mirror of
https://git.do.srb2.org/STJr/SRB2.git
synced 2024-11-22 12:31:32 +00:00
300 lines
8.3 KiB
C
300 lines
8.3 KiB
C
/*
|
|
Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
|
|
|
|
This software is provided 'as-is', without any express or implied
|
|
warranty. In no event will the authors be held liable for any damages
|
|
arising from the use of this software.
|
|
|
|
Permission is granted to anyone to use this software for any purpose,
|
|
including commercial applications, and to alter it and redistribute it
|
|
freely.
|
|
*/
|
|
|
|
#include "SDL.h"
|
|
|
|
#include "testyuv_cvt.h"
|
|
|
|
|
|
static float clip3(float x, float y, float z)
|
|
{
|
|
return ((z < x) ? x : ((z > y) ? y : z));
|
|
}
|
|
|
|
static void RGBtoYUV(Uint8 * rgb, int *yuv, SDL_YUV_CONVERSION_MODE mode, int monochrome, int luminance)
|
|
{
|
|
if (mode == SDL_YUV_CONVERSION_JPEG) {
|
|
/* Full range YUV */
|
|
yuv[0] = (int)(0.299 * rgb[0] + 0.587 * rgb[1] + 0.114 * rgb[2]);
|
|
yuv[1] = (int)((rgb[2] - yuv[0]) * 0.565 + 128);
|
|
yuv[2] = (int)((rgb[0] - yuv[0]) * 0.713 + 128);
|
|
} else {
|
|
// This formula is from Microsoft's documentation:
|
|
// https://msdn.microsoft.com/en-us/library/windows/desktop/dd206750(v=vs.85).aspx
|
|
// L = Kr * R + Kb * B + (1 - Kr - Kb) * G
|
|
// Y = floor(2^(M-8) * (219*(L-Z)/S + 16) + 0.5);
|
|
// U = clip3(0, (2^M)-1, floor(2^(M-8) * (112*(B-L) / ((1-Kb)*S) + 128) + 0.5));
|
|
// V = clip3(0, (2^M)-1, floor(2^(M-8) * (112*(R-L) / ((1-Kr)*S) + 128) + 0.5));
|
|
float S, Z, R, G, B, L, Kr, Kb, Y, U, V;
|
|
|
|
if (mode == SDL_YUV_CONVERSION_BT709) {
|
|
/* BT.709 */
|
|
Kr = 0.2126f;
|
|
Kb = 0.0722f;
|
|
} else {
|
|
/* BT.601 */
|
|
Kr = 0.299f;
|
|
Kb = 0.114f;
|
|
}
|
|
|
|
S = 255.0f;
|
|
Z = 0.0f;
|
|
R = rgb[0];
|
|
G = rgb[1];
|
|
B = rgb[2];
|
|
L = Kr * R + Kb * B + (1 - Kr - Kb) * G;
|
|
Y = (Uint8)SDL_floorf((219*(L-Z)/S + 16) + 0.5f);
|
|
U = (Uint8)clip3(0, 255, SDL_floorf((112.0f*(B-L) / ((1.0f-Kb)*S) + 128) + 0.5f));
|
|
V = (Uint8)clip3(0, 255, SDL_floorf((112.0f*(R-L) / ((1.0f-Kr)*S) + 128) + 0.5f));
|
|
|
|
yuv[0] = (Uint8)Y;
|
|
yuv[1] = (Uint8)U;
|
|
yuv[2] = (Uint8)V;
|
|
}
|
|
|
|
if (monochrome) {
|
|
yuv[1] = 128;
|
|
yuv[2] = 128;
|
|
}
|
|
|
|
if (luminance != 100) {
|
|
yuv[0] = yuv[0] * luminance / 100;
|
|
if (yuv[0] > 255)
|
|
yuv[0] = 255;
|
|
}
|
|
}
|
|
|
|
static void ConvertRGBtoPlanar2x2(Uint32 format, Uint8 *src, int pitch, Uint8 *out, int w, int h, SDL_YUV_CONVERSION_MODE mode, int monochrome, int luminance)
|
|
{
|
|
int x, y;
|
|
int yuv[4][3];
|
|
Uint8 *Y1, *Y2, *U, *V;
|
|
Uint8 *rgb1, *rgb2;
|
|
int rgb_row_advance = (pitch - w*3) + pitch;
