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Patch from Helmethead <hoshem@mel.comcen.com.au> to fix up bmp decoder to:

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Mon May 28 14:21:35 2001  Jonathan Blandford  <jrb@redhat.com>

	* io-bmp.c: Patch from Helmethead <hoshem@mel.comcen.com.au> to
	fix up bmp decoder to:
	 - adds 16 bpp bmp support (bug #53884)
	 - adds OS/2 1.x format bmp support (bug #54964)
	 - adds 4 bpp RLE compressed bmp support
	 - adds 1 bpp colormap support
	 - fixes negative height (top down) bmp support.
This commit is contained in:
Jonathan Blandford 2001-05-28 18:28:16 +00:00 committed by Jonathan Blandford
parent 57237d4d89
commit a076a9eb3a
2 changed files with 313 additions and 259 deletions
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10
gdk-pixbuf/ChangeLog
View File

@ -1,3 +1,13 @@
Mon May 28 14:21:35 2001 Jonathan Blandford <jrb@redhat.com>
* io-bmp.c: Patch from Helmethead <hoshem@mel.comcen.com.au> to
fix up bmp decoder to:
- adds 16 bpp bmp support (bug #53884)
- adds OS/2 1.x format bmp support (bug #54964)
- adds 4 bpp RLE compressed bmp support
- adds 1 bpp colormap support
- fixes negative height (top down) bmp support
2001-05-25 Hans Breuer <hans@breuer.org>
* gdk_pixbuf.def : reflect Havoc's recent api change

548
gdk-pixbuf/io-bmp.c
View File

@ -23,14 +23,6 @@
* Boston, MA 02111-1307, USA.
*/
/*
Known bugs:
* 4bpp compressed files don't work
* bi-tonal files aren't tested with palettes
*/
#include <config.h>
#include <stdio.h>
#ifdef HAVE_UNISTD_H
@ -72,6 +64,15 @@ struct BitmapInfoHeader {
guint biClrImportant;
};
/* biCompression values */
#define BI_RGB 0
#define BI_RLE8 1
#define BI_RLE4 2
#define BI_BITFIELDS 3
#define BI_JPEG 4
#define BI_PNG 5
/*
DumpBIH printf's the values in a BitmapInfoHeader to the screen, for
@ -116,8 +117,9 @@ static void DumpBIH(unsigned char *BIH)
the current bitmap */
struct headerpair {
guint width;
guint height;
guint32 size;
gint32 width;
gint32 height;
guint depth;
guint Negative; /* Negative = 1 -> top down BMP,
Negative = 0 -> bottom up BMP */
@ -125,17 +127,12 @@ struct headerpair {
/* Data needed for the "state" during decompression */
struct bmp_compression_state {
gint phase; /* 0 = clean,
1 = count received
2 = escape received
3 = in "raw" run
4 = Relative part 1 is next
5 = Relative part 2 is next
6 = end of image -> No more input allowed
*/
gint phase;
gint RunCount;
gint XDelta;
gint YDelta;
guchar *linebuff;
gint linebuffsize; /* these two counts in nibbles */
gint linebuffdone;
};
/* Progressive loading */
@ -145,18 +142,19 @@ struct bmp_progressive_state {
ModuleUpdatedNotifyFunc updated_func;
gpointer user_data;
gint HeaderSize; /* The size of the header-part (incl colormap) */
guchar *HeaderBuf; /* The buffer for the header (incl colormap) */
gint HeaderDone; /* The nr of bytes actually in HeaderBuf */
guint LineWidth;
guint Lines; /* # of finished lines */
gint LineWidth; /* The width of a line in bytes */
guchar *LineBuf; /* Buffer for 1 line */
gint LineDone; /* # of bytes in LineBuf */
