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/*
* (C) Gražvydas "notaz" Ignotas, 2011,2012
*
* This work is licensed under the terms of any of these licenses
* (at your option):
* - GNU GPL, version 2 or later.
* - GNU LGPL, version 2.1 or later.
* See the COPYING file in the top-level directory.
*/
#include "cspace.h"
/*
* note: these are intended for testing and should be avoided
* in favor of NEON version or platform-specific conversion
*/
#ifndef __ARM_NEON__
void bgr555_to_rgb565(void *dst_, const void *src_, int bytes)
{
const unsigned int *src = src_;
unsigned int *dst = dst_;
unsigned int p;
int x;
for (x = 0; x < bytes / 4; x++) {
p = src[x];
p = ((p & 0x7c007c00) >> 10) | ((p & 0x03e003e0) << 1)
| ((p & 0x001f001f) << 11);
dst[x] = p;
}
}
void bgr888_to_rgb565(void *dst_, const void *src_, int bytes)
{
const unsigned char *src = src_;
unsigned int *dst = dst_;
unsigned int r1, g1, b1, r2, g2, b2;
for (; bytes >= 6; bytes -= 6, src += 6, dst++) {
r1 = src[0] & 0xf8;
g1 = src[1] & 0xfc;
b1 = src[2] & 0xf8;
r2 = src[3] & 0xf8;
g2 = src[4] & 0xfc;
b2 = src[5] & 0xf8;
*dst = (r2 << 24) | (g2 << 19) | (b2 << 13) |
(r1 << 8) | (g1 << 3) | (b1 >> 3);
}
}
// TODO?
void rgb888_to_rgb565(void *dst, const void *src, int bytes) {}
void bgr888_to_rgb888(void *dst, const void *src, int bytes) {}
#endif // __ARM_NEON__
/* YUV stuff */
static int yuv_ry[32], yuv_gy[32], yuv_by[32];
static unsigned char yuv_u[32 * 2], yuv_v[32 * 2];
void bgr_to_uyvy_init(void)
{
int i, v;
/* init yuv converter:
y0 = (int)((0.299f * r0) + (0.587f * g0) + (0.114f * b0));
y1 = (int)((0.299f * r1) + (0.587f * g1) + (0.114f * b1));
u = (int)(8 * 0.565f * (b0 - y0)) + 128;
v = (int)(8 * 0.713f * (r0 - y0)) + 128;
*/
for (i = 0; i < 32; i++) {
yuv_ry[i] = (int)(0.299f * i * 65536.0f + 0.5f);
yuv_gy[i] = (int)(0.587f * i * 65536.0f + 0.5f);
yuv_by[i] = (int)(0.114f * i * 65536.0f + 0.5f);
}
for (i = -32; i < 32; i++) {
v = (int)(8 * 0.565f * i) + 128;
if (v < 0)
v = 0;
if (v > 255)
v = 255;
yuv_u[i + 32] = v;
v = (int)(8 * 0.713f * i) + 128;
if (v < 0)
v = 0;
if (v > 255)
v = 255;
yuv_v[i + 32] = v;
}
}
void bgr555_to_uyvy(void *d, const void *s, int pixels)
{
unsigned int *dst = d;
const unsigned short *src = s;
const unsigned char *yu = yuv_u + 32;
const unsigned char *yv = yuv_v + 32;
int r0, g0, b0, r1, g1, b1;
int y0, y1, u, v;
for (; pixels > 0; src += 2, dst++, pixels -= 2)
{
b0 = (src[0] >> 10) & 0x1f;
g0 = (src[0] >> 5) & 0x1f;
r0 = src[0] & 0x1f;
b1 = (src[1] >> 10) & 0x1f;
g1 = (src[1] >> 5) & 0x1f;
r1 = src[1] & 0x1f;
y0 = (yuv_ry[r0] + yuv_gy[g0] + yuv_by[b0]) >> 16;
y1 = (yuv_ry[r1] + yuv_gy[g1] + yuv_by[b1]) >> 16;
u = yu[b0 - y0];
v = yv[r0 - y0];
// valid Y range seems to be 16..235
y0 = 16 + 219 * y0 / 31;
y1 = 16 + 219 * y1 / 31;
*dst = (y1 << 24) | (v << 16) | (y0 << 8) | u;
}
}
void bgr888_to_uyvy(void *d, const void *s, int pixels)
{
unsigned int *dst = d;
const unsigned char *src8 = s;
const unsigned char *yu = yuv_u + 32;
const unsigned char *yv = yuv_v + 32;
int r0, g0, b0, r1, g1, b1;
int y0, y1, u, v;
for (; pixels > 0; src8 += 3*2, dst++, pixels -= 2)
{
r0 = src8[0], g0 = src8[1], b0 = src8[2];
r1 = src8[3], g1 = src8[4], b1 = src8[5];
y0 = (r0 * 19595 + g0 * 38470 + b0 * 7471) >> 16;
y1 = (r1 * 19595 + g1 * 38470 + b1 * 7471) >> 16;
u = yu[(b0 - y0) / 8];
v = yv[(r0 - y0) / 8];
y0 = 16 + 219 * y0 / 255;
y1 = 16 + 219 * y1 / 255;
*dst = (y1 << 24) | (v << 16) | (y0 << 8) | u;
}
}
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