mirror of
https://github.com/rn10950/RetroZilla.git
synced 2024-11-10 01:40:17 +01:00
694 lines
27 KiB
C++
694 lines
27 KiB
C++
/* vim:set tw=80 expandtab softtabstop=4 ts=4 sw=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 the Mozilla BMP Decoder.
|
|
*
|
|
* The Initial Developer of the Original Code is
|
|
* Christian Biesinger <cbiesinger@web.de>.
|
|
* Portions created by the Initial Developer are Copyright (C) 2001
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
* Neil Rashbrook <neil@parkwaycc.co.uk>
|
|
*
|
|
* 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 ***** */
|
|
/* I got the format description from http://www.daubnet.com/formats/BMP.html */
|
|
|
|
/* This is a Cross-Platform BMP Decoder, which should work everywhere, including
|
|
* Big-Endian machines like the PowerPC. */
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include "nsBMPDecoder.h"
|
|
|
|
#include "nsIInputStream.h"
|
|
#include "nsIComponentManager.h"
|
|
#include "imgIContainerObserver.h"
|
|
|
|
#include "imgILoad.h"
|
|
|
|
#include "prlog.h"
|
|
|
|
#ifdef PR_LOGGING
|
|
PRLogModuleInfo *gBMPLog = PR_NewLogModule("BMPDecoder");
|
|
#endif
|
|
|
|
NS_IMPL_ISUPPORTS1(nsBMPDecoder, imgIDecoder)
|
|
|
|
nsBMPDecoder::nsBMPDecoder()
|
|
{
|
|
mColors = nsnull;
|
|
mRow = nsnull;
|
|
mPos = mNumColors = mRowBytes = 0;
|
|
mCurLine = 1; // Otherwise decoder will never start
|
|
mState = eRLEStateInitial;
|
|
mStateData = 0;
|
|
mAlpha = mAlphaPtr = mDecoded = mDecoding = nsnull;
|
|
mLOH = WIN_HEADER_LENGTH;
|
|
}
|
|
|
|
nsBMPDecoder::~nsBMPDecoder()
|
|
{
|
|
delete[] mColors;
|
|
free(mRow);
|
|
if (mAlpha)
|
|
free(mAlpha);
|
|
if (mDecoded)
|
|
free(mDecoded);
|
|
}
|
|
|
|
NS_IMETHODIMP nsBMPDecoder::Init(imgILoad *aLoad)
|
|
{
|
|
PR_LOG(gBMPLog, PR_LOG_DEBUG, ("nsBMPDecoder::Init(%p)\n", aLoad));
|
|
mObserver = do_QueryInterface(aLoad);
|
|
|
|
nsresult rv;
|
|
mImage = do_CreateInstance("@mozilla.org/image/container;1", &rv);
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
|
|
mFrame = do_CreateInstance("@mozilla.org/gfx/image/frame;2", &rv);
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
|
|
return aLoad->SetImage(mImage);
|
|
}
|
|
|
|
NS_IMETHODIMP nsBMPDecoder::Close()
|
|
{
|
|
PR_LOG(gBMPLog, PR_LOG_DEBUG, ("nsBMPDecoder::Close()\n"));
|
|
if (mObserver) {
|
|
mObserver->OnStopContainer(nsnull, mImage);
|
|
mObserver->OnStopDecode(nsnull, NS_OK, nsnull);
|
|
mObserver = nsnull;
|
|
}
|
|
mImage = nsnull;
|
|
mFrame = nsnull;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP nsBMPDecoder::Flush()
|
|
{
|
|
mFrame->SetMutable(PR_FALSE);
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_METHOD nsBMPDecoder::ReadSegCb(nsIInputStream* aIn, void* aClosure,
|
|
const char* aFromRawSegment, PRUint32 aToOffset,
|
|
PRUint32 aCount, PRUint32 *aWriteCount) {
|
|
nsBMPDecoder *decoder = NS_REINTERPRET_CAST(nsBMPDecoder*, aClosure);
|
