ios fixes

skia_ios.mm
Get the app's Documents directory and pass use it to set the resource path.
This is a quick hack which will be replaced by a new application that is
a tiny shim around a command line tool.

SkImageEncoder.h
SkForceLinking.cpp
SkImageDecoder_CG.cpp
Add support for FORCE_LINKING so iOS sees the PNG encoder and others.

SkFloatBits.cpp
SkPoint.cpp
Handle denormalized numbers that are floored by the iOS ARM processor.

SkImageDecoder_iOS.mm
Remove empty encoder factory.

SkTouchGesture.cpp
Return early on empty state on touch rather than aborting (crashing)

JpegTest.cpp
Hal via stackoverflow.com says partial jpegs can be gray as well.

skia_test.cpp
Remove crash handler call for now to avoid link failure.

OverwriteLine.h
Remove fancy line overwrite for iOS.

Resources.cpp
Add interface to set resource directory based on runtime query.

BUG=skia:2736 skia:2737 skia:2738
R=reed@google.com, halcanary@google.com, mtklein@google.com, tfarina@chromium.org

Author: caryclark@google.com

Review URL: https://codereview.chromium.org/373383003

1 files changed, 11 insertions, 0 deletions

diff --git a/src/core/SkPoint.cpp b/src/core/SkPoint.cpp
index 719ee54b22..8a6d0564af 100644
--- a/src/core/SkPoint.cpp
+++ b/src/core/SkPoint.cpp
@@ -7,6 +7,7 @@
  */
 
 
+#include "SkMathPriv.h"
 #include "SkPoint.h"
 
 void SkIPoint::rotateCW(SkIPoint* dst) const {
@@ -168,7 +169,17 @@ bool SkPoint::setLength(float x, float y, float length) {
         // divide by inf. and return (0,0) vector.
         double xx = x;
         double yy = y;
+    #ifdef SK_DISCARD_DENORMALIZED_FOR_SPEED
+        // The iOS ARM processor discards small denormalized numbers to go faster.
+        // Casting this to a float would cause the scale to go to zero. Keeping it
+        // as a double for the multiply keeps the scale non-zero.
+        double dscale = length / sqrt(xx * xx + yy * yy);
+        fX = x * dscale;
+        fY = y * dscale;
+        return true;
+    #else
         scale = (float)(length / sqrt(xx * xx + yy * yy));
+    #endif
     }
     fX = x * scale;
     fY = y * scale;