mozilla
/
gecko-dev
зеркало из https://github.com/mozilla/gecko-dev.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность
gecko-dev/widget/windows/nsImageClipboard.cpp

491 строка
16 KiB
C++
Исходник Ответственный История

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Mike Pinkerton <pinkerton@netscape.com>
* Gus Verdun <gustavoverdun@aol.com>
* Kathleen Brade <brade@comcast.net>
* Mark Smith <mcs@pearlcrescent.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsITransferable.h"
#include "nsImageClipboard.h"
#include "nsGfxCIID.h"
#include "nsMemory.h"
#include "prmem.h"
#include "imgIEncoder.h"
#include "nsLiteralString.h"
#include "nsComponentManagerUtils.h"
/* Things To Do 11/8/00
Check image metrics, can we support them? Do we need to?
Any other render format? HTML?
*/
//
// nsImageToClipboard ctor
//
// Given an imgIContainer, convert it to a DIB that is ready to go on the win32 clipboard
//
nsImageToClipboard :: nsImageToClipboard ( imgIContainer* inImage )
: mImage(inImage)
{
// nothing to do here
}
//
// nsImageToClipboard dtor
//
// Clean up after ourselves. We know that we have created the bitmap
// successfully if we still have a pointer to the header.
//
nsImageToClipboard::~nsImageToClipboard()
{
}
//
// GetPicture
//
// Call to get the actual bits that go on the clipboard. If an error
// ocurred during conversion, |outBits| will be null.
//
// NOTE: The caller owns the handle and must delete it with ::GlobalRelease()
//
nsresult
nsImageToClipboard :: GetPicture ( HANDLE* outBits )
{
NS_ASSERTION ( outBits, "Bad parameter" );
return CreateFromImage ( mImage, outBits );
} // GetPicture
//
// CalcSize
//
// Computes # of bytes needed by a bitmap with the specified attributes.
//
PRInt32
nsImageToClipboard :: CalcSize ( PRInt32 aHeight, PRInt32 aColors, WORD aBitsPerPixel, PRInt32 aSpanBytes )
{
PRInt32 HeaderMem = sizeof(BITMAPINFOHEADER);
// add size of pallette to header size
if (aBitsPerPixel < 16)
HeaderMem += aColors * sizeof(RGBQUAD);
if (aHeight < 0)
aHeight = -aHeight;
return (HeaderMem + (aHeight * aSpanBytes));
}
//
// CalcSpanLength
//
// Computes the span bytes for determining the overall size of the image
//
PRInt32
nsImageToClipboard::CalcSpanLength(PRUint32 aWidth, PRUint32 aBitCount)
{
PRInt32 spanBytes = (aWidth * aBitCount) >> 5;
if ((aWidth * aBitCount) & 0x1F)
spanBytes++;
spanBytes <<= 2;
return spanBytes;
}
//
// CreateFromImage
//
// Do the work to setup the bitmap header and copy the bits out of the
// image.
//
nsresult
nsImageToClipboard::CreateFromImage ( imgIContainer* inImage, HANDLE* outBitmap )
{
*outBitmap = nsnull;
nsRefPtr<gfxImageSurface> frame;
nsresult rv = inImage->CopyFrame(imgIContainer::FRAME_CURRENT,
imgIContainer::FLAG_SYNC_DECODE,
getter_AddRefs(frame));
if (NS_FAILED(rv))
return rv;
const PRUint32 imageSize = frame->GetDataSize();
const PRInt32 bitmapSize = sizeof(BITMAPINFOHEADER) + imageSize;
HGLOBAL glob = ::GlobalAlloc(GMEM_MOVEABLE | GMEM_DDESHARE | GMEM_ZEROINIT, bitmapSize);
if (!glob) {
return NS_ERROR_OUT_OF_MEMORY;
}
// Create the buffer where we'll copy the image bits (and header) into and lock it
void *data = (void*)::GlobalLock(glob);
BITMAPINFOHEADER *header = (BITMAPINFOHEADER*)data;
header->biSize = sizeof(BITMAPINFOHEADER);
header->biWidth = frame->Width();
header->biHeight = frame->Height();
header->biPlanes = 1;
if (frame->Format() == gfxASurface::ImageFormatARGB32)
header->biBitCount = 32;
