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Merge pull request #15699 from TolyaTalamanov:at/graph-ocv-render-backend-skeleton

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G-API: Implement OpenCV render backend

* Implement render opencv backend

* Fix comment to review

* Add comment

* Add wrappers for kernels

* Fix comments to review

* Fix comment to review
This commit is contained in:
atalaman
2019-10-17 21:04:03 +03:00
committed by Alexander Alekhin
parent cc9b199ecb
commit 2ff12c4981
16 changed files with 483 additions and 126 deletions
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modules/gapi/src/api/render_ocv.cpp
+1 -57
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@@ -1,6 +1,5 @@
#include <opencv2/gapi/cpu/gcpukernel.hpp>
#include <opencv2/imgproc.hpp>
#include <opencv2/gapi/render.hpp> // Kernel API's
#include <opencv2/gapi/render/render.hpp> // Kernel API's
#include "api/render_ocv.hpp"
@@ -11,61 +10,6 @@ namespace gapi
namespace ocv
{
GAPI_OCV_KERNEL(GOCVRenderNV12, cv::gapi::wip::draw::GRenderNV12)
{
static void run(const cv::Mat& y, const cv::Mat& uv, const cv::gapi::wip::draw::Prims& prims,
cv::Mat& out_y, cv::Mat& out_uv)
{
/* FIXME How to render correctly on NV12 format ?
*
* Rendering on NV12 via OpenCV looks like this:
*
* y --------> 1)(NV12 -> YUV) -> yuv -> 2)draw -> yuv -> 3)split -------> out_y
* ^ |
* | |
* uv -------------- `----------> out_uv
*
*
* 1) Collect yuv mat from two planes, uv plain in two times less than y plane
* so, upsample uv in tow times, with bilinear interpolation
*
* 2) Render primitives on YUV
*
* 3) Convert yuv to NV12 (using bilinear interpolation)
*
*/
// NV12 -> YUV
cv::Mat upsample_uv, yuv;
cv::resize(uv, upsample_uv, uv.size() * 2, cv::INTER_LINEAR);
cv::merge(std::vector<cv::Mat>{y, upsample_uv}, yuv);
cv::gapi::wip::draw::drawPrimitivesOCVYUV(yuv, prims);
// YUV -> NV12
cv::Mat out_u, out_v, uv_plane;
std::vector<cv::Mat> chs = {out_y, out_u, out_v};
cv::split(yuv, chs);
cv::merge(std::vector<cv::Mat>{chs[1], chs[2]}, uv_plane);
cv::resize(uv_plane, out_uv, uv_plane.size() / 2, cv::INTER_LINEAR);
}
};
GAPI_OCV_KERNEL(GOCVRenderBGR, cv::gapi::wip::draw::GRenderBGR)
{
static void run(const cv::Mat&, const cv::gapi::wip::draw::Prims& prims, cv::Mat& out)
{
cv::gapi::wip::draw::drawPrimitivesOCVBGR(out, prims);
}
};
cv::gapi::GKernelPackage kernels()
{
static const auto pkg = cv::gapi::kernels<GOCVRenderNV12, GOCVRenderBGR>();
return pkg;
}
} // namespace ocv
namespace wip