Fix build warnings in SkAlphaThresholdFilter

BUG=None
R=bsalomon@google.com

Author: zork@chromium.org

Review URL: https://codereview.chromium.org/101763010

git-svn-id: http://skia.googlecode.com/svn/trunk@12937 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/imagealphathreshold.cpp b/gm/imagealphathreshold.cpp
index 2839744..7597090 100644
--- a/gm/imagealphathreshold.cpp
+++ b/gm/imagealphathreshold.cpp
@@ -43,7 +43,7 @@
         SkMatrix matrix;
         matrix.reset();
         matrix.setTranslate(WIDTH * .1f, HEIGHT * .1f);
-        matrix.postScale(.8, .8);
+        matrix.postScale(.8f, .8f);
 
         canvas->concat(matrix);
 
diff --git a/src/effects/SkAlphaThresholdFilter.cpp b/src/effects/SkAlphaThresholdFilter.cpp
index a53731f..f15a13d 100644
--- a/src/effects/SkAlphaThresholdFilter.cpp
+++ b/src/effects/SkAlphaThresholdFilter.cpp
@@ -308,18 +308,18 @@
     SkASSERT(src.config() == SkBitmap::kARGB_8888_Config);
 
     if (src.config() != SkBitmap::kARGB_8888_Config) {
-      return false;
+        return false;
     }
 
     SkMatrix localInverse;
     if (!matrix.invert(&localInverse)) {
-        return NULL;
+        return false;
     }
 
     SkAutoLockPixels alp(src);
     SkASSERT(src.getPixels());
     if (!src.getPixels() || src.width() <= 0 || src.height() <= 0) {
-      return false;
+        return false;
     }
 
     dst->setConfig(src.config(), src.width(), src.height());
@@ -328,8 +328,8 @@
         return false;
     }
 
-    U8CPU innerThreshold = fInnerThreshold * 0xFF;
-    U8CPU outerThreshold = fOuterThreshold * 0xFF;
+    U8CPU innerThreshold = (U8CPU)(fInnerThreshold * 0xFF);
+    U8CPU outerThreshold = (U8CPU)(fOuterThreshold * 0xFF);
     SkColor* sptr = src.getAddr32(0, 0);
     SkColor* dptr = dst->getAddr32(0, 0);
     int width = src.width(), height = src.height();
@@ -338,25 +338,25 @@
             const SkColor& source = sptr[y * width + x];
             SkColor output_color(source);
             SkPoint position;
-            localInverse.mapXY(x, y, &position);
-            if (fRegion.contains(position.x(), position.y())) {
+            localInverse.mapXY((SkScalar)x, (SkScalar)y, &position);
+            if (fRegion.contains((int32_t)position.x(), (int32_t)position.y())) {
                 if (SkColorGetA(source) < innerThreshold) {
                     U8CPU alpha = SkColorGetA(source);
                     if (alpha == 0)
                         alpha = 1;
                     float scale = (float)innerThreshold / alpha;
                     output_color = SkColorSetARGB(innerThreshold,
-                                                  SkColorGetR(source) * scale,
-                                                  SkColorGetG(source) * scale,
-                                                  SkColorGetB(source) * scale);
+                                                  (U8CPU)(SkColorGetR(source) * scale),
+                                                  (U8CPU)(SkColorGetG(source) * scale),
+                                                  (U8CPU)(SkColorGetB(source) * scale));
                 }
             } else {
                 if (SkColorGetA(source) > outerThreshold) {
                     float scale = (float)outerThreshold / SkColorGetA(source);
                     output_color = SkColorSetARGB(outerThreshold,
-                                                  SkColorGetR(source) * scale,
-                                                  SkColorGetG(source) * scale,
-                                                  SkColorGetB(source) * scale);
+                                                  (U8CPU)(SkColorGetR(source) * scale),
+                                                  (U8CPU)(SkColorGetG(source) * scale),
+                                                  (U8CPU)(SkColorGetB(source) * scale));
                 }
             }
             dptr[y * dst->width() + x] = output_color;
diff --git a/tests/GLProgramsTest.cpp b/tests/GLProgramsTest.cpp
index a1dbea8..7e55cc7 100644
--- a/tests/GLProgramsTest.cpp
+++ b/tests/GLProgramsTest.cpp
@@ -260,7 +260,7 @@
 
 void forceLinking() {
     SkLightingImageFilter::CreateDistantLitDiffuse(SkPoint3(0,0,0), 0, 0, 0);
-    SkAlphaThresholdFilter::Create(SkRegion(), .5, .5);
+    SkAlphaThresholdFilter::Create(SkRegion(), .5f, .5f);
     SkMagnifierImageFilter mag(SkRect::MakeWH(SK_Scalar1, SK_Scalar1), SK_Scalar1);
     GrConfigConversionEffect::Create(NULL,
                                      false,