/* Possible states we can be in. */
enum {
GIF_START = 1,
- GIF_GET_COLORMAP = 2,
- GIF_GET_NEXT_STEP = 3,
- GIF_GET_EXTENTION = 4,
- GIF_GET_COLORMAP2 = 5,
- GIF_PREPARE_LZW = 6,
- GIF_GET_LZW = 7,
- GIF_DONE = 8
+ GIF_GET_COLORMAP,
+ GIF_GET_NEXT_STEP,
+ GIF_GET_FRAME_INFO,
+ GIF_GET_EXTENTION,
+ GIF_GET_COLORMAP2,
+ GIF_PREPARE_LZW,
+ GIF_LZW_FILL_BUFFER,
+ GIF_GET_LZW,
+ GIF_DONE,
};
guint size;
guint amount_needed;
- /* our colormap context */
+ /* colormap context */
gint colormap_index;
gint colormap_flag;
- /* our extension context */
+ /* extension context */
guchar extension_label;
guchar extension_flag;
/* get block context */
guchar block_count;
- guchar block_buf[256];
+ guchar block_buf[280];
gint block_ptr;
- /* our lwz context */
+ /* get_code context */
+ int code_curbit;
+ int code_lastbit;
+ int code_done;
+ int code_last_byte;
+
+ /* lwz context */
gint lwz_fresh;
gint lwz_code_size;
guchar lwz_set_code_size;
gint lwz_table[2][(1 << MAX_LWZ_BITS)];
gint lwz_stack[(1 << (MAX_LWZ_BITS)) * 2];
gint *lwz_sp;
+
+ /* painting context */
+ gint draw_xpos;
+ gint draw_ypos;
+ gint draw_pass;
};
static int GetDataBlock (GifContext *, unsigned char *);
-static int GetCode (GifContext *, int, int);
-static int LWZReadByte (GifContext *);
+static int GetCode (GifContext *, int);
+/* Returns TRUE if Read is OK,
+ * FALSE if more memory is needed. */
+static int count = 0;
static int
ReadOK (GifContext *context, guchar *buffer, size_t len)
{
- static int count = 0;
- count += len;
- g_print ("size :%d\tcount :%d\n", len, count);
- if (context->file)
- return fread(buffer, len, 1, context->file) != 0;
- else {
- if ((context->size - context->ptr) < len) {
+ gint retval, i;
+ if (context->file) {
+ count += len;
+#ifdef IO_GIFDEBUG
+ g_print ("Fsize :%d\tcount :%d\t", len, count);
+#endif
+ retval = (fread(buffer, len, 1, context->file) != 0);
+#ifdef IO_GIFDEBUG
+ if (len < 100) {
+ for (i = 0; i < len; i++)
+ g_print ("%d ", buffer[i]);
+ }
+ g_print ("\n");
+#endif
+ return retval;
+ } else {
+#ifdef IO_GIFDEBUG
+ g_print ("\tlooking for %d bytes. size == %d, ptr == %d\n", len, context->size, context->ptr);
+#endif
+ if ((context->size - context->ptr) >= len) {
+ count += len;
memcpy (buffer, context->buf + context->ptr, len);
context->ptr += len;
context->amount_needed = 0;
- return 0;
+#ifdef IO_GIFDEBUG
+ g_print ("Psize :%d\tcount :%d\t", len, count);
+ if (len < 100) {
+ for (i = 0; i < len; i++)
+ g_print ("%d ", buffer[i]);
+ }
+ g_print ("\n");
+#endif
+ return TRUE;
}
context->amount_needed = len - (context->size - context->ptr);
}
- return 1;
+ return 0;
}
/*
* Return vals.
+ * Unless otherwise specified, these are the return vals for most functions:
*
- * for the gif_get* functions,
- *-1 -> more bytes needed.
- * 0 -> success
- * 1 -> failure; abort the load
+ * 0 -> success
+ * -1 -> more bytes needed.
+ * -2 -> failure; abort the load
+ * -3 -> control needs to be passed back to the main loop
+ * \_ (most of the time returning 0 will get this, but not always)
*/
* context->block_count is 0 before we read in the function.
*
* As a result, context->block_count MUST be 0 the first time the get_data_block is called
- * within a context.
+ * within a context, and cannot be 0 the second time it's called.
