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      1 // Copyright 2011 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/texture_layer_impl.h"
      6 
      7 #include <vector>
      8 
      9 #include "base/strings/stringprintf.h"
     10 #include "cc/layers/quad_sink.h"
     11 #include "cc/output/renderer.h"
     12 #include "cc/quads/texture_draw_quad.h"
     13 #include "cc/resources/platform_color.h"
     14 #include "cc/resources/scoped_resource.h"
     15 #include "cc/resources/single_release_callback.h"
     16 #include "cc/trees/layer_tree_impl.h"
     17 
     18 namespace cc {
     19 
     20 TextureLayerImpl::TextureLayerImpl(LayerTreeImpl* tree_impl, int id)
     21     : LayerImpl(tree_impl, id),
     22       external_texture_resource_(0),
     23       premultiplied_alpha_(true),
     24       blend_background_color_(false),
     25       flipped_(true),
     26       uv_top_left_(0.f, 0.f),
     27       uv_bottom_right_(1.f, 1.f),
     28       own_mailbox_(false),
     29       valid_texture_copy_(false) {
     30   vertex_opacity_[0] = 1.0f;
     31   vertex_opacity_[1] = 1.0f;
     32   vertex_opacity_[2] = 1.0f;
     33   vertex_opacity_[3] = 1.0f;
     34 }
     35 
     36 TextureLayerImpl::~TextureLayerImpl() { FreeTextureMailbox(); }
     37 
     38 void TextureLayerImpl::SetTextureMailbox(
     39     const TextureMailbox& mailbox,
     40     scoped_ptr<SingleReleaseCallback> release_callback) {
     41   DCHECK_EQ(mailbox.IsValid(), !!release_callback);
     42   FreeTextureMailbox();
     43   texture_mailbox_ = mailbox;
     44   release_callback_ = release_callback.Pass();
     45   own_mailbox_ = true;
     46   valid_texture_copy_ = false;
     47   SetNeedsPushProperties();
     48 }
     49 
     50 scoped_ptr<LayerImpl> TextureLayerImpl::CreateLayerImpl(
     51     LayerTreeImpl* tree_impl) {
     52   return TextureLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
     53 }
     54 
     55 void TextureLayerImpl::PushPropertiesTo(LayerImpl* layer) {
     56   LayerImpl::PushPropertiesTo(layer);
     57 
     58   TextureLayerImpl* texture_layer = static_cast<TextureLayerImpl*>(layer);
     59   texture_layer->SetFlipped(flipped_);
     60   texture_layer->SetUVTopLeft(uv_top_left_);
     61   texture_layer->SetUVBottomRight(uv_bottom_right_);
     62   texture_layer->SetVertexOpacity(vertex_opacity_);
     63   texture_layer->SetPremultipliedAlpha(premultiplied_alpha_);
     64   texture_layer->SetBlendBackgroundColor(blend_background_color_);
     65   if (own_mailbox_) {
     66     texture_layer->SetTextureMailbox(texture_mailbox_,
     67                                      release_callback_.Pass());
     68     own_mailbox_ = false;
     69   }
     70 }
     71 
     72 bool TextureLayerImpl::WillDraw(DrawMode draw_mode,
     73                                 ResourceProvider* resource_provider) {
     74   if (draw_mode == DRAW_MODE_RESOURCELESS_SOFTWARE)
     75     return false;
     76 
     77   if (own_mailbox_) {
     78     DCHECK(!external_texture_resource_);
     79     if ((draw_mode == DRAW_MODE_HARDWARE && texture_mailbox_.IsTexture()) ||
     80         (draw_mode == DRAW_MODE_SOFTWARE &&
     81          texture_mailbox_.IsSharedMemory())) {
     82       external_texture_resource_ =
     83           resource_provider->CreateResourceFromTextureMailbox(
     84               texture_mailbox_, release_callback_.Pass());
     85       DCHECK(external_texture_resource_);
     86       texture_copy_.reset();
     87       valid_texture_copy_ = false;
     88     }
     89     if (external_texture_resource_)
     90       own_mailbox_ = false;
     91   }
     92 
     93   if (!valid_texture_copy_ && draw_mode == DRAW_MODE_HARDWARE &&
     94       texture_mailbox_.IsSharedMemory()) {
     95     DCHECK(!external_texture_resource_);
     96     // Have to upload a copy to a texture for it to be used in a
     97     // hardware draw.
     98     if (!texture_copy_)
     99       texture_copy_ = ScopedResource::Create(resource_provider);
    100     if (texture_copy_->size() != texture_mailbox_.shared_memory_size() ||
    101         resource_provider->InUseByConsumer(texture_copy_->id()))
    102       texture_copy_->Free();
    103 
    104     if (!texture_copy_->id()) {
    105       texture_copy_->Allocate(texture_mailbox_.shared_memory_size(),
    106                               ResourceProvider::TextureUsageAny,
    107                               resource_provider->best_texture_format());
    108     }
    109 
    110     if (texture_copy_->id()) {
    111       std::vector<uint8> swizzled;
    112       uint8* pixels =
    113           static_cast<uint8*>(texture_mailbox_.shared_memory()->memory());
    114 
    115       if (!PlatformColor::SameComponentOrder(texture_copy_->format())) {
    116         // Swizzle colors. This is slow, but should be really uncommon.
