SDL/src/video/SDL_yuv.c

/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2026 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, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/
#include "SDL_internal.h"

#include "SDL_pixels_c.h"
#include "SDL_yuv_c.h"

#include "yuv2rgb/yuv_rgb.h"


#ifdef SDL_HAVE_YUV
static bool IsPlanar2x2Format(SDL_PixelFormat format);
#endif

/*
 * Calculate YUV size and pitch. Check for overflow.
 * Output 'pitch' that can be used with SDL_ConvertPixels()
 */
bool SDL_CalculateYUVSize(SDL_PixelFormat format, int w, int h, size_t *size, size_t *pitch)
{
#ifdef SDL_HAVE_YUV
    int sz_plane = 0, sz_plane_chroma = 0, sz_plane_packed = 0;

    if (IsPlanar2x2Format(format) == true) {
        {
            /* sz_plane == w * h; */
            size_t s1;
            if (!SDL_size_mul_check_overflow(w, h, &s1)) {
                return SDL_SetError("width * height would overflow");
            }
            sz_plane = (int) s1;
        }

        {
            /* sz_plane_chroma == ((w + 1) / 2) * ((h + 1) / 2); */
            size_t s1, s2, s3;
            if (!SDL_size_add_check_overflow(w, 1, &s1)) {
                return SDL_SetError("width + 1 would overflow");
            }
            s1 = s1 / 2;
            if (!SDL_size_add_check_overflow(h, 1, &s2)) {
                return SDL_SetError("height + 1 would overflow");
            }
            s2 = s2 / 2;
            if (!SDL_size_mul_check_overflow(s1, s2, &s3)) {
                return SDL_SetError("width * height would overflow");
            }
            sz_plane_chroma = (int) s3;
        }
    } else {
        /* sz_plane_packed == ((w + 1) / 2) * h; */
        size_t s1, s2;
        if (!SDL_size_add_check_overflow(w, 1, &s1)) {
            return SDL_SetError("width + 1 would overflow");
        }
        s1 = s1 / 2;
        if (!SDL_size_mul_check_overflow(s1, h, &s2)) {
            return SDL_SetError("width * height would overflow");
        }
        sz_plane_packed = (int) s2;
    }

    switch (format) {
    case SDL_PIXELFORMAT_YV12: /**< Planar mode: Y + V + U  (3 planes) */
    case SDL_PIXELFORMAT_IYUV: /**< Planar mode: Y + U + V  (3 planes) */

        if (pitch) {
            *pitch = w;
        }

        if (size) {
            // dst_size == sz_plane + sz_plane_chroma + sz_plane_chroma;
            size_t s1, s2;
            if (!SDL_size_add_check_overflow(sz_plane, sz_plane_chroma, &s1)) {
                return SDL_SetError("Y + U would overflow");
            }
            if (!SDL_size_add_check_overflow(s1, sz_plane_chroma, &s2)) {
                return SDL_SetError("Y + U + V would overflow");
            }
            *size = (int)s2;
        }
        break;

    case SDL_PIXELFORMAT_YUY2: /**< Packed mode: Y0+U0+Y1+V0 (1 plane) */
    case SDL_PIXELFORMAT_UYVY: /**< Packed mode: U0+Y0+V0+Y1 (1 plane) */
    case SDL_PIXELFORMAT_YVYU: /**< Packed mode: Y0+V0+Y1+U0 (1 plane) */

        if (pitch) {
            /* pitch == ((w + 1) / 2) * 4; */
           size_t p1, p2;
           if (!SDL_size_add_check_overflow(w, 1, &p1)) {
               return SDL_SetError("width + 1 would overflow");
           }
           p1 = p1 / 2;
           if (!SDL_size_mul_check_overflow(p1, 4, &p2)) {
               return SDL_SetError("width * 4 would overflow");
           }
           *pitch = p2;
        }

        if (size) {
            /* dst_size == 4 * sz_plane_packed; */
            size_t s1;
            if (!SDL_size_mul_check_overflow(sz_plane_packed, 4, &s1)) {
                return SDL_SetError("plane * 4 would overflow");
            }
            *size = (int) s1;
        }
        break;

    case SDL_PIXELFORMAT_NV12: /**< Planar mode: Y + U/V interleaved  (2 planes) */
    case SDL_PIXELFORMAT_NV21: /**< Planar mode: Y + V/U interleaved  (2 planes) */
        if (pitch) {
            *pitch = w;
        }

        if (size) {
            // dst_size == sz_plane + sz_plane_chroma + sz_plane_chroma;
            size_t s1, s2;
            if (!SDL_size_add_check_overflow(sz_plane, sz_plane_chroma, &s1)) {
                return SDL_SetError("Y + U would overflow");
            }
            if (!SDL_size_add_check_overflow(s1, sz_plane_chroma, &s2)) {
                return SDL_SetError("Y + U + V would overflow");
            }
            *size = (int) s2;
        }
        break;

    default:
        return SDL_Unsupported();
    }

    return true;
#else
    return SDL_Unsupported();
#endif
}

#ifdef SDL_HAVE_YUV

static bool GetYUVConversionType(SDL_Colorspace colorspace, YCbCrType *yuv_type)
{
    if (SDL_ISCOLORSPACE_MATRIX_BT601(colorspace)) {
        if (SDL_ISCOLORSPACE_LIMITED_RANGE(colorspace)) {
            *yuv_type = YCBCR_601_LIMITED;
        } else {
            *yuv_type = YCBCR_601_FULL;
        }
        return true;
    }

    if (SDL_ISCOLORSPACE_MATRIX_BT709(colorspace)) {
        if (SDL_ISCOLORSPACE_LIMITED_RANGE(colorspace)) {
            *yuv_type = YCBCR_709_LIMITED;
        } else {
            *yuv_type = YCBCR_709_FULL;
        }
        return true;
    }

    if (SDL_ISCOLORSPACE_MATRIX_BT2020_NCL(colorspace)) {
        if (SDL_ISCOLORSPACE_FULL_RANGE(colorspace)) {
            *yuv_type = YCBCR_2020_NCL_FULL;
            return true;
        }
    }

    return SDL_SetError("Unsupported YUV colorspace");
}

static bool IsPlanar2x2Format(SDL_PixelFormat format)
{
    return format == SDL_PIXELFORMAT_YV12 || format == SDL_PIXELFORMAT_IYUV || format == SDL_PIXELFORMAT_NV12 || format == SDL_PIXELFORMAT_NV21 || format == SDL_PIXELFORMAT_P010;
}

static bool IsPacked4Format(Uint32 format)
{
    return format == SDL_PIXELFORMAT_YUY2 || format == SDL_PIXELFORMAT_UYVY || format == SDL_PIXELFORMAT_YVYU;
}

static bool GetYUVPlanes(int width, int height, SDL_PixelFormat format, const void *yuv, int yuv_pitch,
                         const Uint8 **y, const Uint8 **u, const Uint8 **v, Uint32 *y_stride, Uint32 *uv_stride)
{
    const Uint8 *planes[3] = { NULL, NULL, NULL };
    int pitches[3] = { 0, 0, 0 };
    int uv_width;

    switch (format) {
    case SDL_PIXELFORMAT_YV12:
    case SDL_PIXELFORMAT_IYUV:
        pitches[0] = yuv_pitch;
        pitches[1] = (pitches[0] + 1) / 2;
        pitches[2] = (pitches[0] + 1) / 2;
        planes[0] = (const Uint8 *)yuv;
        planes[1] = planes[0] + pitches[0] * height;
        planes[2] = planes[1] + pitches[1] * ((height + 1) / 2);
        break;
    case SDL_PIXELFORMAT_YUY2:
    case SDL_PIXELFORMAT_UYVY:
    case SDL_PIXELFORMAT_YVYU:
        pitches[0] = yuv_pitch;
        planes[0] = (const Uint8 *)yuv;
        break;
    case SDL_PIXELFORMAT_NV12:
    case SDL_PIXELFORMAT_NV21:
        pitches[0] = yuv_pitch;
        pitches[1] = 2 * ((pitches[0] + 1) / 2);
        planes[0] = (const Uint8 *)yuv;
        planes[1] = planes[0] + pitches[0] * height;
        break;
    case SDL_PIXELFORMAT_P010:
        pitches[0] = yuv_pitch;
        uv_width = ((width + 1) / 2) * 2;
        pitches[1] = SDL_max(pitches[0], (int)(uv_width * sizeof(Uint16)));
        planes[0] = (const Uint8 *)yuv;
        planes[1] = planes[0] + pitches[0] * height;
        break;
    default:
        return SDL_SetError("GetYUVPlanes(): Unsupported YUV format: %s", SDL_GetPixelFormatName(format));
    }

    switch (format) {
    case SDL_PIXELFORMAT_YV12:
        *y = planes[0];
        *y_stride = pitches[0];
        *v = planes[1];
        *u = planes[2];
        *uv_stride = pitches[1];
        break;
    case SDL_PIXELFORMAT_IYUV:
        *y = planes[0];
        *y_stride = pitches[0];
        *v = planes[2];
        *u = planes[1];
        *uv_stride = pitches[1];
        break;
    case SDL_PIXELFORMAT_YUY2:
        *y = planes[0];
        *y_stride = pitches[0];
        *v = *y + 3;
        *u = *y + 1;
        *uv_stride = pitches[0];
        break;
    case SDL_PIXELFORMAT_UYVY:
        *y = planes[0] + 1;
        *y_stride = pitches[0];
        *v = *y + 1;
        *u = *y - 1;
        *uv_stride = pitches[0];
        break;
    case SDL_PIXELFORMAT_YVYU:
        *y = planes[0];
        *y_stride = pitches[0];
        *v = *y + 1;
        *u = *y + 3;
        *uv_stride = pitches[0];
        break;
    case SDL_PIXELFORMAT_NV12:
        *y = planes[0];
        *y_stride = pitches[0];
        *u = planes[1];
        *v = *u + 1;
        *uv_stride = pitches[1];
        break;
    case SDL_PIXELFORMAT_NV21:
        *y = planes[0];
        *y_stride = pitches[0];
        *v = planes[1];
        *u = *v + 1;
        *uv_stride = pitches[1];
        break;
    case SDL_PIXELFORMAT_P010:
        *y = planes[0];
        *y_stride = pitches[0];
        *u = planes[1];
        *v = *u + sizeof(Uint16);
        *uv_stride = pitches[1];
        break;
    default:
        // Should have caught this above
        return SDL_SetError("GetYUVPlanes[2]: Unsupported YUV format: %s", SDL_GetPixelFormatName(format));
    }
    return true;
}

#ifdef SDL_SSE2_INTRINSICS
static bool SDL_TARGETING("sse2") yuv_rgb_sse(
    SDL_PixelFormat src_format, SDL_PixelFormat dst_format,
    Uint32 width, Uint32 height,
    const Uint8 *y, const Uint8 *u, const Uint8 *v, Uint32 y_stride, Uint32 uv_stride,
    Uint8 *rgb, Uint32 rgb_stride,
    YCbCrType yuv_type)
{
    if (!SDL_HasSSE2()) {
        return false;
    }

    if (src_format == SDL_PIXELFORMAT_YV12 ||
        src_format == SDL_PIXELFORMAT_IYUV) {

        switch (dst_format) {
        case SDL_PIXELFORMAT_RGB565:
            yuv420_rgb565_sseu(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_RGB24:
            yuv420_rgb24_sseu(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_RGBX8888:
        case SDL_PIXELFORMAT_RGBA8888:
            yuv420_rgba_sseu(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_BGRX8888:
        case SDL_PIXELFORMAT_BGRA8888:
            yuv420_bgra_sseu(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_XRGB8888:
        case SDL_PIXELFORMAT_ARGB8888:
            yuv420_argb_sseu(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_XBGR8888:
        case SDL_PIXELFORMAT_ABGR8888:
            yuv420_abgr_sseu(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        default:
            break;
        }
    }

    if (src_format == SDL_PIXELFORMAT_YUY2 ||
        src_format == SDL_PIXELFORMAT_UYVY ||
        src_format == SDL_PIXELFORMAT_YVYU) {

        switch (dst_format) {
        case SDL_PIXELFORMAT_RGB565:
            yuv422_rgb565_sseu(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_RGB24:
            yuv422_rgb24_sseu(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_RGBX8888:
        case SDL_PIXELFORMAT_RGBA8888:
            yuv422_rgba_sseu(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_BGRX8888:
        case SDL_PIXELFORMAT_BGRA8888:
            yuv422_bgra_sseu(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_XRGB8888:
        case SDL_PIXELFORMAT_ARGB8888:
            yuv422_argb_sseu(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_XBGR8888:
        case SDL_PIXELFORMAT_ABGR8888:
            yuv422_abgr_sseu(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        default:
            break;
        }
    }

    if (src_format == SDL_PIXELFORMAT_NV12 ||
        src_format == SDL_PIXELFORMAT_NV21) {

        switch (dst_format) {
        case SDL_PIXELFORMAT_RGB565:
            yuvnv12_rgb565_sseu(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_RGB24:
            yuvnv12_rgb24_sseu(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_RGBX8888:
        case SDL_PIXELFORMAT_RGBA8888:
            yuvnv12_rgba_sseu(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_BGRX8888:
        case SDL_PIXELFORMAT_BGRA8888:
            yuvnv12_bgra_sseu(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_XRGB8888:
        case SDL_PIXELFORMAT_ARGB8888:
            yuvnv12_argb_sseu(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_XBGR8888:
        case SDL_PIXELFORMAT_ABGR8888:
            yuvnv12_abgr_sseu(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        default:
            break;
        }
    }
    return false;
}
#else
static bool yuv_rgb_sse(
    SDL_PixelFormat src_format, SDL_PixelFormat dst_format,
    Uint32 width, Uint32 height,
    const Uint8 *y, const Uint8 *u, const Uint8 *v, Uint32 y_stride, Uint32 uv_stride,
    Uint8 *rgb, Uint32 rgb_stride,
    YCbCrType yuv_type)
{
    return false;
}
#endif

