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Add de-interleaving for GIF images.

This commit is contained in:
Alex Villacís Lasso 2004-09-16 19:07:42 +00:00 committed by Alexandre Julliard
parent 6a4d392670
commit 6df12bb338
1 changed files with 26 additions and 4 deletions
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30
dlls/oleaut32/olepicture.c
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@ -1083,10 +1083,32 @@ static HRESULT WINAPI OLEPictureImpl_Load(IPersistStream* iface,IStream*pStm) {
}
}
/* Map to in picture coordinates */
for (i=0;i<gid->Height;i++)
for (j=0;j<gid->Width;j++)
bytes[(gid->Top+i)*(padding)+gid->Left+j]=si->RasterBits[i*gid->Width+j];
/* Map to in picture coordinates */
for (i = 0, j = 0; i < gid->Height; i++) {
if (gif->Image.Interlace) {
memcpy(
bytes + (gid->Top + j) * padding + gid->Left,
si->RasterBits + i * gid->Width,
gid->Width);
/* Lower bits of interlaced counter encode current interlace */
if (j & 1) j += 2; /* Currently filling odd rows */
else if (j & 2) j += 4; /* Currently filling even rows not multiples of 4 */
else j += 8; /* Currently filling every 8th row or 4th row in-between */
if (j >= gid->Height && i < gid->Height && (j & 1) == 0) {
/* End of current interlace, go to next interlace */
if (j & 2) j = 1; /* Next iteration fills odd rows */
else if (j & 4) j = 2; /* Next iteration fills even rows not mod 4 and not mod 8 */
else j = 4; /* Next iteration fills rows in-between rows mod 6 */
}
} else {
memcpy(
bytes + (gid->Top + i) * padding + gid->Left,
si->RasterBits + i * gid->Width,
gid->Width);
}
}
bmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmi->bmiHeader.biWidth = gif->SWidth;