optimize translate and scale
add map2() to optimize for mapping an array of 2D points into homogeneous 4-vector
Review URL: https://codereview.appspot.com/6874064
git-svn-id: http://skia.googlecode.com/svn/trunk@6685 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/utils/SkMatrix44.h b/include/utils/SkMatrix44.h
index f63f0df..565fcf5 100644
--- a/include/utils/SkMatrix44.h
+++ b/include/utils/SkMatrix44.h
@@ -37,7 +37,7 @@
#endif
typedef float SkMScalar;
typedef int32_t SkMIntScalar;
-
+
static inline float SkFloatToMScalar(float x) {
return x;
}
@@ -134,7 +134,7 @@
kAffine_Mask = 0x04, //!< set if the matrix skews or rotates
kPerspective_Mask = 0x08 //!< set if the matrix is in perspective
};
-
+
/**
* Returns a bitfield describing the transformations the matrix may
* perform. The bitfield is computed conservatively, so it may include
@@ -153,7 +153,7 @@
inline bool isIdentity() const {
return 0 == this->getType();
}
-
+
void setIdentity();
inline void reset() { this->setIdentity();}
@@ -309,6 +309,17 @@
return dst;
}
+ /**
+ * map an array of [x, y, 0, 1] through the matrix, returning an array
+ * of [x', y', z', w'].
+ *
+ * @param src2 array of [x, y] pairs, with implied z=0 and w=1
+ * @param count number of [x, y] pairs in src2
+ * @param dst4 array of [x', y', z', w'] quads as the output.
+ */
+ void map2(const float src2[], int count, float dst4[]) const;
+ void map2(const double src2[], int count, double dst4[]) const;
+
void dump() const;
double determinant() const;
@@ -319,7 +330,7 @@
// we are always packed with no extra bits, allowing us to call memcpy
// without fear of copying uninitialized bits.
mutable SkMIntScalar fTypeMask;
-
+
enum {
kUnknown_Mask = 0x80,
@@ -333,7 +344,7 @@
SkMScalar scaleX() const { return fMat[0][0]; }
SkMScalar scaleY() const { return fMat[1][1]; }
SkMScalar scaleZ() const { return fMat[2][2]; }
-
+
SkMScalar perspX() const { return fMat[0][3]; }
SkMScalar perspY() const { return fMat[1][3]; }
SkMScalar perspZ() const { return fMat[2][3]; }