mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-11-05 16:20:10 +00:00
lots of lots of work. USE AT YOUR OWN RISK
This commit is contained in:
Jonathan Blandford
parent
c3b9b0f7f4
commit
5dcc2ddd51
@ -51,6 +51,19 @@
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typedef unsigned char CMap[3][MAXCOLORMAPSIZE];
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/* Possible states we can be in. */
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enum {
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GIF_START = 1,
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GIF_GET_COLORMAP = 2,
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GIF_GET_NEXT_STEP = 3,
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GIF_GET_EXTENTION = 4,
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GIF_GET_COLORMAP2 = 5,
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GIF_PREPARE_LZW = 6,
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GIF_GET_LZW = 7,
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GIF_DONE = 8
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};
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typedef struct _Gif89 Gif89;
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struct _Gif89
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{
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@ -63,6 +76,7 @@ struct _Gif89
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typedef struct _GifContext GifContext;
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struct _GifContext
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{
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int state; /* really only relevant for progressive loading */
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unsigned int width;
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unsigned int height;
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CMap color_map;
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@ -73,7 +87,6 @@ struct _GifContext
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int gray_scale;
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GdkPixbuf *pixbuf;
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Gif89 gif89;
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gint stage;
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/* stuff per frame. As we only support the first one, not so
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* relevant. But still needed */
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@ -90,128 +103,233 @@ struct _GifContext
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guchar *buf;
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guint ptr;
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guint size;
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guint amount_needed;
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/* our colormap context */
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gint colormap_index;
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gint colormap_flag;
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/* our extension context */
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guchar extension_label;
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guchar extension_flag;
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/* get block context */
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guchar block_count;
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guchar block_buf[256];
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gint block_ptr;
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/* our lwz context */
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int lwz_fresh;
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int lwz_code_size;
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int lwz_set_code_size;
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int lwz_max_code;
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int lwz_max_code_size;
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int lwz_firstcode;
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int lwz_oldcode;
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int lwz_clear_code;
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int lwz_end_code;
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int lwz_table[2][(1 << MAX_LWZ_BITS)];
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int lwz_stack[(1 << (MAX_LWZ_BITS)) * 2];
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int *lwz_sp;
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gint lwz_fresh;
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gint lwz_code_size;
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guchar lwz_set_code_size;
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gint lwz_max_code;
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gint lwz_max_code_size;
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gint lwz_firstcode;
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gint lwz_oldcode;
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gint lwz_clear_code;
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gint lwz_end_code;
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gint lwz_table[2][(1 << MAX_LWZ_BITS)];
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gint lwz_stack[(1 << (MAX_LWZ_BITS)) * 2];
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gint *lwz_sp;
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};
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static int ReadColorMap (GifContext *, int, CMap, int *);
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static int DoExtension (GifContext *, int label);
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static int GetDataBlock (GifContext *, unsigned char *);
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static int GetCode (GifContext *, int, int);
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static int LWZReadByte (GifContext *, int, int);
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static void ReadImage (GifContext *context);
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static int LWZReadByte (GifContext *);
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static int
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ReadOK (GifContext *context, guchar *buffer, size_t len)
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{
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static int count = 0;
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count += len;
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g_print ("size :%d\tcount :%d\n", len, count);
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if (context->file)
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return fread(buffer, len, 1, context->file) != 0;
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else {
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if ((context->size - context->ptr) < len) {
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memcpy (buffer, context->buf + context->ptr, len);
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context->ptr += len;
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context->amount_needed = 0;
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return 0;
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}
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context->amount_needed = len - (context->size - context->ptr);
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}
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return 1;
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}
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/*
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* Return vals.
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*
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* for the gif_get* functions,
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*-1 -> more bytes needed.
