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Bug 83835 - tweak jpeg decoder performance by not doing a OnDataAvailable()

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for every line of the image.  r=pavlov, sr=blizzard, a=asa


git-svn-id: svn://10.0.0.236/trunk@96359 18797224-902f-48f8-a5cc-f745e15eee43
This commit is contained in:
tor%cs.brown.edu
2001-06-04 23:57:45 +00:00
parent 8e710d9b71
commit 321eec3d52
1 changed files with 8 additions and 9 deletions
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17
mozilla/modules/libpr0n/decoders/jpeg/nsJPEGDecoder.cpp
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@@ -486,12 +486,8 @@ NS_IMETHODIMP nsJPEGDecoder::WriteFrom(nsIInputStream *inStr, PRUint32 count, PR
int
nsJPEGDecoder::OutputScanlines(int num_scanlines)
{
int pass = 0;
if (mState == JPEG_FINAL_PROGRESSIVE_SCAN_OUTPUT)
pass = -1;
else
pass = mCompletedPasses + 1;
PRUint32 top = mInfo.output_scanline;
PRBool rv = PR_TRUE;
while ((mInfo.output_scanline < mInfo.output_height) && num_scanlines--) {
JSAMPROW samples;
@@ -500,7 +496,8 @@ nsJPEGDecoder::OutputScanlines(int num_scanlines)
int ns = jpeg_read_scanlines(&mInfo, mSamples, 1);
if (ns != 1) {
return PR_FALSE; /* suspend */
rv = PR_FALSE; /* suspend */
break;
}
/* If grayscale image ... */
@@ -568,12 +565,14 @@ nsJPEGDecoder::OutputScanlines(int num_scanlines)
samples, // data
bpr, // length
(mInfo.output_scanline-1) * bpr); // offset
}
nsRect r(0, mInfo.output_scanline, mInfo.output_width, 1);
if (top != mInfo.output_scanline) {
nsRect r(0, top, mInfo.output_width, mInfo.output_scanline-top);
mObserver->OnDataAvailable(nsnull, nsnull, mFrame, &r);
}
return PR_TRUE;
return rv;
}