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apps: common: dng_writer: Fix thumbnail generation on BE machines

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The 16-bit padded raw 10 and raw 12 formats are stored in memory in
little endian order, regardless of the machine's endianness. Swap the
16-bit values on big-endian machines when reading pixels from memory to
generate thumbnails.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Stefan Klug <stefan.klug@ideasonboard.com>
This commit is contained in:
Laurent Pinchart 2024-06-28 23:59:30 +03:00
parent 7e3a351a29
commit 7735d65ce8
1 changed files with 3 additions and 1 deletions
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4
src/apps/common/dng_writer.cpp
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@ -8,6 +8,7 @@
#include "dng_writer.h"
#include <algorithm>
#include <endian.h>
#include <iostream>
#include <map>
@ -185,7 +186,8 @@ void thumbScanlineRaw(const FormatInfo &info, void *output, const void *input,
/* Simple averaging that produces greyscale RGB values. */
for (unsigned int x = 0; x < width; x++) {
uint16_t value = (in[0] + in[1] + in2[0] + in2[1]) >> 2;
uint16_t value = (le16toh(in[0]) + le16toh(in[1]) +
le16toh(in2[0]) + le16toh(in2[1])) >> 2;
value = value >> shift;
*out++ = value;
*out++ = value;