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Commit c8f3fed5 authored by Alexandre Julliard's avatar Alexandre Julliard
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Ignore RLE data that goes past the line end (found by Uwe Bonnes).

General cleanup of the RLE routines.
parent 76598823
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Showing with 106 additions and 198 deletions
graphics/x11drv/dib.c
View file @ c8f3fed5
......@@ -67,6 +67,13 @@ typedef struct
} X11DRV_DIB_IMAGEBITS_DESCR;
enum Rle_EscapeCodes
{
RLE_EOL = 0, /* End of line */
RLE_END = 1, /* End of bitmap */
RLE_DELTA = 2 /* Delta */
};
/***********************************************************************
* X11DRV_DIB_GetXImageWidthBytes
*
......@@ -855,70 +862,44 @@ static void X11DRV_DIB_SetImageBits_RLE4( int lines, const BYTE *bits,
int left, int *colors,
XImage *bmpImage )
{
int x = 0, c, length;
int x = 0, y = lines - 1, c, length;
const BYTE *begin = bits;
lines--;
while ((int)lines >= 0) {
while (y >= 0)
{
length = *bits++;
if (length) { /* encoded */
c = *bits++;
while (length--) {
if(x >= width) {
x = 0;
if(--lines < 0)
return;
}
XPutPixel(bmpImage, x++, lines, colors[c >>4]);
if (length) {
length--;
if(x >= width) {
x = 0;
if(--lines < 0)
return;
}
XPutPixel(bmpImage, x++, lines, colors[c & 0xf]);
}
if (x >= width) break;
XPutPixel(bmpImage, x++, y, colors[c >> 4]);
if (!length--) break;
if (x >= width) break;
XPutPixel(bmpImage, x++, y, colors[c & 0xf]);
}
} else {
length = *bits++;
switch (length) {
case 0: /* eol */
x = 0;
lines--;
continue;
switch (length)
{
case RLE_EOL:
x = 0;
y--;
break;
case 1: /* eopicture */
case RLE_END:
return;
case 2: /* delta */
x += *bits++;
if(x >= width) {
FIXME_(x11drv)("x-delta is too large?\n");
return;
}
lines -= *bits++;
continue;
case RLE_DELTA:
x += *bits++;
y -= *bits++;
break;
default: /* absolute */
while (length--) {
c = *bits++;
if(x >= width) {
x = 0;
if(--lines < 0)
return;
}
XPutPixel(bmpImage, x++, lines, colors[c >> 4]);
if (length) {
length--;
if(x >= width) {
x = 0;
if(--lines < 0)
return;
}
XPutPixel(bmpImage, x++, lines, colors[c & 0xf]);
}
if (x < width) XPutPixel(bmpImage, x++, y, colors[c >> 4]);
if (!length--) break;
if (x < width) XPutPixel(bmpImage, x++, y, colors[c & 0xf]);
}
if ((bits - begin) & 1)
bits++;
......@@ -1272,172 +1253,99 @@ static void X11DRV_DIB_GetImageBits_8( int lines, BYTE *dstbits,
* James A. Youngman <mbcstjy@afs.man.ac.uk>
* [JAY]
*/
enum Rle8_EscapeCodes
{
/*
* Apologies for polluting your file's namespace...
*/
RleEol = 0, /* End of line */
RleEnd = 1, /* End of bitmap */
RleDelta = 2 /* Delta */
};
static void X11DRV_DIB_SetImageBits_RLE8( int lines, const BYTE *bits,
DWORD width, DWORD dstwidth,
int left, int *colors,
XImage *bmpImage )
{
int x; /* X-positon on each line. Increases. */
int line; /* Line #. Starts at lines-1, decreases */
int y; /* Line #. Starts at lines-1, decreases */
const BYTE *pIn = bits; /* Pointer to current position in bits */
BYTE length; /* The length pf a run */
BYTE color_index; /* index into colors[] as read from bits */
BYTE escape_code; /* See enum Rle8_EscapeCodes.*/
int color; /* value of colour[color_index] */
if (lines == 0) /* Let's hope this doesn't happen. */
return;
/*
* Note that the bitmap data is stored by Windows starting at the
* bottom line of the bitmap and going upwards. Within each line,
* the data is stored left-to-right. That's the reason why line
* goes from lines-1 to 0. [JAY]
*/
x = 0;
line = lines-1;
do
{
length = *pIn++;
/*
* If the length byte is not zero (which is the escape value),
* We have a run of length pixels all the same colour. The colour
* index is stored next.