|
|
int UV_advance;
|
|
|
|
rgb1 = src;
|
|
rgb2 = src + pitch;
|
|
|
|
Y1 = out;
|
|
Y2 = Y1 + w;
|
|
switch (format) {
|
|
case SDL_PIXELFORMAT_YV12:
|
|
V = (Y1 + h * w);
|
|
U = V + ((h + 1)/2)*((w + 1)/2);
|
|
UV_advance = 1;
|
|
break;
|
|
case SDL_PIXELFORMAT_IYUV:
|
|
U = (Y1 + h * w);
|
|
V = U + ((h + 1)/2)*((w + 1)/2);
|
|
UV_advance = 1;
|
|
break;
|
|
case SDL_PIXELFORMAT_NV12:
|
|
U = (Y1 + h * w);
|
|
V = U + 1;
|
|
UV_advance = 2;
|
|
break;
|
|
case SDL_PIXELFORMAT_NV21:
|
|
V = (Y1 + h * w);
|
|
U = V + 1;
|
|
UV_advance = 2;
|
|
break;
|
|
default:
|
|
SDL_assert(!"Unsupported planar YUV format");
|
|
return;
|
|
}
|
|
|
|
for (y = 0; y < (h - 1); y += 2) {
|
|
for (x = 0; x < (w - 1); x += 2) {
|
|
RGBtoYUV(rgb1, yuv[0], mode, monochrome, luminance);
|
|
rgb1 += 3;
|
|
*Y1++ = (Uint8)yuv[0][0];
|
|
|
|
RGBtoYUV(rgb1, yuv[1], mode, monochrome, luminance);
|
|
rgb1 += 3;
|
|
*Y1++ = (Uint8)yuv[1][0];
|
|
|
|
RGBtoYUV(rgb2, yuv[2], mode, monochrome, luminance);
|
|
rgb2 += 3;
|
|
*Y2++ = (Uint8)yuv[2][0];
|
|
|
|
RGBtoYUV(rgb2, yuv[3], mode, monochrome, luminance);
|
|
rgb2 += 3;
|
|
*Y2++ = (Uint8)yuv[3][0];
|
|
|
|
*U = (Uint8)SDL_floorf((yuv[0][1] + yuv[1][1] + yuv[2][1] + yuv[3][1])/4.0f + 0.5f);
|
|
U += UV_advance;
|
|
|
|
*V = (Uint8)SDL_floorf((yuv[0][2] + yuv[1][2] + yuv[2][2] + yuv[3][2])/4.0f + 0.5f);
|
|
V += UV_advance;
|
|
}
|
|
/* Last column */
|
|
if (x == (w - 1)) {
|
|
RGBtoYUV(rgb1, yuv[0], mode, monochrome, luminance);
|
|
rgb1 += 3;
|
|
*Y1++ = (Uint8)yuv[0][0];
|
|
|
|
RGBtoYUV(rgb2, yuv[2], mode, monochrome, luminance);
|
|
rgb2 += 3;
|
|
*Y2++ = (Uint8)yuv[2][0];
|
|
|
|
*U = (Uint8)SDL_floorf((yuv[0][1] + yuv[2][1])/2.0f + 0.5f);
|
|
U += UV_advance;
|
|
|
|
*V = (Uint8)SDL_floorf((yuv[0][2] + yuv[2][2])/2.0f + 0.5f);
|
|
V += UV_advance;
|
|
}
|
|
Y1 += w;
|
|
Y2 += w;
|
|
rgb1 += rgb_row_advance;
|
|
rgb2 += rgb_row_advance;
|
|
}
|
|
/* Last row */
|
|
if (y == (h - 1)) {
|
|
for (x = 0; x < (w - 1); x += 2) {
|
|
RGBtoYUV(rgb1, yuv[0], mode, monochrome, luminance);
|
|
rgb1 += 3;
|
|
*Y1++ = (Uint8)yuv[0][0];
|
|
|
|
RGBtoYUV(rgb1, yuv[1], mode, monochrome, luminance);
|
|
rgb1 += 3;
|
|
*Y1++ = (Uint8)yuv[1][0];
|
|
|
|
*U = (Uint8)SDL_floorf((yuv[0][1] + yuv[1][1])/2.0f + 0.5f);
|
|
U += UV_advance;
|
|
|
|
*V = (Uint8)SDL_floorf((yuv[0][2] + yuv[1][2])/2.0f + 0.5f);
|
|
V += UV_advance;
|
|
}
|
|
/* Last column */
|
|
if (x == (w - 1)) {
|
|
RGBtoYUV(rgb1, yuv[0], mode, monochrome, luminance);
|
|
*Y1++ = (Uint8)yuv[0][0];
|
|
|
|
*U = (Uint8)yuv[0][1];
|
|
U += UV_advance;
|
|
|
|
*V = (Uint8)yuv[0][2];
|
|
