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author | Peter Korsgaard <jacmet@sunsite.dk> | 2011-10-17 05:31:52 +0200 |
---|---|---|
committer | Denys Vlasenko <vda.linux@googlemail.com> | 2011-10-17 05:31:52 +0200 |
commit | cd06e06eee3ef89e45b60d7122e5518995c7f65e (patch) | |
tree | 27856d2e966353f4d332dcb609f81d348eb1415c | |
parent | e4fa7b7965fd574cff2a6a9b877522d613804a38 (diff) | |
download | busybox-w32-cd06e06eee3ef89e45b60d7122e5518995c7f65e.tar.gz busybox-w32-cd06e06eee3ef89e45b60d7122e5518995c7f65e.tar.bz2 busybox-w32-cd06e06eee3ef89e45b60d7122e5518995c7f65e.zip |
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>
-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 bc9ac8fe1..04d583df6 100644 --- a/miscutils/fbsplash.c +++ b/miscutils/fbsplash.c | |||
@@ -74,6 +74,43 @@ struct globals { | |||
74 | #define DEBUG_MESSAGE(...) ((void)0) | 74 | #define DEBUG_MESSAGE(...) ((void)0) |
75 | #endif | 75 | #endif |
76 | 76 | ||
77 | /** | ||
78 | * Configure palette for RGB:332 | ||
79 | */ | ||
80 | static void fb_setpal(int fd) | ||
81 | { | ||
82 | struct fb_cmap cmap; | ||
83 | /* fb colors are 16 bit */ | ||
84 | unsigned short red[256], green[256], blue[256]; | ||
85 | unsigned i; | ||
86 | |||
87 | /* RGB:332 */ | ||
88 | for (i = 0; i < 256; i++) { | ||
89 | /* Color is encoded in pixel value as rrrgggbb. | ||
90 | * 3-bit color is mapped to 16-bit one as: | ||
91 | * 000 -> 00000000 00000000 | ||
92 | * 001 -> 00100100 10010010 | ||
93 | * ... | ||
94 | * 011 -> 01101101 10110110 | ||
95 | * 100 -> 10010010 01001001 | ||
96 | * ... | ||
97 | * 111 -> 11111111 11111111 | ||
98 | */ | ||
99 | red[i] = (( i >> 5 ) * 0x9249) >> 2; // rrr * 00 10010010 01001001 >> 2 | ||
100 | green[i] = (((i >> 2) & 0x7) * 0x9249) >> 2; // ggg * 00 10010010 01001001 >> 2 | ||
101 | /* 2-bit color is easier: */ | ||
102 | blue[i] = ( i & 0x3) * 0x5555; // bb * 01010101 01010101 | ||
103 | } | ||
104 | |||
105 | cmap.start = 0; | ||
106 | cmap.len = 256; | ||
107 | cmap.red = red; | ||
108 | cmap.green = green; | ||
109 | cmap.blue = blue; | ||
110 | cmap.transp = 0; | ||
111 | |||
112 | xioctl(fd, FBIOPUTCMAP, &cmap); | ||
113 | } | ||
77 | 114 | ||
78 | /** | 115 | /** |
79 | * Open and initialize the framebuffer device | 116 | * Open and initialize the framebuffer device |
@@ -87,8 +124,21 @@ static void fb_open(const char *strfb_device) | |||
87 | xioctl(fbfd, FBIOGET_VSCREENINFO, &G.scr_var); | 124 | xioctl(fbfd, FBIOGET_VSCREENINFO, &G.scr_var); |
88 | xioctl(fbfd, FBIOGET_FSCREENINFO, &G.scr_fix); | 125 | xioctl(fbfd, FBIOGET_FSCREENINFO, &G.scr_fix); |
89 | 126 | ||
90 | if (G.scr_var.bits_per_pixel < 16 || G.scr_var.bits_per_pixel > 32) | 127 | switch (G.scr_var.bits_per_pixel) { |
128 | case 8: | ||
129 | fb_setpal(fbfd); | ||
130 | break; | ||
131 | |||
132 | case 16: | ||
133 | case 24: | ||
134 | case 32: | ||
135 | break; | ||
136 | |||
137 | default: | ||
91 | bb_error_msg_and_die("unsupported %u bpp", (int)G.scr_var.bits_per_pixel); | 138 | bb_error_msg_and_die("unsupported %u bpp", (int)G.scr_var.bits_per_pixel); |
139 | break; | ||
140 | } | ||
141 | |||
92 | G.bytes_per_pixel = (G.scr_var.bits_per_pixel + 7) >> 3; | 142 | G.bytes_per_pixel = (G.scr_var.bits_per_pixel + 7) >> 3; |
93 | 143 | ||
94 | // map the device in memory | 144 | // map the device in memory |
@@ -109,11 +159,17 @@ static void fb_open(const char *strfb_device) | |||
109 | */ | 159 | */ |
110 | static unsigned fb_pixel_value(unsigned r, unsigned g, unsigned b) | 160 | static unsigned fb_pixel_value(unsigned r, unsigned g, unsigned b) |
111 | { | 161 | { |
162 | if (G.bytes_per_pixel == 1) { | ||
163 | r = r & 0xe0; // 3-bit red | ||
164 | g = (g >> 3) & 0x1c; // 3-bit green | ||
165 | b = b >> 6; // 2-bit blue | ||
166 | return r + g + b; | ||
167 | } | ||
112 | if (G.bytes_per_pixel == 2) { | 168 | if (G.bytes_per_pixel == 2) { |
113 | r >>= 3; // 5-bit red | 169 | r = (r & 0xf8) << 8; // 5-bit red |
114 | g >>= 2; // 6-bit green | 170 | g = (g & 0xfc) << 3; // 6-bit green |
115 | b >>= 3; // 5-bit blue | 171 | b = b >> 3; // 5-bit blue |
116 | return b + (g << 5) + (r << (5+6)); | 172 | return r + g + b; |
117 | } | 173 | } |
118 | // RGB 888 | 174 | // RGB 888 |
119 | return b + (g << 8) + (r << 16); | 175 | return b + (g << 8) + (r << 16); |
@@ -125,6 +181,9 @@ static unsigned fb_pixel_value(unsigned r, unsigned g, unsigned b) | |||
125 | static void fb_write_pixel(unsigned char *addr, unsigned pixel) | 181 | static void fb_write_pixel(unsigned char *addr, unsigned pixel) |
126 | { | 182 | { |
127 | switch (G.bytes_per_pixel) { | 183 | switch (G.bytes_per_pixel) { |
184 | case 1: | ||
185 | *addr = pixel; | ||
186 | break; | ||
128 | case 2: | 187 | case 2: |
129 | *(uint16_t *)addr = pixel; | 188 | *(uint16_t *)addr = pixel; |
130 | break; | 189 | break; |