drivers/video/fbdev/core/tileblit.c

Source file repositories/reference/linux-study-clean/drivers/video/fbdev/core/tileblit.c

File Facts

System
Linux kernel
Corpus path
drivers/video/fbdev/core/tileblit.c
Extension
.c
Size
4734 bytes
Lines
189
Domain
Driver Families
Bucket
drivers/video
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <linux/module.h>
#include <linux/string.h>
#include <linux/fb.h>
#include <linux/vt_kern.h>
#include <linux/console.h>
#include <asm/types.h>
#include "fbcon.h"

static void tile_bmove(struct vc_data *vc, struct fb_info *info, int sy,
		       int sx, int dy, int dx, int height, int width)
{
	struct fb_tilearea area;

	area.sx = sx;
	area.sy = sy;
	area.dx = dx;
	area.dy = dy;
	area.height = height;
	area.width = width;

	info->tileops->fb_tilecopy(info, &area);
}

static void tile_clear(struct vc_data *vc, struct fb_info *info, int sy,
		       int sx, int height, int width, int fg, int bg)
{
	struct fb_tilerect rect;

	rect.index = vc->vc_video_erase_char &
		((vc->vc_hi_font_mask) ? 0x1ff : 0xff);
	rect.fg = fg;
	rect.bg = bg;
	rect.sx = sx;
	rect.sy = sy;
	rect.width = width;
	rect.height = height;
	rect.rop = ROP_COPY;

	info->tileops->fb_tilefill(info, &rect);
}

static void tile_putcs(struct vc_data *vc, struct fb_info *info,
		       const unsigned short *s, int count, int yy, int xx,
		       int fg, int bg)
{
	struct fb_tileblit blit;
	unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
	int size = sizeof(u32) * count, i;

	blit.sx = xx;
	blit.sy = yy;
	blit.width = count;
	blit.height = 1;
	blit.fg = fg;
	blit.bg = bg;
	blit.length = count;
	blit.indices = (u32 *) fb_get_buffer_offset(info, &info->pixmap, size);
	for (i = 0; i < count; i++)
		blit.indices[i] = (u32)(scr_readw(s++) & charmask);

	info->tileops->fb_tileblit(info, &blit);
}

static void tile_clear_margins(struct vc_data *vc, struct fb_info *info,
			       int color, int bottom_only)
{
	unsigned int cw = vc->vc_font.width;
	unsigned int ch = vc->vc_font.height;
	unsigned int rw = info->var.xres - (vc->vc_cols*cw);
	unsigned int bh = info->var.yres - (vc->vc_rows*ch);
	unsigned int rs = info->var.xres - rw;
	unsigned int bs = info->var.yres - bh;
	unsigned int vwt = info->var.xres_virtual / cw;
	unsigned int vht = info->var.yres_virtual / ch;
	struct fb_tilerect rect;

	rect.index = vc->vc_video_erase_char &
		((vc->vc_hi_font_mask) ? 0x1ff : 0xff);
	rect.fg = color;
	rect.bg = color;

	if ((int) rw > 0 && !bottom_only) {
		rect.sx = (info->var.xoffset + rs + cw - 1) / cw;
		rect.sy = 0;
		rect.width = (rw + cw - 1) / cw;
		rect.height = vht;
		if (rect.width + rect.sx > vwt)
			rect.width = vwt - rect.sx;
		if (rect.sx < vwt)
			info->tileops->fb_tilefill(info, &rect);

Annotation

Implementation Notes