fbsplash: support configurable image position

For some setups (E.G. for supporting different screen resolutions),
positioning the image somewhere else than the top left corner may be
interesting.

Add support for IMG_LEFT/IMG_TOP settings to specify the image location,
similar to how it is done for the progress bar.

function                                             old     new   delta
fbsplash_main                                        994    1038     +44
static.param_names                                    57      74     +17
packed_usage                                       32631   32647     +16
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/0 up/down: 77/0)               Total: 77 bytes

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 12 insertions, 9 deletions

diff --git a/miscutils/fbsplash.c b/miscutils/fbsplash.c
index 5b2e5ac56..bc3c61055 100644
--- a/miscutils/fbsplash.c
+++ b/miscutils/fbsplash.c
@@ -54,7 +54,7 @@
 //usage:     "\n        -d      Framebuffer device (default /dev/fb0)"
 //usage:     "\n        -i      Config file (var=value):"
 //usage:     "\n                        BAR_LEFT,BAR_TOP,BAR_WIDTH,BAR_HEIGHT"
-//usage:     "\n                        BAR_R,BAR_G,BAR_B"
+//usage:     "\n                        BAR_R,BAR_G,BAR_B,IMG_LEFT,IMG_TOP"
 //usage:     "\n        -f      Control pipe (else exit after drawing image)"
 //usage:     "\n                        commands: 'NN' (% for progress bar) or 'exit'"
 
@@ -73,7 +73,7 @@ struct globals {
         FILE *logfile_fd;       // log file
 #endif
         unsigned char *addr;    // pointer to framebuffer memory
-        unsigned ns[7];         // n-parameters
+        unsigned ns[9];         // n-parameters
         const char *image_filename;
         struct fb_var_screeninfo scr_var;
         struct fb_fix_screeninfo scr_fix;
@@ -95,6 +95,8 @@ struct globals {
 #define nbar_colr       ns[4]   // progress bar color red component
 #define nbar_colg       ns[5]   // progress bar color green component
 #define nbar_colb       ns[6]   // progress bar color blue component
+#define img_posx        ns[7]   // image horizontal position
+#define img_posy        ns[8]   // image vertical position
 
 #if DEBUG
 #define DEBUG_MESSAGE(strMessage, args...) \
@@ -426,10 +428,10 @@ static void fb_drawimage(void)
         line_size = width*3;
         pixline = xmalloc(line_size);
 
-        if (width > G.scr_var.xres)
-                width = G.scr_var.xres;
-        if (height > G.scr_var.yres)
-                height = G.scr_var.yres;
+        if ((width + G.img_posx) > G.scr_var.xres)
+                width = G.scr_var.xres - G.img_posx;
+        if ((height + G.img_posy) > G.scr_var.yres)
+                height = G.scr_var.yres - G.img_posy;
         for (j = 0; j < height; j++) {
                 unsigned char *pixel;
                 unsigned char *src;
@@ -437,7 +439,7 @@ static void fb_drawimage(void)
                 if (fread(pixline, 1, line_size, theme_file) != line_size)
                         bb_error_msg_and_die("bad PPM file '%s'", G.image_filename);
                 pixel = pixline;
-                src = G.addr + j * G.scr_fix.line_length;
+                src = G.addr + (G.img_posy + j) * G.scr_fix.line_length + G.img_posx * G.bytes_per_pixel;
                 for (i = 0; i < width; i++) {
                         unsigned thispix = fb_pixel_value(pixel[0], pixel[1], pixel[2]);
                         fb_write_pixel(src, thispix);
@@ -460,6 +462,7 @@ static void init(const char *cfg_filename)
                 "BAR_WIDTH\0" "BAR_HEIGHT\0"
                 "BAR_LEFT\0" "BAR_TOP\0"
                 "BAR_R\0" "BAR_G\0" "BAR_B\0"
+                "IMG_LEFT\0" "IMG_TOP\0"
 #if DEBUG
                 "DEBUG\0"
 #endif
@@ -472,10 +475,10 @@ static void init(const char *cfg_filename)
                 int i = index_in_strings(param_names, token[0]);
                 if (i < 0)
                         bb_error_msg_and_die("syntax error: %s", token[0]);
-                if (i >= 0 && i < 7)
+                if (i >= 0 && i < 9)
                         G.ns[i] = val;
 #if DEBUG
-                if (i == 7) {
+                if (i == 9) {
                         G.bdebug_messages = val;
                         if (G.bdebug_messages)
                                 G.logfile_fd = xfopen_for_write("/tmp/fbsplash.log");