Introduce components/display_compositor

content/browser/compositor/gl_helper.h

Index: content/browser/compositor/gl_helper.h
diff --git a/content/browser/compositor/gl_helper.h b/content/browser/compositor/gl_helper.h
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-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CONTENT_BROWSER_COMPOSITOR_GL_HELPER_H_
-#define CONTENT_BROWSER_COMPOSITOR_GL_HELPER_H_
-
-#include <memory>
-
-#include "base/atomicops.h"
-#include "base/callback.h"
-#include "base/macros.h"
-#include "content/common/content_export.h"
-#include "gpu/command_buffer/client/gles2_interface.h"
-#include "gpu/command_buffer/common/mailbox_holder.h"
-#include "third_party/skia/include/core/SkBitmap.h"
-
-namespace gfx {
-class Point;
-class Rect;
-class Size;
-}
-
-namespace gpu {
-class ContextSupport;
-struct Mailbox;
-}
-
-class SkRegion;
-
-namespace content {
-
-class GLHelperScaling;
-
-class ScopedGLuint {
- public:
-  typedef void (gpu::gles2::GLES2Interface::*GenFunc)(GLsizei n, GLuint* ids);
-  typedef void (gpu::gles2::GLES2Interface::*DeleteFunc)(GLsizei n,
-                                                         const GLuint* ids);
-  ScopedGLuint(gpu::gles2::GLES2Interface* gl,
-               GenFunc gen_func,
-               DeleteFunc delete_func)
-      : gl_(gl), id_(0u), delete_func_(delete_func) {
-    (gl_->*gen_func)(1, &id_);
-  }
-
-  operator GLuint() const { return id_; }
-
-  GLuint id() const { return id_; }
-
-  ~ScopedGLuint() {
-    if (id_ != 0) {
-      (gl_->*delete_func_)(1, &id_);
-    }
-  }
-
- private:
-  gpu::gles2::GLES2Interface* gl_;
-  GLuint id_;
-  DeleteFunc delete_func_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScopedGLuint);
-};
-
-class ScopedBuffer : public ScopedGLuint {
- public:
-  explicit ScopedBuffer(gpu::gles2::GLES2Interface* gl)
-      : ScopedGLuint(gl,
-                     &gpu::gles2::GLES2Interface::GenBuffers,
-                     &gpu::gles2::GLES2Interface::DeleteBuffers) {}
-};
-
-class ScopedFramebuffer : public ScopedGLuint {
- public:
-  explicit ScopedFramebuffer(gpu::gles2::GLES2Interface* gl)
-      : ScopedGLuint(gl,
-                     &gpu::gles2::GLES2Interface::GenFramebuffers,
-                     &gpu::gles2::GLES2Interface::DeleteFramebuffers) {}
-};
-
-class ScopedTexture : public ScopedGLuint {
- public:
-  explicit ScopedTexture(gpu::gles2::GLES2Interface* gl)
-      : ScopedGLuint(gl,
-                     &gpu::gles2::GLES2Interface::GenTextures,
-                     &gpu::gles2::GLES2Interface::DeleteTextures) {}
-};
-
-template <GLenum Target>
-class ScopedBinder {
- public:
-  typedef void (gpu::gles2::GLES2Interface::*BindFunc)(GLenum target,
-                                                       GLuint id);
-  ScopedBinder(gpu::gles2::GLES2Interface* gl, GLuint id, BindFunc bind_func)
-      : gl_(gl), bind_func_(bind_func) {
-    (gl_->*bind_func_)(Target, id);
-  }
-
-  virtual ~ScopedBinder() { (gl_->*bind_func_)(Target, 0); }
-
- private:
-  gpu::gles2::GLES2Interface* gl_;
-  BindFunc bind_func_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScopedBinder);
-};
-
-template <GLenum Target>
-class ScopedBufferBinder : ScopedBinder<Target> {
- public:
-  ScopedBufferBinder(gpu::gles2::GLES2Interface* gl, GLuint id)
-      : ScopedBinder<Target>(gl, id, &gpu::gles2::GLES2Interface::BindBuffer) {}
-};
-
-template <GLenum Target>
-class ScopedFramebufferBinder : ScopedBinder<Target> {
- public:
-  ScopedFramebufferBinder(gpu::gles2::GLES2Interface* gl, GLuint id)
-      : ScopedBinder<Target>(gl,
-                             id,
-                             &gpu::gles2::GLES2Interface::BindFramebuffer) {}
-};
-
-template <GLenum Target>
-class ScopedTextureBinder : ScopedBinder<Target> {
- public:
-  ScopedTextureBinder(gpu::gles2::GLES2Interface* gl, GLuint id)
-      : ScopedBinder<Target>(gl, id, &gpu::gles2::GLES2Interface::BindTexture) {
-  }
-};
-
-class ReadbackYUVInterface;
-class GLHelperReadbackSupport;
-
-// Provides higher level operations on top of the gpu::gles2::GLES2Interface
-// interfaces.
