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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_RENDERER_PEPPER_PPB_IMAGE_DATA_IMPL_H_
#define CONTENT_RENDERER_PEPPER_PPB_IMAGE_DATA_IMPL_H_
#include <stdint.h>
#include <memory>
#include "base/macros.h"
#include "base/memory/shared_memory.h"
#include "content/common/content_export.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/SkBitmap.h"
class SkCanvas;
class TransportDIB;
namespace base {
class SharedMemory;
}
namespace content {
class CONTENT_EXPORT PPB_ImageData_Impl
: public ppapi::Resource,
public ppapi::PPB_ImageData_Shared,
public 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, or trusted plugins when the PlatformCanvas isn't needed). 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 TransportDIB* GetTransportDIB() const = 0;
virtual void* Map() = 0;
virtual void Unmap() = 0;
virtual int32_t GetSharedMemory(base::SharedMemory** shm,
uint32_t* byte_count) = 0;
virtual SkCanvas* GetCanvas() = 0;
virtual 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).
PPB_ImageData_Impl(PP_Instance instance,
PPB_ImageData_Shared::ImageDataType type);
// Constructor used for unittests. The ImageData is always allocated locally.
struct ForTest {};
PPB_ImageData_Impl(PP_Instance instance, ForTest);
bool Init(PP_ImageDataFormat format,
int width,
int height,
bool init_to_zero);
static PP_Resource Create(PP_Instance pp_instance,
PPB_ImageData_Shared::ImageDataType type,
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;
TransportDIB* GetTransportDIB() const;
// Resource override.
ppapi::thunk::PPB_ImageData_API* AsPPB_ImageData_API() override;
// PPB_ImageData_API implementation.
PP_Bool Describe(PP_ImageDataDesc* desc) override;
void* Map() override;
void Unmap() override;
int32_t GetSharedMemory(base::SharedMemory** shm,
uint32_t* byte_count) override;
SkCanvas* GetCanvas() override;
void SetIsCandidateForReuse() override;
// Returns an *empty* bitmap on error.
// Users must call SkBitmap::lockPixels() before SkBitmap::getPixels();
// unlockPixels() will be automatically invoked if necessary when the
// bitmap goes out of scope.
SkBitmap GetMappedBitmap() const;
private:
~PPB_ImageData_Impl() override;
PP_ImageDataFormat format_;
int width_;
int height_;
std::unique_ptr<Backend> backend_;
DISALLOW_COPY_AND_ASSIGN(PPB_ImageData_Impl);
};
class ImageDataPlatformBackend : public PPB_ImageData_Impl::Backend {
public:
// |is_browser_allocated| indicates whether the backing shared memory should
// be allocated by the browser process.
ImageDataPlatformBackend();
~ImageDataPlatformBackend() override;
// PPB_ImageData_Impl::Backend implementation.
bool Init(PPB_ImageData_Impl* impl,
PP_ImageDataFormat format,
int width,
int height,
bool init_to_zero) override;
bool IsMapped() const override;
TransportDIB* GetTransportDIB() const override;
void* Map() override;
void Unmap() override;
int32_t GetSharedMemory(base::SharedMemory** shm,
uint32_t* byte_count) override;
SkCanvas* GetCanvas() override;
SkBitmap GetMappedBitmap() const override;
private:
// This will be NULL before initialization, and if this PPB_ImageData_Impl is
// swapped with another.
int width_;
int height_;
std::unique_ptr<TransportDIB> dib_;
// When the device is mapped, this is the image. Null when umapped.
std::unique_ptr<SkCanvas> mapped_canvas_;
DISALLOW_COPY_AND_ASSIGN(ImageDataPlatformBackend);
};
class ImageDataSimpleBackend : public PPB_ImageData_Impl::Backend {
public:
ImageDataSimpleBackend();
~ImageDataSimpleBackend() override;
// PPB_ImageData_Impl::Backend implementation.
bool Init(PPB_ImageData_Impl* impl,
PP_ImageDataFormat format,
int width,
int height,
bool init_to_zero) override;
bool IsMapped() const override;
TransportDIB* GetTransportDIB() const override;
void* Map() override;
void Unmap() override;
int32_t GetSharedMemory(base::SharedMemory** shm,
uint32_t* byte_count) override;
SkCanvas* GetCanvas() override;
SkBitmap GetMappedBitmap() const override;
private:
std::unique_ptr<base::SharedMemory> shared_memory_;
// skia_bitmap_ is backed by shared_memory_.
SkBitmap skia_bitmap_;
std::unique_ptr<SkCanvas> skia_canvas_;
uint32_t map_count_;
DISALLOW_COPY_AND_ASSIGN(ImageDataSimpleBackend);
};
// 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 content
#endif // CONTENT_RENDERER_PEPPER_PPB_IMAGE_DATA_IMPL_H_
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