*/
static int
}
if (context->block_count == 0)
- if (empty_block)
+ if (empty_block) {
*empty_block = TRUE;
-
- return 0;
+ return 0;
+ }
if (!ReadOK (context, buf, context->block_count)) {
return -1;
static void
gif_set_get_extension (GifContext *context)
{
- g_print ("getting the extension woooooo\n");
context->state = GIF_GET_EXTENTION;
context->extension_flag = TRUE;
context->extension_label = '\000';
gint retval;
gint empty_block = FALSE;
- g_print ("in gif_get_extension\n");
if (context->extension_flag) {
if (!context->extension_label) {
if (!ReadOK (context, &context->extension_label , 1)) {
}
/* Now we've successfully loaded this one, we continue on our way */
+ context->block_count = 0;
context->extension_flag = FALSE;
default:
/* Unhandled extension */
return context->block_count;
}
+#if 0
static int
GetCode (GifContext *context,
- int code_size,
- int flag)
+ int code_size)
{
- static unsigned char buf[280];
- static int curbit, lastbit, done, last_byte;
int i, j, ret;
unsigned char count;
- if (flag) {
- curbit = 0;
- lastbit = 0;
- done = FALSE;
- return 0;
- }
- if ((curbit + code_size) >= lastbit){
- if (done) {
- if (curbit >= lastbit) {
+ if ((context->code_curbit + code_size) >= context->code_lastbit){
+ if (context->code_done) {
+ if (context->code_curbit >= context->code_lastbit) {
/*g_message (_("GIF: ran off the end of by bits\n"));*/
- return -1;
+ return -2;
}
- return -1;
+ return -2;
}
- buf[0] = buf[last_byte - 2];
- buf[1] = buf[last_byte - 1];
+ context->block_buf[0] = context->block_buf[context->code_last_byte - 2];
+ context->block_buf[1] = context->block_buf[context->code_last_byte - 1];
- if ((count = GetDataBlock (context, &buf[2])) == 0)
- done = TRUE;
+ context->block_count = 0;
+
+ if ((count = GetDataBlock (context, &context->block_buf[2])) == 0)
+ context->code_done = TRUE;
- last_byte = 2 + count;
- curbit = (curbit - lastbit) + 16;
- lastbit = (2 + count) * 8;
+ context->code_last_byte = 2 + count;
+ context->code_curbit = (context->code_curbit - context->code_lastbit) + 16;
+ context->code_lastbit = (2 + count) * 8;
}
ret = 0;
- for (i = curbit, j = 0; j < code_size; ++i, ++j)
- ret |= ((buf[i / 8] & (1 << (i % 8))) != 0) << j;
+ for (i = context->code_curbit, j = 0; j < code_size; ++i, ++j)
+ ret |= ((context->block_buf[i / 8] & (1 << (i % 8))) != 0) << j;
- curbit += code_size;
+ context->code_curbit += code_size;
return ret;
}
+#endif
+
+static void
+gif_set_lzw_fill_buffer (GifContext *context)
+{
+ context->block_count = 0;
+ context->state = GIF_LZW_FILL_BUFFER;
+}
static int
-LWZReadByte (GifContext *context)
+gif_lzw_fill_buffer (GifContext *context)
+{
+ gint retval;
+
+ if (context->code_done) {
+ if (context->code_curbit >= context->code_lastbit) {
+ g_message ("GIF: ran off the end of by bits\n");
+ return -2;
+ }
+ g_message ("trying to read more data after we've done stuff\n");
+ return -2;
+ }
+
+ context->block_buf[0] = context->block_buf[context->code_last_byte - 2];
+ context->block_buf[1] = context->block_buf[context->code_last_byte - 1];
+
+ retval = get_data_block (context, &context->block_buf[2], NULL);
+
+ if (retval == -1)
+ return -1;
+
+ if (context->block_count == 0)
+ context->code_done = TRUE;
+
+ context->code_last_byte = 2 + context->block_count;
+ context->code_curbit = (context->code_curbit - context->code_lastbit) + 16;
+ context->code_lastbit = (2 + context->block_count) * 8;
+
+ context->state = GIF_GET_LZW;
+ return 0;
+}
+
+static int
+GetCode (GifContext *context,
+ int code_size)
+{
+ int i, j, ret;
+
+ if ((context->code_curbit + code_size) >= context->code_lastbit){
+ gif_set_lzw_fill_buffer (context);
+ return -3;
+ }
+
+ ret = 0;
+ for (i = context->code_curbit, j = 0; j < code_size; ++i, ++j)
+ ret |= ((context->block_buf[i / 8] & (1 << (i % 8))) != 0) << j;
+
+ context->code_curbit += code_size;
+
+ return ret;
+}
+
+/*
+ * For various reasons, this one is a little different from the others:
+ *
+ * returns -1 if it needs more bytes.
