/**
 * clutter_image_set_area:
 * @image: a #ClutterImage
 * @data: (array): the image data, as an array of bytes
 * @pixel_format: the Cogl pixel format of the image data
 * @rect: a rectangle indicating the area that should be set
 * @row_stride: the length of each row inside @data
 * @error: return location for a #GError, or %NULL
 *
 * Sets the image data to be display by @image, using @rect to indicate
 * the position and size of the image data to be set.
 *
 * If the @image does not have any image data set when this function is
 * called, a new texture will be created with the size of the width and
 * height of the rectangle, i.e. calling this function on a newly created
 * #ClutterImage will be the equivalent of calling clutter_image_set_data().
 *
 * If the image data was successfully loaded, the @image will be invalidated.
 *
 * In case of error, the @error value will be set, and this function will
 * return %FALSE.
 *
 * The image data is copied in texture memory.
 *
 * Return value: %TRUE if the image data was successfully loaded,
 *   and %FALSE otherwise.
 *
 * Since: 1.10
 */
gboolean
clutter_image_set_area (ClutterImage                 *image,
                        const guint8                 *data,
                        CoglPixelFormat               pixel_format,
                        const cairo_rectangle_int_t  *area,
                        guint                         row_stride,
                        GError                      **error)
{
  ClutterImagePrivate *priv;

  g_return_val_if_fail (CLUTTER_IS_IMAGE (image), FALSE);
  g_return_val_if_fail (data != NULL, FALSE);
  g_return_val_if_fail (area != NULL, FALSE);

  priv = image->priv;

  if (priv->texture == NULL)
    {
      CoglTextureFlags flags = COGL_TEXTURE_NONE;

      if (area->width >= 512 && area->height >= 512)
        flags |= COGL_TEXTURE_NO_ATLAS;

      priv->texture = cogl_texture_new_from_data (area->width,
                                                  area->height,
                                                  flags,
                                                  pixel_format,
                                                  COGL_PIXEL_FORMAT_ANY,
                                                  row_stride,
                                                  data);
    }
  else
    {
      gboolean res;

      res = cogl_texture_set_region (priv->texture,
                                     0, 0,
                                     area->x, area->y,
                                     area->width, area->height,
                                     area->width, area->height,
                                     pixel_format,
                                     row_stride,
                                     data);

      if (!res)
        {
          cogl_object_unref (priv->texture);
          priv->texture = NULL;
        }
    }

  if (priv->texture == NULL)
    {
      g_set_error_literal (error, CLUTTER_IMAGE_ERROR,
                           CLUTTER_IMAGE_ERROR_INVALID_DATA,
                           _("Unable to load image data"));
      return FALSE;
    }

  clutter_content_invalidate (CLUTTER_CONTENT (image));

  return TRUE;
}

void
_cogl_texture_driver_upload_to_gl_3d (GLenum       gl_target,
                                      GLuint       gl_handle,
                                      gboolean     is_foreign,
                                      GLint        height,
                                      GLint        depth,
                                      CoglBitmap  *source_bmp,
                                      GLint        internal_gl_format,
                                      GLuint       source_gl_format,
                                      GLuint       source_gl_type)
{
    int bpp = _cogl_get_format_bpp (_cogl_bitmap_get_format (source_bmp));
    int rowstride = _cogl_bitmap_get_rowstride (source_bmp);
    int bmp_width = _cogl_bitmap_get_width (source_bmp);
    int bmp_height = _cogl_bitmap_get_height (source_bmp);
    guint8 *data;

    _COGL_GET_CONTEXT (ctx, NO_RETVAL);

    _cogl_bind_gl_texture_transient (gl_target, gl_handle, is_foreign);

    /* If the rowstride or image height can't be specified with just
       GL_ALIGNMENT alone then we need to copy the bitmap because there
       is no GL_ROW_LENGTH */
    if (rowstride / bpp != bmp_width ||
            height != bmp_height / depth)
    {
        CoglBitmap *bmp;
        int image_height = bmp_height / depth;
        int i;

        _cogl_texture_driver_prep_gl_for_pixels_upload (bmp_width * bpp, bpp);

        /* Initialize the texture with empty data and then upload each
           image with a sub-region update */

        GE( glTexImage3D (gl_target,
                          0, /* level */
                          internal_gl_format,
                          bmp_width,
                          height,
                          depth,
                          0,
                          source_gl_format,
                          source_gl_type,
                          NULL) );

        bmp = _cogl_bitmap_new_from_data (g_malloc (bpp * bmp_width * height),
                                          _cogl_bitmap_get_format (source_bmp),
                                          bmp_width,
                                          height,
                                          bpp * bmp_width,
                                          (CoglBitmapDestroyNotify) g_free,
                                          NULL);

        for (i = 0; i < depth; i++)
        {
            _cogl_bitmap_copy_subregion (source_bmp,
                                         bmp,
                                         0, image_height * i,
                                         0, 0,
                                         bmp_width,
                                         height);

            data = _cogl_bitmap_bind (bmp,
                                      COGL_BUFFER_ACCESS_READ, 0);

