grab from latest android

git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 443 insertions, 0 deletions

diff --git a/samplecode/SampleTextOnPath.cpp b/samplecode/SampleTextOnPath.cpp
new file mode 100644
index 0000000000..382b4d9d6e
--- /dev/null
+++ b/samplecode/SampleTextOnPath.cpp
@@ -0,0 +1,443 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkGradientShader.h"
+#include "SkGraphics.h"
+#include "SkImageDecoder.h"
+#include "SkPackBits.h"
+#include "SkPath.h"
+#include "SkPathMeasure.h"
+#include "SkRandom.h"
+#include "SkRegion.h"
+#include "SkShader.h"
+#include "SkUtils.h"
+#include "SkShaderExtras.h"
+#include "SkColorPriv.h"
+#include "SkColorFilter.h"
+#include "SkTypeface.h"
+#include "SkAvoidXfermode.h"
+
+#define REPEAT_COUNT    1
+
+static const char gText[] = "Hamburgefons";
+
+static bool gDevKern;
+
+static void rand_text(char text[], SkRandom& rand, size_t count) {
+    for (size_t i = 0; i < count; i++) {
+        text[i] = rand.nextU() & 0x7F;
+    }
+}
+
+static SkScalar sum_widths(const SkScalar widths[], int count) {
+    SkScalar w = 0;
+    for (int i = 0; i < count; i++) {
+        w += widths[i];
+    }
+    return w;
+}
+
+static void test_measure(const SkPaint& paint) {
+    char        text[256];
+    SkScalar    widths[256];
+    SkRect      rects[256];
+    SkRect      bounds;
+    int         count = 256;
+    
+    SkRandom rand;
+    
+    for (int i = 0; i < 100; i++) {
+        rand_text(text, rand, 256);
+        paint.getTextWidths(text, count, widths, NULL);
+        SkScalar tw0 = sum_widths(widths, count);
+        paint.getTextWidths(text, count, widths, rects);
+        SkScalar tw1 = sum_widths(widths, count);
+        SkASSERT(tw0 == tw1);
+
+        SkScalar w0 = paint.measureText(text, count, NULL);
+        SkScalar w1 = paint.measureText(text, count, &bounds);
+        SkASSERT(w0 == w1);
+        SkASSERT(w0 == tw0);
+        
+        SkRect r = rects[0];
+        SkScalar x = 0;
+        for (int j = 1; j < count; j++) {
+            x += widths[j-1];
+            rects[j].offset(x, 0);
+            r.join(rects[j]);
+        }
+        SkASSERT(r == bounds);
+        
+        if (r != bounds) {
+            printf("flags=%x i=%d [%g %g %g %g] [%g %g %g %g]\n",
+                   paint.getFlags(), i,
+                   SkScalarToFloat(r.fLeft),
+                   SkScalarToFloat(r.fTop),
+                   SkScalarToFloat(r.fRight),
+                   SkScalarToFloat(r.fBottom),
+                   SkScalarToFloat(bounds.fLeft),
+                   SkScalarToFloat(bounds.fTop),
+                   SkScalarToFloat(bounds.fRight),
+                   SkScalarToFloat(bounds.fBottom));
+        }
+    }
+}
+
+static void test_measure() {
+    SkPaint paint;
+    
+    for (int i = 0; i <= SkPaint::kAllFlags; i++) {
+        paint.setFlags(i);
+        test_measure(paint);
+    }
+}
+
+//////////////////////////////////////////////////////////////////////////////
+
+static void test_textBounds(SkCanvas* canvas) {
+//    canvas->scale(SK_Scalar1/2, SK_Scalar1/2);
+    
+//    canvas->rotate(SkIntToScalar(30));
+
+    gDevKern = !gDevKern;
+
+    SkScalar x = SkIntToScalar(50);
+    SkScalar y = SkIntToScalar(150);
+    SkScalar w[100];
+    SkRect   r[100], bounds;
+    
+    SkPaint paint;
+    paint.setTextSize(SkIntToScalar(64));
+    paint.setAntiAlias(true);
+    paint.setDevKernText(gDevKern);
+    
+    (void)paint.measureText(gText, strlen(gText), &bounds, NULL);
+    paint.setColor(SK_ColorGREEN);
+    bounds.offset(x, y);
+    canvas->drawRect(bounds, paint);
+
+    int count = paint.getTextWidths(gText, strlen(gText), w, r);
+
+    paint.setColor(SK_ColorRED);
+    for (int i = 0; i < count; i++) {
+        r[i].offset(x, y);
+        canvas->drawRect(r[i], paint);
+        x += w[i];
+    }
+    x = SkIntToScalar(50);
+    paint.setColor(gDevKern ? SK_ColorDKGRAY : SK_ColorBLACK);
+    canvas->drawText(gText, strlen(gText), x, y, paint);
+}
+
+static void create_src(SkBitmap* bitmap, SkBitmap::Config config) {
+    bitmap->setConfig(config, 100, 100);
+    bitmap->allocPixels();
+    bitmap->eraseColor(0);
+    
+    SkCanvas    canvas(*bitmap);
+    SkPaint     paint;
+
+    paint.setAntiAlias(true);
+    canvas.drawCircle(SkIntToScalar(50), SkIntToScalar(50),
+                      SkIntToScalar(50), paint);
+}
+
+static void blur(SkBitmap* dst, const SkBitmap& src, SkScalar radius) {
+    *dst = src;
+}
+
+static void test_bitmap_blur(SkCanvas* canvas) {
+    SkBitmap    src, dst;
+    
+    create_src(&src, SkBitmap::kARGB_8888_Config);
+    blur(&dst, src, SkIntToScalar(4));
+    
+    SkPaint paint;
+    
+    paint.setColor(SK_ColorRED);
+
+    canvas->drawBitmap(dst, SkIntToScalar(30), SkIntToScalar(60), &paint);
+}
+
+static SkScalar getpathlen(const SkPath& path) {
+    SkPathMeasure   meas(path, false);
+    return meas.getLength();
+}
+
+static void test_textpathmatrix(SkCanvas* canvas) {
+    SkPaint paint;
+    SkPath  path;
+    SkMatrix matrix;
+    
+    path.moveTo(SkIntToScalar(200), SkIntToScalar(300));
+    path.quadTo(SkIntToScalar(400), SkIntToScalar(100),
+                SkIntToScalar(600), SkIntToScalar(300));
+
+    paint.setAntiAlias(true);
+    
+    paint.setStyle(SkPaint::kStroke_Style);
+    canvas->drawPath(path, paint);
+    paint.setStyle(SkPaint::kFill_Style);
+    paint.setTextSize(SkIntToScalar(48));
+    paint.setTextAlign(SkPaint::kRight_Align);
+    
+    const char* text = "Android";
+    size_t      len = strlen(text);
+    SkScalar    pathLen = getpathlen(path);
+
+    canvas->drawTextOnPath(text, len, path, NULL, paint);
+    
+    paint.setColor(SK_ColorRED);
+    matrix.setScale(-SK_Scalar1, SK_Scalar1);
+    matrix.postTranslate(pathLen, 0);
+    canvas->drawTextOnPath(text, len, path, &matrix, paint);
+    
+    paint.setColor(SK_ColorBLUE);
+    matrix.setScale(SK_Scalar1, -SK_Scalar1);
+    canvas->drawTextOnPath(text, len, path, &matrix, paint);
+    
+    paint.setColor(SK_ColorGREEN);
+    matrix.setScale(-SK_Scalar1, -SK_Scalar1);
+    matrix.postTranslate(pathLen, 0);
+    canvas->drawTextOnPath(text, len, path, &matrix, paint);
+}
+
+class TextOnPathView : public SkView {
+public:
+    SkPath      fPath;
+    SkScalar    fHOffset;
+
+	TextOnPathView() {
+        SkRect r;
+        r.set(SkIntToScalar(100), SkIntToScalar(100),
+              SkIntToScalar(300), SkIntToScalar(300));
+        fPath.addOval(r);
+        
+        fHOffset = SkIntToScalar(50);
+    }
+
+protected:
+    // overrides from SkEventSink
+    virtual bool onQuery(SkEvent* evt) {
+        if (SampleCode::TitleQ(*evt)) {
+            SampleCode::TitleR(evt, "Text On Path");
+            return true;
+        }
+        return this->INHERITED::onQuery(evt);
+    }
+    
+    void drawBG(SkCanvas* canvas) {
+        canvas->drawColor(SK_ColorWHITE);
+#if 0        
+        SkRect r;
+        SkPaint p;
+        SkRandom rand;
+        p.setAntiAlias(true);
+        
+        for (int i = 0; i < 100; i++) {
+            SkScalar x = rand.nextUScalar1() * 300 + SkIntToScalar(50);
