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android: jpeg: Configure thumbnailer based on request metadata

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Configure the thumbnailer based on the thumbnail parameters given by the
android request metadata. Only the thumbnail encoder needs to be
configured, and since it is only used at post-processing time, move the
configuration out of the post-processor constructor and into the
processing step.

Also set the following android result metadata tags:
- ANDROID_JPEG_THUMBNAIL_SIZE
- ANDROID_JPEG_THUMBNAIL_QUALITY

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Paul Elder
2021-01-23 13:56:01 +09:00
parent abfabdd6e7
commit 1264628d3c
5 changed files with 44 additions and 43 deletions
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25
src/android/jpeg/thumbnailer.cpp
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@@ -32,30 +32,11 @@ void Thumbnailer::configure(const Size &sourceSize, PixelFormat pixelFormat)
return;
}
targetSize_ = computeThumbnailSize();
valid_ = true;
}
/*
* The Exif specification recommends the width of the thumbnail to be a
* multiple of 16 (section 4.8.1). Hence, compute the corresponding height
* keeping the aspect ratio same as of the source.
*/
Size Thumbnailer::computeThumbnailSize() const
{
unsigned int targetHeight;
constexpr unsigned int kTargetWidth = 160;
targetHeight = kTargetWidth * sourceSize_.height / sourceSize_.width;
if (targetHeight & 1)
targetHeight++;
return Size(kTargetWidth, targetHeight);
}
void Thumbnailer::createThumbnail(const FrameBuffer &source,
const Size &targetSize,
std::vector<unsigned char> *destination)
{
MappedFrameBuffer frame(&source, PROT_READ);
@@ -73,8 +54,8 @@ void Thumbnailer::createThumbnail(const FrameBuffer &source,
const unsigned int sw = sourceSize_.width;
const unsigned int sh = sourceSize_.height;
const unsigned int tw = targetSize_.width;
const unsigned int th = targetSize_.height;
const unsigned int tw = targetSize.width;
const unsigned int th = targetSize.height;
ASSERT(tw % 2 == 0 && th % 2 == 0);