Commit d3d54550 authored by Jonathan Blandford's avatar Jonathan Blandford Committed by Jonathan Blandford

new patch from Arjan to handle compressed bmps.

1999-11-24  Jonathan Blandford  <jrb@redhat.com>

	* src/io-bmp.c (OneLine24): new patch from Arjan to handle
	compressed bmps.
parent b3472ff0
......@@ -47,29 +47,70 @@ struct headerpair {
guint width;
guint height;
guint depth;
guint Negative; /* Negative = 1 -> top down BMP,
Negative = 0 -> bottom up BMP */
};
/*
These structures are actually dummies. These are according to
the "Windows API reference guide volume II" as written by Borland,
but GCC fiddles with the alignment of the internal members.
*/
struct BitmapFileHeader {
gushort bfType;
guint bfSize;
guint reserverd;
guint bfOffbits;
gushort bfType;
guint bfSize;
guint reserverd;
guint bfOffbits;
};
struct BitmapInfoHeader {
guint biSize;
guint biWidth;
guint biHeight;
gushort biPlanes;
gushort biBitCount;
guint biCompression;
guint biSizeImage;
guint biXPelsPerMeter;
guint biYPelsPerMeter;
guint biClrUsed;
guint biClrImportant;
guint biSize;
guint biWidth;
guint biHeight;
gushort biPlanes;
gushort biBitCount;
guint biCompression;
guint biSizeImage;
guint biXPelsPerMeter;
guint biYPelsPerMeter;
guint biClrUsed;
guint biClrImportant;
};
static void DumpBIH(unsigned char *BIH)
{ /* For debugging */
printf("biSize = %i \n",
(BIH[3] << 24) + (BIH[2] << 16) + (BIH[1] << 8) + (BIH[0]));
printf("biWidth = %i \n",
(BIH[7] << 24) + (BIH[6] << 16) + (BIH[5] << 8) + (BIH[4]));
printf("biHeight = %i \n",
(BIH[11] << 24) + (BIH[10] << 16) + (BIH[9] << 8) +
(BIH[8]));
printf("biPlanes = %i \n", (BIH[13] << 8) + (BIH[12]));
printf("biBitCount = %i \n", (BIH[15] << 8) + (BIH[14]));
printf("biCompress = %i \n",
(BIH[19] << 24) + (BIH[18] << 16) + (BIH[17] << 8) +
(BIH[16]));
printf("biSizeImage = %i \n",
(BIH[23] << 24) + (BIH[22] << 16) + (BIH[21] << 8) +
(BIH[20]));
printf("biXPels = %i \n",
(BIH[27] << 24) + (BIH[26] << 16) + (BIH[25] << 8) +
(BIH[24]));
printf("biYPels = %i \n",
(BIH[31] << 24) + (BIH[30] << 16) + (BIH[29] << 8) +
(BIH[28]));
printf("biClrUsed = %i \n",
(BIH[35] << 24) + (BIH[34] << 16) + (BIH[33] << 8) +
(BIH[32]));
printf("biClrImprtnt= %i \n",
(BIH[39] << 24) + (BIH[38] << 16) + (BIH[37] << 8) +
(BIH[36]));
}
/*
This does a byte-order swap. Does glib have something like
be32_to_cpu() ??
......@@ -91,7 +132,20 @@ static void free_buffer(gpointer user_data, gpointer data)
}
/* 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 RunCount;
gint XDelta;
gint YDelta;
};
/* Progressive loading */
......@@ -114,13 +168,11 @@ struct bmp_progressive_state {
8 = 8 bit colormapped
1 = 1 bit bitonal
*/
gint Compressed;
struct bmp_compression_state compr;
struct headerpair Header; /* Decoded (BE->CPU) header */
struct BitmapFileHeader BFH;
struct BitmapInfoHeader BIH;
GdkPixbuf *pixbuf; /* Our "target" */
......@@ -141,19 +193,21 @@ GdkPixbuf *image_load(FILE * f)
size_t length;
struct bmp_progressive_state *State;
int fd;
GdkPixbuf *pb;
State = image_begin_load(NULL, NULL, NULL);
membuf = g_malloc(4096);
g_assert(membuf != NULL);
while (feof(f) == 0) {
length = fread(membuf, 1, 4096, f);
image_load_increment(State, membuf, length);
}
if (length > 0)
image_load_increment(State, membuf, length);
}
g_free(membuf);
if (State->pixbuf != NULL)
gdk_pixbuf_ref(State->pixbuf);
......@@ -164,16 +218,36 @@ GdkPixbuf *image_load(FILE * f)
return State->pixbuf;
}
static void DecodeHeader(unsigned char *BFH,unsigned char *BIH,
struct bmp_progressive_state *State)
static void DecodeHeader(unsigned char *BFH, unsigned char *BIH,
struct bmp_progressive_state *State)
{
State->Header.width = (BIH[7]<<24)+(BIH[6]<<16)+(BIH[5]<<8)+(BIH[4]);
State->Header.height = (BIH[11]<<24)+(BIH[10]<<16)+(BIH[9]<<8)+(BIH[8]);
