cc/resources/resource_provider.h

   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 #ifndef CC_RESOURCES_RESOURCE_PROVIDER_H_
   6 #define CC_RESOURCES_RESOURCE_PROVIDER_H_
   7
   8 #include <deque>
   9 #include <set>
  10 #include <string>
  11 #include <utility>
  12 #include <vector>
  13
  14 #include "base/basictypes.h"
  15 #include "base/callback.h"
  16 #include "base/containers/hash_tables.h"
  17 #include "base/memory/linked_ptr.h"
  18 #include "base/memory/scoped_ptr.h"
  19 #include "base/threading/thread_checker.h"
  20 #include "cc/base/cc_export.h"
  21 #include "cc/output/context_provider.h"
  22 #include "cc/output/output_surface.h"
  23 #include "cc/resources/release_callback_impl.h"
  24 #include "cc/resources/resource_format.h"
  25 #include "cc/resources/return_callback.h"
  26 #include "cc/resources/shared_bitmap.h"
  27 #include "cc/resources/single_release_callback_impl.h"
  28 #include "cc/resources/texture_mailbox.h"
  29 #include "cc/resources/transferable_resource.h"
  30 #include "third_party/khronos/GLES2/gl2.h"
  31 #include "third_party/khronos/GLES2/gl2ext.h"
  32 #include "third_party/skia/include/core/SkBitmap.h"
  33 #include "third_party/skia/include/core/SkCanvas.h"
  34 #include "ui/gfx/geometry/size.h"
  35
  36 class GrContext;
  37
  38 namespace gpu {
  39 class GpuMemoryBufferManager;
  40 namespace gles {
  41 class GLES2Interface;
  42 }
  43 }
  44
  45 namespace gfx {
  46 class GpuMemoryBuffer;
  47 class Rect;
  48 class Vector2d;
  49 }
  50
  51 namespace cc {
  52 class BlockingTaskRunner;
  53 class IdAllocator;
  54 class SharedBitmap;
  55 class SharedBitmapManager;
  56 class TextureUploader;
  57
  58 // This class is not thread-safe and can only be called from the thread it was
  59 // created on (in practice, the impl thread).
  60 class CC_EXPORT ResourceProvider {
  61  private:
  62   struct Resource;
  63
  64  public:
  65   typedef unsigned ResourceId;
  66   typedef std::vector<ResourceId> ResourceIdArray;
  67   typedef std::set<ResourceId> ResourceIdSet;
  68   typedef base::hash_map<ResourceId, ResourceId> ResourceIdMap;
  69   enum TextureHint {
  70     TextureHintDefault = 0x0,
  71     TextureHintImmutable = 0x1,
  72     TextureHintFramebuffer = 0x2,
  73     TextureHintImmutableFramebuffer =
  74         TextureHintImmutable | TextureHintFramebuffer
  75   };
  76   enum ResourceType {
  77     InvalidType = 0,
  78     GLTexture = 1,
  79     Bitmap,
  80   };
  81
  82   static scoped_ptr<ResourceProvider> Create(
  83       OutputSurface* output_surface,
  84       SharedBitmapManager* shared_bitmap_manager,
  85       gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
  86       BlockingTaskRunner* blocking_main_thread_task_runner,
  87       int highp_threshold_min,
  88       bool use_rgba_4444_texture_format,
  89       size_t id_allocation_chunk_size);
  90   virtual ~ResourceProvider();
  91
  92   void InitializeSoftware();
  93   void InitializeGL();
  94
  95   void DidLoseOutputSurface() { lost_output_surface_ = true; }
  96
  97   int max_texture_size() const { return max_texture_size_; }
  98   ResourceFormat memory_efficient_texture_format() const {
  99     return use_rgba_4444_texture_format_ ? RGBA_4444 : best_texture_format_;
 100   }
 101   ResourceFormat best_texture_format() const { return best_texture_format_; }
 102   ResourceFormat yuv_resource_format() const { return yuv_resource_format_; }
 103   bool use_sync_query() const { return use_sync_query_; }
 104   size_t num_resources() const { return resources_.size(); }
 105
 106   // Checks whether a resource is in use by a consumer.