            GE( glTexSubImage3D (gl_target,
                                 0, /* level */
                                 0, /* xoffset */
                                 0, /* yoffset */
                                 i, /* zoffset */
                                 bmp_width, /* width */
                                 height, /* height */
                                 1, /* depth */
                                 source_gl_format,
                                 source_gl_type,
                                 data) );

            _cogl_bitmap_unbind (bmp);
        }

        cogl_object_unref (bmp);
    }
    else
    {
        data = _cogl_bitmap_bind (source_bmp, COGL_BUFFER_ACCESS_READ, 0);

        _cogl_texture_driver_prep_gl_for_pixels_upload (rowstride, bpp);

        GE( glTexImage3D (gl_target,
                          0, /* level */
                          internal_gl_format,
                          bmp_width,
                          height,
                          depth,
                          0,
                          source_gl_format,
                          source_gl_type,
                          data) );
//.........这里部分代码省略.........

/* For reference: There was some deliberation over whether to have a
 * constructor that could throw an exception but looking at standard
 * practices with several high level OO languages including python, C++,
 * C# Java and Ruby they all support exceptions in constructors and the
 * general consensus appears to be that throwing an exception is neater
 * than successfully constructing with an internal error status that
 * would then have to be explicitly checked via some form of ::is_ok()
 * method.
 */
CoglContext *
cogl_context_new (CoglDisplay *display,
                  GError **error)
{
  CoglContext *context;
  GLubyte default_texture_data[] = { 0xff, 0xff, 0xff, 0x0 };
  CoglBitmap *default_texture_bitmap;
  const CoglWinsysVtable *winsys;
  int i;

  _cogl_init ();

#ifdef COGL_ENABLE_PROFILE
  /* We need to be absolutely sure that uprof has been initialized
   * before calling _cogl_uprof_init. uprof_init (NULL, NULL)
   * will be a NOP if it has been initialized but it will also
   * mean subsequent parsing of the UProf GOptionGroup will have no
   * affect.
   *
   * Sadly GOptionGroup based library initialization is extremely
   * fragile by design because GOptionGroups have no notion of
   * dependencies and so the order things are initialized isn't
   * currently under tight control.
   */
  uprof_init (NULL, NULL);
  _cogl_uprof_init ();
#endif

  /* Allocate context memory */
  context = g_malloc0 (sizeof (CoglContext));

  /* Convert the context into an object immediately in case any of the
     code below wants to verify that the context pointer is a valid
     object */
  _cogl_context_object_new (context);

  /* XXX: Gross hack!
   * Currently everything in Cogl just assumes there is a default
   * context which it can access via _COGL_GET_CONTEXT() including
   * code used to construct a CoglContext. Until all of that code
   * has been updated to take an explicit context argument we have
   * to immediately make our pointer the default context.
   */
  _context = context;

  /* Init default values */
  memset (context->features, 0, sizeof (context->features));
  context->feature_flags = 0;
  context->private_feature_flags = 0;

  context->texture_types = NULL;
  context->buffer_types = NULL;

  context->rectangle_state = COGL_WINSYS_RECTANGLE_STATE_UNKNOWN;

  memset (context->winsys_features, 0, sizeof (context->winsys_features));

  if (!display)
    {
      CoglRenderer *renderer = cogl_renderer_new ();
      if (!cogl_renderer_connect (renderer, error))
        {
          g_free (context);
          return NULL;
        }

      display = cogl_display_new (renderer, NULL);
    }
  else
    cogl_object_ref (display);

  if (!cogl_display_setup (display, error))
    {
      cogl_object_unref (display);
      g_free (context);
      return NULL;
    }

  context->display = display;

  /* This is duplicated data, but it's much more convenient to have
     the driver attached to the context and the value is accessed a
     lot throughout Cogl */
  context->driver = display->renderer->driver;

  switch (context->driver)
    {
#ifdef HAVE_COGL_GL
    case COGL_DRIVER_GL:
      context->driver_vtable = &_cogl_driver_gl;
      context->texture_driver = &_cogl_texture_driver_gl;
//.........这里部分代码省略.........

static void
paint_test_backface_culling (TestState *state,
                             CoglFramebuffer *framebuffer)
{
  int draw_num;
  CoglPipeline *base_pipeline = cogl_pipeline_new (test_ctx);

  cogl_framebuffer_orthographic (framebuffer,
                                 0, 0,
                                 state->width,
                                 state->height,
                                 -1,
                                 100);

  cogl_framebuffer_clear4f (framebuffer,
                            COGL_BUFFER_BIT_COLOR | COGL_BUFFER_BIT_STENCIL,
                            0, 0, 0, 1);

  cogl_pipeline_set_layer_texture (base_pipeline, 0, state->texture);

  cogl_pipeline_set_layer_filters (base_pipeline, 0,
                                   COGL_PIPELINE_FILTER_NEAREST,
                                   COGL_PIPELINE_FILTER_NEAREST);