V += UV_advance;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void ConvertRGBtoPacked4(Uint32 format, Uint8 *src, int pitch, Uint8 *out, int w, int h, SDL_YUV_CONVERSION_MODE mode, int monochrome, int luminance)
|
|
{
|
|
int x, y;
|
|
int yuv[2][3];
|
|
Uint8 *Y1, *Y2, *U, *V;
|
|
Uint8 *rgb;
|
|
int rgb_row_advance = (pitch - w*3);
|
|
|
|
rgb = src;
|
|
|
|
switch (format) {
|
|
case SDL_PIXELFORMAT_YUY2:
|
|
Y1 = out;
|
|
U = out+1;
|
|
Y2 = out+2;
|
|
V = out+3;
|
|
break;
|
|
case SDL_PIXELFORMAT_UYVY:
|
|
U = out;
|
|
Y1 = out+1;
|
|
V = out+2;
|
|
Y2 = out+3;
|
|
break;
|
|
case SDL_PIXELFORMAT_YVYU:
|
|
Y1 = out;
|
|
V = out+1;
|
|
Y2 = out+2;
|
|
U = out+3;
|
|
break;
|
|
default:
|
|
SDL_assert(!"Unsupported packed YUV format");
|
|
return;
|
|
}
|
|
|
|
for (y = 0; y < h; ++y) {
|
|
for (x = 0; x < (w - 1); x += 2) {
|
|
RGBtoYUV(rgb, yuv[0], mode, monochrome, luminance);
|
|
rgb += 3;
|
|
*Y1 = (Uint8)yuv[0][0];
|
|
Y1 += 4;
|
|
|
|
RGBtoYUV(rgb, yuv[1], mode, monochrome, luminance);
|
|
rgb += 3;
|
|
*Y2 = (Uint8)yuv[1][0];
|
|
Y2 += 4;
|
|
|
|
*U = (Uint8)SDL_floorf((yuv[0][1] + yuv[1][1])/2.0f + 0.5f);
|
|
U += 4;
|
|
|
|
*V = (Uint8)SDL_floorf((yuv[0][2] + yuv[1][2])/2.0f + 0.5f);
|
|
V += 4;
|
|
}
|
|
/* Last column */
|
|
if (x == (w - 1)) {
|
|
RGBtoYUV(rgb, yuv[0], mode, monochrome, luminance);
|
|
rgb += 3;
|
|
*Y2 = *Y1 = (Uint8)yuv[0][0];
|
|
Y1 += 4;
|
|
Y2 += 4;
|
|
|
|
*U = (Uint8)yuv[0][1];
|
|
U += 4;
|
|
|
|
*V = (Uint8)yuv[0][2];
|
|
V += 4;
|
|
}
|
|
rgb += rgb_row_advance;
|
|
}
|
|
}
|
|
|
|
SDL_bool ConvertRGBtoYUV(Uint32 format, Uint8 *src, int pitch, Uint8 *out, int w, int h, SDL_YUV_CONVERSION_MODE mode, int monochrome, int luminance)
|
|
{
|
|
switch (format)
|
|
{
|
|
case SDL_PIXELFORMAT_YV12:
|
|
case SDL_PIXELFORMAT_IYUV:
|
|
case SDL_PIXELFORMAT_NV12:
|
|
case SDL_PIXELFORMAT_NV21:
|
|
ConvertRGBtoPlanar2x2(format, src, pitch, out, w, h, mode, monochrome, luminance);
|
|
return SDL_TRUE;
|
|
case SDL_PIXELFORMAT_YUY2:
|
|
case SDL_PIXELFORMAT_UYVY:
|
|
case SDL_PIXELFORMAT_YVYU:
|
|
ConvertRGBtoPacked4(format, src, pitch, out, w, h, mode, monochrome, luminance);
|
|
return SDL_TRUE;
|
|
default:
|
|
return SDL_FALSE;
|
|
}
|
|
}
|
|
|
|
int CalculateYUVPitch(Uint32 format, int width)
|
|
{
|
|
switch (format)
|
|
{
|
|
case SDL_PIXELFORMAT_YV12:
|
|
case SDL_PIXELFORMAT_IYUV:
|
|
case SDL_PIXELFORMAT_NV12:
|
|
case SDL_PIXELFORMAT_NV21:
|
|
return width;
|
|
case SDL_PIXELFORMAT_YUY2:
|
|
case SDL_PIXELFORMAT_UYVY:
|
|
case SDL_PIXELFORMAT_YVYU:
|
|
return 4*((width + 1)/2);
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* vi: set ts=4 sw=4 expandtab: */
|