+ * returns -2 if there's an error.
+ * returns -3 if there is no error, but needs to go back to the main loop.
+ * returns the byte otherwise.
+ */
+
+static int
+lwz_read_byte (GifContext *context)
{
int code, incode;
+ gint retval;
register int i;
if (context->lwz_fresh) {
context->lwz_fresh = FALSE;
do {
- context->lwz_firstcode = context->lwz_oldcode = GetCode (context, context->lwz_code_size, FALSE);
+ retval = GetCode (context, context->lwz_code_size);
+ if (retval < 0) {
+ return retval;
+ }
+
+ context->lwz_firstcode = context->lwz_oldcode = retval;
} while (context->lwz_firstcode == context->lwz_clear_code);
return context->lwz_firstcode;
}
if (context->lwz_sp > context->lwz_stack)
return *--(context->lwz_sp);
- while ((code = GetCode (context, context->lwz_code_size, FALSE)) >= 0) {
+ while ((code = GetCode (context, context->lwz_code_size)) >= 0) {
if (code == context->lwz_clear_code) {
for (i = 0; i < context->lwz_clear_code; ++i) {
context->lwz_table[0][i] = 0;
context->lwz_max_code = context->lwz_clear_code + 2;
context->lwz_sp = context->lwz_stack;
context->lwz_firstcode = context->lwz_oldcode =
- GetCode (context, context->lwz_code_size, FALSE);
+ GetCode (context, context->lwz_code_size);
return context->lwz_firstcode;
} else if (code == context->lwz_end_code) {
int count;
unsigned char buf[260];
+ g_error (" DID WE EVER EVER GET HERE\n");
+
if (ZeroDataBlock)
return -2;
if (code == context->lwz_table[0][code]) {
/*g_message (_("GIF: circular table entry BIG ERROR\n"));*/
/*gimp_quit ();*/
- return -1;
+ return -2;
}
code = context->lwz_table[0][code];
}
return code;
}
+
static void
+gif_set_get_lzw (GifContext *context)
+{
+ context->state = GIF_GET_LZW;
+ context->draw_xpos = 0;
+ context->draw_ypos = 0;
+ context->draw_pass = 0;
+}
+
+static int
gif_get_lzw (GifContext *context)
{
guchar *dest, *temp;
- gint xpos = 0, ypos = 0, pass = 0;
gint v;
- context->pixbuf = gdk_pixbuf_new (ART_PIX_RGB,
- context->gif89.transparent,
- 8,
- context->width,
- context->height);
+
+ if (context->pixbuf == NULL) {
+ context->pixbuf = gdk_pixbuf_new (ART_PIX_RGB,
+ context->gif89.transparent,
+ 8,
+ context->width,
+ context->height);
+
+ if (context->func)
+ (* context->func) (context->pixbuf, context->user_data);
+ }
dest = gdk_pixbuf_get_pixels (context->pixbuf);
- while ((v = LWZReadByte ( context)) >= 0) {
+ while (TRUE) {
+ v = lwz_read_byte (context);
+ if (v < 0) {
+ return v;
+ }
+
+
if (context->gif89.transparent) {
- temp = dest + ypos * gdk_pixbuf_get_rowstride (context->pixbuf) + xpos * 4;
+ temp = dest + context->draw_ypos * gdk_pixbuf_get_rowstride (context->pixbuf) + context->draw_xpos * 4;
*temp = context->color_map [0][(guchar) v];
*(temp+1) = context->color_map [1][(guchar) v];
*(temp+2) = context->color_map [2][(guchar) v];
*(temp+3) = (guchar) ((v == context->gif89.transparent) ? 0 : 65535);
} else {
- temp = dest + ypos * gdk_pixbuf_get_rowstride (context->pixbuf) + xpos * 3;
+ temp = dest + context->draw_ypos * gdk_pixbuf_get_rowstride (context->pixbuf) + context->draw_xpos * 3;
*temp = context->color_map [0][(guchar) v];
*(temp+1) = context->color_map [1][(guchar) v];
*(temp+2) = context->color_map [2][(guchar) v];
}
- xpos++;
- if (xpos == context->frame_len) {
- xpos = 0;
+ context->draw_xpos++;
+ if (context->draw_xpos == context->frame_len) {
+ context->draw_xpos = 0;
if (context->frame_interlace) {
- switch (pass) {
+ switch (context->draw_pass) {
case 0:
case 1:
- ypos += 8;
+ context->draw_ypos += 8;
break;
case 2:
- ypos += 4;
+ context->draw_ypos += 4;
break;
case 3:
- ypos += 2;
+ context->draw_ypos += 2;
break;
}
- if (ypos >= context->frame_height) {
- pass++;
