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// Copyright (c) 2010 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 UI_GFX_SCOPED_IMAGE_H_
#define UI_GFX_SCOPED_IMAGE_H_
#pragma once
#include "base/basictypes.h"
#include "build/build_config.h"
#include "gfx/native_widget_types.h"
#include "third_party/skia/include/core/SkBitmap.h"
#if defined(OS_LINUX)
#include <glib-object.h>
#elif defined(OS_MACOSX)
#include "base/mac/mac_util.h"
#endif
namespace gfx {
namespace internal {
// ScopedImage is class that encapsulates one of the three platform-specific
// images used: SkBitmap, NSImage, and GdkPixbuf. This is the abstract interface
// that all ScopedImages respond to. This wrapper expects to own the image it
// holds, unless it is Release()ed or Free()ed.
//
// This class is abstract and callers should use the specialized versions below,
// which are not in the internal namespace.
template <class ImageType>
class ScopedImage {
public:
virtual ~ScopedImage() {}
// Frees the actual image that this boxes.
virtual void Free() = 0;
// Returns the image that this boxes.
ImageType* Get() {
return image_;
}
// Frees the current image and sets a new one.
void Set(ImageType* new_image) {
Free();
image_ = new_image;
}
// Returns the image this boxes and relinquishes ownership.
ImageType* Release() {
ImageType* tmp = image_;
image_ = NULL;
return tmp;
}
protected:
explicit ScopedImage(ImageType* image) : image_(image) {}
ImageType* image_;
private:
DISALLOW_COPY_AND_ASSIGN(ScopedImage);
};
} // namespace internal
// Generic template.
template <class ImageType = gfx::NativeImageType>
class ScopedImage : public gfx::internal::ScopedImage<ImageType> {
public:
explicit ScopedImage(gfx::NativeImage image)
: gfx::internal::ScopedImage<ImageType>(image) {}
private:
DISALLOW_COPY_AND_ASSIGN(ScopedImage<ImageType>);
};
// Specialization for SkBitmap on all platforms.
template <>
class ScopedImage<SkBitmap> : public gfx::internal::ScopedImage<SkBitmap> {
public:
explicit ScopedImage(SkBitmap* image)
: gfx::internal::ScopedImage<SkBitmap>(image) {}
virtual ~ScopedImage() {
Free();
}
virtual void Free() {
delete image_;
image_ = NULL;
}
private:
DISALLOW_COPY_AND_ASSIGN(ScopedImage);
};
// Specialization for the NSImage type on Mac OS X.
#if defined(OS_MACOSX)
template <>
class ScopedImage<NSImage> : public gfx::internal::ScopedImage<NSImage> {
public:
explicit ScopedImage(NSImage* image)
: gfx::internal::ScopedImage<NSImage>(image) {}
virtual ~ScopedImage() {
Free();
}
virtual void Free() {
base::mac::NSObjectRelease(image_);
image_ = NULL;
}
private:
DISALLOW_COPY_AND_ASSIGN(ScopedImage);
};
#endif // defined(OS_MACOSX)
// Specialization for the GdkPixbuf type on Linux.
#if defined(OS_LINUX)
template <>
class ScopedImage<GdkPixbuf> : public gfx::internal::ScopedImage<GdkPixbuf> {
public:
explicit ScopedImage(GdkPixbuf* image)
: gfx::internal::ScopedImage<GdkPixbuf>(image) {}
virtual ~ScopedImage() {
Free();
}
virtual void Free() {
if (image_) {
g_object_unref(image_);
image_ = NULL;
}
}
private:
DISALLOW_COPY_AND_ASSIGN(ScopedImage);
};
#endif // defined(OS_LINUX)
// Typedef ScopedNativeImage to the default template argument. This allows for
// easy exchange between gfx::NativeImage and a gfx::ScopedNativeImage.
typedef ScopedImage<> ScopedNativeImage;
} // namespace gfx
#endif // UI_GFX_SCOPED_IMAGE_H_
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