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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/bug.h>
#include <linux/export.h>
#include <linux/string.h>
#include "font.h"
/**
* font_glyph_cursor - Create a cursor glyph
* @width: The glyph width in bits per scanline
* @height: The number of scanlines in the glyph
* @start: The first scanline of the cursor block
* @end: The first scanline after the cursor block
* @out: The cursor-glyph bitmap
*
* The parameters @width and @height refer to the glyph size. The caller
* has to provide the output buffer @out of sufficient size to hold the
* cursor glyph. The arguments in @start and @end describe the number of
* scanlines occupied by the cursor block; counting from the top of the
* glyph. The helper fills these scanlines with a pattern and clears the
* remaining scanlines.
*/
void font_glyph_cursor(unsigned int width, unsigned int height,
unsigned int start, unsigned int end, unsigned char *out)
{
unsigned int pitch = font_glyph_pitch(width);
const unsigned char *out_end = out + height * pitch;
unsigned int size;
if (WARN_ON_ONCE(start > height))
start = height;
if (WARN_ON_ONCE(end > height))
end = height;
if (end < start)
end = start;
/* clear scanlines before cursor block */
size = start * pitch;
memset(out, 0x00, size);
out += size;
/* set cursor block */
size = (end - start) * pitch;
memset(out, 0xff, size);
out += size;
/* clear scanlines below cursor block */
size = (height - end) * pitch;
memset(out, 0x00, size);
out += size;
WARN_ON_ONCE(out != out_end);
}
EXPORT_SYMBOL_GPL(font_glyph_cursor);
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