  /* Render the scene eight times to test all of the combinations of
     cull face mode and winding orders */
  for (draw_num = 0; draw_num < 8; draw_num++)
    {
      float x1 = 0, x2, y1 = 0, y2 = (float)(TEXTURE_RENDER_SIZE);
      CoglTextureVertex verts[4];
      CoglPipeline *pipeline;

      cogl_framebuffer_push_matrix (framebuffer);
      cogl_framebuffer_translate (framebuffer,
                                  0, TEXTURE_RENDER_SIZE * draw_num, 0);

      pipeline = cogl_pipeline_copy (base_pipeline);

      cogl_pipeline_set_front_face_winding (pipeline, FRONT_WINDING (draw_num));
      cogl_pipeline_set_cull_face_mode (pipeline, CULL_FACE_MODE (draw_num));

      memset (verts, 0, sizeof (verts));

      x2 = x1 + (float)(TEXTURE_RENDER_SIZE);

      /* Draw a front-facing texture */
      cogl_framebuffer_draw_rectangle (framebuffer, pipeline, x1, y1, x2, y2);

      x1 = x2;
      x2 = x1 + (float)(TEXTURE_RENDER_SIZE);

      /* Draw a front-facing texture with flipped texcoords */
      cogl_framebuffer_draw_textured_rectangle (framebuffer,
                                                pipeline,
                                                x1, y1, x2, y2,
                                                1.0, 0.0, 0.0, 1.0);

      x1 = x2;
      x2 = x1 + (float)(TEXTURE_RENDER_SIZE);

      /* Draw a back-facing texture */
      cogl_framebuffer_draw_rectangle (framebuffer, pipeline, x2, y1, x1, y2);

      cogl_framebuffer_pop_matrix (framebuffer);

      cogl_object_unref (pipeline);
    }

  cogl_object_unref (base_pipeline);
}

static void
ensure_xfixes_cursor (MetaCursorTracker *tracker)
{
  MetaDisplay *display = meta_get_display ();
  XFixesCursorImage *cursor_image;
  CoglTexture2D *sprite;
  guint8 *cursor_data;
  gboolean free_cursor_data;
  CoglContext *ctx;
  CoglError *error = NULL;

  if (tracker->xfixes_cursor)
    return;

  cursor_image = XFixesGetCursorImage (display->xdisplay);
  if (!cursor_image)
    return;

  /* Like all X APIs, XFixesGetCursorImage() returns arrays of 32-bit
   * quantities as arrays of long; we need to convert on 64 bit */
  if (sizeof(long) == 4)
    {
      cursor_data = (guint8 *)cursor_image->pixels;
      free_cursor_data = FALSE;
    }
  else
    {
      int i, j;
      guint32 *cursor_words;
      gulong *p;
      guint32 *q;

      cursor_words = g_new (guint32, cursor_image->width * cursor_image->height);
      cursor_data = (guint8 *)cursor_words;

      p = cursor_image->pixels;
      q = cursor_words;
      for (j = 0; j < cursor_image->height; j++)
        for (i = 0; i < cursor_image->width; i++)
          *(q++) = *(p++);

      free_cursor_data = TRUE;
    }

  ctx = clutter_backend_get_cogl_context (clutter_get_default_backend ());
  sprite = cogl_texture_2d_new_from_data (ctx,
                                          cursor_image->width,
                                          cursor_image->height,
                                          CLUTTER_CAIRO_FORMAT_ARGB32,
                                          cursor_image->width * 4, /* stride */
                                          cursor_data,
                                          &error);

  if (free_cursor_data)
    g_free (cursor_data);

  if (error != NULL)
    {
      meta_warning ("Failed to allocate cursor sprite texture: %s\n", error->message);
      cogl_error_free (error);
    }

  if (sprite != NULL)
    {
      MetaCursorSprite *cursor_sprite = meta_cursor_sprite_new ();
      meta_cursor_sprite_set_texture (cursor_sprite,
                                      sprite,
                                      cursor_image->xhot,
                                      cursor_image->yhot);
      cogl_object_unref (sprite);
      tracker->xfixes_cursor = cursor_sprite;
    }
  XFree (cursor_image);
}

int
main (int argc, char *argv[])
{
  CoglTexture *tex;
  CoglOnscreen *onscreen;
  GSource *cogl_source;
  GMainLoop *loop;
  Data data;
  int i;

  data.context = cogl_context_new (NULL, NULL);

  create_primitive (&data);

  data.pipeline = cogl_pipeline_new (data.context);
  data.last_spark_time = g_timer_new ();
  data.next_spark_num = 0;
  cogl_pipeline_set_point_size (data.pipeline, TEXTURE_SIZE);

  tex = generate_round_texture (data.context);
  cogl_pipeline_set_layer_texture (data.pipeline, 0, tex);
  cogl_object_unref (tex);

  cogl_pipeline_set_layer_point_sprite_coords_enabled (data.pipeline,
                                                       0, /* layer */
                                                       TRUE,
                                                       NULL /* error */);

