diff --git a/include/utils/Compat.h b/include/utils/Compat.h
index 1819266..fb7748e 100644
--- a/include/utils/Compat.h
+++ b/include/utils/Compat.h
@@ -39,4 +39,27 @@
 
 #endif /* !HAVE_OFF64_T */
 
+#if HAVE_PRINTF_ZD
+#  define ZD "%zd"
+#  define ZD_TYPE ssize_t
+#else
+#  define ZD "%ld"
+#  define ZD_TYPE long
+#endif
+
+/*
+ * TEMP_FAILURE_RETRY is defined by some, but not all, versions of
+ * <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's
+ * not already defined, then define it here.
+ */
+#ifndef TEMP_FAILURE_RETRY
+/* Used to retry syscalls that can return EINTR. */
+#define TEMP_FAILURE_RETRY(exp) ({         \
+    typeof (exp) _rc;                      \
+    do {                                   \
+        _rc = (exp);                       \
+    } while (_rc == -1 && errno == EINTR); \
+    _rc; })
+#endif
+
 #endif /* __LIB_UTILS_COMPAT_H */
diff --git a/include/utils/Vector.h b/include/utils/Vector.h
index 7927328..f3020d6 100644
--- a/include/utils/Vector.h
+++ b/include/utils/Vector.h
@@ -188,7 +188,8 @@
      inline void push_back(const TYPE& item)  { insertAt(item, size(), 1); }
      inline void push_front(const TYPE& item) { insertAt(item, 0, 1); }
      inline iterator erase(iterator pos) {
-         return begin() + removeItemsAt(pos-array());
+         ssize_t index = removeItemsAt(pos-array());
+         return begin() + index;
      }
 
 protected:
diff --git a/libs/utils/ZipFileRO.cpp b/libs/utils/ZipFileRO.cpp
index ef49c0f..a1bfedb 100644
--- a/libs/utils/ZipFileRO.cpp
+++ b/libs/utils/ZipFileRO.cpp
@@ -20,6 +20,7 @@
 #define LOG_TAG "zipro"
 //#define LOG_NDEBUG 0
 #include <utils/Log.h>
+#include <utils/Compat.h>
 #include <utils/ZipFileRO.h>
 #include <utils/misc.h>
 #include <utils/threads.h>
@@ -32,14 +33,6 @@
 #include <assert.h>
 #include <unistd.h>
 
-#if HAVE_PRINTF_ZD
-#  define ZD "%zd"
-#  define ZD_TYPE ssize_t
-#else
-#  define ZD "%ld"
-#  define ZD_TYPE long
-#endif
-
 /*
  * We must open binary files using open(path, ... | O_BINARY) under Windows.
  * Otherwise strange read errors will happen.
@@ -48,21 +41,6 @@
 #  define O_BINARY  0
 #endif
 
-/*
- * TEMP_FAILURE_RETRY is defined by some, but not all, versions of
- * <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's
- * not already defined, then define it here.
- */
-#ifndef TEMP_FAILURE_RETRY
-/* Used to retry syscalls that can return EINTR. */
-#define TEMP_FAILURE_RETRY(exp) ({         \
-    typeof (exp) _rc;                      \
-    do {                                   \
-        _rc = (exp);                       \
-    } while (_rc == -1 && errno == EINTR); \
-    _rc; })
-#endif
-
 using namespace android;
 
 /*
diff --git a/libs/utils/ZipUtils.cpp b/libs/utils/ZipUtils.cpp
index cf5467b..a43bbb0 100644
--- a/libs/utils/ZipUtils.cpp
+++ b/libs/utils/ZipUtils.cpp
@@ -21,6 +21,7 @@
 #define LOG_TAG "ziputil"
 
 #include <utils/Log.h>
+#include <utils/Compat.h>
 #include <utils/ZipUtils.h>
 #include <utils/ZipFileRO.h>
 
@@ -98,10 +99,11 @@
             ALOGV("+++ reading %ld bytes (%ld left)\n",
                 getSize, compRemaining);
 
-            int cc = read(fd, readBuf, getSize);
-            if (cc != (int) getSize) {
-                ALOGD("inflate read failed (%d vs %ld)\n",
-                    cc, getSize);
+            int cc = TEMP_FAILURE_RETRY(read(fd, readBuf, getSize));
+            if (cc < 0) {
+                ALOGW("inflate read failed: %s", strerror(errno));
+            } else if (cc != (int) getSize) {
+                ALOGW("inflate read failed (%d vs %ld)", cc, getSize);
                 goto z_bail;
             }
 
diff --git a/libs/utils/tests/Android.mk b/libs/utils/tests/Android.mk
index 0a5b379..5b2b5b1 100644
--- a/libs/utils/tests/Android.mk
+++ b/libs/utils/tests/Android.mk
@@ -4,42 +4,30 @@
 
