94 lines
2.6 KiB
C++
94 lines
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsImageClipboard_h
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#define nsImageClipboard_h
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/* Things To Do 11/8/00
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Check image metrics, can we support them? Do we need to?
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Any other render format? HTML?
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*/
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#include "nsError.h"
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#include <windows.h>
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#include "nsCOMPtr.h"
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#include "imgIContainer.h"
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#include "nsIInputStream.h"
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//
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// nsImageToClipboard
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//
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// A utility class that takes an imgIContainer and does all the bitmap magic
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// to allow us to put it on the clipboard
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//
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class nsImageToClipboard
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{
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public:
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nsImageToClipboard(imgIContainer* aInImage, bool aWantDIBV5 = true);
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~nsImageToClipboard();
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// Call to get the actual bits that go on the clipboard. If |nullptr|, the
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// setup operations have failed.
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//
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// NOTE: The caller owns the handle and must delete it with ::GlobalRelease()
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nsresult GetPicture ( HANDLE* outBits ) ;
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private:
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// Computes # of bytes needed by a bitmap with the specified attributes.
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int32_t CalcSize(int32_t aHeight, int32_t aColors, WORD aBitsPerPixel, int32_t aSpanBytes);
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int32_t CalcSpanLength(uint32_t aWidth, uint32_t aBitCount);
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// Do the work
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nsresult CreateFromImage ( imgIContainer* inImage, HANDLE* outBitmap );
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nsCOMPtr<imgIContainer> mImage; // the image we're working with
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bool mWantDIBV5;
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}; // class nsImageToClipboard
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struct bitFields {
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uint32_t red;
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uint32_t green;
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uint32_t blue;
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uint8_t redLeftShift;
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uint8_t redRightShift;
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uint8_t greenLeftShift;
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uint8_t greenRightShift;
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uint8_t blueLeftShift;
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uint8_t blueRightShift;
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};
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//
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// nsImageFromClipboard
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//
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// A utility class that takes a DIB from the win32 clipboard and does
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// all the bitmap magic to convert it to a PNG or a JPEG in the form of a nsIInputStream
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//
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class nsImageFromClipboard
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{
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public:
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nsImageFromClipboard () ;
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~nsImageFromClipboard ( ) ;
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// Retrieve the newly created image
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nsresult GetEncodedImageStream (unsigned char * aClipboardData, const char * aMIMEFormat, nsIInputStream** outImage);
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private:
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void InvertRows(unsigned char * aInitialBuffer, uint32_t aSizeOfBuffer, uint32_t aNumBytesPerRow);
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nsresult ConvertColorBitMap(unsigned char * aInputBuffer, PBITMAPINFO pBitMapInfo, unsigned char * aOutBuffer);
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void CalcBitmask(uint32_t aMask, uint8_t& aBegin, uint8_t& aLength);
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void CalcBitShift(bitFields * aColorMask);
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}; // nsImageFromClipboard
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#endif
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