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wrlib: Added support for webp image

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This patch is adding support for google webp image format, if you
don't know it a quick recap is to say that according to their tests
they claim it is better than png and jpeg.

Follow the link below for some more details:
https://developers.google.com/speed/webp/

Signed-off-by: Carlos R. Mafra <crmafra@gmail.com>
This commit is contained in:
David Maciejak
2014-04-05 22:51:03 +02:00
committed by Carlos R. Mafra
parent de1421394c
commit 050cae3bd2
6 changed files with 207 additions and 2 deletions
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24
wrlib/load.c
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@@ -3,6 +3,7 @@
* Raster graphics library
*
* Copyright (c) 1997-2003 Alfredo K. Kojima
* Copyright (c) 2014 Window Maker Team
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
@@ -93,6 +94,9 @@ char **RSupportedFileFormats(void)
#endif
#ifdef USE_GIF
tmp[i++] = "GIF";
#endif
#ifdef USE_WEBP
tmp[i++] = "WEBP";
#endif
tmp[i] = NULL;
@@ -192,6 +196,12 @@ RImage *RLoadImage(RContext * context, const char *file, int index)
break;
#endif /* USE_GIF */
#ifdef USE_WEBP
case IM_WEBP:
image = RLoadWEBP(file);
break;
#endif /* USE_WEBP */
case IM_PPM:
image = RLoadPPM(file);
break;
@@ -266,6 +276,11 @@ char *RGetImageFileFormat(const char *file)
return "GIF";
#endif /* USE_GIF */
#ifdef USE_WEBP
case IM_WEBP:
return "WEBP";
#endif /* USE_WEBP */
case IM_PPM:
return "PPM";
@@ -329,5 +344,14 @@ static WRImgFormat identFile(const char *path)
(buffer[4] == '7' || buffer[4] == '9') && buffer[5] == 'a')
return IM_GIF;
/* check for WEBP */
if (buffer[ 0] == 'R' && buffer[ 1] == 'I' && buffer[ 2] == 'F' && buffer[ 3] == 'F' &&
buffer[ 8] == 'W' && buffer[ 9] == 'E' && buffer[10] == 'B' && buffer[11] == 'P' &&
buffer[12] == 'V' && buffer[13] == 'P' && buffer[14] == '8' &&
(buffer[15] == ' ' /* Simple File Format (Lossy) */
|| buffer[15] == 'L' /* Simple File Format (Lossless) */
|| buffer[15] == 'X')) /* Extended File Format */
return IM_WEBP;
return IM_UNKNOWN;
}