// Copyright 2016 Adrien Descamps

// Distributed under BSD 3-Clause License

/* You need to define the following macros before including this file:

STD_FUNCTION_NAME

YUV_FORMAT

RGB_FORMAT

*/

#if RGB_FORMAT == RGB_FORMAT_RGB565

#define PACK_PIXEL(rgb_ptr) \

*(Uint16 *)rgb_ptr = \

((((Uint16)clampU8(y_tmp+r_tmp)) << 8 ) & 0xF800) | \

((((Uint16)clampU8(y_tmp+g_tmp)) << 3) & 0x07E0) | \

(((Uint16)clampU8(y_tmp+b_tmp)) >> 3); \

rgb_ptr += 2; \

#elif RGB_FORMAT == RGB_FORMAT_RGB24

#define PACK_PIXEL(rgb_ptr) \

rgb_ptr[0] = clampU8(y_tmp+r_tmp); \

rgb_ptr[1] = clampU8(y_tmp+g_tmp); \

rgb_ptr[2] = clampU8(y_tmp+b_tmp); \

rgb_ptr += 3; \

#elif RGB_FORMAT == RGB_FORMAT_RGBA

#define PACK_PIXEL(rgb_ptr) \

*(Uint32 *)rgb_ptr = \

(((Uint32)clampU8(y_tmp+r_tmp)) << 24) | \

(((Uint32)clampU8(y_tmp+g_tmp)) << 16) | \

(((Uint32)clampU8(y_tmp+b_tmp)) << 8) | \

0x000000FF; \

rgb_ptr += 4; \

#elif RGB_FORMAT == RGB_FORMAT_BGRA

#define PACK_PIXEL(rgb_ptr) \

*(Uint32 *)rgb_ptr = \

(((Uint32)clampU8(y_tmp+b_tmp)) << 24) | \

(((Uint32)clampU8(y_tmp+g_tmp)) << 16) | \

(((Uint32)clampU8(y_tmp+r_tmp)) << 8) | \

0x000000FF; \

rgb_ptr += 4; \

#elif RGB_FORMAT == RGB_FORMAT_ARGB

#define PACK_PIXEL(rgb_ptr) \

*(Uint32 *)rgb_ptr = \

0xFF000000 | \

(((Uint32)clampU8(y_tmp+r_tmp)) << 16) | \

(((Uint32)clampU8(y_tmp+g_tmp)) << 8) | \

(((Uint32)clampU8(y_tmp+b_tmp)) << 0); \

rgb_ptr += 4; \

#elif RGB_FORMAT == RGB_FORMAT_ABGR

#define PACK_PIXEL(rgb_ptr) \

*(Uint32 *)rgb_ptr = \

0xFF000000 | \

(((Uint32)clampU8(y_tmp+b_tmp)) << 16) | \

(((Uint32)clampU8(y_tmp+g_tmp)) << 8) | \

(((Uint32)clampU8(y_tmp+r_tmp)) << 0); \

rgb_ptr += 4; \

#else

#error PACK_PIXEL unimplemented

#endif

void STD_FUNCTION_NAME(

uint32_t width, uint32_t height,

const uint8_t *Y, const uint8_t *U, const uint8_t *V, uint32_t Y_stride, uint32_t UV_stride,

uint8_t *RGB, uint32_t RGB_stride,

YCbCrType yuv_type)

{

const YUV2RGBParam *const param = &(YUV2RGB[yuv_type]);

#if YUV_FORMAT == YUV_FORMAT_420

const int y_pixel_stride = 1;

const int uv_pixel_stride = 1;

const int uv_x_sample_interval = 2;

const int uv_y_sample_interval = 2;

#elif YUV_FORMAT == YUV_FORMAT_422

const int y_pixel_stride = 2;

const int uv_pixel_stride = 4;

const int uv_x_sample_interval = 2;

const int uv_y_sample_interval = 1;

#elif YUV_FORMAT == YUV_FORMAT_NV12

const int y_pixel_stride = 1;

const int uv_pixel_stride = 2;

const int uv_x_sample_interval = 2;

const int uv_y_sample_interval = 2;

#endif

uint32_t x, y;

for(y=0; y<(height-(uv_y_sample_interval-1)); y+=uv_y_sample_interval)

{

const uint8_t *y_ptr1=Y+y*Y_stride,

*y_ptr2=Y+(y+1)*Y_stride,

*u_ptr=U+(y/uv_y_sample_interval)*UV_stride,

*v_ptr=V+(y/uv_y_sample_interval)*UV_stride;

uint8_t *rgb_ptr1=RGB+y*RGB_stride,

*rgb_ptr2=RGB+(y+1)*RGB_stride;

for(x=0; x<(width-(uv_x_sample_interval-1)); x+=uv_x_sample_interval)

