cc/layers/nine_patch_layer_impl.cc

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/layers/nine_patch_layer_impl.h"
   6
   7 #include "base/strings/stringprintf.h"
   8 #include "base/values.h"
   9 #include "cc/base/math_util.h"
  10 #include "cc/quads/texture_draw_quad.h"
  11 #include "cc/trees/layer_tree_impl.h"
  12 #include "cc/trees/occlusion_tracker.h"
  13 #include "ui/gfx/rect_f.h"
  14
  15 namespace cc {
  16
  17 NinePatchLayerImpl::NinePatchLayerImpl(LayerTreeImpl* tree_impl, int id)
  18     : UIResourceLayerImpl(tree_impl, id),
  19       fill_center_(false) {}
  20
  21 NinePatchLayerImpl::~NinePatchLayerImpl() {}
  22
  23 scoped_ptr<LayerImpl> NinePatchLayerImpl::CreateLayerImpl(
  24     LayerTreeImpl* tree_impl) {
  25   return NinePatchLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
  26 }
  27
  28 void NinePatchLayerImpl::PushPropertiesTo(LayerImpl* layer) {
  29   UIResourceLayerImpl::PushPropertiesTo(layer);
  30   NinePatchLayerImpl* layer_impl = static_cast<NinePatchLayerImpl*>(layer);
  31
  32   layer_impl->SetLayout(image_aperture_, border_, fill_center_);
  33 }
  34
  35 static gfx::RectF NormalizedRect(float x,
  36                                  float y,
  37                                  float width,
  38                                  float height,
  39                                  float total_width,
  40                                  float total_height) {
  41   return gfx::RectF(x / total_width,
  42                     y / total_height,
  43                     width / total_width,
  44                     height / total_height);
  45 }
  46
  47 void NinePatchLayerImpl::SetLayout(const gfx::Rect& aperture,
  48                                    const gfx::Rect& border,
  49                                    bool fill_center) {
  50   // This check imposes an ordering on the call sequence.  An UIResource must
  51   // exist before SetLayout can be called.
  52   DCHECK(ui_resource_id_);
  53
  54   if (image_aperture_ == aperture &&
  55       border_ == border && fill_center_ == fill_center)
  56     return;
  57
  58   image_aperture_ = aperture;
  59   border_ = border;
  60   fill_center_ = fill_center;
  61
  62   NoteLayerPropertyChanged();
  63 }
  64
  65 void NinePatchLayerImpl::CheckGeometryLimitations() {
  66   // |border| is in layer space.  It cannot exceed the bounds of the layer.
  67   DCHECK_GE(bounds().width(), border_.width());
  68   DCHECK_GE(bounds().height(), border_.height());
  69
  70   // Sanity Check on |border|
  71   DCHECK_LE(border_.x(), border_.width());
  72   DCHECK_LE(border_.y(), border_.height());
  73   DCHECK_GE(border_.x(), 0);
  74   DCHECK_GE(border_.y(), 0);
  75
  76   // |aperture| is in image space.  It cannot exceed the bounds of the bitmap.
  77   DCHECK(!image_aperture_.size().IsEmpty());
  78   DCHECK(gfx::Rect(image_bounds_).Contains(image_aperture_))
  79       << "image_bounds_ " << gfx::Rect(image_bounds_).ToString()
  80       << " image_aperture_ " << image_aperture_.ToString();
  81 }
  82
  83 void NinePatchLayerImpl::AppendQuads(
  84     RenderPass* render_pass,
  85     const OcclusionTracker<LayerImpl>& occlusion_tracker,
  86     AppendQuadsData* append_quads_data) {
  87   CheckGeometryLimitations();
  88   SharedQuadState* shared_quad_state =
  89       render_pass->CreateAndAppendSharedQuadState();
  90   PopulateSharedQuadState(shared_quad_state);
  91
  92   AppendDebugBorderQuad(
  93       render_pass, content_bounds(), shared_quad_state, append_quads_data);
  94
  95   if (!ui_resource_id_)
  96     return;
  97
  98   ResourceProvider::ResourceId resource =
  99       layer_tree_impl()->ResourceIdForUIResource(ui_resource_id_);
 100
 101   if (!resource)
 102     return;
 103
 104   static const bool flipped = false;
 105   static const bool premultiplied_alpha = true;
 106
 107   DCHECK(!bounds().IsEmpty());
 108
 109   // NinePatch border widths in layer space.