else if (frame->Format() == gfxASurface::ImageFormatRGB24)
header->biBitCount = 24;
header->biCompression = BI_RGB;
header->biSizeImage = imageSize;
const PRUint32 bpr = frame->Stride();
BYTE *dstBits = (BYTE*)data + sizeof(BITMAPINFOHEADER);
BYTE *srcBits = frame->Data();
for (PRInt32 i = 0; i < header->biHeight; ++i) {
PRUint32 srcOffset = imageSize - (bpr * (i + 1));
PRUint32 dstOffset = i * bpr;
::CopyMemory(dstBits + dstOffset, srcBits + srcOffset, bpr);
}
::GlobalUnlock(glob);
*outBitmap = (HANDLE)glob;
return NS_OK;
}
nsImageFromClipboard :: nsImageFromClipboard ()
{
// nothing to do here
}
nsImageFromClipboard :: ~nsImageFromClipboard ( )
{
}
//
// GetEncodedImageStream
//
// Take the raw clipboard image data and convert it to aMIMEFormat in the form of a nsIInputStream
//
nsresult
nsImageFromClipboard ::GetEncodedImageStream (unsigned char * aClipboardData, const char * aMIMEFormat, nsIInputStream** aInputStream )
{
NS_ENSURE_ARG_POINTER (aInputStream);
NS_ENSURE_ARG_POINTER (aMIMEFormat);
nsresult rv;
*aInputStream = nsnull;
// pull the size information out of the BITMAPINFO header and
// initialize the image
BITMAPINFO* header = (BITMAPINFO *) aClipboardData;
PRInt32 width = header->bmiHeader.biWidth;
PRInt32 height = header->bmiHeader.biHeight;
// neg. heights mean the Y axis is inverted and we don't handle that case
NS_ENSURE_TRUE(height > 0, NS_ERROR_FAILURE);
unsigned char * rgbData = new unsigned char[width * height * 3 /* RGB */];
if (rgbData) {
BYTE * pGlobal = (BYTE *) aClipboardData;
// Convert the clipboard image into RGB packed pixel data
rv = ConvertColorBitMap((unsigned char *) (pGlobal + header->bmiHeader.biSize), header, rgbData);
// if that succeeded, encode the bitmap as aMIMEFormat data. Don't return early or we risk leaking rgbData
if (NS_SUCCEEDED(rv)) {
nsCAutoString encoderCID(NS_LITERAL_CSTRING("@mozilla.org/image/encoder;2?type="));
// Map image/jpg to image/jpeg (which is how the encoder is registered).
if (strcmp(aMIMEFormat, kJPEGImageMime) == 0)
encoderCID.Append("image/jpeg");
else
encoderCID.Append(aMIMEFormat);
nsCOMPtr<imgIEncoder> encoder = do_CreateInstance(encoderCID.get(), &rv);
if (NS_SUCCEEDED(rv)){
rv = encoder->InitFromData(rgbData, 0, width, height, 3 * width /* RGB * # pixels in a row */,
imgIEncoder::INPUT_FORMAT_RGB, EmptyString());
if (NS_SUCCEEDED(rv))
encoder->QueryInterface(NS_GET_IID(nsIInputStream), (void **) aInputStream);
}
}
delete [] rgbData;
}
else
rv = NS_ERROR_OUT_OF_MEMORY;
return rv;
} // GetImage
//
// InvertRows
//
// Take the image data from the clipboard and invert the rows. Modifying aInitialBuffer in place.
//
void
nsImageFromClipboard::InvertRows(unsigned char * aInitialBuffer, PRUint32 aSizeOfBuffer, PRUint32 aNumBytesPerRow)
{
if (!aNumBytesPerRow)
return;
PRUint32 numRows = aSizeOfBuffer / aNumBytesPerRow;
unsigned char * row = new unsigned char[aNumBytesPerRow];
PRUint32 currentRow = 0;
PRUint32 lastRow = (numRows - 1) * aNumBytesPerRow;
while (currentRow < lastRow)
{
// store the current row into a temporary buffer
memcpy(row, &aInitialBuffer[currentRow], aNumBytesPerRow);
memcpy(&aInitialBuffer[currentRow], &aInitialBuffer[lastRow], aNumBytesPerRow);
memcpy(&aInitialBuffer[lastRow], row, aNumBytesPerRow);
lastRow -= aNumBytesPerRow;
currentRow += aNumBytesPerRow;
}
delete[] row;
}
//
// ConvertColorBitMap
//
// Takes the clipboard bitmap and converts it into a RGB packed pixel values.
