From 265d9c076a588cf4cd811fbafd999c7ffe36641b Mon Sep 17 00:00:00 2001
From: Mathias Agopian <mathias@google.com>
Date: Thu, 6 Aug 2009 16:05:39 -0700
Subject: added two EGL helpers for selecting a config matching a certain
 pixelformat or native window type

---
 libs/ui/EGLUtils.cpp | 104 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 libs/ui/EGLUtils.cpp

(limited to 'libs/ui/EGLUtils.cpp')

diff --git a/libs/ui/EGLUtils.cpp b/libs/ui/EGLUtils.cpp
new file mode 100644
index 000000000000..9b2839d25282
--- /dev/null
+++ b/libs/ui/EGLUtils.cpp
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+#define LOG_TAG "EGLUtils"
+
+#include <utils/Errors.h>
+
+#include <ui/EGLUtils.h>
+
+#include <EGL/egl.h>
+
+#include <private/ui/android_natives_priv.h>
+
+// ----------------------------------------------------------------------------
+namespace android {
+// ----------------------------------------------------------------------------
+
+status_t EGLUtils::selectConfigForPixelFormat(
+        EGLDisplay dpy,
+        EGLint const* attrs,
+        PixelFormat format,
+        EGLConfig* outConfig)
+{
+    EGLint numConfigs = -1, n=0;
+
+    if (outConfig == NULL)
+        return BAD_VALUE;
+    
+    int err;
+    PixelFormatInfo fbFormatInfo;
+    if ((err = getPixelFormatInfo(PixelFormat(format), &fbFormatInfo)) < 0) {
+        return err;
+    }
+
+    // Get all the "potential match" configs...
+    if (eglGetConfigs(dpy, NULL, 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;
+    }
+
+    const int fbSzA = fbFormatInfo.getSize(PixelFormatInfo::INDEX_ALPHA);
+    const int fbSzR = fbFormatInfo.getSize(PixelFormatInfo::INDEX_RED);
+    const int fbSzG = fbFormatInfo.getSize(PixelFormatInfo::INDEX_GREEN);
+    const int fbSzB = fbFormatInfo.getSize(PixelFormatInfo::INDEX_BLUE); 
+    
+    EGLConfig config = NULL;
+    for (int i=0 ; i<n ; i++) {
+        EGLint r,g,b,a;
+        eglGetConfigAttrib(dpy, configs[i], EGL_RED_SIZE,   &r);
+        eglGetConfigAttrib(dpy, configs[i], EGL_GREEN_SIZE, &g);
+        eglGetConfigAttrib(dpy, configs[i], EGL_BLUE_SIZE,  &b);
+        eglGetConfigAttrib(dpy, configs[i], EGL_ALPHA_SIZE, &a);
+        if (fbSzA == a && fbSzR == r && fbSzG == g && fbSzB  == b) {
+            config = configs[i];
+            break;
+        }
+    }
+
+    free(configs);
+    
+    if (config) {
+        *outConfig = config;
+        return NO_ERROR;
+    }
+
+    return NAME_NOT_FOUND;
+}
+
+status_t EGLUtils::selectConfigForNativeWindow(
+        EGLDisplay dpy,
+        EGLint const* attrs,
+        EGLNativeWindowType window,
+        EGLConfig* outConfig)
+{
+    int err;
+    int format;
+    if ((err = window->query(window, NATIVE_WINDOW_FORMAT, &format)) < 0) {
+        return err;
+    }
+
+    return selectConfigForPixelFormat(dpy, attrs, format, outConfig);
+}
+
+// ----------------------------------------------------------------------------
+}; // namespace android
+// ----------------------------------------------------------------------------
-- 
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