#ifdef SDL_LSX_INTRINSICS
static bool yuv_rgb_lsx(
    SDL_PixelFormat src_format, SDL_PixelFormat dst_format,
    Uint32 width, Uint32 height,
    const Uint8 *y, const Uint8 *u, const Uint8 *v, Uint32 y_stride, Uint32 uv_stride,
    Uint8 *rgb, Uint32 rgb_stride,
    YCbCrType yuv_type)
{
    if (!SDL_HasLSX()) {
        return false;
    }
    if (src_format == SDL_PIXELFORMAT_YV12 ||
        src_format == SDL_PIXELFORMAT_IYUV) {

        switch (dst_format) {
        case SDL_PIXELFORMAT_RGB24:
            yuv420_rgb24_lsx(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_RGBX8888:
        case SDL_PIXELFORMAT_RGBA8888:
            yuv420_rgba_lsx(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_BGRX8888:
        case SDL_PIXELFORMAT_BGRA8888:
            yuv420_bgra_lsx(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_XRGB8888:
        case SDL_PIXELFORMAT_ARGB8888:
            yuv420_argb_lsx(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_XBGR8888:
        case SDL_PIXELFORMAT_ABGR8888:
            yuv420_abgr_lsx(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        default:
            break;
        }
    }
    return false;
}
#else
static bool yuv_rgb_lsx(
    SDL_PixelFormat src_format, SDL_PixelFormat dst_format,
    Uint32 width, Uint32 height,
    const Uint8 *y, const Uint8 *u, const Uint8 *v, Uint32 y_stride, Uint32 uv_stride,
    Uint8 *rgb, Uint32 rgb_stride,
    YCbCrType yuv_type)
{
    return false;
}
#endif

static bool yuv_rgb_std(
    SDL_PixelFormat src_format, SDL_PixelFormat dst_format,
    Uint32 width, Uint32 height,
    const Uint8 *y, const Uint8 *u, const Uint8 *v, Uint32 y_stride, Uint32 uv_stride,
    Uint8 *rgb, Uint32 rgb_stride,
    YCbCrType yuv_type)
{
    if (src_format == SDL_PIXELFORMAT_YV12 ||
        src_format == SDL_PIXELFORMAT_IYUV) {

        switch (dst_format) {
        case SDL_PIXELFORMAT_RGB565:
            yuv420_rgb565_std(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_RGB24:
            yuv420_rgb24_std(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_RGBX8888:
        case SDL_PIXELFORMAT_RGBA8888:
            yuv420_rgba_std(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_BGRX8888:
        case SDL_PIXELFORMAT_BGRA8888:
            yuv420_bgra_std(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_XRGB8888:
        case SDL_PIXELFORMAT_ARGB8888:
            yuv420_argb_std(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_XBGR8888:
        case SDL_PIXELFORMAT_ABGR8888:
            yuv420_abgr_std(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        default:
            break;
        }
    }

    if (src_format == SDL_PIXELFORMAT_YUY2 ||
        src_format == SDL_PIXELFORMAT_UYVY ||
        src_format == SDL_PIXELFORMAT_YVYU) {

        switch (dst_format) {
        case SDL_PIXELFORMAT_RGB565:
            yuv422_rgb565_std(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_RGB24:
            yuv422_rgb24_std(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_RGBX8888:
        case SDL_PIXELFORMAT_RGBA8888:
            yuv422_rgba_std(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_BGRX8888:
        case SDL_PIXELFORMAT_BGRA8888:
            yuv422_bgra_std(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_XRGB8888:
        case SDL_PIXELFORMAT_ARGB8888:
            yuv422_argb_std(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_XBGR8888:
        case SDL_PIXELFORMAT_ABGR8888:
            yuv422_abgr_std(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        default:
            break;
        }
    }

    if (src_format == SDL_PIXELFORMAT_NV12 ||
        src_format == SDL_PIXELFORMAT_NV21) {

        switch (dst_format) {
        case SDL_PIXELFORMAT_RGB565:
            yuvnv12_rgb565_std(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_RGB24:
            yuvnv12_rgb24_std(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_RGBX8888:
        case SDL_PIXELFORMAT_RGBA8888:
            yuvnv12_rgba_std(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_BGRX8888:
        case SDL_PIXELFORMAT_BGRA8888:
            yuvnv12_bgra_std(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_XRGB8888:
        case SDL_PIXELFORMAT_ARGB8888:
            yuvnv12_argb_std(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        case SDL_PIXELFORMAT_XBGR8888:
        case SDL_PIXELFORMAT_ABGR8888:
            yuvnv12_abgr_std(width, height, y, u, v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        default:
            break;
        }
    }

    if (src_format == SDL_PIXELFORMAT_P010) {
        switch (dst_format) {
        case SDL_PIXELFORMAT_XBGR2101010:
            yuvp010_xbgr2101010_std(width, height, (const uint16_t *)y, (const uint16_t *)u, (const uint16_t *)v, y_stride, uv_stride, rgb, rgb_stride, yuv_type);
            return true;
        default:
            break;
        }
    }
    return false;
}

bool SDL_ConvertPixels_YUV_to_RGB(int width, int height,
                                  SDL_PixelFormat src_format, SDL_Colorspace src_colorspace, SDL_PropertiesID src_properties, const void *src, int src_pitch,
                                  SDL_PixelFormat dst_format, SDL_Colorspace dst_colorspace, SDL_PropertiesID dst_properties, void *dst, int dst_pitch)
{
    const Uint8 *y = NULL;
    const Uint8 *u = NULL;
    const Uint8 *v = NULL;
    Uint32 y_stride = 0;
    Uint32 uv_stride = 0;
    YCbCrType yuv_type = YCBCR_601_LIMITED;

    if (!GetYUVPlanes(width, height, src_format, src, src_pitch, &y, &u, &v, &y_stride, &uv_stride)) {
        return false;
    }

    if (!GetYUVConversionType(src_colorspace, &yuv_type)) {
        return false;
    }

    if (yuv_rgb_sse(src_format, dst_format, width, height, y, u, v, y_stride, uv_stride, (Uint8 *)dst, dst_pitch, yuv_type)) {
        return true;
    }

    if (yuv_rgb_lsx(src_format, dst_format, width, height, y, u, v, y_stride, uv_stride, (Uint8 *)dst, dst_pitch, yuv_type)) {
        return true;
    }

    if (yuv_rgb_std(src_format, dst_format, width, height, y, u, v, y_stride, uv_stride, (Uint8 *)dst, dst_pitch, yuv_type)) {
        return true;
    }

    // No fast path for the RGB format, instead convert using an intermediate buffer
    if (src_format == SDL_PIXELFORMAT_P010 && dst_format != SDL_PIXELFORMAT_XBGR2101010) {
        bool result;
        void *tmp;
        int tmp_pitch = (width * sizeof(Uint32));

        tmp = SDL_malloc((size_t)tmp_pitch * height);
        if (!tmp) {
            return false;
        }

        // convert src/src_format to tmp/XBGR2101010
        result = SDL_ConvertPixels_YUV_to_RGB(width, height, src_format, src_colorspace, src_properties, src, src_pitch, SDL_PIXELFORMAT_XBGR2101010, src_colorspace, src_properties, tmp, tmp_pitch);
        if (!result) {
            SDL_free(tmp);
            return false;
        }

        // convert tmp/XBGR2101010 to dst/RGB
        result = SDL_ConvertPixelsAndColorspace(width, height, SDL_PIXELFORMAT_XBGR2101010, src_colorspace, src_properties, tmp, tmp_pitch, dst_format, dst_colorspace, dst_properties, dst, dst_pitch);
        SDL_free(tmp);
        return result;
    }

    if (dst_format != SDL_PIXELFORMAT_ARGB8888) {
        bool result;
        void *tmp;
        int tmp_pitch = (width * sizeof(Uint32));

        tmp = SDL_malloc((size_t)tmp_pitch * height);
        if (!tmp) {
            return false;
        }

        // convert src/src_format to tmp/ARGB8888
        result = SDL_ConvertPixels_YUV_to_RGB(width, height, src_format, src_colorspace, src_properties, src, src_pitch, SDL_PIXELFORMAT_ARGB8888, SDL_COLORSPACE_SRGB, 0, tmp, tmp_pitch);
        if (!result) {
            SDL_free(tmp);
            return false;
        }

        // convert tmp/ARGB8888 to dst/RGB
        result = SDL_ConvertPixelsAndColorspace(width, height, SDL_PIXELFORMAT_ARGB8888, SDL_COLORSPACE_SRGB, 0, tmp, tmp_pitch, dst_format, dst_colorspace, dst_properties, dst, dst_pitch);
        SDL_free(tmp);
        return result;
    }

    return SDL_SetError("Unsupported YUV conversion");
}

struct RGB2YUVFactors
{
    int y_offset;
    float y[3]; // Rfactor, Gfactor, Bfactor
    float u[3]; // Rfactor, Gfactor, Bfactor
    float v[3]; // Rfactor, Gfactor, Bfactor
};

static struct RGB2YUVFactors RGB2YUVFactorTables[] = {
    // ITU-T T.871 (JPEG)
    {
        0,
        { 0.2990f, 0.5870f, 0.1140f },
        { -0.1687f, -0.3313f, 0.5000f },
        { 0.5000f, -0.4187f, -0.0813f },
    },
    // ITU-R BT.601-7
    {
        16,
        { 0.2568f, 0.5041f, 0.0979f },
        { -0.1482f, -0.2910f, 0.4392f },
        { 0.4392f, -0.3678f, -0.0714f },
    },
    // ITU-R BT.709-6 full range
    {
        0,
        { 0.2126f, 0.7152f, 0.0722f },
        { -0.1141f, -0.3839f, 0.498f },
        { 0.498f, -0.4524f, -0.0457f },
    },
    // ITU-R BT.709-6
    {
        16,
        { 0.1826f, 0.6142f, 0.0620f },
        { -0.1006f, -0.3386f, 0.4392f },
        { 0.4392f, -0.3989f, -0.0403f },
    },
    // ITU-R BT.2020 10-bit full range
    {
        0,
        { 0.2627f, 0.6780f, 0.0593f },
        { -0.1395f, -0.3600f, 0.4995f },
        { 0.4995f, -0.4593f, -0.0402f },
    },
};

static bool SDL_ConvertPixels_XRGB8888_to_YUV(int width, int height, const void *src, int src_pitch, SDL_PixelFormat dst_format, void *dst, int dst_pitch, YCbCrType yuv_type)
{
    const int src_pitch_x_2 = src_pitch * 2;
    const int height_half = height / 2;
    const int height_remainder = (height & 0x1);
    const int width_half = width / 2;
    const int width_remainder = (width & 0x1);
    int i, j;

    const struct RGB2YUVFactors *cvt = &RGB2YUVFactorTables[yuv_type];

