* Copyright (C) 1999 Mark Crichton
* Copyright (C) 1999 The Free Software Foundation
*
- * Authors: Mark Crichton <crichton@gimp.org>
- * Federico Mena-Quintero <federico@gimp.org>
+ * Authors: Jonathan Blandford <jrb@redhat.com>
+ * Adapted from the gimp gif filter written by Adam Moss <adam@gimp.org>
+ * Gimp work based on earlier work by ......
+ * Permission to relicense under the LGPL obtained.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
unsigned int aspect_ratio;
int gray_scale;
GdkPixbuf *pixbuf;
+ guchar used_cmap[3][256];
Gif89 gif89;
};
int showComment = TRUE;
char *globalcomment = NULL;
gint globalusecomment = TRUE;
-static guchar highest_used_index;
static int ReadColorMap (FILE *, int, CMap, int *);
static int DoExtension (FILE *file, GifContext *context, int label);
static int GetDataBlock (FILE *, unsigned char *);
static int GetCode (FILE *, int, int);
static int LWZReadByte (FILE *, int, int);
-static gint32 ReadImage (FILE *, char *, int, int, CMap, int, int, int, int,
- guint, guint, guint, guint);
+static void ReadImage (FILE *file,
+ GifContext *context,
+ int len,
+ int height,
+ CMap cmap,
+ int ncols,
+ int format,
+ int interlace,
+ int number,
+ guint leftpos,
+ guint toppos);
static int
ReadColorMap (FILE *file,
context->gif89.disposal = (buf[0] >> 2) & 0x7;
context->gif89.input_flag = (buf[0] >> 1) & 0x1;
context->gif89.delay_time = LM_to_uint (buf[1], buf[2]);
- if ((buf[0] & 0x1) != 0)
- context->gif89.transparent = buf[3];
- else
- context->gif89.transparent = -1;
+ if (context->pixbuf == NULL) {
+ /* I only want to set the transparency if I haven't
+ * created the pixbuf yet. */
+ if ((buf[0] & 0x1) != 0)
+ context->gif89.transparent = buf[3];
+ else
+ context->gif89.transparent = -1;
+ }
while (GetDataBlock (file, (unsigned char *) buf) != 0)
;
return FALSE;
return code;
}
-#if 0
-static gint32
+static void
ReadImage (FILE *file,
- char *filename,
+ GifContext *context,
int len,
int height,
CMap cmap,
int interlace,
int number,
guint leftpos,
- guint toppos,
- guint screenwidth,
- guint screenheight)
+ guint toppos)
{
- static gint32 image_ID;
-
- gint32 layer_ID;
- GPixelRgn pixel_rgn;
- GDrawable *drawable;
guchar *dest, *temp;
guchar c;
gint xpos = 0, ypos = 0, pass = 0;
- gint cur_progress, max_progress;
gint v;
gint i, j;
- gboolean alpha_frame = FALSE;
- int nreturn_vals;
- static int previous_disposal;
/*
** Initialize the Compression routines
*/
if (!ReadOK (file, &c, 1)) {
/*g_message (_("GIF: EOF / read error on image data\n"));*/
- return -1;
+ return;
}
if (LWZReadByte (file, TRUE, c) < 0) {
/*g_message (_("GIF: error while reading\n"));*/
- return -1;
+ return;
}
- if (frame_number == 1 ) {
- image_ID = gimp_image_new (screenwidth, screenheight, INDEXED);
- gimp_image_set_filename (image_ID, filename);
-
- for (i = 0, j = 0; i < ncols; i++) {
- used_cmap[0][i] = gimp_cmap[j++] = cmap[0][i];
- used_cmap[1][i] = gimp_cmap[j++] = cmap[1][i];
- used_cmap[2][i] = gimp_cmap[j++] = cmap[2][i];
- }
-
- gimp_image_set_cmap (image_ID, gimp_cmap, ncols);
-
- if (Gif89.delayTime < 0)
- strcpy(framename, _("Background"));
- else