|
*aWriteCount = aCount;
|
|
return decoder->ProcessData(aFromRawSegment, aCount);
|
|
}
|
|
|
|
NS_IMETHODIMP nsBMPDecoder::WriteFrom(nsIInputStream *aInStr, PRUint32 aCount, PRUint32 *aRetval)
|
|
{
|
|
PR_LOG(gBMPLog, PR_LOG_DEBUG, ("nsBMPDecoder::WriteFrom(%p, %lu, %p)\n", aInStr, aCount, aRetval));
|
|
|
|
return aInStr->ReadSegments(ReadSegCb, this, aCount, aRetval);
|
|
}
|
|
|
|
// ----------------------------------------
|
|
// Actual Data Processing
|
|
// ----------------------------------------
|
|
|
|
nsresult nsBMPDecoder::SetData()
|
|
{
|
|
PRInt32 line = (mBIH.height < 0) ? (-mBIH.height - mCurLine--) : --mCurLine;
|
|
nsresult rv = mFrame->SetImageData(mDecoded, mBpr, line * mBpr);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
nsIntRect r(0, line, mBIH.width, 1);
|
|
return mObserver->OnDataAvailable(nsnull, mFrame, &r);
|
|
}
|
|
|
|
nsresult nsBMPDecoder::WriteRLERows(PRUint32 rows)
|
|
{
|
|
PRUint32 alpha, cnt, line;
|
|
PRUint8 bit;
|
|
PRUint8* pos = mAlpha;
|
|
|
|
// First pack the alpha data
|
|
nsresult rv = mFrame->GetAlphaBytesPerRow(&alpha);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
for (cnt = 0; cnt < alpha; cnt++) {
|
|
PRUint8 byte = 0;
|
|
for (bit = 128; bit; bit >>= 1)
|
|
byte |= *pos++ & bit;
|
|
mAlpha[cnt] = byte;
|
|
}
|
|
|
|
for (cnt = 0; cnt < rows; cnt++) {
|
|
line = (mBIH.height < 0) ? (-mBIH.height - mCurLine--) : --mCurLine;
|
|
rv = mFrame->SetAlphaData(mAlpha, alpha, line * alpha);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
rv = mFrame->SetImageData(mDecoded, mBpr, line * mBpr);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
if (cnt == 0) {
|
|
memset(mAlpha, 0, mBIH.width);
|
|
memset(mDecoded, 0, mBpr);
|
|
}
|
|
}
|
|
|
|
line = (mBIH.height < 0) ? (-mBIH.height - mCurLine - rows) : mCurLine;
|
|
nsIntRect r(0, line, mBIH.width, rows);
|
|
return mObserver->OnDataAvailable(nsnull, mFrame, &r);
|
|
}
|
|
|
|
static void calcBitmask(PRUint32 aMask, PRUint8& aBegin, PRUint8& aLength)
|
|
{
|
|
// find the rightmost 1
|
|
PRUint8 pos;
|
|
PRBool started = PR_FALSE;
|
|
aBegin = aLength = 0;
|
|
for (pos = 0; pos <= 31; pos++) {
|
|
if (!started && (aMask & (1 << pos))) {
|
|
aBegin = pos;
|
|
started = PR_TRUE;
|
|
}
|
|
else if (started && !(aMask & (1 << pos))) {
|
|
aLength = pos - aBegin;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
NS_METHOD nsBMPDecoder::CalcBitShift()
|
|
{
|
|
PRUint8 begin, length;
|
|
// red
|
|
calcBitmask(mBitFields.red, begin, length);
|
|
mBitFields.redRightShift = begin;
|
|
mBitFields.redLeftShift = 8 - length;
|
|
// green
|
|
calcBitmask(mBitFields.green, begin, length);
|
|
mBitFields.greenRightShift = begin;
|
|
mBitFields.greenLeftShift = 8 - length;
|
|
// blue
|
|
calcBitmask(mBitFields.blue, begin, length);
|
|
mBitFields.blueRightShift = begin;
|
|