gint Lines; /* # of finished lines */
guchar *buff;
gint BufferSize;
gint BufferDone;
guchar (*Colormap)[3];
gint Type; /*
32 = RGB + alpha
24 = RGB
16 = RGB
4 = 4 bpp colormapped
8 = 8 bpp colormapped
1 = 1 bit bitonal
@ -227,34 +225,38 @@ static gboolean DecodeHeader(unsigned char *BFH, unsigned char *BIH,
struct bmp_progressive_state *State,
GError **error)
{
gboolean retval = TRUE;
/* FIXME this is totally unrobust against bogus image data. */
if (State->BufferSize < GUINT32_FROM_LE (* (guint32 *) &BIH[0]) + 14) {
State->BufferSize = GUINT32_FROM_LE (* (guint32 *) &BIH[0]) + 14;
State->buff = g_realloc (State->buff, State->BufferSize);
return TRUE;
}
#if DUMPBIH
DumpBIH(BIH);
#endif
State->Header.width =
(int) (BIH[7] << 24) + (BIH[6] << 16) + (BIH[5] << 8) +
(BIH[4]);
State->Header.height =
(int) (BIH[11] << 24) + (BIH[10] << 16) + (BIH[9] << 8) +
(BIH[8]);
State->Header.depth = (int) (BIH[15] << 8) + (BIH[14]);;
State->Header.size = GUINT32_FROM_LE (* (guint32 *) &BIH[0]);
if (State->Header.size == 40) {
State->Header.width = GINT32_FROM_LE (* (gint32 *) &BIH[4]);
State->Header.height = GINT32_FROM_LE (* (gint32 *) &BIH[8]);
State->Header.depth = GUINT16_FROM_LE (* (guint16 *) &BIH[14]);
State->Compressed = GUINT32_FROM_LE (* (guint32 *) &BIH[16]);
} else if (State->Header.size == 12) {
State->Header.width = GUINT16_FROM_LE (* (guint16 *) &BIH[4]);
State->Header.height = GUINT16_FROM_LE (* (guint16 *) &BIH[6]);
State->Header.depth = GUINT16_FROM_LE (* (guint16 *) &BIH[10]);
State->Compressed = 0;
} else {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
_("BMP image has unsupported header size"));
return FALSE;
}
State->Type = State->Header.depth; /* This may be less trivial someday */
State->HeaderSize =
(int) ((BFH[13] << 24) + (BFH[12] << 16) + (BFH[11] << 8) +
(BFH[10]));
if (State->HeaderSize >= 14 + 40 + 1024)
State->HeaderBuf =
g_realloc(State->HeaderBuf, State->HeaderSize);
if ((BIH[16] != 0) || (BIH[17] != 0) || (BIH[18] != 0)
|| (BIH[19] != 0)) {
State->Compressed = 1;
}
/* Negative heights indicates bottom-down pixelorder */
if (State->Header.height < 0) {
@ -266,28 +268,44 @@ static gboolean DecodeHeader(unsigned char *BFH, unsigned char *BIH,
State->Header.Negative = 0;
}
if (State->Header.width == 0 || State->Header.height == 0 ||
(State->Compressed == BI_RLE4 && State->Type != 4) ||
(State->Compressed == BI_RLE8 && State->Type != 8) ||
State->Compressed > BI_RLE4) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
_("BMP image has bogus header data"));
return FALSE;
}
if (State->Type == 32)
State->LineWidth = State->Header.width * 4;
if (State->Type == 24)
else if (State->Type == 24)
State->LineWidth = State->Header.width * 3;
if (State->Type == 8)
else if (State->Type == 16)
State->LineWidth = State->Header.width * 2;
else if (State->Type == 8)
State->LineWidth = State->Header.width * 1;
if (State->Type == 4)
else if (State->Type == 4)
State->LineWidth = (State->Header.width + 1) / 2;
if (State->Type == 1) {
else if (State->Type == 1) {
State->LineWidth = State->Header.width / 8;
if ((State->Header.width & 7) != 0)