 107   bool InUseByConsumer(ResourceId id);
 108
 109   bool IsLost(ResourceId id);
 110   bool AllowOverlay(ResourceId id);
 111
 112   // Producer interface.
 113
 114   ResourceType default_resource_type() const { return default_resource_type_; }
 115   ResourceType GetResourceType(ResourceId id);
 116
 117   // Creates a resource of the default resource type.
 118   ResourceId CreateResource(const gfx::Size& size,
 119                             GLint wrap_mode,
 120                             TextureHint hint,
 121                             ResourceFormat format);
 122
 123   // Creates a resource which is tagged as being managed for GPU memory
 124   // accounting purposes.
 125   ResourceId CreateManagedResource(const gfx::Size& size,
 126                                    GLenum target,
 127                                    GLint wrap_mode,
 128                                    TextureHint hint,
 129                                    ResourceFormat format);
 130
 131   // You can also explicitly create a specific resource type.
 132   ResourceId CreateGLTexture(const gfx::Size& size,
 133                              GLenum target,
 134                              GLenum texture_pool,
 135                              GLint wrap_mode,
 136                              TextureHint hint,
 137                              ResourceFormat format);
 138
 139   ResourceId CreateBitmap(const gfx::Size& size, GLint wrap_mode);
 140   // Wraps an IOSurface into a GL resource.
 141   ResourceId CreateResourceFromIOSurface(const gfx::Size& size,
 142                                          unsigned io_surface_id);
 143
 144   // Wraps an external texture mailbox into a GL resource.
 145   ResourceId CreateResourceFromTextureMailbox(
 146       const TextureMailbox& mailbox,
 147       scoped_ptr<SingleReleaseCallbackImpl> release_callback_impl);
 148
 149   void DeleteResource(ResourceId id);
 150
 151   // Update pixels from image, copying source_rect (in image) to dest_offset (in
 152   // the resource).
 153   void SetPixels(ResourceId id,
 154                  const uint8_t* image,
 155                  const gfx::Rect& image_rect,
 156                  const gfx::Rect& source_rect,
 157                  const gfx::Vector2d& dest_offset);
 158
 159   // Check upload status.
 160   size_t NumBlockingUploads();
 161   void MarkPendingUploadsAsNonBlocking();
 162   size_t EstimatedUploadsPerTick();
 163   void FlushUploads();
 164   void ReleaseCachedData();
 165   base::TimeTicks EstimatedUploadCompletionTime(size_t uploads_per_tick);
 166
 167   // Only flush the command buffer if supported.
 168   // Returns true if the shallow flush occurred, false otherwise.
 169   bool ShallowFlushIfSupported();
 170
 171   // Creates accounting for a child. Returns a child ID.
 172   int CreateChild(const ReturnCallback& return_callback);
 173
 174   // Destroys accounting for the child, deleting all accounted resources.
 175   void DestroyChild(int child);
 176
 177   // Gets the child->parent resource ID map.
 178   const ResourceIdMap& GetChildToParentMap(int child) const;
 179
 180   // Prepares resources to be transfered to the parent, moving them to
 181   // mailboxes and serializing meta-data into TransferableResources.
 182   // Resources are not removed from the ResourceProvider, but are marked as
 183   // "in use".
 184   void PrepareSendToParent(const ResourceIdArray& resources,
 185                            TransferableResourceArray* transferable_resources);
 186
 187   // Receives resources from a child, moving them from mailboxes. Resource IDs
 188   // passed are in the child namespace, and will be translated to the parent
 189   // namespace, added to the child->parent map.