mBitFields.blueLeftShift = 8 - length;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_METHOD nsBMPDecoder::ProcessData(const char* aBuffer, PRUint32 aCount)
|
|
{
|
|
PR_LOG(gBMPLog, PR_LOG_DEBUG, ("nsBMPDecoder::ProcessData(%p, %lu)", aBuffer, aCount));
|
|
if (!aCount || !mCurLine) // aCount=0 means EOF, mCurLine=0 means we're past end of image
|
|
return NS_OK;
|
|
|
|
nsresult rv;
|
|
if (mPos < BFH_LENGTH) { /* In BITMAPFILEHEADER */
|
|
PRUint32 toCopy = BFH_LENGTH - mPos;
|
|
if (toCopy > aCount)
|
|
toCopy = aCount;
|
|
memcpy(mRawBuf + mPos, aBuffer, toCopy);
|
|
mPos += toCopy;
|
|
aCount -= toCopy;
|
|
aBuffer += toCopy;
|
|
}
|
|
if (mPos == BFH_LENGTH) {
|
|
rv = mObserver->OnStartDecode(nsnull);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
ProcessFileHeader();
|
|
if (mBFH.signature[0] != 'B' || mBFH.signature[1] != 'M')
|
|
return NS_ERROR_FAILURE;
|
|
if (mBFH.bihsize == OS2_BIH_LENGTH)
|
|
mLOH = OS2_HEADER_LENGTH;
|
|
}
|
|
if (mPos >= BFH_LENGTH && mPos < mLOH) { /* In BITMAPINFOHEADER */
|
|
PRUint32 toCopy = mLOH - mPos;
|
|
if (toCopy > aCount)
|
|
toCopy = aCount;
|
|
memcpy(mRawBuf + (mPos - BFH_LENGTH), aBuffer, toCopy);
|
|
mPos += toCopy;
|
|
aCount -= toCopy;
|
|
aBuffer += toCopy;
|
|
}
|
|
if (mPos == mLOH) {
|
|
ProcessInfoHeader();
|
|
PR_LOG(gBMPLog, PR_LOG_DEBUG, ("BMP image is %lix%lix%lu. compression=%lu\n",
|
|
mBIH.width, mBIH.height, mBIH.bpp, mBIH.compression));
|
|
// Verify we support this bit depth
|
|
if (mBIH.bpp != 1 && mBIH.bpp != 4 && mBIH.bpp != 8 &&
|
|
mBIH.bpp != 16 && mBIH.bpp != 24 && mBIH.bpp != 32)
|
|
return NS_ERROR_UNEXPECTED;
|
|
|
|
if (mBIH.bpp <= 8) {
|
|
mNumColors = 1 << mBIH.bpp;
|
|
if (mBIH.colors && mBIH.colors < mNumColors)
|
|
mNumColors = mBIH.colors;
|
|
|
|
// Always allocate 256 even though mNumColors might be smaller
|
|
mColors = new colorTable[256];
|
|
if (!mColors)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
memset(mColors, 0, 256 * sizeof(colorTable));
|
|
}
|
|
else if (mBIH.compression != BI_BITFIELDS && mBIH.bpp == 16) {
|
|
// Use default 5-5-5 format
|
|
mBitFields.red = 0x7C00;
|
|
mBitFields.green = 0x03E0;
|
|
mBitFields.blue = 0x001F;
|
|
CalcBitShift();
|
|
}
|
|
// BMPs with negative width are invalid
|
|
// Reject extremely wide images to keep the math sane
|
|
const PRInt32 k64KWidth = 0x0000FFFF;
|
|
if (mBIH.width < 0 || mBIH.width > k64KWidth)
|
|
return NS_ERROR_FAILURE;
|
|
|
|
PRUint32 real_height = (mBIH.height > 0) ? mBIH.height : -mBIH.height;
|
|
rv = mImage->Init(mBIH.width, real_height, mObserver);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
rv = mObserver->OnStartContainer(nsnull, mImage);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
mCurLine = real_height;
|
|
|
|
mRow = (PRUint8*)malloc((mBIH.width * mBIH.bpp)/8 + 4);
|
|
// +4 because the line is padded to a 4 bit boundary, but I don't want
|
|
// to make exact calculations here, that's unnecessary.
|
|
// Also, it compensates rounding error.
