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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 WEBKIT_PLUGINS_PPAPI_PPB_IMAGE_DATA_IMPL_H_
#define WEBKIT_PLUGINS_PPAPI_PPB_IMAGE_DATA_IMPL_H_
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "ppapi/c/ppb_image_data.h"
#include "ppapi/shared_impl/ppb_image_data_shared.h"
#include "ppapi/shared_impl/resource.h"
#include "ppapi/thunk/ppb_image_data_api.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "webkit/plugins/ppapi/plugin_delegate.h"
#include "webkit/plugins/webkit_plugins_export.h"
class SkBitmap;
class SkCanvas;
namespace webkit {
namespace ppapi {
class WEBKIT_PLUGINS_EXPORT PPB_ImageData_Impl
: public ::ppapi::Resource,
public ::ppapi::PPB_ImageData_Shared,
public NON_EXPORTED_BASE(::ppapi::thunk::PPB_ImageData_API) {
public:
// We delegate most of our implementation to a back-end class that either uses
// a PlatformCanvas (for most trusted stuff) or bare shared memory (for use by
// NaCl). This makes it cheap & easy to implement Swap.
class Backend {
public:
virtual ~Backend() {};
virtual bool Init(PPB_ImageData_Impl* impl, PP_ImageDataFormat format,
int width, int height, bool init_to_zero) = 0;
virtual bool IsMapped() const = 0;
virtual PluginDelegate::PlatformImage2D* PlatformImage() const = 0;
virtual void* Map() = 0;
virtual void Unmap() = 0;
virtual int32_t GetSharedMemory(int* handle, uint32_t* byte_count) = 0;
virtual SkCanvas* GetPlatformCanvas() = 0;
virtual SkCanvas* GetCanvas() = 0;
virtual const SkBitmap* GetMappedBitmap() const = 0;
};
// If you call this constructor, you must also call Init before use. Normally
// you should use the static Create function, but this constructor is needed
// for some internal uses of ImageData (like Graphics2D).
enum ImageDataType { PLATFORM, NACL };
PPB_ImageData_Impl(PP_Instance instance, ImageDataType type);
virtual ~PPB_ImageData_Impl();
bool Init(PP_ImageDataFormat format,
int width, int height,
bool init_to_zero);
// Create an ImageData backed by a PlatformCanvas. You must use this if you
// intend the ImageData to be usable in platform-specific APIs (like font
// rendering or rendering widgets like scrollbars).
static PP_Resource CreatePlatform(PP_Instance pp_instance,
PP_ImageDataFormat format,
const PP_Size& size,
PP_Bool init_to_zero);
// Use this to create an ImageData for use with NaCl. This is backed by a
// simple shared memory buffer.
static PP_Resource CreateNaCl(PP_Instance pp_instance,
PP_ImageDataFormat format,
const PP_Size& size,
PP_Bool init_to_zero);
int width() const { return width_; }
int height() const { return height_; }
// Returns the image format.
PP_ImageDataFormat format() const { return format_; }
// Returns true if this image is mapped. False means that the image is either
// invalid or not mapped. See ImageDataAutoMapper below.
bool IsMapped() const;
PluginDelegate::PlatformImage2D* PlatformImage() const;
// Resource override.
virtual ::ppapi::thunk::PPB_ImageData_API* AsPPB_ImageData_API() OVERRIDE;
// PPB_ImageData_API implementation.
virtual PP_Bool Describe(PP_ImageDataDesc* desc) OVERRIDE;
virtual void* Map() OVERRIDE;
virtual void Unmap() OVERRIDE;
virtual int32_t GetSharedMemory(int* handle, uint32_t* byte_count) OVERRIDE;
virtual SkCanvas* GetPlatformCanvas() OVERRIDE;
virtual SkCanvas* GetCanvas() OVERRIDE;
virtual void SetIsCandidateForReuse() OVERRIDE;
const SkBitmap* GetMappedBitmap() const;
private:
PP_ImageDataFormat format_;
int width_;
int height_;
scoped_ptr<Backend> backend_;
DISALLOW_COPY_AND_ASSIGN(PPB_ImageData_Impl);
};
class ImageDataPlatformBackend : public PPB_ImageData_Impl::Backend {
public:
ImageDataPlatformBackend();
virtual ~ImageDataPlatformBackend();
// PPB_ImageData_Impl::Backend implementation.