 190   // This adds the resources to the working set in the ResourceProvider without
 191   // declaring which resources are in use. Use DeclareUsedResourcesFromChild
 192   // after calling this method to do that. All calls to ReceiveFromChild should
 193   // be followed by a DeclareUsedResourcesFromChild.
 194   // NOTE: if the sync_point is set on any TransferableResource, this will
 195   // wait on it.
 196   void ReceiveFromChild(
 197       int child, const TransferableResourceArray& transferable_resources);
 198
 199   // Once a set of resources have been received, they may or may not be used.
 200   // This declares what set of resources are currently in use from the child,
 201   // releasing any other resources back to the child.
 202   void DeclareUsedResourcesFromChild(
 203       int child,
 204       const ResourceIdArray& resources_from_child);
 205
 206   // Receives resources from the parent, moving them from mailboxes. Resource
 207   // IDs passed are in the child namespace.
 208   // NOTE: if the sync_point is set on any TransferableResource, this will
 209   // wait on it.
 210   void ReceiveReturnsFromParent(
 211       const ReturnedResourceArray& transferable_resources);
 212
 213   // The following lock classes are part of the ResourceProvider API and are
 214   // needed to read and write the resource contents. The user must ensure
 215   // that they only use GL locks on GL resources, etc, and this is enforced
 216   // by assertions.
 217   class CC_EXPORT ScopedReadLockGL {
 218    public:
 219     ScopedReadLockGL(ResourceProvider* resource_provider,
 220                      ResourceProvider::ResourceId resource_id);
 221     virtual ~ScopedReadLockGL();
 222
 223     unsigned texture_id() const { return texture_id_; }
 224
 225    protected:
 226     ResourceProvider* resource_provider_;
 227     ResourceProvider::ResourceId resource_id_;
 228
 229    private:
 230     unsigned texture_id_;
 231
 232     DISALLOW_COPY_AND_ASSIGN(ScopedReadLockGL);
 233   };
 234
 235   class CC_EXPORT ScopedSamplerGL : public ScopedReadLockGL {
 236    public:
 237     ScopedSamplerGL(ResourceProvider* resource_provider,
 238                     ResourceProvider::ResourceId resource_id,
 239                     GLenum filter);
 240     ScopedSamplerGL(ResourceProvider* resource_provider,
 241                     ResourceProvider::ResourceId resource_id,
 242                     GLenum unit,
 243                     GLenum filter);
 244     ~ScopedSamplerGL() override;
 245
 246     GLenum target() const { return target_; }
 247
 248    private:
 249     GLenum unit_;
 250     GLenum target_;
 251
 252     DISALLOW_COPY_AND_ASSIGN(ScopedSamplerGL);
 253   };
 254
 255   class CC_EXPORT ScopedWriteLockGL {
 256    public:
 257     ScopedWriteLockGL(ResourceProvider* resource_provider,
 258                       ResourceProvider::ResourceId resource_id);
 259     ~ScopedWriteLockGL();
 260
 261     unsigned texture_id() const { return texture_id_; }
 262
 263    private:
 264     ResourceProvider* resource_provider_;
 265     ResourceProvider::Resource* resource_;
 266     unsigned texture_id_;
 267
 268     DISALLOW_COPY_AND_ASSIGN(ScopedWriteLockGL);
 269   };
 270
 271   class CC_EXPORT ScopedReadLockSoftware {
 272    public:
 273     ScopedReadLockSoftware(ResourceProvider* resource_provider,
 274                            ResourceProvider::ResourceId resource_id);
 275     ~ScopedReadLockSoftware();
 276
 277     const SkBitmap* sk_bitmap() const {
 278       DCHECK(valid());
 279       return &sk_bitmap_;
 280     }
 281     GLint wrap_mode() const { return wrap_mode_; }
 282
