[libcamera-devel] [PATCH v2 2/5] qcam: format_converter: Add configurable stride support

[paul.elder at ideasonboard.com]

Hi Laurent,

On Tue, Sep 07, 2021 at 03:20:41AM +0300, Laurent Pinchart wrote:
> Make the stride configurable to support convertion of images with
> padding at the end of lines.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>

Reviewed-by: Paul Elder <paul.elder at ideasonboard.com>

> ---
> Changes since v1:
> 
> - Fix bad rebase
> ---
>  src/qcam/format_converter.cpp | 11 ++++++-----
>  src/qcam/format_converter.h   |  4 +++-
>  src/qcam/viewfinder_qt.cpp    |  5 ++---
>  3 files changed, 11 insertions(+), 9 deletions(-)
> 
> diff --git a/src/qcam/format_converter.cpp b/src/qcam/format_converter.cpp
> index 673ad33e141d..b4c7b0ca0edf 100644
> --- a/src/qcam/format_converter.cpp
> +++ b/src/qcam/format_converter.cpp
> @@ -30,7 +30,7 @@
>  #endif
>  
>  int FormatConverter::configure(const libcamera::PixelFormat &format,
> -			       const QSize &size)
> +			       const QSize &size, unsigned int stride)
>  {
>  	switch (format) {
>  	case libcamera::formats::NV12:
> @@ -152,6 +152,7 @@ int FormatConverter::configure(const libcamera::PixelFormat &format,
>  	format_ = format;
>  	width_ = size.width();
>  	height_ = size.height();
> +	stride_ = stride;
>  
>  	return 0;
>  }
> @@ -186,7 +187,7 @@ static void yuv_to_rgb(int y, int u, int v, int *r, int *g, int *b)
>  
>  void FormatConverter::convertNV(const Image *srcImage, unsigned char *dst)
>  {
> -	unsigned int c_stride = width_ * (2 / horzSubSample_);
> +	unsigned int c_stride = stride_ * (2 / horzSubSample_);
>  	unsigned int c_inc = horzSubSample_ == 1 ? 2 : 0;
>  	unsigned int cb_pos = nvSwap_ ? 1 : 0;
>  	unsigned int cr_pos = nvSwap_ ? 0 : 1;
> @@ -195,7 +196,7 @@ void FormatConverter::convertNV(const Image *srcImage, unsigned char *dst)
>  	int r, g, b;
>  
>  	for (unsigned int y = 0; y < height_; y++) {
> -		const unsigned char *src_y = src + y * width_;
> +		const unsigned char *src_y = src + y * stride_;
>  		const unsigned char *src_cb = src_c + (y / vertSubSample_) *
>  					      c_stride + cb_pos;
>  		const unsigned char *src_cr = src_c + (y / vertSubSample_) *
> @@ -243,7 +244,7 @@ void FormatConverter::convertRGB(const Image *srcImage, unsigned char *dst)
>  			dst[4 * x + 3] = 0xff;
>  		}
>  
> -		src += width_ * bpp_;
> +		src += stride_;
>  		dst += width_ * 4;
>  	}
>  }
> @@ -258,7 +259,7 @@ void FormatConverter::convertYUV(const Image *srcImage, unsigned char *dst)
>  	int r, g, b, y, cr, cb;
>  
>  	cr_pos = (cb_pos_ + 2) % 4;
> -	src_stride = width_ * 2;
> +	src_stride = stride_;
>  	dst_stride = width_ * 4;
>  
>  	for (src_y = 0, dst_y = 0; dst_y < height_; src_y++, dst_y++) {
> diff --git a/src/qcam/format_converter.h b/src/qcam/format_converter.h
> index 2220a62b5f11..bb04aa959a1a 100644
> --- a/src/qcam/format_converter.h
> +++ b/src/qcam/format_converter.h
> @@ -19,7 +19,8 @@ class QImage;
>  class FormatConverter
>  {
>  public:
> -	int configure(const libcamera::PixelFormat &format, const QSize &size);
> +	int configure(const libcamera::PixelFormat &format, const QSize &size,
> +		      unsigned int stride);
>  
>  	void convert(const Image *src, size_t size, QImage *dst);
>  
> @@ -38,6 +39,7 @@ private:
>  	libcamera::PixelFormat format_;
>  	unsigned int width_;
>  	unsigned int height_;
> +	unsigned int stride_;
>  
>  	enum FormatFamily formatFamily_;
>  
> diff --git a/src/qcam/viewfinder_qt.cpp b/src/qcam/viewfinder_qt.cpp
> index cd051760160c..a05c75ed9e12 100644
> --- a/src/qcam/viewfinder_qt.cpp
> +++ b/src/qcam/viewfinder_qt.cpp
> @@ -52,8 +52,7 @@ const QList<libcamera::PixelFormat> &ViewFinderQt::nativeFormats() const
>  }
>  
>  int ViewFinderQt::setFormat(const libcamera::PixelFormat &format,
> -			    const QSize &size,
> -			    [[maybe_unused]] unsigned int stride)
> +			    const QSize &size, unsigned int stride)
>  {
>  	image_ = QImage();
>  
> @@ -62,7 +61,7 @@ int ViewFinderQt::setFormat(const libcamera::PixelFormat &format,
>  	 * the destination image.
>  	 */
>  	if (!::nativeFormats.contains(format)) {
> -		int ret = converter_.configure(format, size);
> +		int ret = converter_.configure(format, size, stride);
>  		if (ret < 0)
>  			return ret;
>  
> -- 
> Regards,
> 
> Laurent Pinchart
>