- sprintf(framename, _("Background (%dms)"), 10*Gif89.delayTime);
+ context->pixbuf = gdk_pixbuf_new (ART_PIX_RGB,
+ context->gif89.transparent,
+ 8,
+ context->width,
+ context->height);
- previous_disposal = Gif89.disposal;
-
- if (Gif89.transparent == -1) {
- layer_ID = gimp_layer_new (image_ID, framename,
- len, height,
- INDEXED_IMAGE, 100, NORMAL_MODE);
- } else {
- layer_ID = gimp_layer_new (image_ID, framename,
- len, height,
- INDEXEDA_IMAGE, 100, NORMAL_MODE);
- alpha_frame=TRUE;
- }
- }
-#if 0
- else {
- /* NOT FIRST FRAME */
- /* If the colourmap is now different, we have to promote to
- RGB! */
- if (!promote_to_rgb) {
- for (i=0;i<ncols;i++) {
- if ((used_cmap[0][i] != cmap[0][i]) ||
- (used_cmap[1][i] != cmap[1][i]) ||
- (used_cmap[2][i] != cmap[2][i])) {
- /* Everything is RGB(A) from now on... sigh. */
- promote_to_rgb = TRUE;
-
- /* Promote everything we have so far into RGB(A) */
- gimp_run_procedure("gimp_convert_rgb", &nreturn_vals,
- PARAM_IMAGE, image_ID,
- PARAM_END);
- break;
- }
- }
- }
-
- if (Gif89.delayTime < 0)
- sprintf(framename, _("Frame %d"), frame_number);
- else
- sprintf(framename, _("Frame %d (%dms)"),
- frame_number, 10*Gif89.delayTime);
-
- switch (previous_disposal) {
- case 0x00: break; /* 'don't care' */
- case 0x01: strcat(framename,_(" (combine)")); break;
- case 0x02: strcat(framename,_(" (replace)")); break;
- case 0x03: strcat(framename,_(" (combine)")); break;
- case 0x04:
- case 0x05:
- case 0x06:
- case 0x07:
- strcat(framename,_(" (unknown disposal)"));
- g_message (_("GIF: Hmm... please forward this GIF to the "
- "GIF plugin author!\n (adam@foxbox.org)\n"));
- break;
- default: g_message (_("GIF: Something got corrupted.\n")); break;
- }
-
- previous_disposal = Gif89.disposal;
-
- layer_ID = gimp_layer_new (image_ID, framename,
- len, height,
- promote_to_rgb ? RGBA_IMAGE : INDEXEDA_IMAGE,
- 100, NORMAL_MODE);
- alpha_frame = TRUE;
- }
-
- frame_number++;
-#endif
- gimp_image_add_layer (image_ID, layer_ID, 0);
- gimp_layer_translate (layer_ID, (gint)leftpos, (gint)toppos);
-
- drawable = gimp_drawable_get (layer_ID);
-
- cur_progress = 0;
- max_progress = height;
-
- if (alpha_frame)
- dest = (guchar *) g_malloc (len * height *
- (promote_to_rgb ? 4 : 2));
- else
- dest = (guchar *) g_malloc (len * height);
-
- if (verbose)
- g_print (_("GIF: reading %d by %d%s GIF image, ncols=%d\n"),
- len, height, interlace ? _(" interlaced") : "", ncols);
-
- if (!alpha_frame && promote_to_rgb) {
- g_message (_("GIF: Ouchie! Can't handle non-alpha RGB frames.\n Please mail the plugin author. (adam@gimp.org)\n"));
- exit(-1);
+ for (i = 0, j = 0; i < ncols; i++) {
+ context->used_cmap[0][i] = cmap[0][i];
+ context->used_cmap[1][i] = cmap[1][i];
+ context->used_cmap[2][i] = cmap[2][i];
}
+ dest = gdk_pixbuf_get_pixels (context->pixbuf);
while ((v = LWZReadByte (file, FALSE, c)) >= 0) {
- if (alpha_frame) {
- if (((guchar)v > highest_used_index) && !(v == Gif89.transparent))
- highest_used_index = (guchar)v;
- if (promote_to_rgb) {
- temp = dest + ( (ypos * len) + xpos ) * 4;
- *(temp ) = (guchar) cmap[0][v];
- *(temp+1) = (guchar) cmap[1][v];