#define MAKE_Y(r, g, b) (Uint8)SDL_clamp(((int)(cvt->y[0] * (r) + cvt->y[1] * (g) + cvt->y[2] * (b) + 0.5f) + cvt->y_offset), 0, 255)
#define MAKE_U(r, g, b) (Uint8)SDL_clamp(((int)(cvt->u[0] * (r) + cvt->u[1] * (g) + cvt->u[2] * (b) + 0.5f) + 128), 0, 255)
#define MAKE_V(r, g, b) (Uint8)SDL_clamp(((int)(cvt->v[0] * (r) + cvt->v[1] * (g) + cvt->v[2] * (b) + 0.5f) + 128), 0, 255)

#define READ_2x2_PIXELS                                                                                     \
    const Uint32 p1 = ((const Uint32 *)curr_row)[2 * i];                                                    \
    const Uint32 p2 = ((const Uint32 *)curr_row)[2 * i + 1];                                                \
    const Uint32 p3 = ((const Uint32 *)next_row)[2 * i];                                                    \
    const Uint32 p4 = ((const Uint32 *)next_row)[2 * i + 1];                                                \
    const Uint32 r = ((p1 & 0x00ff0000) + (p2 & 0x00ff0000) + (p3 & 0x00ff0000) + (p4 & 0x00ff0000)) >> 18; \
    const Uint32 g = ((p1 & 0x0000ff00) + (p2 & 0x0000ff00) + (p3 & 0x0000ff00) + (p4 & 0x0000ff00)) >> 10; \
    const Uint32 b = ((p1 & 0x000000ff) + (p2 & 0x000000ff) + (p3 & 0x000000ff) + (p4 & 0x000000ff)) >> 2;

#define READ_2x1_PIXELS                                             \
    const Uint32 p1 = ((const Uint32 *)curr_row)[2 * i];            \
    const Uint32 p2 = ((const Uint32 *)next_row)[2 * i];            \
    const Uint32 r = ((p1 & 0x00ff0000) + (p2 & 0x00ff0000)) >> 17; \
    const Uint32 g = ((p1 & 0x0000ff00) + (p2 & 0x0000ff00)) >> 9;  \
    const Uint32 b = ((p1 & 0x000000ff) + (p2 & 0x000000ff)) >> 1;

#define READ_1x2_PIXELS                                             \
    const Uint32 p1 = ((const Uint32 *)curr_row)[2 * i];            \
    const Uint32 p2 = ((const Uint32 *)curr_row)[2 * i + 1];        \
    const Uint32 r = ((p1 & 0x00ff0000) + (p2 & 0x00ff0000)) >> 17; \
    const Uint32 g = ((p1 & 0x0000ff00) + (p2 & 0x0000ff00)) >> 9;  \
    const Uint32 b = ((p1 & 0x000000ff) + (p2 & 0x000000ff)) >> 1;

#define READ_1x1_PIXEL                                  \
    const Uint32 p = ((const Uint32 *)curr_row)[2 * i]; \
    const Uint32 r = (p & 0x00ff0000) >> 16;            \
    const Uint32 g = (p & 0x0000ff00) >> 8;             \
    const Uint32 b = (p & 0x000000ff);

#define READ_TWO_RGB_PIXELS                                  \
    const Uint32 p = ((const Uint32 *)curr_row)[2 * i];      \
    const Uint32 r = (p & 0x00ff0000) >> 16;                 \
    const Uint32 g = (p & 0x0000ff00) >> 8;                  \
    const Uint32 b = (p & 0x000000ff);                       \
    const Uint32 p1 = ((const Uint32 *)curr_row)[2 * i + 1]; \
    const Uint32 r1 = (p1 & 0x00ff0000) >> 16;               \
    const Uint32 g1 = (p1 & 0x0000ff00) >> 8;                \
    const Uint32 b1 = (p1 & 0x000000ff);                     \
    const Uint32 R = (r + r1) / 2;                           \
    const Uint32 G = (g + g1) / 2;                           \
    const Uint32 B = (b + b1) / 2;

#define READ_ONE_RGB_PIXEL READ_1x1_PIXEL

    switch (dst_format) {
    case SDL_PIXELFORMAT_YV12:
    case SDL_PIXELFORMAT_IYUV:
    case SDL_PIXELFORMAT_NV12:
    case SDL_PIXELFORMAT_NV21:
    {
        const Uint8 *curr_row, *next_row;

        Uint8 *plane_y;
        Uint8 *plane_u;
        Uint8 *plane_v;
        Uint8 *plane_interleaved_uv;
        Uint32 y_stride, uv_stride, y_skip, uv_skip;

        if (!GetYUVPlanes(width, height, dst_format, dst, dst_pitch,
                          (const Uint8 **)&plane_y, (const Uint8 **)&plane_u, (const Uint8 **)&plane_v,
                          &y_stride, &uv_stride)) {
            return false;
        }

        plane_interleaved_uv = (plane_y + height * y_stride);
        y_skip = (y_stride - width);

        curr_row = (const Uint8 *)src;

        // Write Y plane
        for (j = 0; j < height; j++) {
            for (i = 0; i < width; i++) {
                const Uint32 p1 = ((const Uint32 *)curr_row)[i];
                const Uint32 r = (p1 & 0x00ff0000) >> 16;
                const Uint32 g = (p1 & 0x0000ff00) >> 8;
                const Uint32 b = (p1 & 0x000000ff);
                *plane_y++ = MAKE_Y(r, g, b);
            }
            plane_y += y_skip;
            curr_row += src_pitch;
        }

        curr_row = (const Uint8 *)src;
        next_row = (const Uint8 *)src;
        next_row += src_pitch;

        if (dst_format == SDL_PIXELFORMAT_YV12 || dst_format == SDL_PIXELFORMAT_IYUV) {
            // Write UV planes, not interleaved
            uv_skip = (uv_stride - (width + 1) / 2);
            for (j = 0; j < height_half; j++) {
                for (i = 0; i < width_half; i++) {
                    READ_2x2_PIXELS;
                    *plane_u++ = MAKE_U(r, g, b);
                    *plane_v++ = MAKE_V(r, g, b);
                }
                if (width_remainder) {
                    READ_2x1_PIXELS;
                    *plane_u++ = MAKE_U(r, g, b);
                    *plane_v++ = MAKE_V(r, g, b);
                }
                plane_u += uv_skip;
                plane_v += uv_skip;
                curr_row += src_pitch_x_2;
                next_row += src_pitch_x_2;
            }
            if (height_remainder) {
                for (i = 0; i < width_half; i++) {
                    READ_1x2_PIXELS;
                    *plane_u++ = MAKE_U(r, g, b);
                    *plane_v++ = MAKE_V(r, g, b);
                }
                if (width_remainder) {
                    READ_1x1_PIXEL;
                    *plane_u++ = MAKE_U(r, g, b);
                    *plane_v++ = MAKE_V(r, g, b);
                }
                plane_u += uv_skip;
                plane_v += uv_skip;
            }
        } else if (dst_format == SDL_PIXELFORMAT_NV12) {
            uv_skip = (uv_stride - ((width + 1) / 2) * 2);
            for (j = 0; j < height_half; j++) {
                for (i = 0; i < width_half; i++) {
                    READ_2x2_PIXELS;
                    *plane_interleaved_uv++ = MAKE_U(r, g, b);
                    *plane_interleaved_uv++ = MAKE_V(r, g, b);
                }
                if (width_remainder) {
                    READ_2x1_PIXELS;
                    *plane_interleaved_uv++ = MAKE_U(r, g, b);
                    *plane_interleaved_uv++ = MAKE_V(r, g, b);
                }
                plane_interleaved_uv += uv_skip;
                curr_row += src_pitch_x_2;
                next_row += src_pitch_x_2;
            }
            if (height_remainder) {
                for (i = 0; i < width_half; i++) {
                    READ_1x2_PIXELS;
                    *plane_interleaved_uv++ = MAKE_U(r, g, b);
                    *plane_interleaved_uv++ = MAKE_V(r, g, b);
                }
                if (width_remainder) {
                    READ_1x1_PIXEL;
                    *plane_interleaved_uv++ = MAKE_U(r, g, b);
                    *plane_interleaved_uv++ = MAKE_V(r, g, b);
                }
            }
        } else /* dst_format == SDL_PIXELFORMAT_NV21 */ {
            uv_skip = (uv_stride - ((width + 1) / 2) * 2);
            for (j = 0; j < height_half; j++) {
                for (i = 0; i < width_half; i++) {
                    READ_2x2_PIXELS;
                    *plane_interleaved_uv++ = MAKE_V(r, g, b);
                    *plane_interleaved_uv++ = MAKE_U(r, g, b);
                }
                if (width_remainder) {
                    READ_2x1_PIXELS;
                    *plane_interleaved_uv++ = MAKE_V(r, g, b);
                    *plane_interleaved_uv++ = MAKE_U(r, g, b);
                }
                plane_interleaved_uv += uv_skip;
                curr_row += src_pitch_x_2;
                next_row += src_pitch_x_2;
            }
            if (height_remainder) {
                for (i = 0; i < width_half; i++) {
                    READ_1x2_PIXELS;
                    *plane_interleaved_uv++ = MAKE_V(r, g, b);
                    *plane_interleaved_uv++ = MAKE_U(r, g, b);
                }
                if (width_remainder) {
                    READ_1x1_PIXEL;
                    *plane_interleaved_uv++ = MAKE_V(r, g, b);
                    *plane_interleaved_uv++ = MAKE_U(r, g, b);
                }
            }
        }
    } break;

    case SDL_PIXELFORMAT_YUY2:
    case SDL_PIXELFORMAT_UYVY:
    case SDL_PIXELFORMAT_YVYU:
    {
        const Uint8 *curr_row = (const Uint8 *)src;
        Uint8 *plane = (Uint8 *)dst;
        const int row_size = (4 * ((width + 1) / 2));
        int plane_skip;

        if (dst_pitch < row_size) {
            return SDL_SetError("Destination pitch is too small, expected at least %d", row_size);
        }
        plane_skip = (dst_pitch - row_size);

        // Write YUV plane, packed
        if (dst_format == SDL_PIXELFORMAT_YUY2) {
            for (j = 0; j < height; j++) {
                for (i = 0; i < width_half; i++) {
                    READ_TWO_RGB_PIXELS;
                    // Y U Y1 V
                    *plane++ = MAKE_Y(r, g, b);
                    *plane++ = MAKE_U(R, G, B);
                    *plane++ = MAKE_Y(r1, g1, b1);
                    *plane++ = MAKE_V(R, G, B);
                }
                if (width_remainder) {
                    READ_ONE_RGB_PIXEL;
                    // Y U Y V
                    *plane++ = MAKE_Y(r, g, b);
                    *plane++ = MAKE_U(r, g, b);
                    *plane++ = MAKE_Y(r, g, b);
                    *plane++ = MAKE_V(r, g, b);
                }
                plane += plane_skip;
                curr_row += src_pitch;
            }
        } else if (dst_format == SDL_PIXELFORMAT_UYVY) {
            for (j = 0; j < height; j++) {
                for (i = 0; i < width_half; i++) {
                    READ_TWO_RGB_PIXELS;
                    // U Y V Y1
                    *plane++ = MAKE_U(R, G, B);
                    *plane++ = MAKE_Y(r, g, b);
                    *plane++ = MAKE_V(R, G, B);
                    *plane++ = MAKE_Y(r1, g1, b1);
                }
                if (width_remainder) {
                    READ_ONE_RGB_PIXEL;
                    // U Y V Y
                    *plane++ = MAKE_U(r, g, b);
                    *plane++ = MAKE_Y(r, g, b);
                    *plane++ = MAKE_V(r, g, b);
                    *plane++ = MAKE_Y(r, g, b);
                }
                plane += plane_skip;
                curr_row += src_pitch;
            }
        } else if (dst_format == SDL_PIXELFORMAT_YVYU) {
            for (j = 0; j < height; j++) {
                for (i = 0; i < width_half; i++) {
                    READ_TWO_RGB_PIXELS;
                    // Y V Y1 U
                    *plane++ = MAKE_Y(r, g, b);
                    *plane++ = MAKE_V(R, G, B);
                    *plane++ = MAKE_Y(r1, g1, b1);
                    *plane++ = MAKE_U(R, G, B);
                }
                if (width_remainder) {
                    READ_ONE_RGB_PIXEL;
                    // Y V Y U
                    *plane++ = MAKE_Y(r, g, b);
                    *plane++ = MAKE_V(r, g, b);
                    *plane++ = MAKE_Y(r, g, b);
                    *plane++ = MAKE_U(r, g, b);
                }
                plane += plane_skip;
                curr_row += src_pitch;
            }
        }
    } break;

    default:
        return SDL_SetError("Unsupported YUV destination format: %s", SDL_GetPixelFormatName(dst_format));
    }
#undef MAKE_Y
#undef MAKE_U
#undef MAKE_V
#undef READ_2x2_PIXELS
#undef READ_2x1_PIXELS
#undef READ_1x2_PIXELS
#undef READ_1x1_PIXEL
#undef READ_TWO_RGB_PIXELS
#undef READ_ONE_RGB_PIXEL
    return true;
}

static bool SDL_ConvertPixels_XBGR2101010_to_P010(int width, int height, const void *src, int src_pitch, SDL_PixelFormat dst_format, void *dst, int dst_pitch, YCbCrType yuv_type)
{
    const int src_pitch_x_2 = src_pitch * 2;
    const int height_half = height / 2;
    const int height_remainder = (height & 0x1);
    const int width_half = width / 2;
    const int width_remainder = (width & 0x1);
    int i, j;

    const struct RGB2YUVFactors *cvt = &RGB2YUVFactorTables[yuv_type];