|
|
if (!mRow) {
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
if ((mBIH.compression == BI_RLE8) || (mBIH.compression == BI_RLE4)) {
|
|
rv = mFrame->Init(0, 0, mBIH.width, real_height, RLE_GFXFORMAT_ALPHA, 24);
|
|
} else {
|
|
rv = mFrame->Init(0, 0, mBIH.width, real_height, BMP_GFXFORMAT, 24);
|
|
}
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
rv = mImage->AppendFrame(mFrame);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
mObserver->OnStartFrame(nsnull, mFrame);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
rv = mFrame->GetImageBytesPerRow(&mBpr);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
}
|
|
PRUint8 bpc; // bytes per color
|
|
bpc = (mBFH.bihsize == OS2_BIH_LENGTH) ? 3 : 4; // OS/2 Bitmaps have no padding byte
|
|
if (mColors && (mPos >= mLOH && (mPos < (mLOH + mNumColors * bpc)))) {
|
|
// We will receive (mNumColors * bpc) bytes of color data
|
|
PRUint32 colorBytes = mPos - mLOH; // Number of bytes already received
|
|
PRUint8 colorNum = colorBytes / bpc; // Color which is currently received
|
|
PRUint8 at = colorBytes % bpc;
|
|
while (aCount && (mPos < (mLOH + mNumColors * bpc))) {
|
|
switch (at) {
|
|
case 0:
|
|
mColors[colorNum].blue = *aBuffer;
|
|
break;
|
|
case 1:
|
|
mColors[colorNum].green = *aBuffer;
|
|
break;
|
|
case 2:
|
|
mColors[colorNum].red = *aBuffer;
|
|
colorNum++;
|
|
break;
|
|
case 3:
|
|
// This is a padding byte
|
|
break;
|
|
}
|
|
mPos++; aBuffer++; aCount--;
|
|
at = (at + 1) % bpc;
|
|
}
|
|
}
|
|
else if (aCount && mBIH.compression == BI_BITFIELDS && mPos < (WIN_HEADER_LENGTH + BITFIELD_LENGTH)) {
|
|
// If compression is used, this is a windows bitmap, hence we can
|
|
// use WIN_HEADER_LENGTH instead of mLOH
|
|
PRUint32 toCopy = (WIN_HEADER_LENGTH + BITFIELD_LENGTH) - mPos;
|
|
if (toCopy > aCount)
|
|
toCopy = aCount;
|
|
memcpy(mRawBuf + (mPos - WIN_HEADER_LENGTH), aBuffer, toCopy);
|
|
mPos += toCopy;
|
|
aBuffer += toCopy;
|
|
aCount -= toCopy;
|
|
}
|
|
if (mBIH.compression == BI_BITFIELDS && mPos == WIN_HEADER_LENGTH + BITFIELD_LENGTH) {
|
|
mBitFields.red = LITTLE_TO_NATIVE32(*(PRUint32*)mRawBuf);
|
|
mBitFields.green = LITTLE_TO_NATIVE32(*(PRUint32*)(mRawBuf + 4));
|
|
mBitFields.blue = LITTLE_TO_NATIVE32(*(PRUint32*)(mRawBuf + 8));
|
|
CalcBitShift();
|
|
}
|
|
while (aCount && (mPos < mBFH.dataoffset)) { // Skip whatever is between header and data
|
|
mPos++; aBuffer++; aCount--;
|
|
}
|
|
if (aCount && ++mPos >= mBFH.dataoffset) {
|
|
// Need to increment mPos, else we might get to mPos==mLOH again
|
|
// From now on, mPos is irrelevant
|
|
if (!mBIH.compression || mBIH.compression == BI_BITFIELDS) {
|
|
PRUint32 rowSize = (mBIH.bpp * mBIH.width + 7) / 8; // +7 to round up
|
|
if (rowSize % 4)
|
|
rowSize += (4 - (rowSize % 4)); // Pad to DWORD Boundary
|
|
PRUint32 toCopy;
|
|
do {
|
|
toCopy = rowSize - mRowBytes;
|
|
if (toCopy) {
|
|
if (toCopy > aCount)
|
|
toCopy = aCount;
|
|
memcpy(mRow + mRowBytes, aBuffer, toCopy);
|
|
aCount -= toCopy;
|
|
aBuffer += toCopy;
|
|
mRowBytes += toCopy;
|
|
}
|
|
if ((rowSize - mRowBytes) == 0) {
|
|
if (!mDecoded) {
|
|
mDecoded = (PRUint8*)malloc(mBpr);
|
|
if (!mDecoded)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
PRUint8* p = mRow;
|
|
PRUint8* d = mDecoded;
|
|
PRUint32 lpos = mBIH.width;
|
|
switch (mBIH.bpp) {
|
|
case 1:
|
|
while (lpos > 0) {
|
|
PRInt8 bit;
|
|
PRUint8 idx;
|
|
for (bit = 7; bit >= 0 && lpos > 0; bit--) {
|
|
idx = (*p >> bit) & 1;
|
|
SetPixel(d, idx, mColors);
|
|
--lpos;
|
|
}
|
|
++p;
|
|
}
|
|
break;
|
|
case 4:
|
|
while (lpos > 0) {
|
|
Set4BitPixel(d, *p, lpos, mColors);
|
|
++p;
|
|
}
|
|
break;
|
|
case 8:
|
|
while (lpos > 0) {
|
|