State->LineWidth++;
} else {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
_("BMP image has bogus header data"));
return FALSE;
}
/* Pad to a 32 bit boundary */
if (((State->LineWidth % 4) > 0) && (State->Compressed == 0))
if (((State->LineWidth % 4) > 0) && (State->Compressed == BI_RGB))
State->LineWidth = (State->LineWidth / 4) * 4 + 4;
if (State->LineBuf == NULL)
State->LineBuf = g_malloc(State->LineWidth);
if (State->pixbuf == NULL) {
if (State->Type == 32)
State->pixbuf =
@ -305,7 +323,7 @@ static gboolean DecodeHeader(unsigned char *BFH, unsigned char *BIH,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
_("Not enough memory to load bitmap image"));
retval = FALSE;
return FALSE;
}
if (State->prepared_func != NULL)
@ -314,7 +332,47 @@ static gboolean DecodeHeader(unsigned char *BFH, unsigned char *BIH,
}
return retval;
if (State->Compressed != BI_RGB) {
State->compr.linebuffdone = 0;
State->compr.linebuffsize = State->Header.width;
if (State->Type == 8)
State->compr.linebuffsize *= 2;
State->compr.linebuff = g_malloc ((State->compr.linebuffsize + 1) / 2);
}
State->BufferDone = 0;
if (State->Type <= 8)
State->BufferSize = GUINT32_FROM_LE (* (guint32 *) &BFH[10]) - 14 - State->Header.size;
else if (State->Compressed != BI_RGB)
State->BufferSize = 2;
else
State->BufferSize = State->LineWidth;
State->buff = g_realloc (State->buff, State->BufferSize);
return TRUE;
}
static void DecodeColormap (guchar *buff,
struct bmp_progressive_state *State,
GError **error)
{
gint i;
State->Colormap = g_malloc ((1 << State->Header.depth) * sizeof (*State->Colormap));
for (i = 0; i < (1 << State->Header.depth); i++)
{
State->Colormap[i][0] = buff[i * (State->Header.size == 12 ? 3 : 4)];
State->Colormap[i][1] = buff[i * (State->Header.size == 12 ? 3 : 4) + 1];
State->Colormap[i][2] = buff[i * (State->Header.size == 12 ? 3 : 4) + 2];
}
State->BufferDone = 0;
if (State->Compressed != BI_RGB)
State->BufferSize = 2;
else
State->BufferSize = State->LineWidth;
State->buff = g_realloc (State->buff, State->BufferSize);
}
/*
@ -336,16 +394,13 @@ gdk_pixbuf__bmp_image_begin_load(ModulePreparedNotifyFunc prepared_func,
context->updated_func = updated_func;
context->user_data = user_data;
context->HeaderSize = 54;
context->HeaderBuf = g_malloc(14 + 40 + 1024);
/* 14 for the BitmapFileHeader, 40 for the BitmapImageHeader and
1024 for the colormap */
context->BufferSize = 26;
context->buff = g_malloc(26);
context->BufferDone = 0;
/* 14 for the BitmapFileHeader, 12 for the BitmapImageHeader */
context->HeaderDone = 0;
context->Colormap = NULL;
context->LineWidth = 0;
context->LineBuf = NULL;
context->LineDone = 0;
context->Lines = 0;
context->Type = 0;
@ -376,17 +431,16 @@ static gboolean gdk_pixbuf__bmp_image_stop_load(gpointer data, GError **error)
g_return_val_if_fail(context != NULL, TRUE);
if (context->LineBuf != NULL)
g_free(context->LineBuf);
context->LineBuf = NULL;
if (context->compr.linebuff != NULL)
g_free(context->compr.linebuff);
if (context->HeaderBuf != NULL)
g_free(context->HeaderBuf);
context->LineBuf = NULL;