 110   int layer_left_width = border_.x();
 111   int layer_top_height = border_.y();
 112   int layer_right_width = border_.width() - layer_left_width;
 113   int layer_bottom_height = border_.height() - layer_top_height;
 114
 115   int layer_middle_width = bounds().width() - border_.width();
 116   int layer_middle_height = bounds().height() - border_.height();
 117
 118   // Patch positions in layer space
 119   gfx::Rect layer_top_left(0, 0, layer_left_width, layer_top_height);
 120   gfx::Rect layer_top_right(bounds().width() - layer_right_width,
 121                             0,
 122                             layer_right_width,
 123                             layer_top_height);
 124   gfx::Rect layer_bottom_left(0,
 125                               bounds().height() - layer_bottom_height,
 126                               layer_left_width,
 127                               layer_bottom_height);
 128   gfx::Rect layer_bottom_right(layer_top_right.x(),
 129                                layer_bottom_left.y(),
 130                                layer_right_width,
 131                                layer_bottom_height);
 132   gfx::Rect layer_top(
 133       layer_top_left.right(), 0, layer_middle_width, layer_top_height);
 134   gfx::Rect layer_left(
 135       0, layer_top_left.bottom(), layer_left_width, layer_middle_height);
 136   gfx::Rect layer_right(layer_top_right.x(),
 137                         layer_top_right.bottom(),
 138                         layer_right_width,
 139                         layer_left.height());
 140   gfx::Rect layer_bottom(layer_top.x(),
 141                          layer_bottom_left.y(),
 142                          layer_top.width(),
 143                          layer_bottom_height);
 144   gfx::Rect layer_center(layer_left_width,
 145                          layer_top_height,
 146                          layer_middle_width,
 147                          layer_middle_height);
 148
 149   // Note the following values are in image (bitmap) space.
 150   float image_width = image_bounds_.width();
 151   float image_height = image_bounds_.height();
 152
 153   int image_aperture_left_width = image_aperture_.x();
 154   int image_aperture_top_height = image_aperture_.y();
 155   int image_aperture_right_width = image_width - image_aperture_.right();
 156   int image_aperture_bottom_height = image_height - image_aperture_.bottom();
 157   // Patch positions in bitmap UV space (from zero to one)
 158   gfx::RectF uv_top_left = NormalizedRect(0,
 159                                           0,
 160                                           image_aperture_left_width,
 161                                           image_aperture_top_height,
 162                                           image_width,
 163                                           image_height);
 164   gfx::RectF uv_top_right =
 165       NormalizedRect(image_width - image_aperture_right_width,
 166                      0,
 167                      image_aperture_right_width,
 168                      image_aperture_top_height,
 169                      image_width,
 170                      image_height);
 171   gfx::RectF uv_bottom_left =
 172       NormalizedRect(0,
 173                      image_height - image_aperture_bottom_height,
 174                      image_aperture_left_width,
 175                      image_aperture_bottom_height,
 176                      image_width,
 177                      image_height);
 178   gfx::RectF uv_bottom_right =
 179       NormalizedRect(image_width - image_aperture_right_width,
 180                      image_height - image_aperture_bottom_height,
 181                      image_aperture_right_width,
 182                      image_aperture_bottom_height,
 183                      image_width,
 184                      image_height);
 185   gfx::RectF uv_top(
 186       uv_top_left.right(),
 187       0,
 188       (image_width - image_aperture_left_width - image_aperture_right_width) /
 189           image_width,
 190       (image_aperture_top_height) / image_height);
 191   gfx::RectF uv_left(0,
 192                      uv_top_left.bottom(),
 193                      image_aperture_left_width / image_width,
 194                      (image_height - image_aperture_top_height -
 195                       image_aperture_bottom_height) /
 196                          image_height);
 197   gfx::RectF uv_right(uv_top_right.x(),
 198                       uv_top_right.bottom(),
 199                       image_aperture_right_width / image_width,
 200                       uv_left.height());
 201   gfx::RectF uv_bottom(uv_top.x(),
 202                        uv_bottom_left.y(),
 203                        uv_top.width(),
 204                        image_aperture_bottom_height / image_height);
 205   gfx::RectF uv_center(uv_top_left.right(),
 206                        uv_top_left.bottom(),
 207                        uv_top.width(),
 208                        uv_left.height());
 209
 210   // Nothing is opaque here.