 # Build the unit tests.
 test_src_files := \
-	BasicHashtable_test.cpp \
-	BlobCache_test.cpp \
-	Looper_test.cpp \
-	String8_test.cpp \
-	Unicode_test.cpp \
-	Vector_test.cpp \
-	ZipFileRO_test.cpp
+    BasicHashtable_test.cpp \
+    BlobCache_test.cpp \
+    Looper_test.cpp \
+    String8_test.cpp \
+    Unicode_test.cpp \
+    Vector_test.cpp \
+    ZipFileRO_test.cpp
 
 shared_libraries := \
-	libz \
-	liblog \
-	libcutils \
-	libutils \
-	libstlport
+    libz \
+    liblog \
+    libcutils \
+    libutils \
+    libstlport
 
 static_libraries := \
-	libgtest \
-	libgtest_main
-
-c_includes := \
-    external/zlib \
-    external/icu4c/common \
-    bionic \
-    bionic/libstdc++/include \
-    external/gtest/include \
-    external/stlport/stlport
-
-module_tags := eng tests
+    libgtest \
+    libgtest_main
 
 $(foreach file,$(test_src_files), \
     $(eval include $(CLEAR_VARS)) \
     $(eval LOCAL_SHARED_LIBRARIES := $(shared_libraries)) \
     $(eval LOCAL_STATIC_LIBRARIES := $(static_libraries)) \
-    $(eval LOCAL_C_INCLUDES := $(c_includes)) \
     $(eval LOCAL_SRC_FILES := $(file)) \
     $(eval LOCAL_MODULE := $(notdir $(file:%.cpp=%))) \
-    $(eval LOCAL_MODULE_TAGS := $(module_tags)) \
-    $(eval include $(BUILD_EXECUTABLE)) \
+    $(eval include $(BUILD_NATIVE_TEST)) \
 )
diff --git a/opengl/include/GLES2/gl2.h b/opengl/include/GLES2/gl2.h
index e1d3b87..c139c25 100644
--- a/opengl/include/GLES2/gl2.h
+++ b/opengl/include/GLES2/gl2.h
@@ -528,7 +528,7 @@
 GL_APICALL void         GL_APIENTRY glGetActiveAttrib (GLuint program, GLuint index, GLsizei bufsize, GLsizei* length, GLint* size, GLenum* type, GLchar* name);
 GL_APICALL void         GL_APIENTRY glGetActiveUniform (GLuint program, GLuint index, GLsizei bufsize, GLsizei* length, GLint* size, GLenum* type, GLchar* name);
 GL_APICALL void         GL_APIENTRY glGetAttachedShaders (GLuint program, GLsizei maxcount, GLsizei* count, GLuint* shaders);
-GL_APICALL int          GL_APIENTRY glGetAttribLocation (GLuint program, const GLchar* name);
+GL_APICALL GLint        GL_APIENTRY glGetAttribLocation (GLuint program, const GLchar* name);
 GL_APICALL void         GL_APIENTRY glGetBooleanv (GLenum pname, GLboolean* params);
 GL_APICALL void         GL_APIENTRY glGetBufferParameteriv (GLenum target, GLenum pname, GLint* params);
 GL_APICALL GLenum       GL_APIENTRY glGetError (void);
@@ -547,7 +547,7 @@
 GL_APICALL void         GL_APIENTRY glGetTexParameteriv (GLenum target, GLenum pname, GLint* params);
 GL_APICALL void         GL_APIENTRY glGetUniformfv (GLuint program, GLint location, GLfloat* params);
 GL_APICALL void         GL_APIENTRY glGetUniformiv (GLuint program, GLint location, GLint* params);
-GL_APICALL int          GL_APIENTRY glGetUniformLocation (GLuint program, const GLchar* name);
+GL_APICALL GLint        GL_APIENTRY glGetUniformLocation (GLuint program, const GLchar* name);
 GL_APICALL void         GL_APIENTRY glGetVertexAttribfv (GLuint index, GLenum pname, GLfloat* params);
 GL_APICALL void         GL_APIENTRY glGetVertexAttribiv (GLuint index, GLenum pname, GLint* params);
 GL_APICALL void         GL_APIENTRY glGetVertexAttribPointerv (GLuint index, GLenum pname, GLvoid** pointer);
diff --git a/opengl/libs/EGL/eglApi.cpp b/opengl/libs/EGL/eglApi.cpp
index 23e89da..4e44941 100644
--- a/opengl/libs/EGL/eglApi.cpp
+++ b/opengl/libs/EGL/eglApi.cpp
@@ -1171,11 +1171,12 @@
     const egl_display_ptr dp = validate_display(dpy);
     if (!dp) return EGL_FALSE;
 
+    EGLBoolean result = EGL_FALSE;
     egl_connection_t* const cnx = &gEGLImpl;
     if (cnx->dso && cnx->egl.eglDestroyImageKHR) {
-        cnx->egl.eglDestroyImageKHR(dp->disp.dpy, img);
+        result = cnx->egl.eglDestroyImageKHR(dp->disp.dpy, img);
     }
-    return EGL_TRUE;
+    return result;
 }
 