if (context->Colormap != NULL)
g_free(context->Colormap);
if (context->pixbuf)
gdk_pixbuf_unref(context->pixbuf);
g_free(context->buff);
g_free(context);
return TRUE;
@ -412,10 +466,10 @@ static void OneLine32(struct bmp_progressive_state *context)
context->pixbuf->rowstride *
context->Lines);
while (X < context->Header.width) {
Pixels[X * 4 + 0] = context->LineBuf[X * 4 + 2];
Pixels[X * 4 + 1] = context->LineBuf[X * 4 + 1];
Pixels[X * 4 + 2] = context->LineBuf[X * 4 + 0];
Pixels[X * 4 + 3] = context->LineBuf[X * 4 + 3];
Pixels[X * 4 + 0] = context->buff[X * 4 + 2];
Pixels[X * 4 + 1] = context->buff[X * 4 + 1];
Pixels[X * 4 + 2] = context->buff[X * 4 + 0];
Pixels[X * 4 + 3] = context->buff[X * 4 + 3];
X++;
}
@ -436,14 +490,36 @@ static void OneLine24(struct bmp_progressive_state *context)
context->pixbuf->rowstride *
context->Lines);
while (X < context->Header.width) {
Pixels[X * 3 + 0] = context->LineBuf[X * 3 + 2];
Pixels[X * 3 + 1] = context->LineBuf[X * 3 + 1];
Pixels[X * 3 + 2] = context->LineBuf[X * 3 + 0];
Pixels[X * 3 + 0] = context->buff[X * 3 + 2];
Pixels[X * 3 + 1] = context->buff[X * 3 + 1];
Pixels[X * 3 + 2] = context->buff[X * 3 + 0];
X++;
}
}
static void OneLine16(struct bmp_progressive_state *context)
{
gint X;
guchar *Pixels;
X = 0;
if (context->Header.Negative == 0)
Pixels = (context->pixbuf->pixels +
context->pixbuf->rowstride *
(context->Header.height - context->Lines - 1));
else
Pixels = (context->pixbuf->pixels +
context->pixbuf->rowstride *
context->Lines);
while (X < context->Header.width) {
Pixels[X * 3 + 0] = (GUINT16_FROM_LE (* (guint16 *) &context->buff[X * 2]) & 0x7C00) >> 7;
Pixels[X * 3 + 1] = (GUINT16_FROM_LE (* (guint16 *) &context->buff[X * 2]) & 0x03E0) >> 2;
Pixels[X * 3 + 2] = (GUINT16_FROM_LE (* (guint16 *) &context->buff[X * 2]) & 0x001F) << 3;
X++;
}
}
static void OneLine8(struct bmp_progressive_state *context)
{
gint X;
@ -460,11 +536,11 @@ static void OneLine8(struct bmp_progressive_state *context)
context->Lines);
while (X < context->Header.width) {
Pixels[X * 3 + 0] =
context->HeaderBuf[4 * context->LineBuf[X] + 56];
context->Colormap[context->buff[X]][2];
Pixels[X * 3 + 1] =
context->HeaderBuf[4 * context->LineBuf[X] + 55];
context->Colormap[context->buff[X]][1];
Pixels[X * 3 + 2] =
context->HeaderBuf[4 * context->LineBuf[X] + 54];
context->Colormap[context->buff[X]][0];
X++;
}
}
@ -487,23 +563,23 @@ static void OneLine4(struct bmp_progressive_state *context)
while (X < context->Header.width) {
guchar Pix;
Pix = context->LineBuf[X / 2];
Pix = context->buff[X / 2];
Pixels[X * 3 + 0] =
context->HeaderBuf[4 * (Pix >> 4) + 56];
context->Colormap[Pix >> 4][2];
Pixels[X * 3 + 1] =
context->HeaderBuf[4 * (Pix >> 4) + 55];
context->Colormap[Pix >> 4][1];
Pixels[X * 3 + 2] =
context->HeaderBuf[4 * (Pix >> 4) + 54];
context->Colormap[Pix >> 4][0];
X++;
if (X < context->Header.width) {
/* Handle the other 4 bit pixel only when there is one */
Pixels[X * 3 + 0] =
context->HeaderBuf[4 * (Pix & 15) + 56];
context->Colormap[Pix & 15][2];
Pixels[X * 3 + 1] =
context->HeaderBuf[4 * (Pix & 15) + 55];
