patch-2.1.67 linux/drivers/video/fbcmap.c

• Lines: 324
• Date: Tue Sep 16 02:29:26 1997
• Orig file: v2.1.66/linux/drivers/video/fbcmap.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.66/linux/drivers/video/fbcmap.c linux/drivers/video/fbcmap.c
@@ -0,0 +1,323 @@
+/*
+ *  linux/drivers/video/fbcmap.c -- Colormap handling for frame buffer devices
+ *
+ *	Created 15 Jun 1997 by Geert Uytterhoeven
+ *
+ *  This file is subject to the terms and conditions of the GNU General Public
+ *  License.  See the file COPYING in the main directory of this archive for
+ *  more details.
+ */
+
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/fb.h>
+#include <linux/slab.h>
+
+#include <asm/uaccess.h>
+
+
+static void memcpy_fs(int fsfromto, void *to, void *from, int len)
+{
+    switch (fsfromto) {
+    	case 0:
+    	    memcpy(to, from, len);
+    	    return;
+    	case 1:
+    	    copy_from_user(to, from, len);
+    	    return;
+    	case 2:
+    	    copy_to_user(to, from, len);
+    	    return;
+    }
+}
+
+#define CNVT_TOHW(val,width)	((((val)<<(width))+0x7fff-(val))>>16)
+#define CNVT_FROMHW(val,width)	(((width) ? ((((val)<<16)-(val)) / \
+					((1<<(width))-1)) : 0))
+
+static u_short red2[] = {
+    0x0000, 0xaaaa
+};
+static u_short green2[] = {
+    0x0000, 0xaaaa
+};
+static u_short blue2[] = {
+    0x0000, 0xaaaa
+};                                                  
+ 
+static u_short red4[] = {
+    0x0000, 0xaaaa, 0x5555, 0xffff
+};
+static u_short green4[] = {
+    0x0000, 0xaaaa, 0x5555, 0xffff
+};
+static u_short blue4[] = {
+    0x0000, 0xaaaa, 0x5555, 0xffff
+};
+ 
+static u_short red8[] = {
+    0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa
+};
+static u_short green8[] = {
+    0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0xaaaa, 0xaaaa
+};
+static u_short blue8[] = {
+    0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa
+};
+ 
+static u_short red16[] = {
+    0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa,
+    0x5555, 0x5555, 0x5555, 0x5555, 0xffff, 0xffff, 0xffff, 0xffff
+};
+static u_short green16[] = {
+    0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0xaaaa, 0xaaaa,
+    0x5555, 0x5555, 0xffff, 0xffff, 0x5555, 0x5555, 0xffff, 0xffff
+};
+static u_short blue16[] = {
+    0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa,
+    0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff
+};
+
+static struct fb_cmap default_2_colors = {
+    0, 2, red2, green2, blue2, NULL
+};
+static struct fb_cmap default_8_colors = {
+    0, 8, red8, green8, blue8, NULL
+};                                  
+static struct fb_cmap default_4_colors = {
+    0, 4, red4, green4, blue4, NULL
+};             
+static struct fb_cmap default_16_colors = {
+    0, 16, red16, green16, blue16, NULL
+};
+
+
+    /*
+     *  Allocate a colormap
+     */
+
+int fb_alloc_cmap(struct fb_cmap *cmap, int len, int transp)
+{
+    int size = len*sizeof(u_short);
+		    
+    if (cmap->len != len) {
+	if (cmap->red)                                         
+	    kfree(cmap->red);
+	if (cmap->green)
+	    kfree(cmap->green);
+	if (cmap->blue)
+	    kfree(cmap->blue);
+	if (cmap->transp)
+	    kfree(cmap->transp);            
+	cmap->red = cmap->green = cmap->blue = cmap->transp = NULL;    
+	cmap->len = 0;                          
+	if (!len) 
+	    return 0;                                      
+	if (!(cmap->red = kmalloc(size, GFP_ATOMIC)))
+	    return -1;
+	if (!(cmap->green = kmalloc(size, GFP_ATOMIC)))                 
+	    return -1;
+	if (!(cmap->blue = kmalloc(size, GFP_ATOMIC)))
+	    return -1;                  
+	if (transp) {                            
+	    if (!(cmap->transp = kmalloc(size, GFP_ATOMIC)))
+		return -1;                                      
+	} else                  
+	    cmap->transp = NULL;                                    
+    }
+    cmap->start = 0;
+    cmap->len = len;
+    fb_copy_cmap(fb_default_cmap(len), cmap, 0);
+    return 0;
+}
+
+
+    /*
+     *  Copy a colormap
+     */
+
+void fb_copy_cmap(struct fb_cmap *from, struct fb_cmap *to, int fsfromto)
+{
+    int size;
+    int tooff = 0, fromoff = 0;
+
+    if (to->start > from->start)
+	fromoff = to->start-from->start;
+    else
+	tooff = from->start-to->start;
+    size = to->len-tooff;
