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| author | Peter Korsgaard | 2011-10-17 05:31:52 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2011-10-17 05:31:52 +0200 |
| commit | cd06e06eee3ef89e45b60d7122e5518995c7f65e (patch) | |
| tree | 27856d2e966353f4d332dcb609f81d348eb1415c /miscutils | |
| parent | e4fa7b7965fd574cff2a6a9b877522d613804a38 (diff) | |
| download | busybox-cd06e06eee3ef89e45b60d7122e5518995c7f65e.zip busybox-cd06e06eee3ef89e45b60d7122e5518995c7f65e.tar.gz | |
fbsplash: support 8bit mode
Fake truecolor support using a RGB:332 palette.
function old new delta
fb_setpal - 172 +172
fbsplash_main 920 953 +33
fb_pixel_value 50 80 +30
fb_write_pixel 47 51 +4
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 3/0 up/down: 239/0) Total: 239 bytes
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'miscutils')
| -rw-r--r-- | miscutils/fbsplash.c | 69 |
1 files changed, 64 insertions, 5 deletions
diff --git a/miscutils/fbsplash.c b/miscutils/fbsplash.c index bc9ac8f..04d583d 100644 --- a/miscutils/fbsplash.c +++ b/miscutils/fbsplash.c @@ -74,6 +74,43 @@ struct globals { #define DEBUG_MESSAGE(...) ((void)0) #endif +/** + * Configure palette for RGB:332 + */ +static void fb_setpal(int fd) +{ + struct fb_cmap cmap; + /* fb colors are 16 bit */ + unsigned short red[256], green[256], blue[256]; + unsigned i; + + /* RGB:332 */ + for (i = 0; i < 256; i++) { + /* Color is encoded in pixel value as rrrgggbb. + * 3-bit color is mapped to 16-bit one as: + * 000 -> 00000000 00000000 + * 001 -> 00100100 10010010 + * ... + * 011 -> 01101101 10110110 + * 100 -> 10010010 01001001 + * ... + * 111 -> 11111111 11111111 + */ + red[i] = (( i >> 5 ) * 0x9249) >> 2; // rrr * 00 10010010 01001001 >> 2 + green[i] = (((i >> 2) & 0x7) * 0x9249) >> 2; // ggg * 00 10010010 01001001 >> 2 + /* 2-bit color is easier: */ + blue[i] = ( i & 0x3) * 0x5555; // bb * 01010101 01010101 + } + + cmap.start = 0; + cmap.len = 256; + cmap.red = red; + cmap.green = green; + cmap.blue = blue; + cmap.transp = 0; + + xioctl(fd, FBIOPUTCMAP, &cmap); +} /** * Open and initialize the framebuffer device @@ -87,8 +124,21 @@ static void fb_open(const char *strfb_device) xioctl(fbfd, FBIOGET_VSCREENINFO, &G.scr_var); xioctl(fbfd, FBIOGET_FSCREENINFO, &G.scr_fix); - if (G.scr_var.bits_per_pixel < 16 || G.scr_var.bits_per_pixel > 32) + switch (G.scr_var.bits_per_pixel) { + case 8: + fb_setpal(fbfd); + break; + + case 16: + case 24: + case 32: + break; + + default: bb_error_msg_and_die("unsupported %u bpp", (int)G.scr_var.bits_per_pixel); + break; + } + G.bytes_per_pixel = (G.scr_var.bits_per_pixel + 7) >> 3; // map the device in memory @@ -109,11 +159,17 @@ static void fb_open(const char *strfb_device) */ static unsigned fb_pixel_value(unsigned r, unsigned g, unsigned b) { + if (G.bytes_per_pixel == 1) { + r = r & 0xe0; // 3-bit red + g = (g >> 3) & 0x1c; // 3-bit green + b = b >> 6; // 2-bit blue + return r + g + b; + } if (G.bytes_per_pixel == 2) { - r >>= 3; // 5-bit red - g >>= 2; // 6-bit green - b >>= 3; // 5-bit blue - return b + (g << 5) + (r << (5+6)); + r = (r & 0xf8) << 8; // 5-bit red + g = (g & 0xfc) << 3; // 6-bit green + b = b >> 3; // 5-bit blue + return r + g + b; } // RGB 888 return b + (g << 8) + (r << 16); @@ -125,6 +181,9 @@ static unsigned fb_pixel_value(unsigned r, unsigned g, unsigned b) static void fb_write_pixel(unsigned char *addr, unsigned pixel) { switch (G.bytes_per_pixel) { + case 1: + *addr = pixel; + break; case 2: *(uint16_t *)addr = pixel; break; |