SetPixel(d, *p, mColors);
|
|
--lpos;
|
|
++p;
|
|
}
|
|
break;
|
|
case 16:
|
|
while (lpos > 0) {
|
|
PRUint16 val = LITTLE_TO_NATIVE16(*(PRUint16*)p);
|
|
SetPixel(d,
|
|
(val & mBitFields.red) >> mBitFields.redRightShift << mBitFields.redLeftShift,
|
|
(val & mBitFields.green) >> mBitFields.greenRightShift << mBitFields.greenLeftShift,
|
|
(val & mBitFields.blue) >> mBitFields.blueRightShift << mBitFields.blueLeftShift);
|
|
--lpos;
|
|
p+=2;
|
|
}
|
|
break;
|
|
case 32:
|
|
case 24:
|
|
while (lpos > 0) {
|
|
SetPixel(d, p[2], p[1], p[0]);
|
|
p += 2;
|
|
--lpos;
|
|
if (mBIH.bpp == 32)
|
|
p++; // Padding byte
|
|
++p;
|
|
}
|
|
break;
|
|
default:
|
|
NS_NOTREACHED("Unsupported color depth, but earlier check didn't catch it");
|
|
}
|
|
|
|
nsresult rv = SetData();
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
if (mCurLine == 0) { // Finished last line
|
|
return mObserver->OnStopFrame(nsnull, mFrame);
|
|
}
|
|
mRowBytes = 0;
|
|
|
|
}
|
|
} while (aCount > 0);
|
|
}
|
|
else if ((mBIH.compression == BI_RLE8) || (mBIH.compression == BI_RLE4)) {
|
|
if (((mBIH.compression == BI_RLE8) && (mBIH.bpp != 8))
|
|
|| ((mBIH.compression == BI_RLE4) && (mBIH.bpp != 4) && (mBIH.bpp != 1))) {
|
|
PR_LOG(gBMPLog, PR_LOG_DEBUG, ("BMP RLE8/RLE4 compression only supports 8/4 bits per pixel\n"));
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
if (!mAlpha) {
|
|
PRUint32 alpha;
|
|
rv = mFrame->GetAlphaBytesPerRow(&alpha);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
// Allocate an unpacked buffer
|
|
mAlpha = (PRUint8*)calloc(alpha, 8);
|
|
if (!mAlpha)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
mAlphaPtr = mAlpha;
|
|
}
|
|
|
|
if (!mDecoded) {
|
|
mDecoded = (PRUint8*)calloc(mBpr, 1);
|
|
if (!mDecoded)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
mDecoding = mDecoded;
|
|
}
|
|
|
|
while (aCount > 0) {
|
|
PRUint8 byte;
|
|
|
|
switch(mState) {
|
|
case eRLEStateInitial:
|
|
mStateData = (PRUint8)*aBuffer++;
|
|
aCount--;
|
|
|
|
mState = eRLEStateNeedSecondEscapeByte;
|
|
continue;
|
|
|
|
case eRLEStateNeedSecondEscapeByte:
|
|
byte = *aBuffer++;
|
|
aCount--;
|
|
if (mStateData != RLE_ESCAPE) { // encoded mode
|
|
// Encoded mode consists of two bytes:
|
|
// the first byte (mStateData) specifies the
|
|
// number of consecutive pixels to be drawn
|
|
// using the color index contained in
|
|
// the second byte
|
|
// Work around bitmaps that specify too many pixels
|
|
if (mAlphaPtr + mStateData > mAlpha + mBIH.width)
|
|
mStateData = (PRUint32)(mAlpha + mBIH.width - mAlphaPtr);
|
|
memset(mAlphaPtr, 0xFF, mStateData);
|
|
mAlphaPtr += mStateData;
|
|
if (mBIH.compression == BI_RLE8) {
|
|
while (mStateData > 0) {
|
|
SetPixel(mDecoding, byte, mColors);
|
|
mStateData--;
|
|
}
|
|
} else {
|
|
while (mStateData > 0) {
|
|
Set4BitPixel(mDecoding, byte, mStateData, mColors);
|
|
}
|
|
}
|
|
|
|
mState = eRLEStateInitial;
|
|
continue;
|
|
}
|
|
|
|
switch(byte) {
|
|
case RLE_ESCAPE_EOL:
|
|
// End of Line: Write out current row
|
|
// and reset our row buffer
|
|
rv = WriteRLERows(1);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
mAlphaPtr = mAlpha;
|
|
mDecoding = mDecoded;
|
|
|
|
mState = eRLEStateInitial;
|
|
break;
|
|
|
|
case RLE_ESCAPE_EOF: // EndOfFile
|
|
rv = WriteRLERows(mCurLine);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
break;
|
|
|
|
case RLE_ESCAPE_DELTA:
|
|
mState = eRLEStateNeedXDelta;
|
|
continue;
|
|
|
|
default : // absolute mode
|
|
// Save the number of pixels to read
|
|
mStateData = byte;
|
|
if (mAlphaPtr + mStateData > mAlpha + mBIH.width) {
|
|
// We can work around bitmaps that specify one
|
|
// pixel too many, but only if their width is odd.