- switch (pass) {
+ if (context->draw_ypos >= context->frame_height) {
+ context->draw_pass++;
+ switch (context->draw_pass) {
case 1:
- ypos = 4;
+ context->draw_ypos = 4;
break;
case 2:
- ypos = 2;
+ context->draw_ypos = 2;
break;
case 3:
- ypos = 1;
+ context->draw_ypos = 1;
break;
default:
goto done;
}
}
} else {
- ypos++;
+ context->draw_ypos++;
}
}
- if (ypos >= context->frame_height)
+ if (context->draw_ypos >= context->frame_height)
break;
}
-
done:
/* we got enough data. there may be more (ie, newer layers) but we can quit now */
context->state = GIF_DONE;
+ return 0;
}
+static void
+gif_set_prepare_lzw (GifContext *context)
+{
+ context->state = GIF_PREPARE_LZW;
+}
static int
gif_prepare_lzw (GifContext *context)
{
context->lwz_end_code = context->lwz_clear_code + 1;
context->lwz_max_code_size = 2 * context->lwz_clear_code;
context->lwz_max_code = context->lwz_clear_code + 2;
-
- GetCode (context, 0, TRUE);
-
context->lwz_fresh = TRUE;
+ context->code_curbit = 0;
+ context->code_lastbit = 0;
+ context->code_done = FALSE;
for (i = 0; i < context->lwz_clear_code; ++i) {
context->lwz_table[0][i] = 0;
context->lwz_table[0][i] = context->lwz_table[1][0] = 0;
context->lwz_sp = context->lwz_stack;
+ gif_set_get_lzw (context);
+
return 0;
}
return 0;
}
+static void
+gif_set_get_frame_info (GifContext *context)
+{
+ context->state = GIF_GET_FRAME_INFO;
+}
+
+static gint
+gif_get_frame_info (GifContext *context)
+{
+ unsigned char buf[9];
+ if (!ReadOK (context, buf, 9)) {
+ return -1;
+ }
+ /* Okay, we got all the info we need. Lets record it */
+ context->frame_len = LM_to_uint (buf[4], buf[5]);
+ context->frame_height = LM_to_uint (buf[6], buf[7]);
+ if (context->frame_height > context->height) {
+ context->state = GIF_DONE;
+ return -2;
+ }
+
+ context->frame_interlace = BitSet (buf[8], INTERLACE);
+ if (BitSet (buf[8], LOCALCOLORMAP)) {
+ /* Does this frame have it's own colormap. */
+ /* really only relevant when looking at the first frame
+ * of an animated gif. */
+ /* if it does, we need to re-read in the colormap,
+ * the gray_scale, and the bit_pixel */
+ context->bit_pixel = 1 << ((buf[8] & 0x07) + 1);
+ gif_set_get_colormap2 (context);
+ return 0;
+ }
+ gif_set_prepare_lzw (context);
+ return 0;
+
+}
+
static gint
gif_get_next_step (GifContext *context)
{
- unsigned char buf[16];
unsigned char c;
- for (;;) {
+ while (TRUE) {
if (!ReadOK (context, &c, 1)) {
return -1;
}
- g_print ("c== %c\n", c);
if (c == ';') {
/* GIF terminator */
/* hmm. Not 100% sure what to do about this. Should
* i try to return a blank image instead? */
context->state = GIF_DONE;
- return 1;
+ return -2;
}
if (c == '!') {
/* Not a valid start character */
continue;
}
-
- if (!ReadOK (context, buf, 9)) {
- return -1;
- }
-
- /* Okay, we got all the info we need. Lets record it */
- context->frame_len = LM_to_uint (buf[4], buf[5]);
- context->frame_height = LM_to_uint (buf[6], buf[7]);
- if (context->frame_height > context->height) {
- context->state = GIF_DONE;
- return 1;
- }
-
- context->frame_interlace = BitSet (buf[8], INTERLACE);
- if (BitSet (buf[8], LOCALCOLORMAP)) {
- /* Does this frame have it's own colormap. */
- /* really only relevant when looking at the first frame
- * of an animated gif. */
- /* if it does, we need to re-read in the colormap,
- * the gray_scale, and the bit_pixel */
- context->bit_pixel = 1 << ((buf[8] & 0x07) + 1);
- gif_set_get_colormap2 (context);
- return 0;
- }
- context->state = GIF_PREPARE_LZW;
+ /* assume it's frame info */
+ gif_set_get_frame_info (context);
return 0;
}
- g_assert_not_reached ();
- return 1;
}
do {
switch (context->state) {
case GIF_START:
- g_print ("in GIF_START\n");
