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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2021-05-21 12:18:54 +0300
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2021-05-22 02:56:25 +0300
commitcc2139ec63c2d062b077c9c221917325c3f30f17 (patch)
tree20a67c0fc52f1ec0f76426ffbe8671bd19b0e9cd /src/qcam/assets/feathericons/github.svg
parente56f1f493560e0b641bbe36a528a13767817afed (diff)
libcamera: log: Document LOG() restrictions
The LOG() macro uses the global Logger and LogCategory objects internally. This can result in crashes or other undefined behaviour when logging from destructors of global objects, as the Logger and/or the LogCategory instances may have been destroyed. This isn't ideal and should eventually be fixed. For the time being, document the restriction, and add a todo list item to fix the problem. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Hirokazu Honda <hiroh@chromium.org> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Diffstat (limited to 'src/qcam/assets/feathericons/github.svg')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.1 (git 2.18.0) at 2025-02-16 05:36:37 +0000
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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * format_convert.cpp - qcam - Convert buffer to RGB
 */

#include <errno.h>

#include <linux/drm_fourcc.h>

#include <QImage>

#include "format_converter.h"

#define RGBSHIFT		8
#ifndef MAX
#define MAX(a,b)		((a)>(b)?(a):(b))
#endif
#ifndef MIN
#define MIN(a,b)		((a)<(b)?(a):(b))
#endif
#ifndef CLAMP
#define CLAMP(a,low,high)	MAX((low),MIN((high),(a)))
#endif
#ifndef CLIP
#define CLIP(x)			CLAMP(x,0,255)
#endif

int FormatConverter::configure(unsigned int format, unsigned int width,
			       unsigned int height)
{
	switch (format) {
	case DRM_FORMAT_NV12:
		formatFamily_ = NV;
		horzSubSample_ = 2;
		vertSubSample_ = 2;
		nvSwap_ = false;
		break;
	case DRM_FORMAT_NV21:
		formatFamily_ = NV;
		horzSubSample_ = 2;
		vertSubSample_ = 2;
		nvSwap_ = true;
		break;
	case DRM_FORMAT_NV16:
		formatFamily_ = NV;
		horzSubSample_ = 2;
		vertSubSample_ = 1;
		nvSwap_ = false;
		break;
	case DRM_FORMAT_NV61:
		formatFamily_ = NV;
		horzSubSample_ = 2;
		vertSubSample_ = 1;
		nvSwap_ = true;
		break;
	case DRM_FORMAT_NV24:
		formatFamily_ = NV;
		horzSubSample_ = 1;
		vertSubSample_ = 1;
		nvSwap_ = false;
		break;
	case DRM_FORMAT_NV42:
		formatFamily_ = NV;
		horzSubSample_ = 1;
		vertSubSample_ = 1;
		nvSwap_ = true;
		break;
	case DRM_FORMAT_RGB888:
		formatFamily_ = RGB;
		r_pos_ = 2;
		g_pos_ = 1;
		b_pos_ = 0;
		bpp_ = 3;
		break;
	case DRM_FORMAT_BGR888:
		formatFamily_ = RGB;
		r_pos_ = 0;
		g_pos_ = 1;
		b_pos_ = 2;
		bpp_ = 3;
		break;
	case DRM_FORMAT_BGRA8888:
		formatFamily_ = RGB;
		r_pos_ = 1;
		g_pos_ = 2;
		b_pos_ = 3;
		bpp_ = 4;
		break;
	case DRM_FORMAT_VYUY:
		formatFamily_ = YUV;
		y_pos_ = 1;
		cb_pos_ = 2;
		break;
	case DRM_FORMAT_YVYU:
		formatFamily_ = YUV;
		y_pos_ = 0;
		cb_pos_ = 3;
		break;
	case DRM_FORMAT_UYVY:
		formatFamily_ = YUV;
		y_pos_ = 1;
		cb_pos_ = 0;
		break;
	case DRM_FORMAT_YUYV:
		formatFamily_ = YUV;
		y_pos_ = 0;
		cb_pos_ = 1;
		break;
	case DRM_FORMAT_MJPEG:
		formatFamily_ = MJPEG;
		break;
	default:
		return -EINVAL;
	};

	format_ = format;
	width_ = width;
	height_ = height;

	return 0;
}

void FormatConverter::convert(const unsigned char *src, size_t size,
			      QImage *dst)
{
	switch (formatFamily_) {
	case MJPEG:
		dst->loadFromData(src, size, "JPEG");
		break;
	case YUV:
		convertYUV(src, dst->bits());
		break;
	case RGB:
		convertRGB(src, dst->bits());
		break;
	case NV:
		convertNV(src, dst->bits());
		break;
	};
}

static void yuv_to_rgb(int y, int u, int v, int *r, int *g, int *b)
{
	int c = y - 16;
	int d = u - 128;
	int e = v - 128;
	*r = CLIP(( 298 * c           + 409 * e + 128) >> RGBSHIFT);
	*g = CLIP(( 298 * c - 100 * d - 208 * e + 128) >> RGBSHIFT);
	*b = CLIP(( 298 * c + 516 * d           + 128) >> RGBSHIFT);
}

void FormatConverter::convertNV(const unsigned char *src, unsigned char *dst)
{
	unsigned int c_stride = width_ * (2 / horzSubSample_);
	unsigned int c_inc = horzSubSample_ == 1 ? 2 : 0;
	unsigned int cb_pos = nvSwap_ ? 1 : 0;
	unsigned int cr_pos = nvSwap_ ? 0 : 1;
	const unsigned char *src_c = src + width_ * height_;
	int r, g, b;

	for (unsigned int y = 0; y < height_; y++) {
		const unsigned char *src_y = src + y * width_;
		const unsigned char *src_cb = src_c + (y / vertSubSample_) *
					      c_stride + cb_pos;
		const unsigned char *src_cr = src_c + (y / vertSubSample_) *
					      c_stride + cr_pos;

		for (unsigned int x = 0; x < width_; x += 2) {
			yuv_to_rgb(*src_y, *src_cb, *src_cr, &r, &g, &b);
			dst[0] = b;
			dst[1] = g;
			dst[2] = r;
			dst[3] = 0xff;
			src_y++;
			src_cb += c_inc;
			src_cr += c_inc;
			dst += 4;

			yuv_to_rgb(*src_y, *src_cb, *src_cr, &r, &g, &b);
			dst[0] = b;
			dst[1] = g;
			dst[2] = r;
			dst[3] = 0xff;
			src_y++;
			src_cb += 2;
			src_cr += 2;
			dst += 4;
		}
	}
}

void FormatConverter::convertRGB(const unsigned char *src, unsigned char *dst)
{