Created
June 11, 2014 14:48
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RGB565 to UYV conversion table
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| static unsigned int uyv_table[0x10000]; | |
| void generate_rgb565_to_uyv_conv_table(void) | |
| { | |
| int y, u, v; | |
| unsigned char r, g, b; | |
| unsigned int color = 0; | |
| for (color = 0; color < 0x10000; color++) { | |
| r = ((color & 0xF800) >> 8) + ((color >> 13) & 0x07); | |
| g = ((color & 0x07E0) >> 3) + ((color >> 9) & 0x03); | |
| b = ((color & 0x001F) << 3) + ((color >> 2) & 0x07); | |
| y = ((263 * r) + (516 * g) + (100 * b) + 16384) >> 10; | |
| u = ((-152 * r) + (298 * g) + (450 * b) + 131072) >> 10; | |
| v = ((450 * r) + (377 * g) + (-73 * b) + 131072) >> 10; | |
| if (y > 235) y = 235; if (y < 16) y = 16; | |
| if (u > 235) u = 235; if (u < 16) u = 16; | |
| if (v > 235) v = 235; if (v < 16) v = 16; | |
| uyv_table[color] = (v << 16) + (y << 8) + u; | |
| } | |
| } | |
| void rgb565_to_uyvy(unsigned char *rbg565_buf, unsigned char *uyvy_buf, int x, int y, int w, int h, int stride) | |
| { | |
| register int i, j; | |
| unsigned short int *rgb565 = NULL; | |
| unsigned int *p = NULL; | |
| for (i = 0; i < h; i++) { | |
| rgb565 = (unsigned short int *) rbg565_buf + ((y + i) * stride + x); | |
| p = (unsigned int *) uyvy_buf + ((y + i) * stride + y) >> 1); | |
| for (j = 0; j < w; j+=2) { | |
| *p++ = (unsigned int)(uyv_table[*rgb565] & 0xFFFFFF) + (unsigned int) ((uyv_table[*(rgb565 + 1)] << 16) & 0x0FF000000); | |
| rgb565 += 2; | |
| } | |
| } | |
| } |
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