src/include/cef_image.h

// Copyright (c) 2016 Marshall A. Greenblatt. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//    * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//    * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//    * Neither the name of Google Inc. nor the name Chromium Embedded
// Framework nor the names of its contributors may be used to endorse
// or promote products derived from this software without specific prior
// written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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//
// ---------------------------------------------------------------------------
//
// The contents of this file must follow a specific format in order to
// support the CEF translator tool. See the translator.README.txt file in the
// tools directory for more information.
//

#ifndef CEF_INCLUDE_CEF_IMAGE_H_
#define CEF_INCLUDE_CEF_IMAGE_H_
#pragma once

#include "include/cef_base.h"
#include "include/cef_values.h"

///
// Container for a single image represented at different scale factors. All
// image representations should be the same size in density independent pixel
// (DIP) units. For example, if the image at scale factor 1.0 is 100x100 pixels
// then the image at scale factor 2.0 should be 200x200 pixels -- both images
// will display with a DIP size of 100x100 units. The methods of this class can
// be called on any browser process thread.
///
/*--cef(source=library)--*/
class CefImage : public virtual CefBaseRefCounted {
 public:
  ///
  // Create a new CefImage. It will initially be empty. Use the Add*() methods
  // to add representations at different scale factors.
  ///
  /*--cef()--*/
  static CefRefPtr<CefImage> CreateImage();

  ///
  // Returns true if this Image is empty.
  ///
  /*--cef()--*/
  virtual bool IsEmpty() = 0;

  ///
  // Returns true if this Image and |that| Image share the same underlying
  // storage. Will also return true if both images are empty.
  ///
  /*--cef()--*/
  virtual bool IsSame(CefRefPtr<CefImage> that) = 0;

  ///
  // Add a bitmap image representation for |scale_factor|. Only 32-bit RGBA/BGRA
  // formats are supported. |pixel_width| and |pixel_height| are the bitmap
  // representation size in pixel coordinates. |pixel_data| is the array of
  // pixel data and should be |pixel_width| x |pixel_height| x 4 bytes in size.
  // |color_type| and |alpha_type| values specify the pixel format.
  ///
  /*--cef()--*/
  virtual bool AddBitmap(float scale_factor,
                         int pixel_width,
                         int pixel_height,
                         cef_color_type_t color_type,
                         cef_alpha_type_t alpha_type,
                         const void* pixel_data,
                         size_t pixel_data_size) = 0;

  ///
  // Add a PNG image representation for |scale_factor|. |png_data| is the image
  // data of size |png_data_size|. Any alpha transparency in the PNG data will
  // be maintained.
  ///
  /*--cef()--*/
  virtual bool AddPNG(float scale_factor,
                      const void* png_data,
                      size_t png_data_size) = 0;

  ///
  // Create a JPEG image representation for |scale_factor|. |jpeg_data| is the
  // image data of size |jpeg_data_size|. The JPEG format does not support
  // transparency so the alpha byte will be set to 0xFF for all pixels.
  ///
  /*--cef()--*/
  virtual bool AddJPEG(float scale_factor,
                       const void* jpeg_data,
                       size_t jpeg_data_size) = 0;

  ///
  // Returns the image width in density independent pixel (DIP) units.
  ///
  /*--cef()--*/
  virtual size_t GetWidth() = 0;

  ///
  // Returns the image height in density independent pixel (DIP) units.
  ///
  /*--cef()--*/
  virtual size_t GetHeight() = 0;

  ///
  // Returns true if this image contains a representation for |scale_factor|.
  ///
  /*--cef()--*/
  virtual bool HasRepresentation(float scale_factor) = 0;

  ///
  // Removes the representation for |scale_factor|. Returns true on success.
  ///
  /*--cef()--*/
  virtual bool RemoveRepresentation(float scale_factor) = 0;

  ///
  // Returns information for the representation that most closely matches
  // |scale_factor|. |actual_scale_factor| is the actual scale factor for the
  // representation. |pixel_width| and |pixel_height| are the representation
  // size in pixel coordinates. Returns true on success.
  ///
  /*--cef()--*/
  virtual bool GetRepresentationInfo(float scale_factor,
                                     float& actual_scale_factor,
                                     int& pixel_width,
                                     int& pixel_height) = 0;

  ///
  // Returns the bitmap representation that most closely matches |scale_factor|.
  // Only 32-bit RGBA/BGRA formats are supported. |color_type| and |alpha_type|
  // values specify the desired output pixel format. |pixel_width| and
  // |pixel_height| are the output representation size in pixel coordinates.
  // Returns a CefBinaryValue containing the pixel data on success or NULL on
  // failure.
  ///
  /*--cef()--*/
  virtual CefRefPtr<CefBinaryValue> GetAsBitmap(float scale_factor,
                                                cef_color_type_t color_type,
                                                cef_alpha_type_t alpha_type,
                                                int& pixel_width,
                                                int& pixel_height) = 0;

  ///
  // Returns the PNG representation that most closely matches |scale_factor|. If
  // |with_transparency| is true any alpha transparency in the image will be
  // represented in the resulting PNG data. |pixel_width| and |pixel_height| are
  // the output representation size in pixel coordinates. Returns a
  // CefBinaryValue containing the PNG image data on success or NULL on failure.
  ///
  /*--cef()--*/
  virtual CefRefPtr<CefBinaryValue> GetAsPNG(float scale_factor,
                                             bool with_transparency,
                                             int& pixel_width,
                                             int& pixel_height) = 0;

  ///
  // Returns the JPEG representation that most closely matches |scale_factor|.
  // |quality| determines the compression level with 0 == lowest and 100 ==
  // highest. The JPEG format does not support alpha transparency and the alpha
  // channel, if any, will be discarded. |pixel_width| and |pixel_height| are
  // the output representation size in pixel coordinates. Returns a
  // CefBinaryValue containing the JPEG image data on success or NULL on
  // failure.
  ///
  /*--cef()--*/
  virtual CefRefPtr<CefBinaryValue> GetAsJPEG(float scale_factor,
                                              int quality,
                                              int& pixel_width,
                                              int& pixel_height) = 0;
};

#endif  // CEF_INCLUDE_CEF_IMAGE_H_