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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 WEBKIT_GLUE_PLUGINS_PEPPER_IMAGE_DATA_H_
#define WEBKIT_GLUE_PLUGINS_PEPPER_IMAGE_DATA_H_
#include "base/basictypes.h"
#include "base/scoped_ptr.h"
#include "third_party/ppapi/c/ppb_image_data.h"
#include "webkit/glue/plugins/pepper_plugin_delegate.h"
#include "webkit/glue/plugins/pepper_resource.h"
namespace skia {
class PlatformCanvas;
}
class SkBitmap;
namespace pepper {
class ImageData : public Resource {
public:
explicit ImageData(PluginModule* module);
virtual ~ImageData();
int width() const { return width_; }
int height() const { return height_; }
// Returns the image format. Currently there is only one format so this
// always returns the same thing. But if you care about the formation, you
// should probably check this so when we support multiple formats, we can't
// forget to update your code.
PP_ImageDataFormat format() const { return PP_IMAGEDATAFORMAT_BGRA_PREMUL; }
// Returns true if this image is mapped. False means that the image is either
// invalid or not mapped. See ImageDataAutoMapper below.
bool is_mapped() const { return !!mapped_canvas_.get(); }
// Returns a pointer to the interface implementing PPB_ImageData that is
// exposed to the plugin.
static const PPB_ImageData* GetInterface();
// Resource overrides.
ImageData* AsImageData() { return this; }
// PPB_ImageData implementation.
bool Init(PP_ImageDataFormat format,
int width, int height,
bool init_to_zero);
void Describe(PP_ImageDataDesc* desc) const;
void* Map();
void Unmap();
// The mapped bitmap and canvas will be NULL if the image is not mapped.
skia::PlatformCanvas* mapped_canvas() const { return mapped_canvas_.get(); }
const SkBitmap* GetMappedBitmap() const;
// Swaps the guts of this image data with another.
void Swap(ImageData* other);
private:
// This will be NULL before initialization, and if this ImageData is
// swapped with another.
scoped_ptr<PluginDelegate::PlatformImage2D> platform_image_;
// When the device is mapped, this is the image. Null when umapped.
scoped_ptr<skia::PlatformCanvas> mapped_canvas_;
int width_;
int height_;
DISALLOW_COPY_AND_ASSIGN(ImageData);
};
// 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:
ImageDataAutoMapper(ImageData* image_data) : image_data_(image_data) {
if (image_data_->is_mapped()) {
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:
ImageData* image_data_;
bool is_valid_;
bool needs_unmap_;
DISALLOW_COPY_AND_ASSIGN(ImageDataAutoMapper);
};
} // namespace pepper
#endif // WEBKIT_GLUE_PLUGINS_PEPPER_IMAGE_DATA_H_
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