diff options
Diffstat (limited to 'experimental/SkSetPoly3To3_D.cpp')
-rw-r--r-- | experimental/SkSetPoly3To3_D.cpp | 65 |
1 files changed, 0 insertions, 65 deletions
diff --git a/experimental/SkSetPoly3To3_D.cpp b/experimental/SkSetPoly3To3_D.cpp deleted file mode 100644 index 47c0946..0000000 --- a/experimental/SkSetPoly3To3_D.cpp +++ /dev/null @@ -1,65 +0,0 @@ -#include "SkMatrix.h" - -typedef int64_t SkDScalar; - -static SkScalar SkDScalar_toScalar(SkDScalar value) { - SkDScalar result = (value + (1 << 15)) >> 16; - int top = result >> 31; - SkASSERT(top == 0 || top == -1); - return (SkScalar)result; -} - -static SkDScalar SkDScalar_setMul(SkScalar a, SkScalar b) { - return (SkDScalar)a * b; -} - -static void computeOuterProduct(SkMatrix* matrix, - const SkPoint pts0[3], const SkPoint& ave0, - const SkPoint pts1[3], const SkPoint& ave1) { - SkDScalar tmp[4]; - sk_bzero(tmp, sizeof(tmp)); - - for (int i = 0; i < 3; i++) { - SkScalar x0 = pts0[i].fX - ave0.fX; - SkScalar y0 = pts0[i].fY - ave0.fY; - SkScalar x1 = pts1[i].fX - ave1.fX; - SkScalar y1 = pts1[i].fY - ave1.fY; - tmp[0] += SkDScalar_setMul(x0, x1); - tmp[1] += SkDScalar_setMul(x0, y1); - tmp[2] += SkDScalar_setMul(y0, x1); - tmp[3] += SkDScalar_setMul(y0, y1); - } - matrix->reset(); - matrix->setScaleX(SkDScalar_toScalar(tmp[0])); - matrix->setSkewY( SkDScalar_toScalar(tmp[1])); - matrix->setSkewX( SkDScalar_toScalar(tmp[2])); - matrix->setScaleY(SkDScalar_toScalar(tmp[3])); -} - -static SkScalar dot(SkScalar ax, SkScalar ay, SkScalar bx, SkScalar by) { - return SkDScalar_toScalar(SkDScalar_setMul(ax, bx) + - SkDScalar_setMul(ay, by)); -} - -bool SkSetPoly3To3(SkMatrix* matrix, const SkPoint src[3], const SkPoint dst[3]) { - const SkPoint& srcAve = src[0]; - const SkPoint& dstAve = dst[0]; - - SkMatrix srcOP, dstOP; - - computeOuterProduct(&srcOP, src, srcAve, src, srcAve); - - if (!srcOP.invert(&srcOP)) { - return false; - } - - computeOuterProduct(&dstOP, src, srcAve, dst, dstAve); - - matrix->setConcat(dstOP, srcOP); - matrix->setTranslateX(dstAve.fX - dot(srcAve.fX, srcAve.fY, - matrix->getScaleX(), matrix->getSkewX())); - matrix->setTranslateY(dstAve.fY - dot(srcAve.fX, srcAve.fY, - matrix->getSkewY(), matrix->getScaleY())); - return true; -} - |