The Tor Browser: widget/windows/nsImageClipboard.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #ifndef nsImageClipboard_h

     7 #define nsImageClipboard_h

     9 /* Things To Do 11/8/00

    11 Check image metrics, can we support them? Do we need to?

    12 Any other render format? HTML?

    14 */

    16 #include "nsError.h"

    17 #include <windows.h>

    19 #include "nsCOMPtr.h"

    20 #include "imgIContainer.h"

    21 #include "nsIInputStream.h"

    24 //

    25 // nsImageToClipboard

    26 //

    27 // A utility class that takes an imgIContainer and does all the bitmap magic

    28 // to allow us to put it on the clipboard

    29 //

    30 class nsImageToClipboard

    31 {

    32 public:

    33   nsImageToClipboard(imgIContainer* aInImage, bool aWantDIBV5 = true);

    34   ~nsImageToClipboard();

    36     // Call to get the actual bits that go on the clipboard. If |nullptr|, the

    37     // setup operations have failed.

    38     //

    39     // NOTE: The caller owns the handle and must delete it with ::GlobalRelease()

    40   nsresult GetPicture ( HANDLE* outBits ) ;

    42 private:

    44     // Computes # of bytes needed by a bitmap with the specified attributes.

    45   int32_t CalcSize(int32_t aHeight, int32_t aColors, WORD aBitsPerPixel, int32_t aSpanBytes);

    46   int32_t CalcSpanLength(uint32_t aWidth, uint32_t aBitCount);

    48     // Do the work

    49   nsresult CreateFromImage ( imgIContainer* inImage, HANDLE* outBitmap );

    51   nsCOMPtr<imgIContainer> mImage;            // the image we're working with

    52   bool mWantDIBV5;

    54 }; // class nsImageToClipboard

    57 struct bitFields {

    58     uint32_t red;

    59     uint32_t green;

    60     uint32_t blue;

    61     uint8_t redLeftShift;

    62     uint8_t redRightShift;

    63     uint8_t greenLeftShift;

    64     uint8_t greenRightShift;

    65     uint8_t blueLeftShift;

    66     uint8_t blueRightShift;

    67 };

    69 //

    70 // nsImageFromClipboard

    71 //

    72 // A utility class that takes a DIB from the win32 clipboard and does

    73 // all the bitmap magic to convert it to a PNG or a JPEG in the form of a nsIInputStream

    74 //

    75 class nsImageFromClipboard

    76 {

    77 public:

    78   nsImageFromClipboard () ;

    79   ~nsImageFromClipboard ( ) ;

    81     // Retrieve the newly created image

    82   nsresult GetEncodedImageStream (unsigned char * aClipboardData, const char * aMIMEFormat, nsIInputStream** outImage);

    84 private:

    86   void InvertRows(unsigned char * aInitialBuffer, uint32_t aSizeOfBuffer, uint32_t aNumBytesPerRow);

    87   nsresult ConvertColorBitMap(unsigned char * aInputBuffer, PBITMAPINFO pBitMapInfo, unsigned char * aOutBuffer);

    88   void CalcBitmask(uint32_t aMask, uint8_t& aBegin, uint8_t& aLength);

    89   void CalcBitShift(bitFields * aColorMask);

    91 }; // nsImageFromClipboard

    93 #endif

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