#define MAKE_Y(r, g, b) (Uint16)(((int)(cvt->y[0] * (r) + cvt->y[1] * (g) + cvt->y[2] * (b) + 0.5f) + cvt->y_offset) << 6)
#define MAKE_U(r, g, b) (Uint16)(((int)(cvt->u[0] * (r) + cvt->u[1] * (g) + cvt->u[2] * (b) + 0.5f) + 512) << 6)
#define MAKE_V(r, g, b) (Uint16)(((int)(cvt->v[0] * (r) + cvt->v[1] * (g) + cvt->v[2] * (b) + 0.5f) + 512) << 6)

#define READ_2x2_PIXELS                                                                                     \
    const Uint32 p1 = ((const Uint32 *)curr_row)[2 * i];                                                    \
    const Uint32 p2 = ((const Uint32 *)curr_row)[2 * i + 1];                                                \
    const Uint32 p3 = ((const Uint32 *)next_row)[2 * i];                                                    \
    const Uint32 p4 = ((const Uint32 *)next_row)[2 * i + 1];                                                \
    const Uint32 r = ((p1 & 0x000003ff) + (p2 & 0x000003ff) + (p3 & 0x000003ff) + (p4 & 0x000003ff)) >> 2;  \
    const Uint32 g = ((p1 & 0x000ffc00) + (p2 & 0x000ffc00) + (p3 & 0x000ffc00) + (p4 & 0x000ffc00)) >> 12; \
    const Uint32 b = ((p1 & 0x3ff00000) + (p2 & 0x3ff00000) + (p3 & 0x3ff00000) + (p4 & 0x3ff00000)) >> 22;

#define READ_2x1_PIXELS                                             \
    const Uint32 p1 = ((const Uint32 *)curr_row)[2 * i];            \
    const Uint32 p2 = ((const Uint32 *)next_row)[2 * i];            \
    const Uint32 r = ((p1 & 0x000003ff) + (p2 & 0x000003ff)) >> 1;  \
    const Uint32 g = ((p1 & 0x000ffc00) + (p2 & 0x000ffc00)) >> 11; \
    const Uint32 b = ((p1 & 0x3ff00000) + (p2 & 0x3ff00000)) >> 21;

#define READ_1x2_PIXELS                                             \
    const Uint32 p1 = ((const Uint32 *)curr_row)[2 * i];            \
    const Uint32 p2 = ((const Uint32 *)curr_row)[2 * i + 1];        \
    const Uint32 r = ((p1 & 0x000003ff) + (p2 & 0x000003ff)) >> 1;  \
    const Uint32 g = ((p1 & 0x000ffc00) + (p2 & 0x000ffc00)) >> 11; \
    const Uint32 b = ((p1 & 0x3ff00000) + (p2 & 0x3ff00000)) >> 21;

#define READ_1x1_PIXEL                                  \
    const Uint32 p = ((const Uint32 *)curr_row)[2 * i]; \
    const Uint32 r = (p & 0x000003ff);                  \
    const Uint32 g = (p & 0x000ffc00) >> 10;            \
    const Uint32 b = (p & 0x3ff00000) >> 20;

    const Uint8 *curr_row, *next_row;

    Uint16 *plane_y;
    Uint16 *plane_u;
    Uint16 *plane_v;
    Uint16 *plane_interleaved_uv;
    Uint32 y_stride, uv_stride, y_skip, uv_skip;

    if (!GetYUVPlanes(width, height, dst_format, dst, dst_pitch,
                      (const Uint8 **)&plane_y, (const Uint8 **)&plane_u, (const Uint8 **)&plane_v,
                      &y_stride, &uv_stride)) {
        return false;
    }

    y_stride /= sizeof(Uint16);
    uv_stride /= sizeof(Uint16);

    plane_interleaved_uv = (plane_y + height * y_stride);
    y_skip = (y_stride - width);

    curr_row = (const Uint8 *)src;

    // Write Y plane
    for (j = 0; j < height; j++) {
        for (i = 0; i < width; i++) {
            const Uint32 p1 = ((const Uint32 *)curr_row)[i];
            const Uint32 r = (p1 >>  0) & 0x03ff;
            const Uint32 g = (p1 >> 10) & 0x03ff;
            const Uint32 b = (p1 >> 20) & 0x03ff;
            *plane_y++ = MAKE_Y(r, g, b);
        }
        plane_y += y_skip;
        curr_row += src_pitch;
    }

    curr_row = (const Uint8 *)src;
    next_row = (const Uint8 *)src;
    next_row += src_pitch;

    uv_skip = (uv_stride - ((width + 1) / 2) * 2);
    for (j = 0; j < height_half; j++) {
        for (i = 0; i < width_half; i++) {
            READ_2x2_PIXELS;
            *plane_interleaved_uv++ = MAKE_U(r, g, b);
            *plane_interleaved_uv++ = MAKE_V(r, g, b);
        }
        if (width_remainder) {
            READ_2x1_PIXELS;
            *plane_interleaved_uv++ = MAKE_U(r, g, b);
            *plane_interleaved_uv++ = MAKE_V(r, g, b);
        }
        plane_interleaved_uv += uv_skip;
        curr_row += src_pitch_x_2;
        next_row += src_pitch_x_2;
    }
    if (height_remainder) {
        for (i = 0; i < width_half; i++) {
            READ_1x2_PIXELS;
            *plane_interleaved_uv++ = MAKE_U(r, g, b);
            *plane_interleaved_uv++ = MAKE_V(r, g, b);
        }
        if (width_remainder) {
            READ_1x1_PIXEL;
            *plane_interleaved_uv++ = MAKE_U(r, g, b);
            *plane_interleaved_uv++ = MAKE_V(r, g, b);
        }
    }

#undef MAKE_Y
#undef MAKE_U
#undef MAKE_V
#undef READ_2x2_PIXELS
#undef READ_2x1_PIXELS
#undef READ_1x2_PIXELS
#undef READ_1x1_PIXEL
    return true;
}

bool SDL_ConvertPixels_RGB_to_YUV(int width, int height,
                                  SDL_PixelFormat src_format, SDL_Colorspace src_colorspace, SDL_PropertiesID src_properties, const void *src, int src_pitch,
                                  SDL_PixelFormat dst_format, SDL_Colorspace dst_colorspace, SDL_PropertiesID dst_properties, void *dst, int dst_pitch)
{
    YCbCrType yuv_type = YCBCR_601_LIMITED;

    if (!GetYUVConversionType(dst_colorspace, &yuv_type)) {
        return false;
    }

#if 0 // Doesn't handle odd widths
    // RGB24 to FOURCC
    if (src_format == SDL_PIXELFORMAT_RGB24) {
        Uint8 *y;
        Uint8 *u;
        Uint8 *v;
        Uint32 y_stride;
        Uint32 uv_stride;

        if (GetYUVPlanes(width, height, dst_format, dst, dst_pitch, (const Uint8 **)&y, (const Uint8 **)&u, (const Uint8 **)&v, &y_stride, &uv_stride) < 0) {
            return false;
        }

        rgb24_yuv420_std(width, height, src, src_pitch, y, u, v, y_stride, uv_stride, yuv_type);
        return true;
    }
#endif

    // ARGB8888 to FOURCC
    if (src_format == SDL_PIXELFORMAT_ARGB8888 || src_format == SDL_PIXELFORMAT_XRGB8888) {
        return SDL_ConvertPixels_XRGB8888_to_YUV(width, height, src, src_pitch, dst_format, dst, dst_pitch, yuv_type);
    }

    if (dst_format == SDL_PIXELFORMAT_P010) {
        if (src_format == SDL_PIXELFORMAT_XBGR2101010) {
            return SDL_ConvertPixels_XBGR2101010_to_P010(width, height, src, src_pitch, dst_format, dst, dst_pitch, yuv_type);
        }

        // We currently only support converting from XBGR2101010 to P010
        bool result;
        void *tmp;
        int tmp_pitch = (width * sizeof(Uint32));

        tmp = SDL_malloc((size_t)tmp_pitch * height);
        if (!tmp) {
            return false;
        }

        // convert src/src_format to tmp/XBGR2101010
        result = SDL_ConvertPixelsAndColorspace(width, height, src_format, src_colorspace, src_properties, src, src_pitch, SDL_PIXELFORMAT_XBGR2101010, dst_colorspace, dst_properties, tmp, tmp_pitch);
        if (!result) {
            SDL_free(tmp);
            return false;
        }

        // convert tmp/XBGR2101010 to dst/P010
        result = SDL_ConvertPixels_XBGR2101010_to_P010(width, height, tmp, tmp_pitch, dst_format, dst, dst_pitch, yuv_type);
        SDL_free(tmp);
        return result;
    }

    // not ARGB8888 to FOURCC : need an intermediate conversion
    {
        bool result;
        void *tmp;
        int tmp_pitch = (width * sizeof(Uint32));

        tmp = SDL_malloc((size_t)tmp_pitch * height);
        if (!tmp) {
            return false;
        }

        // convert src/src_format to tmp/XRGB8888
        result = SDL_ConvertPixelsAndColorspace(width, height, src_format, src_colorspace, src_properties, src, src_pitch, SDL_PIXELFORMAT_XRGB8888, SDL_COLORSPACE_SRGB, 0, tmp, tmp_pitch);
        if (!result) {
            SDL_free(tmp);
            return false;
        }

        // convert tmp/XRGB8888 to dst/FOURCC
        result = SDL_ConvertPixels_XRGB8888_to_YUV(width, height, tmp, tmp_pitch, dst_format, dst, dst_pitch, yuv_type);
        SDL_free(tmp);
        return result;
    }
}

static bool SDL_ConvertPixels_YUV_to_YUV_Copy(int width, int height, SDL_PixelFormat format, const void *src, int src_pitch, void *dst, int dst_pitch)
{
    int i;

    if (IsPlanar2x2Format(format)) {
        // Y plane
        for (i = height; i--;) {
            SDL_memcpy(dst, src, width);
            src = (const Uint8 *)src + src_pitch;
            dst = (Uint8 *)dst + dst_pitch;
        }

        if (format == SDL_PIXELFORMAT_YV12 || format == SDL_PIXELFORMAT_IYUV) {
            // U and V planes are a quarter the size of the Y plane, rounded up
            width = (width + 1) / 2;
            height = (height + 1) / 2;
            src_pitch = (src_pitch + 1) / 2;
            dst_pitch = (dst_pitch + 1) / 2;
            for (i = height * 2; i--;) {
                SDL_memcpy(dst, src, width);
                src = (const Uint8 *)src + src_pitch;
                dst = (Uint8 *)dst + dst_pitch;
            }
        } else if (format == SDL_PIXELFORMAT_NV12 || format == SDL_PIXELFORMAT_NV21) {
            // U/V plane is half the height of the Y plane, rounded up
            height = (height + 1) / 2;
            width = ((width + 1) / 2) * 2;
            src_pitch = ((src_pitch + 1) / 2) * 2;
            dst_pitch = ((dst_pitch + 1) / 2) * 2;
            for (i = height; i--;) {
                SDL_memcpy(dst, src, width);
                src = (const Uint8 *)src + src_pitch;
                dst = (Uint8 *)dst + dst_pitch;
            }
        } else if (format == SDL_PIXELFORMAT_P010) {
            // U/V plane is half the height of the Y plane, rounded up
            height = (height + 1) / 2;
            width = ((width + 1) / 2) * 2;
            src_pitch = ((src_pitch + 1) / 2) * 2;
            dst_pitch = ((dst_pitch + 1) / 2) * 2;
            for (i = height; i--;) {
                SDL_memcpy(dst, src, width * sizeof(Uint16));
                src = (const Uint8 *)src + src_pitch;
                dst = (Uint8 *)dst + dst_pitch;
            }
        }
        return true;
    }

    if (IsPacked4Format(format)) {
        // Packed planes
        width = 4 * ((width + 1) / 2);
        for (i = height; i--;) {
            SDL_memcpy(dst, src, width);
            src = (const Uint8 *)src + src_pitch;
            dst = (Uint8 *)dst + dst_pitch;
        }
        return true;
    }

    return SDL_SetError("SDL_ConvertPixels_YUV_to_YUV_Copy: Unsupported YUV format: %s", SDL_GetPixelFormatName(format));
}

static bool SDL_ConvertPixels_SwapUVPlanes(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
    int y;
    const int UVwidth = (width + 1) / 2;
    const int UVheight = (height + 1) / 2;