//
nsresult
nsImageFromClipboard::ConvertColorBitMap(unsigned char * aInputBuffer, PBITMAPINFO pBitMapInfo, unsigned char * aOutBuffer)
{
PRUint8 bitCount = pBitMapInfo->bmiHeader.biBitCount;
PRUint32 imageSize = pBitMapInfo->bmiHeader.biSizeImage; // may be zero for BI_RGB bitmaps which means we need to calculate by hand
PRUint32 bytesPerPixel = bitCount / 8;
if (bitCount <= 4)
bytesPerPixel = 1;
// rows are DWORD aligned. Calculate how many real bytes are in each row in the bitmap. This number won't
// correspond to biWidth.
PRUint32 rowSize = (bitCount * pBitMapInfo->bmiHeader.biWidth + 7) / 8; // +7 to round up
if (rowSize % 4)
rowSize += (4 - (rowSize % 4)); // Pad to DWORD Boundary
// if our buffer includes a color map, skip over it
if (bitCount <= 8)
{
PRInt32 bytesToSkip = (pBitMapInfo->bmiHeader.biClrUsed ? pBitMapInfo->bmiHeader.biClrUsed : (1 << bitCount) ) * sizeof(RGBQUAD);
aInputBuffer += bytesToSkip;
}
bitFields colorMasks; // only used if biCompression == BI_BITFIELDS
if (pBitMapInfo->bmiHeader.biCompression == BI_BITFIELDS)
{
// color table consists of 3 DWORDS containing the color masks...
colorMasks.red = (*((PRUint32*)&(pBitMapInfo->bmiColors[0])));
colorMasks.green = (*((PRUint32*)&(pBitMapInfo->bmiColors[1])));
colorMasks.blue = (*((PRUint32*)&(pBitMapInfo->bmiColors[2])));
CalcBitShift(&colorMasks);
aInputBuffer += 3 * sizeof(DWORD);
}
else if (pBitMapInfo->bmiHeader.biCompression == BI_RGB && !imageSize) // BI_RGB can have a size of zero which means we figure it out
{
// XXX: note use rowSize here and not biWidth. rowSize accounts for the DWORD padding for each row
imageSize = rowSize * pBitMapInfo->bmiHeader.biHeight;
}
// The windows clipboard image format inverts the rows
InvertRows(aInputBuffer, imageSize, rowSize);
if (!pBitMapInfo->bmiHeader.biCompression || pBitMapInfo->bmiHeader.biCompression == BI_BITFIELDS)
{
PRUint32 index = 0;
PRUint32 writeIndex = 0;
unsigned char redValue, greenValue, blueValue;
PRUint8 colorTableEntry = 0;
PRInt8 bit; // used for grayscale bitmaps where each bit is a pixel
PRUint32 numPixelsLeftInRow = pBitMapInfo->bmiHeader.biWidth; // how many more pixels do we still need to read for the current row
PRUint32 pos = 0;
while (index < imageSize)
{
switch (bitCount)
{
case 1:
for (bit = 7; bit >= 0 && numPixelsLeftInRow; bit--)
{
colorTableEntry = (aInputBuffer[index] >> bit) & 1;
aOutBuffer[writeIndex++] = pBitMapInfo->bmiColors[colorTableEntry].rgbRed;
aOutBuffer[writeIndex++] = pBitMapInfo->bmiColors[colorTableEntry].rgbGreen;
aOutBuffer[writeIndex++] = pBitMapInfo->bmiColors[colorTableEntry].rgbBlue;
numPixelsLeftInRow--;
}
pos += 1;
break;
case 4:
{
// each aInputBuffer[index] entry contains data for two pixels.