 283     bool valid() const { return !!sk_bitmap_.getPixels(); }
 284
 285    private:
 286     ResourceProvider* resource_provider_;
 287     ResourceProvider::ResourceId resource_id_;
 288     SkBitmap sk_bitmap_;
 289     GLint wrap_mode_;
 290
 291     DISALLOW_COPY_AND_ASSIGN(ScopedReadLockSoftware);
 292   };
 293
 294   class CC_EXPORT ScopedWriteLockSoftware {
 295    public:
 296     ScopedWriteLockSoftware(ResourceProvider* resource_provider,
 297                             ResourceProvider::ResourceId resource_id);
 298     ~ScopedWriteLockSoftware();
 299
 300     SkBitmap& sk_bitmap() { return sk_bitmap_; }
 301     bool valid() const { return !!sk_bitmap_.getPixels(); }
 302
 303    private:
 304     ResourceProvider* resource_provider_;
 305     ResourceProvider::Resource* resource_;
 306     SkBitmap sk_bitmap_;
 307     base::ThreadChecker thread_checker_;
 308
 309     DISALLOW_COPY_AND_ASSIGN(ScopedWriteLockSoftware);
 310   };
 311
 312   class CC_EXPORT ScopedWriteLockGpuMemoryBuffer {
 313    public:
 314     ScopedWriteLockGpuMemoryBuffer(ResourceProvider* resource_provider,
 315                                    ResourceProvider::ResourceId resource_id);
 316     ~ScopedWriteLockGpuMemoryBuffer();
 317
 318     gfx::GpuMemoryBuffer* GetGpuMemoryBuffer();
 319
 320    private:
 321     ResourceProvider* resource_provider_;
 322     ResourceProvider::Resource* resource_;
 323     gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager_;
 324     gfx::GpuMemoryBuffer* gpu_memory_buffer_;
 325     gfx::Size size_;
 326     ResourceFormat format_;
 327     base::ThreadChecker thread_checker_;
 328
 329     DISALLOW_COPY_AND_ASSIGN(ScopedWriteLockGpuMemoryBuffer);
 330   };
 331
 332   class CC_EXPORT ScopedWriteLockGr {
 333    public:
 334     ScopedWriteLockGr(ResourceProvider* resource_provider,
 335                       ResourceProvider::ResourceId resource_id);
 336     ~ScopedWriteLockGr();
 337
 338     SkSurface* GetSkSurface(bool use_distance_field_text,
 339                             bool can_use_lcd_text);
 340
 341    private:
 342     bool SurfaceHasMatchingProperties(bool use_distance_field_text,
 343                                       bool can_use_lcd_text) const;
 344
 345     ResourceProvider* resource_provider_;
 346     ResourceProvider::Resource* resource_;
 347     base::ThreadChecker thread_checker_;
 348
 349     DISALLOW_COPY_AND_ASSIGN(ScopedWriteLockGr);
 350   };
 351
 352   class Fence : public base::RefCounted<Fence> {
 353    public:
 354     Fence() {}
 355
 356     virtual void Set() = 0;
 357     virtual bool HasPassed() = 0;
 358     virtual void Wait() = 0;
 359
 360    protected:
 361     friend class base::RefCounted<Fence>;
 362     virtual ~Fence() {}
 363
 364    private:
 365     DISALLOW_COPY_AND_ASSIGN(Fence);
 366   };
 367
 368   class SynchronousFence : public ResourceProvider::Fence {
 369    public:
 370     explicit SynchronousFence(gpu::gles2::GLES2Interface* gl);
 371
 372     // Overridden from Fence:
 373     void Set() override;
 374     bool HasPassed() override;
 375     void Wait() override;
 376
 377     // Returns true if fence has been set but not yet synchornized.
 378     bool has_synchronized() const { return has_synchronized_; }
 379
 380    private:
 381     ~SynchronousFence() override;
 382
 383     void Synchronize();
 384
 385     gpu::gles2::GLES2Interface* gl_;
 386     bool has_synchronized_;
 387
 388     DISALLOW_COPY_AND_ASSIGN(SynchronousFence);
 389   };
 390
 391   // Acquire pixel buffer for resource. The pixel buffer can be used to
 392   // set resource pixels without performing unnecessary copying.