 // ----------------------------------------------------------------------------
diff --git a/opengl/libs/GLES2/gl2_api.in b/opengl/libs/GLES2/gl2_api.in
index 9a89a52..cccf46c 100644
--- a/opengl/libs/GLES2/gl2_api.in
+++ b/opengl/libs/GLES2/gl2_api.in
@@ -169,7 +169,7 @@
 void API_ENTRY(glGetAttachedShaders)(GLuint program, GLsizei maxcount, GLsizei* count, GLuint* shaders) {
     CALL_GL_API(glGetAttachedShaders, program, maxcount, count, shaders);
 }
-int API_ENTRY(glGetAttribLocation)(GLuint program, const GLchar* name) {
+GLint API_ENTRY(glGetAttribLocation)(GLuint program, const GLchar* name) {
     CALL_GL_API_RETURN(glGetAttribLocation, program, name);
 }
 void API_ENTRY(glGetBooleanv)(GLenum pname, GLboolean* params) {
@@ -226,7 +226,7 @@
 void API_ENTRY(glGetUniformiv)(GLuint program, GLint location, GLint* params) {
     CALL_GL_API(glGetUniformiv, program, location, params);
 }
-int API_ENTRY(glGetUniformLocation)(GLuint program, const GLchar* name) {
+GLint API_ENTRY(glGetUniformLocation)(GLuint program, const GLchar* name) {
     CALL_GL_API_RETURN(glGetUniformLocation, program, name);
 }
 void API_ENTRY(glGetVertexAttribfv)(GLuint index, GLenum pname, GLfloat* params) {
diff --git a/opengl/libs/GLES_trace/src/gltrace_api.cpp b/opengl/libs/GLES_trace/src/gltrace_api.cpp
index cef6cbb..2ae4b11 100644
--- a/opengl/libs/GLES_trace/src/gltrace_api.cpp
+++ b/opengl/libs/GLES_trace/src/gltrace_api.cpp
@@ -2214,7 +2214,7 @@
     glContext->traceGLMessage(&glmsg);
 }
 
-int GLTrace_glGetAttribLocation(GLuint program, const GLchar* name) {
+GLint GLTrace_glGetAttribLocation(GLuint program, const GLchar* name) {
     GLMessage glmsg;
     GLTraceContext *glContext = getGLTraceContext();
 
@@ -2235,7 +2235,7 @@
     // call function
     nsecs_t wallStartTime = systemTime(SYSTEM_TIME_MONOTONIC);
     nsecs_t threadStartTime = systemTime(SYSTEM_TIME_THREAD);
-    int retValue = glContext->hooks->gl.glGetAttribLocation(program, name);
+    GLint retValue = glContext->hooks->gl.glGetAttribLocation(program, name);
     nsecs_t threadEndTime = systemTime(SYSTEM_TIME_THREAD);
     nsecs_t wallEndTime = systemTime(SYSTEM_TIME_MONOTONIC);
 
@@ -2996,7 +2996,7 @@
     glContext->traceGLMessage(&glmsg);
 }
 
-int GLTrace_glGetUniformLocation(GLuint program, const GLchar* name) {
+GLint GLTrace_glGetUniformLocation(GLuint program, const GLchar* name) {
     GLMessage glmsg;
     GLTraceContext *glContext = getGLTraceContext();
 
@@ -3017,7 +3017,7 @@
     // call function
     nsecs_t wallStartTime = systemTime(SYSTEM_TIME_MONOTONIC);
     nsecs_t threadStartTime = systemTime(SYSTEM_TIME_THREAD);
-    int retValue = glContext->hooks->gl.glGetUniformLocation(program, name);
+    GLint retValue = glContext->hooks->gl.glGetUniformLocation(program, name);
     nsecs_t threadEndTime = systemTime(SYSTEM_TIME_THREAD);
     nsecs_t wallEndTime = systemTime(SYSTEM_TIME_MONOTONIC);
 