  for (i = 0; i < N_FIREWORKS; i++)
    {
      data.fireworks[i].x = -FLT_MAX;
      data.fireworks[i].y = FLT_MAX;
      data.fireworks[i].size = 0.0f;
      data.fireworks[i].timer = g_timer_new ();
    }

  for (i = 0; i < N_SPARKS; i++)
    {
      data.sparks[i].x = 2.0f;
      data.sparks[i].y = 2.0f;
    }

  onscreen = cogl_onscreen_new (data.context, 800, 600);
  cogl_onscreen_show (onscreen);
  data.fb = onscreen;

  cogl_source = cogl_glib_source_new (data.context, G_PRIORITY_DEFAULT);

  g_source_attach (cogl_source, NULL);

  cogl_onscreen_add_frame_callback (onscreen,
                                    frame_event_cb,
                                    &data,
                                    NULL /* destroy notify */);

  loop = g_main_loop_new (NULL, TRUE);

  paint (&data);

  g_main_loop_run (loop);

  g_main_loop_unref (loop);

  g_source_destroy (cogl_source);

  cogl_object_unref (data.pipeline);
  cogl_object_unref (data.attribute_buffer);
  cogl_object_unref (data.primitive);
  cogl_object_unref (onscreen);
  cogl_object_unref (data.context);

  g_timer_destroy (data.last_spark_time);

  for (i = 0; i < N_FIREWORKS; i++)
    g_timer_destroy (data.fireworks[i].timer);

  return 0;
}

static void
test_byte_verts (TestState *state, int offset_x, int offset_y)
{
  CoglAttribute *attributes[2];
  CoglAttributeBuffer *buffer, *unnorm_buffer;
  CoglPrimitive *primitive;

  static const ByteVert norm_verts[] =
    {
      { 0, 10, /**/ 255, 0, 0, 255 },
      { 10, 10, /**/ 255, 0, 0, 255 },
      { 5, 0, /**/ 255, 0, 0, 255 },

      { 10, 10, /**/ 0, 255, 0, 255 },
      { 20, 10, /**/ 0, 255, 0, 255 },
      { 15, 0, /**/ 0, 255, 0, 255 }
    };

  static const ByteVert unnorm_verts[] =
    {
      { 0, 0, /**/ 0, 0, 1, 1 },
      { 0, 0, /**/ 0, 0, 1, 1 },
      { 0, 0, /**/ 0, 0, 1, 1 },
    };

  buffer = cogl_attribute_buffer_new (test_ctx,
                                      sizeof (norm_verts), norm_verts);
  attributes[0] = cogl_attribute_new (buffer,
                                      "cogl_position_in",
                                      sizeof (ByteVert),
                                      G_STRUCT_OFFSET (ByteVert, x),
                                      2, /* n_components */
                                      COGL_ATTRIBUTE_TYPE_SHORT);
  attributes[1] = cogl_attribute_new (buffer,
                                      "color",
                                      sizeof (ByteVert),
                                      G_STRUCT_OFFSET (ByteVert, r),
                                      4, /* n_components */
                                      COGL_ATTRIBUTE_TYPE_UNSIGNED_BYTE);
  cogl_attribute_set_normalized (attributes[1], TRUE);

  cogl_framebuffer_push_matrix (test_fb);
  cogl_framebuffer_translate (test_fb, offset_x, offset_y, 0.0f);

  primitive = cogl_primitive_new_with_attributes (COGL_VERTICES_MODE_TRIANGLES,
                                                  6, /* n_vertices */
                                                  attributes,
                                                  2); /* n_attributes */
  cogl_primitive_draw (primitive, test_fb, state->pipeline);
  cogl_object_unref (primitive);

  cogl_object_unref (attributes[1]);

  /* Test again with unnormalized attributes */
  unnorm_buffer = cogl_attribute_buffer_new (test_ctx,
                                             sizeof (unnorm_verts),
                                             unnorm_verts);
  attributes[1] = cogl_attribute_new (unnorm_buffer,
                                      "color",
                                      sizeof (ByteVert),
                                      G_STRUCT_OFFSET (ByteVert, r),
                                      4, /* n_components */
                                      COGL_ATTRIBUTE_TYPE_BYTE);

  cogl_framebuffer_translate (test_fb, 20, 0, 0);

  primitive = cogl_primitive_new_with_attributes (COGL_VERTICES_MODE_TRIANGLES,
                                                  3, /* n_vertices */
                                                  attributes,
                                                  2); /* n_attributes */
  cogl_primitive_draw (primitive, test_fb, state->pipeline);
  cogl_object_unref (primitive);

  cogl_framebuffer_pop_matrix (test_fb);

  cogl_object_unref (attributes[0]);
  cogl_object_unref (attributes[1]);
  cogl_object_unref (buffer);
  cogl_object_unref (unnorm_buffer);

  test_utils_check_pixel (test_fb, offset_x + 5, offset_y + 5, 0xff0000ff);
  test_utils_check_pixel (test_fb, offset_x + 15, offset_y + 5, 0x00ff00ff);
  test_utils_check_pixel (test_fb, offset_x + 25, offset_y + 5, 0x0000ffff);
}