 393   void AcquirePixelBuffer(ResourceId resource);
 394   void ReleasePixelBuffer(ResourceId resource);
 395   // Map/unmap the acquired pixel buffer.
 396   uint8_t* MapPixelBuffer(ResourceId id, int* stride);
 397   void UnmapPixelBuffer(ResourceId id);
 398   // Asynchronously update pixels from acquired pixel buffer.
 399   void BeginSetPixels(ResourceId id);
 400   void ForceSetPixelsToComplete(ResourceId id);
 401   bool DidSetPixelsComplete(ResourceId id);
 402
 403   // For tests only! This prevents detecting uninitialized reads.
 404   // Use SetPixels or LockForWrite to allocate implicitly.
 405   void AllocateForTesting(ResourceId id);
 406
 407   // For tests only!
 408   void CreateForTesting(ResourceId id);
 409
 410   GLenum TargetForTesting(ResourceId id);
 411
 412   // Sets the current read fence. If a resource is locked for read
 413   // and has read fences enabled, the resource will not allow writes
 414   // until this fence has passed.
 415   void SetReadLockFence(Fence* fence) { current_read_lock_fence_ = fence; }
 416
 417   // Indicates if we can currently lock this resource for write.
 418   bool CanLockForWrite(ResourceId id);
 419
 420   // Copy pixels from source to destination.
 421   void CopyResource(ResourceId source_id, ResourceId dest_id);
 422
 423   void WaitSyncPointIfNeeded(ResourceId id);
 424
 425   void WaitReadLockIfNeeded(ResourceId id);
 426
 427   static GLint GetActiveTextureUnit(gpu::gles2::GLES2Interface* gl);
 428
 429  private:
 430   struct Resource {
 431     enum Origin { Internal, External, Delegated };
 432
 433     Resource();
 434     ~Resource();
 435     Resource(unsigned texture_id,
 436              const gfx::Size& size,
 437              Origin origin,
 438              GLenum target,
 439              GLenum filter,
 440              GLenum texture_pool,
 441              GLint wrap_mode,
 442              TextureHint hint,
 443              ResourceFormat format);
 444     Resource(uint8_t* pixels,
 445              SharedBitmap* bitmap,
 446              const gfx::Size& size,
 447              Origin origin,
 448              GLenum filter,
 449              GLint wrap_mode);
 450     Resource(const SharedBitmapId& bitmap_id,
 451              const gfx::Size& size,
 452              Origin origin,
 453              GLenum filter,
 454              GLint wrap_mode);
 455
 456     int child_id;
 457     unsigned gl_id;
 458     // Pixel buffer used for set pixels without unnecessary copying.
 459     unsigned gl_pixel_buffer_id;
 460     // Query used to determine when asynchronous set pixels complete.
 461     unsigned gl_upload_query_id;
 462     // Query used to determine when read lock fence has passed.
 463     unsigned gl_read_lock_query_id;
 464     TextureMailbox mailbox;
 465     ReleaseCallbackImpl release_callback_impl;
 466     uint8_t* pixels;
 467     int lock_for_read_count;
 468     int imported_count;
 469     int exported_count;
 470     bool dirty_image : 1;
 471     bool locked_for_write : 1;
 472     bool lost : 1;
 473     bool marked_for_deletion : 1;
 474     bool pending_set_pixels : 1;
 475     bool set_pixels_completion_forced : 1;
 476     bool allocated : 1;
 477     bool read_lock_fences_enabled : 1;
 478     bool has_shared_bitmap_id : 1;
 479     bool allow_overlay : 1;
 480     scoped_refptr<Fence> read_lock_fence;
 481     gfx::Size size;
 482     Origin origin;
 483     GLenum target;
 484     // TODO(skyostil): Use a separate sampler object for filter state.