context->Colormap[Pix & 15][1];
Pixels[X * 3 + 2] =
context->HeaderBuf[4 * (Pix & 15) + 54];
context->Colormap[Pix & 15][0];
X++;
}
}
@ -527,11 +603,11 @@ static void OneLine1(struct bmp_progressive_state *context)
while (X < context->Header.width) {
gint Bit;
Bit = (context->LineBuf[X / 8]) >> (7 - (X & 7));
Bit = (context->buff[X / 8]) >> (7 - (X & 7));
Bit = Bit & 1;
Pixels[X * 3 + 0] = Bit * 255;
Pixels[X * 3 + 1] = Bit * 255;
Pixels[X * 3 + 2] = Bit * 255;
Pixels[X * 3 + 0] = context->Colormap[Bit][2];
Pixels[X * 3 + 1] = context->Colormap[Bit][1];
Pixels[X * 3 + 2] = context->Colormap[Bit][0];
X++;
}
}
@ -539,7 +615,7 @@ static void OneLine1(struct bmp_progressive_state *context)
static void OneLine(struct bmp_progressive_state *context)
{
context->LineDone = 0;
context->BufferDone = 0;
if (context->Lines >= context->Header.height)
return;
@ -547,6 +623,8 @@ static void OneLine(struct bmp_progressive_state *context)
OneLine32(context);
if (context->Type == 24)
OneLine24(context);
if (context->Type == 16)
OneLine16(context);
if (context->Type == 8)
OneLine8(context);
if (context->Type == 4)
@ -567,147 +645,131 @@ static void OneLine(struct bmp_progressive_state *context)
}
}
/* DoCompressedByte handles 1 byte of incomming compressed data */
static void
DoCompressedByte(struct bmp_progressive_state *context, guchar ** buf,
gint * size)
DoCompressed(struct bmp_progressive_state *context)
{
gint BytesToCopy;
gint count, pos;
switch (context->compr.phase) {
case 0: /* Neutral state */
if ((*buf)[0] != 0) { /* run count */
context->compr.phase = 1;
context->compr.RunCount = (*buf)[0];
} else { /* Escape */
context->compr.phase = 2;
}
(*buf)++;
(*size)--;
break;
case 1: /* Run count received.... */
if (context->buff[0] != 0) { /* run count */
context->compr.RunCount = context->buff[0];
if (context->Type == 8)
context->compr.RunCount *= 2;
while (context->compr.RunCount > 0) {
BytesToCopy =
context->LineWidth - context->LineDone;
if (BytesToCopy > context->compr.RunCount)
BytesToCopy = context->compr.RunCount;
if (BytesToCopy > 0) {
memset(context->LineBuf +
context->LineDone, (*buf)[0],
BytesToCopy);
if (context->compr.linebuffdone & 1) {
guchar *ptr = context->compr.linebuff +
context->compr.linebuffdone / 2;
context->compr.RunCount -= BytesToCopy;
context->LineDone += BytesToCopy;
*ptr = (*ptr & 0xF0) | (context->buff[1] >> 4);
context->buff[1] = (context->buff[1] << 4) |
(context->buff[1] >> 4);
context->compr.linebuffdone++;
context->compr.RunCount--;
}
if ((context->LineDone >= context->LineWidth)
&& (context->LineWidth > 0)) {
OneLine(context);
if (context->compr.RunCount) {
count = context->compr.linebuffsize -
context->compr.linebuffdone;
if (count > context->compr.RunCount)
count = context->compr.RunCount;
memset (context->compr.linebuff +
context->compr.linebuffdone / 2,
context->buff[1],
(count + 1) / 2);
context->compr.RunCount -= count;
context->compr.linebuffdone += count;
}
if (context->compr.linebuffdone == context->compr.linebuffsize) {
guchar *tmp = context->buff;
context->buff = context->compr.linebuff;