// read the first pixel
colorTableEntry = aInputBuffer[index] >> 4;
aOutBuffer[writeIndex++] = pBitMapInfo->bmiColors[colorTableEntry].rgbRed;
aOutBuffer[writeIndex++] = pBitMapInfo->bmiColors[colorTableEntry].rgbGreen;
aOutBuffer[writeIndex++] = pBitMapInfo->bmiColors[colorTableEntry].rgbBlue;
numPixelsLeftInRow--;
if (numPixelsLeftInRow) // now read the second pixel
{
colorTableEntry = aInputBuffer[index] & 0xF;
aOutBuffer[writeIndex++] = pBitMapInfo->bmiColors[colorTableEntry].rgbRed;
aOutBuffer[writeIndex++] = pBitMapInfo->bmiColors[colorTableEntry].rgbGreen;
aOutBuffer[writeIndex++] = pBitMapInfo->bmiColors[colorTableEntry].rgbBlue;
numPixelsLeftInRow--;
}
pos += 1;
}
break;
case 8:
aOutBuffer[writeIndex++] = pBitMapInfo->bmiColors[aInputBuffer[index]].rgbRed;
aOutBuffer[writeIndex++] = pBitMapInfo->bmiColors[aInputBuffer[index]].rgbGreen;
aOutBuffer[writeIndex++] = pBitMapInfo->bmiColors[aInputBuffer[index]].rgbBlue;
numPixelsLeftInRow--;
pos += 1;
break;
case 16:
{
PRUint16 num = 0;
num = (PRUint8) aInputBuffer[index+1];
num <<= 8;
num |= (PRUint8) aInputBuffer[index];
redValue = ((PRUint32) (((float)(num & 0xf800) / 0xf800) * 0xFF0000) & 0xFF0000)>> 16;
greenValue = ((PRUint32)(((float)(num & 0x07E0) / 0x07E0) * 0x00FF00) & 0x00FF00)>> 8;
blueValue = ((PRUint32)(((float)(num & 0x001F) / 0x001F) * 0x0000FF) & 0x0000FF);
// now we have the right RGB values...
aOutBuffer[writeIndex++] = redValue;
aOutBuffer[writeIndex++] = greenValue;
aOutBuffer[writeIndex++] = blueValue;
numPixelsLeftInRow--;
pos += 2;
}
break;
case 32:
case 24:
if (pBitMapInfo->bmiHeader.biCompression == BI_BITFIELDS)
{
PRUint32 val = *((PRUint32*) (aInputBuffer + index) );
aOutBuffer[writeIndex++] = (val & colorMasks.red) >> colorMasks.redRightShift << colorMasks.redLeftShift;
aOutBuffer[writeIndex++] = (val & colorMasks.green) >> colorMasks.greenRightShift << colorMasks.greenLeftShift;
aOutBuffer[writeIndex++] = (val & colorMasks.blue) >> colorMasks.blueRightShift << colorMasks.blueLeftShift;
numPixelsLeftInRow--;
pos += 4; // we read in 4 bytes of data in order to process this pixel
}
else
{
aOutBuffer[writeIndex++] = aInputBuffer[index+2];
aOutBuffer[writeIndex++] = aInputBuffer[index+1];
aOutBuffer[writeIndex++] = aInputBuffer[index];
numPixelsLeftInRow--;
pos += bytesPerPixel; // 3 bytes for 24 bit data, 4 bytes for 32 bit data (we skip over the 4th byte)...
}
break;
default:
// This is probably the wrong place to check this...
return NS_ERROR_FAILURE;
}
index += bytesPerPixel; // increment our loop counter
if (!numPixelsLeftInRow)
{
if (rowSize != pos)
{
// advance index to skip over remaining padding bytes
index += (rowSize - pos);
}
numPixelsLeftInRow = pBitMapInfo->bmiHeader.biWidth;
pos = 0;
}
} // while we still have bytes to process
}
return NS_OK;
}
void nsImageFromClipboard::CalcBitmask(PRUint32 aMask, PRUint8& aBegin, PRUint8& aLength)
{
// find the rightmost 1
PRUint8 pos;
bool started = false;
aBegin = aLength = 0;
for (pos = 0; pos <= 31; pos++)
{
if (!started && (aMask & (1 << pos)))
{
aBegin = pos;
started = true;
}
else if (started && !(aMask & (1 << pos)))
{
aLength = pos - aBegin;
break;
}
}
}
void nsImageFromClipboard::CalcBitShift(bitFields * aColorMask)
{
PRUint8 begin, length;
// red
CalcBitmask(aColorMask->red, begin, length);
aColorMask->redRightShift = begin;
aColorMask->redLeftShift = 8 - length;
// green
CalcBitmask(aColorMask->green, begin, length);
aColorMask->greenRightShift = begin;
aColorMask->greenLeftShift = 8 - length;
// blue
CalcBitmask(aColorMask->blue, begin, length);
aColorMask->blueRightShift = begin;
aColorMask->blueLeftShift = 8 - length;
}
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку