ref: 41c3afd927f72ef86d7eb81c0e4746b2b490c62b
dir: /external/SDL2/src/video/yuv2rgb/yuv_rgb_std_func.h/
// 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
#define y_pixel_stride 1
#define uv_pixel_stride 1
#define uv_x_sample_interval 2
#define uv_y_sample_interval 2
#elif YUV_FORMAT == YUV_FORMAT_422
#define y_pixel_stride 2
#define uv_pixel_stride 4
#define uv_x_sample_interval 2
#define uv_y_sample_interval 1
#elif YUV_FORMAT == YUV_FORMAT_NV12
#define y_pixel_stride 1
#define uv_pixel_stride 2
#define uv_x_sample_interval 2
#define 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;
#if uv_y_sample_interval > 1
uint8_t *rgb_ptr2=RGB+(y+1)*RGB_stride;
#endif
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);
#endif
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);
#endif
}
}
/* 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 y_pixel_stride
#undef uv_pixel_stride
#undef uv_x_sample_interval
#undef uv_y_sample_interval
}
#undef STD_FUNCTION_NAME
#undef YUV_FORMAT
#undef RGB_FORMAT
#undef PACK_PIXEL