- *(temp+2) = (guchar) cmap[2][v];
- *(temp+3) = (guchar) ((v == Gif89.transparent) ? 0 : 255);
- } else {
- temp = dest + ( (ypos * len) + xpos ) * 2;
- *temp = (guchar) v;
- *(temp+1) = (guchar) ((v == Gif89.transparent) ? 0 : 255);
- }
+ if (context->gif89.transparent) {
+ temp = dest + ( (ypos * len) + xpos ) * 2;
+ *temp = (guchar) v;
+ *(temp+1) = (guchar) ((v == context->gif89.transparent) ? 0 : 255);
} else {
- if ((guchar)v > highest_used_index)
- highest_used_index = (guchar)v;
temp = dest + (ypos * len) + xpos;
*temp = (guchar) v;
} else {
ypos++;
}
-
- if (run_mode != RUN_NONINTERACTIVE) {
- cur_progress++;
- if ((cur_progress % 16) == 0)
- gimp_progress_update ((double) cur_progress / (double) max_progress);
- }
}
if (ypos >= height)
break;
fini:
if (LWZReadByte (file, FALSE, c) >= 0)
- g_print (_("GIF: too much input data, ignoring extra...\n"));
-
- gimp_pixel_rgn_init (&pixel_rgn, drawable, 0, 0, drawable->width, drawable->height, TRUE, FALSE);
- gimp_pixel_rgn_set_rect (&pixel_rgn, dest, 0, 0, drawable->width, drawable->height);
-
- g_free (dest);
-
- gimp_drawable_flush (drawable);
- gimp_drawable_detach (drawable);
-
- return image_ID;
+ g_print ("GIF: too much input data, ignoring extra...\n");
}
-#endif
/* Shared library entry point */
GdkPixbuf *
/*g_message (_("GIF: warning - non-square pixels\n"));*/
}
- highest_used_index = 0;
-
for (;;) {
if (!ReadOK (file, &c, 1)) {
/*g_message (_("GIF: EOF / read error on image data\n"));*/
bitPixel = 1 << ((buf[8] & 0x07) + 1);
-#if 0
if (!useGlobalColormap) {
- if (ReadColorMap (file, bitPixel, localColorMap, &grayScale)) {
+ if (ReadColorMap (file, bitPixel, localColorMap, &context->gray_scale)) {
/*g_message (_("GIF: error reading local colormap\n"));*/
- return image_ID; /* will be -1 if failed on first image! */
+ return context->pixbuf; /* will be -1 if failed on first image! */
}
- image_ID = ReadImage (file, filename, LM_to_uint (buf[4], buf[5]),
- LM_to_uint (buf[6], buf[7]),
- localColorMap, bitPixel,
- grayScale,
- BitSet (buf[8], INTERLACE), imageCount,
- (guint) LM_to_uint (buf[0], buf[1]),
- (guint) LM_to_uint (buf[2], buf[3]),
- GifScreen.Width,
- GifScreen.Height);
+ ReadImage (file, context, LM_to_uint (buf[4], buf[5]),
+ LM_to_uint (buf[6], buf[7]),
+ localColorMap, bitPixel,
+ context->gray_scale,
+ BitSet (buf[8], INTERLACE), imageCount,
+ (guint) LM_to_uint (buf[0], buf[1]),
+ (guint) LM_to_uint (buf[2], buf[3]));
} else {
- image_ID = ReadImage (file, filename, LM_to_uint (buf[4], buf[5]),
- LM_to_uint (buf[6], buf[7]),
- GifScreen.ColorMap, GifScreen.BitPixel,
- GifScreen.GrayScale,
- BitSet (buf[8], INTERLACE), imageCount,
- (guint) LM_to_uint (buf[0], buf[1]),
- (guint) LM_to_uint (buf[2], buf[3]),
- GifScreen.Width,
- GifScreen.Height);
+ ReadImage (file, context, LM_to_uint (buf[4], buf[5]),
+ LM_to_uint (buf[6], buf[7]),
+ context->color_map, context->bit_pixel,
+ context->gray_scale,
+ BitSet (buf[8], INTERLACE), imageCount,
+ (guint) LM_to_uint (buf[0], buf[1]),
+ (guint) LM_to_uint (buf[2], buf[3]));
}
-#endif
}
return context->pixbuf;
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