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ext/libpng/gstpngdec.c: Implement paletted and grayscale png files handling. (#150363).

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Original commit message from CVS:
2006-03-06  Julien MOUTTE  <julien@moutte.net>

* ext/libpng/gstpngdec.c: (gst_pngdec_caps_create_and_set):
Implement paletted and grayscale png files handling.
(#150363).
This commit is contained in:
Julien Moutte 2006-03-06 22:22:45 +00:00
parent 655c7fcb2e
commit f50d6d8014
2 changed files with 30 additions and 5 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2006-03-06 Julien MOUTTE <julien@moutte.net>
* ext/libpng/gstpngdec.c: (gst_pngdec_caps_create_and_set):
Implement paletted and grayscale png files handling.
(#150363).
2006-03-06 Thomas Vander Stichele <thomas at apestaart dot org>
* ext/speex/gstspeexenc.c: (gst_speexenc_set_header_on_caps),

29
ext/libpng/gstpngdec.c
View file

@ -294,7 +294,8 @@ gst_pngdec_caps_create_and_set (GstPngDec * pngdec)
/* We don't handle 16 bits per color, strip down to 8 */
if (bpc == 16) {
GST_LOG ("this is a 16 bits per channel PNG image, strip down to 8 bits");
GST_LOG_OBJECT (pngdec,
"this is a 16 bits per channel PNG image, strip down to 8 bits");
png_set_strip_16 (pngdec->png);
}
@ -305,6 +306,23 @@ gst_pngdec_caps_create_and_set (GstPngDec * pngdec)
if (color_type == PNG_COLOR_TYPE_RGB_ALPHA)
png_set_bgr (pngdec->png);
/* Gray scale converted to RGB and upscaled to 8 bits */
if ((color_type == PNG_COLOR_TYPE_GRAY_ALPHA) ||
(color_type == PNG_COLOR_TYPE_GRAY)) {
GST_LOG_OBJECT (pngdec, "converting grayscale png to RGB");
png_set_gray_to_rgb (pngdec->png);
if (bpc < 8) { /* Convert to 8 bits */
GST_LOG_OBJECT (pngdec, "converting grayscale image to 8 bits");
png_set_gray_1_2_4_to_8 (pngdec->png);
}
}
/* Palette converted to RGB */
if (color_type == PNG_COLOR_TYPE_PALETTE) {
GST_LOG_OBJECT (pngdec, "converting palette png to RGB");
png_set_palette_to_rgb (pngdec->png);
}
/* Update the info structure */
png_read_update_info (pngdec->png, pngdec->info);
@ -316,20 +334,21 @@ gst_pngdec_caps_create_and_set (GstPngDec * pngdec)
pngdec->width = width;
pngdec->height = height;
GST_LOG ("this is a %dx%d PNG image", pngdec->width, pngdec->height);
GST_LOG_OBJECT (pngdec, "this is a %dx%d PNG image", pngdec->width,
pngdec->height);
switch (pngdec->color_type) {
case PNG_COLOR_TYPE_RGB:
GST_LOG ("we have no alpha channel, depth is 24 bits");
GST_LOG_OBJECT (pngdec, "we have no alpha channel, depth is 24 bits");
pngdec->bpp = 24;
break;
case PNG_COLOR_TYPE_RGB_ALPHA:
GST_LOG ("we have an alpha channel, depth is 32 bits");
GST_LOG_OBJECT (pngdec, "we have an alpha channel, depth is 32 bits");
pngdec->bpp = 32;
break;
default:
GST_ELEMENT_ERROR (pngdec, STREAM, NOT_IMPLEMENTED, (NULL),
("pngdec does not support grayscale or paletted data yet"));
("pngdec does not support this color type"));
ret = GST_FLOW_ERROR;
goto beach;
}