Use C locale for numerics when emitting shaders.

BUG=skia:3330

Review URL: https://codereview.chromium.org/1012723002

3 files changed, 57 insertions, 0 deletions

diff --git a/include/gpu/GrTypesPriv.h b/include/gpu/GrTypesPriv.h
index 412de897c6..151de1991a 100644
--- a/include/gpu/GrTypesPriv.h
+++ b/include/gpu/GrTypesPriv.h
@@ -264,4 +264,51 @@ private:
     SkIRect fRect;
 };
 
+
+/**
+ * Helper class for ensuring that we don't use the wrong locale when building shaders. Android
+ * doesn't support locale in the NDK, so this is a no-op there.
+ */
+#if !defined(SK_BUILD_FOR_ANDROID)
+#include <locale.h>
+#endif
+
+#if defined(SK_BUILD_FOR_MAC)
+#include <xlocale.h>
+#endif
+
+class GrAutoLocaleSetter {
+public:
+    GrAutoLocaleSetter (const char* name) {
+#if defined(SK_BUILD_FOR_WIN)
+        fOldPerThreadLocale = _configthreadlocale(_ENABLE_PER_THREAD_LOCALE);
+        fOldLocale = setlocale(LC_ALL, name);
+#elif !defined(SK_BUILD_FOR_ANDROID)
+        fLocale = newlocale(LC_ALL, name, 0);
+        fOldLocale = uselocale(fLocale);
+#else
+        (void) name; // suppress unused param warning.
+#endif
+    }
+
+    ~GrAutoLocaleSetter () {
+#if defined(SK_BUILD_FOR_WIN)
+        setlocale(LC_ALL, fOldLocale);
+        _configthreadlocale(fOldPerThreadLocale);
+#elif !defined(SK_BUILD_FOR_ANDROID)
+        SkASSERT(uselocale(fOldLocale) == fLocale);
+        freelocale(fLocale);
+#endif
+    }
+
+private:
+#if defined(SK_BUILD_FOR_WIN)
+    int fOldPerThreadLocale;
+    const char* fOldLocale;
+#elif !defined(SK_BUILD_FOR_ANDROID)
+    locale_t fOldLocale;
+    locale_t fLocale;
+#endif
+};
+
 #endif
diff --git a/src/gpu/gl/builders/GrGLProgramBuilder.cpp b/src/gpu/gl/builders/GrGLProgramBuilder.cpp
index bad1d63ae7..8669d239c7 100644
--- a/src/gpu/gl/builders/GrGLProgramBuilder.cpp
+++ b/src/gpu/gl/builders/GrGLProgramBuilder.cpp
@@ -53,6 +53,8 @@ private:
 const int GrGLProgramBuilder::kVarsPerBlock = 8;
 
 GrGLProgram* GrGLProgramBuilder::CreateProgram(const DrawArgs& args, GrGLGpu* gpu) {
+    GrAutoLocaleSetter als("C");
+
     // create a builder.  This will be handed off to effects so they can use it to add
     // uniforms, varyings, textures, etc
     SkAutoTDelete<GrGLProgramBuilder> builder(CreateProgramBuilder(args, gpu));
diff --git a/tests/GLProgramsTest.cpp b/tests/GLProgramsTest.cpp
index 897e261e5a..d67d1118ed 100644
--- a/tests/GLProgramsTest.cpp
+++ b/tests/GLProgramsTest.cpp
@@ -337,6 +337,14 @@ bool GrDrawTarget::programUnitTest(int maxStages) {
 }
 
 DEF_GPUTEST(GLPrograms, reporter, factory) {
+    // Set a locale that would cause shader compilation to fail because of , as decimal separator.
+    // skbug 3330
+#ifdef SK_BUILD_FOR_WIN
+    GrAutoLocaleSetter als("sv-SE");
+#else
+    GrAutoLocaleSetter als("sv_SE.UTF-8");
+#endif
+
     for (int type = 0; type < GrContextFactory::kLastGLContextType; ++type) {
         GrContext* context = factory->get(static_cast<GrContextFactory::GLContextType>(type));
         if (context) {