nine_patch_layer_impl.cc revision eb525c5499e34cc9c4b825d6d9e75bb07cc06ace 
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/layers/quad_sink.h"
10#include "cc/quads/texture_draw_quad.h"
11#include "ui/gfx/rect_f.h"
12
13namespace cc {
14
15NinePatchLayerImpl::NinePatchLayerImpl(LayerTreeImpl* tree_impl, int id)
16    : LayerImpl(tree_impl, id),
17      resource_id_(0) {}
18
19NinePatchLayerImpl::~NinePatchLayerImpl() {}
20
21ResourceProvider::ResourceId NinePatchLayerImpl::ContentsResourceId() const {
22  return 0;
23}
24
25scoped_ptr<LayerImpl> NinePatchLayerImpl::CreateLayerImpl(
26    LayerTreeImpl* tree_impl) {
27  return NinePatchLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
28}
29
30void NinePatchLayerImpl::PushPropertiesTo(LayerImpl* layer) {
31  LayerImpl::PushPropertiesTo(layer);
32  NinePatchLayerImpl* layer_impl = static_cast<NinePatchLayerImpl*>(layer);
33
34  if (!resource_id_)
35    return;
36
37  layer_impl->SetResourceId(resource_id_);
38  layer_impl->SetLayout(image_bounds_, image_aperture_);
39}
40
41static gfx::RectF NormalizedRect(float x,
42                                 float y,
43                                 float width,
44                                 float height,
45                                 float total_width,
46                                 float total_height) {
47  return gfx::RectF(x / total_width,
48                    y / total_height,
49                    width / total_width,
50                    height / total_height);
51}
52
53void NinePatchLayerImpl::SetLayout(gfx::Size image_bounds, gfx::Rect aperture) {
54  image_bounds_ = image_bounds;
55  image_aperture_ = aperture;
56}
57
58bool NinePatchLayerImpl::WillDraw(DrawMode draw_mode,
59                                  ResourceProvider* resource_provider) {
60  if (!resource_id_ || draw_mode == DRAW_MODE_RESOURCELESS_SOFTWARE)
61    return false;
62  return LayerImpl::WillDraw(draw_mode, resource_provider);
63}
64
65void NinePatchLayerImpl::AppendQuads(QuadSink* quad_sink,
66                                     AppendQuadsData* append_quads_data) {
67  DCHECK(resource_id_);
68
69  SharedQuadState* shared_quad_state =
70      quad_sink->UseSharedQuadState(CreateSharedQuadState());
71  AppendDebugBorderQuad(quad_sink, shared_quad_state, append_quads_data);
72
73  static const bool flipped = false;
74  static const bool premultiplied_alpha = true;
75
76  DCHECK(!bounds().IsEmpty());
77
78  // NinePatch border widths in bitmap pixel space
79  int left_width = image_aperture_.x();
80  int top_height = image_aperture_.y();
81  int right_width = image_bounds_.width() - image_aperture_.right();
82  int bottom_height = image_bounds_.height() - image_aperture_.bottom();
83
84  // If layer can't fit the corners, clip to show the outer edges of the
85  // image.
86  int corner_total_width = left_width + right_width;
87  int middle_width = bounds().width() - corner_total_width;
88  if (middle_width < 0) {
89    float left_width_proportion =
90        static_cast<float>(left_width) / corner_total_width;
91    int left_width_crop = middle_width * left_width_proportion;
92    left_width += left_width_crop;
93    right_width = bounds().width() - left_width;
94    middle_width = 0;
95  }
96  int corner_total_height = top_height + bottom_height;
97  int middle_height = bounds().height() - corner_total_height;
98  if (middle_height < 0) {
99    float top_height_proportion =
100        static_cast<float>(top_height) / corner_total_height;
101    int top_height_crop = middle_height * top_height_proportion;
102    top_height += top_height_crop;
103    bottom_height = bounds().height() - top_height;
104    middle_height = 0;
105  }
106
107  // Patch positions in layer space
108  gfx::Rect top_left(0, 0, left_width, top_height);
109  gfx::Rect top_right(
110      bounds().width() - right_width, 0, right_width, top_height);
111  gfx::Rect bottom_left(
112      0, bounds().height() - bottom_height, left_width, bottom_height);
113  gfx::Rect bottom_right(
114      top_right.x(), bottom_left.y(), right_width, bottom_height);
115  gfx::Rect top(top_left.right(), 0, middle_width, top_height);
116  gfx::Rect left(0, top_left.bottom(), left_width, middle_height);
117  gfx::Rect right(top_right.x(),
118                  top_right.bottom(),
119                  right_width,
120                  left.height());
121  gfx::Rect bottom(top.x(), bottom_left.y(), top.width(), bottom_height);
122
123  float img_width = image_bounds_.width();
124  float img_height = image_bounds_.height();
125
126  // Patch positions in bitmap UV space (from zero to one)
127  gfx::RectF uv_top_left = NormalizedRect(0,
128                                          0,
129                                          left_width,
130                                          top_height,
131                                          img_width,
132                                          img_height);
133  gfx::RectF uv_top_right = NormalizedRect(img_width - right_width,
134                                           0,
135                                           right_width,
136                                           top_height,
137                                           img_width,
138                                           img_height);
139  gfx::RectF uv_bottom_left = NormalizedRect(0,
140                                             img_height - bottom_height,
141                                             left_width,
142                                             bottom_height,
143                                             img_width,
144                                             img_height);
145  gfx::RectF uv_bottom_right = NormalizedRect(img_width - right_width,
146                                              img_height - bottom_height,
147                                              right_width,
148                                              bottom_height,
149                                              img_width,
150                                              img_height);
151  gfx::RectF uv_top(uv_top_left.right(),
152                   0,
153                   (img_width - left_width - right_width) / img_width,
154                   (top_height) / img_height);
155  gfx::RectF uv_left(0,
156                    uv_top_left.bottom(),
157                    left_width / img_width,
158                    (img_height - top_height - bottom_height) / img_height);
159  gfx::RectF uv_right(uv_top_right.x(),
160                     uv_top_right.bottom(),
161                     right_width / img_width,
162                     uv_left.height());
163  gfx::RectF uv_bottom(uv_top.x(),
164                      uv_bottom_left.y(),
165                      uv_top.width(),
166                      bottom_height / img_height);
167
168  // Nothing is opaque here.