-class CONTENT_EXPORT GLHelper {
- public:
-  GLHelper(gpu::gles2::GLES2Interface* gl,
-           gpu::ContextSupport* context_support);
-  ~GLHelper();
-
-  enum ScalerQuality {
-    // Bilinear single pass, fastest possible.
-    SCALER_QUALITY_FAST = 1,
-
-    // Bilinear upscale + N * 50% bilinear downscales.
-    // This is still fast enough for most purposes and
-    // Image quality is nearly as good as the BEST option.
-    SCALER_QUALITY_GOOD = 2,
-
-    // Bicubic upscale + N * 50% bicubic downscales.
-    // Produces very good quality scaled images, but it's
-    // 2-8x slower than the "GOOD" quality, so it's not always
-    // worth it.
-    SCALER_QUALITY_BEST = 3,
-  };
-
-  // Copies the block of pixels specified with |src_subrect| from |src_texture|,
-  // scales it to |dst_size|, and writes it into |out|.
-  // |src_size| is the size of |src_texture|. The result is in |out_color_type|
-  // format and is potentially flipped vertically to make it a correct image
-  // representation.  |callback| is invoked with the copy result when the copy
-  // operation has completed.
-  // Note that the src_texture will have the min/mag filter set to GL_LINEAR
-  // and wrap_s/t set to CLAMP_TO_EDGE in this call.
-  void CropScaleReadbackAndCleanTexture(
-      GLuint src_texture,
-      const gfx::Size& src_size,
-      const gfx::Rect& src_subrect,
-      const gfx::Size& dst_size,
-      unsigned char* out,
-      const SkColorType out_color_type,
-      const base::Callback<void(bool)>& callback,
-      GLHelper::ScalerQuality quality);
-
-  // Copies the block of pixels specified with |src_subrect| from |src_mailbox|,
-  // scales it to |dst_size|, and writes it into |out|.
-  // |src_size| is the size of |src_mailbox|. The result is in |out_color_type|
-  // format and is potentially flipped vertically to make it a correct image
-  // representation.  |callback| is invoked with the copy result when the copy
-  // operation has completed.
-  // Note that the texture bound to src_mailbox will have the min/mag filter set
-  // to GL_LINEAR and wrap_s/t set to CLAMP_TO_EDGE in this call. src_mailbox is
-  // assumed to be GL_TEXTURE_2D.
-  void CropScaleReadbackAndCleanMailbox(
-      const gpu::Mailbox& src_mailbox,
-      const gpu::SyncToken& sync_token,
-      const gfx::Size& src_size,
-      const gfx::Rect& src_subrect,
-      const gfx::Size& dst_size,
-      unsigned char* out,
-      const SkColorType out_color_type,
-      const base::Callback<void(bool)>& callback,
-      GLHelper::ScalerQuality quality);
-
-  // Copies the texture data out of |texture| into |out|.  |size| is the
-  // size of the texture.  No post processing is applied to the pixels.  The
-  // texture is assumed to have a format of GL_RGBA with a pixel type of
-  // GL_UNSIGNED_BYTE.  This is a blocking call that calls glReadPixels on the
-  // current OpenGL context.