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* 0 -> success
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* 1 -> failure; abort the load
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*/
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/* Changes the stage to be GIF_GET_COLORMAP */
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static void
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gif_set_get_colormap (GifContext *context)
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{
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context->colormap_flag = TRUE;
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context->colormap_index = 0;
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context->state = GIF_GET_COLORMAP;
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}
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static void
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gif_set_get_colormap2 (GifContext *context)
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{
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context->colormap_flag = TRUE;
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context->colormap_index = 0;
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context->state = GIF_GET_COLORMAP2;
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}
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static gint
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gif_get_colormap (GifContext *context)
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{
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unsigned char rgb[3];
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while (context->colormap_index < context->bit_pixel) {
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if (!ReadOK (context, rgb, sizeof (rgb))) {
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/*g_message (_("GIF: bad colormap\n"));*/
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return -1;
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}
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context->color_map[CM_RED][context->colormap_index] = rgb[0];
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context->color_map[CM_GREEN][context->colormap_index] = rgb[1];
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context->color_map[CM_BLUE][context->colormap_index] = rgb[2];
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context->colormap_flag &= (rgb[0] == rgb[1] && rgb[1] == rgb[2]);
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context->colormap_index ++;
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}
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context->gray_scale = (context->colormap_flag) ? GRAYSCALE : COLOR;
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return 0;
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}
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/*
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* in order for this function to work, we need to perform some black magic.
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* We want to return -1 to let the calling function know, as before, that it needs
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* more bytes. If we return 0, we were able to successfully read all block->count bytes.
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* Problem is, we don't want to reread block_count every time, so we check to see if
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* context->block_count is 0 before we read in the function.
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*
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* As a result, context->block_count MUST be 0 the first time the get_data_block is called
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* within a context.
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*/
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static int
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ReadColorMap (GifContext *context,
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int number,
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CMap buffer,
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int *format)
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get_data_block (GifContext *context,
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unsigned char *buf,
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gint *empty_block)
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{
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int i;
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unsigned char rgb[3];
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int flag;
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flag = TRUE;
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for (i = 0; i < number; ++i) {
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if (!ReadOK (context, rgb, sizeof (rgb))) {
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/*g_message (_("GIF: bad colormap\n"));*/
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return TRUE;
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if (context->block_count == 0) {
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if (!ReadOK (context, &context->block_count, 1)) {
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return -1;
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}
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buffer[CM_RED][i] = rgb[0];
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buffer[CM_GREEN][i] = rgb[1];
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buffer[CM_BLUE][i] = rgb[2];
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flag &= (rgb[0] == rgb[1] && rgb[1] == rgb[2]);
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}
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*format = (flag) ? GRAYSCALE : COLOR;
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if (context->block_count == 0)
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if (empty_block)
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*empty_block = TRUE;
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return FALSE;
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return 0;
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if (!ReadOK (context, buf, context->block_count)) {
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return -1;
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}
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return 0;
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}
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static void
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gif_set_get_extension (GifContext *context)
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{
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g_print ("getting the extension woooooo\n");
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context->state = GIF_GET_EXTENTION;
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context->extension_flag = TRUE;
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context->extension_label = '\000';
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context->block_count = 0;
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context->block_ptr = 0;
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}
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static int
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DoExtension (GifContext *context, int label)
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gif_get_extension (GifContext *context)
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{
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static guchar buf[256];
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gint retval;
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gint empty_block = FALSE;
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switch (label) {
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case 0xf9: /* Graphic Control Extension */
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(void) GetDataBlock (context, (unsigned char *) buf);
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context->gif89.disposal = (buf[0] >> 2) & 0x7;
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context->gif89.input_flag = (buf[0] >> 1) & 0x1;
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context->gif89.delay_time = LM_to_uint (buf[1], buf[2]);
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if (context->pixbuf == NULL) {
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/* I only want to set the transparency if I haven't
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* created the pixbuf yet. */
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if ((buf[0] & 0x1) != 0)
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context->gif89.transparent = buf[3];
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else
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context->gif89.transparent = -1;
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g_print ("in gif_get_extension\n");
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if (context->extension_flag) {
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if (!context->extension_label) {
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if (!ReadOK (context, &context->extension_label , 1)) {
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return -1;
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}
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}
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switch (context->extension_label) {
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case 0xf9: /* Graphic Control Extension */
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retval = get_data_block (context, (unsigned char *) context->block_buf, NULL);
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if (retval != 0)
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return retval;
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context->gif89.disposal = (context->block_buf[0] >> 2) & 0x7;
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context->gif89.input_flag = (context->block_buf[0] >> 1) & 0x1;
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context->gif89.delay_time = LM_to_uint (context->block_buf[1], context->block_buf[2]);
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if (context->pixbuf == NULL) {
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/* I only want to set the transparency if I haven't
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* created the pixbuf yet. */
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if ((context->block_buf[0] & 0x1) != 0)
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context->gif89.transparent = context->block_buf[3];
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else
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context->gif89.transparent = -1;