void
cogl_handle_unref (CoglHandle handle)
{
  cogl_object_unref (handle);
}

//.........这里部分代码省略.........
      float y_2 = clip->y + clip->height;
      float quad[8] = {
        x_1, y_1,
        x_2, y_1,
        x_2, y_2,
        x_1, y_2
      };
      CoglMatrix modelview;

      if (outline == NULL)
        {
          outline = cogl_material_new ();
          cogl_material_set_color4ub (outline, 0xff, 0x00, 0x00, 0xff);
        }

      vbo = cogl_vertex_buffer_new (4);
      cogl_vertex_buffer_add (vbo,
                              "gl_Vertex",
                              2, /* n_components */
                              COGL_ATTRIBUTE_TYPE_FLOAT,
                              FALSE, /* normalized */
                              0, /* stride */
                              quad);
      cogl_vertex_buffer_submit (vbo);

      cogl_push_matrix ();
      cogl_matrix_init_identity (&modelview);
      _clutter_actor_apply_modelview_transform (actor, &modelview);
      cogl_set_modelview_matrix (&modelview);
      cogl_set_source (outline);
      cogl_vertex_buffer_draw (vbo, COGL_VERTICES_MODE_LINE_LOOP,
                               0 , 4);
      cogl_pop_matrix ();
      cogl_object_unref (vbo);
    }

  cogl_flush ();
  CLUTTER_TIMER_STOP (_clutter_uprof_context, painting_timer);

  drawable = stage_glx->glxwin
           ? stage_glx->glxwin
           : stage_x11->xwin;

  /* If we might ever use _clutter_backend_glx_blit_sub_buffer then we
   * always need to keep track of the video_sync_count so that we can
   * throttle blits.
   *
   * Note: we get the count *before* we issue any glXCopySubBuffer or
   * blit_sub_buffer request in case the count would go up before
   * returning control to us.
   */
  if (backend_glx->can_blit_sub_buffer && backend_glx->get_video_sync)
    backend_glx->get_video_sync (&video_sync_count);

  /* push on the screen */
  if (use_clipped_redraw)
    {
      ClutterGeometry *clip = &stage_glx->bounding_redraw_clip;
      ClutterGeometry copy_area;
      ClutterActor *actor;

      CLUTTER_NOTE (BACKEND,
                    "_glx_blit_sub_buffer (window: 0x%lx, "
                                          "x: %d, y: %d, "
                                          "width: %d, height: %d)",
                    (unsigned long) drawable,

CoglPipeline *
_st_create_shadow_pipeline_from_actor (StShadow     *shadow_spec,
                                       ClutterActor *actor)
{
  CoglPipeline *shadow_pipeline = NULL;

  if (CLUTTER_IS_TEXTURE (actor))
    {
      CoglTexture *texture;

      texture = clutter_texture_get_cogl_texture (CLUTTER_TEXTURE (actor));
      shadow_pipeline = _st_create_shadow_pipeline (shadow_spec, texture);
    }
  else
    {
      CoglTexture *buffer;
      CoglOffscreen *offscreen;
      CoglFramebuffer *fb;
      ClutterActorBox box;
      CoglColor clear_color;
      float width, height;
      CoglError *catch_error = NULL;

      clutter_actor_get_allocation_box (actor, &box);
      clutter_actor_box_get_size (&box, &width, &height);

      if (width == 0 || height == 0)
        return NULL;

      buffer = cogl_texture_new_with_size (width,
                                           height,
                                           COGL_TEXTURE_NO_SLICING,
                                           COGL_PIXEL_FORMAT_ANY);

      if (buffer == NULL)
        return NULL;

      offscreen = cogl_offscreen_new_with_texture (buffer);
      fb = COGL_FRAMEBUFFER (offscreen);

      if (!cogl_framebuffer_allocate (fb, &catch_error))
        {
          cogl_error_free (catch_error);
          cogl_object_unref (buffer);
          return NULL;
        }

      cogl_color_init_from_4ub (&clear_color, 0, 0, 0, 0);

      /* XXX: There's no way to render a ClutterActor to an offscreen
       * as it uses the implicit API. */
      G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
      cogl_push_framebuffer (fb);
      G_GNUC_END_IGNORE_DEPRECATIONS;

      cogl_framebuffer_clear (fb, COGL_BUFFER_BIT_COLOR, &clear_color);
      cogl_framebuffer_translate (fb, -box.x1, -box.y1, 0);
      cogl_framebuffer_orthographic (fb, 0, 0, width, height, 0, 1.0);

      clutter_actor_set_opacity_override (actor, 255);
      clutter_actor_paint (actor);
      clutter_actor_set_opacity_override (actor, -1);