 211   // TODO(danakj): Should we look at the SkBitmaps to determine opaqueness?
 212   gfx::Rect opaque_rect;
 213   gfx::Rect visible_rect;
 214   const float vertex_opacity[] = {1.0f, 1.0f, 1.0f, 1.0f};
 215
 216   visible_rect =
 217       occlusion_tracker.UnoccludedContentRect(layer_top_left, draw_transform());
 218   if (!visible_rect.IsEmpty()) {
 219     TextureDrawQuad* quad =
 220         render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
 221     quad->SetNew(shared_quad_state,
 222                  layer_top_left,
 223                  opaque_rect,
 224                  visible_rect,
 225                  resource,
 226                  premultiplied_alpha,
 227                  uv_top_left.origin(),
 228                  uv_top_left.bottom_right(),
 229                  SK_ColorTRANSPARENT,
 230                  vertex_opacity,
 231                  flipped);
 232   }
 233
 234   visible_rect = occlusion_tracker.UnoccludedContentRect(layer_top_right,
 235                                                          draw_transform());
 236   if (!visible_rect.IsEmpty()) {
 237     TextureDrawQuad* quad =
 238         render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
 239     quad->SetNew(shared_quad_state,
 240                  layer_top_right,
 241                  opaque_rect,
 242                  visible_rect,
 243                  resource,
 244                  premultiplied_alpha,
 245                  uv_top_right.origin(),
 246                  uv_top_right.bottom_right(),
 247                  SK_ColorTRANSPARENT,
 248                  vertex_opacity,
 249                  flipped);
 250   }
 251
 252   visible_rect = occlusion_tracker.UnoccludedContentRect(layer_bottom_left,
 253                                                          draw_transform());
 254   if (!visible_rect.IsEmpty()) {
 255     TextureDrawQuad* quad =
 256         render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
 257     quad->SetNew(shared_quad_state,
 258                  layer_bottom_left,
 259                  opaque_rect,
 260                  visible_rect,
 261                  resource,
 262                  premultiplied_alpha,
 263                  uv_bottom_left.origin(),
 264                  uv_bottom_left.bottom_right(),
 265                  SK_ColorTRANSPARENT,
 266                  vertex_opacity,
 267                  flipped);
 268   }
 269
 270   visible_rect = occlusion_tracker.UnoccludedContentRect(layer_bottom_right,
 271                                                          draw_transform());
 272   if (!visible_rect.IsEmpty()) {
 273     TextureDrawQuad* quad =
 274         render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
 275     quad->SetNew(shared_quad_state,
 276                  layer_bottom_right,
 277                  opaque_rect,
 278                  visible_rect,
 279                  resource,
 280                  premultiplied_alpha,
 281                  uv_bottom_right.origin(),
 282                  uv_bottom_right.bottom_right(),
 283                  SK_ColorTRANSPARENT,
 284                  vertex_opacity,
 285                  flipped);
 286   }
 287
 288   visible_rect =
 289       occlusion_tracker.UnoccludedContentRect(layer_top, draw_transform());
 290   if (!visible_rect.IsEmpty()) {
 291     TextureDrawQuad* quad =
 292         render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
 293     quad->SetNew(shared_quad_state,
 294                  layer_top,
 295                  opaque_rect,
 296                  visible_rect,
 297                  resource,
 298                  premultiplied_alpha,
 299                  uv_top.origin(),
 300                  uv_top.bottom_right(),
 301                  SK_ColorTRANSPARENT,
 302                  vertex_opacity,
 303                  flipped);
 304   }
 305
 306   visible_rect =