+    if (size > from->len-fromoff)
+	size = from->len-fromoff;
+    if (size < 0)
+	return;
+    size *= sizeof(u_short);                         
+    memcpy_fs(fsfromto, to->red+tooff, from->red+fromoff, size);
+    memcpy_fs(fsfromto, to->green+tooff, from->green+fromoff, size);
+    memcpy_fs(fsfromto, to->blue+tooff, from->blue+fromoff, size);
+    if (from->transp && to->transp)
+	memcpy_fs(fsfromto, to->transp+tooff, from->transp+fromoff, size);                              
+}
+
+
+    /*
+     *  Get the colormap for a screen
+     */
+
+int fb_get_cmap(struct fb_cmap *cmap, struct fb_var_screeninfo *var, int kspc,
+    	    	int (*getcolreg)(u_int, u_int *, u_int *, u_int *, u_int *))
+{
+    int i, start;
+    u_short *red, *green, *blue, *transp;
+    u_int hred, hgreen, hblue, htransp;
+
+    red = cmap->red;
+    green = cmap->green;
+    blue = cmap->blue;
+    transp = cmap->transp;
+    start = cmap->start;
+    if (start < 0)
+	return -EINVAL;
+    for (i = 0; i < cmap->len; i++) {
+	if (getcolreg(start++, &hred, &hgreen, &hblue, &htransp))
+	    return 0;
+	hred = CNVT_FROMHW(hred, var->red.length);
+	hgreen = CNVT_FROMHW(hgreen, var->green.length);
+	hblue = CNVT_FROMHW(hblue, var->blue.length);
+	htransp = CNVT_FROMHW(htransp, var->transp.length);
+	if (kspc) {
+	    *red = hred;
+	    *green = hgreen;
+	    *blue = hblue;
+	    if (transp)
+		*transp = htransp;
+	} else {
+	    put_user(hred, red);
+	    put_user(hgreen, green);
+	    put_user(hblue, blue);
+	    if (transp)
+		put_user(htransp, transp);
+	}
+	red++;
+	green++;
+	blue++;
+	if (transp)
+	    transp++;
+    }
+    return 0;
+}
+
+
+    /*
+     *  Set the colormap for a screen
+     */
+
+int fb_set_cmap(struct fb_cmap *cmap, struct fb_var_screeninfo *var, int kspc,
+    	    	int (*setcolreg)(u_int, u_int, u_int, u_int, u_int))
+{
+    int i, start;
+    u_short *red, *green, *blue, *transp;
+    u_int hred, hgreen, hblue, htransp;
+
+    red = cmap->red;
+    green = cmap->green;
+    blue = cmap->blue;
+    transp = cmap->transp;
+    start = cmap->start;
+
+    if (start < 0)
+	return -EINVAL;
+    for (i = 0; i < cmap->len; i++) {
+	if (kspc) {
+	    hred = *red;
+	    hgreen = *green;
+	    hblue = *blue;
+	    htransp = transp ? *transp : 0;
+	} else {
+	    get_user(hred, red);
+	    get_user(hgreen, green);
+	    get_user(hblue, blue);
+	    if (transp)
+		get_user(htransp, transp);
+	    else
+		htransp = 0;
+	}
+	hred = CNVT_TOHW(hred, var->red.length);
+	hgreen = CNVT_TOHW(hgreen, var->green.length);
+	hblue = CNVT_TOHW(hblue, var->blue.length);
+	htransp = CNVT_TOHW(htransp, var->transp.length);
+	red++;
+	green++;
+	blue++;
+	if (transp)
+	    transp++;
+	if (setcolreg(start++, hred, hgreen, hblue, htransp))
+	    return 0;
+    }
+    return 0;
+}
+
+
+    /*
+     *  Get the default colormap for a specific screen depth
+     */
+
+struct fb_cmap *fb_default_cmap(int bpp)
+{
+    switch (bpp) {                                                          
+	case 1:                                                       
+	    return &default_2_colors;
+	    break;
+	case 2:                                            
+	    return &default_4_colors;                             
+	    break;                                   
+	case 3:
+	    return &default_8_colors;                              
+	    break;
+	default:
+	    return &default_16_colors;
+	    break;                                                  
+    }
+}
+
+
+    /*
+     *  Invert all default colormaps
+     */
+
+void fb_invert_cmaps(void)
+{
+    u_int i;
+
+    for (i = 0; i < 2; i++) {
+	red2[i] = ~red2[i];
+	green2[i] = ~green2[i];
+	blue2[i] = ~blue2[i];
+    }
+    for (i = 0; i < 4; i++) {
+	red4[i] = ~red4[i];
+	green4[i] = ~green4[i];
+	blue4[i] = ~blue4[i];
+    }
+    for (i = 0; i < 8; i++) {
+	red8[i] = ~red8[i];
+	green8[i] = ~green8[i];
+	blue8[i] = ~blue8[i];
+    }
+    for (i = 0; i < 16; i++) {
+	red16[i] = ~red16[i];
+	green16[i] = ~green16[i];
+	blue16[i] = ~blue16[i];
+    }
+}
+
+
+    /*
+     *  Visible symbols for modules
+     */
+
+EXPORT_SYMBOL(fb_alloc_cmap);
+EXPORT_SYMBOL(fb_copy_cmap);
+EXPORT_SYMBOL(fb_get_cmap);
+EXPORT_SYMBOL(fb_set_cmap);
+EXPORT_SYMBOL(fb_default_cmap);
+EXPORT_SYMBOL(fb_invert_cmaps);