      G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
      cogl_pop_framebuffer ();
      G_GNUC_END_IGNORE_DEPRECATIONS;

      cogl_object_unref (fb);

      shadow_pipeline = _st_create_shadow_pipeline (shadow_spec, buffer);

      cogl_object_unref (buffer);
    }

  return shadow_pipeline;
}

static CoglBool
draw_rectangle (TestState *state,
                int x,
                int y,
                TestDepthState *rect_state,
                CoglBool legacy_mode)
{
  uint8_t Cr = MASK_RED (rect_state->color);
  uint8_t Cg = MASK_GREEN (rect_state->color);
  uint8_t Cb = MASK_BLUE (rect_state->color);
  uint8_t Ca = MASK_ALPHA (rect_state->color);
  CoglPipeline *pipeline;
  CoglDepthState depth_state;

  cogl_depth_state_init (&depth_state);
  cogl_depth_state_set_test_enabled (&depth_state, rect_state->test_enable);
  cogl_depth_state_set_test_function (&depth_state, rect_state->test_function);
  cogl_depth_state_set_write_enabled (&depth_state, rect_state->write_enable);
  cogl_depth_state_set_range (&depth_state,
                              rect_state->range_near,
                              rect_state->range_far);

  pipeline = cogl_pipeline_new (test_ctx);
  if (!cogl_pipeline_set_depth_state (pipeline, &depth_state, NULL))
    {
      cogl_object_unref (pipeline);
      return FALSE;
    }

  if (!legacy_mode)
    {
      cogl_pipeline_set_color4ub (pipeline, Cr, Cg, Cb, Ca);

      cogl_framebuffer_set_depth_write_enabled (test_fb,
                                                rect_state->fb_write_enable);
      cogl_framebuffer_push_matrix (test_fb);
      cogl_framebuffer_translate (test_fb, 0, 0, rect_state->depth);
      cogl_framebuffer_draw_rectangle (test_fb,
                                       pipeline,
                                       x * QUAD_WIDTH,
                                       y * QUAD_WIDTH,
                                       x * QUAD_WIDTH + QUAD_WIDTH,
                                       y * QUAD_WIDTH + QUAD_WIDTH);
      cogl_framebuffer_pop_matrix (test_fb);
    }
  else
    {
      cogl_push_framebuffer (test_fb);
      cogl_push_matrix ();
      cogl_set_source_color4ub (Cr, Cg, Cb, Ca);
      cogl_translate (0, 0, rect_state->depth);
      cogl_rectangle (x * QUAD_WIDTH,
                      y * QUAD_WIDTH,
                      x * QUAD_WIDTH + QUAD_WIDTH,
                      y * QUAD_WIDTH + QUAD_WIDTH);
      cogl_pop_matrix ();
      cogl_pop_framebuffer ();
    }

  cogl_object_unref (pipeline);

  return TRUE;
}

void
_cogl_matrix_stack_destroy_cache (CoglMatrixStackCache *cache)
{
  if (cache->stack)
    cogl_object_unref (cache->stack);
}

//.........这里部分代码省略.........
         _cogl_atlas_compare_size_cb);

  /* Try to create a new atlas that can contain all of the textures */
  if (atlas->map)
    {
      map_width = _cogl_rectangle_map_get_width (atlas->map);
      map_height = _cogl_rectangle_map_get_height (atlas->map);

      /* If there is enough space in for the new rectangle in the
         existing atlas with at least 6% waste we'll start with the
         same size, otherwise we'll immediately double it */
      if ((map_width * map_height -
           _cogl_rectangle_map_get_remaining_space (atlas->map) +
           width * height) * 53 / 50 >
          map_width * map_height)
        _cogl_atlas_get_next_size (&map_width, &map_height);
    }
  else
    _cogl_atlas_get_initial_size (atlas->texture_format,
                                  &map_width, &map_height);

  new_map = _cogl_atlas_create_map (atlas->texture_format,
                                    map_width, map_height,
                                    data.n_textures, data.textures);

  /* If we can't create a map with the texture then give up */
  if (new_map == NULL)
    {
      COGL_NOTE (ATLAS, "%p: Could not fit texture in the atlas", atlas);
      ret = FALSE;
    }
  /* We need to migrate the existing textures into a new texture */
  else if ((new_tex = _cogl_atlas_create_texture
            (atlas,
             _cogl_rectangle_map_get_width (new_map),
             _cogl_rectangle_map_get_height (new_map))) == NULL)
    {
      COGL_NOTE (ATLAS, "%p: Could not create a CoglTexture2D", atlas);
      _cogl_rectangle_map_free (new_map);
      ret = FALSE;
    }
  else
    {
      int waste;

      COGL_NOTE (ATLAS,
                 "%p: Atlas %s with size %ix%i",
                 atlas,
                 atlas->map == NULL ||
                 _cogl_rectangle_map_get_width (atlas->map) !=
                 _cogl_rectangle_map_get_width (new_map) ||
                 _cogl_rectangle_map_get_height (atlas->map) !=
                 _cogl_rectangle_map_get_height (new_map) ?
                 "resized" : "reorganized",
                 _cogl_rectangle_map_get_width (new_map),
                 _cogl_rectangle_map_get_height (new_map));

      if (atlas->map)
        {
          /* Move all the textures to the right position in the new
             texture. This will also update the texture's rectangle */
          _cogl_atlas_migrate (atlas,
                               data.n_textures,
                               data.textures,
                               atlas->texture,
                               COGL_TEXTURE (new_tex),
                               user_data);
          _cogl_rectangle_map_free (atlas->map);
          cogl_object_unref (atlas->texture);
        }
      else
        /* We know there's only one texture so we can just directly
           update the rectangle from its new position */
        atlas->update_position_cb (data.textures[0].user_data,
                                   COGL_TEXTURE (new_tex),
                                   &data.textures[0].new_position);

      atlas->map = new_map;
      atlas->texture = COGL_TEXTURE (new_tex);

      waste = (_cogl_rectangle_map_get_remaining_space (atlas->map) *
               100 / (_cogl_rectangle_map_get_width (atlas->map) *
                      _cogl_rectangle_map_get_height (atlas->map)));