diff --git a/opengl/libs/GLES_trace/src/gltrace_api.h b/opengl/libs/GLES_trace/src/gltrace_api.h
index debcac0..309afcb 100644
--- a/opengl/libs/GLES_trace/src/gltrace_api.h
+++ b/opengl/libs/GLES_trace/src/gltrace_api.h
@@ -78,7 +78,7 @@
 void GLTrace_glGetActiveAttrib(GLuint program, GLuint index, GLsizei bufsize, GLsizei* length, GLint* size, GLenum* type, GLchar* name);
 void GLTrace_glGetActiveUniform(GLuint program, GLuint index, GLsizei bufsize, GLsizei* length, GLint* size, GLenum* type, GLchar* name);
 void GLTrace_glGetAttachedShaders(GLuint program, GLsizei maxcount, GLsizei* count, GLuint* shaders);
-int GLTrace_glGetAttribLocation(GLuint program, const GLchar* name);
+GLint GLTrace_glGetAttribLocation(GLuint program, const GLchar* name);
 void GLTrace_glGetBooleanv(GLenum pname, GLboolean* params);
 void GLTrace_glGetBufferParameteriv(GLenum target, GLenum pname, GLint* params);
 GLenum GLTrace_glGetError(void);
@@ -97,7 +97,7 @@
 void GLTrace_glGetTexParameteriv(GLenum target, GLenum pname, GLint* params);
 void GLTrace_glGetUniformfv(GLuint program, GLint location, GLfloat* params);
 void GLTrace_glGetUniformiv(GLuint program, GLint location, GLint* params);
-int GLTrace_glGetUniformLocation(GLuint program, const GLchar* name);
+GLint GLTrace_glGetUniformLocation(GLuint program, const GLchar* name);
 void GLTrace_glGetVertexAttribfv(GLuint index, GLenum pname, GLfloat* params);
 void GLTrace_glGetVertexAttribiv(GLuint index, GLenum pname, GLint* params);
 void GLTrace_glGetVertexAttribPointerv(GLuint index, GLenum pname, GLvoid** pointer);
diff --git a/opengl/libs/GLES_trace/src/gltrace_fixup.cpp b/opengl/libs/GLES_trace/src/gltrace_fixup.cpp
index 1bd790e..36ae314 100644
--- a/opengl/libs/GLES_trace/src/gltrace_fixup.cpp
+++ b/opengl/libs/GLES_trace/src/gltrace_fixup.cpp
@@ -341,7 +341,7 @@
 /** Given a glGetActive[Uniform|Attrib] call, obtain the location
  *  of the variable of given name in the call.
  */
-int getShaderVariableLocation(GLTraceContext *context, GLMessage *glmsg, GLchar *name) {
+GLint getShaderVariableLocation(GLTraceContext *context, GLMessage *glmsg, GLchar *name) {
     GLMessage_Function func = glmsg->function();
     if (func != GLMessage::glGetActiveAttrib && func != GLMessage::glGetActiveUniform) {
         return -1;
@@ -374,7 +374,7 @@
     // In order to make things simpler for the debugger, we also pass
     // a hidden location argument that stores the actual location.
     // append the location value to the end of the argument list
-    int location = getShaderVariableLocation(context, glmsg, (GLchar*)pointersToFixup[3]);
+    GLint location = getShaderVariableLocation(context, glmsg, (GLchar*)pointersToFixup[3]);
     GLMessage_DataType *arg_location = glmsg->add_args();
     arg_location->set_isarray(false);
     arg_location->set_type(GLMessage::DataType::INT);
diff --git a/opengl/libs/entries.in b/opengl/libs/entries.in
index 6316d78..b9a51a4 100644
--- a/opengl/libs/entries.in
+++ b/opengl/libs/entries.in
@@ -160,7 +160,7 @@
 GL_ENTRY(void, glGetActiveAttrib, GLuint program, GLuint index, GLsizei bufsize, GLsizei* length, GLint* size, GLenum* type, GLchar* name)
 GL_ENTRY(void, glGetActiveUniform, GLuint program, GLuint index, GLsizei bufsize, GLsizei* length, GLint* size, GLenum* type, GLchar* name)
 GL_ENTRY(void, glGetAttachedShaders, GLuint program, GLsizei maxcount, GLsizei* count, GLuint* shaders)
-GL_ENTRY(int, glGetAttribLocation, GLuint program, const GLchar* name)
+GL_ENTRY(GLint, glGetAttribLocation, GLuint program, const GLchar* name)
 GL_ENTRY(void, glGetBooleanv, GLenum pname, GLboolean *params)
 GL_ENTRY(void, glGetBufferParameteriv, GLenum target, GLenum pname, GLint *params)
 GL_ENTRY(void, glGetBufferPointervOES, GLenum target, GLenum pname, GLvoid ** params)
@@ -218,7 +218,7 @@
 GL_ENTRY(void, glGetTexParameteriv, GLenum target, GLenum pname, GLint *params)
