ui: Add Linux dma-buf implementation of GLImage.

ui/gl/gl_image_linux_dma_buffer.cc

+// Copyright 2014 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_linux_dma_buffer.h"
+
+#include <unistd.h>
+
+#define FOURCC(a, b, c, d)                                    \
+  ((static_cast<uint32>(a)) | (static_cast<uint32>(b) << 8) | \
+   (static_cast<uint32>(c) << 16) | (static_cast<uint32>(d) << 24))
+
+#define DRM_FORMAT_ARGB8888 FOURCC('A', 'R', '2', '4')
+#define DRM_FORMAT_XRGB8888 FOURCC('X', 'R', '2', '4')
+
+namespace gfx {
+namespace {
+
+bool ValidFormat(unsigned internalformat, gfx::GpuMemoryBuffer::Format format) {
+  switch (internalformat) {
+    case GL_RGB:
+      switch (format) {
+        case gfx::GpuMemoryBuffer::RGBX_8888:
+          return true;
+        case gfx::GpuMemoryBuffer::RGBA_8888:
+        case gfx::GpuMemoryBuffer::BGRA_8888:
+          return false;
+      }
+      NOTREACHED();
+      return false;
+    case GL_RGBA:
+      switch (format) {
+        case gfx::GpuMemoryBuffer::BGRA_8888:
+          return true;
+        case gfx::GpuMemoryBuffer::RGBX_8888:
+        case gfx::GpuMemoryBuffer::RGBA_8888:
+          return false;
+      }
+      NOTREACHED();
+      return false;
+    default:
+      return false;
+  }
+}
+
+EGLint FourCC(gfx::GpuMemoryBuffer::Format format) {
+  switch (format) {
+    case gfx::GpuMemoryBuffer::BGRA_8888:
+      return DRM_FORMAT_ARGB8888;
+    case gfx::GpuMemoryBuffer::RGBX_8888:
+      return DRM_FORMAT_XRGB8888;
+    case gfx::GpuMemoryBuffer::RGBA_8888:
+      NOTREACHED();
+      return 0;
+  }
+
+  NOTREACHED();
+  return 0;
+}
+
+bool IsHandleValid(const base::FileDescriptor& handle) {
+  return handle.fd >= 0;
+}
+
+}  // namespace
+
+GLImageLinuxDMABuffer::GLImageLinuxDMABuffer(const gfx::Size& size,
+                                             unsigned internalformat)
+    : GLImageEGL(size), internalformat_(internalformat) {
+}
+
+GLImageLinuxDMABuffer::~GLImageLinuxDMABuffer() {
+}
+
+bool GLImageLinuxDMABuffer::Initialize(const base::FileDescriptor& handle,
+                                       gfx::GpuMemoryBuffer::Format format,
+                                       int pitch) {
+  if (!ValidFormat(internalformat_, format)) {
+    LOG(ERROR) << "Invalid format: " << internalformat_;
+    return false;
+  }
+
+  if (!IsHandleValid(handle)) {
+    LOG(ERROR) << "Invalid file descriptor: " << handle.fd;
+    return false;
+  }
+
+  // Note: If eglCreateImageKHR is successful for a EGL_LINUX_DMA_BUF_EXT
+  // target, the EGL will take a reference to the dma_buf.
+  EGLint attrs[] = {EGL_WIDTH,
+                    size_.width(),
+                    EGL_HEIGHT,
+                    size_.height(),
+                    EGL_LINUX_DRM_FOURCC_EXT,
+                    FourCC(format),
+                    EGL_DMA_BUF_PLANE0_FD_EXT,
+                    handle.fd,
+                    EGL_DMA_BUF_PLANE0_OFFSET_EXT,
+                    0,
+                    EGL_DMA_BUF_PLANE0_PITCH_EXT,
+                    pitch,
+                    EGL_NONE};
+  return GLImageEGL::Initialize(
+      EGL_LINUX_DMA_BUF_EXT, static_cast<EGLClientBuffer>(NULL), attrs);
+}
+
+}  // namespace gfx