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}
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/* Now we've successfully loaded this one, we continue on our way */
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context->extension_flag = FALSE;
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default:
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/* Unhandled extension */
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break;
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}
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while (GetDataBlock (context, (unsigned char *) buf) != 0)
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;
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return FALSE;
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break;
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default:
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/* Unhandled extension */
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break;
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}
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/* read all blocks, until I get an empty block */
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/* not sure why, but it makes it work. -jrb */
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do {
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retval = get_data_block (context, (unsigned char *) context->block_buf, &empty_block);
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if (retval != 0)
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return retval;
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} while (!empty_block);
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while (GetDataBlock (context, (unsigned char *) buf) != 0)
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;
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return FALSE;
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return 0;
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}
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static int ZeroDataBlock = FALSE;
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static int
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GetDataBlock (GifContext *context,
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GetDataBlock (GifContext *context,
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unsigned char *buf)
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{
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unsigned char count;
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// unsigned char count;
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if (!ReadOK (context, &count, 1)) {
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if (!ReadOK (context, &context->block_count, 1)) {
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/*g_message (_("GIF: error in getting DataBlock size\n"));*/
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return -1;
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}
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ZeroDataBlock = count == 0;
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ZeroDataBlock = context->block_count == 0;
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if ((count != 0) && (!ReadOK (context, buf, count))) {
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if ((context->block_count != 0) && (!ReadOK (context, buf, context->block_count))) {
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/*g_message (_("GIF: error in reading DataBlock\n"));*/
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return -1;
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}
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return count;
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return context->block_count;
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}
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static int
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GetCode (GifContext *context,
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int code_size,
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@ -258,36 +376,12 @@ GetCode (GifContext *context,
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}
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static int
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LWZReadByte (GifContext *context,
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int flag,
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int input_code_size)
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LWZReadByte (GifContext *context)
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{
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int code, incode;
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register int i;
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if (flag) {
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context->lwz_set_code_size = input_code_size;
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context->lwz_code_size = context->lwz_set_code_size + 1;
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context->lwz_clear_code = 1 << context->lwz_set_code_size;
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context->lwz_end_code = context->lwz_clear_code + 1;
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context->lwz_max_code_size = 2 * context->lwz_clear_code;
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context->lwz_max_code = context->lwz_clear_code + 2;
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GetCode (context, 0, TRUE);
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context->lwz_fresh = TRUE;
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for (i = 0; i < context->lwz_clear_code; ++i) {
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context->lwz_table[0][i] = 0;
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context->lwz_table[1][i] = i;
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}
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for (; i < (1 << MAX_LWZ_BITS); ++i)
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context->lwz_table[0][i] = context->lwz_table[1][0] = 0;
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context->lwz_sp = context->lwz_stack;
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return 0;
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} else if (context->lwz_fresh) {
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if (context->lwz_fresh) {
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context->lwz_fresh = FALSE;
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do {
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context->lwz_firstcode = context->lwz_oldcode = GetCode (context, context->lwz_code_size, FALSE);
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@ -367,26 +461,12 @@ LWZReadByte (GifContext *context,
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}
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static void
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ReadImage (GifContext *context)
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gif_get_lzw (GifContext *context)
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{
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guchar *dest, *temp;
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guchar c;
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gint xpos = 0, ypos = 0, pass = 0;
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gint v;
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/*
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** Initialize the Compression routines
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*/
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if (!ReadOK (context, &c, 1)) {
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/*g_message (_("GIF: EOF / read error on image data\n"));*/
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return;
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}
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if (LWZReadByte (context, TRUE, c) < 0) {
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/*g_message (_("GIF: error while reading\n"));*/
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return;
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}
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context->pixbuf = gdk_pixbuf_new (ART_PIX_RGB,
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context->gif89.transparent,
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8,
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@ -394,7 +474,7 @@ ReadImage (GifContext *context)
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context->height);
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dest = gdk_pixbuf_get_pixels (context->pixbuf);
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while ((v = LWZReadByte ( context, FALSE, c)) >= 0) {
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while ((v = LWZReadByte ( context)) >= 0) {
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if (context->gif89.transparent) {
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temp = dest + ypos * gdk_pixbuf_get_rowstride (context->pixbuf) + xpos * 4;
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*temp = context->color_map [0][(guchar) v];
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@ -438,7 +518,7 @@ ReadImage (GifContext *context)
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ypos = 1;
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break;
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default:
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goto fini;
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goto done;
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}
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}
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} else {
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@ -449,29 +529,52 @@ ReadImage (GifContext *context)
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break;
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}
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fini:
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ypos = 0;
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if (LWZReadByte (context, FALSE, c) >= 0)
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g_print ("GIF: too much input data, ignoring extra...\n");
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done:
|
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/* we got enough data. there may be more (ie, newer layers) but we can quit now */
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context->state = GIF_DONE;
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}
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|
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/* called until 1 is returned.