 485     GLenum original_filter;
 486     GLenum filter;
 487     unsigned image_id;
 488     unsigned bound_image_id;
 489     GLenum texture_pool;
 490     GLint wrap_mode;
 491     TextureHint hint;
 492     ResourceType type;
 493     ResourceFormat format;
 494     SharedBitmapId shared_bitmap_id;
 495     SharedBitmap* shared_bitmap;
 496     gfx::GpuMemoryBuffer* gpu_memory_buffer;
 497     skia::RefPtr<SkSurface> sk_surface;
 498   };
 499   typedef base::hash_map<ResourceId, Resource> ResourceMap;
 500
 501   static bool CompareResourceMapIteratorsByChildId(
 502       const std::pair<ReturnedResource, ResourceMap::iterator>& a,
 503       const std::pair<ReturnedResource, ResourceMap::iterator>& b);
 504
 505   struct Child {
 506     Child();
 507     ~Child();
 508
 509     ResourceIdMap child_to_parent_map;
 510     ResourceIdMap parent_to_child_map;
 511     ReturnCallback return_callback;
 512     ResourceIdSet in_use_resources;
 513     bool marked_for_deletion;
 514   };
 515   typedef base::hash_map<int, Child> ChildMap;
 516
 517   bool ReadLockFenceHasPassed(const Resource* resource) {
 518     return !resource->read_lock_fence.get() ||
 519            resource->read_lock_fence->HasPassed();
 520   }
 521
 522   ResourceProvider(OutputSurface* output_surface,
 523                    SharedBitmapManager* shared_bitmap_manager,
 524                    gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
 525                    BlockingTaskRunner* blocking_main_thread_task_runner,
 526                    int highp_threshold_min,
 527                    bool use_rgba_4444_texture_format,
 528                    size_t id_allocation_chunk_size);
 529
 530   void CleanUpGLIfNeeded();
 531
 532   Resource* GetResource(ResourceId id);
 533   const Resource* LockForRead(ResourceId id);
 534   void UnlockForRead(ResourceId id);
 535   Resource* LockForWrite(ResourceId id);
 536   void UnlockForWrite(Resource* resource);
 537
 538   static void PopulateSkBitmapWithResource(SkBitmap* sk_bitmap,
 539                                            const Resource* resource);
 540
 541   void TransferResource(gpu::gles2::GLES2Interface* gl,
 542                         ResourceId id,
 543                         TransferableResource* resource);
 544   enum DeleteStyle {
 545     Normal,
 546     ForShutdown,
 547   };
 548   void DeleteResourceInternal(ResourceMap::iterator it, DeleteStyle style);
 549   void DeleteAndReturnUnusedResourcesToChild(ChildMap::iterator child_it,
 550                                              DeleteStyle style,
 551                                              const ResourceIdArray& unused);
 552   void DestroyChildInternal(ChildMap::iterator it, DeleteStyle style);
 553   void LazyCreate(Resource* resource);
 554   void LazyAllocate(Resource* resource);
 555
 556   void BindImageForSampling(Resource* resource);
 557   // Binds the given GL resource to a texture target for sampling using the
 558   // specified filter for both minification and magnification. Returns the
 559   // texture target used. The resource must be locked for reading.
 560   GLenum BindForSampling(ResourceId resource_id, GLenum unit, GLenum filter);
 561
 562   // Returns NULL if the output_surface_ does not have a ContextProvider.
