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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 "format_converter.h"
#include <errno.h>
#include <QImage>
#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(const libcamera::PixelFormat &format,
const QSize &size)
{
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_ARGB8888:
formatFamily_ = RGB;
r_pos_ = 2;
g_pos_ = 1;
b_pos_ = 0;
bpp_ = 4;
break;
case DRM_FORMAT_RGBA8888:
formatFamily_ = RGB;
r_pos_ = 3;
g_pos_ = 2;
b_pos_ = 1;
bpp_ = 4;
break;
case DRM_FORMAT_ABGR8888:
formatFamily_ = RGB;
r_pos_ = 0;
g_pos_ = 1;
b_pos_ = 2;
bpp_ = 4;
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_ = size.width();
height_ = size.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)
{
unsigned int x, y;
int r, g, b;
for (y = 0; y < height_; y++) {
for (x = 0; x < width_; x++) {
r = src[bpp_ * x + r_pos_];
g = src[bpp_ * x + g_pos_];
b = src[bpp_ * x + b_pos_];
dst[4 * x + 0] = b;
dst[4 * x + 1] = g;
dst[4 * x + 2] = r;
dst[4 * x + 3] = 0xff;
}
src += width_ * bpp_;
dst += width_ * 4;
}
}
void FormatConverter::convertYUV(const unsigned char *src, unsigned char *dst)
{
unsigned int src_x, src_y, dst_x, dst_y;
unsigned int src_stride;
unsigned int dst_stride;
unsigned int cr_pos;
int r, g, b, y, cr, cb;
cr_pos = (cb_pos_ + 2) % 4;
src_stride = width_ * 2;
dst_stride = width_ * 4;
for (src_y = 0, dst_y = 0; dst_y < height_; src_y++, dst_y++) {
for (src_x = 0, dst_x = 0; dst_x < width_; ) {
cb = src[src_y * src_stride + src_x * 4 + cb_pos_];
cr = src[src_y * src_stride + src_x * 4 + cr_pos];
y = src[src_y * src_stride + src_x * 4 + y_pos_];
yuv_to_rgb(y, cb, cr, &r, &g, &b);
dst[dst_y * dst_stride + 4 * dst_x + 0] = b;
dst[dst_y * dst_stride + 4 * dst_x + 1] = g;
dst[dst_y * dst_stride + 4 * dst_x + 2] = r;
dst[dst_y * dst_stride + 4 * dst_x + 3] = 0xff;
dst_x++;
y = src[src_y * src_stride + src_x * 4 + y_pos_ + 2];
yuv_to_rgb(y, cb, cr, &r, &g, &b);
dst[dst_y * dst_stride + 4 * dst_x + 0] = b;
dst[dst_y * dst_stride + 4 * dst_x + 1] = g;
dst[dst_y * dst_stride + 4 * dst_x + 2] = r;
dst[dst_y * dst_stride + 4 * dst_x + 3] = 0xff;
dst_x++;
src_x++;
}
}
}
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