virtual bool Init(PPB_ImageData_Impl* impl, PP_ImageDataFormat format,
int width, int height, bool init_to_zero) OVERRIDE;
virtual bool IsMapped() const OVERRIDE;
virtual PluginDelegate::PlatformImage2D* PlatformImage() const OVERRIDE;
virtual void* Map() OVERRIDE;
virtual void Unmap() OVERRIDE;
virtual int32_t GetSharedMemory(int* handle, uint32_t* byte_count) OVERRIDE;
virtual SkCanvas* GetPlatformCanvas() OVERRIDE;
virtual SkCanvas* GetCanvas() OVERRIDE;
virtual const SkBitmap* GetMappedBitmap() const OVERRIDE;
private:
// This will be NULL before initialization, and if this PPB_ImageData_Impl is
// swapped with another.
scoped_ptr<PluginDelegate::PlatformImage2D> platform_image_;
// When the device is mapped, this is the image. Null when umapped.
scoped_ptr<SkCanvas> mapped_canvas_;
DISALLOW_COPY_AND_ASSIGN(ImageDataPlatformBackend);
};
class ImageDataNaClBackend : public PPB_ImageData_Impl::Backend {
public:
ImageDataNaClBackend();
virtual ~ImageDataNaClBackend();
// PPB_ImageData_Impl::Backend implementation.
bool Init(PPB_ImageData_Impl* impl, PP_ImageDataFormat format,
int width, int height, bool init_to_zero) OVERRIDE;
virtual bool IsMapped() const OVERRIDE;
PluginDelegate::PlatformImage2D* PlatformImage() const OVERRIDE;
virtual void* Map() OVERRIDE;
virtual void Unmap() OVERRIDE;
virtual int32_t GetSharedMemory(int* handle, uint32_t* byte_count) OVERRIDE;
virtual SkCanvas* GetPlatformCanvas() OVERRIDE;
virtual SkCanvas* GetCanvas() OVERRIDE;
virtual const SkBitmap* GetMappedBitmap() const OVERRIDE;
private:
scoped_ptr<base::SharedMemory> shared_memory_;
// skia_bitmap_ is backed by shared_memory_.
SkBitmap skia_bitmap_;
scoped_ptr<SkCanvas> skia_canvas_;
uint32 map_count_;
DISALLOW_COPY_AND_ASSIGN(ImageDataNaClBackend);
};
// Manages mapping an image resource if necessary. Use this to ensure the
// image is mapped. The destructor will put the image back into the previous
// state. You must check is_valid() to make sure the image was successfully
// mapped before using it.
//
// Example:
// ImageDataAutoMapper mapper(image_data);
// if (!mapper.is_valid())
// return utter_failure;
// image_data->mapped_canvas()->blah(); // Guaranteed valid.
class ImageDataAutoMapper {
public:
explicit ImageDataAutoMapper(PPB_ImageData_Impl* image_data)
: image_data_(image_data) {
if (image_data_->IsMapped()) {
is_valid_ = true;
needs_unmap_ = false;
} else {
is_valid_ = needs_unmap_ = !!image_data_->Map();
}
}
~ImageDataAutoMapper() {
if (needs_unmap_)
image_data_->Unmap();
}
// Check this to see if the image was successfully mapped. If this is false,
// the image could not be mapped and is unusable.
bool is_valid() const { return is_valid_; }
private:
PPB_ImageData_Impl* image_data_;
bool is_valid_;
bool needs_unmap_;
DISALLOW_COPY_AND_ASSIGN(ImageDataAutoMapper);
};
} // namespace ppapi
} // namespace webkit
#endif // WEBKIT_PLUGINS_PPAPI_PPB_IMAGE_DATA_IMPL_H_
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