Video decode in hardware on ARM platform.

content/common/gpu/media/gles2_texture_to_egl_image_translator.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 "content/common/gpu/media/gles2_texture_to_egl_image_translator.h"
+#include "ui/gfx/gl/gl_surface_egl.h"
 
 #include "base/logging.h"
 
 // Get EGL extension functions.
 static PFNEGLCREATEIMAGEKHRPROC egl_create_image_khr =
     reinterpret_cast<PFNEGLCREATEIMAGEKHRPROC>(
         eglGetProcAddress("eglCreateImageKHR"));
 static PFNEGLDESTROYIMAGEKHRPROC egl_destroy_image_khr =
     reinterpret_cast<PFNEGLDESTROYIMAGEKHRPROC>(
         eglGetProcAddress("eglDestroyImageKHR"));
+static PFNGLEGLIMAGETARGETTEXTURE2DOESPROC glegl_image_targettexture_2does =
+    reinterpret_cast<PFNGLEGLIMAGETARGETTEXTURE2DOESPROC>(
+        eglGetProcAddress("glEGLImageTargetTexture2DOES"));
 
 static bool AreEGLExtensionsInitialized() {
   return (egl_create_image_khr && egl_destroy_image_khr);
 }
 
-Gles2TextureToEglImageTranslator::Gles2TextureToEglImageTranslator() {
+Gles2TextureToEglImageTranslator::Gles2TextureToEglImageTranslator(
+    bool use_backing_pixmaps)
+    : use_backing_pixmaps_(use_backing_pixmaps) {
   if (!AreEGLExtensionsInitialized()) {

[Ami GONE FROM CHROMIUM, 2012/02/20 16:54:28]

What happens if glegl_image_targettexture_2does is NULL?

I *think* glEGLImageTargetTexture2DOES is expected to always be present on the
platforms this code runs on (tegra & exynos), meaning
glegl_image_targettexture_2does should be part of AreEGLExtensionsInitialized().
If that's wrong (it's an optional extension), then I guess the if statement here
wants to be something like:
if (!AreEGLExtensionsInitialized() ||
    (use_backing_pixmaps_ && !glegl_image_targettexture_2does)) {
...

     LOG(DFATAL) << "Failed to get EGL extensions";
     return;
   }
   CHECK_EQ(eglGetError(), EGL_SUCCESS);
 }
 
 
 Gles2TextureToEglImageTranslator::~Gles2TextureToEglImageTranslator() {
 }
 
 EGLImageKHR Gles2TextureToEglImageTranslator::TranslateToEglImage(
-    EGLDisplay egl_display, EGLContext egl_context, uint32 texture) {
-  EGLint attrib = EGL_NONE;
+    EGLDisplay egl_display, EGLContext egl_context,
+    uint32 texture,
+    gfx::Size* dimensions) {
   if (!egl_create_image_khr)
     return EGL_NO_IMAGE_KHR;
-  // Create an EGLImage
-  EGLImageKHR hEglImage = egl_create_image_khr(
-      egl_display,
-      egl_context,
-      EGL_GL_TEXTURE_2D_KHR,
-      reinterpret_cast<EGLClientBuffer>(texture),
-      &attrib);
+  EGLImageKHR hEglImage;
+  if (use_backing_pixmaps_) {
+    if (!glegl_image_targettexture_2does)
+      return EGL_NO_IMAGE_KHR;
+
+    EGLint image_attrs[] = { EGL_IMAGE_PRESERVED_KHR, 1 , EGL_NONE };
+
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, texture);
+
+    Display* x_display = gfx::GLSurfaceEGL::GetNativeDisplay();
+    Pixmap pixmap = XCreatePixmap(x_display, RootWindow(x_display, 0),
+                                  dimensions->width(),
+                                  dimensions->height(), 32);
+
+    hEglImage = egl_create_image_khr(egl_display,
+                                     EGL_NO_CONTEXT,
+                                     EGL_NATIVE_PIXMAP_KHR,
+                                     (EGLClientBuffer)pixmap,
+                                     image_attrs);
+
+    glegl_image_targettexture_2does(GL_TEXTURE_2D, hEglImage);
+    bool inserted = eglimage_pixmap_.insert(std::make_pair(
+                                            hEglImage, pixmap)).second;
+    DCHECK(inserted);
+  } else {
+    EGLint attrib = EGL_NONE;
+    // Create an EGLImage
+    hEglImage = egl_create_image_khr(egl_display,
+                                     egl_context,
+                                     EGL_GL_TEXTURE_2D_KHR,
+                                     reinterpret_cast<EGLClientBuffer>(texture),
+                                     &attrib);
+  }
   CHECK(hEglImage) << "Failed to eglCreateImageKHR for " << texture
                    << ", error: 0x" << std::hex << eglGetError();
   return hEglImage;
 }
 
 uint32 Gles2TextureToEglImageTranslator::TranslateToTexture(
     EGLImageKHR egl_image) {
   // TODO(vhiremath@nvidia.com)
   // Fill in the appropriate implementation.
   GLuint texture = 0;
   NOTIMPLEMENTED();
   return texture;
 }
 
 void Gles2TextureToEglImageTranslator::DestroyEglImage(
     EGLDisplay egl_display, EGLImageKHR egl_image) {
   // Clients of this class will call this method for each EGLImage handle.
   // Actual destroying of the handles is done here.
   if (!egl_destroy_image_khr) {
     DLOG(ERROR) << "egl_destroy_image_khr failed";
     return;
   }
   egl_destroy_image_khr(egl_display, egl_image);
+
+  if (use_backing_pixmaps_) {
+    ImagePixmap::iterator it = eglimage_pixmap_.find(egl_image);
+    CHECK(it != eglimage_pixmap_.end());
+    Pixmap pixmap = it->second;
+    eglimage_pixmap_.erase(it);
+    Display* x_display = gfx::GLSurfaceEGL::GetNativeDisplay();
+    XFreePixmap(x_display, pixmap);
+  }
 }