 GL_ENTRY(void, glGetTexParameterxv, GLenum target, GLenum pname, GLfixed *params)
 GL_ENTRY(void, glGetTexParameterxvOES, GLenum target, GLenum pname, GLfixed *params)
-GL_ENTRY(int, glGetUniformLocation, GLuint program, const GLchar* name)
+GL_ENTRY(GLint, glGetUniformLocation, GLuint program, const GLchar* name)
 GL_ENTRY(void, glGetUniformfv, GLuint program, GLint location, GLfloat* params)
 GL_ENTRY(void, glGetUniformiv, GLuint program, GLint location, GLint* params)
 GL_ENTRY(void, glGetVertexAttribPointerv, GLuint index, GLenum pname, GLvoid** pointer)
diff --git a/opengl/libs/trace.in b/opengl/libs/trace.in
index a5c5c84..e89e456 100644
--- a/opengl/libs/trace.in
+++ b/opengl/libs/trace.in
@@ -160,7 +160,7 @@
 TRACE_GL_VOID(glGetActiveAttrib, (GLuint program, GLuint index, GLsizei bufsize, GLsizei* length, GLint* size, GLenum* type, GLchar* name), (program, index, bufsize, length, size, type, name), 7, "GLuint", program, "GLuint", index, "GLsizei", bufsize, "GLsizei*", length, "GLint*", size, "GLenum*", type, "GLchar*", name)
 TRACE_GL_VOID(glGetActiveUniform, (GLuint program, GLuint index, GLsizei bufsize, GLsizei* length, GLint* size, GLenum* type, GLchar* name), (program, index, bufsize, length, size, type, name), 7, "GLuint", program, "GLuint", index, "GLsizei", bufsize, "GLsizei*", length, "GLint*", size, "GLenum*", type, "GLchar*", name)
 TRACE_GL_VOID(glGetAttachedShaders, (GLuint program, GLsizei maxcount, GLsizei* count, GLuint* shaders), (program, maxcount, count, shaders), 4, "GLuint", program, "GLsizei", maxcount, "GLsizei*", count, "GLuint*", shaders)
-TRACE_GL(int, glGetAttribLocation, (GLuint program, const GLchar* name), (program, name), 2, "GLuint", program, "const GLchar*", name)
+TRACE_GL(GLint, glGetAttribLocation, (GLuint program, const GLchar* name), (program, name), 2, "GLuint", program, "const GLchar*", name)
 TRACE_GL_VOID(glGetBooleanv, (GLenum pname, GLboolean *params), (pname, params), 2, "GLenum", pname, "GLboolean *", params)
 TRACE_GL_VOID(glGetBufferParameteriv, (GLenum target, GLenum pname, GLint *params), (target, pname, params), 3, "GLenum", target, "GLenum", pname, "GLint *", params)
 TRACE_GL_VOID(glGetBufferPointervOES, (GLenum target, GLenum pname, GLvoid ** params), (target, pname, params), 3, "GLenum", target, "GLenum", pname, "GLvoid **", params)
@@ -218,7 +218,7 @@
 TRACE_GL_VOID(glGetTexParameteriv, (GLenum target, GLenum pname, GLint *params), (target, pname, params), 3, "GLenum", target, "GLenum", pname, "GLint *", params)
 TRACE_GL_VOID(glGetTexParameterxv, (GLenum target, GLenum pname, GLfixed *params), (target, pname, params), 3, "GLenum", target, "GLenum", pname, "GLfixed *", params)
 TRACE_GL_VOID(glGetTexParameterxvOES, (GLenum target, GLenum pname, GLfixed *params), (target, pname, params), 3, "GLenum", target, "GLenum", pname, "GLfixed *", params)
-TRACE_GL(int, glGetUniformLocation, (GLuint program, const GLchar* name), (program, name), 2, "GLuint", program, "const GLchar*", name)
+TRACE_GL(GLint, glGetUniformLocation, (GLuint program, const GLchar* name), (program, name), 2, "GLuint", program, "const GLchar*", name)
 TRACE_GL_VOID(glGetUniformfv, (GLuint program, GLint location, GLfloat* params), (program, location, params), 3, "GLuint", program, "GLint", location, "GLfloat*", params)
 TRACE_GL_VOID(glGetUniformiv, (GLuint program, GLint location, GLint* params), (program, location, params), 3, "GLuint", program, "GLint", location, "GLint*", params)
 TRACE_GL_VOID(glGetVertexAttribPointerv, (GLuint index, GLenum pname, GLvoid** pointer), (index, pname, pointer), 3, "GLuint", index, "GLenum", pname, "GLvoid**", pointer)
diff --git a/opengl/tests/gl_perf/fill_common.cpp b/opengl/tests/gl_perf/fill_common.cpp
index 389381f..fefedc0 100644
--- a/opengl/tests/gl_perf/fill_common.cpp
+++ b/opengl/tests/gl_perf/fill_common.cpp
@@ -189,7 +189,7 @@
 }
 