OneLine (context);
context->buff = tmp;
if (context->compr.linebuffdone & 1)
context->buff[1] = (context->buff[1] << 4) |
(context->buff[1] >> 4);
context->compr.linebuffdone = 0;
}
}
context->compr.phase = 0;
(*buf)++;
(*size)--;
} else { /* Escape */
if (context->buff[1] == 0) { /* End of line */
if (context->compr.linebuffdone) {
guchar *tmp = context->buff;
context->buff = context->compr.linebuff;
OneLine (context);
context->buff = tmp;
context->compr.linebuffdone = 0;
}
} else if (context->buff[1] == 1) { /* End of image */
if (context->compr.linebuffdone) {
guchar *tmp = context->buff;
context->buff = context->compr.linebuff;
OneLine (context);
context->buff = tmp;
}
context->compr.phase = 2;
} else if (context->buff[1] == 2) /* Cursor displacement */
; /* not implemented */
else {
context->compr.phase = 1;
context->compr.RunCount = context->buff[1];
if (context->Type == 8)
context->compr.RunCount *= 2;
context->BufferSize = (context->compr.RunCount + 3) / 4 * 2;
context->buff = g_realloc (context->buff, context->BufferSize);
}
}
context->BufferDone = 0;
break;
case 2: /* Escape received */
if ((*buf)[0] == 0) { /* End of line */
context->compr.phase = 0;
if (context->LineDone > 0)
OneLine(context);
} else if ((*buf)[0] == 1) { /* End of image */
OneLine(context);
context->compr.phase = 6;
(*size) = 0;
break;
} else if ((*buf)[0] == 2) { /* Cursor displacement */
context->compr.phase = 4;
case 1:
pos = 0;
while (pos < context->compr.RunCount) {
count = context->compr.linebuffsize - context->compr.linebuffdone;
if (count > context->compr.RunCount)
count = context->compr.RunCount;
if ((context->compr.linebuffdone & 1) || (pos & 1)) {
gint i, newval;
guchar *ptr;
for (i = 0; i < count; i++) {
ptr = context->compr.linebuff + (i +
context->compr.linebuffdone) / 2;
newval = *(context->buff + (pos + i) / 2) & (0xf0 >> (((pos + i) % 2) * 4));
if (((pos + i) % 2) ^ ((context->compr.linebuffdone + i) % 2)) {
if ((pos + i) % 2)
newval <<= 4;
else
newval >>= 4;
}
*ptr = (*ptr & (0xf << (((i + context->compr.linebuffdone) % 2) * 4))) | newval;
}
} else {
context->compr.phase = 3;
context->compr.RunCount = (*buf)[0];
if (context->compr.RunCount & 1)
context->compr.phase = 7;
memmove (context->compr.linebuff +
context->compr.linebuffdone / 2,
context->buff + pos / 2,
(count + 1) / 2);
}
(*buf)++;
(*size)--;
pos += count;
context->compr.linebuffdone += count;
if (context->compr.linebuffdone == context->compr.linebuffsize) {
guchar *tmp = context->buff;
context->buff = context->compr.linebuff;
OneLine (context);
context->buff = tmp;
break;
case 3:
while ((context->compr.RunCount > 0)
&& (*size > 0)) {
BytesToCopy =
context->LineWidth - context->LineDone;
if (BytesToCopy > context->compr.RunCount)
BytesToCopy = context->compr.RunCount;
if (BytesToCopy > *size)
BytesToCopy = *size;
if (BytesToCopy > 0) {
memcpy(context->LineBuf +
context->LineDone, *buf,
BytesToCopy);
context->compr.RunCount -= BytesToCopy;
(*buf) += BytesToCopy;
(*size) -= BytesToCopy;
context->LineDone += BytesToCopy;
context->compr.linebuffdone = 0;
}
