GLImage support for Android zero-copy pixel buffers

ui/gl/gl_image_egl.cc

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/gl/gl_image_egl.h"
+
+#include "ui/gl/gl_bindings.h"
+
+// TODO(kaanb): remove when crbug.com/227205 is fixed.
+#define EGL_NATIVE_BUFFER_ANDROID 0x3140
+
+namespace gfx {
+
+GLImageEGL::GLImageEGL(gfx::Size size)
+    : egl_image_(EGL_NO_IMAGE_KHR),
+      size_(size) {
+}
+
+GLImageEGL::~GLImageEGL() {
+  Destroy();
+}
+
+bool GLImageEGL::Initialize(gfx::GpuMemoryBufferHandle buffer) {
+  EGLClientBuffer cbuf = static_cast<EGLClientBuffer>(buffer);
+  EGLint attrs[] = {
+    EGL_IMAGE_PRESERVED_KHR, EGL_TRUE,
+    EGL_NONE,
+  };
+  egl_image_ = eglCreateImageKHR(
+      eglGetDisplay(EGL_DEFAULT_DISPLAY),
+      EGL_NO_CONTEXT,
+      EGL_NATIVE_BUFFER_ANDROID,
+      cbuf,
+      attrs);
+
+  if (egl_image_ == EGL_NO_IMAGE_KHR) {
+    EGLint error = eglGetError();
+    LOG(ERROR) << "Error creating EGLImage: " << error;
+    return false;
+  }
+
+  return true;
+}
+
+bool GLImageEGL::BindTexImage() {
+  if (egl_image_ == EGL_NO_IMAGE_KHR) {
+    LOG(ERROR) << "NULL EGLImage in BindTexImage";
+    return false;
+  }
+
+  glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, egl_image_);
+
+  if (glGetError() != GL_NO_ERROR) {
+    return false;
+  }
+
+  return true;
+}
+
+gfx::Size GLImageEGL::GetSize() {
+  return size_;
+}
+
+void GLImageEGL::Destroy() {
+  if (egl_image_ == EGL_NO_IMAGE_KHR)
+    return;
+
+  EGLBoolean success = eglDestroyImageKHR(
+      eglGetDisplay(EGL_DEFAULT_DISPLAY), egl_image_);
+
+  if (success == EGL_FALSE) {
+    EGLint error = eglGetError();
+    LOG(ERROR) << "Error destroying EGLImage: " << error;
+  }
+
+  egl_image_ = EGL_NO_IMAGE_KHR;
+}
+
+void GLImageEGL::ReleaseTexImage() {
+  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 0, 0, 0, GL_RGBA, GL_UNSIGNED_BYTE,
+      NULL);
+}
+
+}  // namespace gfx