Speculative revert by sheriff

media/tools/player_x11/x11_video_renderer.cc

+// Copyright (c) 2012 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 "media/tools/player_x11/x11_video_renderer.h"
+
+#include <dlfcn.h>
+#include <X11/Xutil.h>
+#include <X11/extensions/Xrender.h>
+#include <X11/extensions/Xcomposite.h>
+
+#include "base/bind.h"
+#include "base/message_loop/message_loop.h"
+#include "media/base/video_frame.h"
+#include "media/base/yuv_convert.h"
+
+// Creates a 32-bit XImage.
+static XImage* CreateImage(Display* display, int width, int height) {
+  VLOG(0) << "Allocating XImage " << width << "x" << height;
+  return  XCreateImage(display,
+                       DefaultVisual(display, DefaultScreen(display)),
+                       DefaultDepth(display, DefaultScreen(display)),
+                       ZPixmap,
+                       0,
+                       static_cast<char*>(malloc(width * height * 4)),
+                       width,
+                       height,
+                       32,
+                       width * 4);
+}
+
+// Returns the picture format for ARGB.
+// This method is originally from chrome/common/x11_util.cc.
+static XRenderPictFormat* GetRenderARGB32Format(Display* dpy) {
+  static XRenderPictFormat* pictformat = NULL;
+  if (pictformat)
+    return pictformat;
+
+  // First look for a 32-bit format which ignores the alpha value.
+  XRenderPictFormat templ;
+  templ.depth = 32;
+  templ.type = PictTypeDirect;
+  templ.direct.red = 16;
+  templ.direct.green = 8;
+  templ.direct.blue = 0;
+  templ.direct.redMask = 0xff;
+  templ.direct.greenMask = 0xff;
+  templ.direct.blueMask = 0xff;
+  templ.direct.alphaMask = 0;
+
+  static const unsigned long kMask =
+      PictFormatType | PictFormatDepth |
+      PictFormatRed | PictFormatRedMask |
+      PictFormatGreen | PictFormatGreenMask |
+      PictFormatBlue | PictFormatBlueMask |
+      PictFormatAlphaMask;
+
+  pictformat = XRenderFindFormat(dpy, kMask, &templ, 0 /* first result */);
+
+  if (!pictformat) {
+    // Not all X servers support xRGB32 formats. However, the XRender spec
+    // says that they must support an ARGB32 format, so we can always return
+    // that.
+    pictformat = XRenderFindStandardFormat(dpy, PictStandardARGB32);
+    CHECK(pictformat) << "XRender ARGB32 not supported.";
+  }
+
+  return pictformat;
+}
+
+X11VideoRenderer::X11VideoRenderer(Display* display, Window window)
+    : display_(display),
+      window_(window),
+      image_(NULL),
+      picture_(0),
+      use_render_(false) {
+}
+
+X11VideoRenderer::~X11VideoRenderer() {
+  if (image_)
+    XDestroyImage(image_);
+  if (use_render_)
+    XRenderFreePicture(display_, picture_);
+}
+
+void X11VideoRenderer::Paint(
+    const scoped_refptr<media::VideoFrame>& video_frame) {
+  if (!image_)
+    Initialize(video_frame->coded_size(), video_frame->visible_rect());
+
+  const int coded_width = video_frame->coded_size().width();
+  const int coded_height = video_frame->coded_size().height();
+  const int visible_width = video_frame->visible_rect().width();
+  const int visible_height = video_frame->visible_rect().height();
+
+  // Check if we need to reallocate our XImage.
+  if (image_->width != coded_width || image_->height != coded_height) {
+    XDestroyImage(image_);
+    image_ = CreateImage(display_, coded_width, coded_height);
+  }
+
+  // Convert YUV frame to RGB.