|
|
mStateData -= mBIH.width & 1;
|
|
if (mAlphaPtr + mStateData > mAlpha + mBIH.width)
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
memset(mAlphaPtr, 0xFF, mStateData);
|
|
mAlphaPtr += mStateData;
|
|
|
|
// See if we will need to skip a byte
|
|
// to word align the pixel data
|
|
// mStateData is a number of pixels
|
|
// so allow for the RLE compression type
|
|
// Pixels RLE8=1 RLE4=2
|
|
// 1 Pad Pad
|
|
// 2 No Pad
|
|
// 3 Pad No
|
|
// 4 No No
|
|
if (((mStateData - 1) & mBIH.compression) != 0)
|
|
mState = eRLEStateAbsoluteMode;
|
|
else
|
|
mState = eRLEStateAbsoluteModePadded;
|
|
continue;
|
|
}
|
|
break;
|
|
|
|
case eRLEStateNeedXDelta:
|
|
// Handle the XDelta and proceed to get Y Delta
|
|
byte = *aBuffer++;
|
|
aCount--;
|
|
mAlphaPtr += byte;
|
|
if (mAlphaPtr > mAlpha + mBIH.width)
|
|
mAlphaPtr = mAlpha + mBIH.width;
|
|
mDecoding += byte * GFXBYTESPERPIXEL;
|
|
|
|
mState = eRLEStateNeedYDelta;
|
|
continue;
|
|
|
|
case eRLEStateNeedYDelta:
|
|
// Get the Y Delta and then "handle" the move
|
|
byte = *aBuffer++;
|
|
aCount--;
|
|
mState = eRLEStateInitial;
|
|
if (byte == 0)
|
|
continue; // Nothing more to do
|
|
|
|
rv = WriteRLERows(PR_MIN(byte, mCurLine));
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
break;
|
|
|
|
case eRLEStateAbsoluteMode: // Absolute Mode
|
|
case eRLEStateAbsoluteModePadded:
|
|
// In absolute mode, the second byte (mStateData)
|
|
// represents the number of pixels
|
|
// that follow, each of which contains
|
|
// the color index of a single pixel.