if ((context->LineDone >= context->LineWidth)
&& (context->LineWidth > 0))
OneLine(context);
}
if (context->compr.RunCount <= 0)
context->compr.phase = 0;
context->BufferSize = 2;
context->buff = g_realloc (context->buff, context->BufferSize);
context->BufferDone = 0;
break;
case 4:
context->compr.phase = 5;
context->compr.XDelta = (*buf)[0];
(*buf)++;
(*size)--;
break;
case 5:
context->compr.phase = 0;
context->compr.YDelta = (*buf)[0];
g_assert(0); /* No implementatio of this yet */
/* If this happens, please email me (arjan@fenrus.demon.nl)
the image concerned. */
(*buf)++;
(*size)--;
break;
case 6:
(*size) = 0;
break;
case 7: /* Odd raw run */
while ((context->compr.RunCount > 0) && (*size > 0)) {
BytesToCopy =
context->LineWidth - context->LineDone;
if (BytesToCopy > context->compr.RunCount)
BytesToCopy = context->compr.RunCount;
if (BytesToCopy > *size)
BytesToCopy = *size;
if (BytesToCopy > 0) {
memcpy(context->LineBuf +
context->LineDone, *buf,
BytesToCopy);
context->compr.RunCount -= BytesToCopy;
(*buf) += BytesToCopy;
(*size) -= BytesToCopy;
context->LineDone += BytesToCopy;
}
if ((context->LineDone >= context->LineWidth)
&& (context->LineWidth > 0))
OneLine(context);
}
if (context->compr.RunCount <= 0)
context->compr.phase = 8;
break;
case 8: /* Eat dummy byte; */
(*buf)++;
(*size)--;
context->compr.phase = 0;
case 2:
context->BufferDone = 0;
break;
}
}
@ -731,55 +793,37 @@ gdk_pixbuf__bmp_image_load_increment(gpointer data,
gint BytesToCopy;
while (size > 0) {
g_assert(context->LineDone >= 0);
if (context->HeaderDone < context->HeaderSize) { /* We still
if (context->BufferDone < context->BufferSize) { /* We still
have headerbytes to do */
BytesToCopy =
context->HeaderSize - context->HeaderDone;
context->BufferSize - context->BufferDone;
if (BytesToCopy > size)
BytesToCopy = size;
memmove(context->HeaderBuf + context->HeaderDone,
memmove(context->buff + context->BufferDone,
buf, BytesToCopy);
size -= BytesToCopy;
buf += BytesToCopy;
context->HeaderDone += BytesToCopy;
} else if (context->Compressed) {
/* Compression is done 1 byte at a time for now */
DoCompressedByte(context, &buf, &size);
} else {
/* Uncompressed pixeldata */
BytesToCopy =
context->LineWidth - context->LineDone;
if (BytesToCopy > size)
BytesToCopy = size;
if (BytesToCopy > 0) {
memmove(context->LineBuf +
context->LineDone, buf,
BytesToCopy);
size -= BytesToCopy;
buf += BytesToCopy;
context->LineDone += BytesToCopy;
}
if ((context->LineDone >= context->LineWidth)
&& (context->LineWidth > 0))
OneLine(context);
context->BufferDone += BytesToCopy;
if (context->BufferDone != context->BufferSize)
break;
}
if (context->HeaderDone >= 14 + 40)
if (!DecodeHeader(context->HeaderBuf,
context->HeaderBuf + 14, context,
if (!context->Header.size) {
if (!DecodeHeader (context->buff,
context->buff + 14, context,
error))
return FALSE;
}
else if (context->Type <= 8 && context->Colormap == NULL)
DecodeColormap (context->buff, context, error);
else if (context->Compressed != BI_RGB)
DoCompressed(context);
else
/* Uncompressed pixeldata */
OneLine(context);
}
return TRUE;