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apps: common: dng_writer: Add thumbnail scanline function for Raw

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Add a thumbnail function for raw formats that are 16bit aligned.
This is needed for the upcoming RAW10 and RAW12 implemntation.

Use the new function for RAW16 as the thumbScanlineRaw_CSI2P produces
incorrect results for that format (it averages over adjacent bytes,
which works for the CSI formats).

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Stefan Klug 2024-06-28 12:01:44 +02:00 • committed by Laurent Pinchart
parent a47ab2711d
commit 4513db58c0
1 changed files with 27 additions and 4 deletions
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31
src/apps/common/dng_writer.cpp
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@ -144,6 +144,29 @@ void packScanlineRaw16(void *output, const void *input, unsigned int width)
std::copy(in, in + width, out);
}
/* Thumbnail function for raw data with each pixel aligned to 16bit. */
void thumbScanlineRaw(const FormatInfo &info, void *output, const void *input,
unsigned int width, unsigned int stride)
{
const uint16_t *in = static_cast<const uint16_t *>(input);
const uint16_t *in2 = static_cast<const uint16_t *>(input) + stride / 2;
uint8_t *out = static_cast<uint8_t *>(output);
/* Shift down to 8. */
unsigned int shift = info.bitsPerSample - 8;
/* 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;
value = value >> shift;
*out++ = value;
*out++ = value;
*out++ = value;
in += 16;
in2 += 16;
}
}
void packScanlineRaw10_CSI2P(void *output, const void *input, unsigned int width)
{
const uint8_t *in = static_cast<const uint8_t *>(input);
@ -321,25 +344,25 @@ const std::map<PixelFormat, FormatInfo> formatInfo = {
.bitsPerSample = 16,
.pattern = { CFAPatternBlue, CFAPatternGreen, CFAPatternGreen, CFAPatternRed },
.packScanline = packScanlineRaw16,
.thumbScanline = thumbScanlineRaw_CSI2P,
.thumbScanline = thumbScanlineRaw,
} },
{ formats::SGBRG16, {
.bitsPerSample = 16,
.pattern = { CFAPatternGreen, CFAPatternBlue, CFAPatternRed, CFAPatternGreen },
.packScanline = packScanlineRaw16,
.thumbScanline = thumbScanlineRaw_CSI2P,
.thumbScanline = thumbScanlineRaw,
} },
{ formats::SGRBG16, {
.bitsPerSample = 16,
.pattern = { CFAPatternGreen, CFAPatternRed, CFAPatternBlue, CFAPatternGreen },
.packScanline = packScanlineRaw16,
.thumbScanline = thumbScanlineRaw_CSI2P,
.thumbScanline = thumbScanlineRaw,
} },
{ formats::SRGGB16, {
.bitsPerSample = 16,
.pattern = { CFAPatternRed, CFAPatternGreen, CFAPatternGreen, CFAPatternBlue },
.packScanline = packScanlineRaw16,
.thumbScanline = thumbScanlineRaw_CSI2P,
.thumbScanline = thumbScanlineRaw,
} },
{ formats::SBGGR10_CSI2P, {
.bitsPerSample = 10,