 563   gpu::gles2::GLES2Interface* ContextGL() const;
 564   class GrContext* GrContext() const;
 565
 566   OutputSurface* output_surface_;
 567   SharedBitmapManager* shared_bitmap_manager_;
 568   gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager_;
 569   BlockingTaskRunner* blocking_main_thread_task_runner_;
 570   bool lost_output_surface_;
 571   int highp_threshold_min_;
 572   ResourceId next_id_;
 573   ResourceMap resources_;
 574   int next_child_;
 575   ChildMap children_;
 576
 577   ResourceType default_resource_type_;
 578   bool use_texture_storage_ext_;
 579   bool use_texture_format_bgra_;
 580   bool use_texture_usage_hint_;
 581   bool use_compressed_texture_etc1_;
 582   ResourceFormat yuv_resource_format_;
 583   scoped_ptr<TextureUploader> texture_uploader_;
 584   int max_texture_size_;
 585   ResourceFormat best_texture_format_;
 586
 587   base::ThreadChecker thread_checker_;
 588
 589   scoped_refptr<Fence> current_read_lock_fence_;
 590   bool use_rgba_4444_texture_format_;
 591
 592   const size_t id_allocation_chunk_size_;
 593   scoped_ptr<IdAllocator> texture_id_allocator_;
 594   scoped_ptr<IdAllocator> buffer_id_allocator_;
 595
 596   bool use_sync_query_;
 597   // Fence used for CopyResource if CHROMIUM_sync_query is not supported.
 598   scoped_refptr<SynchronousFence> synchronous_fence_;
 599
 600   DISALLOW_COPY_AND_ASSIGN(ResourceProvider);
 601 };
 602
 603 // TODO(epenner): Move these format conversions to resource_format.h
 604 // once that builds on mac (npapi.h currently #includes OpenGL.h).
 605 inline unsigned BitsPerPixel(ResourceFormat format) {
 606   switch (format) {
 607     case BGRA_8888:
 608     case RGBA_8888:
 609       return 32;
 610     case RGBA_4444:
 611     case RGB_565:
 612       return 16;
 613     case ALPHA_8:
 614     case LUMINANCE_8:
 615     case RED_8:
 616       return 8;
 617     case ETC1:
 618       return 4;
 619   }
 620   NOTREACHED();
 621   return 0;
 622 }
 623
 624 inline GLenum GLDataType(ResourceFormat format) {
 625   DCHECK_LE(format, RESOURCE_FORMAT_MAX);
 626   static const unsigned format_gl_data_type[RESOURCE_FORMAT_MAX + 1] = {
 627       GL_UNSIGNED_BYTE,           // RGBA_8888
 628       GL_UNSIGNED_SHORT_4_4_4_4,  // RGBA_4444
 629       GL_UNSIGNED_BYTE,           // BGRA_8888
 630       GL_UNSIGNED_BYTE,           // ALPHA_8
 631       GL_UNSIGNED_BYTE,           // LUMINANCE_8
 632       GL_UNSIGNED_SHORT_5_6_5,    // RGB_565,
 633       GL_UNSIGNED_BYTE,           // ETC1
 634       GL_UNSIGNED_BYTE            // RED_8
 635   };
 636   return format_gl_data_type[format];
 637 }
 638
 639 inline GLenum GLDataFormat(ResourceFormat format) {
 640   DCHECK_LE(format, RESOURCE_FORMAT_MAX);
 641   static const unsigned format_gl_data_format[RESOURCE_FORMAT_MAX + 1] = {
 642       GL_RGBA,           // RGBA_8888
 643       GL_RGBA,           // RGBA_4444
 644       GL_BGRA_EXT,       // BGRA_8888
 645       GL_ALPHA,          // ALPHA_8
 646       GL_LUMINANCE,      // LUMINANCE_8
 647       GL_RGB,            // RGB_565
 648       GL_ETC1_RGB8_OES,  // ETC1
 649       GL_RED_EXT         // RED_8
 650   };
 651   return format_gl_data_format[format];
 652 }
 653
 654 inline GLenum GLInternalFormat(ResourceFormat format) {
 655   return GLDataFormat(format);
 656 }
 657
 658 }  // namespace cc
 659
 660 #endif  // CC_RESOURCES_RESOURCE_PROVIDER_H_