    117         size_t bytes = texture_mailbox_.SharedMemorySizeInBytes();
    118         swizzled.resize(bytes);
    119         for (size_t i = 0; i < bytes; i += 4) {
    120           swizzled[i] = pixels[i + 2];
    121           swizzled[i + 1] = pixels[i + 1];
    122           swizzled[i + 2] = pixels[i];
    123           swizzled[i + 3] = pixels[i + 3];
    124         }
    125         pixels = &swizzled[0];
    126       }
    127 
    128       resource_provider->SetPixels(
    129           texture_copy_->id(),
    130           pixels,
    131           gfx::Rect(texture_mailbox_.shared_memory_size()),
    132           gfx::Rect(texture_mailbox_.shared_memory_size()),
    133           gfx::Vector2d());
    134 
    135       valid_texture_copy_ = true;
    136     }
    137   }
    138   return (external_texture_resource_ || valid_texture_copy_) &&
    139          LayerImpl::WillDraw(draw_mode, resource_provider);
    140 }
    141 
    142 void TextureLayerImpl::AppendQuads(QuadSink* quad_sink,
    143                                    AppendQuadsData* append_quads_data) {
    144   DCHECK(external_texture_resource_ || valid_texture_copy_);
    145 
    146   SharedQuadState* shared_quad_state = quad_sink->CreateSharedQuadState();
    147   PopulateSharedQuadState(shared_quad_state);
    148 
    149   AppendDebugBorderQuad(
    150       quad_sink, content_bounds(), shared_quad_state, append_quads_data);
    151 
    152   SkColor bg_color = blend_background_color_ ?
    153       background_color() : SK_ColorTRANSPARENT;
    154   bool opaque = contents_opaque() || (SkColorGetA(bg_color) == 0xFF);
    155 
    156   gfx::Rect quad_rect(content_bounds());
    157   gfx::Rect opaque_rect = opaque ? quad_rect : gfx::Rect();
    158   gfx::Rect visible_quad_rect = quad_sink->UnoccludedContentRect(
    159       quad_rect, draw_properties().target_space_transform);
    160   if (visible_quad_rect.IsEmpty())
    161     return;
    162 
    163   scoped_ptr<TextureDrawQuad> quad = TextureDrawQuad::Create();
    164   ResourceProvider::ResourceId id =
    165       valid_texture_copy_ ? texture_copy_->id() : external_texture_resource_;
    166   quad->SetNew(shared_quad_state,
    167                quad_rect,
    168                opaque_rect,
    169                visible_quad_rect,
    170                id,
    171                premultiplied_alpha_,
    172                uv_top_left_,
    173                uv_bottom_right_,
    174                bg_color,
    175                vertex_opacity_,
    176                flipped_);
    177   quad_sink->Append(quad.PassAs<DrawQuad>());
    178 }
    179 
    180 Region TextureLayerImpl::VisibleContentOpaqueRegion() const {
    181   if (contents_opaque())
    182     return visible_content_rect();
    183 
    184   if (blend_background_color_ && (SkColorGetA(background_color()) == 0xFF))
    185     return visible_content_rect();
    186 
    187   return Region();
    188 }
    189 
    190 void TextureLayerImpl::ReleaseResources() {
    191   FreeTextureMailbox();
    192   texture_copy_.reset();
    193   external_texture_resource_ = 0;
    194   valid_texture_copy_ = false;
    195 }
    196 
    197 void TextureLayerImpl::SetPremultipliedAlpha(bool premultiplied_alpha) {
    198   premultiplied_alpha_ = premultiplied_alpha;
    199   SetNeedsPushProperties();
    200 }
    201 
    202 void TextureLayerImpl::SetBlendBackgroundColor(bool blend) {
    203   blend_background_color_ = blend;
    204   SetNeedsPushProperties();
    205 }
    206 
    207 void TextureLayerImpl::SetFlipped(bool flipped) {
    208   flipped_ = flipped;
    209   SetNeedsPushProperties();
    210 }
    211 
    212 void TextureLayerImpl::SetUVTopLeft(const gfx::PointF top_left) {
    213   uv_top_left_ = top_left;
    214   SetNeedsPushProperties();
    215 }
    216 
    217 void TextureLayerImpl::SetUVBottomRight(const gfx::PointF bottom_right) {
    218   uv_bottom_right_ = bottom_right;
    219   SetNeedsPushProperties();
    220 }
    221 
    222 // 1--2
    223 // |  |
    224 // 0--3
    225 void TextureLayerImpl::SetVertexOpacity(const float vertex_opacity[4]) {
    226   vertex_opacity_[0] = vertex_opacity[0];
    227   vertex_opacity_[1] = vertex_opacity[1];
    228   vertex_opacity_[2] = vertex_opacity[2];
    229   vertex_opacity_[3] = vertex_opacity[3];
    230   SetNeedsPushProperties();
    231 }
    232 
    233 const char* TextureLayerImpl::LayerTypeAsString() const {
    234   return "cc::TextureLayerImpl";
    235 }
    236 
    237 void TextureLayerImpl::FreeTextureMailbox() {
    238   if (own_mailbox_) {
    239     DCHECK(!external_texture_resource_);
    240     if (release_callback_)
    241       release_callback_->Run(texture_mailbox_.sync_point(), false);
    242     texture_mailbox_ = TextureMailbox();
    243     release_callback_.reset();
    244   } else if (external_texture_resource_) {
    245     DCHECK(!own_mailbox_);
    246     ResourceProvider* resource_provider =
    247         layer_tree_impl()->resource_provider();
    248     resource_provider->DeleteResource(external_texture_resource_);
    249     external_texture_resource_ = 0;
    250   }
    251 }
    252 
    253 }  // namespace cc
    254