      COGL_NOTE (ATLAS, "%p: Atlas is %ix%i, has %i textures and is %i%% waste",
                 atlas,
                 _cogl_rectangle_map_get_width (atlas->map),
                 _cogl_rectangle_map_get_height (atlas->map),
                 _cogl_rectangle_map_get_n_rectangles (atlas->map),
                 waste);

      ret = TRUE;
    }

  g_free (data.textures);

  _cogl_atlas_notify_post_reorganize (atlas);

  return ret;
}

static CoglPrimitive *
primitive_new_p2t2t2 (CoglContext *ctx,
                      CoglVerticesMode mode,
                      int n_vertices,
                      const VertexP2T2T2 *data)
{
  CoglAttributeBuffer *attribute_buffer =
    cogl_attribute_buffer_new (ctx, n_vertices * sizeof (VertexP2T2T2), data);
  int n_attributes = 7;
  CoglAttribute *attributes[n_attributes];
  CoglPrimitive *primitive;
#ifndef MESA_CONST_ATTRIB_BUG_WORKAROUND
  const float normal[3] = { 0, 0, 1 };
  const float tangent[3] = { 1, 0, 0 };
#endif
  int i;

  attributes[0] = cogl_attribute_new (attribute_buffer,
                                      "cogl_position_in",
                                      sizeof (VertexP2T2T2),
                                      offsetof (VertexP2T2T2, x),
                                      2,
                                      COGL_ATTRIBUTE_TYPE_FLOAT);

  /* coords for circle mask, for rounded corners */
  attributes[1] = cogl_attribute_new (attribute_buffer,
                                      "cogl_tex_coord0_in",
                                      sizeof (VertexP2T2T2),
                                      offsetof (VertexP2T2T2, s0),
                                      2,
                                      COGL_ATTRIBUTE_TYPE_FLOAT);
  /* coords for primary texture */
  attributes[2] = cogl_attribute_new (attribute_buffer,
                                      "cogl_tex_coord1_in",
                                      sizeof (VertexP2T2T2),
                                      offsetof (VertexP2T2T2, s1),
                                      2,
                                      COGL_ATTRIBUTE_TYPE_FLOAT);
  /* coords for alpha mask texture */
  attributes[3] = cogl_attribute_new (attribute_buffer,
                                      "cogl_tex_coord4_in",
                                      sizeof (VertexP2T2T2),
                                      offsetof (VertexP2T2T2, s1),
                                      2,
                                      COGL_ATTRIBUTE_TYPE_FLOAT);

  /* coords for normal map */
  attributes[4] = cogl_attribute_new (attribute_buffer,
                                      "cogl_tex_coord7_in",
                                      sizeof (VertexP2T2T2),
                                      offsetof (VertexP2T2T2, s1),
                                      2,
                                      COGL_ATTRIBUTE_TYPE_FLOAT);

#ifdef MESA_CONST_ATTRIB_BUG_WORKAROUND
  attributes[5] = cogl_attribute_new (attribute_buffer,
                                      "cogl_normal_in",
                                      sizeof (VertexP2T2T2),
                                      offsetof (VertexP2T2T2, Nx),
                                      3,
                                      COGL_ATTRIBUTE_TYPE_FLOAT);
  attributes[6] = cogl_attribute_new (attribute_buffer,
                                      "tangent_in",
                                      sizeof (VertexP2T2T2),
                                      offsetof (VertexP2T2T2, Tx),
                                      3,
                                      COGL_ATTRIBUTE_TYPE_FLOAT);
#else
  attributes[5] = cogl_attribute_new_const_3fv (ctx,
                                                "cogl_normal_in",
                                                normal);

  attributes[6] = cogl_attribute_new_const_3fv (ctx,
                                                "tangent_in",
                                                tangent);
#endif

  cogl_object_unref (attribute_buffer);

  primitive = cogl_primitive_new_with_attributes (mode,
                                                  n_vertices,
                                                  attributes,
                                                  n_attributes);

  for (i = 0; i < n_attributes; i++)
    cogl_object_unref (attributes[i]);

  return primitive;
}

static CoglTexture *
_cogl_texture_new_from_bitmap (CoglBitmap *bitmap,
                               CoglTextureFlags flags,
                               CoglPixelFormat internal_format,
                               CoglBool can_convert_in_place,
                               CoglError **error)
{
  CoglContext *ctx = _cogl_bitmap_get_context (bitmap);
  CoglTexture *tex;
  CoglError *internal_error = NULL;

  if (!flags &&
      !COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_ATLAS))
    {
      /* First try putting the texture in the atlas */
      CoglAtlasTexture *atlas_tex =
        _cogl_atlas_texture_new_from_bitmap (bitmap,
                                             can_convert_in_place);