-  void ReadbackTextureSync(GLuint texture,
-                           const gfx::Rect& src_rect,
-                           unsigned char* out,
-                           SkColorType format);
-
-  void ReadbackTextureAsync(GLuint texture,
-                            const gfx::Size& dst_size,
-                            unsigned char* out,
-                            SkColorType color_type,
-                            const base::Callback<void(bool)>& callback);
-
-  // Creates a copy of the specified texture. |size| is the size of the texture.
-  // Note that the src_texture will have the min/mag filter set to GL_LINEAR
-  // and wrap_s/t set to CLAMP_TO_EDGE in this call.
-  GLuint CopyTexture(GLuint texture, const gfx::Size& size);
-
-  // Creates a scaled copy of the specified texture. |src_size| is the size of
-  // the texture and |dst_size| is the size of the resulting copy.
-  // Note that the src_texture will have the min/mag filter set to GL_LINEAR
-  // and wrap_s/t set to CLAMP_TO_EDGE in this call.
-  GLuint CopyAndScaleTexture(GLuint texture,
-                             const gfx::Size& src_size,
-                             const gfx::Size& dst_size,
-                             bool vertically_flip_texture,
-                             ScalerQuality quality);
-
-  // Returns the shader compiled from the source.
-  GLuint CompileShaderFromSource(const GLchar* source, GLenum type);
-
-  // Copies all pixels from |previous_texture| into |texture| that are
-  // inside the region covered by |old_damage| but not part of |new_damage|.
-  void CopySubBufferDamage(GLenum target,
-                           GLuint texture,
-                           GLuint previous_texture,
-                           const SkRegion& new_damage,
-                           const SkRegion& old_damage);
-
-  // Simply creates a texture.
-  GLuint CreateTexture();
-  // Deletes a texture.
-  void DeleteTexture(GLuint texture_id);
-
-  // Inserts a fence sync, flushes, and generates a sync token.
-  void GenerateSyncToken(gpu::SyncToken* sync_token);
-
-  // Wait for the sync token before executing further GL commands.
-  void WaitSyncToken(const gpu::SyncToken& sync_token);
-
-  // Creates a mailbox holder that is attached to the given texture id, with a
-  // sync point to wait on before using the mailbox. Returns a holder with an
-  // empty mailbox on failure.
-  // Note the texture is assumed to be GL_TEXTURE_2D.
-  gpu::MailboxHolder ProduceMailboxHolderFromTexture(GLuint texture_id);
-
-  // Creates a texture and consumes a mailbox into it. Returns 0 on failure.
-  // Note the mailbox is assumed to be GL_TEXTURE_2D.
-  GLuint ConsumeMailboxToTexture(const gpu::Mailbox& mailbox,
-                                 const gpu::SyncToken& sync_token);
-
-  // Resizes the texture's size to |size|.
-  void ResizeTexture(GLuint texture, const gfx::Size& size);
-
-  // Copies the framebuffer data given in |rect| to |texture|.
-  void CopyTextureSubImage(GLuint texture, const gfx::Rect& rect);
-
-  // Copies the all framebuffer data to |texture|. |size| specifies the
-  // size of the framebuffer.
-  void CopyTextureFullImage(GLuint texture, const gfx::Size& size);
-
-  // Flushes GL commands.
-  void Flush();
-
-  // Force commands in the current command buffer to be executed before commands
-  // in other command buffers from the same process (ie channel to the GPU
-  // process).
-  void InsertOrderingBarrier();
-
-  // A scaler will cache all intermediate textures and programs
-  // needed to scale from a specified size to a destination size.
-  // If the source or destination sizes changes, you must create
-  // a new scaler.
-  class CONTENT_EXPORT ScalerInterface {
-   public:
-    ScalerInterface() {}
-    virtual ~ScalerInterface() {}
-
-    // Note that the src_texture will have the min/mag filter set to GL_LINEAR
-    // and wrap_s/t set to CLAMP_TO_EDGE in this call.
