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some drawing code C optimisations

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This commit is contained in:
kub 2019-08-25 17:33:13 +02:00
parent f6b4a9ca53
commit f740428b81
5 changed files with 54 additions and 40 deletions
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35
platform/common/plat_sdl.c
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@ -89,7 +89,8 @@ static const struct in_pdata in_sdl_platform_data = {
/* YUV stuff */
static int yuv_ry[32], yuv_gy[32], yuv_by[32];
static unsigned char yuv_u[32 * 2], yuv_v[32 * 2];
static int yuv_y[256];
static unsigned char yuv_y[256];
static struct uyvy { unsigned int y:8; unsigned int vyu:24; } yuv_uyvy[65536];
void bgr_to_uyvy_init(void)
{
@ -124,34 +125,26 @@ void bgr_to_uyvy_init(void)
for (i = 0; i < 256; i++) {
yuv_y[i] = 16 + 219 * i / 32;
}
// everything combined into one large array for speed
for (i = 0; i < 65536; i++) {
int r = (i >> 11) & 0x1f, g = (i >> 6) & 0x1f, b = (i >> 0) & 0x1f;
int y = (yuv_ry[r] + yuv_gy[g] + yuv_by[b]) >> 16;
yuv_uyvy[i].y = yuv_y[y];
yuv_uyvy[i].vyu = (yuv_v[r-y + 32] << 16) | (yuv_y[y] << 8) | yuv_u[b-y + 32];
}
}
void rgb565_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)
for (; pixels > 0; src += 4, dst += 2, pixels -= 4)
{
r0 = (src[0] >> 11) & 0x1f;
g0 = (src[0] >> 6) & 0x1f;
b0 = src[0] & 0x1f;
r1 = (src[1] >> 11) & 0x1f;
g1 = (src[1] >> 6) & 0x1f;
b1 = 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 = yuv_y[y0];
y1 = yuv_y[y1];
*dst = (y1 << 24) | (v << 16) | (y0 << 8) | u;
struct uyvy *uyvy0 = yuv_uyvy + src[0], *uyvy1 = yuv_uyvy + src[1];
struct uyvy *uyvy2 = yuv_uyvy + src[2], *uyvy3 = yuv_uyvy + src[3];
dst[0] = (uyvy1->y << 24) | uyvy0->vyu;
dst[1] = (uyvy3->y << 24) | uyvy2->vyu;
}
}