 static void randUniform(int pgm, const char *var) {
-    int loc = glGetUniformLocation(pgm, var);
+    GLint loc = glGetUniformLocation(pgm, var);
     if (loc >= 0) {
         float x = ((float)rand()) / RAND_MAX;
         float y = ((float)rand()) / RAND_MAX;
@@ -211,7 +211,7 @@
     startTimer();
     glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
     for (uint32_t ct=0; ct < passCount; ct++) {
-        int loc = glGetUniformLocation(pgm, "u_texOff");
+        GLint loc = glGetUniformLocation(pgm, "u_texOff");
         glUniform2f(loc, ((float)ct) / passCount, ((float)ct) / 2.f / passCount);
 
         randUniform(pgm, "u_color");
@@ -271,7 +271,7 @@
         printf("error running test\n");
         return;
     }
-    int loc = glGetUniformLocation(pgm, "u_tex0");
+    GLint loc = glGetUniformLocation(pgm, "u_tex0");
     if (loc >= 0) glUniform1i(loc, 0);
     loc = glGetUniformLocation(pgm, "u_tex1");
     if (loc >= 0) glUniform1i(loc, 1);
diff --git a/opengl/tools/glgen/specs/gles11/GLES20.spec b/opengl/tools/glgen/specs/gles11/GLES20.spec
index ee88f59..dda746e 100644
--- a/opengl/tools/glgen/specs/gles11/GLES20.spec
+++ b/opengl/tools/glgen/specs/gles11/GLES20.spec
@@ -56,7 +56,7 @@
 void glGetActiveAttrib ( GLuint program, GLuint index, GLsizei bufsize, GLsizei *length, GLint *size, GLenum *type, char *name )
 void glGetActiveUniform ( GLuint program, GLuint index, GLsizei bufsize, GLsizei *length, GLint *size, GLenum *type, char *name )
 void glGetAttachedShaders ( GLuint program, GLsizei maxcount, GLsizei *count, GLuint *shaders )
-int glGetAttribLocation ( GLuint program, const char *name )
+GLint glGetAttribLocation ( GLuint program, const char *name )
 void glGetBooleanv ( GLenum pname, GLboolean *params )
 void glGetBufferParameteriv ( GLenum target, GLenum pname, GLint *params )
 GLenum glGetError ( void )
@@ -75,7 +75,7 @@
 void glGetTexParameteriv ( GLenum target, GLenum pname, GLint *params )
 void glGetUniformfv ( GLuint program, GLint location, GLfloat *params )
 void glGetUniformiv ( GLuint program, GLint location, GLint *params )
-int glGetUniformLocation ( GLuint program, const char *name )
+GLint glGetUniformLocation ( GLuint program, const char *name )
 void glGetVertexAttribfv ( GLuint index, GLenum pname, GLfloat *params )
 void glGetVertexAttribiv ( GLuint index, GLenum pname, GLint *params )
 // void glGetVertexAttribPointerv ( GLuint index, GLenum pname, void **pointer )
diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index 064f689..7edbdc5 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -110,7 +110,8 @@
     mSurfaceTexture->setDefaultMaxBufferCount(3);
 #endif
 
-    updateTransformHint();
+    const sp<const DisplayDevice> hw(mFlinger->getDefaultDisplayDevice());
+    updateTransformHint(hw);
 }
 
 Layer::~Layer()
@@ -767,15 +768,12 @@
     return usage;
 }
 
-void Layer::updateTransformHint() const {
+void Layer::updateTransformHint(const sp<const DisplayDevice>& hw) const {
     uint32_t orientation = 0;
     if (!mFlinger->mDebugDisableTransformHint) {
-        // The transform hint is used to improve performance on the main
-        // display -- we can only have a single transform hint, it cannot
+        // The transform hint is used to improve performance, but we can
+        // only have a single transform hint, it cannot
         // apply to all displays.
-        // This is why we use the default display here. This is not an
-        // oversight.
-        sp<const DisplayDevice> hw(mFlinger->getDefaultDisplayDevice());
         const Transform& planeTransform(hw->getTransform());
         orientation = planeTransform.getOrientation();
         if (orientation & Transform::ROT_INVALID) {
diff --git a/services/surfaceflinger/Layer.h b/services/surfaceflinger/Layer.h
index 6f75d8c..c5eb26b 100644
--- a/services/surfaceflinger/Layer.h
+++ b/services/surfaceflinger/Layer.h
@@ -91,8 +91,8 @@
     inline const sp<GraphicBuffer>& getActiveBuffer() const { return mActiveBuffer; }
 
     // Updates the transform hint in our SurfaceTexture to match
-    // the current orientation of the default display device.
-    virtual void updateTransformHint() const;
+    // the current orientation of the display device.
+    virtual void updateTransformHint(const sp<const DisplayDevice>& hw) const;
 
 protected:
     virtual void onFirstRef();
diff --git a/services/surfaceflinger/LayerBase.h b/services/surfaceflinger/LayerBase.h
index 00c4ffe..4d5a5b0 100644
--- a/services/surfaceflinger/LayerBase.h
+++ b/services/surfaceflinger/LayerBase.h
@@ -246,7 +246,7 @@
      * Updates the SurfaceTexture's transform hint, for layers that have
      * a SurfaceTexture.
      */
-    virtual void updateTransformHint() const { }
+    virtual void updateTransformHint(const sp<const DisplayDevice>& hw) const { }
 
     /** always call base class first */
     virtual void dump(String8& result, char* scratch, size_t size) const;
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index ce10c78..9afa4c1 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -191,12 +191,22 @@
     return token;
 }
 
