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-rw-r--r--src/apps/common/dng_writer.cpp31
1 files changed, 27 insertions, 4 deletions
diff --git a/src/apps/common/dng_writer.cpp b/src/apps/common/dng_writer.cpp
index 3b17dadc..96bbd26b 100644
--- a/src/apps/common/dng_writer.cpp
+++ b/src/apps/common/dng_writer.cpp
@@ -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,