*
* If the length byte is zero, we need to read the next byte to
* know what to do. [JAY]
*/
if (length != 0)
{
/*
* [Run-Length] Encoded mode
*/
color_index = (*pIn++); /* Get the colour index. */
color = colors[color_index];
while(length--)
{
if (x>=dstwidth)
{
x=0;
line--;
}
XPutPixel(bmpImage, x++, line, color);
}
}
else
{
/*
* Escape codes (may be an absolute sequence though)
*/
escape_code = (*pIn++);
switch(escape_code)
{
case RleEol: /* =0, end of line */
{
x = 0;
line--;
break;
}
case RleEnd: /* =1, end of bitmap */
{
/*
* Not all RLE8 bitmaps end with this
* code. For example, Paint Shop Pro
* produces some that don't. That's (I think)
* what caused the previous implementation to
* fail. [JAY]
*/
line=-1; /* Cause exit from do loop. */
break;
}
case RleDelta: /* =2, a delta */
{
/*
* Note that deltaing to line 0
* will cause an exit from the loop,
* which may not be what is intended.
* The fact that there is a delta in the bits
* almost certainly implies that there is data
* to follow. You may feel that we should
* jump to the top of the loop to avoid exiting
* in this case.
*
* TODO: Decide what to do here in that case. [JAY]
*/
x += (*pIn++);
line -= (*pIn++);
if (line == 0)
{
TRACE("Delta to last line of bitmap "
"(wrongly?) causes loop exit\n");
}
break;
}
default: /* >2, switch to absolute mode */
{
/*
* Absolute Mode
*/
length = escape_code;
while(length--)
{
color_index = (*pIn++);
if (x>=dstwidth)
{
x=0;
line--;
}
XPutPixel(bmpImage, x++, line,
colors[color_index]);
}
/*
* If you think for a moment you'll realise that the
* only time we could ever possibly read an odd
* number of bytes is when there is a 0x00 (escape),
* a value >0x02 (absolute mode) and then an odd-
* length run. Therefore this is the only place we
* need to worry about it. Everywhere else the
* bytes are always read in pairs. [JAY]
*/
if (escape_code & 1)
pIn++; /* Throw away the pad byte. */
break;
}
} /* switch (escape_code) : Escape sequence */
} /* process either an encoded sequence or an escape sequence */
/* We expect to come here more than once per line. */
} while (line >= 0); /* Do this until the bitmap is filled */
/*
* Everybody comes here at the end.
* Check how we exited the loop and print a message if it's a bit odd.
* [JAY]
*/
if ( (*(pIn-2) != 0/*escape*/) || (*(pIn-1)!= RleEnd) )
{
TRACE("End-of-bitmap without (strictly) proper escape code. Last two "
"bytes were: %02X %02X.\n", (int)*(pIn-2),(int)*(pIn-1));
}
}
y = lines - 1;
while (y >= 0)
{
length = *pIn++;
/*
* If the length byte is not zero (which is the escape value),
* We have a run of length pixels all the same colour. The colour
* index is stored next.
*
* If the length byte is zero, we need to read the next byte to
* know what to do. [JAY]
*/
if (length != 0)
{
/*
* [Run-Length] Encoded mode
*/
int color = colors[*pIn++];
while (length-- && x < dstwidth) XPutPixel(bmpImage, x++, y, color);
}
else
{
/*
* Escape codes (may be an absolute sequence though)
*/
escape_code = (*pIn++);
switch(escape_code)
{
case RLE_EOL:
x = 0;
y--;
break;
case RLE_END:
/* Not all RLE8 bitmaps end with this code. For
* example, Paint Shop Pro produces some that don't.
* That's (I think) what caused the previous
* implementation to fail. [JAY]
*/
return;
case RLE_DELTA:
x += (*pIn++);
y -= (*pIn++);
break;
default: /* switch to absolute mode */
length = escape_code;
while (length--)
{
int color = colors[*pIn++];
if (x >= dstwidth)
{
pIn += length;
break;
}
XPutPixel(bmpImage, x++, y, color);
}
/*
* If you think for a moment you'll realise that the
* only time we could ever possibly read an odd
* number of bytes is when there is a 0x00 (escape),
* a value >0x02 (absolute mode) and then an odd-
* length run. Therefore this is the only place we
* need to worry about it. Everywhere else the
* bytes are always read in pairs. [JAY]
*/
if (escape_code & 1) pIn++; /* Throw away the pad byte. */
break;
} /* switch (escape_code) : Escape sequence */
}
}
}
/***********************************************************************
......
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