Revert "Make SkMatrix44::invert() check for finite 1/det instead of magic value"

This reverts commit f109b4ac6ef21ccb8b76891e50e63dae820af116.

git-svn-id: http://skia.googlecode.com/svn/trunk@10760 2bbb7eff-a529-9590-31e7-b0007b416f81

2 files changed, 3 insertions, 32 deletions

diff --git a/src/utils/SkMatrix44.cpp b/src/utils/SkMatrix44.cpp
index 9ceecbdf2a..92c8715faa 100644
--- a/src/utils/SkMatrix44.cpp
+++ b/src/utils/SkMatrix44.cpp
@@ -529,16 +529,13 @@ bool SkMatrix44::invert(SkMatrix44* inverse) const {
     // Calculate the determinant
     double det = b00 * b11 - b01 * b10 + b02 * b09 + b03 * b08 - b04 * b07 + b05 * b06;
 
-    double invdet = 1.0 / det;
-    // If det is zero, we want to return false. However, we also want to return false
-    // if 1/det overflows to infinity (i.e. det is denormalized). Both of these are
-    // handled by checking that 1/det is finite.
-    if (!sk_float_isfinite(invdet)) {
+    if (dabs(det) < TOO_SMALL_FOR_DETERMINANT) {
         return false;
     }
     if (NULL == inverse) {
         return true;
     }
+    double invdet = 1.0 / det;
 
     b00 *= invdet;
     b01 *= invdet;
@@ -571,6 +568,7 @@ bool SkMatrix44::invert(SkMatrix44* inverse) const {
     inverse->fMat[3][3] = SkDoubleToMScalar(a20 * b03 - a21 * b01 + a22 * b00);
     inverse->dirtyTypeMask();
 
+    inverse->dirtyTypeMask();
     return true;
 }
 
diff --git a/tests/Matrix44Test.cpp b/tests/Matrix44Test.cpp
index 6783ba0275..b2c7071b79 100644
--- a/tests/Matrix44Test.cpp
+++ b/tests/Matrix44Test.cpp
@@ -403,33 +403,6 @@ static void TestMatrix44(skiatest::Reporter* reporter) {
     iden2.setConcat(inverse, mat);
     REPORTER_ASSERT(reporter, is_identity(iden2));
 
-    // test tiny-valued matrix inverse
-    mat.reset();
-    mat.setScale(1.0e-12, 1.0e-12, 1.0e-12);
-    rot.setRotateDegreesAbout(0, 0, -1, 90);
-    mat.postConcat(rot);
-    mat.postTranslate(1.0e-12, 1.0e-12, 1.0e-12);
-    REPORTER_ASSERT(reporter, mat.invert(NULL));
-    mat.invert(&inverse);
-    iden1.setConcat(mat, inverse);
-    REPORTER_ASSERT(reporter, is_identity(iden1));
-    
-    // test mixed-valued matrix inverse
-    mat.reset();
-    mat.setScale(1.0e-12, 3.0, 1.0e+12);
-    rot.setRotateDegreesAbout(0, 0, -1, 90);
-    mat.postConcat(rot);
-    mat.postTranslate(1.0e+12, 3.0, 1.0e-12);
-    REPORTER_ASSERT(reporter, mat.invert(NULL));
-    mat.invert(&inverse);
-    iden1.setConcat(mat, inverse);
-    REPORTER_ASSERT(reporter, is_identity(iden1));
-    
-    // test degenerate matrix
-    mat.reset();
-    mat.set3x3(1.0, 1.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0, 0.0);
-    REPORTER_ASSERT(reporter, !mat.invert(NULL));
-    
     // test rol/col Major getters
     {
         mat.setTranslate(2, 3, 4);