+            SkScalar y = rand.nextUScalar1() * 200 + SkIntToScalar(50);
+            SkScalar w = rand.nextUScalar1() * 10;
+            SkScalar h = rand.nextUScalar1() * 10;
+            r.set(x, y, x + w, y + h);
+            canvas->drawRect(r, p);
+        }
+        
+        test_textBounds(canvas);
+//        return;
+
+        SkBitmap    bm;
+        if (SkImageDecoder::DecodeFile("/loading_tile.png",
+                                       &bm, SkBitmap::kRGB_565_Config, true))
+            canvas->drawBitmap(bm, 0, 0);
+#endif
+    }
+    
+    virtual void onDraw(SkCanvas* canvas) {
+        this->drawBG(canvas);
+
+        SkPaint paint;
+        
+        paint.setAntiAlias(true);
+        paint.setTextSize(SkIntToScalar(50));
+
+        for (int j = 0; j < REPEAT_COUNT; j++) {
+            SkScalar x = fHOffset;
+
+            paint.setColor(SK_ColorBLACK);
+            canvas->drawTextOnPathHV(gText, sizeof(gText)-1, fPath,
+                                     x, paint.getTextSize()/2, paint);
+
+            paint.setColor(SK_ColorRED);
+            canvas->drawTextOnPathHV(gText, sizeof(gText)-1, fPath,
+                                     x + SkIntToScalar(50), 0, paint);
+
+            paint.setColor(SK_ColorBLUE);
+            canvas->drawTextOnPathHV(gText, sizeof(gText)-1, fPath,
+                         x + SkIntToScalar(100), -paint.getTextSize()/2, paint);
+        }
+        
+        paint.setColor(SK_ColorGREEN);
+        paint.setStyle(SkPaint::kStroke_Style);
+        canvas->drawPath(fPath, paint);
+        
+        canvas->translate(SkIntToScalar(200), 0);
+        test_textpathmatrix(canvas);
+
+        test_bitmap_blur(canvas);
+        
+        if (REPEAT_COUNT > 1)
+            this->inval(NULL);
+    }
+    
+    virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
+        fHints += 1;
+        this->inval(NULL);
+        return this->INHERITED::onFindClickHandler(x, y);
+    }
+    
+    virtual bool onClick(Click* click) {
+        return this->INHERITED::onClick(click);
+    }
+    
+private:
+    int fHints;
+    typedef SkView INHERITED;
+};
+
+static const uint16_t gTest0[] = { 0, 0, 1, 1 };
+static const uint16_t gTest1[] = { 1, 2, 3, 4, 5, 6 };
+static const uint16_t gTest2[] = { 0, 0, 0, 1, 2, 3, 3, 3 };
+static const uint16_t gTest3[] = { 0, 0, 0, 0, 0, 0, 1, 2, 3, 3, 3, 0, 0, 1 };
+
+#include "SkRandom.h"
+static SkRandom gRand;
+static void rand_fill(uint16_t buffer[], int count) {
+    for (int i = 0; i < count; i++)
+        buffer[i] = (uint16_t)gRand.nextU();
+}
+
+static void test_pack16() {
+    static const struct {
+        const uint16_t* fSrc;
+        int             fCount;
+    } gTests[] = {
+        { gTest0, SK_ARRAY_COUNT(gTest0) },
+        { gTest1, SK_ARRAY_COUNT(gTest1) },
+        { gTest2, SK_ARRAY_COUNT(gTest2) },
+        { gTest3, SK_ARRAY_COUNT(gTest3) }
+    };
+    
+    for (size_t i = 0; i < SK_ARRAY_COUNT(gTests); i++) {
+        uint8_t dst[100];
+        size_t dstSize = SkPackBits::Pack16(gTests[i].fSrc,
+                                            gTests[i].fCount, dst);
+        printf("Test[%d] orig size = %d, dst size = %d",
+               i, gTests[i].fCount, (int)dstSize);
+        uint16_t src[100];
+        int srcCount = SkPackBits::Unpack16(dst, dstSize, src);
+        printf(", src size = %d", srcCount);
+        bool match = gTests[i].fCount == srcCount && memcmp(gTests[i].fSrc, src,
+                                    gTests[i].fCount * sizeof(uint16_t)) == 0;