 307       occlusion_tracker.UnoccludedContentRect(layer_left, draw_transform());
 308   if (!visible_rect.IsEmpty()) {
 309     TextureDrawQuad* quad =
 310         render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
 311     quad->SetNew(shared_quad_state,
 312                  layer_left,
 313                  opaque_rect,
 314                  visible_rect,
 315                  resource,
 316                  premultiplied_alpha,
 317                  uv_left.origin(),
 318                  uv_left.bottom_right(),
 319                  SK_ColorTRANSPARENT,
 320                  vertex_opacity,
 321                  flipped);
 322   }
 323
 324   visible_rect =
 325       occlusion_tracker.UnoccludedContentRect(layer_right, draw_transform());
 326   if (!visible_rect.IsEmpty()) {
 327     TextureDrawQuad* quad =
 328         render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
 329     quad->SetNew(shared_quad_state,
 330                  layer_right,
 331                  opaque_rect,
 332                  layer_right,
 333                  resource,
 334                  premultiplied_alpha,
 335                  uv_right.origin(),
 336                  uv_right.bottom_right(),
 337                  SK_ColorTRANSPARENT,
 338                  vertex_opacity,
 339                  flipped);
 340   }
 341
 342   visible_rect =
 343       occlusion_tracker.UnoccludedContentRect(layer_bottom, draw_transform());
 344   if (!visible_rect.IsEmpty()) {
 345     TextureDrawQuad* quad =
 346         render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
 347     quad->SetNew(shared_quad_state,
 348                  layer_bottom,
 349                  opaque_rect,
 350                  visible_rect,
 351                  resource,
 352                  premultiplied_alpha,
 353                  uv_bottom.origin(),
 354                  uv_bottom.bottom_right(),
 355                  SK_ColorTRANSPARENT,
 356                  vertex_opacity,
 357                  flipped);
 358   }
 359
 360   if (fill_center_) {
 361     visible_rect =
 362         occlusion_tracker.UnoccludedContentRect(layer_center, draw_transform());
 363     if (!visible_rect.IsEmpty()) {
 364       TextureDrawQuad* quad =
 365           render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
 366       quad->SetNew(shared_quad_state,
 367                    layer_center,
 368                    opaque_rect,
 369                    visible_rect,
 370                    resource,
 371                    premultiplied_alpha,
 372                    uv_center.origin(),
 373                    uv_center.bottom_right(),
 374                    SK_ColorTRANSPARENT,
 375                    vertex_opacity,
 376                    flipped);
 377     }
 378   }
 379 }
 380
 381 const char* NinePatchLayerImpl::LayerTypeAsString() const {
 382   return "cc::NinePatchLayerImpl";
 383 }
 384
 385 base::DictionaryValue* NinePatchLayerImpl::LayerTreeAsJson() const {
 386   base::DictionaryValue* result = LayerImpl::LayerTreeAsJson();
 387
 388   base::ListValue* list = new base::ListValue;
 389   list->AppendInteger(image_aperture_.origin().x());
 390   list->AppendInteger(image_aperture_.origin().y());
 391   list->AppendInteger(image_aperture_.size().width());
 392   list->AppendInteger(image_aperture_.size().height());
 393   result->Set("ImageAperture", list);
 394
 395   list = new base::ListValue;
 396   list->AppendInteger(image_bounds_.width());
 397   list->AppendInteger(image_bounds_.height());
 398   result->Set("ImageBounds", list);
 399
 400   result->Set("Border", MathUtil::AsValue(border_).release());
 401
 402   base::FundamentalValue* fill_center =
 403       base::Value::CreateBooleanValue(fill_center_);
 404   result->Set("FillCenter", fill_center);
 405
 406   return result;
 407 }
 408
 409 }  // namespace cc