    // Skip the Y plane
    src = (const Uint8 *)src + height * src_pitch;
    dst = (Uint8 *)dst + height * dst_pitch;

    if (src == dst) {
        int UVpitch = (dst_pitch + 1) / 2;
        Uint8 *tmp;
        Uint8 *row1 = (Uint8 *)dst;
        Uint8 *row2 = row1 + UVheight * UVpitch;

        // Allocate a temporary row for the swap
        tmp = (Uint8 *)SDL_malloc(UVwidth);
        if (!tmp) {
            return false;
        }
        for (y = 0; y < UVheight; ++y) {
            SDL_memcpy(tmp, row1, UVwidth);
            SDL_memcpy(row1, row2, UVwidth);
            SDL_memcpy(row2, tmp, UVwidth);
            row1 += UVpitch;
            row2 += UVpitch;
        }
        SDL_free(tmp);
    } else {
        const Uint8 *srcUV;
        Uint8 *dstUV;
        int srcUVPitch = ((src_pitch + 1) / 2);
        int dstUVPitch = ((dst_pitch + 1) / 2);

        // Copy the first plane
        srcUV = (const Uint8 *)src;
        dstUV = (Uint8 *)dst + UVheight * dstUVPitch;
        for (y = 0; y < UVheight; ++y) {
            SDL_memcpy(dstUV, srcUV, UVwidth);
            srcUV += srcUVPitch;
            dstUV += dstUVPitch;
        }

        // Copy the second plane
        dstUV = (Uint8 *)dst;
        for (y = 0; y < UVheight; ++y) {
            SDL_memcpy(dstUV, srcUV, UVwidth);
            srcUV += srcUVPitch;
            dstUV += dstUVPitch;
        }
    }
    return true;
}

#ifdef SDL_SSE2_INTRINSICS
static bool SDL_TARGETING("sse2") SDL_ConvertPixels_PackUVPlanes_to_NV_SSE2(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch, bool reverseUV)
{
    int x, y;
    const int UVwidth = (width + 1) / 2;
    const int UVheight = (height + 1) / 2;
    const int srcUVPitch = ((src_pitch + 1) / 2);
    const int srcUVPitchLeft = srcUVPitch - UVwidth;
    const int dstUVPitch = ((dst_pitch + 1) / 2) * 2;
    const int dstUVPitchLeft = dstUVPitch - UVwidth * 2;
    const Uint8 *src1, *src2;
    Uint8 *dstUV;
    Uint8 *tmp = NULL;

    // Skip the Y plane
    src = (const Uint8 *)src + height * src_pitch;
    dst = (Uint8 *)dst + height * dst_pitch;

    if (src == dst) {
        // Need to make a copy of the buffer so we don't clobber it while converting
        tmp = (Uint8 *)SDL_malloc((size_t)2 * UVheight * srcUVPitch);
        if (tmp == NULL) {
            return false;
        }
        SDL_memcpy(tmp, src, (size_t)2 * UVheight * srcUVPitch);
        src = tmp;
    }

    if (reverseUV) {
        src2 = (const Uint8 *)src;
        src1 = src2 + UVheight * srcUVPitch;
    } else {
        src1 = (const Uint8 *)src;
        src2 = src1 + UVheight * srcUVPitch;
    }
    dstUV = (Uint8 *)dst;

    y = UVheight;
    while (y--) {
        x = UVwidth;
        while (x >= 16) {
            __m128i u = _mm_loadu_si128((__m128i *)src1);
            __m128i v = _mm_loadu_si128((__m128i *)src2);
            __m128i uv1 = _mm_unpacklo_epi8(u, v);
            __m128i uv2 = _mm_unpackhi_epi8(u, v);
            _mm_storeu_si128((__m128i *)dstUV, uv1);
            _mm_storeu_si128((__m128i *)(dstUV + 16), uv2);
            src1 += 16;
            src2 += 16;
            dstUV += 32;
            x -= 16;
        }
        while (x--) {
            *dstUV++ = *src1++;
            *dstUV++ = *src2++;
        }
        src1 += srcUVPitchLeft;
        src2 += srcUVPitchLeft;
        dstUV += dstUVPitchLeft;
    }

    if (tmp) {
        SDL_free(tmp);
    }
    return true;
}

static bool SDL_TARGETING("sse2") SDL_ConvertPixels_SplitNV_to_UVPlanes_SSE2(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch, bool reverseUV)
{
    int x, y;
    const int UVwidth = (width + 1) / 2;
    const int UVheight = (height + 1) / 2;
    const int srcUVPitch = ((src_pitch + 1) / 2) * 2;
    const int srcUVPitchLeft = srcUVPitch - UVwidth * 2;
    const int dstUVPitch = ((dst_pitch + 1) / 2);
    const int dstUVPitchLeft = dstUVPitch - UVwidth;
    const Uint8 *srcUV;
    Uint8 *dst1, *dst2;
    Uint8 *tmp = NULL;

    // Skip the Y plane
    src = (const Uint8 *)src + height * src_pitch;
    dst = (Uint8 *)dst + height * dst_pitch;

    if (src == dst) {
        // Need to make a copy of the buffer so we don't clobber it while converting
        tmp = (Uint8 *)SDL_malloc((size_t)UVheight * srcUVPitch);
        if (tmp == NULL) {
            return false;
        }
        SDL_memcpy(tmp, src, (size_t)UVheight * srcUVPitch);
        src = tmp;
    }

    if (reverseUV) {
        dst2 = (Uint8 *)dst;
        dst1 = dst2 + UVheight * dstUVPitch;
    } else {
        dst1 = (Uint8 *)dst;
        dst2 = dst1 + UVheight * dstUVPitch;
    }
    srcUV = (const Uint8 *)src;

    y = UVheight;
    while (y--) {
        __m128i mask = _mm_set1_epi16(0x00FF);
        x = UVwidth;
        while (x >= 16) {
            __m128i uv1 = _mm_loadu_si128((__m128i *)srcUV);
            __m128i uv2 = _mm_loadu_si128((__m128i *)(srcUV + 16));
            __m128i u1 = _mm_and_si128(uv1, mask);
            __m128i u2 = _mm_and_si128(uv2, mask);
            __m128i u = _mm_packus_epi16(u1, u2);
            __m128i v1 = _mm_srli_epi16(uv1, 8);
            __m128i v2 = _mm_srli_epi16(uv2, 8);
            __m128i v = _mm_packus_epi16(v1, v2);
            _mm_storeu_si128((__m128i *)dst1, u);
            _mm_storeu_si128((__m128i *)dst2, v);
            srcUV += 32;
            dst1 += 16;
            dst2 += 16;
            x -= 16;
        }
        while (x--) {
            *dst1++ = *srcUV++;
            *dst2++ = *srcUV++;
        }
        srcUV += srcUVPitchLeft;
        dst1 += dstUVPitchLeft;
        dst2 += dstUVPitchLeft;
    }

    if (tmp) {
        SDL_free(tmp);
    }
    return true;
}

static bool SDL_TARGETING("sse2") SDL_ConvertPixels_SwapNV_SSE2(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
    int x, y;
    const int UVwidth = (width + 1) / 2;
    const int UVheight = (height + 1) / 2;
    const int srcUVPitch = ((src_pitch + 1) / 2) * 2;
    const int srcUVPitchLeft = (srcUVPitch - UVwidth * 2) / sizeof(Uint16);
    const int dstUVPitch = ((dst_pitch + 1) / 2) * 2;
    const int dstUVPitchLeft = (dstUVPitch - UVwidth * 2) / sizeof(Uint16);
    const Uint16 *srcUV;
    Uint16 *dstUV;

    // Skip the Y plane
    src = (const Uint8 *)src + height * src_pitch;
    dst = (Uint8 *)dst + height * dst_pitch;

    srcUV = (const Uint16 *)src;
    dstUV = (Uint16 *)dst;
    y = UVheight;
    while (y--) {
        x = UVwidth;
        while (x >= 8) {
            __m128i uv = _mm_loadu_si128((__m128i *)srcUV);
            __m128i v = _mm_slli_epi16(uv, 8);
            __m128i u = _mm_srli_epi16(uv, 8);
            __m128i vu = _mm_or_si128(v, u);
            _mm_storeu_si128((__m128i *)dstUV, vu);
            srcUV += 8;
            dstUV += 8;
            x -= 8;
        }
        while (x--) {
            *dstUV++ = SDL_Swap16(*srcUV++);
        }
        srcUV += srcUVPitchLeft;
        dstUV += dstUVPitchLeft;
    }
    return true;
}
#endif

static bool SDL_ConvertPixels_PackUVPlanes_to_NV_std(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch, bool reverseUV)
{
    int x, y;
    const int UVwidth = (width + 1) / 2;
    const int UVheight = (height + 1) / 2;
    const int srcUVPitch = ((src_pitch + 1) / 2);
    const int srcUVPitchLeft = srcUVPitch - UVwidth;
    const int dstUVPitch = ((dst_pitch + 1) / 2) * 2;
    const int dstUVPitchLeft = dstUVPitch - UVwidth * 2;
    const Uint8 *src1, *src2;
    Uint8 *dstUV;
    Uint8 *tmp = NULL;

    // Skip the Y plane
    src = (const Uint8 *)src + height * src_pitch;
    dst = (Uint8 *)dst + height * dst_pitch;

    if (src == dst) {
        // Need to make a copy of the buffer so we don't clobber it while converting
        tmp = (Uint8 *)SDL_malloc((size_t)2 * UVheight * srcUVPitch);
        if (!tmp) {
            return false;
        }
        SDL_memcpy(tmp, src, (size_t)2 * UVheight * srcUVPitch);
        src = tmp;
    }

    if (reverseUV) {
        src2 = (const Uint8 *)src;
        src1 = src2 + UVheight * srcUVPitch;
    } else {
        src1 = (const Uint8 *)src;
        src2 = src1 + UVheight * srcUVPitch;
    }
    dstUV = (Uint8 *)dst;

    y = UVheight;
    while (y--) {
        x = UVwidth;
        while (x--) {
            *dstUV++ = *src1++;
            *dstUV++ = *src2++;
        }
        src1 += srcUVPitchLeft;
        src2 += srcUVPitchLeft;
        dstUV += dstUVPitchLeft;
    }

    SDL_free(tmp);
    return true;
}

static bool SDL_ConvertPixels_SplitNV_to_UVPlanes_std(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch, bool reverseUV)
{
    int x, y;
    const int UVwidth = (width + 1) / 2;
    const int UVheight = (height + 1) / 2;
    const int srcUVPitch = ((src_pitch + 1) / 2) * 2;
    const int srcUVPitchLeft = srcUVPitch - UVwidth * 2;
    const int dstUVPitch = ((dst_pitch + 1) / 2);
    const int dstUVPitchLeft = dstUVPitch - UVwidth;
    const Uint8 *srcUV;
    Uint8 *dst1, *dst2;
    Uint8 *tmp = NULL;

    // Skip the Y plane
    src = (const Uint8 *)src + height * src_pitch;
    dst = (Uint8 *)dst + height * dst_pitch;

    if (src == dst) {
        // Need to make a copy of the buffer so we don't clobber it while converting
        tmp = (Uint8 *)SDL_malloc((size_t)UVheight * srcUVPitch);
        if (!tmp) {
            return false;
        }
        SDL_memcpy(tmp, src, (size_t)UVheight * srcUVPitch);
        src = tmp;
    }

    if (reverseUV) {
        dst2 = (Uint8 *)dst;
        dst1 = dst2 + UVheight * dstUVPitch;
    } else {
        dst1 = (Uint8 *)dst;
        dst2 = dst1 + UVheight * dstUVPitch;
    }
    srcUV = (const Uint8 *)src;

    y = UVheight;
    while (y--) {
        x = UVwidth;
        while (x--) {
            *dst1++ = *srcUV++;
            *dst2++ = *srcUV++;
        }
        srcUV += srcUVPitchLeft;
        dst1 += dstUVPitchLeft;
        dst2 += dstUVPitchLeft;
    }