+        printf(", match = %d\n", match);
+    }
+    
+    for (int n = 1000; n; n--) {
+        size_t size = 50;
+        uint16_t src[100], src2[100];
+        uint8_t dst[200];
+        rand_fill(src, size);
+
+        size_t dstSize = SkPackBits::Pack16(src, size, dst);
+        size_t maxSize = SkPackBits::ComputeMaxSize16(size);
+        SkASSERT(maxSize >= dstSize);
+
+        int srcCount = SkPackBits::Unpack16(dst, dstSize, src2);
+        SkASSERT(size == srcCount);
+        bool match = memcmp(src, src2, size * sizeof(uint16_t)) == 0;
+        SkASSERT(match);
+    }
+}
+
+static const uint8_t gTest80[] = { 0, 0, 1, 1 };
+static const uint8_t gTest81[] = { 1, 2, 3, 4, 5, 6 };
+static const uint8_t gTest82[] = { 0, 0, 0, 1, 2, 3, 3, 3 };
+static const uint8_t gTest83[] = { 0, 0, 0, 0, 0, 0, 1, 2, 3, 3, 3, 0, 0, 1 };
+static const uint8_t gTest84[] = { 1, 0, 3, 0, 0, 0, 2, 1, 1, 2 };
+
+static void rand_fill(uint8_t buffer[], int count) {
+    for (int i = 0; i < count; i++)
+        buffer[i] = (uint8_t)((gRand.nextU() >> 8) & 0x3);
+}
+
+static void test_pack8() {
+    static const struct {
+        const uint8_t* fSrc;
+        int             fCount;
+    } gTests[] = {
+        { gTest80, SK_ARRAY_COUNT(gTest80) },
+        { gTest81, SK_ARRAY_COUNT(gTest81) },
+        { gTest82, SK_ARRAY_COUNT(gTest82) },
+        { gTest83, SK_ARRAY_COUNT(gTest83) },
+        { gTest84, SK_ARRAY_COUNT(gTest84) }
+    };
+    
+    for (size_t i = 4; i < SK_ARRAY_COUNT(gTests); i++) {
+        uint8_t dst[100];
+        size_t maxSize = SkPackBits::ComputeMaxSize8(gTests[i].fCount);
+        size_t dstSize = SkPackBits::Pack8(gTests[i].fSrc,
+                                           gTests[i].fCount, dst);
+        SkASSERT(dstSize <= maxSize);
+        printf("Test[%d] orig size = %d, dst size = %d", i,
+               gTests[i].fCount, (int)dstSize);
+        uint8_t src[100];
+        int srcCount = SkPackBits::Unpack8(dst, dstSize, src);
+        printf(", src size = %d", srcCount);
+        bool match = gTests[i].fCount == srcCount &&
+                    memcmp(gTests[i].fSrc, src,
+                           gTests[i].fCount * sizeof(uint8_t)) == 0;
+        printf(", match = %d\n", match);
+    }
+
+    for (size_t size = 1; size <= 512; size += 1) {
+        for (int n = 200; n; n--) {
+            uint8_t src[600], src2[600];
+            uint8_t dst[600];
+            rand_fill(src, size);
+
+            size_t dstSize = SkPackBits::Pack8(src, size, dst);
+            size_t maxSize = SkPackBits::ComputeMaxSize8(size);
+            SkASSERT(maxSize >= dstSize);
+
+            int srcCount = SkPackBits::Unpack8(dst, dstSize, src2);
+            SkASSERT(size == srcCount);
+            bool match = memcmp(src, src2, size * sizeof(uint8_t)) == 0;
+            SkASSERT(match);
+            
+            for (int j = 0; j < 200; j++) {
+                size_t skip = gRand.nextU() % size;
+                size_t write = gRand.nextU() % size;
+                if (skip + write > size) {
+                    write = size - skip;
+                }
+                SkPackBits::Unpack8(src, skip, write, dst);
+                bool match = memcmp(src, src2 + skip, write) == 0;
+                SkASSERT(match);
+            }
+        }
+    }
+}
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() {
+    static bool gOnce;
+    if (!gOnce) {
+//        test_pack8();
+        gOnce = true;
+    }
+    return new TextOnPathView;
+}
+
+static SkViewRegister reg(MyFactory);
+