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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>
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@ -74,6 +74,43 @@ struct globals {
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#define DEBUG_MESSAGE(...) ((void)0)
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#define DEBUG_MESSAGE(...) ((void)0)
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#endif
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#endif
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/**
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* Configure palette for RGB:332
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*/
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static void fb_setpal(int fd)
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{
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struct fb_cmap cmap;
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/* fb colors are 16 bit */
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unsigned short red[256], green[256], blue[256];
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unsigned i;
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/* RGB:332 */
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for (i = 0; i < 256; i++) {
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/* Color is encoded in pixel value as rrrgggbb.
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* 3-bit color is mapped to 16-bit one as:
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* 000 -> 00000000 00000000
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* 001 -> 00100100 10010010
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* ...
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* 011 -> 01101101 10110110
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* 100 -> 10010010 01001001
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* ...
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* 111 -> 11111111 11111111
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*/
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red[i] = (( i >> 5 ) * 0x9249) >> 2; // rrr * 00 10010010 01001001 >> 2
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green[i] = (((i >> 2) & 0x7) * 0x9249) >> 2; // ggg * 00 10010010 01001001 >> 2
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/* 2-bit color is easier: */
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blue[i] = ( i & 0x3) * 0x5555; // bb * 01010101 01010101
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}
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cmap.start = 0;
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cmap.len = 256;
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cmap.red = red;
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cmap.green = green;
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cmap.blue = blue;
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cmap.transp = 0;
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xioctl(fd, FBIOPUTCMAP, &cmap);
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}
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/**
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/**
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* Open and initialize the framebuffer device
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* Open and initialize the framebuffer device
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@ -87,8 +124,21 @@ static void fb_open(const char *strfb_device)
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xioctl(fbfd, FBIOGET_VSCREENINFO, &G.scr_var);
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xioctl(fbfd, FBIOGET_VSCREENINFO, &G.scr_var);
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xioctl(fbfd, FBIOGET_FSCREENINFO, &G.scr_fix);
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xioctl(fbfd, FBIOGET_FSCREENINFO, &G.scr_fix);
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if (G.scr_var.bits_per_pixel < 16 || G.scr_var.bits_per_pixel > 32)
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switch (G.scr_var.bits_per_pixel) {
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case 8:
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fb_setpal(fbfd);
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break;
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case 16:
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case 24:
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case 32:
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break;
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default:
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bb_error_msg_and_die("unsupported %u bpp", (int)G.scr_var.bits_per_pixel);
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bb_error_msg_and_die("unsupported %u bpp", (int)G.scr_var.bits_per_pixel);
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break;
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}
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G.bytes_per_pixel = (G.scr_var.bits_per_pixel + 7) >> 3;
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G.bytes_per_pixel = (G.scr_var.bits_per_pixel + 7) >> 3;
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// map the device in memory
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// map the device in memory
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@ -109,11 +159,17 @@ static void fb_open(const char *strfb_device)
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*/
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*/
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static unsigned fb_pixel_value(unsigned r, unsigned g, unsigned b)
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static unsigned fb_pixel_value(unsigned r, unsigned g, unsigned b)
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{
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{
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if (G.bytes_per_pixel == 1) {
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r = r & 0xe0; // 3-bit red
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g = (g >> 3) & 0x1c; // 3-bit green
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b = b >> 6; // 2-bit blue
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return r + g + b;
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}
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if (G.bytes_per_pixel == 2) {
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if (G.bytes_per_pixel == 2) {
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r >>= 3; // 5-bit red
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r = (r & 0xf8) << 8; // 5-bit red
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g >>= 2; // 6-bit green
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g = (g & 0xfc) << 3; // 6-bit green
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b >>= 3; // 5-bit blue
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b = b >> 3; // 5-bit blue
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return b + (g << 5) + (r << (5+6));
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return r + g + b;
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}
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}
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// RGB 888
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// RGB 888
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return b + (g << 8) + (r << 16);
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return b + (g << 8) + (r << 16);
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@ -125,6 +181,9 @@ static unsigned fb_pixel_value(unsigned r, unsigned g, unsigned b)
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static void fb_write_pixel(unsigned char *addr, unsigned pixel)
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static void fb_write_pixel(unsigned char *addr, unsigned pixel)
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{
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{
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switch (G.bytes_per_pixel) {
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switch (G.bytes_per_pixel) {
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case 1:
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*addr = pixel;
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break;
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case 2:
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case 2:
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*(uint16_t *)addr = pixel;
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*(uint16_t *)addr = pixel;
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break;
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break;
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