+  DCHECK(video_frame->format() == media::VideoFrame::YV12 ||
+         video_frame->format() == media::VideoFrame::I420 ||
+         video_frame->format() == media::VideoFrame::YV16);
+  DCHECK(video_frame->stride(media::VideoFrame::kUPlane) ==
+         video_frame->stride(media::VideoFrame::kVPlane));
+
+  DCHECK(image_->data);
+  media::YUVType yuv_type = (video_frame->format() == media::VideoFrame::YV12 ||
+                             video_frame->format() == media::VideoFrame::I420)
+                                ? media::YV12
+                                : media::YV16;
+  media::ConvertYUVToRGB32(video_frame->data(media::VideoFrame::kYPlane),
+                           video_frame->data(media::VideoFrame::kUPlane),
+                           video_frame->data(media::VideoFrame::kVPlane),
+                           (uint8*)image_->data, coded_width, coded_height,
+                           video_frame->stride(media::VideoFrame::kYPlane),
+                           video_frame->stride(media::VideoFrame::kUPlane),
+                           image_->bytes_per_line,
+                           yuv_type);
+
+  if (use_render_) {
+    // If XRender is used, we'll upload the image to a pixmap. And then
+    // creats a picture from the pixmap and composite the picture over
+    // the picture represending the window.
+
+    // Creates a XImage.
+    XImage image;
+    memset(&image, 0, sizeof(image));
+    image.width = coded_width;
+    image.height = coded_height;
+    image.depth = 32;
+    image.bits_per_pixel = 32;
+    image.format = ZPixmap;
+    image.byte_order = LSBFirst;
+    image.bitmap_unit = 8;
+    image.bitmap_bit_order = LSBFirst;
+    image.bytes_per_line = image_->bytes_per_line;
+    image.red_mask = 0xff;
+    image.green_mask = 0xff00;
+    image.blue_mask = 0xff0000;
+    image.data = image_->data;
+
+    // Creates a pixmap and uploads from the XImage.
+    unsigned long pixmap = XCreatePixmap(display_, window_,
+                                         visible_width, visible_height,
+                                         32);
+    GC gc = XCreateGC(display_, pixmap, 0, NULL);
+    XPutImage(display_, pixmap, gc, &image,
+              video_frame->visible_rect().x(),
+              video_frame->visible_rect().y(),
+              0, 0,
+              visible_width, visible_height);
+    XFreeGC(display_, gc);
+
+    // Creates the picture representing the pixmap.
+    unsigned long picture = XRenderCreatePicture(
+        display_, pixmap, GetRenderARGB32Format(display_), 0, NULL);
+
+    // Composite the picture over the picture representing the window.
+    XRenderComposite(display_, PictOpSrc, picture, 0,
+                     picture_, 0, 0, 0, 0, 0, 0,
+                     visible_width, visible_height);
+
+    XRenderFreePicture(display_, picture);
+    XFreePixmap(display_, pixmap);
+    return;
+  }
+
+  // If XRender is not used, simply put the image to the server.
+  // This will have a tearing effect but this is OK.
+  // TODO(hclam): Upload the image to a pixmap and do XCopyArea()
+  // to the window.
+  GC gc = XCreateGC(display_, window_, 0, NULL);
+  XPutImage(display_, window_, gc, image_,
+            video_frame->visible_rect().x(),
+            video_frame->visible_rect().y(),
+            0, 0, visible_width, visible_height);
+  XFlush(display_);
+  XFreeGC(display_, gc);
+}
+
+void X11VideoRenderer::Initialize(gfx::Size coded_size,
+                                  gfx::Rect visible_rect) {
+  CHECK(!image_);
+  VLOG(0) << "Initializing X11 Renderer...";
+
+  // Resize the window to fit that of the video.
+  XResizeWindow(display_, window_, visible_rect.width(), visible_rect.height());
+  image_ = CreateImage(display_, coded_size.width(), coded_size.height());
+
+  // Testing XRender support. We'll use the very basic of XRender
+  // so if it presents it is already good enough. We don't need
+  // to check its version.
+  int dummy;
+  use_render_ = XRenderQueryExtension(display_, &dummy, &dummy);
+
+  if (use_render_) {
+    VLOG(0) << "Using XRender extension.";
+
+    // If we are using XRender, we'll create a picture representing the
+    // window.
+    XWindowAttributes attr;
+    XGetWindowAttributes(display_, window_, &attr);
+
+    XRenderPictFormat* pictformat = XRenderFindVisualFormat(
+        display_,
+        attr.visual);
+    CHECK(pictformat) << "XRender does not support default visual";
+
+    picture_ = XRenderCreatePicture(display_, window_, pictformat, 0, NULL);
+    CHECK(picture_) << "Backing picture not created";
+  }
+}