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* if -1 is returned, then there was an error, and we must stop loading the image
|
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* if 0 is returned, we need more bytes. However, this isn't handled correctly currently,
|
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* so we assume that the initial 128 bytes is enough to get us started.
|
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* If 1 is returned, then we are ready to start loading the image. */
|
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static int
|
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gif_prepare_lzw (GifContext *context)
|
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{
|
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gint i;
|
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|
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if (!ReadOK (context, &(context->lwz_set_code_size), 1)) {
|
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/*g_message (_("GIF: EOF / read error on image data\n"));*/
|
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return -1;
|
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}
|
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|
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context->lwz_code_size = context->lwz_set_code_size + 1;
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context->lwz_clear_code = 1 << context->lwz_set_code_size;
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context->lwz_end_code = context->lwz_clear_code + 1;
|
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context->lwz_max_code_size = 2 * context->lwz_clear_code;
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context->lwz_max_code = context->lwz_clear_code + 2;
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|
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GetCode (context, 0, TRUE);
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context->lwz_fresh = TRUE;
|
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|
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for (i = 0; i < context->lwz_clear_code; ++i) {
|
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context->lwz_table[0][i] = 0;
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context->lwz_table[1][i] = i;
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}
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for (; i < (1 << MAX_LWZ_BITS); ++i)
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context->lwz_table[0][i] = context->lwz_table[1][0] = 0;
|
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context->lwz_sp = context->lwz_stack;
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return 0;
|
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}
|
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|
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/* needs 13 bytes to proceed. */
|
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static gint
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prepare_iter_loop (GifContext *context)
|
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gif_init (GifContext *context)
|
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{
|
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unsigned char buf[16];
|
||||
unsigned char c;
|
||||
char version[4];
|
||||
|
||||
if (!ReadOK (context, buf, 6)) {
|
||||
/* Unable to read magic number */
|
||||
return 0;
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (strncmp ((char *) buf, "GIF", 3) != 0) {
|
||||
@ -490,7 +593,7 @@ prepare_iter_loop (GifContext *context)
|
||||
/* read the screen descriptor */
|
||||
if (!ReadOK (context, buf, 7)) {
|
||||
/* Failed to read screen descriptor */
|
||||
return 0;
|
||||
return -1;
|
||||
}
|
||||
|
||||
context->width = LM_to_uint (buf[0], buf[1]);
|
||||
@ -502,66 +605,135 @@ prepare_iter_loop (GifContext *context)