-    virtual void Scale(GLuint source_texture, GLuint dest_texture) = 0;
-    virtual const gfx::Size& SrcSize() = 0;
-    virtual const gfx::Rect& SrcSubrect() = 0;
-    virtual const gfx::Size& DstSize() = 0;
-  };
-
-  // Note that the quality may be adjusted down if texture
-  // allocations fail or hardware doesn't support the requtested
-  // quality. Note that ScalerQuality enum is arranged in
-  // numerical order for simplicity.
-  ScalerInterface* CreateScaler(ScalerQuality quality,
-                                const gfx::Size& src_size,
-                                const gfx::Rect& src_subrect,
-                                const gfx::Size& dst_size,
-                                bool vertically_flip_texture,
-                                bool swizzle);
-
-  // Create a readback pipeline that will scale a subsection of the source
-  // texture, then convert it to YUV422 planar form and then read back that.
-  // This reduces the amount of memory read from GPU to CPU memory by a factor
-  // 2.6, which can be quite handy since readbacks have very limited speed
-  // on some platforms. All values in |dst_size| must be a multiple of two. If
-  // |use_mrt| is true, the pipeline will try to optimize the YUV conversion
-  // using the multi-render-target extension. |use_mrt| should only be set to
-  // false for testing.
-  ReadbackYUVInterface* CreateReadbackPipelineYUV(ScalerQuality quality,
-                                                  const gfx::Size& src_size,
-                                                  const gfx::Rect& src_subrect,
-                                                  const gfx::Size& dst_size,
-                                                  bool flip_vertically,
-                                                  bool use_mrt);
-
-  // Returns the maximum number of draw buffers available,
-  // 0 if GL_EXT_draw_buffers is not available.
-  GLint MaxDrawBuffers();
-
-  // Checks whether the readbback is supported for texture with the
-  // matching config. This doesnt check for cross format readbacks.
-  bool IsReadbackConfigSupported(SkColorType texture_format);
-
- protected:
-  class CopyTextureToImpl;
-
-  // Creates |copy_texture_to_impl_| if NULL.
-  void InitCopyTextToImpl();
-  // Creates |scaler_impl_| if NULL.
-  void InitScalerImpl();
-
-  enum ReadbackSwizzle { kSwizzleNone = 0, kSwizzleBGRA };
-
-  gpu::gles2::GLES2Interface* gl_;
-  gpu::ContextSupport* context_support_;
-  std::unique_ptr<CopyTextureToImpl> copy_texture_to_impl_;
-  std::unique_ptr<GLHelperScaling> scaler_impl_;
-  std::unique_ptr<GLHelperReadbackSupport> readback_support_;
-
-  DISALLOW_COPY_AND_ASSIGN(GLHelper);
-};
-
-// Similar to a ScalerInterface, a yuv readback pipeline will
-// cache a scaler and all intermediate textures and frame buffers
-// needed to scale, crop, letterbox and read back a texture from
-// the GPU into CPU-accessible RAM. A single readback pipeline
-// can handle multiple outstanding readbacks at the same time, but
-// if the source or destination sizes change, you'll need to create
-// a new readback pipeline.
-class CONTENT_EXPORT ReadbackYUVInterface {
- public:
-  ReadbackYUVInterface() {}
-  virtual ~ReadbackYUVInterface() {}
-
-  // Note that |target| must use YV12 format.  |paste_location| specifies where
-  // the captured pixels that are read back will be placed in the video frame.
-  // The region defined by the |paste_location| and the |dst_size| specified in
-  // the call to CreateReadbackPipelineYUV() must be fully contained within
-  // |target->visible_rect()|.
-  virtual void ReadbackYUV(const gpu::Mailbox& mailbox,
-                           const gpu::SyncToken& sync_token,
-                           const gfx::Rect& target_visible_rect,
-                           int y_plane_row_stride_bytes,
-                           unsigned char* y_plane_data,
-                           int u_plane_row_stride_bytes,
-                           unsigned char* u_plane_data,
-                           int v_plane_row_stride_bytes,
-                           unsigned char* v_plane_data,
-                           const gfx::Point& paste_location,
-                           const base::Callback<void(bool)>& callback) = 0;
-  virtual GLHelper::ScalerInterface* scaler() = 0;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_COMPOSITOR_GL_HELPER_H_