    SDL_free(tmp);
    return true;
}

static bool SDL_ConvertPixels_SwapNV_std(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
    int x, y;
    const int UVwidth = (width + 1) / 2;
    const int UVheight = (height + 1) / 2;
    const int srcUVPitch = ((src_pitch + 1) / 2) * 2;
    const int dstUVPitch = ((dst_pitch + 1) / 2) * 2;

    // Skip the Y plane
    src = (const Uint8 *)src + height * src_pitch;
    dst = (Uint8 *)dst + height * dst_pitch;

    bool aligned = (((uintptr_t)src | (uintptr_t)dst) & 1) == 0;
    if (aligned) {
        const int srcUVPitchLeft = (srcUVPitch - UVwidth * 2) / sizeof(Uint16);
        const int dstUVPitchLeft = (dstUVPitch - UVwidth * 2) / sizeof(Uint16);
        const Uint16 *srcUV = (const Uint16 *)src;
        Uint16 *dstUV = (Uint16 *)dst;
        y = UVheight;
        while (y--) {
            x = UVwidth;
            while (x--) {
                *dstUV++ = SDL_Swap16(*srcUV++);
            }
            srcUV += srcUVPitchLeft;
            dstUV += dstUVPitchLeft;
        }
    } else {
        const int srcUVPitchLeft = (srcUVPitch - UVwidth * 2);
        const int dstUVPitchLeft = (dstUVPitch - UVwidth * 2);
        const Uint8 *srcUV = (const Uint8 *)src;
        Uint8 *dstUV = (Uint8 *)dst;
        y = UVheight;
        while (y--) {
            x = UVwidth;
            while (x--) {
                Uint8 u = *srcUV++;
                Uint8 v = *srcUV++;
                *dstUV++ = v;
                *dstUV++ = u;
            }
            srcUV += srcUVPitchLeft;
            dstUV += dstUVPitchLeft;
        }
    }
    return true;
}

static bool SDL_ConvertPixels_PackUVPlanes_to_NV(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch, bool reverseUV)
{
#ifdef SDL_SSE2_INTRINSICS
    if (SDL_HasSSE2()) {
      return SDL_ConvertPixels_PackUVPlanes_to_NV_SSE2(width, height, src, src_pitch, dst, dst_pitch, reverseUV);
    }
#endif
    return SDL_ConvertPixels_PackUVPlanes_to_NV_std(width, height, src, src_pitch, dst, dst_pitch, reverseUV);
}

static bool SDL_ConvertPixels_SplitNV_to_UVPlanes(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch, bool reverseUV)
{
#ifdef SDL_SSE2_INTRINSICS
    if (SDL_HasSSE2()) {
      return SDL_ConvertPixels_SplitNV_to_UVPlanes_SSE2(width, height, src, src_pitch, dst, dst_pitch, reverseUV);
    }
#endif
    return SDL_ConvertPixels_SplitNV_to_UVPlanes_std(width, height, src, src_pitch, dst, dst_pitch, reverseUV);
}

static bool SDL_ConvertPixels_SwapNV(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
#ifdef SDL_SSE2_INTRINSICS
    if (SDL_HasSSE2()) {
      return SDL_ConvertPixels_SwapNV_SSE2(width, height, src, src_pitch, dst, dst_pitch);
    }
#endif
    return SDL_ConvertPixels_SwapNV_std(width, height, src, src_pitch, dst, dst_pitch);
}

static bool SDL_ConvertPixels_Planar2x2_to_Planar2x2(int width, int height,
                                                     SDL_PixelFormat src_format, const void *src, int src_pitch,
                                                     SDL_PixelFormat dst_format, void *dst, int dst_pitch)
{
    if (src != dst) {
        // Copy Y plane
        int i;
        const Uint8 *srcY = (const Uint8 *)src;
        Uint8 *dstY = (Uint8 *)dst;
        for (i = height; i--;) {
            SDL_memcpy(dstY, srcY, width);
            srcY += src_pitch;
            dstY += dst_pitch;
        }
    }

    switch (src_format) {
    case SDL_PIXELFORMAT_YV12:
        switch (dst_format) {
        case SDL_PIXELFORMAT_IYUV:
            return SDL_ConvertPixels_SwapUVPlanes(width, height, src, src_pitch, dst, dst_pitch);
        case SDL_PIXELFORMAT_NV12:
            return SDL_ConvertPixels_PackUVPlanes_to_NV(width, height, src, src_pitch, dst, dst_pitch, true);
        case SDL_PIXELFORMAT_NV21:
            return SDL_ConvertPixels_PackUVPlanes_to_NV(width, height, src, src_pitch, dst, dst_pitch, false);
        default:
            break;
        }
        break;
    case SDL_PIXELFORMAT_IYUV:
        switch (dst_format) {
        case SDL_PIXELFORMAT_YV12:
            return SDL_ConvertPixels_SwapUVPlanes(width, height, src, src_pitch, dst, dst_pitch);
        case SDL_PIXELFORMAT_NV12:
            return SDL_ConvertPixels_PackUVPlanes_to_NV(width, height, src, src_pitch, dst, dst_pitch, false);
        case SDL_PIXELFORMAT_NV21:
            return SDL_ConvertPixels_PackUVPlanes_to_NV(width, height, src, src_pitch, dst, dst_pitch, true);
        default:
            break;
        }
        break;
    case SDL_PIXELFORMAT_NV12:
        switch (dst_format) {
        case SDL_PIXELFORMAT_YV12:
            return SDL_ConvertPixels_SplitNV_to_UVPlanes(width, height, src, src_pitch, dst, dst_pitch, true);
        case SDL_PIXELFORMAT_IYUV:
            return SDL_ConvertPixels_SplitNV_to_UVPlanes(width, height, src, src_pitch, dst, dst_pitch, false);
        case SDL_PIXELFORMAT_NV21:
            return SDL_ConvertPixels_SwapNV(width, height, src, src_pitch, dst, dst_pitch);
        default:
            break;
        }
        break;
    case SDL_PIXELFORMAT_NV21:
        switch (dst_format) {
        case SDL_PIXELFORMAT_YV12:
            return SDL_ConvertPixels_SplitNV_to_UVPlanes(width, height, src, src_pitch, dst, dst_pitch, false);
        case SDL_PIXELFORMAT_IYUV:
            return SDL_ConvertPixels_SplitNV_to_UVPlanes(width, height, src, src_pitch, dst, dst_pitch, true);
        case SDL_PIXELFORMAT_NV12:
            return SDL_ConvertPixels_SwapNV(width, height, src, src_pitch, dst, dst_pitch);
        default:
            break;
        }
        break;
    default:
        break;
    }
    return SDL_SetError("SDL_ConvertPixels_Planar2x2_to_Planar2x2: Unsupported YUV conversion: %s -> %s", SDL_GetPixelFormatName(src_format),
                        SDL_GetPixelFormatName(dst_format));
}

#ifdef SDL_SSE2_INTRINSICS
#define PACKED4_TO_PACKED4_ROW_SSE2(shuffle)                      \
    while (x >= 4) {                                              \
        __m128i yuv = _mm_loadu_si128((__m128i *)srcYUV);         \
        __m128i lo = _mm_unpacklo_epi8(yuv, _mm_setzero_si128()); \
        __m128i hi = _mm_unpackhi_epi8(yuv, _mm_setzero_si128()); \
        lo = _mm_shufflelo_epi16(lo, shuffle);                    \
        lo = _mm_shufflehi_epi16(lo, shuffle);                    \
        hi = _mm_shufflelo_epi16(hi, shuffle);                    \
        hi = _mm_shufflehi_epi16(hi, shuffle);                    \
        yuv = _mm_packus_epi16(lo, hi);                           \
        _mm_storeu_si128((__m128i *)dstYUV, yuv);                 \
        srcYUV += 16;                                             \
        dstYUV += 16;                                             \
        x -= 4;                                                   \
    }

static bool SDL_TARGETING("sse2") SDL_ConvertPixels_YUY2_to_UYVY_SSE2(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
    int x, y;
    const int YUVwidth = (width + 1) / 2;
    const int srcYUVPitchLeft = (src_pitch - YUVwidth * 4);
    const int dstYUVPitchLeft = (dst_pitch - YUVwidth * 4);
    const Uint8 *srcYUV = (const Uint8 *)src;
    Uint8 *dstYUV = (Uint8 *)dst;

    y = height;
    x = YUVwidth;
    while (y--) {
        PACKED4_TO_PACKED4_ROW_SSE2(_MM_SHUFFLE(2, 3, 0, 1));
        while (x--) {
            Uint8 Y1, U, Y2, V;

            Y1 = srcYUV[0];
            U = srcYUV[1];
            Y2 = srcYUV[2];
            V = srcYUV[3];
            srcYUV += 4;

            dstYUV[0] = U;
            dstYUV[1] = Y1;
            dstYUV[2] = V;
            dstYUV[3] = Y2;
            dstYUV += 4;
        }
        srcYUV += srcYUVPitchLeft;
        dstYUV += dstYUVPitchLeft;
        x = YUVwidth;
    }
    return true;
}

static bool SDL_TARGETING("sse2") SDL_ConvertPixels_YUY2_to_YVYU_SSE2(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
    int x, y;
    const int YUVwidth = (width + 1) / 2;
    const int srcYUVPitchLeft = (src_pitch - YUVwidth * 4);
    const int dstYUVPitchLeft = (dst_pitch - YUVwidth * 4);
    const Uint8 *srcYUV = (const Uint8 *)src;
    Uint8 *dstYUV = (Uint8 *)dst;

    y = height;
    x = YUVwidth;
    while (y--) {
        PACKED4_TO_PACKED4_ROW_SSE2(_MM_SHUFFLE(1, 2, 3, 0));
        while (x--) {
            Uint8 Y1, U, Y2, V;

            Y1 = srcYUV[0];
            U = srcYUV[1];
            Y2 = srcYUV[2];
            V = srcYUV[3];
            srcYUV += 4;

            dstYUV[0] = Y1;
            dstYUV[1] = V;
            dstYUV[2] = Y2;
            dstYUV[3] = U;
            dstYUV += 4;
        }
        srcYUV += srcYUVPitchLeft;
        dstYUV += dstYUVPitchLeft;
        x = YUVwidth;
    }
    return true;
}

static bool SDL_TARGETING("sse2") SDL_ConvertPixels_UYVY_to_YUY2_SSE2(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
    int x, y;
    const int YUVwidth = (width + 1) / 2;
    const int srcYUVPitchLeft = (src_pitch - YUVwidth * 4);
    const int dstYUVPitchLeft = (dst_pitch - YUVwidth * 4);
    const Uint8 *srcYUV = (const Uint8 *)src;
    Uint8 *dstYUV = (Uint8 *)dst;

    y = height;
    x = YUVwidth;
    while (y--) {
        PACKED4_TO_PACKED4_ROW_SSE2(_MM_SHUFFLE(2, 3, 0, 1));
        while (x--) {
            Uint8 Y1, U, Y2, V;

            U = srcYUV[0];
            Y1 = srcYUV[1];
            V = srcYUV[2];
            Y2 = srcYUV[3];
            srcYUV += 4;

            dstYUV[0] = Y1;
            dstYUV[1] = U;
            dstYUV[2] = Y2;
            dstYUV[3] = V;
            dstYUV += 4;
        }
        srcYUV += srcYUVPitchLeft;
        dstYUV += dstYUVPitchLeft;
        x = YUVwidth;
    }
    return true;
}

static bool SDL_TARGETING("sse2") SDL_ConvertPixels_UYVY_to_YVYU_SSE2(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
    int x, y;
    const int YUVwidth = (width + 1) / 2;
    const int srcYUVPitchLeft = (src_pitch - YUVwidth * 4);
    const int dstYUVPitchLeft = (dst_pitch - YUVwidth * 4);
    const Uint8 *srcYUV = (const Uint8 *)src;
    Uint8 *dstYUV = (Uint8 *)dst;

    y = height;
    x = YUVwidth;
    while (y--) {
        PACKED4_TO_PACKED4_ROW_SSE2(_MM_SHUFFLE(0, 3, 2, 1));
        while (x--) {
            Uint8 Y1, U, Y2, V;

            U = srcYUV[0];
            Y1 = srcYUV[1];
            V = srcYUV[2];
            Y2 = srcYUV[3];
            srcYUV += 4;

            dstYUV[0] = Y1;
            dstYUV[1] = V;
            dstYUV[2] = Y2;
            dstYUV[3] = U;
            dstYUV += 4;
        }
        srcYUV += srcYUVPitchLeft;
        dstYUV += dstYUVPitchLeft;
        x = YUVwidth;
    }
    return true;
}

static bool SDL_TARGETING("sse2") SDL_ConvertPixels_YVYU_to_YUY2_SSE2(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
    int x, y;
    const int YUVwidth = (width + 1) / 2;
    const int srcYUVPitchLeft = (src_pitch - YUVwidth * 4);
    const int dstYUVPitchLeft = (dst_pitch - YUVwidth * 4);
    const Uint8 *srcYUV = (const Uint8 *)src;
    Uint8 *dstYUV = (Uint8 *)dst;

    y = height;
    x = YUVwidth;
    while (y--) {
        PACKED4_TO_PACKED4_ROW_SSE2(_MM_SHUFFLE(1, 2, 3, 0));
        while (x--) {
            Uint8 Y1, U, Y2, V;

            Y1 = srcYUV[0];
            V = srcYUV[1];
            Y2 = srcYUV[2];
            U = srcYUV[3];
            srcYUV += 4;

            dstYUV[0] = Y1;
            dstYUV[1] = U;
            dstYUV[2] = Y2;
            dstYUV[3] = V;
            dstYUV += 4;
        }
        srcYUV += srcYUVPitchLeft;
        dstYUV += dstYUVPitchLeft;
        x = YUVwidth;
    }
    return true;
}

static bool SDL_TARGETING("sse2") SDL_ConvertPixels_YVYU_to_UYVY_SSE2(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
    int x, y;
    const int YUVwidth = (width + 1) / 2;
    const int srcYUVPitchLeft = (src_pitch - YUVwidth * 4);
    const int dstYUVPitchLeft = (dst_pitch - YUVwidth * 4);
    const Uint8 *srcYUV = (const Uint8 *)src;
    Uint8 *dstYUV = (Uint8 *)dst;

    y = height;
    x = YUVwidth;
    while (y--) {
        PACKED4_TO_PACKED4_ROW_SSE2(_MM_SHUFFLE(2, 1, 0, 3));
        while (x--) {
            Uint8 Y1, U, Y2, V;

            Y1 = srcYUV[0];
            V = srcYUV[1];
            Y2 = srcYUV[2];
            U = srcYUV[3];
            srcYUV += 4;

            dstYUV[0] = U;
            dstYUV[1] = Y1;
            dstYUV[2] = V;
            dstYUV[3] = Y2;
            dstYUV += 4;
        }
        srcYUV += srcYUVPitchLeft;
        dstYUV += dstYUVPitchLeft;
        x = YUVwidth;
    }
    return true;
}
#endif

static bool SDL_ConvertPixels_YUY2_to_UYVY_std(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
    int x, y;
    const int YUVwidth = (width + 1) / 2;
    const int srcYUVPitchLeft = (src_pitch - YUVwidth * 4);
    const int dstYUVPitchLeft = (dst_pitch - YUVwidth * 4);
    const Uint8 *srcYUV = (const Uint8 *)src;
    Uint8 *dstYUV = (Uint8 *)dst;

    y = height;
    while (y--) {
        x = YUVwidth;
        while (x--) {
            Uint8 Y1, U, Y2, V;

            Y1 = srcYUV[0];
            U = srcYUV[1];
            Y2 = srcYUV[2];
            V = srcYUV[3];
            srcYUV += 4;

            dstYUV[0] = U;
            dstYUV[1] = Y1;
            dstYUV[2] = V;
            dstYUV[3] = Y2;
            dstYUV += 4;
        }
        srcYUV += srcYUVPitchLeft;
        dstYUV += dstYUVPitchLeft;
    }
    return true;
}

static bool SDL_ConvertPixels_YUY2_to_YVYU_std(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
    int x, y;
    const int YUVwidth = (width + 1) / 2;
    const int srcYUVPitchLeft = (src_pitch - YUVwidth * 4);
    const int dstYUVPitchLeft = (dst_pitch - YUVwidth * 4);
    const Uint8 *srcYUV = (const Uint8 *)src;
    Uint8 *dstYUV = (Uint8 *)dst;

    y = height;
    while (y--) {
        x = YUVwidth;
        while (x--) {
            Uint8 Y1, U, Y2, V;

            Y1 = srcYUV[0];
            U = srcYUV[1];
            Y2 = srcYUV[2];
            V = srcYUV[3];
            srcYUV += 4;

            dstYUV[0] = Y1;
            dstYUV[1] = V;
            dstYUV[2] = Y2;
            dstYUV[3] = U;
            dstYUV += 4;
        }
        srcYUV += srcYUVPitchLeft;
        dstYUV += dstYUVPitchLeft;
    }
    return true;
}

static bool SDL_ConvertPixels_UYVY_to_YUY2_std(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
    int x, y;
    const int YUVwidth = (width + 1) / 2;
    const int srcYUVPitchLeft = (src_pitch - YUVwidth * 4);
    const int dstYUVPitchLeft = (dst_pitch - YUVwidth * 4);
    const Uint8 *srcYUV = (const Uint8 *)src;
    Uint8 *dstYUV = (Uint8 *)dst;

    y = height;
    while (y--) {
        x = YUVwidth;
        while (x--) {
            Uint8 Y1, U, Y2, V;

            U = srcYUV[0];
            Y1 = srcYUV[1];
            V = srcYUV[2];
            Y2 = srcYUV[3];
            srcYUV += 4;

            dstYUV[0] = Y1;
            dstYUV[1] = U;
            dstYUV[2] = Y2;
            dstYUV[3] = V;
            dstYUV += 4;
        }
        srcYUV += srcYUVPitchLeft;
        dstYUV += dstYUVPitchLeft;
    }
    return true;
}

static bool SDL_ConvertPixels_UYVY_to_YVYU_std(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
    int x, y;
    const int YUVwidth = (width + 1) / 2;
    const int srcYUVPitchLeft = (src_pitch - YUVwidth * 4);
    const int dstYUVPitchLeft = (dst_pitch - YUVwidth * 4);
    const Uint8 *srcYUV = (const Uint8 *)src;
    Uint8 *dstYUV = (Uint8 *)dst;

    y = height;
    while (y--) {
        x = YUVwidth;
        while (x--) {
            Uint8 Y1, U, Y2, V;

            U = srcYUV[0];
            Y1 = srcYUV[1];
            V = srcYUV[2];
            Y2 = srcYUV[3];
            srcYUV += 4;

            dstYUV[0] = Y1;
            dstYUV[1] = V;
            dstYUV[2] = Y2;
            dstYUV[3] = U;
            dstYUV += 4;
        }
        srcYUV += srcYUVPitchLeft;
        dstYUV += dstYUVPitchLeft;
    }
    return true;
}

static bool SDL_ConvertPixels_YVYU_to_YUY2_std(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
    int x, y;
    const int YUVwidth = (width + 1) / 2;
    const int srcYUVPitchLeft = (src_pitch - YUVwidth * 4);
    const int dstYUVPitchLeft = (dst_pitch - YUVwidth * 4);
    const Uint8 *srcYUV = (const Uint8 *)src;
    Uint8 *dstYUV = (Uint8 *)dst;

    y = height;
    while (y--) {
        x = YUVwidth;
        while (x--) {
            Uint8 Y1, U, Y2, V;

            Y1 = srcYUV[0];
            V = srcYUV[1];
            Y2 = srcYUV[2];
            U = srcYUV[3];
            srcYUV += 4;

            dstYUV[0] = Y1;
            dstYUV[1] = U;
            dstYUV[2] = Y2;
            dstYUV[3] = V;
            dstYUV += 4;
        }
        srcYUV += srcYUVPitchLeft;
        dstYUV += dstYUVPitchLeft;
    }
    return true;
}

static bool SDL_ConvertPixels_YVYU_to_UYVY_std(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
    int x, y;
    const int YUVwidth = (width + 1) / 2;
    const int srcYUVPitchLeft = (src_pitch - YUVwidth * 4);
    const int dstYUVPitchLeft = (dst_pitch - YUVwidth * 4);
    const Uint8 *srcYUV = (const Uint8 *)src;
    Uint8 *dstYUV = (Uint8 *)dst;

    y = height;
    while (y--) {
        x = YUVwidth;
        while (x--) {
            Uint8 Y1, U, Y2, V;

            Y1 = srcYUV[0];
            V = srcYUV[1];
            Y2 = srcYUV[2];
            U = srcYUV[3];
            srcYUV += 4;

            dstYUV[0] = U;
            dstYUV[1] = Y1;
            dstYUV[2] = V;
            dstYUV[3] = Y2;
            dstYUV += 4;
        }
        srcYUV += srcYUVPitchLeft;
        dstYUV += dstYUVPitchLeft;
    }
    return true;
}

static bool SDL_ConvertPixels_YUY2_to_UYVY(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
#ifdef SDL_SSE2_INTRINSICS
    if (SDL_HasSSE2()) {
      return SDL_ConvertPixels_YUY2_to_UYVY_SSE2(width, height, src, src_pitch, dst, dst_pitch);
    }
#endif
    return SDL_ConvertPixels_YUY2_to_UYVY_std(width, height, src, src_pitch, dst, dst_pitch);
}

static bool SDL_ConvertPixels_YUY2_to_YVYU(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
#ifdef SDL_SSE2_INTRINSICS
    if (SDL_HasSSE2()) {
      return SDL_ConvertPixels_YUY2_to_YVYU_SSE2(width, height, src, src_pitch, dst, dst_pitch);
    }
#endif
    return SDL_ConvertPixels_YUY2_to_YVYU_std(width, height, src, src_pitch, dst, dst_pitch);
}

static bool SDL_ConvertPixels_UYVY_to_YUY2(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
#ifdef SDL_SSE2_INTRINSICS
    if (SDL_HasSSE2()) {
      return SDL_ConvertPixels_UYVY_to_YUY2_SSE2(width, height, src, src_pitch, dst, dst_pitch);
    }
#endif
    return SDL_ConvertPixels_UYVY_to_YUY2_std(width, height, src, src_pitch, dst, dst_pitch);
}

static bool SDL_ConvertPixels_UYVY_to_YVYU(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
#ifdef SDL_SSE2_INTRINSICS
    if (SDL_HasSSE2()) {
      return SDL_ConvertPixels_UYVY_to_YVYU_SSE2(width, height, src, src_pitch, dst, dst_pitch);
    }
#endif
    return SDL_ConvertPixels_UYVY_to_YVYU_std(width, height, src, src_pitch, dst, dst_pitch);
}

static bool SDL_ConvertPixels_YVYU_to_YUY2(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
#ifdef SDL_SSE2_INTRINSICS
    if (SDL_HasSSE2()) {
      return SDL_ConvertPixels_YVYU_to_YUY2_SSE2(width, height, src, src_pitch, dst, dst_pitch);
    }
#endif
    return SDL_ConvertPixels_YVYU_to_YUY2_std(width, height, src, src_pitch, dst, dst_pitch);
}

static bool SDL_ConvertPixels_YVYU_to_UYVY(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
{
#ifdef SDL_SSE2_INTRINSICS
    if (SDL_HasSSE2()) {
      return SDL_ConvertPixels_YVYU_to_UYVY_SSE2(width, height, src, src_pitch, dst, dst_pitch);
    }
#endif
    return SDL_ConvertPixels_YVYU_to_UYVY_std(width, height, src, src_pitch, dst, dst_pitch);
}

static bool SDL_ConvertPixels_Packed4_to_Packed4(int width, int height,
                                                SDL_PixelFormat src_format, const void *src, int src_pitch,
                                                SDL_PixelFormat dst_format, void *dst, int dst_pitch)
{
    switch (src_format) {
    case SDL_PIXELFORMAT_YUY2:
        switch (dst_format) {
        case SDL_PIXELFORMAT_UYVY:
            return SDL_ConvertPixels_YUY2_to_UYVY(width, height, src, src_pitch, dst, dst_pitch);
        case SDL_PIXELFORMAT_YVYU:
            return SDL_ConvertPixels_YUY2_to_YVYU(width, height, src, src_pitch, dst, dst_pitch);
        default:
            break;
        }
        break;
    case SDL_PIXELFORMAT_UYVY:
        switch (dst_format) {
        case SDL_PIXELFORMAT_YUY2:
            return SDL_ConvertPixels_UYVY_to_YUY2(width, height, src, src_pitch, dst, dst_pitch);
        case SDL_PIXELFORMAT_YVYU:
            return SDL_ConvertPixels_UYVY_to_YVYU(width, height, src, src_pitch, dst, dst_pitch);
        default:
            break;
        }
        break;
    case SDL_PIXELFORMAT_YVYU:
        switch (dst_format) {
        case SDL_PIXELFORMAT_YUY2:
            return SDL_ConvertPixels_YVYU_to_YUY2(width, height, src, src_pitch, dst, dst_pitch);
        case SDL_PIXELFORMAT_UYVY:
            return SDL_ConvertPixels_YVYU_to_UYVY(width, height, src, src_pitch, dst, dst_pitch);
        default:
            break;
        }
        break;
    default:
        break;
    }
    return SDL_SetError("SDL_ConvertPixels_Packed4_to_Packed4: Unsupported YUV conversion: %s -> %s", SDL_GetPixelFormatName(src_format),
                        SDL_GetPixelFormatName(dst_format));
}