+void SurfaceFlinger::createBuiltinDisplayLocked(DisplayDevice::DisplayType type) {
+    ALOGW_IF(mBuiltinDisplays[type],
+            "Overwriting display token for display type %d", type);
+    mBuiltinDisplays[type] = new BBinder();
+    DisplayDeviceState info(type);
+    // All non-virtual displays are currently considered secure.
+    info.isSecure = true;
+    mCurrentState.displays.add(mBuiltinDisplays[type], info);
+}
+
 sp<IBinder> SurfaceFlinger::getBuiltInDisplay(int32_t id) {
     if (uint32_t(id) >= DisplayDevice::NUM_DISPLAY_TYPES) {
         ALOGE("getDefaultDisplay: id=%d is not a valid default display id", id);
         return NULL;
     }
-    return mDefaultDisplays[id];
+    return mBuiltinDisplays[id];
 }
 
 sp<IGraphicBufferAlloc> SurfaceFlinger::createGraphicBufferAlloc()
@@ -462,6 +472,8 @@
     ALOGI(  "SurfaceFlinger's main thread ready to run. "
             "Initializing graphics H/W...");
 
+    Mutex::Autolock _l(mStateLock);
+
     // initialize EGL for the default display
     mEGLDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
     eglInitialize(mEGLDisplay, NULL, NULL);
@@ -482,14 +494,13 @@
     // initialize our non-virtual displays
     for (size_t i=0 ; i<DisplayDevice::NUM_DISPLAY_TYPES ; i++) {
         DisplayDevice::DisplayType type((DisplayDevice::DisplayType)i);
-        mDefaultDisplays[i] = new BBinder();
-        wp<IBinder> token = mDefaultDisplays[i];
-
         // set-up the displays that are already connected
         if (mHwc->isConnected(i) || type==DisplayDevice::DISPLAY_PRIMARY) {
             // All non-virtual displays are currently considered secure.
             bool isSecure = true;
-            mCurrentState.displays.add(token, DisplayDeviceState(type));
+            createBuiltinDisplayLocked(type);
+            wp<IBinder> token = mBuiltinDisplays[i];
+
             sp<FramebufferSurface> fbs = new FramebufferSurface(*mHwc, i);
             sp<SurfaceTextureClient> stc = new SurfaceTextureClient(
                         static_cast< sp<ISurfaceTexture> >(fbs->getBufferQueue()));
@@ -601,9 +612,9 @@
 }
 
 status_t SurfaceFlinger::getDisplayInfo(const sp<IBinder>& display, DisplayInfo* info) {
-    int32_t type = BAD_VALUE;
+    int32_t type = NAME_NOT_FOUND;
     for (int i=0 ; i<DisplayDevice::NUM_DISPLAY_TYPES ; i++) {
-        if (display == mDefaultDisplays[i]) {
+        if (display == mBuiltinDisplays[i]) {
             type = i;
             break;
         }
@@ -614,10 +625,6 @@
     }
 
     const HWComposer& hwc(getHwComposer());
-    if (!hwc.isConnected(type)) {
-        return NAME_NOT_FOUND;
-    }
-
     float xdpi = hwc.getDpiX(type);
     float ydpi = hwc.getDpiY(type);
 
@@ -745,11 +752,11 @@
 
     if (uint32_t(type) < DisplayDevice::NUM_DISPLAY_TYPES) {
         Mutex::Autolock _l(mStateLock);
-        if (connected == false) {
-            mCurrentState.displays.removeItem(mDefaultDisplays[type]);
+        if (connected) {
+            createBuiltinDisplayLocked((DisplayDevice::DisplayType)type);
         } else {
-            DisplayDeviceState info((DisplayDevice::DisplayType)type);
-            mCurrentState.displays.add(mDefaultDisplays[type], info);
+            mCurrentState.displays.removeItem(mBuiltinDisplays[type]);
+            mBuiltinDisplays[type].clear();
         }
         setTransactionFlags(eDisplayTransactionNeeded);
 
@@ -1069,7 +1076,7 @@
 
     if (transactionFlags & eTraversalNeeded) {
         for (size_t i=0 ; i<count ; i++) {
-            const sp<LayerBase>& layer = currentLayers[i];
+            const sp<LayerBase>& layer(currentLayers[i]);
             uint32_t trFlags = layer->getTransactionFlags(eTransactionNeeded);
             if (!trFlags) continue;
 
@@ -1142,18 +1149,6 @@
                             disp->setProjection(state.orientation,
                                     state.viewport, state.frame);
                         }
-
-                        // Walk through all the layers in currentLayers,
-                        // and update their transform hint.
-                        //
-                        // TODO: we could be much more clever about which
-                        // layers we touch and how often we do these updates
-                        // (e.g. only touch the layers associated with this
-                        // display, and only on a rotation).
-                        for (size_t i = 0; i < count; i++) {
-                            const sp<LayerBase>& layerBase = currentLayers[i];
-                            layerBase->updateTransformHint();
-                        }
                     }
                 }
             }
@@ -1163,7 +1158,6 @@
             for (size_t i=0 ; i<cc ; i++) {
                 if (draw.indexOfKey(curr.keyAt(i)) < 0) {
                     const DisplayDeviceState& state(curr[i]);
-                    bool isSecure = false;
 
                     sp<FramebufferSurface> fbs;
                     sp<SurfaceTextureClient> stc;
@@ -1174,10 +1168,6 @@
                                 "surface is provided (%p), ignoring it",
                                 state.surface.get());
 
