD8B4 /* SampleTests.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = SampleTests.cpp; path = ../../samplecode/SampleTests.cpp; sourceTree = SOURCE_ROOT; };
+		2794C04E0FE72903009AD112 /* SampleMipMap.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = SampleMipMap.cpp; path = ../../samplecode/SampleMipMap.cpp; sourceTree = SOURCE_ROOT; };
 		32DBCF6D0370B57F00C91783 /* CICarbonSample_Prefix.pch */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = CICarbonSample_Prefix.pch; sourceTree = "<group>"; };
 		4A9504C8FFE6A3BC11CA0CBA /* ApplicationServices.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = ApplicationServices.framework; path = /System/Library/Frameworks/ApplicationServices.framework; sourceTree = "<absolute>"; };
 		4A9504CAFFE6A41611CA0CBA /* CoreServices.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = CoreServices.framework; path = /System/Library/Frameworks/CoreServices.framework; sourceTree = "<absolute>"; };
@@ -267,6 +269,7 @@
 				008C4D970F77DAEE0056981C /* SampleHairline.cpp */,
 				0041CE1F0F00A12400695E8C /* SampleCamera.cpp */,
 				0041CE200F00A12400695E8C /* SampleCircle.cpp */,
+				2794C04E0FE72903009AD112 /* SampleMipMap.cpp */,
 				0041CE210F00A12400695E8C /* SampleCode.h */,
 				0041CE220F00A12400695E8C /* SampleCull.cpp */,
 				0041CE230F00A12400695E8C /* SampleDither.cpp */,
@@ -571,6 +574,7 @@
 				00A7295D0FD8397600D5051F /* SampleAll.cpp in Sources */,
 				000A99820FD97526007E45BD /* SampleArc.cpp in Sources */,
 				00AF77B00FE2EA2D007F9650 /* SampleTestGL.cpp in Sources */,
+				2794C04F0FE72903009AD112 /* SampleMipMap.cpp in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};