{

// Compute U and V contributions, common to the four pixels

int32_t u_tmp = ((*u_ptr)-128);

int32_t v_tmp = ((*v_ptr)-128);

int32_t r_tmp = (v_tmp*param->v_r_factor);

int32_t g_tmp = (u_tmp*param->u_g_factor + v_tmp*param->v_g_factor);

int32_t b_tmp = (u_tmp*param->u_b_factor);

// Compute the Y contribution for each pixel

int32_t y_tmp = ((y_ptr1[0]-param->y_shift)*param->y_factor);

PACK_PIXEL(rgb_ptr1);

y_tmp = ((y_ptr1[y_pixel_stride]-param->y_shift)*param->y_factor);

PACK_PIXEL(rgb_ptr1);

if (uv_y_sample_interval > 1) {

y_tmp = ((y_ptr2[0]-param->y_shift)*param->y_factor);

PACK_PIXEL(rgb_ptr2);

y_tmp = ((y_ptr2[y_pixel_stride]-param->y_shift)*param->y_factor);

PACK_PIXEL(rgb_ptr2);

}

y_ptr1+=2*y_pixel_stride;

y_ptr2+=2*y_pixel_stride;

u_ptr+=2*uv_pixel_stride/uv_x_sample_interval;

v_ptr+=2*uv_pixel_stride/uv_x_sample_interval;

}

/* Catch the last pixel, if needed */

if (uv_x_sample_interval == 2 && x == (width-1))

{

// Compute U and V contributions, common to the four pixels

int32_t u_tmp = ((*u_ptr)-128);

int32_t v_tmp = ((*v_ptr)-128);

int32_t r_tmp = (v_tmp*param->v_r_factor);

int32_t g_tmp = (u_tmp*param->u_g_factor + v_tmp*param->v_g_factor);

int32_t b_tmp = (u_tmp*param->u_b_factor);

// Compute the Y contribution for each pixel

int32_t y_tmp = ((y_ptr1[0]-param->y_shift)*param->y_factor);

PACK_PIXEL(rgb_ptr1);

if (uv_y_sample_interval > 1) {

y_tmp = ((y_ptr2[0]-param->y_shift)*param->y_factor);

PACK_PIXEL(rgb_ptr2);

}

}

}

/* Catch the last line, if needed */

if (uv_y_sample_interval == 2 && y == (height-1))

{

const uint8_t *y_ptr1=Y+y*Y_stride,

*u_ptr=U+(y/uv_y_sample_interval)*UV_stride,

*v_ptr=V+(y/uv_y_sample_interval)*UV_stride;

uint8_t *rgb_ptr1=RGB+y*RGB_stride;

for(x=0; x<(width-(uv_x_sample_interval-1)); x+=uv_x_sample_interval)

{

// Compute U and V contributions, common to the four pixels

int32_t u_tmp = ((*u_ptr)-128);

int32_t v_tmp = ((*v_ptr)-128);

int32_t r_tmp = (v_tmp*param->v_r_factor);

int32_t g_tmp = (u_tmp*param->u_g_factor + v_tmp*param->v_g_factor);

int32_t b_tmp = (u_tmp*param->u_b_factor);

// Compute the Y contribution for each pixel

int32_t y_tmp = ((y_ptr1[0]-param->y_shift)*param->y_factor);

PACK_PIXEL(rgb_ptr1);

y_tmp = ((y_ptr1[y_pixel_stride]-param->y_shift)*param->y_factor);

PACK_PIXEL(rgb_ptr1);

y_ptr1+=2*y_pixel_stride;

u_ptr+=2*uv_pixel_stride/uv_x_sample_interval;

v_ptr+=2*uv_pixel_stride/uv_x_sample_interval;

}

/* Catch the last pixel, if needed */

if (uv_x_sample_interval == 2 && x == (width-1))

{

// Compute U and V contributions, common to the four pixels

int32_t u_tmp = ((*u_ptr)-128);

int32_t v_tmp = ((*v_ptr)-128);

int32_t r_tmp = (v_tmp*param->v_r_factor);

int32_t g_tmp = (u_tmp*param->u_g_factor + v_tmp*param->v_g_factor);

int32_t b_tmp = (u_tmp*param->u_b_factor);

// Compute the Y contribution for each pixel

int32_t y_tmp = ((y_ptr1[0]-param->y_shift)*param->y_factor);

PACK_PIXEL(rgb_ptr1);

}

}

}

#undef STD_FUNCTION_NAME

#undef YUV_FORMAT

#undef RGB_FORMAT

#undef PACK_PIXEL