      _cogl_texture_set_internal_format (COGL_TEXTURE (atlas_tex),
                                         internal_format);

      if (cogl_texture_allocate (COGL_TEXTURE (atlas_tex), &internal_error))
        return COGL_TEXTURE (atlas_tex);

      cogl_error_free (internal_error);
      internal_error = NULL;
      cogl_object_unref (atlas_tex);
    }

  /* If that doesn't work try a fast path 2D texture */
  if ((_cogl_util_is_pot (bitmap->width) &&
       _cogl_util_is_pot (bitmap->height)) ||
      (cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_NPOT_BASIC) &&
       cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_NPOT_MIPMAP)))
    {
      tex = COGL_TEXTURE (_cogl_texture_2d_new_from_bitmap (bitmap,
                                                            can_convert_in_place));

      _cogl_texture_set_internal_format (tex, internal_format);

      if (!cogl_texture_allocate (tex, &internal_error))
        {
          cogl_error_free (internal_error);
          internal_error = NULL;
          cogl_object_unref (tex);
          tex = NULL;
        }
    }
  else
    tex = NULL;

  if (!tex)
    {
      /* Otherwise create a sliced texture */
      int max_waste = flags & COGL_TEXTURE_NO_SLICING ? -1 : COGL_TEXTURE_MAX_WASTE;
      tex = COGL_TEXTURE (_cogl_texture_2d_sliced_new_from_bitmap (bitmap,
                                                             max_waste,
                                                             can_convert_in_place));

      _cogl_texture_set_internal_format (tex, internal_format);

      if (!cogl_texture_allocate (tex, error))
        {
          cogl_object_unref (tex);
          tex = NULL;
        }
    }

  if (tex &&
      flags & COGL_TEXTURE_NO_AUTO_MIPMAP)
    {
      cogl_meta_texture_foreach_in_region (COGL_META_TEXTURE (tex),
                                           0, 0, 1, 1,
                                           COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE,
                                           COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE,
                                           set_auto_mipmap_cb,
                                           NULL);
    }

  return tex;
}

//.........这里部分代码省略.........
    {
      /* If we haven't already created a derived pipeline... */
      if (!copy)
        {
          copy = cogl_pipeline_copy (pipeline);
          pipeline = copy;
        }
      _cogl_pipeline_apply_overrides (pipeline, &layers_state->options);

      /* TODO:
       * overrides = cogl_pipeline_get_data (pipeline,
       *                                     last_overrides_key);
       * if (overrides)
       *   {
       *     age = cogl_pipeline_get_age (pipeline);
       *     XXX: actually we also need to check for legacy_state
       *     and blending overrides for use of glColorPointer...
       *     if (overrides->ags != age ||
       *         memcmp (&overrides->options, &options,
       *                 sizeof (options) != 0)
       *       {
       *         cogl_object_unref (overrides->weak_pipeline);
       *         g_slice_free (Overrides, overrides);
       *         overrides = NULL;
       *       }
       *   }
       * if (!overrides)
       *   {
       *     overrides = g_slice_new (Overrides);
       *     overrides->weak_pipeline =
       *       cogl_pipeline_weak_copy (pipeline);
       *     _cogl_pipeline_apply_overrides (overrides->weak_pipeline,
       *                                     &options);
       *
       *     cogl_pipeline_set_data (pipeline, last_overrides_key,
       *                             weak_overrides,
       *                             free_overrides_cb,
       *                             NULL);
       *   }
       * pipeline = overrides->weak_pipeline;
       */
    }

  _cogl_pipeline_flush_gl_state (ctx,
                                 pipeline,
                                 framebuffer,
                                 with_color_attrib,
                                 unknown_color_alpha);

  _cogl_bitmask_clear_all (&ctx->enable_builtin_attributes_tmp);
  _cogl_bitmask_clear_all (&ctx->enable_texcoord_attributes_tmp);
  _cogl_bitmask_clear_all (&ctx->enable_custom_attributes_tmp);

  /* Bind the attribute pointers. We need to do this after the
   * pipeline is flushed because when using GLSL that is the only
   * point when we can determine the attribute locations */

  for (i = 0; i < n_attributes; i++)
    {
      CoglAttribute *attribute = attributes[i];
      CoglAttributeBuffer *attribute_buffer;
      CoglBuffer *buffer;
      uint8_t *base;

      if (attribute->is_buffered)
        {
          attribute_buffer = cogl_attribute_get_buffer (attribute);
          buffer = COGL_BUFFER (attribute_buffer);

          /* Note: we don't try and catch errors with binding buffers
           * here since OOM errors at this point indicate that nothing
           * has yet been uploaded to attribute