add SkSize for dimensions

git-svn-id: http://skia.googlecode.com/svn/trunk@172 2bbb7eff-a529-9590-31e7-b0007b416f81

Makefile

@@ -110,7 +110,7 @@ TESTS_SRCS := GeometryTest.cpp MathTest.cpp MatrixTest.cpp PackBitsTest.cpp \
               Sk64Test.cpp StringTest.cpp Test.cpp UtilsTest.cpp PathTest.cpp \
               ClipCubicTest.cpp SrcOverTest.cpp StreamTest.cpp SortTest.cpp \
 			  BitmapCopyTest.cpp PathMeasureTest.cpp TriangulationTest.cpp \
-              testmain.cpp
+              TestSize.cpp testmain.cpp
 
 TESTS_SRCS := $(addprefix tests/, $(TESTS_SRCS))
 

include/core/SkSize.h

@@ -0,0 +1,77 @@
+
+
+#ifndef SkSize_DEFINED
+#define SkSize_DEFINED
+
+template <typename T> struct SkTSize {
+    T fWidth;
+    T fHeight;
+
+    void set(T w, T h) {
+        fWidth = w;
+        fHeight = h;
+    }
+
+    /** Returns true if either widht or height are <= 0 */
+    bool isEmpty() const {
+        return fWidth <= 0 || fHeight <= 0;
+    }
+    
+    /** Set the width and height to 0 */
+    void setEmpty() {
+        fWidth = fHeight = 0;
+    }
+    
+    /** If width or height is < 0, it is set to 0 */
+    void clampNegToZero() {
+        if (fWidth < 0) {
+            fWidth = 0;
+        }
+        if (fHeight < 0) {
+            fHeight = 0;
+        }
+    }
+};
+
+template <typename T>
+static inline bool operator==(const SkTSize<T>& a, const SkTSize<T>& b) {
+    return a.fWidth == b.fWidth && a.fHeight == b.fHeight;
+}
+
+template <typename T>
+static inline bool operator!=(const SkTSize<T>& a, const SkTSize<T>& b) {
+    return !(a == b);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+struct SkISize : public SkTSize<int32_t> {};
+
+#include "SkScalar.h"
+
+struct SkSize : public SkTSize<SkScalar> {
+    SkSize& operator=(const SkISize& src) {
+        this->set(SkIntToScalar(src.fWidth), SkIntToScalar(src.fHeight));
+        return *this;
+    }
+
+    SkISize round() const {
+        SkISize s;
+        s.set(SkScalarRound(fWidth), SkScalarRound(fHeight));
+        return s;
+    }
+    
+    SkISize ceil() const {
+        SkISize s;
+        s.set(SkScalarCeil(fWidth), SkScalarCeil(fHeight));
+        return s;
+    }
+
+    SkISize floor() const {
+        SkISize s;
+        s.set(SkScalarFloor(fWidth), SkScalarFloor(fHeight));
+        return s;
+    }
+};
+
+#endif

tests/TestSize.cpp

@@ -0,0 +1,60 @@
+#include "Test.h"
+#include "SkSize.h"
+
+static void TestISize(skiatest::Reporter* reporter) {
+    SkISize  a, b;
+    
+    a.set(0, 0);
+    REPORTER_ASSERT(reporter, a.isEmpty());
+    a.set(5, -5);
+    REPORTER_ASSERT(reporter, a.isEmpty());
+    a.clampNegToZero();
+    REPORTER_ASSERT(reporter, a.isEmpty());
+    b.set(5, 0);
+    REPORTER_ASSERT(reporter, a == b);
+    
+    a.set(3, 5);
+    REPORTER_ASSERT(reporter, !a.isEmpty());
+    b = a;
+    REPORTER_ASSERT(reporter, !b.isEmpty());
+    REPORTER_ASSERT(reporter, a == b);
+    REPORTER_ASSERT(reporter, !(a != b));
+    REPORTER_ASSERT(reporter,
+                    a.fWidth == b.fWidth && a.fHeight == b.fHeight);
+}
+
+static void TestSize(skiatest::Reporter* reporter) {
+    TestISize(reporter);
+    
+    SkSize a, b;
+    int ix = 5;
+    int iy = 3;
+    SkScalar x = SkIntToScalar(ix);
+    SkScalar y = SkIntToScalar(iy);
+    
+    a.set(0, 0);
+    REPORTER_ASSERT(reporter, a.isEmpty());
+    a.set(x, -x);
+    REPORTER_ASSERT(reporter, a.isEmpty());
+    a.clampNegToZero();
+    REPORTER_ASSERT(reporter, a.isEmpty());
+    b.set(x, 0);
+    REPORTER_ASSERT(reporter, a == b);
+    
+    a.set(y, x);
+    REPORTER_ASSERT(reporter, !a.isEmpty());
+    b = a;
+    REPORTER_ASSERT(reporter, !b.isEmpty());
+    REPORTER_ASSERT(reporter, a == b);
+    REPORTER_ASSERT(reporter, !(a != b));
+    REPORTER_ASSERT(reporter,
+                    a.fWidth == b.fWidth && a.fHeight == b.fHeight);
+    
+    SkISize ia;
+    ia.set(ix, iy);
+    a.set(x, y);
+    REPORTER_ASSERT(reporter, a.round() == ia);
+};
+
+#include "TestClassDef.h"
+DEFINE_TESTCLASS("Size", TestSizeClass, TestSize)