static bool SDL_ConvertPixels_Planar2x2_to_Packed4(int width, int height,
                                                   SDL_PixelFormat src_format, const void *src, int src_pitch,
                                                   SDL_PixelFormat dst_format, void *dst, int dst_pitch)
{
    int x, y;
    const Uint8 *srcY1, *srcY2, *srcU, *srcV;
    Uint32 srcY_pitch, srcUV_pitch;
    Uint32 srcY_pitch_left, srcUV_pitch_left, srcUV_pixel_stride;
    Uint8 *dstY1, *dstY2, *dstU1, *dstU2, *dstV1, *dstV2;
    Uint32 dstY_pitch, dstUV_pitch;
    Uint32 dst_pitch_left;

    if (src == dst) {
        return SDL_SetError("Can't change YUV plane types in-place");
    }

    if (!GetYUVPlanes(width, height, src_format, src, src_pitch,
                      &srcY1, &srcU, &srcV, &srcY_pitch, &srcUV_pitch)) {
        return false;
    }
    srcY2 = srcY1 + srcY_pitch;
    srcY_pitch_left = (srcY_pitch - width);

    if (src_format == SDL_PIXELFORMAT_NV12 || src_format == SDL_PIXELFORMAT_NV21) {
        srcUV_pixel_stride = 2;
        srcUV_pitch_left = (srcUV_pitch - 2 * ((width + 1) / 2));
    } else {
        srcUV_pixel_stride = 1;
        srcUV_pitch_left = (srcUV_pitch - ((width + 1) / 2));
    }

    if (!GetYUVPlanes(width, height, dst_format, dst, dst_pitch,
                      (const Uint8 **)&dstY1, (const Uint8 **)&dstU1, (const Uint8 **)&dstV1,
                      &dstY_pitch, &dstUV_pitch)) {
        return false;
    }
    dstY2 = dstY1 + dstY_pitch;
    dstU2 = dstU1 + dstUV_pitch;
    dstV2 = dstV1 + dstUV_pitch;
    dst_pitch_left = (dstY_pitch - 4 * ((width + 1) / 2));

    // Copy 2x2 blocks of pixels at a time
    for (y = 0; y < (height - 1); y += 2) {
        for (x = 0; x < (width - 1); x += 2) {
            // Row 1
            *dstY1 = *srcY1++;
            dstY1 += 2;
            *dstY1 = *srcY1++;
            dstY1 += 2;
            *dstU1 = *srcU;
            *dstV1 = *srcV;

            // Row 2
            *dstY2 = *srcY2++;
            dstY2 += 2;
            *dstY2 = *srcY2++;
            dstY2 += 2;
            *dstU2 = *srcU;
            *dstV2 = *srcV;

            srcU += srcUV_pixel_stride;
            srcV += srcUV_pixel_stride;
            dstU1 += 4;
            dstU2 += 4;
            dstV1 += 4;
            dstV2 += 4;
        }

        // Last column
        if (x == (width - 1)) {
            // Row 1
            *dstY1 = *srcY1;
            dstY1 += 2;
            *dstY1 = *srcY1++;
            dstY1 += 2;
            *dstU1 = *srcU;
            *dstV1 = *srcV;

            // Row 2
            *dstY2 = *srcY2;
            dstY2 += 2;
            *dstY2 = *srcY2++;
            dstY2 += 2;
            *dstU2 = *srcU;
            *dstV2 = *srcV;

            srcU += srcUV_pixel_stride;
            srcV += srcUV_pixel_stride;
            dstU1 += 4;
            dstU2 += 4;
            dstV1 += 4;
            dstV2 += 4;
        }

        srcY1 += srcY_pitch_left + srcY_pitch;
        srcY2 += srcY_pitch_left + srcY_pitch;
        srcU += srcUV_pitch_left;
        srcV += srcUV_pitch_left;
        dstY1 += dst_pitch_left + dstY_pitch;
        dstY2 += dst_pitch_left + dstY_pitch;
        dstU1 += dst_pitch_left + dstUV_pitch;
        dstU2 += dst_pitch_left + dstUV_pitch;
        dstV1 += dst_pitch_left + dstUV_pitch;
        dstV2 += dst_pitch_left + dstUV_pitch;
    }

    // Last row
    if (y == (height - 1)) {
        for (x = 0; x < (width - 1); x += 2) {
            // Row 1
            *dstY1 = *srcY1++;
            dstY1 += 2;
            *dstY1 = *srcY1++;
            dstY1 += 2;
            *dstU1 = *srcU;
            *dstV1 = *srcV;

            srcU += srcUV_pixel_stride;
            srcV += srcUV_pixel_stride;
            dstU1 += 4;
            dstV1 += 4;
        }

        // Last column
        if (x == (width - 1)) {
            // Row 1
            *dstY1 = *srcY1;
            dstY1 += 2;
            *dstY1 = *srcY1++;
            dstY1 += 2;
            *dstU1 = *srcU;
            *dstV1 = *srcV;

            srcU += srcUV_pixel_stride;
            srcV += srcUV_pixel_stride;
            dstU1 += 4;
            dstV1 += 4;
        }
    }
    return true;
}

static bool SDL_ConvertPixels_Packed4_to_Planar2x2(int width, int height,
                                                   SDL_PixelFormat src_format, const void *src, int src_pitch,
                                                   SDL_PixelFormat dst_format, void *dst, int dst_pitch)
{
    int x, y;
    const Uint8 *srcY1, *srcY2, *srcU1, *srcU2, *srcV1, *srcV2;
    Uint32 srcY_pitch, srcUV_pitch;
    Uint32 src_pitch_left;
    Uint8 *dstY1, *dstY2, *dstU, *dstV;
    Uint32 dstY_pitch, dstUV_pitch;
    Uint32 dstY_pitch_left, dstUV_pitch_left, dstUV_pixel_stride;

    if (src == dst) {
        return SDL_SetError("Can't change YUV plane types in-place");
    }

    if (!GetYUVPlanes(width, height, src_format, src, src_pitch,
                      &srcY1, &srcU1, &srcV1, &srcY_pitch, &srcUV_pitch)) {
        return false;
    }
    srcY2 = srcY1 + srcY_pitch;
    srcU2 = srcU1 + srcUV_pitch;
    srcV2 = srcV1 + srcUV_pitch;
    src_pitch_left = (srcY_pitch - 4 * ((width + 1) / 2));

    if (!GetYUVPlanes(width, height, dst_format, dst, dst_pitch,
                      (const Uint8 **)&dstY1, (const Uint8 **)&dstU, (const Uint8 **)&dstV,
                      &dstY_pitch, &dstUV_pitch)) {
        return false;
    }
    dstY2 = dstY1 + dstY_pitch;
    dstY_pitch_left = (dstY_pitch - width);

    if (dst_format == SDL_PIXELFORMAT_NV12 || dst_format == SDL_PIXELFORMAT_NV21) {
        dstUV_pixel_stride = 2;
        dstUV_pitch_left = (dstUV_pitch - 2 * ((width + 1) / 2));
    } else {
        dstUV_pixel_stride = 1;
        dstUV_pitch_left = (dstUV_pitch - ((width + 1) / 2));
    }

    // Copy 2x2 blocks of pixels at a time
    for (y = 0; y < (height - 1); y += 2) {
        for (x = 0; x < (width - 1); x += 2) {
            // Row 1
            *dstY1++ = *srcY1;
            srcY1 += 2;
            *dstY1++ = *srcY1;
            srcY1 += 2;

            // Row 2
            *dstY2++ = *srcY2;
            srcY2 += 2;
            *dstY2++ = *srcY2;
            srcY2 += 2;

            *dstU = (Uint8)(((Uint32)*srcU1 + *srcU2) / 2);
            *dstV = (Uint8)(((Uint32)*srcV1 + *srcV2) / 2);

            srcU1 += 4;
            srcU2 += 4;
            srcV1 += 4;
            srcV2 += 4;
            dstU += dstUV_pixel_stride;
            dstV += dstUV_pixel_stride;
        }

        // Last column
        if (x == (width - 1)) {
            // Row 1
            *dstY1 = *srcY1;
            srcY1 += 2;
            *dstY1++ = *srcY1;
            srcY1 += 2;

            // Row 2
            *dstY2 = *srcY2;
            srcY2 += 2;
            *dstY2++ = *srcY2;
            srcY2 += 2;

            *dstU = (Uint8)(((Uint32)*srcU1 + *srcU2) / 2);
            *dstV = (Uint8)(((Uint32)*srcV1 + *srcV2) / 2);

            srcU1 += 4;
            srcU2 += 4;
            srcV1 += 4;
            srcV2 += 4;
            dstU += dstUV_pixel_stride;
            dstV += dstUV_pixel_stride;
        }

        srcY1 += src_pitch_left + srcY_pitch;
        srcY2 += src_pitch_left + srcY_pitch;
        srcU1 += src_pitch_left + srcUV_pitch;
        srcU2 += src_pitch_left + srcUV_pitch;
        srcV1 += src_pitch_left + srcUV_pitch;
        srcV2 += src_pitch_left + srcUV_pitch;
        dstY1 += dstY_pitch_left + dstY_pitch;
        dstY2 += dstY_pitch_left + dstY_pitch;
        dstU += dstUV_pitch_left;
        dstV += dstUV_pitch_left;
    }

    // Last row
    if (y == (height - 1)) {
        for (x = 0; x < (width - 1); x += 2) {
            *dstY1++ = *srcY1;
            srcY1 += 2;
            *dstY1++ = *srcY1;
            srcY1 += 2;

            *dstU = *srcU1;
            *dstV = *srcV1;

            srcU1 += 4;
            srcV1 += 4;
            dstU += dstUV_pixel_stride;
            dstV += dstUV_pixel_stride;
        }

        // Last column
        if (x == (width - 1)) {
            *dstY1 = *srcY1;
            *dstU = *srcU1;
            *dstV = *srcV1;
        }
    }
    return true;
}

#endif // SDL_HAVE_YUV

bool SDL_ConvertPixels_YUV_to_YUV(int width, int height,
                                  SDL_PixelFormat src_format, SDL_Colorspace src_colorspace, SDL_PropertiesID src_properties, const void *src, int src_pitch,
                                  SDL_PixelFormat dst_format, SDL_Colorspace dst_colorspace, SDL_PropertiesID dst_properties, void *dst, int dst_pitch)
{
#ifdef SDL_HAVE_YUV
    if (src_colorspace != dst_colorspace) {
        return SDL_SetError("SDL_ConvertPixels_YUV_to_YUV: colorspace conversion not supported");
    }

    if (src_format == dst_format) {
        if (src == dst) {
            // Nothing to do
            return true;
        }
        return SDL_ConvertPixels_YUV_to_YUV_Copy(width, height, src_format, src, src_pitch, dst, dst_pitch);
    }

    if (IsPlanar2x2Format(src_format) && IsPlanar2x2Format(dst_format)) {
        return SDL_ConvertPixels_Planar2x2_to_Planar2x2(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch);
    } else if (IsPacked4Format(src_format) && IsPacked4Format(dst_format)) {
        return SDL_ConvertPixels_Packed4_to_Packed4(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch);
    } else if (IsPlanar2x2Format(src_format) && IsPacked4Format(dst_format)) {
        return SDL_ConvertPixels_Planar2x2_to_Packed4(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch);
    } else if (IsPacked4Format(src_format) && IsPlanar2x2Format(dst_format)) {
        return SDL_ConvertPixels_Packed4_to_Planar2x2(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch);
    } else {
        return SDL_SetError("SDL_ConvertPixels_YUV_to_YUV: Unsupported YUV conversion: %s -> %s", SDL_GetPixelFormatName(src_format),
                            SDL_GetPixelFormatName(dst_format));
    }
#else
    return SDL_SetError("SDL not built with YUV support");
#endif
}