|
||||
context->pixbuf = NULL;
|
||||
|
||||
if (BitSet (buf[4], LOCALCOLORMAP)) {
|
||||
/* Global Colormap */
|
||||
if (ReadColorMap (context, context->bit_pixel,
|
||||
context->color_map,
|
||||
&context->gray_scale)) {
|
||||
return -1;
|
||||
}
|
||||
gif_set_get_colormap (context);
|
||||
} else {
|
||||
context->state = GIF_GET_NEXT_STEP;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
context->stage = 1;
|
||||
|
||||
static gint
|
||||
gif_get_next_step (GifContext *context)
|
||||
{
|
||||
unsigned char buf[16];
|
||||
unsigned char c;
|
||||
for (;;) {
|
||||
if (!ReadOK (context, &c, 1)) {
|
||||
return 0;
|
||||
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? */
|
||||
return -1;
|
||||
context->state = GIF_DONE;
|
||||
return 1;
|
||||
}
|
||||
|
||||
if (c == '!') {
|
||||
/* Check the extention */
|
||||
if (!ReadOK (context, &c, 1)) {
|
||||
return 0;
|
||||
}
|
||||
DoExtension (context, c);
|
||||
/* Check the extention */
|
||||
gif_set_get_extension (context);
|
||||
continue;
|
||||
}
|
||||
|
||||
/* look for frame */
|
||||
if (c != ',') {
|
||||
/* Not a valid start character */
|
||||
/* Not a valid start character */
|
||||
continue;
|
||||
}
|
||||
|
||||
if (!ReadOK (context, buf, 9)) {
|
||||
return 0;
|
||||
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)
|
||||
return -1;
|
||||
if (context->frame_height > context->height) {
|
||||
context->state = GIF_DONE;
|
||||
return 1;
|
||||
}
|
||||
|
||||
context->frame_interlace = BitSet (buf[8], INTERLACE);
|
||||
if (!BitSet (buf[8], LOCALCOLORMAP)) {
|
||||
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);
|
||||
if (ReadColorMap (context, context->bit_pixel, context->color_map, &context->gray_scale)) {
|
||||
return -1;
|
||||
}
|
||||
gif_set_get_colormap2 (context);
|
||||
return 0;
|
||||
}
|
||||
return 1;
|
||||
context->state = GIF_PREPARE_LZW;
|
||||
return 0;
|
||||
}
|
||||
g_assert_not_reached ();
|
||||
return -1;
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
static gint
|
||||
gif_main_loop (GifContext *context)
|
||||
{
|
||||
gint retval = 0;
|
||||
|
||||
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_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;
|
||||
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_GET_LZW:
|
||||
g_print ("in GIF_GET_LZW\n");
|
||||
gif_get_lzw (context);
|
||||
retval = 0;
|
||||
break;
|
||||
|
||||
case GIF_DONE:
|
||||
default:
|
||||
g_print ("in GIF_DONE\n");
|
||||
retval = 0;
|
||||
goto done;
|
||||
};
|
||||
} while (retval == 0);
|
||||
done:
|
||||
return retval;
|
||||
}
|
||||
|
||||
/* Shared library entry point */
|
||||
@ -576,10 +748,10 @@ image_load (FILE *file)
|
||||
context->lwz_fresh = FALSE;
|
||||
context->file = file;
|
||||
context->pixbuf = NULL;
|
||||
context->stage = 0;
|
||||
context->state = GIF_START;
|
||||
|
||||
gif_main_loop (context);
|
||||
|
||||
prepare_iter_loop (context);
|
||||
ReadImage (context);
|
||||
return context->pixbuf;
|
||||
}
|
||||
|
||||
@ -594,7 +766,7 @@ image_begin_load (ModulePreparedNotifyFunc func, gpointer user_data)
|
||||
context->lwz_fresh = FALSE;
|
||||
context->file = NULL;
|
||||
context->pixbuf = NULL;
|
||||
context->stage = 0;
|
||||
context->state = GIF_START;
|
||||
|
||||
return (gpointer) context;
|
||||
}
|
||||
@ -612,7 +784,20 @@ image_stop_load (gpointer data)
|
||||
gboolean
|
||||
image_load_increment (gpointer data, guchar *buf, guint size)
|
||||
{
|
||||
gint retval;
|
||||
GifContext *context = (GifContext *) data;
|
||||
|
||||
return FALSE;
|
||||
if (context->amount_needed == 0) {
|
||||
/* we aren't looking for some bytes. */
|
||||
context->buf = buf;
|
||||
context->ptr = 0;
|
||||
context->size = size;
|
||||
}
|
||||
retval = gif_main_loop (context);
|
||||
if (retval == 1)
|
||||
return FALSE;
|
||||
if (retval == -1) {
|
||||
}
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user