-                        // All non-virtual displays are currently considered
-                        // secure.
-                        isSecure = true;
-
                         // for supported (by hwc) displays we provide our
                         // own rendering surface
                         fbs = new FramebufferSurface(*mHwc, state.type);
@@ -1188,13 +1178,12 @@
                         if (state.surface != NULL) {
                             stc = new SurfaceTextureClient(state.surface);
                         }
-                        isSecure = state.isSecure;
                     }
 
                     const wp<IBinder>& display(curr.keyAt(i));
                     if (stc != NULL) {
                         sp<DisplayDevice> hw = new DisplayDevice(this,
-                                state.type, isSecure, display, stc, fbs,
+                                state.type, state.isSecure, display, stc, fbs,
                                 mEGLConfig);
                         hw->setLayerStack(state.layerStack);
                         hw->setProjection(state.orientation,
@@ -1208,6 +1197,61 @@
         }
     }
 
+    if (transactionFlags & (eTraversalNeeded|eDisplayTransactionNeeded)) {
+        // The transform hint might have changed for some layers
+        // (either because a display has changed, or because a layer
+        // as changed).
+        //
+        // Walk through all the layers in currentLayers,
+        // and update their transform hint.
+        //
+        // If a layer is visible only on a single display, then that
+        // display is used to calculate the hint, otherwise we use the
+        // default display.
+        //
+        // NOTE: we do this here, rather than in rebuildLayerStacks() so that
+        // the hint is set before we acquire a buffer from the surface texture.
+        //
+        // NOTE: layer transactions have taken place already, so we use their
+        // drawing state. However, SurfaceFlinger's own transaction has not
+        // happened yet, so we must use the current state layer list
+        // (soon to become the drawing state list).
+        //
+        sp<const DisplayDevice> disp;
+        uint32_t currentlayerStack = 0;
+        for (size_t i=0; i<count; i++) {
+            // NOTE: we rely on the fact that layers are sorted by
+            // layerStack first (so we don't have to traverse the list
+            // of displays for every layer).
+            const sp<LayerBase>& layerBase(currentLayers[i]);
+            uint32_t layerStack = layerBase->drawingState().layerStack;
+            if (i==0 || currentlayerStack != layerStack) {
+                currentlayerStack = layerStack;
+                // figure out if this layerstack is mirrored
+                // (more than one display) if so, pick the default display,
+                // if not, pick the only display it's on.
+                disp.clear();
+                for (size_t dpy=0 ; dpy<mDisplays.size() ; dpy++) {
+                    sp<const DisplayDevice> hw(mDisplays[dpy]);
+                    if (hw->getLayerStack() == currentlayerStack) {
+                        if (disp == NULL) {
+                            disp = hw;
+                        } else {
+                            disp = getDefaultDisplayDevice();
+                            break;
+                        }
+                    }
+                }
+            }
+            if (disp != NULL) {
+                // presumably this means this layer is using a layerStack
+                // that is not visible on any display
+                layerBase->updateTransformHint(disp);
+            }
+        }
+    }
+
+
     /*
      * Perform our own transaction if needed
      */
@@ -2002,7 +2046,7 @@
     Vector<DisplayState> displays;
     DisplayState d;
     d.what = DisplayState::eDisplayProjectionChanged;
-    d.token = mDefaultDisplays[DisplayDevice::DISPLAY_PRIMARY];
+    d.token = mBuiltinDisplays[DisplayDevice::DISPLAY_PRIMARY];
     d.orientation = DisplayState::eOrientationDefault;
     d.frame.makeInvalid();
     d.viewport.makeInvalid();
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index b0d3bac..1b549e4 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -112,7 +112,7 @@
 
     // returns the default Display
     sp<const DisplayDevice> getDefaultDisplayDevice() const {
-        return getDisplayDevice(mDefaultDisplays[DisplayDevice::DISPLAY_PRIMARY]);
+        return getDisplayDevice(mBuiltinDisplays[DisplayDevice::DISPLAY_PRIMARY]);
     }
 
     // utility function to delete a texture on the main thread
@@ -328,6 +328,9 @@
     // called when starting, or restarting after system_server death
     void initializeDisplays();
 
+    // Create an IBinder for a builtin display and add it to current state
+    void createBuiltinDisplayLocked(DisplayDevice::DisplayType type);
+
     // NOTE: can only be called from the main thread or with mStateLock held
     sp<const DisplayDevice> getDisplayDevice(const wp<IBinder>& dpy) const {
         return mDisplays.valueFor(dpy);
@@ -422,7 +425,7 @@
     EGLContext mEGLContext;
     EGLConfig mEGLConfig;
     EGLDisplay mEGLDisplay;
-    sp<IBinder> mDefaultDisplays[DisplayDevice::NUM_DISPLAY_TYPES];
+    sp<IBinder> mBuiltinDisplays[DisplayDevice::NUM_DISPLAY_TYPES];
 
     // Can only accessed from the main thread, these members
     // don't need synchronization