State->Header.depth = (BIH[15]<<8)+(BIH[14]);;
/* DumpBIH(BIH);*/
State->Header.width =
(BIH[7] << 24) + (BIH[6] << 16) + (BIH[5] << 8) + (BIH[4]);
State->Header.height =
(BIH[11] << 24) + (BIH[10] << 16) + (BIH[9] << 8) + (BIH[8]);
State->Header.depth = (BIH[15] << 8) + (BIH[14]);;
State->Type = State->Header.depth; /* This may be less trivial someday */
State->HeaderSize =
((BFH[13]<<24)+(BFH[12]<<16)+(BFH[11]<<8)+(BFH[10]));
State->HeaderSize =
((BFH[13] << 24) + (BFH[12] << 16) + (BFH[11] << 8) +
(BFH[10]));
if (State->HeaderSize >= 14 + 40 + 768 + 512)
State->HeaderSize = 14 + 40 + 768 + 512 - 1;
if ((BIH[16] != 0) || (BIH[17] != 0) || (BIH[18] != 0)
|| (BIH[19] != 0)) {
State->Compressed = 1;
}
if (State->Header.height < 0) {
State->Header.height = -State->Header.height;
State->Header.Negative = 1;
}
if (State->Header.width < 0) {
State->Header.width = -State->Header.width;
State->Header.Negative = 0;
}
if (State->Type == 24)
State->LineWidth = State->Header.width * 3;
......@@ -184,11 +258,11 @@ static void DecodeHeader(unsigned char *BFH,unsigned char *BIH,
if ((State->Header.width & 7) != 0)
State->LineWidth++;
}
/* Pad to a 32 bit boundary */
if ((State->LineWidth%4)>0)
State->LineWidth=(State->LineWidth%4)*4+4;
if (((State->LineWidth % 4) > 0) && (State->Compressed == 0))
State->LineWidth = (State->LineWidth / 4) * 4 + 4;
if (State->LineBuf == NULL)
State->LineBuf = g_malloc(State->LineWidth);
......@@ -198,16 +272,17 @@ static void DecodeHeader(unsigned char *BFH,unsigned char *BIH,
if (State->pixbuf == NULL) {
State->pixbuf =
gdk_pixbuf_new(ART_PIX_RGB, FALSE, 8,
(gint) State->Header.width,
(gint) State->Header.height);
gdk_pixbuf_new(ART_PIX_RGB, FALSE, 8,
(gint) State->Header.width,
(gint) State->Header.height);
if (State->prepared_func != NULL)
/* Notify the client that we are ready to go */
(*State->prepared_func) (State->pixbuf,
State->user_data);
}
}
/*
......@@ -228,9 +303,8 @@ image_begin_load(ModulePreparedNotifyFunc prepared_func,
context->user_data = user_data;
context->HeaderSize = 54;
context->HeaderBuf = g_malloc(14 +
40 + 768);
/* 768 for the colormap */
context->HeaderBuf = g_malloc(14 + 40 + 768 + 512);
/* 768 for the colormap */
context->HeaderDone = 0;
context->LineWidth = 0;
......@@ -241,6 +315,7 @@ image_begin_load(ModulePreparedNotifyFunc prepared_func,
context->Type = 0;
memset(&context->Header, 0, sizeof(struct headerpair));
memset(&context->compr, 0, sizeof(struct bmp_compression_state));
context->pixbuf = NULL;
......@@ -264,6 +339,7 @@ void image_stop_load(gpointer data)
if (context->LineBuf != NULL)
g_free(context->LineBuf);
context->LineBuf = NULL;
if (context->HeaderBuf != NULL)
g_free(context->HeaderBuf);
......@@ -280,8 +356,14 @@ static void OneLine24(struct bmp_progressive_state *context)
guchar *Pixels;
X = 0;
Pixels = context->pixbuf->art_pixbuf->pixels +
context->pixbuf->art_pixbuf->rowstride * (context->Header.height-context->Lines);
if (context->Header.Negative == 0)
Pixels = context->pixbuf->art_pixbuf->pixels +
gdk_pixbuf_get_rowstride(context->pixbuf) *
(context->Header.height - context->Lines - 1);
else
Pixels = context->pixbuf->art_pixbuf->pixels +
gdk_pixbuf_get_rowstride(context->pixbuf) *
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];
......@@ -297,16 +379,22 @@ static void OneLine8(struct bmp_progressive_state *context)
guchar *Pixels;
X = 0;
Pixels = context->pixbuf->art_pixbuf->pixels +
context->pixbuf->art_pixbuf->rowstride * (context->Header.height-context->Lines);
if (context->Header.Negative == 0)
Pixels = context->pixbuf->art_pixbuf->pixels +
gdk_pixbuf_get_rowstride(context->pixbuf) *
(context->Header.height - context->Lines - 1);
else
Pixels = context->pixbuf->art_pixbuf->pixels +
gdk_pixbuf_get_rowstride(context->pixbuf) *
context->Lines;
