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[0.4.7][WIN32SS] Fix RLE4 bitmap decoding (#1188) CORE-10553

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fix picked from 0.4.12-dev-189-g 968c8f37f1

It fixes:
CORE-10553 'WinRar SFX have corrupted image'
CORE-11399 'Microsoft paint (from XPSP3) does not show bitmaps on the tools'

Please note, that MS mspaint.exe does not start in all older rls-branches yet for unrelated reasons,
it did start and render properly in releases/0.4.11, but does not start in releases/0.4.7 yet.
Still I marked the ticket CORE-11399 as resolved in all of them as that has nothing to do with the RLE stuff.
The WinRAR SFX worked properly in all of them.
This commit is contained in:
Joachim Henze 2022-10-26 11:47:18 +02:00
parent a3c65f6cd4
commit 6a740aef87
1 changed files with 51 additions and 22 deletions
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73
win32ss/gdi/eng/rlecomp.c
View file

@ -18,40 +18,52 @@ enum Rle_EscapeCodes
RLE_DELTA = 2 /* Delta */
};
VOID DecompressBitmap(SIZEL Size, BYTE *CompressedBits, BYTE *UncompressedBits, LONG Delta, ULONG Format, ULONG cjSizeImage)
VOID DecompressBitmap(SIZEL Size, BYTE *CompressedBits, BYTE *UncompressedBits,
LONG Delta, ULONG Format, ULONG cjSizeImage)
{
INT x = 0;
INT y = Size.cy - 1;
INT c;
INT length;
INT width;
INT height = y;
INT x = 0, y = Size.cy - 1;
INT i, c, c2, length;
INT width = Size.cx, height = y;
BYTE *begin = CompressedBits;
BYTE *bits = CompressedBits;
BYTE *temp;
INT shift = 0;
BOOL is4bpp = FALSE;
if ((Format == BMF_4RLE) || (Format == BMF_4BPP))
shift = 1;
is4bpp = TRUE;
else if ((Format != BMF_8RLE) && (Format != BMF_8BPP))
return;
width = ((Size.cx + shift) >> shift);
_SEH2_TRY
{
while (y >= 0 && (bits - begin) <= cjSizeImage)
{
length = (*bits++) >> shift;
length = *bits++;
if (length)
{
c = *bits++;
while (length--)
for (i = 0; i < length; i++)
{
if (x >= width) break;
temp = UncompressedBits + (((height - y) * Delta) + x);
temp = UncompressedBits + (height - y) * Delta;
if (is4bpp)
{
temp += x / 2;
if (i & 1)
c2 = c & 0x0F;
else
c2 = c >> 4;
if (x & 1)
*temp |= c2;
else
*temp |= c2 << 4;
}
else
{
temp += x;
*temp = c;
}
x++;
*temp = c;
}
}
else
@ -66,19 +78,36 @@ VOID DecompressBitmap(SIZEL Size, BYTE *CompressedBits, BYTE *UncompressedBits,
case RLE_END:
_SEH2_YIELD(return);
case RLE_DELTA:
x += (*bits++) >> shift;
y -= (*bits++) >> shift;
x += *bits++;
y -= *bits++;
break;
default:
length = length >> shift;
while (length--)
for (i = 0; i < length; i++)
{
c = *bits++;
if (!(is4bpp && i & 1))
c = *bits++;
if (x < width)
{
temp = UncompressedBits + (((height - y) * Delta) + x);
temp = UncompressedBits + (height - y) * Delta;
if (is4bpp)
{
temp += x / 2;
if (i & 1)
c2 = c & 0x0F;
else
c2 = c >> 4;
if (x & 1)
*temp |= c2;
else
*temp |= c2 << 4;
}
else
{
temp += x;
*temp = c;
}
x++;
*temp = c;
}
}
if ((bits - begin) & 1)