|
|
if (mBIH.compression == BI_RLE8) {
|
|
while (aCount > 0 && mStateData > 0) {
|
|
byte = *aBuffer++;
|
|
aCount--;
|
|
SetPixel(mDecoding, byte, mColors);
|
|
mStateData--;
|
|
}
|
|
} else {
|
|
while (aCount > 0 && mStateData > 0) {
|
|
byte = *aBuffer++;
|
|
aCount--;
|
|
Set4BitPixel(mDecoding, byte, mStateData, mColors);
|
|
}
|
|
}
|
|
|
|
if (mStateData == 0) {
|
|
// In absolute mode, each run must
|
|
// be aligned on a word boundary
|
|
|
|
if (mState == eRLEStateAbsoluteMode) { // Word Aligned
|
|
mState = eRLEStateInitial;
|
|
} else if (aCount > 0) { // Not word Aligned
|
|
// "next" byte is just a padding byte
|
|
// so "move" past it and we can continue
|
|
aBuffer++;
|
|
aCount--;
|
|
mState = eRLEStateInitial;
|
|
}
|
|
}
|
|
// else state is still eRLEStateAbsoluteMode
|
|
continue;
|
|
|
|
default :
|
|
NS_NOTREACHED("BMP RLE decompression: unknown state!");
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
// Because of the use of the continue statement
|
|
// we only get here for eol, eof or y delta
|
|
if (mCurLine == 0) { // Finished last line
|
|
return mObserver->OnStopFrame(nsnull, mFrame);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
void nsBMPDecoder::ProcessFileHeader()
|
|
{
|
|
memset(&mBFH, 0, sizeof(mBFH));
|
|
memcpy(&mBFH.signature, mRawBuf, sizeof(mBFH.signature));
|
|
memcpy(&mBFH.filesize, mRawBuf + 2, sizeof(mBFH.filesize));
|
|
memcpy(&mBFH.reserved, mRawBuf + 6, sizeof(mBFH.reserved));
|
|
memcpy(&mBFH.dataoffset, mRawBuf + 10, sizeof(mBFH.dataoffset));
|
|
memcpy(&mBFH.bihsize, mRawBuf + 14, sizeof(mBFH.bihsize));
|
|
|
|
// Now correct the endianness of the header
|
|
mBFH.filesize = LITTLE_TO_NATIVE32(mBFH.filesize);
|
|
mBFH.dataoffset = LITTLE_TO_NATIVE32(mBFH.dataoffset);
|
|
mBFH.bihsize = LITTLE_TO_NATIVE32(mBFH.bihsize);
|
|
}
|
|
|
|
void nsBMPDecoder::ProcessInfoHeader()
|
|
{
|
|
memset(&mBIH, 0, sizeof(mBIH));
|
|
if (mBFH.bihsize == 12) { // OS/2 Bitmap
|
|
memcpy(&mBIH.width, mRawBuf, 2);
|
|
memcpy(&mBIH.height, mRawBuf + 2, 2);
|
|
memcpy(&mBIH.planes, mRawBuf + 4, sizeof(mBIH.planes));
|
|
memcpy(&mBIH.bpp, mRawBuf + 6, sizeof(mBIH.bpp));
|
|
}
|
|
else {
|
|
memcpy(&mBIH.width, mRawBuf, sizeof(mBIH.width));
|
|
memcpy(&mBIH.height, mRawBuf + 4, sizeof(mBIH.height));
|
|
memcpy(&mBIH.planes, mRawBuf + 8, sizeof(mBIH.planes));
|
|
memcpy(&mBIH.bpp, mRawBuf + 10, sizeof(mBIH.bpp));
|
|
memcpy(&mBIH.compression, mRawBuf + 12, sizeof(mBIH.compression));
|
|
memcpy(&mBIH.image_size, mRawBuf + 16, sizeof(mBIH.image_size));
|
|
memcpy(&mBIH.xppm, mRawBuf + 20, sizeof(mBIH.xppm));
|
|
memcpy(&mBIH.yppm, mRawBuf + 24, sizeof(mBIH.yppm));
|
|
memcpy(&mBIH.colors, mRawBuf + 28, sizeof(mBIH.colors));
|
|
memcpy(&mBIH.important_colors, mRawBuf + 32, sizeof(mBIH.important_colors));
|
|
}
|
|
|
|
// Convert endianness
|
|
mBIH.width = LITTLE_TO_NATIVE32(mBIH.width);
|
|
mBIH.height = LITTLE_TO_NATIVE32(mBIH.height);
|
|
mBIH.planes = LITTLE_TO_NATIVE16(mBIH.planes);
|
|
mBIH.bpp = LITTLE_TO_NATIVE16(mBIH.bpp);
|
|
|
|
mBIH.compression = LITTLE_TO_NATIVE32(mBIH.compression);
|
|
mBIH.image_size = LITTLE_TO_NATIVE32(mBIH.image_size);
|
|
mBIH.xppm = LITTLE_TO_NATIVE32(mBIH.xppm);
|
|
mBIH.yppm = LITTLE_TO_NATIVE32(mBIH.yppm);
|
|
mBIH.colors = LITTLE_TO_NATIVE32(mBIH.colors);
|
|
mBIH.important_colors = LITTLE_TO_NATIVE32(mBIH.important_colors);
|
|
}
|