while (X < context->Header.width) {
/* The joys of having a BGR byteorder */
Pixels[X * 3 + 0] =
context->HeaderBuf[4*context->LineBuf[X] + 56];
context->HeaderBuf[4 * context->LineBuf[X] + 56];
Pixels[X * 3 + 1] =
context->HeaderBuf[4*context->LineBuf[X] + 55];
context->HeaderBuf[4 * context->LineBuf[X] + 55];
Pixels[X * 3 + 2] =
context->HeaderBuf[4*context->LineBuf[X] + 54];
context->HeaderBuf[4 * context->LineBuf[X] + 54];
X++;
}
}
......@@ -317,20 +405,23 @@ static void OneLine1(struct bmp_progressive_state *context)
guchar *Pixels;
X = 0;
Pixels = context->pixbuf->art_pixbuf->pixels +
context->pixbuf->art_pixbuf->rowstride * (context->Header.height-context->Lines);
if (context->Header.Negative == 0)
Pixels = context->pixbuf->art_pixbuf->pixels +
gdk_pixbuf_get_rowstride(context->pixbuf) *
(context->Header.height - context->Lines - 1);
else
Pixels = context->pixbuf->art_pixbuf->pixels +
gdk_pixbuf_get_rowstride(context->pixbuf) *
context->Lines;
while (X < context->Header.width) {
int Bit;
Bit = (context->LineBuf[X/8])>>(7-(X&7));
Bit = (context->LineBuf[X / 8]) >> (7 - (X & 7));
Bit = Bit & 1;
/* The joys of having a BGR byteorder */
Pixels[X * 3 + 0] =
context->HeaderBuf[Bit + 32];
Pixels[X * 3 + 1] =
context->HeaderBuf[Bit + 2 + 32];
Pixels[X * 3 + 2] =
context->HeaderBuf[Bit + 4 + 32];
Pixels[X * 3 + 0] = context->HeaderBuf[Bit + 32];
Pixels[X * 3 + 1] = context->HeaderBuf[Bit + 2 + 32];
Pixels[X * 3 + 2] = context->HeaderBuf[Bit + 4 + 32];
X++;
}
}
......@@ -338,6 +429,10 @@ static void OneLine1(struct bmp_progressive_state *context)
static void OneLine(struct bmp_progressive_state *context)
{
context->LineDone = 0;
if (context->Lines >= context->Header.height)
return;
if (context->Type == 24)
OneLine24(context);
if (context->Type == 8)
......@@ -345,9 +440,6 @@ static void OneLine(struct bmp_progressive_state *context)
if (context->Type == 1)
OneLine1(context);
context->LineDone = 0;
if (context->Lines > context->Header.height)
return;
context->Lines++;
if (context->updated_func != NULL) {
......@@ -376,6 +468,7 @@ gboolean image_load_increment(gpointer data, guchar * buf, guint size)
gint BytesToCopy;
while (size > 0) {
g_assert(context->LineDone >= 0);
if (context->HeaderDone < context->HeaderSize) { /* We still
have headerbytes to do */
BytesToCopy =
......@@ -390,6 +483,124 @@ gboolean image_load_increment(gpointer data, guchar * buf, guint size)
buf += BytesToCopy;
context->HeaderDone += BytesToCopy;
} else if (context->Compressed) {
/* Compression is done 1 at a time for now */
switch (context->compr.phase) {
case 0:
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.... */
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);
context->compr.RunCount -=
BytesToCopy;
context->LineDone +=
BytesToCopy;
}
if (
(context->LineDone >=
context->LineWidth)
&& (context->LineWidth > 0)) {
OneLine(context);
}
}
context->compr.phase = 0;
buf++;
size--;
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;
} else {
context->compr.phase = 3;
context->compr.RunCount = buf[0];
}
buf++;
size--;
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;
}
if (
(context->LineDone >=
context->LineWidth)
&& (context->LineWidth > 0))
OneLine(context);
}
if (context->compr.RunCount <= 0)
context->compr.phase = 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 */
buf++;
size--;
break;
case 6:
size = 0;
}
} else {
/* Pixeldata only */
BytesToCopy =
......@@ -413,9 +624,9 @@ gboolean image_load_increment(gpointer data, guchar * buf, guint size)
}
if (context->HeaderDone >= 14+40)
DecodeHeader(context->HeaderBuf,context->HeaderBuf+14,
context);
if (context->HeaderDone >= 14 + 40)
DecodeHeader(context->HeaderBuf,
context->HeaderBuf + 14, context);
}
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment