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imageviewer: gif viewer based on giflib-5.0.2

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This adds ability to view gif images in rockbox.
Works both on color and gray/monochrome targets (greylib).
Aspect correction is supported as well.

Limitations:
- animated gifs are restricted to 32 frames
- animated gifs loop always (loopcount is ignored)
- plain text extension is not supported
- animated gifs with interframe delay = 0 are treated as still
  images (web browsers usually treat delay 0 as 100ms to prevent
  exhaustive CPU load by such images)

Change-Id: I61501f801ddcd403410e38d83e6bddc9883e7ede
This commit is contained in:
Marcin Bukat 2012-11-02 13:03:58 +01:00
parent b35f82c91f
commit 0ceaff2b65
23 changed files with 3006 additions and 15 deletions
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99
apps/plugins/imageviewer/gif/gif_err.c Normal file
View file

@ -0,0 +1,99 @@
/*****************************************************************************
gif_err.c - handle error reporting for the GIF library.
****************************************************************************/
/* #include <stdio.h> */
#include "gif_lib.h"
#include "gif_lib_private.h"
/*****************************************************************************
Return a string description of the last GIF error
*****************************************************************************/
char *
GifErrorString(int ErrorCode)
{
char *Err;
switch (ErrorCode) {
#if 0
case E_GIF_ERR_OPEN_FAILED:
Err = "Failed to open given file";
break;
case E_GIF_ERR_WRITE_FAILED:
Err = "Failed to write to given file";
break;
case E_GIF_ERR_HAS_SCRN_DSCR:
Err = "Screen descriptor has already been set";
break;
case E_GIF_ERR_HAS_IMAG_DSCR:
Err = "Image descriptor is still active";
break;
case E_GIF_ERR_NO_COLOR_MAP:
Err = "Neither global nor local color map";
break;
case E_GIF_ERR_DATA_TOO_BIG:
Err = "Number of pixels bigger than width * height";
break;
case E_GIF_ERR_NOT_ENOUGH_MEM:
Err = "Failed to allocate required memory";
break;
case E_GIF_ERR_DISK_IS_FULL:
Err = "Write failed (disk full?)";
break;
case E_GIF_ERR_CLOSE_FAILED:
Err = "Failed to close given file";
break;
case E_GIF_ERR_NOT_WRITEABLE:
Err = "Given file was not opened for write";
break;
#endif
case D_GIF_ERR_OPEN_FAILED:
Err = "Failed to open given file";
break;
case D_GIF_ERR_READ_FAILED:
Err = "Failed to read from given file";
break;
case D_GIF_ERR_NOT_GIF_FILE:
Err = "Data is not in GIF format";
break;
case D_GIF_ERR_NO_SCRN_DSCR:
Err = "No screen descriptor detected";
break;
case D_GIF_ERR_NO_IMAG_DSCR:
Err = "No Image Descriptor detected";
break;
case D_GIF_ERR_NO_COLOR_MAP:
Err = "Neither global nor local color map";
break;
case D_GIF_ERR_WRONG_RECORD:
Err = "Wrong record type detected";
break;
case D_GIF_ERR_DATA_TOO_BIG:
Err = "Number of pixels bigger than width * height";
break;
case D_GIF_ERR_NOT_ENOUGH_MEM:
Err = "Failed to allocate required memory";
break;
case D_GIF_ERR_CLOSE_FAILED:
Err = "Failed to close given file";
break;
case D_GIF_ERR_NOT_READABLE:
Err = "Given file was not opened for read";
break;
case D_GIF_ERR_IMAGE_DEFECT:
Err = "Image is defective, decoding aborted";
break;
case D_GIF_ERR_EOF_TOO_SOON:
Err = "Image EOF detected before image complete";
break;
default:
Err = NULL;
break;
}
return Err;
}
/* end */