169  // TODO(danakj): Should we look at the SkBitmaps to determine opaqueness?
170  gfx::Rect opaque_rect;
171  const float vertex_opacity[] = {1.0f, 1.0f, 1.0f, 1.0f};
172  scoped_ptr<TextureDrawQuad> quad;
173
174  quad = TextureDrawQuad::Create();
175  quad->SetNew(shared_quad_state,
176               top_left,
177               opaque_rect,
178               resource_id_,
179               premultiplied_alpha,
180               uv_top_left.origin(),
181               uv_top_left.bottom_right(),
182               vertex_opacity, flipped);
183  quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
184
185  quad = TextureDrawQuad::Create();
186  quad->SetNew(shared_quad_state,
187               top_right,
188               opaque_rect,
189               resource_id_,
190               premultiplied_alpha,
191               uv_top_right.origin(),
192               uv_top_right.bottom_right(),
193               vertex_opacity, flipped);
194  quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
195
196  quad = TextureDrawQuad::Create();
197  quad->SetNew(shared_quad_state,
198               bottom_left,
199               opaque_rect,
200               resource_id_,
201               premultiplied_alpha,
202               uv_bottom_left.origin(),
203               uv_bottom_left.bottom_right(),
204               vertex_opacity,
205               flipped);
206  quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
207
208  quad = TextureDrawQuad::Create();
209  quad->SetNew(shared_quad_state,
210               bottom_right,
211               opaque_rect,
212               resource_id_,
213               premultiplied_alpha,
214               uv_bottom_right.origin(),
215               uv_bottom_right.bottom_right(),
216               vertex_opacity,
217               flipped);
218  quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
219
220  quad = TextureDrawQuad::Create();
221  quad->SetNew(shared_quad_state,
222               top,
223               opaque_rect,
224               resource_id_,
225               premultiplied_alpha,
226               uv_top.origin(),
227               uv_top.bottom_right(),
228               vertex_opacity,
229               flipped);
230  quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
231
232  quad = TextureDrawQuad::Create();
233  quad->SetNew(shared_quad_state,
234               left,
235               opaque_rect,
236               resource_id_,
237               premultiplied_alpha,
238               uv_left.origin(),
239               uv_left.bottom_right(),
240               vertex_opacity,
241               flipped);
242  quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
243
244  quad = TextureDrawQuad::Create();
245  quad->SetNew(shared_quad_state,
246               right,
247               opaque_rect,
248               resource_id_,
249               premultiplied_alpha,
250               uv_right.origin(),
251               uv_right.bottom_right(),
252               vertex_opacity,
253               flipped);
254  quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
255
256  quad = TextureDrawQuad::Create();
257  quad->SetNew(shared_quad_state,
258               bottom,
259               opaque_rect,
260               resource_id_,
261               premultiplied_alpha,
262               uv_bottom.origin(),
263               uv_bottom.bottom_right(),
264               vertex_opacity,
265               flipped);
266  quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
267}
268
269void NinePatchLayerImpl::DidLoseOutputSurface() {
270  resource_id_ = 0;
271}
272
273const char* NinePatchLayerImpl::LayerTypeAsString() const {
274  return "cc::NinePatchLayerImpl";
275}
276
277base::DictionaryValue* NinePatchLayerImpl::LayerTreeAsJson() const {
278  base::DictionaryValue* result = LayerImpl::LayerTreeAsJson();
279
280  base::ListValue* list = new base::ListValue;
281  list->AppendInteger(image_aperture_.origin().x());
282  list->AppendInteger(image_aperture_.origin().y());
283  list->AppendInteger(image_aperture_.size().width());
284  list->AppendInteger(image_aperture_.size().height());
285  result->Set("ImageAperture", list);
286
287  list = new base::ListValue;
288  list->AppendInteger(image_bounds_.width());
289  list->AppendInteger(image_bounds_.height());
290  result->Set("ImageBounds", list);
291
292  return result;
293}
294
295}  // namespace cc
296