retval = gif_init (context);
break;
case GIF_GET_COLORMAP:
- g_print ("in GIF_GET_COLORMAP\n");
retval = gif_get_colormap (context);
if (retval == 0)
context->state = GIF_GET_NEXT_STEP;
break;
case GIF_GET_NEXT_STEP:
- g_print ("in GIF_GET_NEXT_STEP\n");
retval = gif_get_next_step (context);
break;
+ case GIF_GET_FRAME_INFO:
+ retval = gif_get_frame_info (context);
+ break;
+
case GIF_GET_EXTENTION:
- g_print ("in GIF_GET_EXTENTION\n");
retval = gif_get_extension (context);
if (retval == 0)
context->state = GIF_GET_NEXT_STEP;
break;
case GIF_GET_COLORMAP2:
- g_print ("in GIF_GET_COLORMAP2\n");
retval = gif_get_colormap (context);
if (retval == 0)
- context->state = GIF_PREPARE_LZW;
+ gif_set_prepare_lzw (context);
break;
case GIF_PREPARE_LZW:
- g_print ("in GIF_PREPARE_LZW\n");
retval = gif_prepare_lzw (context);
- if (retval == 0)
- context->state = GIF_GET_LZW;
break;
+ case GIF_LZW_FILL_BUFFER:
+ retval = gif_lzw_fill_buffer (context);
+ break;
+
case GIF_GET_LZW:
- g_print ("in GIF_GET_LZW\n");
- gif_get_lzw (context);
- retval = 0;
+ retval = gif_get_lzw (context);
break;
case GIF_DONE:
default:
- g_print ("in GIF_DONE\n");
retval = 0;
goto done;
};
- } while (retval == 0);
+ } while ((retval == 0) || (retval == -3));
done:
return retval;
}
g_return_val_if_fail (file != NULL, NULL);
context = g_new (GifContext, 1);
- context->lwz_fresh = FALSE;
context->file = file;
context->pixbuf = NULL;
context->state = GIF_START;
+ context->func = NULL;
gif_main_loop (context);
{
GifContext *context;
+ count = 0;
context = g_new (GifContext, 1);
context->func = func;
context->user_data = user_data;
- context->lwz_fresh = FALSE;
context->file = NULL;
context->pixbuf = NULL;
context->state = GIF_START;
-
+ context->buf = NULL;
+ context->amount_needed = 0;
return (gpointer) context;
}
if (context->pixbuf)
gdk_pixbuf_unref (context->pixbuf);
+// g_free (context->buf);
g_free (context);
}
gint retval;
GifContext *context = (GifContext *) data;
- return FALSE;
if (context->amount_needed == 0) {
/* we aren't looking for some bytes. */
+ /* we can use buf now, but we don't want to keep it around at all.
+ * it will be gone by the end of the call. */
context->buf = buf;
context->ptr = 0;
context->size = size;
- }
+ } else {
+ /* we need some bytes */
+ if (size < context->amount_needed) {
+ context->amount_needed -= size;
+ /* copy it over and return */
+ memcpy (context->buf + context->size, buf, size);
+ context->size += size;
+ return TRUE;
+ } else if (size == context->amount_needed) {
+ memcpy (context->buf + context->size, buf, size);
+ context->size += size;
+ } else {
+ context->buf = g_realloc (context->buf, context->size + size);
+ memcpy (context->buf + context->size, buf, size);
+ context->size += size;
+ }
+ }
+
retval = gif_main_loop (context);
- if (retval == 1)
+
+ if (retval == -2)
return FALSE;
if (retval == -1) {
+ /* we didn't have enough memory */
+ /* prepare for the next image_load_increment */
+ if (context->buf == buf) {
+ g_assert (context->size == size);
+ context->buf = (guchar *)g_new (guchar, context->amount_needed + (context->size - context->ptr));
+ memcpy (context->buf, buf + context->ptr, context->size - context->ptr);
+ } else {
+ /* copy the left overs to the begining of the buffer */
+ /* and realloc the memory */
+ memcpy (context->buf, context->buf, context->size - context->ptr);
+ context->buf = g_realloc (context->buf, context->amount_needed + (context->size - context->ptr));
+ }
+ context->size = context->size - context->ptr;
+ context->ptr = 0;
+ } else {
+ /* we are prolly all done */
+ if (context->buf == buf)
+ context->buf = NULL;
}
return TRUE;
}
projects / gtk4.git / commitdiff