Fix EGLUtils::selectConfigForPixelFormat()

- renderscript now calls EGL directly instead of relying on this function
- surfaceflinger also does its own EGLConfig selection
- selectConfigForPixelFormat stays for legacy reason (many tests use it) but
it now only tries to match the alpha channel of the format rather than the
format itself.

this will allow implementations who don't support the exact formats
defined in the HAL to work properly.

Bug: 4998223

Change-Id: Ic664dfc14d5072a514b6f77a115d1521bfc1578f

2 files changed, 78 insertions, 25 deletions

diff --git a/libs/ui/EGLUtils.cpp b/libs/ui/EGLUtils.cpp
index f24a71d88d..020646b9c4 100644
--- a/libs/ui/EGLUtils.cpp
+++ b/libs/ui/EGLUtils.cpp
@@ -24,6 +24,8 @@
 
 #include <EGL/egl.h>
 
+#include <system/graphics.h>
+
 #include <private/ui/android_natives_priv.h>
 
 // ----------------------------------------------------------------------------
@@ -67,31 +69,49 @@ status_t EGLUtils::selectConfigForPixelFormat(
         return BAD_VALUE;
     
     // Get all the "potential match" configs...
-    if (eglGetConfigs(dpy, NULL, 0, &numConfigs) == EGL_FALSE)
+    if (eglChooseConfig(dpy, attrs, 0, 0, &numConfigs) == EGL_FALSE)
         return BAD_VALUE;
 
-    EGLConfig* const configs = (EGLConfig*)malloc(sizeof(EGLConfig)*numConfigs);
-    if (eglChooseConfig(dpy, attrs, configs, numConfigs, &n) == EGL_FALSE) {
-        free(configs);
-        return BAD_VALUE;
-    }
-    
-    int i;
-    EGLConfig config = NULL;
-    for (i=0 ; i<n ; i++) {
-        EGLint nativeVisualId = 0;
-        eglGetConfigAttrib(dpy, configs[i], EGL_NATIVE_VISUAL_ID, &nativeVisualId);
-        if (nativeVisualId>0 && format == nativeVisualId) {
+    if (numConfigs) {
+        EGLConfig* const configs = new EGLConfig[numConfigs];
+        if (eglChooseConfig(dpy, attrs, configs, numConfigs, &n) == EGL_FALSE) {
+            delete [] configs;
+            return BAD_VALUE;
+        }
+
+        bool hasAlpha = false;
+        switch (format) {
+            case HAL_PIXEL_FORMAT_RGBA_8888:
+            case HAL_PIXEL_FORMAT_BGRA_8888:
+            case HAL_PIXEL_FORMAT_RGBA_5551:
+            case HAL_PIXEL_FORMAT_RGBA_4444:
+                hasAlpha = true;
+                break;
+        }
+
+        // The first config is guaranteed to over-satisfy the constraints
+        EGLConfig config = configs[0];
+
+        // go through the list and skip configs that over-satisfy our needs
+        int i;
+        for (i=0 ; i<n ; i++) {
+            if (!hasAlpha) {
+                EGLint alphaSize;
+                eglGetConfigAttrib(dpy, configs[i], EGL_ALPHA_SIZE, &alphaSize);
+                if (alphaSize > 0) {
+                    continue;
+                }
+            }
             config = configs[i];
             break;
         }
-    }
 
-    free(configs);
-    
-    if (i<n) {
-        *outConfig = config;
-        return NO_ERROR;
+        delete [] configs;
+
+        if (i<n) {
+            *outConfig = config;
+            return NO_ERROR;
+        }
     }
 
     return NAME_NOT_FOUND;
diff --git a/services/surfaceflinger/DisplayHardware/DisplayHardware.cpp b/services/surfaceflinger/DisplayHardware/DisplayHardware.cpp
index 33125c487e..7bf3e0ae09 100644
--- a/services/surfaceflinger/DisplayHardware/DisplayHardware.cpp
+++ b/services/surfaceflinger/DisplayHardware/DisplayHardware.cpp
@@ -99,6 +99,31 @@ uint32_t DisplayHardware::getMaxViewportDims() const {
             mMaxViewportDims[0] : mMaxViewportDims[1];
 }
 
+static status_t selectConfigForPixelFormat(
+        EGLDisplay dpy,
+        EGLint const* attrs,
+        PixelFormat format,
+        EGLConfig* outConfig)
+{
+    EGLConfig config = NULL;
+    EGLint numConfigs = -1, n=0;
+    eglGetConfigs(dpy, NULL, 0, &numConfigs);
+    EGLConfig* const configs = new EGLConfig[numConfigs];
+    eglChooseConfig(dpy, attrs, configs, numConfigs, &n);
+    for (int i=0 ; i<n ; i++) {
+        EGLint nativeVisualId = 0;
+        eglGetConfigAttrib(dpy, configs[i], EGL_NATIVE_VISUAL_ID, &nativeVisualId);
+        if (nativeVisualId>0 && format == nativeVisualId) {
+            *outConfig = configs[i];
+            delete [] configs;
+            return NO_ERROR;
+        }
+    }
+    delete [] configs;
+    return NAME_NOT_FOUND;
+}
+
+
 void DisplayHardware::init(uint32_t dpy)
 {
     mNativeWindow = new FramebufferNativeWindow();
@@ -108,6 +133,9 @@ void DisplayHardware::init(uint32_t dpy)
         exit(0);
     }
 
+    int format;
+    ANativeWindow const * const window = mNativeWindow.get();
+    window->query(window, NATIVE_WINDOW_FORMAT, &format);
     mDpiX = mNativeWindow->xdpi;
     mDpiY = mNativeWindow->ydpi;
     mRefreshRate = fbDev->fps;
@@ -116,11 +144,13 @@ void DisplayHardware::init(uint32_t dpy)
     EGLint numConfigs=0;
     EGLSurface surface;
     EGLContext context;
+    EGLBoolean result;
+    status_t err;
 
     // initialize EGL
     EGLint attribs[] = {
-            EGL_SURFACE_TYPE,   EGL_WINDOW_BIT,
-            EGL_NONE,           0,
+            EGL_SURFACE_TYPE,       EGL_WINDOW_BIT,
+            EGL_NONE,               0,
             EGL_NONE
     };
 
@@ -141,9 +171,8 @@ void DisplayHardware::init(uint32_t dpy)
     eglInitialize(display, NULL, NULL);
     eglGetConfigs(display, NULL, 0, &numConfigs);
 
-    EGLConfig config;
-    status_t err = EGLUtils::selectConfigForNativeWindow(
-            display, attribs, mNativeWindow.get(), &config);
+    EGLConfig config = NULL;
+    err = selectConfigForPixelFormat(display, attribs, format, &config);
     LOGE_IF(err, "couldn't find an EGLConfig matching the screen format");
     
     EGLint r,g,b,a;
@@ -224,7 +253,11 @@ void DisplayHardware::init(uint32_t dpy)
      * Gather OpenGL ES extensions
      */
 
-    eglMakeCurrent(display, surface, surface, context);
+    result = eglMakeCurrent(display, surface, surface, context);
+    if (!result) {
+        LOGE("Couldn't create a working GLES context. check logs. exiting...");
+        exit(0);
+    }
 
     GLExtensions& extensions(GLExtensions::getInstance());
     extensions.initWithGLStrings(